SelectObject

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CPen* SelectObject( CPen* pPen );

CBrush* SelectObject( CBrush* pBrush );

virtual CFont* SelectObject( CFont* pFont );

CBitmap* SelectObject( CBitmap* pBitmap );

int SelectObject( CRgn* pRgn );

Return Value

A pointer to the object being replaced. This is a pointer to an object of one of the classes derived from CGdiObject, such as CPen, depending on which version of the function is used. The return value is NULL if there is an error. This function may return a pointer to a temporary object. This temporary object is only valid during the processing of one Windows message. For more information, see CGdiObject::FromHandle.

The version of the member function that takes a region parameter performs the same task as the SelectClipRgn member function. Its return value can be any of the following:

• COMPLEXREGION   New clipping region has overlapping borders.
  
  
• ERROR   Device context or region is not valid.
  
  
• NULLREGION   New clipping region is empty.
  
  
• SIMPLEREGION   New clipping region has no overlapping borders.

Parameters

SelectObject

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原文地址：http://www.cnblogs.com/llforeverlove/p/4653958.html