Diagram Preview

[Nikolay]

How do I generate a small diagram "preview" (thumbnail) picture programmatically (you can see those in explorer, for example)?
Supposing I have either a Visio file on disk, or a Visio Document object (not sure which one might be a better starting point)

I can see following options:
- Grab thumbnail data from explorer using some shell api (which one?)
- Export drawing to some manageable vector format, then resize (which format? wmf/emf? how to preserve background?)

As a result, I want a fixed-size bitmap (say, 64x64)
Thanks in advance!

[Jumpy]

Check out
ActiveDocument.PreviewPicture
in the help.

I don't understand everything they say there, but it seems to be sth. with emf file.
Maybe you can make more sense of what is said there.

[Nikolay]

Thanks! I'll definitely give it a try.

[aledlund]

I use something like this in my vba code

docCopy.SavePreviewMode = visSavePreviewDraft1st
docCopy.SaveAsEx strCopy, visSaveAsWS
DoEvents
docCopy.Close
DoEvents

al

[Nikolay]

Thanks al, but doesn't this code save document with preview picture?
I don't actually need to save document with preview picture; I need the document preview picture itself

It seems that Document.PreviewPicture did the trick pretty well, and the only thing left to me were the boring technical details:

IPicture pic = (IPicture)doc.PreviewPicture;
Image img = new Metafile((IntPtr)pic.Handle, true);

[JuneTheSecond]

Cool!
Your solution is valuable to me, too.
Thank you.

[aledlund]

sorry about that! I obviously misunderstood what you were attempting to do 
al