编程技巧20法(修订)
来源：互联网 发布：无锡华云数据cmo 编辑：程序博客网 时间：2024/04/29 18:17
1. 如何激活当前屏幕保护程序
// 激活当前屏幕保护程序, jingzhou xu
PostMessage(WM_SYSCOMMAND,SC_SCREENSAVE,0);
2. 如何禁止/启用屏幕保护及电源管理
static UINT dss_GetList[] = {SPI_GETLOWPOWERTIMEOUT, SPI_GETPOWEROFFTIMEOUT, SPI_GETSCREENSAVETIMEOUT};
static UINT dss_SetList[] = {SPI_SETLOWPOWERTIMEOUT, SPI_SETPOWEROFFTIMEOUT, SPI_SETSCREENSAVETIMEOUT};
static const int dss_ListCount = _countof(dss_GetList);
l 禁止屏幕保护及电源管理
{
m_pValue = new int[dss_ListCount];
for (int x=0;x<dss_ListCount;x++)
{
// 禁止屏幕保护及电源管理
VERIFY(SystemParametersInfo (dss_SetList[x], 0, NULL, 0));
}
delete[] m_pValue;
}
l 启用屏幕保护及电源管理
{
m_pValue = new int[dss_ListCount];
for (int x=0;x<dss_ListCount;x++)
{
//启用屏幕保护及电源管理
VERIFY(SystemParametersInfo (dss_SetList[x], m_pValue[x], NULL, 0));
}
delete[] m_pValue;
}
3. 如何激活和关闭IE浏览器
//激活并打开IE
void lounchIE()
{
HWND h=FindWindowEx(NULL,NULL,NULL,
"Microsoft Internet Explorer") ;
ShellExecute(h,"open","C://simple.html",
NULL,NULL,SW_SHOWNORMAL);
}
//关闭IE及其它应用
void CloseIE()
{
int app=BSM_APPLICATIONS;
unsigned long bsm_app=(unsigned long )app;
BroadcastSystemMessage(BSF_POSTMESSAGE,&bsm_app,
WM_CLOSE,NULL,NULL);
}
4. 如何给树控件加入工具提示
l 首先给树控件加入TVS_INFOTIP属性风格，如下所示：
if (!m_ctrlTree.Create(WS_CHILD|WS_VISIBLE|
TVS_HASLINES|TVS_HASBUTTONS|TVS_LINESATROOT|TVS_SHOWSELALWAYS|TVS_INFOTIP, //加入提示TVS_INFOTIP，jingzhou xu(树控件ID:100)
CRect(0, 0, 0, 0), &m_wndTreeBar, 100))
{
TRACE0("Failed to create instant bar child/n");
return -1;
}
l 其次加入映射消息声明，如下所示:
afx_msg void OnGetInfoTip(NMHDR* pNMHDR,LRESULT* pResult); //树控件上加入提示消息，jingzhou xu
ON_NOTIFY(TVN_GETINFOTIP, 100, OnGetInfoTip) //树控件条目上加入提示，jingzhou xu
l 最后加入呼应涵数处理：
void CCreateTreeDlg::OnGetInfoTip(NMHDR* pNMHDR,
LRESULT* pResult)
{
*pResult = 0;
NMTVGETINFOTIP* pTVTipInfo = (NMTVGETINFOTIP*)pNMHDR;
LPARAM itemData = (DWORD) pTVTipInfo->lParam;
//对应每个条目的数据
HTREEITEM hItem = pTVTipInfo->hItem;
CString tip;
HTREEITEM hRootItem = m_chassisTree.GetRootItem();
if (hRootItem != pTVTipInfo->hItem)
{
tip = "树结点的提示";
}
else
{
tip = "树根上的提示";
}
strcpy(pTVTipInfo->pszText, (LPCTSTR) tip);
}
5. 如何获取系统信息框的路径
#include <atlbase.h>
#define IDS_REG_KEY_MSINFO_PATH1 _T( "Software//Microsoft//Shared Tools//MSInfo" )
#define IDS_REG_KEY_MSINFO_PATH2 _T( "Software//Microsoft//Shared Tools Location" )
#define IDS_REG_VAL_MSINFO_PATH1 _T( "Path" )
#define IDS_REG_VAL_MSINFO_PATH2 _T( "MSInfo" )
#define IDS_MSINFO_EXE_NAME _T( "MSInfo32.exe" )
//...
BOOL GetSysInfoPath( CString& strPath )
{
strPath.Empty();
LPTSTR pszPath = strPath.GetBuffer( MAX_PATH );
CRegKey reg;
DWORD dwSize = MAX_PATH;
LONG nRet = reg.Open( HKEY_LOCAL_MACHINE, IDS_REG_KEY_MSINFO_PATH1, KEY_READ );
// 在注册表中寻找第一个"MSInfo32.exe" 位置
if ( nRet == ERROR_SUCCESS )
{
#if ( _MFC_VER >= 0x0700 )
nRet = reg.QueryStringValue( IDS_REG_VAL_MSINFO_PATH1, pszPath, &dwSize );
#else
nRet = reg.QueryValue( pszPath, IDS_REG_VAL_MSINFO_PATH1, &dwSize );
#endif
reg.Close();
}
// 如果第一次寻找失败，则进行第二次寻找
if ( nRet != ERROR_SUCCESS )
{
nRet = reg.Open( HKEY_LOCAL_MACHINE, IDS_REG_KEY_MSINFO_PATH2, KEY_READ );
if ( nRet == ERROR_SUCCESS )
{
#if ( _MFC_VER >= 0x0700 )
reg.QueryStringValue( IDS_REG_VAL_MSINFO_PATH2, pszPath, &dwSize );
#else
reg.QueryValue( pszPath, IDS_REG_VAL_MSINFO_PATH2, &dwSize );
#endif
// 路径名不包括EXE文件名
if ( nRet == ERROR_SUCCESS )
VERIFY( ::PathAppend( pszPath, IDS_MSINFO_EXE_NAME ) );
reg.Close();
}
}
strPath.ReleaseBuffer();
strPath.FreeExtra();
// 检查文件是否有效.
return ::PathFileExists( strPath );
}
6. 如何直接运行一个资源中的程序
bool Run()
{
CFile f;
char* pFileName = "Execution.exe";
if( !f.Open( pFileName, CFile::modeCreate | CFile::modeWrite, NULL ) )
{
AfxMessageBox("Can not create file!");
return 0;
}
CString path = f.GetFilePath();
HGLOBAL hRes;
HRSRC hResInfo;
//获取应用实例
HINSTANCE insApp = AfxGetInstanceHandle();
//寻找EXE资源名
hResInfo = FindResource(insApp,(LPCSTR)IDR_EXE4,"EXE");
hRes = LoadResource(insApp,hResInfo ); // Load it
DWORD dFileLength = SizeofResource( insApp, hResInfo ); //计算EXE文件大小
f.WriteHuge((LPSTR)hRes,dFileLength); //写入临时文件
f.Close();
HINSTANCE HINSsd = ShellExecute(NULL, "open",path, NULL, NULL, SW_SHOWNORMAL);> //运行它.
return 1;
}
7. 如何遍历整个目录
#include <windows.h>
#include <shlobj.h>
//浏览目录.
void BrowseFolder( void )
{
TCHAR path[MAX_PATH];
BROWSEINFO bi = { 0 };
bi.lpszTitle = ("递归调用所有目录");
LPITEMIDLIST pidl = SHBrowseForFolder ( &bi );
if ( pidl != 0 )
{
// 获取目录路径
SHGetPathFromIDList ( pidl, path );
//设置为当前路径
SetCurrentDirectory ( path );
//搜索所有子目录
SearchFolder( path );
// 释放内存
IMalloc * imalloc = 0;
if ( SUCCEEDED( SHGetMalloc ( &imalloc )) )
{
imalloc->Free ( pidl );
imalloc->Release ( );
}
}
//搜索其下所有子目录及文件.
void SearchFolder( TCHAR * path )
{
WIN32_FIND_DATA FindFileData;
HANDLE hFind;
TCHAR filename[ MAX_PATH + 256 ];
TCHAR pathbak[ MAX_PATH ];
//复制初始用户选择目录
strcpy( pathbak, path );
//寻找第一个文件
hFind = FindFirstFile ( "*.*", &FindFileData );
//搜索所有文件及子目录
do
{
if ( hFind != INVALID_HANDLE_VALUE )
{
//如果是当前目录或父目录，跳过
if ( ! ( strcmp( FindFileData.cFileName, "." ) ) || ! ( strcmp( FindFileData.cFileName, ".." ) ) )
{
continue;
}
//恢复初始用户选择目录
strcpy( path, pathbak );
//列出所有发现的文件
sprintf( path, "%s//%s", path, FindFileData.cFileName );
//如果 SetCurrentDirectory 成功的话，则它是一个目录，递归调用继续搜索子目录
if ( ( SetCurrentDirectory( path ) ) )
{
SearchFolder( path );
}
//插入文件及路径名到列表框m_listbox_hwnd中
SendMessage( m_listbox_hwnd, LB_ADDSTRING, 0, path ); //<--INSERT WHAT YOU WANT DONE HERE!
