SUCCEEDED

Provides a generic test for success on any status value. Non-negative numbers indicate success.

获取或设置一个值，该值指示生成是否已成功。

if( SUCCEEDED( InitD3D( hWnd ) ) )
{
//显示主窗口
ShowWindow( hWnd, SW_SHOWDEFAULT );
UpdateWindow( hWnd );

//进入消息循环
MSG msg;
ZeroMemory( &msg, sizeof(msg) );
while( msg.message!=WM_QUIT )
{
    if( PeekMessage( &msg, NULL, 0U, 0U, PM_REMOVE ) )
    {
        TranslateMessage( &msg );
        DispatchMessage( &msg );
    }
    else
    {
        Render(); //渲染图形
    }
}