Python Wrapper for C# Com Object

B

bg_ie

Hi,

I wish to write a Python wrapper for my C# COM object but am unsure
where to start. I have a dll and a tlb file, and I can use this object
in C via the following code -

// ConsolApp.cpp : Defines the entry point for the console application.
//
#include "stdafx.h"
#include "windows.h"
#include "stdio.h"
#import "C:\Documents and Settings\X\Mina dokument\Visual Studio
2005\Projects\X_COMObject\X_COMObject\bin\Debug\X_COMObject.tlb"
using namespace X_COMObject;

int _tmain(int argc, _TCHAR* argv[])
{
CoInitialize(NULL);

X_COMObject::XCOM_InterfacePtr p(__uuidof(X_COMObject::XCOM_Class));
XCOM_Interface *X_com_ptr ;
X_com_ptr = p ;
X_com_ptr->SetID(10);
int x = X_com_ptr->GetID();
printf("%d",x);
getchar();

return 0;
}

Can anyone offer me some tips as to how to do this in Python?

Thanks very much for your help,

Barry.
 
B

bg_ie

(e-mail address removed) skrev:
Hi,

I wish to write a Python wrapper for my C# COM object but am unsure
where to start. I have a dll and a tlb file, and I can use this object
in C via the following code -

// ConsolApp.cpp : Defines the entry point for the console application.
//
#include "stdafx.h"
#include "windows.h"
#include "stdio.h"
#import "C:\Documents and Settings\X\Mina dokument\Visual Studio
2005\Projects\X_COMObject\X_COMObject\bin\Debug\X_COMObject.tlb"
using namespace X_COMObject;

int _tmain(int argc, _TCHAR* argv[])
{
CoInitialize(NULL);

X_COMObject::XCOM_InterfacePtr p(__uuidof(X_COMObject::XCOM_Class));
XCOM_Interface *X_com_ptr ;
X_com_ptr = p ;
X_com_ptr->SetID(10);
int x = X_com_ptr->GetID();
printf("%d",x);
getchar();

return 0;
}

Can anyone offer me some tips as to how to do this in Python?

Thanks very much for your help,

Barry.
Click to expand...

This is what I've done so far, but I know I'm not doing this correctly.
Can anyone help me out?

#import pythoncom
#pythoncom.CoInitialize()

from comtypes.client import GetModule, CreateObject

module = GetModule("C:\\Documents and Settings\\X\\Mina
dokument\\Visual Studio
2005\\Projects\\X_COMObject\\X_COMObject\\bin\\Debug\\X_COMObject.tlb")

dir(module)

interface = module.XCOM_Interface()

dir(interface)

interface.SetID()

#pythoncom.CoUnitialize()


Traceback (most recent call last):
File "C:/Python25/test.py", line 14, in <module>
interface.SetID()
TypeError: Expected a COM this pointer as first argument
 
B

bg_ie

(e-mail address removed) skrev:
(e-mail address removed) skrev:
Hi,

I wish to write a Python wrapper for my C# COM object but am unsure
where to start. I have a dll and a tlb file, and I can use this object
in C via the following code -

// ConsolApp.cpp : Defines the entry point for the console application.
//
#include "stdafx.h"
#include "windows.h"
#include "stdio.h"
#import "C:\Documents and Settings\X\Mina dokument\Visual Studio
2005\Projects\X_COMObject\X_COMObject\bin\Debug\X_COMObject.tlb"
using namespace X_COMObject;

int _tmain(int argc, _TCHAR* argv[])
{
CoInitialize(NULL);

X_COMObject::XCOM_InterfacePtr p(__uuidof(X_COMObject::XCOM_Class));
XCOM_Interface *X_com_ptr ;
X_com_ptr = p ;
X_com_ptr->SetID(10);
int x = X_com_ptr->GetID();
printf("%d",x);
getchar();

return 0;
}

Can anyone offer me some tips as to how to do this in Python?

Thanks very much for your help,

Barry.
Click to expand...

This is what I've done so far, but I know I'm not doing this correctly.
Can anyone help me out?

