在C#中使用LibUsbDotNet与USB设备通信

Question

0)在Windows7极限32位下工作，安装了linusb-win32-dlevel-过滤器1.2.6.0.

1)我尝试了libusb dotnet的展示信息示例，得到了如下结果，请查看结果(1-结果)。

2)之后，我试图读取(轮询) libusb的示例，但在"ec = reader.Read(readBuffer，1000，out bytesRead)“中得到了错误；错误是”win32Error:不再有字节！“请参阅代码(2-代码)

这个错误意味着什么?我如何解决它？实际上我在usb设备通信方面是新手，如果对使用c#的usb设备通信有什么想法，请帮助我。

1-结果：-

长度:18 DescriptorType:Device BcdUsb:0x0110类:Comm子类:0x00协议:0x00 MaxPacketSize0:64供应商Inc :0x11CA ProductID:0x0241 BcdDevice:0x0100 ManufacturerStringIndex:1 ProductStringIndex:2 SerialStringIndex:3 ConfigurationCount:1 ManufacturerString:VeriFone Inc ProductString:Trident 1.1 SerialString：

长度:9 DescriptorType:Configuration TotalLength:67 InterfaceCount:2 ConfigID:1 StringIndex:0 Attribute:0xC0 MaxPower:25 ConfigString：

长度:7 DescriptorType:终结点16:0x85属性:0x03 MaxPacketSize:16间隔:0 Refresh:0 SynchAddress:0x00

长度:9 DescriptorType:接口接口Interface:1 AlternateID:0 EndpointCount:2 Class:Data子类:0x00协议:0x00 StringIndex:0 InterfaceString：

长度:7 DescriptorType:端点EndpointID:0x81属性:0x02 MaxPacketSize:64 Interval:0 Refresh:0 SynchAddress:0x00

长度:7 DescriptorType:端点EndpointID:0x03属性:0x02 MaxPacketSize:32 Interval:0 Refresh:0 SynchAddress:0x00

2-“法典”:-

公共静态UsbDeviceFinder MyUsbFinder =新UsbDeviceFinder(4554,577)；

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.");

            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 #1
                wholeUsbDevice.SetConfiguration(1);

                // Claim interface #0.
                wholeUsbDevice.ClaimInterface(0);
            }

            // open read endpoint 1.
            UsbEndpointReader reader = MyUsbDevice.OpenEndpointReader(ReadEndpointID.Ep01);


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

                // If the device hasn't sent data in the last 5 seconds,
                // a timeout error (ec = IoTimedOut) will occur. 
                ec = reader.Read(readBuffer, 5000, out bytesRead);

                if (bytesRead == 0) throw new Exception(string.Format("{0}:No more bytes!", ec));
                Console.WriteLine("{0} bytes read", bytesRead);

                // Write that output to the console.
                Console.Write(Encoding.Default.GetString(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)
                {

                    IUsbDevice wholeUsbDevice = MyUsbDevice as IUsbDevice;
                    if (!ReferenceEquals(wholeUsbDevice, null))
                    {
                        // Release interface #0.
                        wholeUsbDevice.ReleaseInterface(0);
                    }

                    MyUsbDevice.Close();
                }
                MyUsbDevice = null;

                // Free usb resources
                UsbDevice.Exit();

            }

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

Answer 1

注意描述符，您必须将接口设置为1。

wholeUsbDevice.ClaimInterface(1)