LibUsbDotNet使用方法

最近在用C#调试USB程序，libusb源码是C语言的，C#用起来不方便，偶然在网上看到了LibUsbDotNet，这是开源的项目，下载后参考Example，用起来非常方便。

LibUsbDotNet下载 - http://sourceforge.net/projects/libusbdotnet/

我写的示例工程(附件传不上来，只能直接贴代码了^_^) - Enjoy...

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Threading;

using LibUsbDotNet;
using LibUsbDotNet.Info;
using LibUsbDotNet.Main;
using LibUsbDotNet.DeviceNotify;


using LibUsbDotNet.LibUsb;

 

namespace USBLib
{
     public  partial  class Form1 : Form
    {
         const  int myPID =  0x050F;   // 产品ID
         const  int myVID =  0x0425;   // 供应商ID

         public  static UsbDevice MyUsbDevice; // USB设备
         public  static DeviceNotifier DeviceNotifier =  new DeviceNotifier(); // 设备变化通知函数
         public  static UsbEndpointWriter writer =  null;
         public  static UsbEndpointReader reader =  null;

         delegate  void SetTextCallback( string text); // 安全线程访问txtReadInt的值


        Boolean EnbaleInt =  false; // 是否使用中断接收

         public Form1()
        {
            InitializeComponent();
        }

         private  void ShowCon( string msg)
        {
            lblConnState.Text = msg;
        }

         private  void ShowMsg( string msg)
        {
            lblMsg.Text = msg;
        }
     

         private  void Form1_Load( object sender, EventArgs e)
        {
             if (FindAndOpenUSB(myVID, myPID) ==  true)
                ShowCon( " 设备已连接 ");
             else
                ShowCon( " 设备未连接 ");

            DeviceNotifier.OnDeviceNotify += OnDeviceNotifyEvent;

            writer = MyUsbDevice.OpenEndpointWriter(WriteEndpointID.Ep03);
            reader = MyUsbDevice.OpenEndpointReader(ReadEndpointID.Ep02);

             if( EnbaleInt ==  true)
            {
                reader.DataReceived += (OnRxEndPointData);
                    reader.DataReceivedEnabled =  true;
            }

        }

         private  void Form1_FormClosing( object sender, FormClosingEventArgs e)
        {
            CloseUSB();
        }
 
         #region USB
         ///
         ///  初始化USB设备
         ///
         ///  设备PID
         ///  设备VID
         ///
         private  bool FindAndOpenUSB( int PID,  int VID)
        {
            UsbDeviceFinder MyUsbFinder =  new UsbDeviceFinder(PID, VID);
            UsbRegistry myUsbRegistry   = UsbGlobals.AllDevices.Find(MyUsbFinder);

             if (ReferenceEquals(myUsbRegistry,  null))
            {
                 return  false;
            }
             //  Open this usb device.
             if (!myUsbRegistry.Open( out MyUsbDevice))
            {
                 return  false;
            }

            MyUsbDevice.SetConfiguration( 1);

            ((LibUsbDevice)MyUsbDevice).ClaimInterface( 0);

            ShowMsg( string.Format( " Find Device:{0} ",myUsbRegistry[SPDRP.DeviceDesc]));
             return  true;
        }
         // 关闭USB设备
         public  void CloseUSB()
        {
             if (!ReferenceEquals(reader,  null))
                reader.Dispose();
             if (!ReferenceEquals(writer,  null))
                writer.Dispose();
             if (!ReferenceEquals(MyUsbDevice, null))
                MyUsbDevice.Close();
        }
         // 获得上次错误信息
         public  string GetLastError()
        {
             return UsbGlobals.LastErrorString;
        }
         // 设备变化消息相应函数
         private  void OnDeviceNotifyEvent( object sender, DeviceNotifyEventArgs e)
        {
             if (e.EventType == EventType.DeviceArrival)
            {
                ShowMsg( string.Format( " 发现有新USB设备连接，PID = 0x{0:X},VID = 0x{1:X}.\r\n设备的详细信息{2} ", e.Device.IdProduct, e.Device.IdVendor, e.Device.ToString()));
                 // 看看目前新连接的USB设备是不是目标设备
                 if (e.Device.IdProduct == myPID && e.Device.IdVendor == myVID)
                {
                    ShowMsg( " 该USB设备是目标设备 ");
                     // 发现目标设备并打开该设备
                    FindAndOpenUSB(myPID,myVID);
                }
                 else
                {
                    ShowMsg( " 该USB设备不是目标设备\r\n ");
                }
            }
             else  if (e.EventType == EventType.DeviceRemoveComplete)
            {

                ShowMsg( string.Format( " 发现有USB设备移除，PID = 0x{0:X}, VID = 0x{1:X}\r\n设备的详细信息{2} ", e.Device.IdProduct, e.Device.IdVendor, e.Device.ToString()));
                 // 看看目前移除的USB设备是不是目标设备
                 if (e.Device.IdProduct == myPID && e.Device.IdVendor == myVID)
                {
                    ShowMsg( string.Format( " 移除的USB设备是目标设备\r\n "));
                    CloseUSB();
                }
                 else
                {
                    ShowMsg( string.Format( " 移除的USB设备不是目标设备\r\n "));
                }
            }
        }
         // USB中断接收函数
         private  void OnRxEndPointData( object sender, EndpointDataEventArgs e)
        {
            // txtReadInt.Text = Encoding.Default.GetString(e.Buffer, 0, e.Count);
             // MessageBox.Show(Encoding.Default.GetString(e.Buffer, 0, e.Count));
            SetText(Encoding.Default.GetString(e.Buffer,  0, e.Count));
        }

         #endregion

         private  void btnSend_Click( object sender, EventArgs e)
        {
            ErrorCode ec = ErrorCode.None;
            
             int bytesWritten;
             try
            {
                ec = writer.Write(Encoding.Default.GetBytes(txtSend.Text),  2000,  out bytesWritten);
                 if (ec != ErrorCode.None)
                     throw  new Exception(UsbGlobals.LastErrorString);
            }
             catch (Exception ex)
            {
                ShowMsg( " Error: " + ex.Message);
            }
             finally
            {
               
            }
        }

         private  void btnRead_Click( object sender, EventArgs e)
        {
            ErrorCode ec = ErrorCode.None;
           
             byte[] readBuffer =  new  byte[ 1024];
             int bytesRead;
             try
            {
                ec = reader.Read(readBuffer,  100,  out bytesRead);
                 if (bytesRead ==  0)
                     throw  new Exception( " No more bytes! ");
                txtRead.Text = Encoding.Default.GetString(readBuffer,  0, bytesRead);
            }
             catch (Exception ex)
            {
                ShowMsg( " Error: " + ex.Message);
            }
             finally
            {
               
            }
        }
         // 线程安全访问txtReadInt
         private  void SetText( string text)
        {
             //  InvokeRequired required compares the thread ID of the
             //  calling thread to the thread ID of the creating thread.
             //  If these threads are different, it returns true.
             if ( this.txtReadInt.InvokeRequired)
            {
                SetTextCallback d =  new SetTextCallback(SetText);
                 this.Invoke(d,  new  object[] { text });
            }
             else
            {
                 this.txtReadInt.Text = text;
            }
        }

    }
}