opencv获取多个摄像头名字和编号

因为项目需要，利用opencv读取多个摄像头，但没法确定摄像头的编号。查看opencv的源码，摄像头的id主要利用了listDevices这个函数，自己把这个函数单独提取出来，根据vector<>中的排序，得到摄像机id。

int listDevices(vector<string>& list){

	//COM Library Intialization
	//comInit();

	//if (!silent)printf("nVIDEOINPUT SPY MODE!nn");


	ICreateDevEnum *pDevEnum = NULL;
	IEnumMoniker *pEnum = NULL;
	int deviceCounter = 0;
	CoInitialize(NULL);
	HRESULT hr = CoCreateInstance(CLSID_SystemDeviceEnum, NULL,
		CLSCTX_INPROC_SERVER, IID_ICreateDevEnum,
		reinterpret_cast<void**>(&pDevEnum));


	if (SUCCEEDED(hr))
	{
		// Create an enumerator for the video capture category.
		hr = pDevEnum->CreateClassEnumerator(
			CLSID_VideoInputDeviceCategory,
			&pEnum, 0);

		if (hr == S_OK){

			//if (!silent)printf("SETUP: Looking For Capture Devicesn");
			IMoniker *pMoniker = NULL;

			while (pEnum->Next(1, &pMoniker, NULL) == S_OK){

				IPropertyBag *pPropBag;
				hr = pMoniker->BindToStorage(0, 0, IID_IPropertyBag,
					(void**)(&pPropBag));

				if (FAILED(hr)){
					pMoniker->Release();
					continue;  // Skip this one, maybe the next one will work.
				}


				// Find the description or friendly name.
				VARIANT varName;
				VariantInit(&varName);
				hr = pPropBag->Read(L"Description", &varName, 0);

				if (FAILED(hr)) hr = pPropBag->Read(L"FriendlyName", &varName, 0);

				if (SUCCEEDED(hr)){

					hr = pPropBag->Read(L"FriendlyName", &varName, 0);

					int count = 0;
					char tmp[255] = {0};
					//int maxLen = sizeof(deviceNames[0]) / sizeof(deviceNames[0][0]) - 2;
					while (varName.bstrVal[count] != 0x00 && count < 255) {
						tmp[count] = (char)varName.bstrVal[count];
						count++;
					}
					list.push_back(tmp);
					//deviceNames[deviceCounter][count] = 0;

					//if (!silent)printf("SETUP: %i) %s n", deviceCounter, deviceNames[deviceCounter]);
				}

				pPropBag->Release();
				pPropBag = NULL;

				pMoniker->Release();
				pMoniker = NULL;

				deviceCounter++;
			}

			pDevEnum->Release();
			pDevEnum = NULL;

			pEnum->Release();
			pEnum = NULL;
		}

		//if (!silent)printf("SETUP: %i Device(s) foundnn", deviceCounter);
	}

	//comUnInit();

	return deviceCounter;
}

结果如下：

根据这个编号，就可以比较灵活的选择摄像机了。方法比较笨，勉强可用。

测试源码

最后

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