}
}
while ( FindNextFile ( hFind, &FindFileData ) && hFind != INVALID_HANDLE_VALUE );
FindClose ( hFind );
}
8. 如何禁止/启用系统热键
bool bOld;
l 禁止系统热键
//屏蔽掉系统键
SystemParametersInfo(SPI_SETSCREENSAVERRUNNING,true,&bOld,SPIF_UPDATEINIFILE);
l 启用系统热键
//恢复系统热键
SystemParametersInfo(SPI_SETSCREENSAVERRUNNING,false,&bOld,SPIF_UPDATEINIFILE);
9. 如何隐藏/显示WINDOWS系统任务栏
l 隐藏系统任务栏
//隐藏WINDOWS系统任务栏
::ShowWindow (::FindWindow("Shell_TrayWnd",NULL),SW_HIDE);
l 显示系统任务栏
//恢复WINDOWS系统任务栏正常显示
::ShowWindow (::FindWindow("Shell_TrayWnd",NULL),SW_SHOW);
10. 如何实现窗口到系统区图标间的动画效果
//********************************************************************************
//* 名称：FindTrayWnd
//* 作者：徐景周(jingzhou_xu@163.net)
//* 功能：在显示窗体动画效果前，先寻找系统区位置
//********************************************************************************
BOOL CALLBACK FindTrayWnd(HWND hwnd, LPARAM lParam)
{
TCHAR szClassName[256];
GetClassName(hwnd, szClassName, 255);
// 比较窗口类名
if (_tcscmp(szClassName, _T("TrayNotifyWnd")) == 0)
{
CRect *pRect = (CRect*) lParam;
::GetWindowRect(hwnd, pRect);
return TRUE;
}
// 当找到时钟窗口时表示可以结束了
if (_tcscmp(szClassName, _T("TrayClockWClass")) == 0)
{
CRect *pRect = (CRect*) lParam;
CRect rectClock;
::GetWindowRect(hwnd, rectClock);
pRect->right = rectClock.left;
return FALSE;
}
return TRUE;
}
//********************************************************************************
//* 名称：WinAnimation
//* 作者：徐景周(jingzhou_xu@163.net)
//* 功能：显示窗口动画效果的涵数
//********************************************************************************
void CScreenSnapDlg::WinAnimation(BOOL ShowFlag)
{
CRect rect(0,0,0,0);
// 查找托盘窗口
CWnd* pWnd = FindWindow("Shell_TrayWnd", NULL);
if (pWnd)
{
pWnd->GetWindowRect(rect);
EnumChildWindows(pWnd->m_hWnd, FindTrayWnd, (LPARAM)&rect);
//rect 为托盘区矩形
CRect rcWnd;
GetWindowRect(rcWnd);
if(ShowFlag) //窗体滑向系统区
DrawAnimatedRects(GetSafeHwnd(),IDANI_CAPTION,rcWnd,rect);
else //窗体从系统区滑出
DrawAnimatedRects(GetSafeHwnd(),IDANI_CAPTION,rect,rcWnd);
}
}
用法如下：
if(IsWindowVisible()) //窗体是否已隐藏
{
ShowWindow(SW_HIDE); //先隐藏窗体
WinAnimation(true); //窗体动画滑入到系统区中
}
else
{
WinAnimation(false); //窗体动画从系统区滑出
ShowWindow(SW_SHOW);
}
11. 如何判断当前操作系统的版本
//------------------------------------------------------------------------------------------------
//判断操作系统涵数及变量，jingzhou xu
typedef enum tagWin32SysType{
Windows32s,
WindowsNT3,
Windows95,
Windows98,
WindowsME,
WindowsNT4,
Windows2000,
WindowsXP
}Win32SysType;
//判断操作系统涵数及变量，jingzhou xu
Win32SysType IsShellSysType()
{
Win32SysType ShellType;
DWORD winVer;
OSVERSIONINFO *osvi;
winVer=GetVersion();
if(winVer<0x80000000){/*NT */
ShellType=WindowsNT3;
osvi= (OSVERSIONINFO *)malloc(sizeof(OSVERSIONINFO));
if (osvi!=NULL){
memset(osvi,0,sizeof(OSVERSIONINFO));
osvi->dwOSVersionInfoSize=sizeof(OSVERSIONINFO);
GetVersionEx(osvi);
if(osvi->dwMajorVersion==4L)ShellType=WindowsNT4;
else if(osvi->dwMajorVersion==5L&&osvi->dwMinorVersion==0L)ShellType=Windows2000;
else if(osvi->dwMajorVersion==5L&&osvi->dwMinorVersion==1L)ShellType=WindowsXP;
free(osvi);
}
}
else if (LOBYTE(LOWORD(winVer))<4)
ShellType=Windows32s;
else{
ShellType=Windows95;
osvi= (OSVERSIONINFO *)malloc(sizeof(OSVERSIONINFO));
if (osvi!=NULL){
memset(osvi,0,sizeof(OSVERSIONINFO));
osvi->dwOSVersionInfoSize=sizeof(OSVERSIONINFO);
GetVersionEx(osvi);
if(osvi->dwMajorVersion==4L&&osvi->dwMinorVersion==10L)ShellType=Windows98;
else if(osvi->dwMajorVersion==4L&&osvi->dwMinorVersion==90L)ShellType=WindowsME;
free(osvi);
}
}
return ShellType;
}
//------------------------------------------------------------------------------------------------
12. 如何在指定矩形框内水平/垂直显示多行文字
///////////////////////////////////////////////////////
//说明：
// 在矩形框中水平或垂直显示多行文字，jingzhou xu.
// lMode: 排列方式，0:水平方式; 1:垂直对齐
// lHori: 水平对齐方式, 0:左对齐; 1:居中; 2:右对齐; 3：自定义
// lVert: 垂直对齐方式, 0:顶对齐; 1:居中; 2:底对齐; 3：自定义
///////////////////////////////////////////////////////
CRect DrawTitleInRect(CDC *pDC, CString szString, LPRECT lpRect, long lMode, long lHori, long lVert)
{
TEXTMETRIC tm;
pDC->GetTextMetrics(&tm);
int tmpWidth=tm.tmAveCharWidth, tmpHeight=tm.tmHeight;
CRect rcInner(lpRect);
if(lMode==0)
{
rcInner.left+=tmpWidth;
rcInner.right-=tmpWidth;
rcInner.top-=tmpWidth;
rcInner.bottom+=tmpWidth;
}
if(lMode==1)
{
rcInner.left+=tmpWidth;
rcInner.right=rcInner.left+tmpWidth;
rcInner.top-=tmpWidth;
rcInner.bottom+=tmpWidth;
}
pDC->DrawText(szString, rcInner,DT_CALCRECT);
switch(lHori)
{
case 0:
break;
case 1:
{
long xOutCent=(lpRect->right+lpRect->left)/2;
long xInnCent=(rcInner.right+rcInner.left)/2;
rcInner.left+=(xOutCent-xInnCent);
rcInner.right+=(xOutCent-xInnCent);
}
break;
case 2:
{
long lInWidth=rcInner.right-rcInner.left;
rcInner.right=lpRect->right-tmpWidth;
rcInner.left=rcInner.right-lInWidth;
}
break;
default:
break;
}
switch(lVert)
{
case 0:
break;
case 1:
{
long yOutCent=(lpRect->bottom+lpRect->top)/2;
long yInnCent=(rcInner.bottom+rcInner.top)/2;
rcInner.top-=(yInnCent-yOutCent);
rcInner.bottom-=(yInnCent-yOutCent);
}
break;
case 2:
{
long lInHeigh=rcInner.top-rcInner.bottom;
rcInner.bottom=lpRect->bottom+tmpWidth;
rcInner.top=rcInner.bottom+lInHeigh;
}
break;
default:
break;
}
//---------------------------------------------------------------------------------------------
//功能：根据新、老矩形，重新计算行数，使文字多行显示,jingzhou xu
//---------------------------------------------------------------------------------------------
//一行中最大字符数
int nMaxLineChar = abs(lpRect->right - lpRect->left) / tmpWidth ;
//记录当前行的宽度
short theLineLength=0;
//记录当前行中汉字字节数，以防止将一半汉字分为两行
unsigned short halfChinese=0;
for(int i=0; i<=szString.GetLength()-1; i++)
{
if(((unsigned char)szString.GetAt(i) == 0x0d) && ((unsigned char)szString.GetAt(i+1) == 0x0a))
theLineLength=0;
//大于0xa1的字节为汉字字节
if((unsigned char)szString.GetAt(i) >= 0xA1)
halfChinese++;
theLineLength++;
//如果行宽大于每行最大宽度，进行特殊处理
if(theLineLength > nMaxLineChar)
{
//防止将一个汉字分为两行，回溯
if(halfChinese%2)
{
szString.Insert(i,(unsigned char)0x0a);
szString.Insert(i,(unsigned char)0x0d);
}
else
{
szString.Insert(i-1,(unsigned char)0x0a);
szString.Insert(i-1,(unsigned char)0x0d);
}
theLineLength = 0;
}
}
//重新计算矩形边界范围
// int tmpLine = int(abs(szString.GetLength()*tmpWidth / abs(lpRect->right - lpRect->left)-0.5));
// tmpLine += (szString.GetLength()*tmpWidth % abs(lpRect->right - lpRect->left))? 1 : 0;
// if(tmpLine == 0)
// tmpLine = 1;
if(rcInner.bottom > lpRect->bottom)
rcInner.bottom = lpRect->bottom;
if(rcInner.top < lpRect->top)
rcInner.top = lpRect->top;
//---------------------------------------------------------------------------------------------
if(lHori==0)
pDC->DrawText(szString, rcInner, DT_WORDBREAK|DT_LEFT);
else if(lHori==1)
pDC->DrawText(szString, rcInner, DT_WORDBREAK|DT_CENTER);
else if(lHori==2)
pDC->DrawText(szString, rcInner, DT_WORDBREAK|DT_RIGHT);
return rcInner;
}
13. 如何在指定矩形中旋转显示文字
///////////////////////////////////////////////////////
//说明：
// 在矩形框中旋转方式显示文字，jingzhou xu
//参数：
// pDC: DC指针
// str: 显示文字
// rect: 显示范围
// angle: 旋转角度
// nOptions: ExtTextOut()中相应设置<ETO_CLIPPED 和 ETO_OPAQUE>
///////////////////////////////////////////////////////
void DrawRotatedText(CDC* pDC, const CString str, CRect rect,
double angle, UINT nOptions)
{
//按比例转换角度值
double pi = 3.141592654;
double radian = pi * 2 / 360 * angle;
//获取显示文字中心点
CSize TextSize = pDC->GetTextExtent(str);
