PyIStream and COM question for WinGraphViz

[Mark Hammond]

Simon Frost wrote:

> Dear Python List,
> 
> I'd like to write a COM interface to WinGraphViz 
> (http://home.so-net.net.tw/oodtsen/wingraphviz/). I would like to dump 
> my image to a PyIStream, but I can't find any documentation on how to do 
> this.
> 
> Here's the syntax for the COM interface
> 
> ProgramID: WinGraphviz.BinaryImage
>  Dump(IStream stream) as Boolean
> 
> I would like to do something like
> istream=PyIStream(...)
> myBinaryImage.Dump(istream)
> 
> and then go on to display the image.
> 
> Any help would be greatly appreciated.

Presumably this is a method on the COM object.  You want to create a 
stream object, pass it to the library, and have it "dump" to your object?

If so, check our win32com\test\testStreams for examples of Python 
implemented IStream interfaces.

Mark