Code:
void updateclient(HWND hWnd)
{ static int i = 0;
char str[20];
HDC hDcPaint;
PAINTSTRUCT ps;
hDcPaint = BeginPaint(hWnd, &ps);
// BitBlt(hDcPaint, ps.rcPaint.left, ps.rcPaint.top, ps.rcPaint.right, ps.rcPaint.bottom,
// hMemdc, ps.rcPaint.left, ps.rcPaint.top, SRCCOPY);
Rectangle(hDcPaint, 50, 50, 220, 220);
_itoa(ps.rcPaint.top+i, str, 10);
TextOut(hDcPaint, 110, 60, str, strlen(str));
_itoa(ps.rcPaint.left, str, 10);
TextOut(hDcPaint, 60, 120, str, strlen(str));
_itoa(ps.rcPaint.right, str, 10);
TextOut(hDcPaint, 150, 120, str, strlen(str));
_itoa(ps.rcPaint.bottom, str, 10);
TextOut(hDcPaint, 110, 170, str, strlen(str));
_itoa(i, str, 10);
TextOut(hDcPaint, 110, 190, str, strlen(str));
EndPaint(hWnd, &ps);
i++;
}