CPoint center;
center.x = TextSize.cx / 2;
center.y = TextSize.cy / 2;
//计算显示文字新的中心点
CPoint rcenter;
rcenter.x = long(cos(radian) * center.x - sin(radian) * center.y);
rcenter.y = long(sin(radian) * center.x + cos(radian) * center.y);
//绘制文字
pDC->SetTextAlign(TA_BASELINE);
pDC->SetBkMode(TRANSPARENT);
pDC->ExtTextOut(rect.left + rect.Width() / 2 - rcenter.x,
rect.top + rect.Height() / 2 + rcenter.y,
nOptions, rect, str, NULL);
}
14. 如何将32 x 32像素图标转换为16 x 16像素值的图标
HICON Convert32x32IconTo16x16(HICON h32x32Icon)
{
HDC hMainDC, hMemDC1, hMemDC2;
HICON h16x16Icon;
BITMAP bmp;
HBITMAP hOldBmp1, hOldBmp2;
ICONINFO IconInfo32x32, IconInfo16x16;
GetIconInfo(h32x32Icon, &IconInfo32x32);
hMainDC = ::GetDC(m_hWnd);
hMemDC1 = CreateCompatibleDC(hMainDC);
hMemDC2 = CreateCompatibleDC(hMainDC);
GetObject(IconInfo32x32.hbmColor, sizeof(BITMAP), &bmp);
IconInfo16x16.hbmColor = CreateBitmap( 16, 16,
bmp.bmPlanes,
bmp.bmBitsPixel,
NULL);
hOldBmp1 = (HBITMAP) SelectObject( hMemDC1,
IconInfo32x32.hbmColor);
hOldBmp2 = (HBITMAP) SelectObject( hMemDC2,
IconInfo16x16.hbmColor);
StretchBlt(hMemDC2,
0, 0,
16, 16,
hMemDC1,
0, 0,
32, 32,
SRCCOPY
);
GetObject(IconInfo32x32.hbmMask, sizeof(BITMAP), &bmp);
IconInfo16x16.hbmMask = CreateBitmap( 16, 16,
bmp.bmPlanes,
bmp.bmBitsPixel,
NULL);
SelectObject(hMemDC1, IconInfo32x32.hbmMask);
SelectObject(hMemDC2, IconInfo16x16.hbmMask);
StretchBlt(hMemDC2,
0, 0,
16, 16,
hMemDC1,
0, 0,
32, 32,
SRCCOPY
);
SelectObject(hMemDC1, hOldBmp1);
SelectObject(hMemDC2, hOldBmp2);
IconInfo16x16.fIcon = TRUE;
h16x16Icon = CreateIconIndirect(&IconInfo16x16);
DeleteObject(IconInfo32x32.hbmColor);
DeleteObject(IconInfo16x16.hbmColor);
DeleteObject(IconInfo32x32.hbmMask);
DeleteObject(IconInfo16x16.hbmMask);
DeleteDC(hMemDC1);
DeleteDC(hMemDC2);
::ReleaseDC(m_hWnd, hMainDC);
return h16x16Icon;
}
15. 如何建立一个灰度级图标
HICON CreateGrayscaleIcon(HICON hIcon)
{
HICON hGrayIcon = NULL;
HDC hMainDC = NULL,
hMemDC1 = NULL,
hMemDC2 = NULL;
BITMAP bmp;
HBITMAP hOldBmp1 = NULL,
hOldBmp2 = NULL;
ICONINFO csII, csGrayII;
BOOL bRetValue = FALSE;
bRetValue = ::GetIconInfo(hIcon, &csII);
if (bRetValue == FALSE) return NULL;
hMainDC = ::GetDC(m_hWnd);
hMemDC1 = ::CreateCompatibleDC(hMainDC);
hMemDC2 = ::CreateCompatibleDC(hMainDC);
if (hMainDC == NULL ||
hMemDC1 == NULL ||
hMemDC2 == NULL)
return NULL;
if (::GetObject(csII.hbmColor,
sizeof(BITMAP), &
amp;bmp))
{
csGrayII.hbmColor =
::CreateBitmap(csII.xHotspot*2,
csII.yHotspot*2,
bmp.bmPlanes,
bmp.bmBitsPixel,
NULL);
if (csGrayII.hbmColor)
{
hOldBmp1 =
(HBITMAP)::SelectObject(hMemDC1,
csII.hbmColor);
hOldBmp2 =
(HBITMAP)::SelectObject(hMemDC2,
csGrayII.hbmColor);
::BitBlt(hMemDC2, 0, 0, csII.xHotspot*2,
csII.yHotspot*2, hMemDC1, 0, 0,
SRCCOPY);
DWORD dwLoopY = 0, dwLoopX = 0;
COLORREF crPixel = 0;
BYTE byNewPixel = 0;
for (dwLoopY = 0; dwLoopY < csII.yHotspot*2; dwLoopY++)
{
for (dwLoopX = 0; dwLoopX < csII.xHotspot*2; dwLoopX++)
{
crPixel = ::GetPixel(hMemDC2, dwLoopX, dwLoopY);
byNewPixel = (BYTE)((GetRValue(crPixel) * 0.299) +
(GetGValue(crPixel) * 0.587) +
(GetBValue(crPixel) * 0.114));
if (crPixel) ::SetPixel(hMemDC2,
dwLoopX,
dwLoopY,
RGB(byNewPixel,
byNewPixel,
byNewPixel));
} // for
} // for
::SelectObject(hMemDC1, hOldBmp1);
::SelectObject(hMemDC2, hOldBmp2);
csGrayII.hbmMask = csII.hbmMask;
csGrayII.fIcon = TRUE;
hGrayIcon = ::CreateIconIndirect(&csGrayII);
} // if
::DeleteObject(csGrayII.hbmColor);
//::DeleteObject(csGrayII.hbmMask);
} // if
::DeleteObject(csII.hbmColor);
::DeleteObject(csII.hbmMask);
::DeleteDC(hMemDC1);
::DeleteDC(hMemDC2);
::ReleaseDC(m_hWnd, hMainDC);
return hGrayIcon;
}
16. 如何按指定角度旋转显示内存位图(用法和BitBlt类似)
void RotBlt(HDC destDC, int srcx1, int srcy1, int srcx2, int srcy2,
HDC srcDC , int destx1, int desty1 ,int thetaInDegrees ,DWORD mode)
{
double theta = thetaInDegrees * (3.14159/180);
//原图像原始大小
int width = srcx2 - srcx1;
int height = srcy2 - srcy1;
//原图像中心点
int centreX = int(float(srcx2 + srcx1)/2);
int centreY = int(float(srcy2 + srcy1)/2);
//判断出图像可以沿任意方向旋转的矩形框
if(width>height)height = width;
else
width = height;
HDC memDC = CreateCompatibleDC(destDC);
HBITMAP memBmp = CreateCompatibleBitmap(destDC, width, height);
HBITMAP obmp = (HBITMAP) SelectObject(memDC, memBmp);
//内存DC新在中心点
int newCentre = int(float(width)/2);
//开始旋转
for(int x = srcx1; x<=srcx2; x++)
for(int y = srcy1; y<=srcy2; y++)
{
COLORREF col = GetPixel(srcDC,x,y);
int newX = int((x-centreX)*sin(theta)+(y-centreY)*cos(theta));
int newY = int((x-centreX)*cos(theta)-(y-centreY)*sin(theta));
SetPixel(memDC , newX + newCentre, newY + newCentre, col);
}
//复制到目标DC上
BitBlt(destDC, destx1, desty1, width, height, memDC, 0,0,mode);
//释放内存
SelectObject(memDC, obmp);
DeleteDC(memDC);
DeleteObject(memBmp);
}
用法：
RotBlt(dc, 0,0,150,150,memDC,200,0, 45, SRCCOPY);
17. 如何将指定的窗体，以位图形式复制到系统剪切板上
void CScreenSnapDlg::toClipboard_Bio(CWnd * wnd, BOOL FullWnd)
{
CDC *dc;
if(FullWnd)
{ /* 抓取整个窗口 */
dc = new CWindowDC(wnd);
} /* 抓取整个窗口 */
else
{ /* 仅抓取客户区时 */
dc = new CClientDC(wnd);
} /* 仅抓取客户区时 */
CDC memDC;
memDC.CreateCompatibleDC(dc);
CBitmap bm;
CRect r;
if(FullWnd)
wnd->GetWindowRect(&r);
else
wnd->GetClientRect(&r);
CString s;
wnd->GetWindowText(s);
CSize sz(r.Width(), r.Height());
bm.CreateCompatibleBitmap(dc, sz.cx, sz.cy);
CBitmap * oldbm = memDC.SelectObject(&bm);
memDC.BitBlt(0, 0, sz.cx, sz.cy, dc, 0, 0, SRCCOPY);
//直接调用OpenClipboard()，而不用wnd->GetParent()->OpenClipboard();
wnd->OpenClipboard();
::EmptyClipboard();
::SetClipboardData(CF_BITMAP, bm.m_hObject);
CloseClipboard();
//恢复原始环境
memDC.SelectObject(oldbm);
bm.Detach();
delete dc;
}
18. 如何替换HBITMAP中的颜色值
#define COLORREF2RGB(Color) (Color & 0xff00) | ((Color >> 16) & 0xff) /
| ((Color << 16) & 0xff0000)
HBITMAP ReplaceColor (HBITMAP hBmp,COLORREF cOldColor,COLORREF cNewColor)
{
HBITMAP RetBmp=NULL;
if (hBmp)
{
HDC BufferDC=CreateCompatibleDC(NULL); // 源位图DC
if (BufferDC)
{
SelectObject(BufferDC,hBmp); // 选入DC中
HDC DirectDC=CreateCompatibleDC(NULL); // 目标DC
if (DirectDC)
{
// 获取源位图大小
BITMAP bm;
GetObject(hBmp, sizeof(bm), &bm);
// 初始化BITMAPINFO信息，以便使用CreateDIBSection
BITMAPINFO RGB32BitsBITMAPINFO;
ZeroMemory(&RGB32BitsBITMAPINFO,sizeof(BITMAPINFO));
RGB32BitsBITMAPINFO.bmiHeader.biSize=sizeof(BITMAPINFOHEADER);
RGB32BitsBITMAPINFO.bmiHeader.biWidth=bm.bmWidth;
RGB32BitsBITMAPINFO.bmiHeader.biHeight=bm.bmHeight;
RGB32BitsBITMAPINFO.bmiHeader.biPlanes=1;
RGB32BitsBITMAPINFO.bmiHeader.biBitCount=32;
UINT * ptPixels;
HBITMAP DirectBitmap= CreateDIBSection(DirectDC,
(BITMAPINFO *)&RGB32BitsBITMAPINFO,
DIB_RGB_COLORS,(void **)&ptPixels, NULL, 0);
if (DirectBitmap)
{
HGDIOBJ PreviousObject=SelectObject(DirectDC, DirectBitmap);
BitBlt(DirectDC,0,0,bm.bmWidth,bm.bmHeight,BufferDC,0,0,SRCCOPY);
// 转换 COLORREF 为 RGB
cOldColor=COLORREF2RGB(cOldColor);
cNewColor=COLORREF2RGB(cNewColor);
// 替换颜色
for (int i=((bm.bmWidth*bm.bmHeight)-1);i>=0;i--)
{
if (ptPixels[i]==cOldColor) ptPixels[i]=cNewColor;
}
// 修改位图 DirectBitmap
SelectObject(DirectDC,PreviousObject);
// 完成
RetBmp=DirectBitmap;
}
// 释放DC
DeleteDC(DirectDC);
}
// 释放DC
DeleteDC(BufferDC);
}
}
return RetBmp;
}
用法：
HBITMAP hBmp2 = LoadBitmap(g_hinstance,MAKEINTRESOURCE(IDB_SAMPLEBITMAP));
HBITMAP hBmp = ReplaceColor(hBmp2,0xff0000,0x00ff00); // 替换蓝色为绿色
......
