[pywin32-bugs] [ pywin32-Bugs-733540 ] Calling com server w/VB "Call" changes 1st param's value

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Bugs item #733540, was opened at 2003-05-06 14:57
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Category: com
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Ryan Groe (ryangroe)
Assigned to: Nobody/Anonymous (nobody)
Summary: Calling com server w/VB "Call" changes 1st param's value

Initial Comment:
python version: 2.2.2
win32all version: 152
platform: win2k server with WSH 5.6

description:
I have a pythoncom server (using DynamicPolicy) with a 
function that takes a single parameter.  Calling that 
function from VB/VBScript using "Call" (ignoring the 
return value) causes the passed parameter to be set to 
the return value of that function.  If I assign the return 
value to a VB variable the parameter's value doesn't 
change:

'Python COM server
class Object:
  def _dynamic_(self, name, lcid, wFlags, args):
    return getattr( self, string.lower(name) )(*args)
  def func1(self, S1):
    pass

'Called From VBScript
Call obj.func1(param) 'Bad, param gets set to Null
rval = obj.func1(param) 'OK, param retains its value

I'm at a loss as to why this is.  The only difference I can 
see at the policy level is wFlags, with one style it's 3 
(DISPATCH_METHOD | DISPATCH_PROPERTYGET) 
and the other it's 1 (DISPATCH_METHOD)

Attached is a zip containing a pythoncom server, a 
VBScript test file and a batch (cmd) file to run the test.  
Please let me know if I've done something incorrectly.


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