8b 计时器 通过为SetTimer指定回调函数地址来出来计时器信息 实现同样功能

8b 计时器 通过为SetTimer指定回调函数地址来出来计时器信息 实现同样功能

#include <windows.h>#define ID_TIMER 1LRESULT 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) ;}