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.
cl 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();
}
}