Системный таймер

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Oleg_Gashev (2002-04-14 02:11) [8]

Although the following example also creates a mousetrap, it processes the WM_TIMER message through the application-defined callback function MyTimerProc, rather than through the application"s message queue.

UINT uResult; // SetTimer"s return value
HICON hIcon1; // icon handle
POINT ptOld; // previous cursor location
HINSTANCE hinstance; // handle of current instance

//
// Perform application initialization here.
//

wc.hIcon = LoadIcon(hinstance, MAKEINTRESOURCE(400));
wc.hCursor = LoadCursor(hinstance, MAKEINTRESOURCE(200));

// Record the current cursor position.

GetCursorPos(&ptOld);

// Set the timer for the mousetrap.

uResult = SetTimer(hwnd, // handle of main window
IDT_MOUSETRAP, // timer identifier
10000, // 10-second interval
(TIMERPROC) MyTimerProc); // timer callback

if (uResult == 0)
{
ErrorHandler("No timer is available.");
}

LONG APIENTRY MainWndProc(
HWND hwnd, // handle of main window
UINT message, // type of message
UINT wParam, // additional information
LONG lParam) // additional information

{

HDC hdc; // handle of device context

switch (message)
{
//
// Process other messages.
//

case WM_DESTROY:
// Destroy the timer.

KillTimer(hwnd, IDT_MOUSETRAP);
PostQuitMessage(0);
break;

//
// Process other messages.
//

}

// MyTimerProc is an application-defined callback function that
// processes WM_TIMER messages.

VOID CALLBACK MyTimerProc(
HWND hwnd, // handle of window for timer messages
UINT message, // WM_TIMER message
UINT idTimer, // timer identifier
DWORD dwTime) // current system time
{

RECT rc;
POINT pt;

// If the window is minimized, compare the current
// cursor position with the one from 10 seconds earlier.
// If the cursor position has not changed, move the
// cursor to the icon.

if (IsIconic(hwnd))
{
GetCursorPos(&pt);

if ((pt.x == ptOld.x) && (pt.y == ptOld.y))
{
GetWindowRect(hwnd, &rc);
SetCursorPos(rc.left, rc.top);
}
else
{
ptOld.x = pt.x;
ptOld.y = pt.y;
}
}
}

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