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 A window application will enter the idle time if there is no message waiting for processing. So how to utilize this interval time to do opearions.

Generally, a window message loop is like this:

while(GetMessagee(&

msg,NULL,NULL,NULL)

...

{

   TranslateMessage(&msg);

   DispatchMessage(&msg);

}

If we didn't receive any system message, we can use this "spare time" of our application to do some background processing and even do some stuff. This process is called Idle Processing. We need to insert our message loop right after the initialization of our global variables.

while

( TRUE )

...

{

    MSG msg;

    if( PeekMessage( &msg, NULL, 0, 0, PM_REMOVE ) )

    ...{

        // Check for a quit message

        if( msg.message == WM_QUIT )

            break;

        TranslateMessage( &msg );

        DispatchMessage( &msg );

    }

    else

    ...{

        ProcessIdle();

    }

}

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