DoEvents equivalent for C++?

Question

I\'m new to native c++. Right now, I made it so when I press the left mouse button, it has a for loop that does InvalidateRect and draws a rectangle, and increments X by the

Answer 1

DoEvents basically translates as:

void DoEvents()
{
    MSG msg;
    BOOL result;

    while ( ::PeekMessage(&msg, NULL, 0, 0, PM_NOREMOVE ) )
    {
        result = ::GetMessage(&msg, NULL, 0, 0);
        if (result == 0) // WM_QUIT
        {                
            ::PostQuitMessage(msg.wParam);
            break;
        }
        else if (result == -1)
        {
             // Handle errors/exit application, etc.
        }
        else 
        {
            ::TranslateMessage(&msg);
            :: DispatchMessage(&msg);
        }
    }
}

Answer 2

I am a bit rusty in Win32 API, but the asynchronous way of doing this would be:

• Invalidate the rect
• Set a timer (see below) to send a message after 50ms
• Return to the event loop to let WM_PAINT events happen
• On receiving the timer message, move the rect, then repeat

This way integrates nicely with being event driven. I realize this is not exactly what you ask for, but I thought I'd mention it as a possible solution anyway :)

EDIT: A quick google turns up the Windows API call [SetTimer](http://msdn.microsoft.com/en-us/library/ms644906(VS.85,loband).aspx) which you can use to facilitate this. The message will be a WM_TIMER one.