Thank your your excellent help, Mark. I have gotten everything to compile properly, and can call IExtractImage::GetLocation and IExtractImage::Extract from python on the necessary files. Even the exceptions on unknown file types seem to be handled properly.
The final problem is getting the image data into python (and using it in wxpython). The final return type is an HBITMAP, which I can see as an int in Python using PyLong_FromVoidPtr, or as a PyHANDLE in python using PyWinObject_FromHANDLE. I realize that a discussion on wxpython would be outside this group's topic, but if anyone could tell me where to start looking for a way to do this, I would greatly appreciate it. From what I can tell, wxpython/wxwindows uses the HBITMAP type internally to store images, and it appears to be a pointer to a DIB in memory. If so, it may be possible to use wx.BitmapFromBuffer, wx.BitmapFromBits, or some similar function, if I can somehow convert the HBITMAP data (instead of the handle) to a string. Thanks, Steven James On 4/19/07, Mark Hammond <[EMAIL PROTECTED]> wrote:
> I have been delving in to the process of adding support for IExtractImage to > pythonwin. I have run makegw on the necessary files, added the resulting .cpp > and .h files to com/win32comext/shell/src, added references in shell.cpp and > setup.py, and now it seems all that is left to do is implement the proper > data types which makegw did not know how to handle. (Also, if it would > help anyone, I patched my makegw to run under Python 2.5 with no regex > or regsub modules.) Excellent - please feel free to send me the patches. makegw is *very* dumb though. > I have a few questions about the next steps, for those who may have done this before: > I am left with a few lines of code in the PyIExtractImage.cpp file that look like this: > if (bPythonIsHappy && !PyObject_AsDWORD *( obpdwPriority, &pdwPriority )) bPythonIsHappy = FALSE; See above - makepy is dumb :) For now, PyInt_AsLong should work fine for a DWORD. HBITMAP should just use PyLong_FromVoidPtr (or however that is spelt), and a SIZE already has PyWinObject_FromSIZE. You will just need to correct the invalid indirections created by makegw - eg, your line above would read as: > DWORD dwPriority; > if (bPythonIsHappy && !PyInt_AsLong( obpdwPriority, (long *)&dwPriority )) bPythonIsHappy = FALSE; Also, please see the existing support for IExtractIcon - this new interface should be almost identical - just one or 2 data types appear to be different between the interfaces (HICON -> HBITMAP being the most obvious one) Cheers, Mark
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