           break;
        case GSDLL_SIZE:
            fprintf(stdout,"Callback: SIZE %p width=%d height=%d\n", str,
                (int)(count &amp; 0xffff), (int)((count&gt;&gt;16) &amp; 0xffff) );
            break;
        case GSDLL_POLL:
            return 0; /* no error */
        default:
            fprintf(stdout,"Callback: Unknown message=%d\n",message);
            break;
    }
    return 0;
}
</pre>

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