WIA不会退还所有设备

问题描述

我正在尝试使用C#开发远程图像扫描服务.当我调用以下函数时，它仅返回2个WIA设备(扫描仪).但是我的系统(xp)安装了4个WIA设备，包括2个无线扫描仪(一个Brother和一个Samsung scx 3200w无线扫描仪).当我尝试使用其他应用程序(例如photoshop)获取图像时，它会显示所有4种设备.请帮助-谢谢

i am trying to develop a remote image scanning service in c#. when i call the following function, it returns only 2 WIA devices (scanners). But my system (xp) is having 4 WIA devices installed, including 2 wireless scanners (one Brother and one Samsung scx 3200w wireless scanners). when i try to acquire image using other app like photoshop, it shows all 4 devices. pl help- Thanks

public static List<string> GetDevices()
{
    List<string> devices = new List<string>();
    WIA.DeviceManager manager = new WIA.DeviceManager() ;

    foreach (WIA.DeviceInfo info in manager.DeviceInfos)
    {
        devices.Add(info.DeviceID);
    }

    return devices;
}

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