return null without setting an error

[Starxyz]

hello~
I got this error when i use window 7 x64 , but everything is OK in win10.
How can I fix it?

[Barmaley13]

That needs to be fixed in C but you can wrap your code into
try - except guards for now in Python like so

try:
    device_list = device.getDeviceList()
except:
    pass

[alex-ong]

I managed to get a fix:

static PyObject *
getDeviceList(PyObject *self, PyObject *args)
{
	PyObject* pyList = NULL; 
	
	HRESULT hr = CoInitializeEx(NULL, COINIT_MULTITHREADED);
	
	//backup; run it without multithreading.
	if (!SUCCEEDED(hr))
	{				
		hr = CoInitializeEx(NULL, COINIT_APARTMENTTHREADED | COINIT_DISABLE_OLE1DDE);
	}
	
	if (SUCCEEDED(hr))
	{
		IEnumMoniker *pEnum;

		hr = EnumerateDevices(CLSID_VideoInputDeviceCategory, &pEnum);
		if (SUCCEEDED(hr))
		{
			pyList = DisplayDeviceInformation(pEnum);
			pEnum->Release();
		}
		CoUninitialize();
	} else {
		PyErr_SetString(PyExc_TypeError, "Could not call CoInitializeEx");		
	}

    return pyList;
}

[Avasam]

Related, possibly duplicate: #5

[suhren]

In case anyone stumbles onto this, I am still getting this error in windows-capture-device-list==1.1.0 on Windows 11.

[emoto-yasushi]

I am using Windows 11. Just a few code changes and this error appears. I don't know what the cause is.

In my environment, the following code gives me an error.

from distutils.dir_util import copy_tree

import device
device_list = device.getDeviceList()
print(device_list)

The following code does not produce an error.

import device
device_list = device.getDeviceList()
print(device_list)

However, it seems that not only "distutils.dir_util" is affected, but also other libraries.