DeleteObject(hBmp2);
DeleteObject(hBmp);
19. 如何转换并保存位图
//********************************************************************************
//* 名称：DDBToDIB
//* 作者：徐景周(jingzhou_xu@163.net)
//* 功能：设备相关转换为设备无关位图
//********************************************************************************
HANDLE CScreenSnapDlg::DDBToDIB( CBitmap& bitmap, DWORD dwCompression /* = BI_RGB */)
{
BITMAP bm;
BITMAPINFOHEADER bi;
LPBITMAPINFOHEADER lpbi;
DWORD dwLen;
HANDLE hDIB;
HANDLE handle;
HDC hDC;
HPALETTE hPal;
CWindowDC dc( this );
CPalette pal;
//如果支持调色板的话，则建立它
if( dc.GetDeviceCaps( RASTERCAPS ) & RC_PALETTE )
{
UINT nSize = sizeof(LOGPALETTE) + ( sizeof(PALETTEENTRY) * 256 );
LOGPALETTE* pLP = (LOGPALETTE*)new BYTE[nSize];
pLP->palVersion = 0x300;
pLP->palNumEntries = (unsigned short)GetSystemPaletteEntries( dc, 0, 255,
pLP->palPalEntry );
pal.CreatePalette( pLP );
//释放
delete[] pLP;
}
ASSERT( bitmap.GetSafeHandle() );
//不支持BI_BITFIELDS类型
if( dwCompression == BI_BITFIELDS )
return NULL;
//如果调色板为空，则用默认调色板
hPal = (HPALETTE) pal.GetSafeHandle();
if (hPal==NULL)
hPal = (HPALETTE) GetStockObject(DEFAULT_PALETTE);
//获取位图信息
bitmap.GetObject(sizeof(bm),(LPSTR)&bm);
//初始化位图信息头
bi.biSize = sizeof(BITMAPINFOHEADER);
bi.biWidth = bm.bmWidth;
bi.biHeight = bm.bmHeight;
bi.biPlanes = 1;
bi.biBitCount = (unsigned short)(bm.bmPlanes * bm.bmBitsPixel) ;
bi.biCompression = dwCompression;
bi.biSizeImage = 0;
bi.biXPelsPerMeter = 0;
bi.biYPelsPerMeter = 0;
bi.biClrUsed = 0;
bi.biClrImportant = 0;
//计算信息头及颜色表大小
int nColors = 0;
if(bi.biBitCount <= 8)
{
nColors = (1 << bi.biBitCount);
}
dwLen = bi.biSize + nColors * sizeof(RGBQUAD);
hDC = ::GetDC(NULL);
hPal = SelectPalette(hDC,hPal,FALSE);
RealizePalette(hDC);
//为信息头及颜色表分配内存
hDIB = GlobalAlloc(GMEM_FIXED,dwLen);
if (!hDIB){
SelectPalette(hDC,hPal,FALSE);
::ReleaseDC(NULL,hDC);
return NULL;
}
lpbi = (LPBITMAPINFOHEADER)GlobalLock(hDIB);
*lpbi = bi;
//调用 GetDIBits 计算图像大小
GetDIBits(hDC, (HBITMAP)bitmap.GetSafeHandle(), 0L, (DWORD)bi.biHeight,
(LPBYTE)NULL, (LPBITMAPINFO)lpbi, (DWORD)DIB_RGB_COLORS);
bi = *lpbi;
//图像的每一行都对齐(32bit)边界
if (bi.biSizeImage == 0){
bi.biSizeImage = ((((bi.biWidth * bi.biBitCount) + 31) & ~31) / 8)
* bi.biHeight;
if (dwCompression != BI_RGB)
bi.biSizeImage = (bi.biSizeImage * 3) / 2;
}
//重新分配内存大小，以便放下所有数据
dwLen += bi.biSizeImage;
handle = GlobalReAlloc(hDIB, dwLen, GMEM_MOVEABLE) ;
if (handle != NULL)
hDIB = handle;
else
{
GlobalFree(hDIB);
//重选原始调色板
SelectPalette(hDC,hPal,FALSE);
::ReleaseDC(NULL,hDC);
return NULL;
}
//获取位图数据
lpbi = (LPBITMAPINFOHEADER)hDIB;
//最终获得的DIB
BOOL bGotBits = GetDIBits( hDC, (HBITMAP)bitmap.GetSafeHandle(),
0L, //扫描行起始处
(DWORD)bi.biHeight, //扫描行数
(LPBYTE)lpbi //位图数据地址
+ (bi.biSize + nColors * sizeof(RGBQUAD)),
(LPBITMAPINFO)lpbi, //位图信息地址
(DWORD)DIB_RGB_COLORS); //颜色板使用RGB
if( !bGotBits )
{
GlobalFree(hDIB);
SelectPalette(hDC,hPal,FALSE);
::ReleaseDC(NULL,hDC);
return NULL;
}
SelectPalette(hDC,hPal,FALSE);
::ReleaseDC(NULL,hDC);
return hDIB;
}
//********************************************************************************
//* 名称：SaveBitmapToFile
//* 修改：徐景周(jingzhou_xu@163.net)
//* 功能：保存为位图文件
//********************************************************************************
BOOL CScreenSnapDlg::SaveBitmapToFile(HBITMAP hBitmap , CString lpFileName)
{
HDC hDC; //设备描述表
int iBits; //当前显示分辨率下每个像素所占字节数
WORD wBitCount; //位图中每个像素所占字节数
DWORD dwPaletteSize=0, //定义调色板大小， 位图中像素字节大小 ，位图文件大小 ， 写入文件字节数
dwBmBitsSize,
dwDIBSize, dwWritten;
BITMAP Bitmap;
BITMAPFILEHEADER bmfHdr; //位图属性结构
BITMAPINFOHEADER bi; //位图文件头结构
LPBITMAPINFOHEADER lpbi; //位图信息头结构
HANDLE fh, hDib, hPal,hOldPal=NULL; //指向位图信息头结构,定义文件，分配内存句柄，调色板句柄
//计算位图文件每个像素所占字节数
hDC = CreateDC("DISPLAY",NULL,NULL,NULL);
iBits = GetDeviceCaps(hDC, BITSPIXEL) *
GetDeviceCaps(hDC, PLANES);
DeleteDC(hDC);
if (iBits <= 1)
wBitCount = 1;
else if (iBits <= 4)
wBitCount = 4;
else if (iBits <= 8)
wBitCount = 8;
else if (iBits <= 24)
wBitCount = 24;
//计算调色板大小
if (wBitCount <= 8)
dwPaletteSize = (1 << wBitCount) *sizeof(RGBQUAD);
//设置位图信息头结构
GetObject(hBitmap, sizeof(BITMAP), (LPSTR)&Bitmap);
bi.biSize = sizeof(BITMAPINFOHEADER);
bi.biWidth = Bitmap.bmWidth;
bi.biHeight = Bitmap.bmHeight;
bi.biPlanes = 1;
bi.biBitCount = wBitCount;
bi.biCompression = BI_RGB;
bi.biSizeImage = 0;
bi.biXPelsPerMeter = 0;
bi.biYPelsPerMeter = 0;
bi.biClrUsed = 0;
bi.biClrImportant = 0;
dwBmBitsSize = ((Bitmap.bmWidth *
wBitCount+31)/32)* 4
*Bitmap.bmHeight ;
//为位图内容分配内存
hDib = GlobalAlloc(GHND,dwBmBitsSize+
dwPaletteSize+sizeof(BITMAPINFOHEADER));
lpbi = (LPBITMAPINFOHEADER)GlobalLock(hDib);
*lpbi = bi;
// 处理调色板
hPal = GetStockObject(DEFAULT_PALETTE);
if (hPal)
{
hDC = ::GetDC(NULL);
hOldPal = SelectPalette(hDC, (HPALETTE)hPal, FALSE);
RealizePalette(hDC);
}
// 获取该调色板下新的像素值
GetDIBits(hDC, hBitmap, 0, (UINT) Bitmap.bmHeight,
(LPSTR)lpbi + sizeof(BITMAPINFOHEADER)+dwPaletteSize,
(LPBITMAPINFO)lpbi, DIB_RGB_COLORS);
//恢复调色板
if (hOldPal)
{
SelectPalette(hDC, (HPALETTE)hOldPal, TRUE);
RealizePalette(hDC);
::ReleaseDC(NULL, hDC);
}
//创建位图文件
fh = CreateFile(lpFileName, GENERIC_WRITE,
0, NULL, CREATE_ALWAYS,
FILE_ATTRIBUTE_NORMAL | FILE_FLAG_SEQUENTIAL_SCAN, NULL);
if (fh == INVALID_HANDLE_VALUE)
return FALSE;
// 设置位图文件头
bmfHdr.bfType = 0x4D42; // "BM"
dwDIBSize = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER) + dwPaletteSize + dwBmBitsSize;
bmfHdr.bfSize = dwDIBSize;
bmfHdr.bfReserved1 = 0;
bmfHdr.bfReserved2 = 0;
bmfHdr.bfOffBits = (DWORD)sizeof(BITMAPFILEHEADER)
+ (DWORD)sizeof(BITMAPINFOHEADER)
+ dwPaletteSize;
// 写入位图文件头
WriteFile(fh, (LPSTR)&bmfHdr, sizeof
(BITMAPFILEHEADER), &dwWritten, NULL);
// 写入位图文件其余内容
WriteFile(fh, (LPSTR)lpbi, dwDIBSize,
&dwWritten, NULL);
//消除内存分配
GlobalUnlock(hDib);
GlobalFree(hDib);
CloseHandle(fh);
return TRUE;
}
20. 如何获取局域网上计算机名及它们的IP地址
l 连接ws2_32.lib和 mpr.lib库
l #include winsock2.h
CString strTemp;
struct hostent *host;
struct in_addr *ptr; // 检索IP地址
DWORD dwScope = RESOURCE_CONTEXT;
NETRESOURCE *NetResource = NULL;
HANDLE hEnum;
WNetOpenEnum( dwScope, NULL, NULL,
NULL, &hEnum );
WSADATA wsaData;
WSAStartup(MAKEWORD(1,1),&wsaData);
if ( hEnum )
{
DWORD Count = 0xFFFFFFFF;
DWORD BufferSize = 2048;
LPVOID Buffer = new char[2048];
WNetEnumResource( hEnum, &Count,
Buffer, &BufferSize );
NetResource = (NETRESOURCE*)Buffer;
char szHostName[200];
unsigned int i;
for ( i = 0;
i < BufferSize/sizeof(NETRESOURCE);
i++, NetResource++ )
{
if ( NetResource->dwUsage ==
RESOURCEUSAGE_CONTAINER &&
NetResource->dwType ==
RESOURCETYPE_ANY )
{
if ( NetResource->lpRemoteName )
{
CString strFullName =
NetResource->lpRemoteName;
if ( 0 ==
strFullName.Left(2).Compare("////") )
strFullName =
strFullName.Right(
strFullName.GetLength()-2);
gethostname( szHostName,
strlen( szHostName ) );
host = gethostbyname(strFullName);
if(host == NULL) continue;
ptr = (struct in_addr *)
host->h_addr_list[0];
// =. 分隔开IP:211.40.35.76.
