[英]C# SerialDevice no port information (Raspberry Pi 3)
I have two USB receivers for bar-code scanners connected to a raspberry pi3 (Windows IOT Core). 我有两个用于条形码扫描仪的USB接收器,它们连接到树莓派pi3(Windows IOT核心)。
I can connect to them and list the USB Virtual COM devices and connect to them and receive data. 我可以连接到它们并列出USB虚拟COM设备,然后连接到它们并接收数据。 But I can't differentiate between the two, the IDs are identical and the system is not providing Port numbers.
但是我无法区分两者,ID相同,系统未提供端口号。
When I call Current.portnumber.ToString() the string is empty. 当我调用Current.portnumber.ToString()时,字符串为空。
I am hoping to assign each device to a person and have them scan a bar-code for their username and would like to display which scanner is associated with which person (Such as Com5 = Bill Com6 = Dave) but just can't find a unique identifier for each virtual com 我希望将每个设备分配给一个人,让他们扫描条形码以查找其用户名,并希望显示与哪个人关联的扫描仪(例如Com5 = Bill Com6 = Dave),但找不到每个虚拟com的唯一标识符
private async void ListAvailablePorts()
{
try
{
string aqs = SerialDevice.GetDeviceSelector();
var infos = await DeviceInformation.FindAllAsync(aqs);
foreach (var info in infos)
{
var serialDevice = await SerialDevice.FromIdAsync(info.Id);
DeviceInformation Current = info as DeviceInformation;
if (serialDevice != null && Current.Name == "USB Virtual COM")
{
listOfDevices.Add(Current);
ComList.Items.Add(Current.Name.ToString());
}
}
DeviceList.ItemsSource = listOfDevices;
ComList.SelectedIndex = -1;
DeviceList.SelectedIndex = -1;
}
catch (Exception ex)
{
txtUser.Text = ex.Message;
}
}
After additional scrutiny I found that the ID fields are different on a single digit within an 86 character string. 经过进一步的审查,我发现ID字段在86个字符串中的一位数字上有所不同。
\\\\?\\USB#VID_0416&PID_5011#5&3753427a&0& 5 #{86e0d1e0-8089-11d0-9ce4-08003e301f73} \\\\?\\ USB#VID_0416&PID_5011#5&3753427a&0& 5 #{86e0d1e0-8089-11d0-9ce4-08003e301f73}
VS VS
\\\\?\\USB#VID_0416&PID_5011#5&3753427a&0& 2 #{86e0d1e0-8089-11d0-9ce4-08003e301f73} \\\\?\\ USB#VID_0416&PID_5011#5&3753427a&0& 2 #{86e0d1e0-8089-11d0-9ce4-08003e301f73}
Thanks 谢谢
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