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VC++: How would you convert a handle into a pointer?

Yashavant Kanetkar

December 26, 2007

How would you convert a handle into a pointer?

Very often we get a handle of an object and we need to convert it to a pointer to that object. For this FromHandle( ) function can be used. Following code snippets show how to get a pointer to different classes from a handle.

HBRUSH hb = ( HBRUSH ) GetStockObject ( BLACK_BRUSH ) ;
CBrush *b = CBrush::FromHandle ( hb ) ; 
HDC hdc = ::GetDC ( NULL ) ;
CDC* pDC = CDC::FromHandle ( hdc ) ; 
CWnd *pWnd = ( CWnd * ) ::FromHandle ( m_hWnd ) ;