A working example of DirectShow Listing Video Input Devices

dshow_list_audio_device.cpp

#include <stdio.h>
#include <dshow.h>
#pragma comment(lib, "strmiids")
int _tmain(int argc, _TCHAR* argv[])
{
	ICreateDevEnum *pSysDevEnum = NULL;
	HRESULT hr = CoInitialize(NULL);
	hr = CoCreateInstance(CLSID_SystemDeviceEnum,NULL, CLSCTX_INPROC_SERVER,
		IID_ICreateDevEnum, (void **)&pSysDevEnum);
	if(FAILED(hr)){
		wprintf(L"failed to init CoCreateInstance\n");
		//getchar();
		return hr;

	}
	IEnumMoniker * pEnumCat = NULL;
	//Obtain a class enumerator for the video input category.
	hr = pSysDevEnum->CreateClassEnumerator(CLSID_VideoInputDeviceCategory,
		&pEnumCat, 0);
	if( hr == S_OK){
		//Enumerate the moniker
		IMoniker *pMoniker = NULL;
		ULONG cFetched;
		while(pEnumCat->Next(1,&pMoniker,&cFetched) == S_OK){
			IPropertyBag *pPropBag;
			hr = pMoniker->BindToStorage(0,0, IID_IPropertyBag,
				(void**)&pPropBag);
			if(SUCCEEDED(hr))
			{
				//Retrieve the filter`s friendly name.
				VARIANT varName,varDesc,varPath;
				VariantInit(&varName);
				VariantInit(&varDesc);
				VariantInit(&varPath);
				hr = pPropBag->Read(L"FriendlyName", &varName, 0);
				
				if(SUCCEEDED(hr)){
					wprintf(L"the dev name is:\t%s\n",
						varName.bstrVal);
				}
				hr = pPropBag->Read(L"Description", &varDesc, 0);
				if(SUCCEEDED(hr)){
					wprintf(L"the dev desc is:\t%s\n",
						varDesc.bstrVal);
				}
				hr = pPropBag->Read(L"DevicePath", &varPath, 0);
				if(SUCCEEDED(hr)){
					wprintf(L"the dev path is:\t%s\n",
						varPath.bstrVal);
				}
				VariantClear(&varName);
				VariantClear(&varDesc);
				VariantClear(&varPath);
			}
			pPropBag->Release();
		}
		pEnumCat->Release();
	}
	pSysDevEnum->Release();
	return 0;
}