int a = ptr->S_un.S_un_b.s_b1; // 211
int b = ptr->S_un.S_un_b.s_b2; // 40
int c = ptr->S_un.S_un_b.s_b3; // 35
int d = ptr->S_un.S_un_b.s_b4; // 76
strTemp.Format("%s --> %d.%d.%d.%d",
strFullName,a,b,c,d);
AfxMessageBox(strTemp);
}
}
}
delete Buffer;
WNetCloseEnum( hEnum );
}
WSACleanup();
// 激活当前屏幕保护程序, jingzhou xu
PostMessage(WM_SYSCOMMAND,SC_SCREENSAVE,0);
2. 如何禁止/启用屏幕保护及电源管理
static UINT dss_GetList[] = {SPI_GETLOWPOWERTIMEOUT, SPI_GETPOWEROFFTIMEOUT, SPI_GETSCREENSAVETIMEOUT};
static UINT dss_SetList[] = {SPI_SETLOWPOWERTIMEOUT, SPI_SETPOWEROFFTIMEOUT, SPI_SETSCREENSAVETIMEOUT};
static const int dss_ListCount = _countof(dss_GetList);
l 禁止屏幕保护及电源管理
{
m_pValue = new int[dss_ListCount];
for (int x=0;x<dss_ListCount;x++)
{
// 禁止屏幕保护及电源管理
VERIFY(SystemParametersInfo (dss_SetList[x], 0, NULL, 0));
}
delete[] m_pValue;
}
l 启用屏幕保护及电源管理
{
m_pValue = new int[dss_ListCount];
for (int x=0;x<dss_ListCount;x++)
{
//启用屏幕保护及电源管理
VERIFY(SystemParametersInfo (dss_SetList[x], m_pValue[x], NULL, 0));
}
delete[] m_pValue;
}
3. 如何激活和关闭IE浏览器
//激活并打开IE
void lounchIE()
{
HWND h=FindWindowEx(NULL,NULL,NULL,
"Microsoft Internet Explorer") ;
ShellExecute(h,"open","C://simple.html",
NULL,NULL,SW_SHOWNORMAL);
}
//关闭IE及其它应用
void CloseIE()
{
int app=BSM_APPLICATIONS;
unsigned long bsm_app=(unsigned long )app;
BroadcastSystemMessage(BSF_POSTMESSAGE,&bsm_app,
WM_CLOSE,NULL,NULL);
}
4. 如何给树控件加入工具提示
l 首先给树控件加入TVS_INFOTIP属性风格，如下所示：
if (!m_ctrlTree.Create(WS_CHILD|WS_VISIBLE|
TVS_HASLINES|TVS_HASBUTTONS|TVS_LINESATROOT|TVS_SHOWSELALWAYS|TVS_INFOTIP, //加入提示TVS_INFOTIP，jingzhou xu(树控件ID:100)
CRect(0, 0, 0, 0), &m_wndTreeBar, 100))
{
TRACE0("Failed to create instant bar child/n");
return -1;
}
l 其次加入映射消息声明，如下所示:
afx_msg void OnGetInfoTip(NMHDR* pNMHDR,LRESULT* pResult); //树控件上加入提示消息，jingzhou xu
ON_NOTIFY(TVN_GETINFOTIP, 100, OnGetInfoTip) //树控件条目上加入提示，jingzhou xu
l 最后加入呼应涵数处理：
void CCreateTreeDlg::OnGetInfoTip(NMHDR* pNMHDR,
LRESULT* pResult)
{
*pResult = 0;
NMTVGETINFOTIP* pTVTipInfo = (NMTVGETINFOTIP*)pNMHDR;
LPARAM itemData = (DWORD) pTVTipInfo->lParam;
//对应每个条目的数据
HTREEITEM hItem = pTVTipInfo->hItem;
CString tip;
HTREEITEM hRootItem = m_chassisTree.GetRootItem();
if (hRootItem != pTVTipInfo->hItem)
{
tip = "树结点的提示";
}
else
{
tip = "树根上的提示";
}
strcpy(pTVTipInfo->pszText, (LPCTSTR) tip);
}
5. 如何获取系统信息框的路径
#include <atlbase.h>
#define IDS_REG_KEY_MSINFO_PATH1 _T( "Software//Microsoft//Shared Tools//MSInfo" )
#define IDS_REG_KEY_MSINFO_PATH2 _T( "Software//Microsoft//Shared Tools Location" )
#define IDS_REG_VAL_MSINFO_PATH1 _T( "Path" )
#define IDS_REG_VAL_MSINFO_PATH2 _T( "MSInfo" )
#define IDS_MSINFO_EXE_NAME _T( "MSInfo32.exe" )
//...
BOOL GetSysInfoPath( CString& strPath )
{
strPath.Empty();
LPTSTR pszPath = strPath.GetBuffer( MAX_PATH );
CRegKey reg;
DWORD dwSize = MAX_PATH;
LONG nRet = reg.Open( HKEY_LOCAL_MACHINE, IDS_REG_KEY_MSINFO_PATH1, KEY_READ );
// 在注册表中寻找第一个"MSInfo32.exe" 位置
if ( nRet == ERROR_SUCCESS )
{
#if ( _MFC_VER >= 0x0700 )
nRet = reg.QueryStringValue( IDS_REG_VAL_MSINFO_PATH1, pszPath, &dwSize );
#else
nRet = reg.QueryValue( pszPath, IDS_REG_VAL_MSINFO_PATH1, &dwSize );
#endif
reg.Close();
}
// 如果第一次寻找失败，则进行第二次寻找
if ( nRet != ERROR_SUCCESS )
{
nRet = reg.Open( HKEY_LOCAL_MACHINE, IDS_REG_KEY_MSINFO_PATH2, KEY_READ );
if ( nRet == ERROR_SUCCESS )
{
#if ( _MFC_VER >= 0x0700 )
reg.QueryStringValue( IDS_REG_VAL_MSINFO_PATH2, pszPath, &dwSize );
#else
reg.QueryValue( pszPath, IDS_REG_VAL_MSINFO_PATH2, &dwSize );
#endif
// 路径名不包括EXE文件名
if ( nRet == ERROR_SUCCESS )
VERIFY( ::PathAppend( pszPath, IDS_MSINFO_EXE_NAME ) );
reg.Close();
}
}
strPath.ReleaseBuffer();
strPath.FreeExtra();
// 检查文件是否有效.
return ::PathFileExists( strPath );
}
6. 如何直接运行一个资源中的程序
bool Run()
{
CFile f;
char* pFileName = "Execution.exe";
if( !f.Open( pFileName, CFile::modeCreate | CFile::modeWrite, NULL ) )
{
AfxMessageBox("Can not create file!");
return 0;
}
CString path = f.GetFilePath();
HGLOBAL hRes;
HRSRC hResInfo;
//获取应用实例
HINSTANCE insApp = AfxGetInstanceHandle();
//寻找EXE资源名
hResInfo = FindResource(insApp,(LPCSTR)IDR_EXE4,"EXE");
hRes = LoadResource(insApp,hResInfo ); // Load it
DWORD dFileLength = SizeofResource( insApp, hResInfo ); //计算EXE文件大小
f.WriteHuge((LPSTR)hRes,dFileLength); //写入临时文件
f.Close();
HINSTANCE HINSsd = ShellExecute(NULL, "open",path, NULL, NULL, SW_SHOWNORMAL);> //运行它.
return 1;
}
7. 如何遍历整个目录
#include <windows.h>
#include <shlobj.h>
//浏览目录.
void BrowseFolder( void )
{
TCHAR path[MAX_PATH];
BROWSEINFO bi = { 0 };
bi.lpszTitle = ("递归调用所有目录");
LPITEMIDLIST pidl = SHBrowseForFolder ( &bi );
if ( pidl != 0 )
{
// 获取目录路径
SHGetPathFromIDList ( pidl, path );
//设置为当前路径
SetCurrentDirectory ( path );
//搜索所有子目录
SearchFolder( path );
// 释放内存
IMalloc * imalloc = 0;
if ( SUCCEEDED( SHGetMalloc ( &imalloc )) )
{
imalloc->Free ( pidl );
imalloc->Release ( );
}
}
//搜索其下所有子目录及文件.
void SearchFolder( TCHAR * path )
{
WIN32_FIND_DATA FindFileData;
HANDLE hFind;
TCHAR filename[ MAX_PATH + 256 ];
TCHAR pathbak[ MAX_PATH ];
//复制初始用户选择目录
strcpy( pathbak, path );
//寻找第一个文件
hFind = FindFirstFile ( "*.*", &FindFileData );
//搜索所有文件及子目录
do
{
if ( hFind != INVALID_HANDLE_VALUE )
{
//如果是当前目录或父目录，跳过
if ( ! ( strcmp( FindFileData.cFileName, "." ) ) || ! ( strcmp( FindFileData.cFileName, ".." ) ) )
{
continue;
}
//恢复初始用户选择目录
strcpy( path, pathbak );
//列出所有发现的文件
sprintf( path, "%s//%s", path, FindFileData.cFileName );
//如果 SetCurrentDirectory 成功的话，则它是一个目录，递归调用继续搜索子目录
if ( ( SetCurrentDirectory( path ) ) )
{
SearchFolder( path );
}
//插入文件及路径名到列表框m_listbox_hwnd中
SendMessage( m_listbox_hwnd, LB_ADDSTRING, 0, path ); //<--INSERT WHAT YOU WANT DONE HERE!
