Adding an "Interface" from IDL / tlb files to an existing win32COM-Object

[VolkerS]

Hallo,
I need helping adding an existing Interface to an object I dispatched from a COM-server via win32com in Python.

The Code for this in VisualBasic looks like that:

Private Obj_1 As Obj1_LIB.Impl_1
Private mHelper As Object
Private m_applJob As Object
Private m_applModul As interface_Module //interface_Module is described in an IDL/TLB-File
Private cont As Boolean
Private c_applJob As New ApplicationJob.Job
 
 Set m_Obj_1 = CreateObject("Obj1_LIB.Impl_1")
m_Obj_1.Init
 
 Set mHelper = CreateObject("ModulHelper.Helper")
Set m_applJob = CreateObject("ApplicationJob.Job")
    Set m_applModul = m_applJob
 
    m_applModul.method1_from_appl_module
    m_applModul.method2_from_appl_module

These methods (method1/_from_appl_module) are part of the interface loaded from interface_module and not part of the m_applJob-Object. Nevertheless, m_applModul now also supports all methods from the m_applJob-Object.

So how can I do this in Python?
I tried this, which didn't work:

import win32com.client
Obj_1 = win32com.client.Dispatch("Obj1_LIB.Impl_1")
Obj_1.Init()
 
ModulHelp = win32com.client.Dispatch("ModulHelper.Helper")
applJob = win32com.client.Dispatch("ApplicationJob.Job")
 
applJob._oleobj_.QueryInterface("{7DE9DB29-1794-4C3B-95EA-E1324B15BBE6}")  ##using the uuid of the interface described in the IDL
 

This says "interface not supported"

I'd appreciate your help in this!

[bartonc]

Hallo,
I need helping adding an existing Interface to an object I dispatched from a COM-server via win32com in Python.

The Code for this in VisualBasic looks like that:

Private Obj_1 As Obj1_LIB.Impl_1
Private mHelper As Object
Private m_applJob As Object
Private m_applModul As interface_Module //interface_Module is described in an IDL/TLB-File
Private cont As Boolean
Private c_applJob As New ApplicationJob.Job
 
 Set m_Obj_1 = CreateObject("Obj1_LIB.Impl_1")
m_Obj_1.Init
 
 Set mHelper = CreateObject("ModulHelper.Helper")
Set m_applJob = CreateObject("ApplicationJob.Job")
    Set m_applModul = m_applJob
 
    m_applModul.method1_from_appl_module
    m_applModul.method2_from_appl_module

These methods (method1/_from_appl_module) are part of the interface loaded from interface_module and not part of the m_applJob-Object. Nevertheless, m_applModul now also supports all methods from the m_applJob-Object.

So how can I do this in Python?
I tried this, which didn't work:

import win32com.client
Obj_1 = win32com.client.Dispatch("Obj1_LIB.Impl_1")
Obj_1.Init()
 
ModulHelp = win32com.client.Dispatch("ModulHelper.Helper")
applJob = win32com.client.Dispatch("ApplicationJob.Job")
 
applJob._oleobj_.QueryInterface("{7DE9DB29-1794-4C3B-95EA-E1324B15BBE6}")  ##using the uuid of the interface described in the IDL
 

This says "interface not supported"

I'd appreciate your help in this!

It would help if you paste the whole error message. Sometimes, even if a pythoneer dosn't know a particular package, they can deduce what's wrong from the error message. Thanks.

[VolkerS]

The error message I get is:

Traceback (most recent call last):
File "C:\PROGRA~1\python\lib\site-packages\Pythonwin\pywin\framework\scriptutils.py" , line 310, in RunScript
exec codeObject in __main__.__dict__
File "M:\Diagnose\Projekt EE61\ApplJob4test.py", line 655, in ?
m_applJob=applJob._oleobj_.QueryInterface("{7DE9DB 29-1794-4C3B-95EA-E1324B15BBE6}")
com_error: (-2147467262, 'Schnittstelle nicht unterst\xfctzt', None, None)

in fact it also happens (sometimes, without changing the code) that I get this message:

Traceback (most recent call last):
File "C:\PROGRA~1\python\lib\site-packages\Pythonwin\pywin\framework\scriptutils.py" , line 310, in RunScript
exec codeObject in __main__.__dict__
File "M:\Diagnose\Projekt EE61\ApplJob4test.py", line 655, in ?
m_applJob=applJob._oleobj_.QueryInterface("{7DE9DB 29-1794-4C3B-95EA-E1324B15BBE6}")
TypeError: There is no interface object registered that supports this IID