danbrotherston wrote: > I am trying to get the output from the win32 platform command > OutputDebugString. I have used the following C++ code as a > guideline: > > http://groups.google.com/group/microsoft.public.vc.utilities/browse_frm/thread/1434418cb968d053/1a3c957675242c7e?lnk=st&q=DBWIN_BUFFER&rnum=3#1a3c957675242c7e > > And I have been able to translate most things into python, but I have > been unable to get it to work. I use the pywin extensions to call > CreateEvent and create the required events. But when I wait on the > event using the WaitOnSingleEvent call, it hangs indefinitely.
Well, unhelpfully, I can't get it to work, either! I used the code below, so you might compare with yours to see if we're doing the same thing, but I can't see any obvious problems. This page which you may have seen: http://www.unixwiz.net/techtips/outputdebugstring.html is useful, but the security problem they identify with the mutex doesn't seem to apply when I'm a local admin and my two processes are run on my desktop. I did have a dig inside the mmapmodule.c code (for the second time in a month!) and a few differences do emerge from the posted code: - The python code uses a NULL security attribute, which should mean: full access to everyone. - The python code assumes an access of write means: create the file mapping for PAGE_READWRITE and map it for WRITE, while the posted code maps for READ only. Neither of these seems terribly significant, but who knows? The problem of course is that the OutputDebugString function is designed to fail silently, so you've no idea which part of your debugger is causing it to fail -- or something else altogether. I've scanned (very quickly) the MS groups on Google and I can't see anything helpful. Hopefully someone else on this or on the win32 list has more experience & expertise than I do here. (Which wouldn't be hard!) TJG <code> import sys import mmap import win32security import win32event def main (args): sd = win32security.SECURITY_DESCRIPTOR () dacl = win32security.ACL () sd.SetSecurityDescriptorDacl (1, dacl, 0) sa = win32security.SECURITY_ATTRIBUTES () sa.SECURITY_DESCRIPTOR = sd buffer_ready = win32event.CreateEvent (sa, 0, 0, "DBWIN_BUFFER_READY") data_ready = win32event.CreateEvent (sa, 0, 0, "DBWIN_DATA_READY") buffer = mmap.mmap (0, 4096, "DBWIN_BUFFER", mmap.ACCESS_READ) win32event.SetEvent (buffer_ready) while win32event.WaitForSingleObject (data_ready, 1000) == win32event.WAIT_TIMEOUT: pass if __name__ == '__main__': main (sys.argv[1:]) </code> -- http://mail.python.org/mailman/listinfo/python-list
