内存绘图保存

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#pragma onceclass DrawHDCpicture{public:DrawHDCpicture(void);~DrawHDCpicture(void);static BOOL SaveBmp(HBITMAP hBitmap, CString FileName);static HBITMAP CopyDCToBitmap(HDC hScrDC, LPRECT lpRect);static void OnbuildBitmap( );static UINT GetBitmap(LPVOID );static bool running;};

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#include "StdAfx.h"#include ".\drawhdcpicture.h" #include ".\publicmember.h"bool DrawHDCpicture::running=false;DrawHDCpicture::DrawHDCpicture(void){}DrawHDCpicture::~DrawHDCpicture(void){}BOOL DrawHDCpicture::SaveBmp(HBITMAP hBitmap, CString FileName){HDC hDC; //当前分辨率下每象素所占字节数 int iBits; //位图中每象素所占字节数 WORD wBitCount; //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 DWORD dwPaletteSize=0, dwBmBitsSize=0, dwDIBSize=0, dwWritten=0; //位图属性结构 BITMAP Bitmap; //位图文件头结构 BITMAPFILEHEADER bmfHdr; //位图信息头结构 BITMAPINFOHEADER bi; //指向位图信息头结构 LPBITMAPINFOHEADER lpbi; //定义文件，分配内存句柄，调色板句柄 HANDLE fh, hDib, hPal,hOldPal=NULL; //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 wBitCount = 24; 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.biClrImportant = 0; bi.biClrUsed = 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); //hDC = m_pDc->GetSafeHdc(); 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, (BITMAPINFO *)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(FileName, 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); //清除 GlobalUnlock(hDib); GlobalFree(hDib); CloseHandle(fh); return TRUE; }HBITMAP DrawHDCpicture::CopyDCToBitmap(HDC hScrDC, LPRECT lpRect){HDC hMemDC; // 屏幕和内存设备描述表 HBITMAP hBitmap,hOldBitmap; // 位图句柄 int nX, nY, nX2, nY2; // 选定区域坐标 int nWidth, nHeight; // 位图宽度和高度 // 确保选定区域不为空矩形 if ( IsRectEmpty( lpRect ) ) return NULL; // 获得选定区域坐标 nX=   lpRect->left; nY=   lpRect->top; nX2 = lpRect->right; nY2 = lpRect->bottom; nWidth  = nX2 - nX; nHeight = nY2 - nY; //为屏幕设备描述表创建兼容的内存设备描述表 hMemDC= CreateCompatibleDC( hScrDC ); // 创建一个与屏幕设备描述表兼容的位图 hBitmap = CreateCompatibleBitmap( hScrDC, nWidth, nHeight ); // 把新位图选到内存设备描述表中 hOldBitmap = ( HBITMAP )SelectObject( hMemDC, hBitmap ); // 把屏幕设备描述表拷贝到内存设备描述表中   BLACKNESS   WHITENESS  SRCCOPYStretchBlt( hMemDC, 0, 0, nWidth, nHeight, hScrDC, nX, nY, nWidth, nHeight, SRCCOPY );//得到屏幕位图的句柄 hBitmap = ( HBITMAP )SelectObject( hMemDC, hOldBitmap ); //清除DeleteDC( hMemDC ); DeleteObject( hOldBitmap ); //返回位图句柄 return hBitmap;}void DrawHDCpicture::OnbuildBitmap( ){int iwidth=400;int iheight=400;//CDC *pdc=GetDC();CDC *pdc=new CDC();pdc->m_hDC=::GetDC(::GetDesktopWindow());//----------------------------------------------------// 下面是创建兼容DC和兼容DC使用的CBitmap，并规定兼容// DC的绘图绘制在创建的CBitmap上。// 经过这一句：MenDC.SelectObject(&bm);以后，不管使用// MenDC绘制什么，实际上都是绘制在了CBitmap bm;这个内// 存位图上了.//----------------------------------------------------CDC MenDC; CBitmap bm;MenDC.CreateCompatibleDC( pdc ); bm.CreateCompatibleBitmap( pdc, iwidth, iheight ); //设定背景位图大小，最好是整个客户区大小MenDC.SelectObject( &bm );//----------------------------------------------------// 下面使用MenDC绘制你想要的任何东西，这里只添加了一个文本//----------------------------------------------------MenDC.SetBkColor(RGB(0,0,0));CString a;a.Format("--我们---------------%5d",::GetTickCount()%1000);MenDC.SetBkColor(RGB(255, 255, 255)); for(int i=0;i<iheight;i++)       for(int k=0;k<iwidth;k++)           MenDC.TextOut( i, k, "    "); //MenDC.SetBkMode(TRANSPARENT); MenDC.SetTextColor(RGB(255, 0, 0)); MenDC.TextOut(100, 30, "Test text");     MenDC.TextOut( 100, 100, a);    /*  MenDC.SetBkColor(RGB(0, 0, 128));  MenDC.TextOut(200, 50, "Test text");*/CPen pen(PS_SOLID, 2, RGB(0, 255, 0));  //红色画笔      CPen* pOldPen=MenDC.SelectObject(&pen);//保存原始的CPen，即黑色的CPen    MenDC.MoveTo(100,0);MenDC.LineTo(100,200);MenDC.SelectObject(pOldPen);//恢复原始的CPe        //MenDC.Ellipse  //所有绘图都在这个区间进行//----------------------------------------------------// 下面设定你要从CBitmap bm;上截取哪一部分。//----------------------------------------------------RECT rt;rt.left = 0; rt.right  = iwidth;rt.top  = 0; rt.bottom = iheight;//----------------------------------------------------HBITMAP hBmp = CopyDCToBitmap( MenDC.GetSafeHdc(), &rt ); SaveBmp( hBmp, "MM.bmp" );//----------------------------------------------------bm.DeleteObject();MenDC.DeleteDC();::ReleaseDC(PublicMember::CTS_Mainhw,pdc->m_hDC);}UINT DrawHDCpicture::GetBitmap(LPVOID ){while(running){       OnbuildBitmap();    PublicMember::CTS_DrawPic=0;   ::Sleep(2000);  }return 0;}