WINDOWS程序设计示例：输出文字

在对话框中显示输出文字，并利用卷动列进行查看文本内容。

 

#include <windows.h>
#include "Sysmets.h"

LRESULT CALLBACK WndProc (HWND,UINT,WPARAM,LPARAM);

int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,LPSTR szCmdLine,int iCmdShow)
{
 static TCHAR szAppName[] = TEXT("Sysmets1");
 HWND hwnd;
 MSG msg;
 WNDCLASS wndclass;
 wndclass.style = CS_HREDRAW|CS_VREDRAW;
 wndclass.lpfnWndProc = WndProc;
 wndclass.cbClsExtra = 0;
 wndclass.cbWndExtra = 0;
 wndclass.hInstance = hInstance;
 wndclass.hIcon = LoadIcon(NULL,IDI_APPLICATION);
 wndclass.hCursor = LoadCursor(NULL,IDC_ARROW);
 wndclass.hbrBackground = (HBRUSH) GetStockObject(WHITE_BRUSH);
 wndclass.lpszMenuName = NULL;
 wndclass.lpszClassName = szAppName;

 if(!RegisterClass(&wndclass))
 {
  MessageBox(NULL,TEXT("This program requires windows NT!"),szAppName,MB_ICONERROR);
  return 0;
 }

 hwnd = CreateWindow(szAppName,TEXT("Get System Metrics No.1"),
  WS_OVERLAPPEDWINDOW | WS_VSCROLL | WS_HSCROLL,
  CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,
  NULL,NULL,hInstance,NULL);

 ShowWindow(hwnd,iCmdShow);
 UpdateWindow(hwnd);

 while(GetMessage(&msg,NULL,0,0))
 {
  TranslateMessage(&msg);
  DispatchMessage(&msg);
 }
 return msg.wParam;
}

LRESULT CALLBACK WndProc (HWND hwnd,UINT message,WPARAM wParam,LPARAM lParam)
{
 static int cxChar,cxCaps,cyChar,cxClient,cyClient,iMaxWidth;
 HDC hdc;
 int i,x,y,iVertPos,iHorzPos,iPaintBeg,iPaintEnd;
 PAINTSTRUCT ps;
 SCROLLINFO si;
 TCHAR szBuffer[10];
 TEXTMETRIC tm;

 switch(message)
 {
 case WM_CREATE:
  hdc = GetDC(hwnd);
  GetTextMetrics(hdc,&tm);
  cxChar = tm.tmAveCharWidth;
  cxCaps = (tm.tmPitchAndFamily & 1?3:2)*cxChar/2;
  cyChar = tm.tmHeight + tm.tmExternalLeading;

  ReleaseDC(hwnd,hdc);

  iMaxWidth = 22*cxCaps+40*cxChar;
  return 0;

 case WM_SIZE:
  cxClient = LOWORD(lParam);
  cyClient = HIWORD(lParam);

  si.cbSize = sizeof(si);
  si.fMask = SIF_RANGE|SIF_PAGE;
  si.nMin = 0;
  si.nMax = NUMLINES -1;
  si.nPage = cyClient/cyChar;
  SetScrollInfo(hwnd,SB_VERT,&si,TRUE);

  si.cbSize = sizeof(si);
  si.fMask = SIF_RANGE|SIF_PAGE;
  si.nMin = 0;
  si.nMax = 2+iMaxWidth/cxChar;
  si.nPage = cxClient/cxChar;
  SetScrollInfo(hwnd,SB_HORZ,&si,TRUE);
  return 0;
 case WM_VSCROLL:
  si.cbSize = sizeof(si);
  si.fMask = SIF_ALL;
  GetScrollInfo(hwnd,SB_VERT,&si);
  iVertPos = si.nPos;
  switch(LOWORD(wParam))
  {
  case SB_TOP:
   si.nPos = si.nMin;
   break;
  case SB_BOTTOM:
   si.nPos = si.nMax;
   break;
  case SB_LINEUP:
   si.nPos-= 1;
   break;
  case SB_LINEDOWN:
   si.nPos += 1;
   break;
  case SB_PAGEUP:
   si.nPos -= si.nPage;
   break;
  case SB_PAGEDOWN:
   si.nPos += si.nPage;
   break;
                                   /*如果处理SB_THUMBTRACK 讯息，在使用者拖动卷动方块时您需要移动
                                            显示区域的内容。而如果处理SB_THUMBPOSITION 讯息，则只需在使用者停止拖
                                             动卷动方块时移动显示区域的内容。*/
  case SB_THUMBTRACK:
   si.nPos = si.nTrackPos;
   break;
  default:
   break;
  }
  si.fMask = SIF_POS;
  SetScrollInfo(hwnd,SB_VERT,&si,TRUE);
  GetScrollInfo(hwnd,SB_VERT,&si);
  if(si.nPos != iVertPos)
  {
   ScrollWindow(hwnd,0,cyChar*(iVertPos-si.nPos),NULL,NULL);
   UpdateWindow(hwnd);
  }
  return 0;
 case WM_HSCROLL:
  si.cbSize = sizeof(si);
  si.fMask = SIF_ALL;
  GetScrollInfo(hwnd,SB_HORZ,&si);
  iHorzPos = si.nPos;

  switch(LOWORD(wParam))
  {
  case SB_LINELEFT:
   si.nPos -= 1;
   break;
  case SB_LINERIGHT:
   si.nPos += 1;
   break;
  case SB_PAGELEFT:
   si.nPos -= si.nPage;
   break;
  case SB_PAGERIGHT:
   si.nPos += si.nPage;
   break;
  case SB_THUMBPOSITION:
   si.nPos = si.nTrackPos;
   break;
  default:
   break;
  }
  si.fMask = SIF_POS;
  SetScrollInfo(hwnd,SB_HORZ,&si,TRUE);
  GetScrollInfo(hwnd,SB_HORZ,&si);
  if(si.nPos != iHorzPos)
  {
   ScrollWindow(hwnd,cxChar*(iHorzPos-si.nPos),0,NULL,NULL);
  }
  return 0;
 case WM_PAINT:
  hdc = BeginPaint(hwnd,&ps);
  si.cbSize = sizeof(si);
  si.fMask = SIF_POS;
  GetScrollInfo(hwnd,SB_VERT,&si);
  iVertPos = si.nPos;
  GetScrollInfo(hwnd,SB_HORZ,&si);
  iHorzPos = si.nPos;
  iPaintBeg = max(0,iVertPos+ps.rcPaint.top/cyChar);
  iPaintEnd = min(NUMLINES-1,iVertPos+ps.rcPaint.bottom/cyChar);
  for(i=iPaintBeg;i<=iPaintEnd;i++)
  {
   x = cxChar*(1-iHorzPos);
   y = cyChar*(i-iVertPos);
   TextOut(hdc,x,y,sysmetrics[i].szLabel,lstrlen(sysmetrics[i].szLabel));
   TextOut(hdc,x+22*cxCaps,y,sysmetrics[i].szDesc,lstrlen(sysmetrics[i].szDesc));
   SetTextAlign(hdc,TA_RIGHT|TA_TOP);
   TextOut(hdc,x+22*cxCaps+40*cxChar,y,szBuffer,wsprintf(szBuffer,TEXT("%5d"),GetSystemMetrics(sysmetrics[i].Index)));
   SetTextAlign(hdc,TA_LEFT|TA_TOP);
  }
  EndPaint(hwnd,&ps);
  return 0;
 case WM_DESTROY:
  PostQuitMessage(0);
  return 0;
 }
 return DefWindowProc(hwnd,message,wParam,lParam);
}

 

 

#define NUMLINES ((int)(sizeof(sysmetrics)/sizeof(sysmetrics[0])))

