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//获得背景色,并以背景色画刷fill控件。
// Create the background color brush only when necessary
if( m_backBrush == 0 ) {
OLE_COLOR ocBack;
HRESULT hr = get_BackColor( &ocBack ); // Get the background color
ATLASSERT( SUCCEEDED( hr ) );
COLORREF crBack; // Translate the color to a COLORREF
hr = ::OleTranslateColor( ocBack, NULL, &crBack );
ATLASSERT( SUCCEEDED( hr ) );
m_backBrush = ::CreateSolidBrush( crBack ); // Create the background brush
ATLASSERT( m_backBrush != 0 );
}