Am 20.01.2012 15:50, schrieb Éric Piel: > Hello, > > I'm in a similar situation of what was described previously in this thread: > http://sourceforge.net/mailarchive/message.php?msg_id=25175351 > > I need to send a pointer to a buffer which will be filled by the method > as output. The IDL looks like this: > HRESULT GetImage([in] long lSize, [out, size_is(size)] BYTE *pbImage) > > With the SVN head of comtypes, it's fairly easy to handle, but I still > need to do two things: > * Change the generated python class to force pbImage to be 'in' and not > 'out' > * Cast my buffer variable to look like a pointer to a byte, and not an > array: > buffer = (c_ubyte * num_bytes)() > c.GetImage(num_bytes, cast(pointer(buffer), POINTER(c_ubyte))) > > So my question: is this the right way to do it?
Yes, it seems so. If it works, I can't test this now. > Would it be possible to modify comptypes to make it easier? > * Could it be possible to have the tlb parser to detect this case and > put the parameter as 'in' instead of 'out'? No. As I said in the thread that you mentioned, the tlb parser cannot detect this case since the 'size_is()' info is simply not present in the type library (the .tlb file). > * Could it be possible to support the byref() construct like: > c.GetImage(num_bytes, byref(buffer)) > For now it raises a type exception: > ArgumentError: argument 2:<type 'exceptions.TypeError'>: expected > LP_c_ubyte instance instead of pointer to c_ubyte_Array_226304 I'm not sure about this. Does 'c.GetImage(num_bytes, buffer)' work? Thomas ------------------------------------------------------------------------------ Keep Your Developer Skills Current with LearnDevNow! The most comprehensive online learning library for Microsoft developers is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, Metro Style Apps, more. Free future releases when you subscribe now! http://p.sf.net/sfu/learndevnow-d2d _______________________________________________ comtypes-users mailing list comtypes-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/comtypes-users
