Programming Windows程式开发设计指南->第八章 例子程序1

 /*_############################################################################
  _##
  _##  Programming Windows程式开发设计指南->第八章 例子程序1
  _##  Author: xwlee                        
  _##  Time: 2007.06.26
  _##  Chang'an University
  _##  Development condition: win2003 Server+VC6.0
  _##
  _##  程序8-1  BEEPER1
  _##  BEEPER1.C 文件
  _##  简单的定时器：一个例子
  _##  程序只是进行验证
  _## 
  _##
  _##      BEEPER1.C  -- Timer Demo Program No. 1
  _##     (c) Charles Petzold, 1998
  _##  
  _##########################################################################*/
#include <windows.h>
#define ID_TIMER    1

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

int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
                                          PSTR szCmdLine, int iCmdShow)
{
       static TCHAR        szAppName[] = TEXT ("Beeper1") ;
       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 ("Program requires Windows NT!"),
                                                 szAppName, MB_ICONERROR) ;
              return 0 ;
       }
    
       hwnd = CreateWindow (       szAppName, TEXT ("Beeper1 Timer Demo"),
                               WS_OVERLAPPEDWINDOW,
                      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 BOOL   fFlipFlop = FALSE ;
       HBRUSH                     hBrush ;
       HDC                          hdc ;
       PAINTSTRUCT ps ;
       RECT        rc ;

       switch (message)
     {
          case       WM_CREATE:
                     SetTimer (hwnd, ID_TIMER, 1000, NULL) ;
                     return 0 ;

          case       WM_TIMER :
                     //MessageBeep (110 ) ; 
      Beep(2000, 50);
                    
      fFlipFlop = !fFlipFlop ;

                     InvalidateRect (hwnd, NULL, FALSE) ;

                     return 0 ;

         

          case       WM_PAINT :

                     hdc = BeginPaint (hwnd, &ps) ;

         

                     GetClientRect (hwnd, &rc) ;

                     hBrush = CreateSolidBrush (fFlipFlop ? RGB(255,0,0) : RGB(0,0,255)) ;

                     FillRect (hdc, &rc, hBrush) ;

              EndPaint (hwnd, &ps) ;

             DeleteObject (hBrush) ;

                     return 0 ;

         

          case       WM_DESTROY :

                     KillTimer (hwnd, ID_TIMER) ;

                     PostQuitMessage (0) ;

                  return 0 ;

          }

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

}