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Client-Area Device Contex

The CClientDC class is used to create a device context object corresponding to the client area of a given window. The constructor and destructor of CClientDC encapsulate calls to the GetDC and ReleaseDC functions. CClientDC objects are most often used when drawing into a device context is required outside an OnDraw function.

A particular use of CClientDC objects concerns mapping modes. Sometimes, it is necessary for an application to translate logical coordinates into physical coordinates or vice versa even when no actual drawing is performed. In these situations, it is a frequently used practice to create a CClientDC object for the sole purpose of being able to use one of its coordinate transformation functions. For example:

CClientDC dc(myView);

myView->OnPrepareDC(&dc);

dc.LPtoDP(&point);

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