winsdk-10

In Python I'm trying to call the Windows API EnumRunning method of the IRunningObjectTable interface that I get from the GetRunningObjectTable function using the comtypes and ctypes modules (I want to avoid using other non-standard modules such as pythoncom).

I mainly retrieved and modified the code from the pages moniker.py and persist.py and the objbase.h header file in C:\Program Files\Windows Kits\10\Include\10.0.17763.0\um.

When I try to call the EnumRunning method a ValueError exception is raised:

Procedure probably called with not enough arguments (4 bytes missing)

The exception's message comes from the file _ctypes.pyd since it does change if I modify it in the file but I can't read the compiled Python code contained in it to try to understand why it's being raised.

The documentation of the ValueError exception is:

Raised when an operation or function receives an argument that has the right type but an inappropriate value, and the situation is not described by a more precise exception such as IndexError.

So the issue might be the value of the IRunningObjectTable interface that I get from the GetRunningObjectTable function. Though the function does return the HRESULT S_OK value so I'm not sure.

I have searched for the message of the exception but the information I got was about the calling convention and that some argument was missing which I have checked and does not seem to be the case.

If I try calling it with another argument I get the TypeError exception:

this function takes 1 argument (2 given)

There's only one argument so the order is correct and trying to use cdll or oledll instead of windll didn't worked either.

Here's the code: