windows 消息循環機制

#include <windows.h>

#include <stdio.h>

LRESULT CALLBACK WinSunProc(

  HWND hwnd,      // handle to window

  UINT uMsg,      // message identifier

  WPARAM wParam,  // first message parameter

  LPARAM lParam   // second message parameter

);

int WINAPI WinMain(

  HINSTANCE hInstance,      // handle to current instance

  HINSTANCE hPrevInstance,  // handle to previous instance

  LPSTR lpCmdLine,          // command line

  int nCmdShow              // show state

)

{

 WNDCLASS wndcls;

 wndcls.cbClsExtra=0;

 wndcls.cbWndExtra=0;

 wndcls.hbrBackground=(HBRUSH)GetStockObject(BLACK_BRUSH);

 wndcls.hCursor=LoadCursor(NULL,IDC_CROSS);

 wndcls.hIcon=LoadIcon(NULL,IDI_ERROR);

 wndcls.hInstance=hInstance;

 wndcls.lpfnWndProc=WinSunProc;

 wndcls.lpszClassName="Weixin2003";

 wndcls.lpszMenuName=NULL;

 wndcls.style=CS_HREDRAW | CS_VREDRAW;

 RegisterClass(&wndcls);

 HWND hwnd;

 hwnd=CreateWindow("Weixin2003","北京維新科學技術教育訓練中心",WS_OVERLAPPEDWINDOW,

  0,0,600,400,NULL,NULL,hInstance,NULL);

 ShowWindow(hwnd,SW_SHOWNORMAL);

 UpdateWindow(hwnd);

 MSG msg;

 while(GetMessage(&msg,NULL,0,0))

 {

  TranslateMessage(&msg);

  DispatchMessage(&msg);

 }

 return 0;

}

LRESULT CALLBACK WinSunProc(

  HWND hwnd,      // handle to window

  UINT uMsg,      // message identifier

  WPARAM wParam,  // first message parameter

  LPARAM lParam   // second message parameter

)

{

 switch(uMsg)

 {

 case WM_CHAR:

  char szChar[20];

  sprintf(szChar,"char is %d",wParam);

  MessageBox(hwnd,szChar,"weixin",0);

  break;

 case WM_LBUTTONDOWN:

  MessageBox(hwnd,"mouse clicked","weixin",0);

  HDC hdc;

  hdc=GetDC(hwnd);

  TextOut(hdc,0,50,"計算機程式設計語言教育訓練",strlen("計算機程式設計語言教育訓練"));

  ReleaseDC(hwnd,hdc);

  break;

 case WM_PAINT:

  HDC hDC;

  PAINTSTRUCT ps;

  hDC=BeginPaint(hwnd,&ps);

  TextOut(hDC,0,0,"維新教育訓練",strlen("維新教育訓練"));

  EndPaint(hwnd,&ps);

  break;

 case WM_CLOSE:

  if(IDYES==MessageBox(hwnd,"是否真的結束？","weixin",MB_YESNO))

  {

   DestroyWindow(hwnd);

  }

  break;

 case WM_DESTROY:

  PostQuitMessage(0);

  break;

 default:

  return DefWindowProc(hwnd,uMsg,wParam,lParam);

 }

 return 0;

}