Windows UVC IMoniker对象获取位置等属性的方法

（1）获取设备路径

IMoniker是DShow组件的一个接口，通过IMoniker的BindToStorage(0, 0, IID_IPropertyBag, (void **)&pBag)方法可以获取IPropertyBag对象，然后通过IPropertyBag对象的Read(L”DevicePath”, &varDevPath, NULL)方法获取设备路径。

void GetMonikerDeviceInfo(IMoniker *pM)
{
    HRESULT hr;
    IPropertyBag *pBag = 0;

    USES_CONVERSION;

    hr = pM->BindToStorage(0, 0, IID_IPropertyBag, (void **)&pBag);
    if(SUCCEEDED(hr))
    {
        VARIANT varDevPath;
        varDevPath.vt = VT_BSTR;
        hr = pBag->Read(L"DevicePath", &varDevPath, NULL);
        {
            if(SUCCEEDED(hr))
            {
                _tprintf(TEXT("DevicePath = %s\n"), W2T(varDevPath.bstrVal));
                GetDevPathInfo(W2T(varDevPath.bstrVal));
                SysFreeString(varDevPath.bstrVal); 
            }
        }

        SAFE_RELEASE(pBag);
    }
}

（2）通过设备路径获取设备属性

通过SetupDiOpenDeviceInterface函数打开设备路径，在通过SetupDiGetDeviceInterfaceDetail函数获取SP_DEVINFO_DATA结构的值，有了这个值就可以调用SetupDiGetDeviceRegistryProperty函数获取设备的一系列属性值了。

void GetDevPathInfo(LPCTSTR szIntfPath)
{
    HDEVINFO hDevInfo = SetupDiCreateDeviceInfoList(NULL, NULL);
    if (INVALID_HANDLE_VALUE == hDevInfo)
    {
        return;
    }


    BYTE Buf[1024] = {0};
    TCHAR szTemp[MAX_PATH] = {0};

    SP_DEVICE_INTERFACE_DATA spdid = {0};
    spdid.cbSize = sizeof(SP_DEVICE_INTERFACE_DATA);


    PSP_DEVICE_INTERFACE_DETAIL_DATA pspdidd = (PSP_DEVICE_INTERFACE_DETAIL_DATA)Buf;
    pspdidd->cbSize = sizeof(*pspdidd); 

    SP_DEVINFO_DATA spdd = {0};
    spdd.cbSize = sizeof(spdd);

    DWORD dwSize = 0;

    do 
    {

        if (!SetupDiOpenDeviceInterface(
            hDevInfo, 
            szIntfPath,
            0,
            &spdid))
        {
            break;
        }


        dwSize = sizeof(Buf);    
        if (!SetupDiGetDeviceInterfaceDetail(hDevInfo, &spdid, pspdidd, dwSize, &dwSize, &spdd))
        {
            break;
        }

        //INFO(TEXT("DevicePath = %s\n"), pspdidd->DevicePath);
        if(SetupDiClassNameFromGuid(&spdd.ClassGuid, szTemp, MAX_PATH, &dwSize))
        {
            INFO(TEXT("Class = %s\n"), szTemp);
        }

        if (SetupDiGetClassDescription(&spdd.ClassGuid, szTemp, MAX_PATH, &dwSize))
        {
            INFO(TEXT("ClassDescription = %s\n"), szTemp);
        }


        if (SetupDiGetDeviceRegistryProperty(hDevInfo, &spdd, SPDRP_DEVICEDESC, NULL, (PBYTE)szTemp, MAX_PATH - 1, NULL))         
        {
            INFO(TEXT("DeviceDesc = %s\n"), szTemp);
        }

        if (SetupDiGetDeviceRegistryProperty(hDevInfo, &spdd, SPDRP_SERVICE, NULL, (PBYTE)szTemp, MAX_PATH - 1, NULL))         
        {
            INFO(TEXT("Service = %s\n"), szTemp);
        }

        if (SetupDiGetDeviceRegistryProperty(hDevInfo, &spdd, SPDRP_LOCATION_PATHS, NULL, (PBYTE)szTemp, MAX_PATH - 1, NULL))         
        {
            INFO(TEXT("LocationPath = %s\n"), szTemp);
        }


        if (SetupDiGetDeviceRegistryProperty(hDevInfo, &spdd, SPDRP_FRIENDLYNAME, NULL, (PBYTE)szTemp, MAX_PATH - 1, NULL))         
        {
            INFO(TEXT("FriendlyName = %s\n"), szTemp);
        }

        GetLocationInfo(spdd.DevInst, szTemp, MAX_PATH);


        INFO(TEXT("\n"));
    }
    while (0);

    SetupDiDestroyDeviceInfoList(hDevInfo);

}

老夫电脑测试输出如下: