对于 Windows，您可以使用以下代码枚举所有相机和分辨率：
\n\n#include <dshow.h>\n#include <locale>\n#include <vector>\nusing namespace std;\n\n#define BLUE 0x0001\n#define GREEN 0x0002\n#define RED 0x0004\n#define GRAY 0x0007\n\nstatic void setcolor(unsigned int color) \n{\n HANDLE hCon = GetStdHandle(STD_OUTPUT_HANDLE); \n SetConsoleTextAttribute(hCon,color|FOREGROUND_INTENSITY);\n}\n\nvoid _FreeMediaType(AM_MEDIA_TYPE& mt)\n{\n if (mt.cbFormat != 0)\n {\n CoTaskMemFree((PVOID)mt.pbFormat);\n mt.cbFormat = 0;\n mt.pbFormat = NULL;\n }\n if (mt.pUnk != NULL)\n {\n // pUnk should not be used.\n mt.pUnk->Release();\n mt.pUnk = NULL;\n }\n}\n\n\nHRESULT CamCaps(IBaseFilter *pBaseFilter)\n{\n HRESULT hr = 0;\n vector<IPin*> pins;\n IEnumPins *EnumPins;\n pBaseFilter->EnumPins(&EnumPins);\n pins.clear();\n for(;;)\n {\n IPin *pin;\n hr=EnumPins->Next(1,&pin,NULL);\n if(hr!=S_OK){break;}\n pins.push_back(pin);\n pin->Release();\n } \n EnumPins->Release();\n\n printf("Device pins number: %d\\n",pins.size());\n\n PIN_INFO pInfo; \n for(int i=0;i<pins.size();i++)\n {\n pins[i]->QueryPinInfo(&pInfo);\n\n setcolor(RED);\n\n if(pInfo.dir==0)\n {\n wprintf(L"Pin name: %s (\xd0\x92\xd0\xb2\xd0\xbe\xd0\xb4)\\n",pInfo.achName);\n }\n\n if(pInfo.dir==1)\n {\n wprintf(L"Pin name: %s (\xd0\x92\xd1\x8b\xd1\x85\xd0\xbe\xd0\xb4)\\n",pInfo.achName);\n }\n\n IEnumMediaTypes *emt=NULL;\n pins[i]->EnumMediaTypes(&emt);\n\n AM_MEDIA_TYPE *pmt;\n\n vector<SIZE> modes;\n setcolor(GRAY);\n wprintf(L"Avialable resolutions.\\n",pInfo.achName);\n for(;;)\n { \n hr=emt->Next(1,&pmt,NULL);\n if(hr!=S_OK){break;}\n\n if ( (pmt->formattype == FORMAT_VideoInfo) &&\n //(pmt->subtype == MEDIASUBTYPE_RGB24) &&\n (pmt->cbFormat >= sizeof(VIDEOINFOHEADER)) &&\n (pmt->pbFormat != NULL) )\n {\n VIDEOINFOHEADER *pVIH = (VIDEOINFOHEADER*)pmt->pbFormat;\n SIZE s;\n // Get frame size\n s.cy=pVIH->bmiHeader.biHeight;\n s.cx=pVIH->bmiHeader.biWidth;\n // \xd0\x91\xd0\xb8\xd1\x82\xd1\x80\xd0\xb5\xd0\xb9\xd1\x82\n unsigned int bitrate=pVIH->dwBitRate;\n modes.push_back(s);\n // Bits per pixel\n unsigned int bitcount=pVIH->bmiHeader.biBitCount;\n REFERENCE_TIME t=pVIH->AvgTimePerFrame; // blocks (100ns) per frame\n int FPS=floor(10000000.0/static_cast<double>(t));\n printf("Size: x=%d\\ty=%d\\tFPS: %d\\t bitrate: %ld\\tbit/pixel:%ld\\n",s.cx,s.cy,FPS,bitrate,bitcount);\n }\n _FreeMediaType(*pmt);\n }\n //----------------------------------------------------\n // \n // \n // \n //----------------------------------------------------\n modes.clear();\n emt->Release();\n }\n\n pins.clear();\n\n return S_OK;\n}\n\n/*\n* Do something with the filter. In this sample we just test the pan/tilt properties.\n*/\nvoid process_filter(IBaseFilter *pBaseFilter)\n{\n CamCaps(pBaseFilter);\n}\n\n\n/*\n* Enumerate all video devices\n*\n* See also:\n*\n* Using the System Device Enumerator:\n* http://msdn2.microsoft.com/en-us/library/ms787871.aspx\n*/\nint enum_devices()\n{\n HRESULT hr;\n setcolor(GRAY);\n printf("Enumeraring videoinput devices ...\\n");\n\n // Create the System Device Enumerator.\n ICreateDevEnum *pSysDevEnum = NULL;\n hr = CoCreateInstance(CLSID_SystemDeviceEnum, NULL, CLSCTX_INPROC_SERVER,\n IID_ICreateDevEnum, (void **)&pSysDevEnum);\n if(FAILED(hr))\n {\n fprintf(stderr, "Error. Can\'t create enumerator.\\n");\n return hr;\n }\n\n // Obtain a class enumerator for the video input device category.\n IEnumMoniker *pEnumCat = NULL;\n hr = pSysDevEnum->CreateClassEnumerator(CLSID_VideoInputDeviceCategory, &pEnumCat, 0);\n\n if(hr == S_OK) \n {\n // Enumerate the monikers.\n IMoniker *pMoniker = NULL;\n ULONG cFetched;\n while(pEnumCat->Next(1, &pMoniker, &cFetched) == S_OK)\n {\n IPropertyBag *pPropBag;\n hr = pMoniker->BindToStorage(0, 0, IID_IPropertyBag, \n (void **)&pPropBag);\n if(SUCCEEDED(hr))\n {\n // To retrieve the filter\'s friendly name, do the following:\n VARIANT varName;\n VariantInit(&varName);\n hr = pPropBag->Read(L"FriendlyName", &varName, 0);\n if (SUCCEEDED(hr))\n {\n // Display the name in your UI somehow.\n setcolor(GREEN);\n wprintf(L"------------------> %s <------------------\\n", varName.bstrVal);\n }\n VariantClear(&varName);\n\n // To create an instance of the filter, do the following:\n IBaseFilter *pFilter;\n hr = pMoniker->BindToObject(NULL, NULL, IID_IBaseFilter,\n (void**)&pFilter);\n\n process_filter(pFilter);\n\n //Remember to release pFilter later.\n pPropBag->Release();\n }\n pMoniker->Release();\n }\n pEnumCat->Release();\n }\n pSysDevEnum->Release();\n\n return 0;\n}\n\n\nint wmain(int argc, wchar_t* argv[])\n{\n setlocale(LC_ALL, "Russian");\n int result;\n\n CoInitializeEx(NULL, COINIT_APARTMENTTHREADED);\n\n result = enum_devices();\n\n CoUninitialize();\n getchar();\n return result;\n}\n