相关疑难解决方法(0)

我尝试在Windows 7上使用WIA 2.0,C#,.net 4.0从网络摄像头拍照.我尝试了许多不同的样本,但没有任何效果.我总是得到这个异常:"ComException未处理"来自HRESULT的异常:0x80210015".代码是WIA_S_NO_DEVICE_AVAILABLE.我检查过,如果WIA-Service正在运行,并且凸轮出现在扫描仪和相机中.我不知道这里有什么问题!可以有人帮忙吗？

此行抛出异常:

设备d = class1.ShowSelectDevice(WiaDeviceType.CameraDeviceType,true,false);:

这里的代码

string DeviceID;

    const string wiaFormatBMP = "{B96B3CAB-0728-11D3-9D7B-0000F81EF32E}";
    const string wiaFormatPNG = "{B96B3CAF-0728-11D3-9D7B-0000F81EF32E}";
    const string wiaFormatGIF = "{B96B3CB0-0728-11D3-9D7B-0000F81EF32E}";
    const string wiaFormatJPEG = "{B96B3CAE-0728-11D3-9D7B-0000F81EF32E}";
    const string wiaFormatTIFF = "{B96B3CB1-0728-11D3-9D7B-0000F81EF32E}";


    class WIA_DPS_DOCUMENT_HANDLING_SELECT
    {
        public const uint FEEDER = 0x00000001;
        public const uint FLATBED = 0x00000002;
    }

    class WIA_DPS_DOCUMENT_HANDLING_STATUS
    {
        public const uint FEED_READY = 0x00000001;
    }

    class WIA_PROPERTIES
    {
        public const uint WIA_RESERVED_FOR_NEW_PROPS = 1024;
        public const uint WIA_DIP_FIRST = …