第八章 计时器(BEEPER1)

 *-------------------------------------
BEEPER1.C -- Timer Demo Program No.
(c) Charles Petzold,
-------------------------------------*/ #include <Windows.h> #define ID_TIMER 1 LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM); int WINAPI WinMain( __in HINSTANCE hInstance
, __in_opt HINSTANCE hPrevInstance
, __in LPSTR lpCmdLine
, __in int nShowCmd )
{
static TCHAR szAppName[] = TEXT("Bepper1");
HWND hwnd;
MSG msg;
WNDCLASS wndclass; wndclass.style = CS_HREDRAW | CS_VREDRAW;
wndclass.lpfnWndProc = WndProc;
wndclass.cbClsExtra = ;
wndclass.cbWndExtra = ;
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 ;
} hwnd = CreateWindow(szAppName, TEXT("Beeper1 Timer Demo")
, WS_OVERLAPPEDWINDOW
, CW_USEDEFAULT, CW_USEDEFAULT
, CW_USEDEFAULT, CW_USEDEFAULT
, NULL, NULL, hInstance, NULL); ShowWindow(hwnd, nShowCmd);
UpdateWindow(hwnd); while (GetMessage(&msg, NULL, , ))
{
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, , NULL);
return ; case WM_TIMER:
MessageBeep(-);
fFlipFlop = !fFlipFlop;
InvalidateRect(hwnd, NULL, FALSE);
return ; case WM_PAINT:
hdc = BeginPaint(hwnd, &ps); GetClientRect(hwnd, &rc);
hBrush = CreateSolidBrush(fFlipFlop ? RGB(, , ) : RGB(, , ));
FillRect(hdc, &rc, hBrush); EndPaint(hwnd, &ps);
DeleteObject(hBrush);
return ; case WM_DESTROY:
KillTimer(hwnd, ID_TIMER);
PostQuitMessage();
return ;
} return DefWindowProc(hwnd, message, wParam, lParam);
}

BEEPER1.C

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