Re: Ole Clipboard or Drag drop of Metafile image

Thanks for the response.

Yes I looked at the MFC source.  Two things with the MFC code.  MFC's CMetafileDC class has an m_hAttribDC which is typically set to the screen's sometimes to a printer's dc. While drawing, MFC uses this m_hAttribDC as opposed to the m_hDC for measuring, setting mapmode etc.  WTL does not have this and if I am to duplicate the drawing code. I need to derive a class from CDC or from CEnhMetaFileDC and add this reference hdc and duplicate some of the code.

As to placing the enhmetafile on to the DataObject, the MFC code places a metafile rather than enhmetafile.  The code creates a metafile header structure in HGlobal, fills that structure with information about the metafile (size, handle etc..) and places that with CF_METAFILEPICT as the clipboard format.  I don;t have an enhmetafile example even in MFC.   Now, EnhMetafile is supposed to already contain the size, name and such information in addition to the metafile records & there is both clipboard format for enhanced metafile as well as a TYMED for it.  So I was hoping to do this a bit more straightforward, such as by just placing the HENHMETAFILE handle in the STGMEDIUM as part of SetData  Does not seem to work though 

Don;t know if all that made sense, but I can post the code I tried if needed.



--- On Thu, 4/15/10, Angus Comber <angus-v2qo0/[email protected]> wrote:

From: Angus Comber <angus-v2qo0/[email protected]>
Subject: Re: [wtl] Ole Clipboard or Drag drop of Metafile image
To: [email protected]
Date: Thursday, April 15, 2010, 2:00 AM







 



  


    
      
      
      In this situation I would make a MFC example and just step thru the code. You have the MFC sources do you not?



-----Original Message-----

From: "arasakumaran" <arasakumaran@ yahoo.com>

Date: Thu, 15 Apr 2010 02:44:57 

To: <wtl@yahoogroups. com>

Subject: [wtl] Ole Clipboard or Drag drop of Metafile image



I am porting some code from MFC.  I need to place a metafile ( or enhanced metafile) into the data-object being used for the drag/drop. There are IDataObject implementation samples to do this that work fine (one from Viksoe, one in Codeproject from Dunn etc. ) for text, bitmap etc.  But I don't know quite how to do this for CF_ENHMETAFILE. 



Also, MFC uses 'm_hAttributeDC' to help in some of the text/drawing functions while drawing in metafileDC  - how would I do the equivalent in WTL, the drawing code uses GetTextExtentEx, which fails in the metafile DC.



Thanks.



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