How to use Win32 API with Python?

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PyWin32 is the way to go – but how to use it? One approach is to begin with a concrete problem you’re having and attempting to solve it. PyWin32 provides bindings for the Win32 API functions for which there are many, and you really have to pick a specific goal first.

In my Python 2.5 installation (ActiveState on Windows) the win32 package has a Demos folder packed with sample code of various parts of the library.

For example, here’s CopyFileEx.py:

import win32file, win32api
import os


def ProgressRoutine(TotalFileSize, TotalBytesTransferred, StreamSize, StreamBytesTransferred,
    StreamNumber, CallbackReason, SourceFile, DestinationFile, Data):
    print Data
    print TotalFileSize, TotalBytesTransferred, StreamSize, StreamBytesTransferred, StreamNumber, CallbackReason, SourceFile, DestinationFile
    ##if TotalBytesTransferred > 100000:
    ##    return win32file.PROGRESS_STOP
    return win32file.PROGRESS_CONTINUE

temp_dir=win32api.GetTempPath()
fsrc=win32api.GetTempFileName(temp_dir,'cfe')[0]
fdst=win32api.GetTempFileName(temp_dir,'cfe')[0]
print fsrc, fdst

f=open(fsrc,'w')
f.write('xxxxxxxxxxxxxxxx\n'*32768)
f.close()
## add a couple of extra data streams
f=open(fsrc+':stream_y','w')
f.write('yyyyyyyyyyyyyyyy\n'*32768)
f.close()
f=open(fsrc+':stream_z','w')
f.write('zzzzzzzzzzzzzzzz\n'*32768)
f.close()

operation_desc="Copying "+fsrc+' to '+fdst
win32file.CopyFileEx(fsrc, fdst, ProgressRoutine, operation_desc, False,   win32file.COPY_FILE_RESTARTABLE)

It shows how to use the CopyFileEx function with a few others (such as GetTempPath and GetTempFileName). From this example you can get a “general feel” of how to work with this library.

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