#import pythoncom
#pythoncom.CoInitialize()

from comtypes.client import GetModule, CreateObject

module = GetModule("C:\\Documents and Settings\\X\\Mina
dokument\\Visual Studio
2005\\Projects\\X_COMObject\\X_COMObject\\bin\\Debug\\X_COMObject.tlb")

dir(module)

interface = module.XCOM_Interface()

dir(interface)

interface.SetID()

#pythoncom.CoUnitialize()


Traceback (most recent call last):
File "C:/Python25/test.py", line 14, in <module>
interface.SetID()
TypeError: Expected a COM this pointer as first argument
Click to expand...

Can anyone help me with this?

Thanks,

Barry.
 
T

TheSeeker

Hi,

A question. Why in your C-version are your doing:

X_com_ptr->SetID(10);

and in the Python version:

interface.SetID() ?

I don't know anything of your COM object, but does SetID require a
parameter?

Duane


(e-mail address removed) skrev:
(e-mail address removed) skrev:
Hi,

I wish to write a Python wrapper for my C# COM object but am unsure
where to start. I have a dll and a tlb file, and I can use this object
in C via the following code -

// ConsolApp.cpp : Defines the entry point for the console application.
//
#include "stdafx.h"
#include "windows.h"
#include "stdio.h"
#import "C:\Documents and Settings\X\Mina dokument\Visual Studio
2005\Projects\X_COMObject\X_COMObject\bin\Debug\X_COMObject.tlb"
using namespace X_COMObject;

int _tmain(int argc, _TCHAR* argv[])
{
CoInitialize(NULL);

X_COMObject::XCOM_InterfacePtr p(__uuidof(X_COMObject::XCOM_Class));
XCOM_Interface *X_com_ptr ;
X_com_ptr = p ;
X_com_ptr->SetID(10);
int x = X_com_ptr->GetID();
printf("%d",x);
getchar();

return 0;
}

Can anyone offer me some tips as to how to do this in Python?

Thanks very much for your help,

Barry.
Click to expand...

This is what I've done so far, but I know I'm not doing this correctly.
Can anyone help me out?

#import pythoncom
#pythoncom.CoInitialize()

from comtypes.client import GetModule, CreateObject

module = GetModule("C:\\Documents and Settings\\X\\Mina
dokument\\Visual Studio
2005\\Projects\\X_COMObject\\X_COMObject\\bin\\Debug\\X_COMObject.tlb")

dir(module)

interface = module.XCOM_Interface()

dir(interface)

interface.SetID()

#pythoncom.CoUnitialize()


Traceback (most recent call last):
File "C:/Python25/test.py", line 14, in <module>
interface.SetID()
TypeError: Expected a COM this pointer as first argument
Click to expand...

Can anyone help me with this?

Thanks,

Barry.
Click to expand...
 
T

Thomas Heller

(e-mail address removed) skrev:
Hi,

I wish to write a Python wrapper for my C# COM object but am unsure
where to start. I have a dll and a tlb file, and I can use this object
in C via the following code -

// ConsolApp.cpp : Defines the entry point for the console application.
//
#include "stdafx.h"
#include "windows.h"
#include "stdio.h"
#import "C:\Documents and Settings\X\Mina dokument\Visual Studio
2005\Projects\X_COMObject\X_COMObject\bin\Debug\X_COMObject.tlb"
using namespace X_COMObject;

int _tmain(int argc, _TCHAR* argv[])
{
CoInitialize(NULL);

X_COMObject::XCOM_InterfacePtr p(__uuidof(X_COMObject::XCOM_Class));
XCOM_Interface *X_com_ptr ;
X_com_ptr = p ;
X_com_ptr->SetID(10);
int x = X_com_ptr->GetID();
printf("%d",x);
getchar();

return 0;
}

Can anyone offer me some tips as to how to do this in Python?

Thanks very much for your help,

Barry.
Click to expand...

This is what I've done so far, but I know I'm not doing this correctly.
Can anyone help me out?

#import pythoncom
#pythoncom.CoInitialize()
Click to expand...

The above is unneeded if you use comtypes as below (and is unneeded
when using pythoncom, as well).
from comtypes.client import GetModule, CreateObject

module = GetModule("C:\\Documents and Settings\\X\\Mina
dokument\\Visual Studio
2005\\Projects\\X_COMObject\\X_COMObject\\bin\\Debug\\X_COMObject.tlb")
Click to expand...
You don't intantiate the interface, you have to instantiate the COM object.
Something like

CreateObject("XCOM_Class")

but of course you have to use the correct argument in the call - the progid
of the COM object.
Alternatively you can use the CoClass from the typelibrary, look into the
generated module in the comtypes\gen directory for a class derived from
comtypes.CoClass.