struct
{
 int Index;
 TCHAR *szLabel;
 TCHAR *szDesc;
}

sysmetrics[] =
{
 SM_CXSCREEN,TEXT("SM_CXSCREEN"),TEXT("Screen width in pixels"),
 SM_CYSCREEN,TEXT ("SM_CYSCREEN"),TEXT ("Screen height in pixels"),
 SM_CXVSCROLL,TEXT ("SM_CXVSCROLL"),TEXT ("Vertical scroll width"),
 SM_CYHSCROLL, TEXT ("SM_CYHSCROLL"),TEXT ("Horizontal scroll height"),
 SM_CYCAPTION, TEXT ("SM_CYCAPTION"),TEXT ("Caption bar height"),
 SM_CXBORDER, TEXT ("SM_CXBORDER"),TEXT ("Window border width"),
 SM_CYBORDER, TEXT ("SM_CYBORDER"),TEXT ("Window border height"),
 SM_CXFIXEDFRAME,TEXT ("SM_CXFIXEDFRAME"),TEXT ("Dialog window frame width"),
 SM_CYFIXEDFRAME,TEXT ("SM_CYFIXEDFRAME"),TEXT ("Dialog window frame height"),
 SM_CYVTHUMB, TEXT ("SM_CYVTHUMB"),TEXT ("Vertical scroll thumb height"), 
 SM_CXHTHUMB, TEXT ("SM_CXHTHUMB"),TEXT ("Horizontal scroll thumb width"),
 SM_CXICON, TEXT ("SM_CXICON"),TEXT ("Icon width"),
 SM_CYICON, TEXT ("SM_CYICON"),TEXT ("Icon height"),
 SM_CXCURSOR, TEXT ("SM_CXCURSOR"),TEXT ("Cursor width"),
 SM_CYCURSOR, TEXT ("SM_CYCURSOR"),TEXT ("Cursor height"),
 SM_CYMENU, TEXT ("SM_CYMENU"),TEXT ("Menu bar height"),
 SM_CXFULLSCREEN,TEXT ("SM_CXFULLSCREEN"),TEXT ("Full screen client area width"),
 SM_CYFULLSCREEN,TEXT ("SM_CYFULLSCREEN"),TEXT ("Full screen client area height"),
 SM_CYKANJIWINDOW,TEXT ("SM_CYKANJIWINDOW"),TEXT ("Kanji window height"),
 SM_MOUSEPRESENT, TEXT ("SM_MOUSEPRESENT"),TEXT ("Mouse present flag"),
 SM_CYVSCROLL, TEXT ("SM_CYVSCROLL"),TEXT ("Vertical scroll arrow height"),
 SM_CXHSCROLL, TEXT ("SM_CXHSCROLL"),TEXT ("Horizontal scroll arrow width"),
 SM_DEBUG, TEXT ("SM_DEBUG"),TEXT ("Debug version flag"),
 SM_SWAPBUTTON, TEXT ("SM_SWAPBUTTON"),TEXT ("Mouse buttons swapped flag"),
 SM_CXMIN, TEXT ("SM_CXMIN"),TEXT ("Minimum window width"),
 SM_CYMIN, TEXT ("SM_CYMIN"),TEXT ("Minimum window height"),
 SM_CXSIZE, TEXT ("SM_CXSIZE"),TEXT ("Min/Max/Close button width"),
 SM_CYSIZE, TEXT ("SM_CYSIZE"),TEXT ("Min/Max/Close button height"),
 SM_CXSIZEFRAME, TEXT ("SM_CXSIZEFRAME"),TEXT ("Window sizing frame width"),
 SM_CYSIZEFRAME, TEXT ("SM_CYSIZEFRAME"),TEXT ("Window sizing frame height"),
 SM_CXMINTRACK, TEXT ("SM_CXMINTRACK"),TEXT ("Minimum window tracking width"),
 SM_CYMINTRACK, TEXT ("SM_CYMINTRACK"),TEXT ("Minimum window tracking height"),
 SM_CXDOUBLECLK, TEXT ("SM_CXDOUBLECLK"),TEXT ("Double click x tolerance"),
 SM_CYDOUBLECLK, TEXT ("SM_CYDOUBLECLK"),TEXT ("Double click y tolerance"),
 SM_CXICONSPACING,TEXT ("SM_CXICONSPACING"),TEXT ("Horizontal icon spacing"),
 SM_CYICONSPACING,TEXT ("SM_CYICONSPACING"),TEXT ("Vertical icon spacing"),
 SM_MENUDROPALIGNMENT, TEXT ("SM_MENUDROPALIGNMENT"),TEXT ("Left or right menu drop"),
 SM_PENWINDOWS, TEXT ("SM_PENWINDOWS"),TEXT ("Pen extensions installed"),
