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  • 使用计时器方法2

    第一种方法 是把WM_TIMER消息发送给正常的窗口过程。

    第二种方法 是 自己让 windows把计时器消息发送给程序中的另一个窗口过程

    回调函数:

    VOID CALLBACK TimerProc(HWND hwnd,UINT message,UINT iTimerID,DWORD dwTimer)
    {
        ....
    }  

    第一种方式调用的SetTImer函数,第四个参数一般直接为NULL

    SetTimer(hwnd,iTimerID,iMsecInterval,NULL);

    第二种方式调用的SetTimer函数,第四个参数要设定为回调函数地址

    SetTimer(hwnd,iTimerID,iMsecInterval,TimerProc);

    函数代码如下:

    /*----------------------------------------
       BEEPER2.C -- Timer Demo Program No. 2
                    (c) Charles Petzold, 1998
      ----------------------------------------*/
     
    #include <windows.h>
    
    #define ID_TIMER    1
    
    LRESULT CALLBACK WndProc   (HWND, UINT, WPARAM, LPARAM) ;
    VOID    CALLBACK TimerProc (HWND, UINT, UINT,   DWORD ) ;
    
    int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
                        PSTR szCmdLine, int iCmdShow)
    {
         static TCHAR szAppName[] = TEXT ("Beeper2") ;
         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 ("Beeper2 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)
    {
         switch (message)
         {
         case WM_CREATE:
              SetTimer (hwnd, ID_TIMER, 1000, TimerProc) ;
              return 0 ;
              
         case WM_DESTROY:
              KillTimer (hwnd, ID_TIMER) ;
              PostQuitMessage (0) ;
              return 0 ;
         }
         return DefWindowProc (hwnd, message, wParam, lParam) ;
    }
    
    VOID CALLBACK TimerProc (HWND hwnd, UINT message, UINT iTimerID, DWORD dwTime)
    {
         static BOOL fFlipFlop = FALSE ;
         HBRUSH      hBrush ;
         HDC         hdc ;
         RECT        rc ;
         
         MessageBeep (-1) ;
         fFlipFlop = !fFlipFlop ;
         
         GetClientRect (hwnd, &rc) ;
         
         hdc = GetDC (hwnd) ;
         hBrush = CreateSolidBrush (fFlipFlop ? RGB(255,0,0) : RGB(0,0,255)) ;
         
         FillRect (hdc, &rc, hBrush) ;
         ReleaseDC (hwnd, hdc) ;
         DeleteObject (hBrush) ;
    }
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  • 原文地址:https://www.cnblogs.com/xing901022/p/2751833.html
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