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Determining ENHMETAFILE original position on page

Posted on 2002-05-13
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Last Modified: 2013-12-03
When an EnhMetaFile is copied to the clipboard, I need to
know the position the object occupied on the page the copy
operation was done on.

What I mean is this. I use Powerpoint to create something,
then do a mark-all and copy to put it onto the clipboard.
It is copied to the clipboard as an EnhMetafile.

Is there any way an application that retrieves the
EnhMetaFile from the clipboard can determine what the
offsets were from top and left of the page(window) the
object was originally copied from.

Powerpoint seems to be able to find this data. If I mark-all, copy something, close and reopen PowerPoint, and then
paste, the object is pasted to the page exactly where it was copied from.

When I do a GetEnhMetafileHeader, I don't see anything there where the information is saved.
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Question by:keevint
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2 Comments
 
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Accepted Solution

by:
BeyondWu earned 600 total points
ID: 7007775
It depend on which application set the clipboard. :o(
I think powerpoint must set other infos in the clipboard except ENHMETAFILE. If you want to compatible with it, you should analyse the format which powerpoint setted.

For example:
When you copy to clipboard, you can use
// Register your own position format
m_myPosFormat = RegisterClipboardFormat(_T("EMF_POS"));
// ...
SetClipboardData(CF_ENHMETAFILE, hMem);

typedef _POSStruct
{
    POINT  m_point;
    // ... other infos ...
}MYCOPYPOS, * LPMYCOPYPOS;

HGLOBAL hPos = GlobalAlloc(GMEM_DDESHARE | GMEM_MOVEABLE, sizeof(MYCOPYPOS));
// Set positon info to the memory
LPMYCOPYPOS pPosFormatStruct = GlobalLock(hPos);
// set the position info to it.
pPosFormatStruct->m_point.x = ...;
//...
SetClipBoardData(m_myPosFormat, hPos);
//...

If the client of clipboard know the info, it can get it from EMF_POS format. I think the powerpoint have the same
info(it seems the "Object Discriptor" containts the inof).
0
 

Author Comment

by:keevint
ID: 7010968
Thanks for the help!  One is whether these clipboard formats such as "object descriptor" are documented
somewhere ?  Thanks
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