 SM_DBCSENABLED, TEXT ("SM_DBCSENABLED"),TEXT ("Double-Byte Char Set enabled"),
 SM_CMOUSEBUTTONS, TEXT ("SM_CMOUSEBUTTONS"),TEXT ("Number of mouse buttons"),
 SM_SECURE, TEXT ("SM_SECURE"),TEXT ("Security present flag"),
 SM_CXEDGE, TEXT ("SM_CXEDGE"),TEXT ("3-D border width"),
 SM_CYEDGE, TEXT ("SM_CYEDGE"),TEXT ("3-D border height"),
 SM_CXMINSPACING, TEXT ("SM_CXMINSPACING"),TEXT ("Minimized window spacing width"),
 SM_CYMINSPACING, TEXT ("SM_CYMINSPACING"),TEXT ("Minimized window spacing height"),
 SM_CXSMICON, TEXT ("SM_CXSMICON"),TEXT ("Small icon width"),
 SM_CYSMICON, TEXT ("SM_CYSMICON"),TEXT ("Small icon height"),
 SM_CYSMCAPTION, TEXT ("SM_CYSMCAPTION"),TEXT ("Small caption height"),
 SM_CXSMSIZE, TEXT ("SM_CXSMSIZE"),TEXT ("Small caption button width"),
 SM_CYSMSIZE, TEXT ("SM_CYSMSIZE"),TEXT ("Small caption button height"),
 SM_CXMENUSIZE, TEXT ("SM_CXMENUSIZE"),TEXT ("Menu bar button width"),
 SM_CYMENUSIZE, TEXT ("SM_CYMENUSIZE"),TEXT ("Menu bar button height"),
 SM_ARRANGE, TEXT ("SM_ARRANGE"),TEXT ("How minimized windows arranged"),
 SM_CXMINIMIZED, TEXT ("SM_CXMINIMIZED"),TEXT ("Minimized window width"),
 SM_CYMINIMIZED, TEXT ("SM_CYMINIMIZED"),TEXT ("Minimized window height"),
 SM_CXMAXTRACK, TEXT ("SM_CXMAXTRACK"),TEXT ("Maximum draggable width"),
 SM_CYMAXTRACK, TEXT ("SM_CYMAXTRACK"),TEXT ("Maximum draggable height"),
 SM_CXMAXIMIZED, TEXT ("SM_CXMAXIMIZED"),TEXT ("Width of maximized window"),
 SM_CYMAXIMIZED, TEXT ("SM_CYMAXIMIZED"),TEXT ("Height of maximized window"),
 SM_NETWORK, TEXT ("SM_NETWORK"),TEXT ("Network present flag"),
 SM_CLEANBOOT, TEXT ("SM_CLEANBOOT"),TEXT ("How system was booted"),
 SM_CXDRAG, TEXT ("SM_CXDRAG"),TEXT ("Avoid drag x tolerance"),
 SM_CYDRAG, TEXT ("SM_CYDRAG"),TEXT ("Avoid drag y tolerance"),
 SM_SHOWSOUNDS, TEXT ("SM_SHOWSOUNDS"),TEXT ("present sounds visually"),
 SM_CXMENUCHECK, TEXT ("SM_CXMENUCHECK"),TEXT ("menu check-mark width"),
 SM_CYMENUCHECK, TEXT ("SM_CYMENUCHECK"),TEXT ("menu check-mark height"),
 SM_SLOWMACHINE, TEXT ("SM_SLOWMACHINE"),TEXT ("slow processor flag"),
 SM_MIDEASTENABLED, TEXT ("SM_MIDEASTENABLED"),TEXT ("Hebrew and Arabic enabled flag"),
 SM_MOUSEWHEELPRESENT, TEXT ("SM_MOUSEWHEELPRESENT"),TEXT ("Mouse wheel present flag"),
 SM_XVIRTUALSCREEN, TEXT ("SM_XVIRTUALSCREEN"),TEXT ("Virtual screen x origin"),
 SM_YVIRTUALSCREEN, TEXT ("SM_YVIRTUALSCREEN"),TEXT ("Virtual screen y origin"),
 SM_CXVIRTUALSCREEN, TEXT ("SM_CXVIRTUALSCREEN"),TEXT ("Virtual screen width"),
 SM_CYVIRTUALSCREEN, TEXT ("SM_CYVIRTUALSCREEN"),TEXT ("Virtual screen height"),
 SM_CMONITORS, TEXT ("SM_CMONITORS"),TEXT ("Number of monitors"),
 SM_SAMEDISPLAYFORMAT, TEXT ("SM_SAMEDISPLAYFORMAT"),TEXT ("Same color format flag")
} ;