所以我们有一个简单的C win32控制台应用程序.我们想要的只是打印可用的网络摄像机和其他视频捕获设备列表.我们想尽可能多地使用
windows apis – 毕竟没有外部库 – 我们想要的就是打印一个列表 – 不要飞到月球上!)如何做到这一点?
我自己的研究:
我发现这个official msdn sample但是我仍然没有得到如何将设备列表输出到屏幕=((对不起 – 我是C的新手)
……还有一些研究……
在一篇关于主题的最简单的ms样本中找到了这个
HRESULT OnInitDialog(HWND hwnd,ChooseDeviceParam *pParam) { HRESULT hr = S_OK; HWND hList = GetDlgItem(hwnd,IDC_DEVICE_LIST); // Display a list of the devices. for (DWORD i = 0; i < pParam->count; i++) { WCHAR *szFriendlyName = NULL; hr = pParam->ppDevices[i]->GetAllocatedString( MF_DEVSOURCE_ATTRIBUTE_FRIENDLY_NAME,&szFriendlyName,NULL ); if (Failed(hr)) { break; } int index = ListBox_AddString(hList,szFriendlyName); ListBox_SetItemData(hList,index,i); CoTaskMemFree(szFriendlyName); }
看起来它应该做的工作,但我不知道如何将其包含在简单的命令行应用程序中,以便输出数据…
也来自这个系列:
> How to get a list of video capture devices on linux?和special details on getting cameras NAMES正确,经过测试的答案
> How to get a list of video capture devices on Mac OS?正确,尚未通过我的答案测试
> How to get a list of video capture devices on windows?正确,经过测试的答案
> How to get a list video capture devices NAMES using Qt (crossplatform)?
从显示的示例中,将以下代码复制到dev.c.然后打开包含所有SDK变量集的命令行.在命令行链接到ole32.lib和oleaut32.lib.然后它会显示所有设备.
原文链接:https://www.f2er.com/windows/364753.htmlcl dev.c ole32.lib oleaut32.lib
dev.exe将在命令行中列出该列表.
#include <windows.h> #include <dshow.h> #pragma comment(lib,"strmiids") HRESULT EnumerateDevices(REFGUID category,IEnumMoniker **ppEnum) { // Create the System Device Enumerator. ICreateDevEnum *pDevEnum; HRESULT hr = CoCreateInstance(CLSID_SystemDeviceEnum,NULL,CLSCTX_INPROC_SERVER,IID_PPV_ARGS(&pDevEnum)); if (SUCCEEDED(hr)) { // Create an enumerator for the category. hr = pDevEnum->CreateClassEnumerator(category,ppEnum,0); if (hr == S_FALSE) { hr = VFW_E_NOT_FOUND; // The category is empty. Treat as an error. } pDevEnum->Release(); } return hr; } void DisplayDeviceInformation(IEnumMoniker *pEnum) { IMoniker *pMoniker = NULL; while (pEnum->Next(1,&pMoniker,NULL) == S_OK) { IPropertyBag *pPropBag; HRESULT hr = pMoniker->BindToStorage(0,IID_PPV_ARGS(&pPropBag)); if (Failed(hr)) { pMoniker->Release(); continue; } VARIANT var; VariantInit(&var); // Get description or friendly name. hr = pPropBag->Read(L"Description",&var,0); if (Failed(hr)) { hr = pPropBag->Read(L"FriendlyName",0); } if (SUCCEEDED(hr)) { printf("%S\n",var.bstrVal); VariantClear(&var); } hr = pPropBag->Write(L"FriendlyName",&var); // WaveInID applies only to audio capture devices. hr = pPropBag->Read(L"WaveInID",0); if (SUCCEEDED(hr)) { printf("WaveIn ID: %d\n",var.lVal); VariantClear(&var); } hr = pPropBag->Read(L"DevicePath",0); if (SUCCEEDED(hr)) { // The device path is not intended for display. printf("Device path: %S\n",var.bstrVal); VariantClear(&var); } pPropBag->Release(); pMoniker->Release(); } } void main() { HRESULT hr = CoInitializeEx(NULL,COINIT_MULTITHREADED); if (SUCCEEDED(hr)) { IEnumMoniker *pEnum; hr = EnumerateDevices(CLSID_VideoInputDeviceCategory,&pEnum); if (SUCCEEDED(hr)) { DisplayDeviceInformation(pEnum); pEnum->Release(); } hr = EnumerateDevices(CLSID_AudioInputDeviceCategory,&pEnum); if (SUCCEEDED(hr)) { DisplayDeviceInformation(pEnum); pEnum->Release(); } CoUninitialize(); } }