Re: [python-win32] win32com calling C++ COM interface

[Mark Hammond]

Your code is explicitly creating a buffer object, which the win32com framework translates as "array of bytes".  Try just passing a list (or tuple) of integers instead of the buffer.

 

Mark

-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]On Behalf Of Shad Muegge
Sent: Thursday, 20 October 2005 6:23 AM
To: python-win32@python.org
Subject: [python-win32] win32com calling C++ COM interface

Hi,

 

I've just started looking at Python.  I am trying to resolve an issue a user is having trying to access the COM interface in our application from Python.

 

C++ code:

 

STDMETHODIMP       

CMyClass::Read(
  const int   x,    

  VARIANT  *indexlist,          // IN:  "safe" array of  4-byte integers
  VARIANT  *results)

 

 

Python code:

 

    def read(self, x, addr):
        try:
            addr = buffer(array.array('L', addr))
            data = "" addr)
...

 

x.read(0, 0x12345678)

 

The variant that shows up on the C++ code is a safearray of 1-byte integers with 4 elements: 12, 34, 56, 78.

 

The API treats them each as individual "addresses"...

 

Here's the COM definition from the .py file.

 

 def Read(self, x=defaultNamedNotOptArg, indexlist=defaultNamedNotOptArg, results=pythoncom.Missing):
  """method Read"""
  return self._ApplyTypes_(2, 1, (24, 0), ((3, 1), (16396, 1), (16396, 2)), 'Read', None,x
   , indexlist, results)
 

Thanks,

Shad

 

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