c#程序读取usb数据

Question

嗨，这是我的毕业设计的程序，从usb读取，但即使我连接usb到电脑，它给我每次“设备找不到”，请帮助我

代码：

namespace Grad_pro
{
    public class read_data
    {
        public static UsbDevice MyUsbDevice;

        #region SET YOUR USB Vendor and Product ID!

        public static UsbDeviceFinder MyUsbFinder =
            new UsbDeviceFinder(0x0000, 0x0000); // specify vendor, product id

        #endregion

        public static void Main(string[] args)
        {
            ErrorCode ec = ErrorCode.None;

            try
            {
                // Find and open the usb device.
                MyUsbDevice = UsbDevice.OpenUsbDevice(MyUsbFinder);

                // If the device is open and ready
                if (MyUsbDevice == null) throw new Exception("Device Not Found.");

                // If this is a "whole" usb device (libusb-win32, linux libusb)
                // it will have an IUsbDevice interface. If not (WinUSB) the
                // variable will be null indicating this is an interface of a
                // device.
                IUsbDevice wholeUsbDevice = MyUsbDevice as IUsbDevice;
                if (!ReferenceEquals(wholeUsbDevice, null))
                {
                    // This is a "whole" USB device. Before it can be used,
                    // the desired configuration and interface must be selected.

                    // Select config
                    wholeUsbDevice.SetConfiguration(1);

                    // Claim interface
                    wholeUsbDevice.ClaimInterface(1);
                }

                // open read endpoint
                UsbEndpointReader reader =
                    MyUsbDevice.OpenEndpointReader(ReadEndpointID.Ep02);

                // open write endpoint
                UsbEndpointWriter writer =
                    MyUsbDevice.OpenEndpointWriter(WriteEndpointID.Ep03);

                // write data, read data
                int bytesWritten;
                ec = writer.Write(new byte[] { 0x00, 0x00 }, 2000, out bytesWritten); // specify data to send

                if (ec != ErrorCode.None)
                    throw new Exception(UsbDevice.LastErrorString);

                byte[] readBuffer = new byte[1024];
                while (ec == ErrorCode.None)
                {
                    int bytesRead;

                    // If the device hasn't sent data in the last 100 milliseconds,
                    // a timeout error (ec = IoTimedOut) will occur.
                    ec = reader.Read(readBuffer, 100, out bytesRead);

                    if (bytesRead == 0) throw new Exception("No more bytes!");

                    // Write that output to the console.
                    Console.WriteLine(BitConverter.ToString(readBuffer, 0, bytesRead));
                }

                Console.WriteLine("\r\nDone!\r\n");
            }
            catch (Exception ex)
            {
                Console.WriteLine();
                Console.WriteLine((ec != ErrorCode.None ? ec + ":" : String.Empty) + ex.Message);
            }
            finally
            {
                if (MyUsbDevice != null)
                {
                    if (MyUsbDevice.IsOpen)
                    {
                        // If this is a "whole" usb device (libusb-win32, linux libusb-1.0)
                        // it exposes an IUsbDevice interface. If not (WinUSB) the
                        // 'wholeUsbDevice' variable will be null indicating this is
                        // an interface of a device; it does not require or support
                        // configuration and interface selection.
                        IUsbDevice wholeUsbDevice = MyUsbDevice as IUsbDevice;
                        if (!ReferenceEquals(wholeUsbDevice, null))
                        {
                            // Release interface
                            wholeUsbDevice.ReleaseInterface(1);
                        }

                        MyUsbDevice.Close();
                    }
                    MyUsbDevice = null;

                    // Free usb resources
                    UsbDevice.Exit();

                }

                // Wait for user input..
                Console.ReadKey();
            }
        }
    }
}

Answer 1

目前，LibUsbDotNet库似乎正在经历一些变化。我没有幸运地让任何旧版本的库工作。但是，有一个alpha版本确实可以工作。我向他们提交了这个sample，它被接受了。它适用于我正在与之交谈的设备(只要您向libusb dll添加一个物理引用。

但是，我不推荐使用LibUsb。LibUSb只是标准Windows USB和Hid API调用的C包装器。如果你想要一些与Linux跨平台的东西，这是很有用的，但是据我所知，LibUsb不支持其他平台。

我建议直接使用Windows Hid和USB API。这些是Usb.Net and Hid.Net的一部分。如果您确实需要保持代码与Linux的跨平台，您仍然可以使用多态性来wrap Linux上的LibUsbDotNet库：