InternetExplorer, for example, can be started in these ways:

# using the progid:
ie = CreateObject("InternetExplorer.Application")

# using the clsid:
ie = CreateObject("{0002DF01-0000-0000-C000-000000000046}")


# using the coclass from the generated module:
mod = GetModule("shdocvw.dll")
ie = CreateObject(mod.InternetExplorer)

Thomas
 
B

bg_ie

Thomas Heller skrev:
(e-mail address removed) skrev:
Hi,

I wish to write a Python wrapper for my C# COM object but am unsure
where to start. I have a dll and a tlb file, and I can use this object
in C via the following code -

// ConsolApp.cpp : Defines the entry point for the console application.
//
#include "stdafx.h"
#include "windows.h"
#include "stdio.h"
#import "C:\Documents and Settings\X\Mina dokument\Visual Studio
2005\Projects\X_COMObject\X_COMObject\bin\Debug\X_COMObject.tlb"
using namespace X_COMObject;

int _tmain(int argc, _TCHAR* argv[])
{
CoInitialize(NULL);

X_COMObject::XCOM_InterfacePtr p(__uuidof(X_COMObject::XCOM_Class));
XCOM_Interface *X_com_ptr ;
X_com_ptr = p ;
X_com_ptr->SetID(10);
int x = X_com_ptr->GetID();
printf("%d",x);
getchar();

return 0;
}

Can anyone offer me some tips as to how to do this in Python?

Thanks very much for your help,

Barry.
Click to expand...

This is what I've done so far, but I know I'm not doing this correctly.
Can anyone help me out?

#import pythoncom
#pythoncom.CoInitialize()
Click to expand...

The above is unneeded if you use comtypes as below (and is unneeded
when using pythoncom, as well).
from comtypes.client import GetModule, CreateObject

module = GetModule("C:\\Documents and Settings\\X\\Mina
dokument\\Visual Studio
2005\\Projects\\X_COMObject\\X_COMObject\\bin\\Debug\\X_COMObject.tlb")
Click to expand...
You don't intantiate the interface, you have to instantiate the COM object.
Something like

CreateObject("XCOM_Class")

but of course you have to use the correct argument in the call - the progid
of the COM object.
Alternatively you can use the CoClass from the typelibrary, look into the
generated module in the comtypes\gen directory for a class derived from
comtypes.CoClass.

InternetExplorer, for example, can be started in these ways:

# using the progid:
ie = CreateObject("InternetExplorer.Application")

# using the clsid:
ie = CreateObject("{0002DF01-0000-0000-C000-000000000046}")


# using the coclass from the generated module:
mod = GetModule("shdocvw.dll")
ie = CreateObject(mod.InternetExplorer)

Thomas
Click to expand...

Thanks very much for your help.

I tried running the following code -

import win32com.client
scanObj = win32com.client.Dispatch("X_COMObject")

but im getting the following error -

Traceback (most recent call last):
File
"C:\Python22\Lib\site-packages\pythonwin\pywin\framework\scriptutils.py",
line 310, in RunScript
exec codeObject in __main__.__dict__
File "C:\Python25\test.py", line 20, in ?
scanObj = win32com.client.Dispatch("Scania_COMObject")
File "C:\Python22\Lib\site-packages\win32com\client\__init__.py",
line 95, in Dispatch
dispatch, userName =
dynamic._GetGoodDispatchAndUserName(dispatch,userName,clsctx)
File "C:\Python22\Lib\site-packages\win32com\client\dynamic.py", line
98, in _GetGoodDispatchAndUserName
return (_GetGoodDispatch(IDispatch, clsctx), userName)
File "C:\Python22\Lib\site-packages\win32com\client\dynamic.py", line
78, in _GetGoodDispatch
IDispatch = pythoncom.CoCreateInstance(IDispatch, None, clsctx,
pythoncom.IID_IDispatch)
com_error: (-2147221005, 'Invalid Class String', None, None)

I ran my C++ code again and it works fine. I also checked COM Browser
and my X_COMObject is present and I'm spelling it right.

Any ideas what the problem migth be?

Thanks again,

Barry.
 

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