#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 char szAppName[] = "Beeper1";
HWND hwnd;
MSG msg;
WNDCLASSEX wndclass;
wndclass.cbSize = sizeof (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;
wndclass.hIconSm = LoadIcon (NULL, IDI_APPLICATION);
RegisterClassEx (&wndclass);
hwnd = CreateWindow (szAppName, "Beeper1 Timer Demo",
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, CW_USEDEFAULT,
CW_USEDEFAULT, CW_USEDEFAULT,
NULL, NULL, hInstance, NULL);
while (!SetTimer (hwnd, ID_TIMER, 1000, NULL))
if (IDCANCEL == MessageBox (hwnd,
"Too many clocks or timers!", szAppName,
MB_ICONEXCLAMATION | MB_RETRYCANCEL))
return FALSE;
ShowWindow (hwnd, iCmdShow);
UpdateWindow (hwnd);
while (GetMessage (&msg, NULL, 0, 0))
{
TranslateMessage (&msg);
DispatchMessage (&msg);
}
return msg.wParam;
}
LRESULT CALLBACK WndProc (HWND hwnd, UINT iMsg, WPARAM wParam, LPARAM lParam)
{
static BOOL fFlipFlop = FALSE;
HBRUSH hBrush;
HDC hdc;
PAINTSTRUCT ps;
RECT rc;
switch (iMsg)
{
case WM_TIMER :
MessageBeep (0);
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, iMsg, wParam, lParam);
}