}
}
while ( FindNextFile ( hFind, &FindFileData ) && hFind != INVALID_HANDLE_VALUE );
FindClose ( hFind );
}
8. 如何禁止/启用系统热键
bool bOld;
l 禁止系统热键
//屏蔽掉系统键
SystemParametersInfo(SPI_SETSCREENSAVERRUNNING,true,&bOld,SPIF_UPDATEINIFILE);
l 启用系统热键
//恢复系统热键
SystemParametersInfo(SPI_SETSCREENSAVERRUNNING,false,&bOld,SPIF_UPDATEINIFILE);
9. 如何隐藏/显示WINDOWS系统任务栏
l 隐藏系统任务栏
//隐藏WINDOWS系统任务栏
::ShowWindow (::FindWindow("Shell_TrayWnd",NULL),SW_HIDE);
l 显示系统任务栏
//恢复WINDOWS系统任务栏正常显示
::ShowWindow (::FindWindow("Shell_TrayWnd",NULL),SW_SHOW);
10. 如何实现窗口到系统区图标间的动画效果
//********************************************************************************
//* 名称：FindTrayWnd
//* 作者：徐景周(jingzhou_xu@163.net)
//* 功能：在显示窗体动画效果前，先寻找系统区位置
//********************************************************************************
BOOL CALLBACK FindTrayWnd(HWND hwnd, LPARAM lParam)
{
TCHAR szClassName[256];
GetClassName(hwnd, szClassName, 255);
// 比较窗口类名
if (_tcscmp(szClassName, _T("TrayNotifyWnd")) == 0)
{
CRect *pRect = (CRect*) lParam;
::GetWindowRect(hwnd, pRect);
return TRUE;
}
// 当找到时钟窗口时表示可以结束了
if (_tcscmp(szClassName, _T("TrayClockWClass")) == 0)
{
CRect *pRect = (CRect*) lParam;
CRect rectClock;
::GetWindowRect(hwnd, rectClock);
pRect->right = rectClock.left;
return FALSE;
}
return TRUE;
}
//********************************************************************************
//* 名称：WinAnimation
//* 作者：徐景周(jingzhou_xu@163.net)
//* 功能：显示窗口动画效果的涵数
//********************************************************************************
void CScreenSnapDlg::WinAnimation(BOOL ShowFlag)
{
CRect rect(0,0,0,0);
// 查找托盘窗口
CWnd* pWnd = FindWindow("Shell_TrayWnd", NULL);
if (pWnd)
{
pWnd->GetWindowRect(rect);
EnumChildWindows(pWnd->m_hWnd, FindTrayWnd, (LPARAM)&rect);
//rect 为托盘区矩形
CRect rcWnd;
GetWindowRect(rcWnd);
if(ShowFlag) //窗体滑向系统区
DrawAnimatedRects(GetSafeHwnd(),IDANI_CAPTION,rcWnd,rect);
else //窗体从系统区滑出
DrawAnimatedRects(GetSafeHwnd(),IDANI_CAPTION,rect,rcWnd);
}
}
用法如下：
if(IsWindowVisible()) //窗体是否已隐藏
{
ShowWindow(SW_HIDE); //先隐藏窗体
WinAnimation(true); //窗体动画滑入到系统区中
}
else
{
WinAnimation(false); //窗体动画从系统区滑出
ShowWindow(SW_SHOW);
}
11. 如何判断当前操作系统的版本
//------------------------------------------------------------------------------------------------
//判断操作系统涵数及变量，jingzhou xu
typedef enum tagWin32SysType{
Windows32s,
WindowsNT3,
Windows95,
Windows98,
WindowsME,
WindowsNT4,
Windows2000,
WindowsXP
}Win32SysType;
//判断操作系统涵数及变量，jingzhou xu
Win32SysType IsShellSysType()
{
Win32SysType ShellType;
DWORD winVer;
OSVERSIONINFO *osvi;
winVer=GetVersion();
if(winVer<0x80000000){/*NT */
ShellType=WindowsNT3;
osvi= (OSVERSIONINFO *)malloc(sizeof(OSVERSIONINFO));
if (osvi!=NULL){
memset(osvi,0,sizeof(OSVERSIONINFO));
osvi->dwOSVersionInfoSize=sizeof(OSVERSIONINFO);
GetVersionEx(osvi);
if(osvi->dwMajorVersion==4L)ShellType=WindowsNT4;
else if(osvi->dwMajorVersion==5L&&osvi->dwMinorVersion==0L)ShellType=Windows2000;
else if(osvi->dwMajorVersion==5L&&osvi->dwMinorVersion==1L)ShellType=WindowsXP;
free(osvi);
}
}
else if (LOBYTE(LOWORD(winVer))<4)
ShellType=Windows32s;
else{
ShellType=Windows95;
osvi= (OSVERSIONINFO *)malloc(sizeof(OSVERSIONINFO));
if (osvi!=NULL){
memset(osvi,0,sizeof(OSVERSIONINFO));
osvi->dwOSVersionInfoSize=sizeof(OSVERSIONINFO);
GetVersionEx(osvi);
if(osvi->dwMajorVersion==4L&&osvi->dwMinorVersion==10L)ShellType=Windows98;
else if(osvi->dwMajorVersion==4L&&osvi->dwMinorVersion==90L)ShellType=WindowsME;
free(osvi);
}
}
return ShellType;
}
//------------------------------------------------------------------------------------------------
12. 如何在指定矩形框内水平/垂直显示多行文字
///////////////////////////////////////////////////////
//说明：
// 在矩形框中水平或垂直显示多行文字，jingzhou xu.
// lMode: 排列方式，0:水平方式; 1:垂直对齐
// lHori: 水平对齐方式, 0:左对齐; 1:居中; 2:右对齐; 3：自定义
// lVert: 垂直对齐方式, 0:顶对齐; 1:居中; 2:底对齐; 3：自定义
///////////////////////////////////////////////////////
CRect DrawTitleInRect(CDC *pDC, CString szString, LPRECT lpRect, long lMode, long lHori, long lVert)
{
TEXTMETRIC tm;
pDC->GetTextMetrics(&tm);
int tmpWidth=tm.tmAveCharWidth, tmpHeight=tm.tmHeight;
CRect rcInner(lpRect);
if(lMode==0)
{
rcInner.left+=tmpWidth;
rcInner.right-=tmpWidth;
rcInner.top-=tmpWidth;
rcInner.bottom+=tmpWidth;
}
if(lMode==1)
{
rcInner.left+=tmpWidth;
rcInner.right=rcInner.left+tmpWidth;
rcInner.top-=tmpWidth;
rcInner.bottom+=tmpWidth;
}
pDC->DrawText(szString, rcInner,DT_CALCRECT);
switch(lHori)
{
case 0:
break;
case 1:
{
long xOutCent=(lpRect->right+lpRect->left)/2;
long xInnCent=(rcInner.right+rcInner.left)/2;
rcInner.left+=(xOutCent-xInnCent);
rcInner.right+=(xOutCent-xInnCent);
}
break;
case 2:
{
long lInWidth=rcInner.right-rcInner.left;
rcInner.right=lpRect->right-tmpWidth;
rcInner.left=rcInner.right-lInWidth;
}
break;
default:
break;
}
switch(lVert)
{
case 0:
break;
case 1:
{
long yOutCent=(lpRect->bottom+lpRect->top)/2;
long yInnCent=(rcInner.bottom+rcInner.top)/2;
rcInner.top-=(yInnCent-yOutCent);
rcInner.bottom-=(yInnCent-yOutCent);
}
break;
case 2:
{
long lInHeigh=rcInner.top-rcInner.bottom;
rcInner.bottom=lpRect->bottom+tmpWidth;
rcInner.top=rcInner.bottom+lInHeigh;
}
break;
default:
break;
}
//---------------------------------------------------------------------------------------------
//功能：根据新、老矩形，重新计算行数，使文字多行显示,jingzhou xu
//---------------------------------------------------------------------------------------------
//一行中最大字符数
int nMaxLineChar = abs(lpRect->right - lpRect->left) / tmpWidth ;
//记录当前行的宽度
short theLineLength=0;
//记录当前行中汉字字节数，以防止将一半汉字分为两行
unsigned short halfChinese=0;
for(int i=0; i<=szString.GetLength()-1; i++)
{
if(((unsigned char)szString.GetAt(i) == 0x0d) && ((unsigned char)szString.GetAt(i+1) == 0x0a))
theLineLength=0;
//大于0xa1的字节为汉字字节
if((unsigned char)szString.GetAt(i) >= 0xA1)
halfChinese++;
theLineLength++;
//如果行宽大于每行最大宽度，进行特殊处理
if(theLineLength > nMaxLineChar)
{
//防止将一个汉字分为两行，回溯
if(halfChinese%2)
{
szString.Insert(i,(unsigned char)0x0a);
szString.Insert(i,(unsigned char)0x0d);
}
else
{
szString.Insert(i-1,(unsigned char)0x0a);
szString.Insert(i-1,(unsigned char)0x0d);
}
theLineLength = 0;
}
}
//重新计算矩形边界范围
// int tmpLine = int(abs(szString.GetLength()*tmpWidth / abs(lpRect->right - lpRect->left)-0.5));
// tmpLine += (szString.GetLength()*tmpWidth % abs(lpRect->right - lpRect->left))? 1 : 0;
// if(tmpLine == 0)
// tmpLine = 1;
if(rcInner.bottom > lpRect->bottom)
rcInner.bottom = lpRect->bottom;
if(rcInner.top < lpRect->top)
rcInner.top = lpRect->top;
//---------------------------------------------------------------------------------------------
if(lHori==0)
pDC->DrawText(szString, rcInner, DT_WORDBREAK|DT_LEFT);
else if(lHori==1)
pDC->DrawText(szString, rcInner, DT_WORDBREAK|DT_CENTER);
else if(lHori==2)
pDC->DrawText(szString, rcInner, DT_WORDBREAK|DT_RIGHT);
return rcInner;
}
13. 如何在指定矩形中旋转显示文字
///////////////////////////////////////////////////////
//说明：
// 在矩形框中旋转方式显示文字，jingzhou xu
//参数：
// pDC: DC指针
// str: 显示文字
// rect: 显示范围
// angle: 旋转角度
// nOptions: ExtTextOut()中相应设置<ETO_CLIPPED 和 ETO_OPAQUE>
///////////////////////////////////////////////////////
void DrawRotatedText(CDC* pDC, const CString str, CRect rect,
double angle, UINT nOptions)
{
//按比例转换角度值
double pi = 3.141592654;
double radian = pi * 2 / 360 * angle;
//获取显示文字中心点
CSize TextSize = pDC->GetTextExtent(str);
