Repaint

I'm trying to have my program repaint in a loop, but it only waits until the loop is done to redraw. Here's my code:

Code:

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while( ftell( fIn ) < fileSize ) {

        ZeroMemory( pszBuffer, 512 );

        fread( pszBuffer, 512, sizeof( char ), fIn );

        //do stuff

        fwrite( pszBuffer, 512, sizeof( char ), fOut );

        setProgress( progress + 512 );
       
        RECT rect;
        GetWindowRect(hWnd, &rect);
        InvalidateRect(hWnd, &rect, true);

}

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Basically you're posting a WM_PAINT message with InvalidateRect, however you are still doing stuff in a loop so the message isn't being processed. If this is in another thread then the code would probably work.