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VC++ MFC Tutorial: GDI, Metafile, m_hAttribDC, CreateEnhanced, CopyMetaFile, Free Source Code Download

 
 

Metafile Device Contexts

The CMetaFileDC class represents metafile device contexts. Metafile device contexts provide a means to draw into Windows metafiles or the new enhanced metafiles.

Metafile device contexts differ from other device contexts in a variety of ways. Most importantly, the m_hAttribDC member of a metafile device context, which would normally be set to refer to the same device as m_hDC, is set to NULL instead. Thus, calls that would retrieve information about the device context would typically fail for an object of type CMetaFileDC.

It is possible to assign a value to the m_hAttribDC member. For example, you can assign it the value of another device context that you created, which represents the screen, the printer, or another output device.

Constructing a metafile device context is a two-step process. First, the CMetaFileDC object is created; next, its Create or CreateEnhanced member functions are called.

Depending on whether you supply a filename to the Create or CreateEnhanced member functions or not, the metafile will be either file-based or memory-based. A memory-based metafile exists only temporarily.

When you are finished with drawing into the metafile, you close the metafile object by calling CMetaFileDC::Close or CMetaFileDC::CloseEnhanced (depending on the type of the metafile). These functions return a handle to a metafile object. This handle can be used, for example, in a call to CDC::PlayMetafile to play back the metafile into another device context. It can also be passed to the Windows function ::CopyMetaFile (or ::CopyEnhMetaFile) to copy the metafile to a disk file.

As soon as you call its Close or CloseEnhanced member function, you can delete the CMetaFileDC object. When you are done with using the metafile handle obtained through calling Close or CloseEnhanced, you should delete the Windows metafile object by calling DeleteMetaFile or DeleteEnhMetaFile.

Example 

Note:

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