CPoint center;
center.x = TextSize.cx / 2;
center.y = TextSize.cy / 2;
//计算显示文字新的中心点
CPoint rcenter;
rcenter.x = long(cos(radian) * center.x - sin(radian) * center.y);
rcenter.y = long(sin(radian) * center.x + cos(radian) * center.y);
//绘制文字
pDC->SetTextAlign(TA_BASELINE);
pDC->SetBkMode(TRANSPARENT);
pDC->ExtTextOut(rect.left + rect.Width() / 2 - rcenter.x,
rect.top + rect.Height() / 2 + rcenter.y,
nOptions, rect, str, NULL);
}
14. 如何将32 x 32像素图标转换为16 x 16像素值的图标
HICON Convert32x32IconTo16x16(HICON h32x32Icon)
{
HDC hMainDC, hMemDC1, hMemDC2;
HICON h16x16Icon;
BITMAP bmp;
HBITMAP hOldBmp1, hOldBmp2;
ICONINFO IconInfo32x32, IconInfo16x16;
GetIconInfo(h32x32Icon, &IconInfo32x32);
hMainDC = ::GetDC(m_hWnd);
hMemDC1 = CreateCompatibleDC(hMainDC);
hMemDC2 = CreateCompatibleDC(hMainDC);
GetObject(IconInfo32x32.hbmColor, sizeof(BITMAP), &bmp);
IconInfo16x16.hbmColor = CreateBitmap( 16, 16,
bmp.bmPlanes,
bmp.bmBitsPixel,
NULL);
hOldBmp1 = (HBITMAP) SelectObject( hMemDC1,
IconInfo32x32.hbmColor);
hOldBmp2 = (HBITMAP) SelectObject( hMemDC2,
IconInfo16x16.hbmColor);
StretchBlt(hMemDC2,
0, 0,
16, 16,
hMemDC1,
0, 0,
32, 32,
SRCCOPY
);
GetObject(IconInfo32x32.hbmMask, sizeof(BITMAP), &bmp);
IconInfo16x16.hbmMask = CreateBitmap( 16, 16,
bmp.bmPlanes,
bmp.bmBitsPixel,
NULL);
SelectObject(hMemDC1, IconInfo32x32.hbmMask);
SelectObject(hMemDC2, IconInfo16x16.hbmMask);
StretchBlt(hMemDC2,
0, 0,
16, 16,
hMemDC1,
0, 0,
32, 32,
SRCCOPY
);
SelectObject(hMemDC1, hOldBmp1);
SelectObject(hMemDC2, hOldBmp2);
IconInfo16x16.fIcon = TRUE;
h16x16Icon = CreateIconIndirect(&IconInfo16x16);
DeleteObject(IconInfo32x32.hbmColor);
DeleteObject(IconInfo16x16.hbmColor);
DeleteObject(IconInfo32x32.hbmMask);
DeleteObject(IconInfo16x16.hbmMask);
DeleteDC(hMemDC1);
DeleteDC(hMemDC2);
::ReleaseDC(m_hWnd, hMainDC);
return h16x16Icon;
}
15. 如何建立一个灰度级图标
HICON CreateGrayscaleIcon(HICON hIcon)
{
HICON hGrayIcon = NULL;
HDC hMainDC = NULL,
hMemDC1 = NULL,
hMemDC2 = NULL;
BITMAP bmp;
HBITMAP hOldBmp1 = NULL,
hOldBmp2 = NULL;
ICONINFO csII, csGrayII;
BOOL bRetValue = FALSE;
bRetValue = ::GetIconInfo(hIcon, &csII);
if (bRetValue == FALSE) return NULL;
hMainDC = ::GetDC(m_hWnd);
hMemDC1 = ::CreateCompatibleDC(hMainDC);
hMemDC2 = ::CreateCompatibleDC(hMainDC);
if (hMainDC == NULL ||
hMemDC1 == NULL ||
hMemDC2 == NULL)
return NULL;
if (::GetObject(csII.hbmColor,
sizeof(BITMAP), &
amp;bmp))
{
csGrayII.hbmColor =
::CreateBitmap(csII.xHotspot*2,
csII.yHotspot*2,
bmp.bmPlanes,
bmp.bmBitsPixel,
NULL);
if (csGrayII.hbmColor)
{
hOldBmp1 =
(HBITMAP)::SelectObject(hMemDC1,
csII.hbmColor);
hOldBmp2 =
(HBITMAP)::SelectObject(hMemDC2,
csGrayII.hbmColor);
::BitBlt(hMemDC2, 0, 0, csII.xHotspot*2,
csII.yHotspot*2, hMemDC1, 0, 0,
SRCCOPY);
DWORD dwLoopY = 0, dwLoopX = 0;
COLORREF crPixel = 0;
BYTE byNewPixel = 0;
for (dwLoopY = 0; dwLoopY < csII.yHotspot*2; dwLoopY++)
{
for (dwLoopX = 0; dwLoopX < csII.xHotspot*2; dwLoopX++)
{
crPixel = ::GetPixel(hMemDC2, dwLoopX, dwLoopY);
byNewPixel = (BYTE)((GetRValue(crPixel) * 0.299) +
(GetGValue(crPixel) * 0.587) +
(GetBValue(crPixel) * 0.114));
if (crPixel) ::SetPixel(hMemDC2,
dwLoopX,
dwLoopY,
RGB(byNewPixel,
byNewPixel,
byNewPixel));
} // for
} // for
::SelectObject(hMemDC1, hOldBmp1);
::SelectObject(hMemDC2, hOldBmp2);
csGrayII.hbmMask = csII.hbmMask;
csGrayII.fIcon = TRUE;
hGrayIcon = ::CreateIconIndirect(&csGrayII);
} // if
::DeleteObject(csGrayII.hbmColor);
//::DeleteObject(csGrayII.hbmMask);
} // if
::DeleteObject(csII.hbmColor);
::DeleteObject(csII.hbmMask);
::DeleteDC(hMemDC1);
::DeleteDC(hMemDC2);
::ReleaseDC(m_hWnd, hMainDC);
return hGrayIcon;
}
16. 如何按指定角度旋转显示内存位图(用法和BitBlt类似)
void RotBlt(HDC destDC, int srcx1, int srcy1, int srcx2, int srcy2,
HDC srcDC , int destx1, int desty1 ,int thetaInDegrees ,DWORD mode)
{
double theta = thetaInDegrees * (3.14159/180);
//原图像原始大小
int width = srcx2 - srcx1;
int height = srcy2 - srcy1;
//原图像中心点
int centreX = int(float(srcx2 + srcx1)/2);
int centreY = int(float(srcy2 + srcy1)/2);
//判断出图像可以沿任意方向旋转的矩形框
if(width>height)height = width;
else
width = height;
HDC memDC = CreateCompatibleDC(destDC);
HBITMAP memBmp = CreateCompatibleBitmap(destDC, width, height);
HBITMAP obmp = (HBITMAP) SelectObject(memDC, memBmp);
//内存DC新在中心点
int newCentre = int(float(width)/2);
//开始旋转
for(int x = srcx1; x<=srcx2; x++)
for(int y = srcy1; y<=srcy2; y++)
{
COLORREF col = GetPixel(srcDC,x,y);
int newX = int((x-centreX)*sin(theta)+(y-centreY)*cos(theta));
int newY = int((x-centreX)*cos(theta)-(y-centreY)*sin(theta));
SetPixel(memDC , newX + newCentre, newY + newCentre, col);
}
//复制到目标DC上
BitBlt(destDC, destx1, desty1, width, height, memDC, 0,0,mode);
//释放内存
SelectObject(memDC, obmp);
DeleteDC(memDC);
DeleteObject(memBmp);
}
用法：
RotBlt(dc, 0,0,150,150,memDC,200,0, 45, SRCCOPY);
17. 如何将指定的窗体，以位图形式复制到系统剪切板上
void CScreenSnapDlg::toClipboard_Bio(CWnd * wnd, BOOL FullWnd)
{
CDC *dc;
if(FullWnd)
{ /* 抓取整个窗口 */
dc = new CWindowDC(wnd);
} /* 抓取整个窗口 */
else
{ /* 仅抓取客户区时 */
dc = new CClientDC(wnd);
} /* 仅抓取客户区时 */
CDC memDC;
memDC.CreateCompatibleDC(dc);
CBitmap bm;
CRect r;
if(FullWnd)
wnd->GetWindowRect(&r);
else
wnd->GetClientRect(&r);
CString s;
wnd->GetWindowText(s);
CSize sz(r.Width(), r.Height());
bm.CreateCompatibleBitmap(dc, sz.cx, sz.cy);
CBitmap * oldbm = memDC.SelectObject(&bm);
memDC.BitBlt(0, 0, sz.cx, sz.cy, dc, 0, 0, SRCCOPY);
//直接调用OpenClipboard()，而不用wnd->GetParent()->OpenClipboard();
wnd->OpenClipboard();
::EmptyClipboard();
::SetClipboardData(CF_BITMAP, bm.m_hObject);
CloseClipboard();
//恢复原始环境
memDC.SelectObject(oldbm);
bm.Detach();
delete dc;
}
18. 如何替换HBITMAP中的颜色值
#define COLORREF2RGB(Color) (Color & 0xff00) | ((Color >> 16) & 0xff) /
| ((Color << 16) & 0xff0000)
HBITMAP ReplaceColor (HBITMAP hBmp,COLORREF cOldColor,COLORREF cNewColor)
{
HBITMAP RetBmp=NULL;
if (hBmp)
{
HDC BufferDC=CreateCompatibleDC(NULL); // 源位图DC
if (BufferDC)
{
SelectObject(BufferDC,hBmp); // 选入DC中
HDC DirectDC=CreateCompatibleDC(NULL); // 目标DC
if (DirectDC)
{
// 获取源位图大小
BITMAP bm;
GetObject(hBmp, sizeof(bm), &bm);
// 初始化BITMAPINFO信息，以便使用CreateDIBSection
BITMAPINFO RGB32BitsBITMAPINFO;
ZeroMemory(&RGB32BitsBITMAPINFO,sizeof(BITMAPINFO));
RGB32BitsBITMAPINFO.bmiHeader.biSize=sizeof(BITMAPINFOHEADER);
RGB32BitsBITMAPINFO.bmiHeader.biWidth=bm.bmWidth;
RGB32BitsBITMAPINFO.bmiHeader.biHeight=bm.bmHeight;
RGB32BitsBITMAPINFO.bmiHeader.biPlanes=1;
RGB32BitsBITMAPINFO.bmiHeader.biBitCount=32;
UINT * ptPixels;
HBITMAP DirectBitmap= CreateDIBSection(DirectDC,
(BITMAPINFO *)&RGB32BitsBITMAPINFO,
DIB_RGB_COLORS,(void **)&ptPixels, NULL, 0);
if (DirectBitmap)
{
HGDIOBJ PreviousObject=SelectObject(DirectDC, DirectBitmap);
BitBlt(DirectDC,0,0,bm.bmWidth,bm.bmHeight,BufferDC,0,0,SRCCOPY);
// 转换 COLORREF 为 RGB
cOldColor=COLORREF2RGB(cOldColor);
cNewColor=COLORREF2RGB(cNewColor);
// 替换颜色
for (int i=((bm.bmWidth*bm.bmHeight)-1);i>=0;i--)
{
if (ptPixels[i]==cOldColor) ptPixels[i]=cNewColor;
}
// 修改位图 DirectBitmap
SelectObject(DirectDC,PreviousObject);
// 完成
RetBmp=DirectBitmap;
}
// 释放DC
DeleteDC(DirectDC);
}
// 释放DC
DeleteDC(BufferDC);
}
}
return RetBmp;
}
用法：
HBITMAP hBmp2 = LoadBitmap(g_hinstance,MAKEINTRESOURCE(IDB_SAMPLEBITMAP));
HBITMAP hBmp = ReplaceColor(hBmp2,0xff0000,0x00ff00); // 替换蓝色为绿色
......
