visual-studio 如何获取 Windows 上的视频捕获设备（网络摄像头）列表？(C++)
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原文地址: http://stackoverflow.com/questions/4286223/
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How to get a list of video capture devices (web cameras) on windows? (C++)
提问by Rella
So we have a simple C++ win32 console app. All we want is to print list of web cameras and other video capture devices that are avaliable. We want to use windows apis as much as possible - no external libs - after all - all we want is to print out a a list - not to fly onto the moon!) How to do such thing?
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的列表。我们想尽可能多地使用windows apis - 没有外部libs - 毕竟 - 我们想要的只是打印出aa list - 不要飞上月球！）如何做这样的事情？
My own reserch: I found this official msdn samplebut I still do not get how to output device list onto screen=( (sorry - I am new to C++)
我自己的研究：我找到了这个官方的 msdn 示例，但我仍然不知道如何将设备列表输出到屏幕=（（抱歉 - 我是 C++ 新手）
... some more reserch...
......更多的研究......
In one of simpliest ms samples on topic found this
在有关主题的最简单的 ms 示例之一中发现了这一点
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);
}
looks like it should do the job but I do not get how to include this into simple command line app so to output data...
看起来它应该可以完成这项工作，但我不知道如何将它包含到简单的命令行应用程序中以输出数据...
also from this series:
也来自这个系列：
- How to get a list of video capture devices on linux?and special details on getting cameras NAMESwith correct, tested answers
- How to get a list of video capture devices on Mac OS?with correct, not yet tested by my answers
- How to get a list of video capture devices on windows?with correct, tested answers
- How to get a list video capture devices NAMES using Qt (crossplatform)?
- 如何在 linux 上获取视频捕获设备列表？以及有关使用正确、经过测试的答案获取摄像机名称的特殊详细信息
- 如何获取 Mac OS 上的视频捕获设备列表？正确的，尚未通过我的答案测试
- 如何获取 Windows 上的视频捕获设备列表？有正确的、经过测试的答案
- 如何使用 Qt（跨平台）获取列表视频捕获设备名称？
回答by Naveen
From the examples shown, copy the following code into dev.c. Then open the command line with all the SDK variables set. At the command line link to ole32.lib and oleaut32.lib. It will then show you all the devices.
从显示的示例中，将以下代码复制到 dev.c。然后打开设置了所有 SDK 变量的命令行。在命令行链接到 ole32.lib 和 oleaut32.lib。然后它将向您显示所有设备。
cl dev.c ole32.lib oleaut32.lib
cl dev.c ole32.lib oleaut32.lib
dev.exe will give out the list on the command line.
dev.exe 将在命令行上给出列表。
#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, 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", &var, 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", &var, 0);
if (SUCCEEDED(hr))
{
printf("WaveIn ID: %d\n", var.lVal);
VariantClear(&var);
}
hr = pPropBag->Read(L"DevicePath", &var, 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();
}
}
回答by Jerry Coffin
This being Microsoft, what could reasonably have been somewhere around 10 lines of code will, thanks to the wonders of COM, end up as a couple hundred linesor so.
这就是微软，由于 COM 的奇迹，本可以合理地大约在 10 行左右的代码最终会变成几百行左右。
回答by Martin Beckett
How to let user select a video recording device (web-cam) with OpenCV?
如何让用户使用 OpenCV 选择视频录制设备（网络摄像头）？
the answer isnt opencv specific
答案不是特定于 opencv 的
