Timing

to create a timer, use:

UNIT SetTimer(HWND hWnd, // window handle

UNIT nIDEvent, // timer id

UNIT uElapse, // millisecond delay

TIMERPROC lpTimerFunc); // callback addr

· if the timer creates successfully it returns timerID, else 0

· to send msgs to WinProc, set callback to NULL

· once created, timer will send WM_TIME msg every interval, wparam will contain timer ID

· destroy what you create when you’re done

o KillTimer(hwnd, nIDEvent,); // deallocate timer

EX:

#define T1_SECOND 1

#define T3_SECOND 2

case WM_CREATE // create 1 & 3 second timer

{ SetTimer((hwnd, T1_SECOND, 1000, NULL);

SetTimer((hwnd, T3_SECOND, 3000, NULL);

// …

return(0);

}

case WM_TIMER

{ switch(wparam)

{ case T1_SECOND:

{ …} break;

case T3_SECOND:

{ …} break;

}

}

case WM_DESTROY

{ KillTimer(hwnd, T1_SECOND,); // deallocate timer

KillTimer(hwnd, T3_SECOND,); // deallocate timer

}

manual timers can be created using:

DWORD start = GetTickCount();

// delay 100 ms

while (GetTickCount() – start < 100);