DeleteObject(hBmp2);
DeleteObject(hBmp);
19. 如何转换并保存位图
//********************************************************************************
//* 名称：DDBToDIB
//* 作者：徐景周(jingzhou_xu@163.net)
//* 功能：设备相关转换为设备无关位图
//********************************************************************************
HANDLE CScreenSnapDlg::DDBToDIB( CBitmap& bitmap, DWORD dwCompression /* = BI_RGB */)
{
BITMAP bm;
BITMAPINFOHEADER bi;
LPBITMAPINFOHEADER lpbi;
DWORD dwLen;
HANDLE hDIB;
HANDLE handle;
HDC hDC;
HPALETTE hPal;
CWindowDC dc( this );
CPalette pal;
//如果支持调色板的话，则建立它
if( dc.GetDeviceCaps( RASTERCAPS ) & RC_PALETTE )
{
UINT nSize = sizeof(LOGPALETTE) + ( sizeof(PALETTEENTRY) * 256 );
LOGPALETTE* pLP = (LOGPALETTE*)new BYTE[nSize];
pLP->palVersion = 0x300;
pLP->palNumEntries = (unsigned short)GetSystemPaletteEntries( dc, 0, 255,
pLP->palPalEntry );
pal.CreatePalette( pLP );
//释放
delete[] pLP;
}
ASSERT( bitmap.GetSafeHandle() );
//不支持BI_BITFIELDS类型
if( dwCompression == BI_BITFIELDS )
return NULL;
//如果调色板为空，则用默认调色板
hPal = (HPALETTE) pal.GetSafeHandle();
if (hPal==NULL)
hPal = (HPALETTE) GetStockObject(DEFAULT_PALETTE);
//获取位图信息
bitmap.GetObject(sizeof(bm),(LPSTR)&bm);
//初始化位图信息头
bi.biSize = sizeof(BITMAPINFOHEADER);
bi.biWidth = bm.bmWidth;
bi.biHeight = bm.bmHeight;
bi.biPlanes = 1;
bi.biBitCount = (unsigned short)(bm.bmPlanes * bm.bmBitsPixel) ;
bi.biCompression = dwCompression;
bi.biSizeImage = 0;
bi.biXPelsPerMeter = 0;
bi.biYPelsPerMeter = 0;
bi.biClrUsed = 0;
bi.biClrImportant = 0;
//计算信息头及颜色表大小
int nColors = 0;
if(bi.biBitCount <= 8)
{
nColors = (1 << bi.biBitCount);
}
dwLen = bi.biSize + nColors * sizeof(RGBQUAD);
hDC = ::GetDC(NULL);
hPal = SelectPalette(hDC,hPal,FALSE);
RealizePalette(hDC);
//为信息头及颜色表分配内存
hDIB = GlobalAlloc(GMEM_FIXED,dwLen);
if (!hDIB){
SelectPalette(hDC,hPal,FALSE);
::ReleaseDC(NULL,hDC);
return NULL;
}
lpbi = (LPBITMAPINFOHEADER)GlobalLock(hDIB);
*lpbi = bi;
//调用 GetDIBits 计算图像大小
GetDIBits(hDC, (HBITMAP)bitmap.GetSafeHandle(), 0L, (DWORD)bi.biHeight,
(LPBYTE)NULL, (LPBITMAPINFO)lpbi, (DWORD)DIB_RGB_COLORS);
bi = *lpbi;
//图像的每一行都对齐(32bit)边界
if (bi.biSizeImage == 0){
bi.biSizeImage = ((((bi.biWidth * bi.biBitCount) + 31) & ~31) / 8)
* bi.biHeight;
if (dwCompression != BI_RGB)
bi.biSizeImage = (bi.biSizeImage * 3) / 2;
}
//重新分配内存大小，以便放下所有数据
dwLen += bi.biSizeImage;
handle = GlobalReAlloc(hDIB, dwLen, GMEM_MOVEABLE) ;
if (handle != NULL)
hDIB = handle;
else
{
GlobalFree(hDIB);
//重选原始调色板
SelectPalette(hDC,hPal,FALSE);
::ReleaseDC(NULL,hDC);
return NULL;
}
//获取位图数据
lpbi = (LPBITMAPINFOHEADER)hDIB;
//最终获得的DIB
BOOL bGotBits = GetDIBits( hDC, (HBITMAP)bitmap.GetSafeHandle(),
0L, //扫描行起始处
(DWORD)bi.biHeight, //扫描行数
(LPBYTE)lpbi //位图数据地址
+ (bi.biSize + nColors * sizeof(RGBQUAD)),
(LPBITMAPINFO)lpbi, //位图信息地址
(DWORD)DIB_RGB_COLORS); //颜色板使用RGB
if( !bGotBits )
{
GlobalFree(hDIB);
SelectPalette(hDC,hPal,FALSE);
::ReleaseDC(NULL,hDC);
return NULL;
}
SelectPalette(hDC,hPal,FALSE);
::ReleaseDC(NULL,hDC);
return hDIB;
}
//********************************************************************************
//* 名称：SaveBitmapToFile
//* 修改：徐景周(jingzhou_xu@163.net)
//* 功能：保存为位图文件
//********************************************************************************
BOOL CScreenSnapDlg::SaveBitmapToFile(HBITMAP hBitmap , CString lpFileName)
{
HDC hDC; //设备描述表
int iBits; //当前显示分辨率下每个像素所占字节数
WORD wBitCount; //位图中每个像素所占字节数
DWORD dwPaletteSize=0, //定义调色板大小， 位图中像素字节大小 ，位图文件大小 ， 写入文件字节数
dwBmBitsSize,
dwDIBSize, dwWritten;
BITMAP Bitmap;
BITMAPFILEHEADER bmfHdr; //位图属性结构
BITMAPINFOHEADER bi; //位图文件头结构
LPBITMAPINFOHEADER lpbi; //位图信息头结构
HANDLE fh, hDib, hPal,hOldPal=NULL; //指向位图信息头结构,定义文件，分配内存句柄，调色板句柄
//计算位图文件每个像素所占字节数
hDC = CreateDC("DISPLAY",NULL,NULL,NULL);
iBits = GetDeviceCaps(hDC, BITSPIXEL) *
GetDeviceCaps(hDC, PLANES);
DeleteDC(hDC);
if (iBits <= 1)
wBitCount = 1;
else if (iBits <= 4)
wBitCount = 4;
else if (iBits <= 8)
wBitCount = 8;
else if (iBits <= 24)
wBitCount = 24;
//计算调色板大小
if (wBitCount <= 8)
dwPaletteSize = (1 << wBitCount) *sizeof(RGBQUAD);
//设置位图信息头结构
GetObject(hBitmap, sizeof(BITMAP), (LPSTR)&Bitmap);
bi.biSize = sizeof(BITMAPINFOHEADER);
bi.biWidth = Bitmap.bmWidth;
bi.biHeight = Bitmap.bmHeight;
bi.biPlanes = 1;
bi.biBitCount = wBitCount;
bi.biCompression = BI_RGB;
bi.biSizeImage = 0;
bi.biXPelsPerMeter = 0;
bi.biYPelsPerMeter = 0;
bi.biClrUsed = 0;
bi.biClrImportant = 0;
dwBmBitsSize = ((Bitmap.bmWidth *
wBitCount+31)/32)* 4
*Bitmap.bmHeight ;
//为位图内容分配内存
hDib = GlobalAlloc(GHND,dwBmBitsSize+
dwPaletteSize+sizeof(BITMAPINFOHEADER));
lpbi = (LPBITMAPINFOHEADER)GlobalLock(hDib);
*lpbi = bi;
// 处理调色板
hPal = GetStockObject(DEFAULT_PALETTE);
if (hPal)
{
hDC = ::GetDC(NULL);
hOldPal = SelectPalette(hDC, (HPALETTE)hPal, FALSE);
RealizePalette(hDC);
}
// 获取该调色板下新的像素值
GetDIBits(hDC, hBitmap, 0, (UINT) Bitmap.bmHeight,
(LPSTR)lpbi + sizeof(BITMAPINFOHEADER)+dwPaletteSize,
(LPBITMAPINFO)lpbi, DIB_RGB_COLORS);
//恢复调色板
if (hOldPal)
{
SelectPalette(hDC, (HPALETTE)hOldPal, TRUE);
RealizePalette(hDC);
::ReleaseDC(NULL, hDC);
}
//创建位图文件
fh = CreateFile(lpFileName, GENERIC_WRITE,
0, NULL, CREATE_ALWAYS,
FILE_ATTRIBUTE_NORMAL | FILE_FLAG_SEQUENTIAL_SCAN, NULL);
if (fh == INVALID_HANDLE_VALUE)
return FALSE;
// 设置位图文件头
bmfHdr.bfType = 0x4D42; // "BM"
dwDIBSize = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER) + dwPaletteSize + dwBmBitsSize;
bmfHdr.bfSize = dwDIBSize;
bmfHdr.bfReserved1 = 0;
bmfHdr.bfReserved2 = 0;
bmfHdr.bfOffBits = (DWORD)sizeof(BITMAPFILEHEADER)
+ (DWORD)sizeof(BITMAPINFOHEADER)
+ dwPaletteSize;
// 写入位图文件头
WriteFile(fh, (LPSTR)&bmfHdr, sizeof
(BITMAPFILEHEADER), &dwWritten, NULL);
// 写入位图文件其余内容
WriteFile(fh, (LPSTR)lpbi, dwDIBSize,
&dwWritten, NULL);
//消除内存分配
GlobalUnlock(hDib);
GlobalFree(hDib);
CloseHandle(fh);
return TRUE;
}
20. 如何获取局域网上计算机名及它们的IP地址
l 连接ws2_32.lib和 mpr.lib库
l #include winsock2.h
CString strTemp;
struct hostent *host;
struct in_addr *ptr; // 检索IP地址
DWORD dwScope = RESOURCE_CONTEXT;
NETRESOURCE *NetResource = NULL;
HANDLE hEnum;
WNetOpenEnum( dwScope, NULL, NULL,
NULL, &hEnum );
WSADATA wsaData;
WSAStartup(MAKEWORD(1,1),&wsaData);
if ( hEnum )
{
DWORD Count = 0xFFFFFFFF;
DWORD BufferSize = 2048;
LPVOID Buffer = new char[2048];
WNetEnumResource( hEnum, &Count,
Buffer, &BufferSize );
NetResource = (NETRESOURCE*)Buffer;
char szHostName[200];
unsigned int i;
for ( i = 0;
i < BufferSize/sizeof(NETRESOURCE);
i++, NetResource++ )
{
if ( NetResource->dwUsage ==
RESOURCEUSAGE_CONTAINER &&
NetResource->dwType ==
RESOURCETYPE_ANY )
{
if ( NetResource->lpRemoteName )
{
CString strFullName =
NetResource->lpRemoteName;
if ( 0 ==
strFullName.Left(2).Compare("////") )
strFullName =
strFullName.Right(
strFullName.GetLength()-2);
gethostname( szHostName,
strlen( szHostName ) );
host = gethostbyname(strFullName);
if(host == NULL) continue;
ptr = (struct in_addr *)
host->h_addr_list[0];
// =. 分隔开IP:211.40.35.76.
int a = ptr->S_un.S_un_b.s_b1; // 211
int b = ptr->S_un.S_un_b.s_b2; // 40
int c = ptr->S_un.S_un_b.s_b3; // 35
int d = ptr->S_un.S_un_b.s_b4; // 76
strTemp.Format("%s --> %d.%d.%d.%d",
strFullName,a,b,c,d);
AfxMessageBox(strTemp);
}
}
}
delete Buffer;
WNetCloseEnum( hEnum );
}
WSACleanup();
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