调用devcon.exe控制usb设备

     3天前跟硕哥聊天时，他给我发了个有意思的程序--控制usb设备的拔插。当时我正好看到cookbook的IO处理，就觉得肯定是手到擒来（bs下自己）。第二天才开始动手，随手按照cookbook上的写了个：

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private void InitUsbDrives()  {    DriveInfo[] allDrives = DriveInfo.GetDrives();     foreach (DriveInfo d in allDrives)     {                 if (d.DriveType == DriveType.Removable)                 {                     listUsbDrives.Items.Add(d.Name);                 }      } }

结果什么也没有显示。这就奇怪了，这是为什么呢？原来GetDrives()方法只是获取逻辑盘符。我当时电脑上没有插入u盘，当然就没有显示咯。而硕哥发给我的程序显示的是所有usb接口的。那我就去搜，首先是msdn上关于io命名空间的查看，但是没有什么收获。只好求助google，什么遍历usb接口，监听usb接口，侦听usb端口，查看所有usb端口，跟usb相关的都找了。网上最多的是一个usb接口类的编写，但是没有实质的内容。当然，还是搜索到一定成果。比如有个也很多的监听方法：

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public const int WM_DEVICECHANGE = 0x219;         public const int DBT_DEVICEARRIVAL = 0x8000;         public const int DBT_CONFIGCHANGECANCELED = 0x0019;         public const int DBT_CONFIGCHANGED = 0x0018;         public const int DBT_CUSTOMEVENT = 0x8006;         public const int DBT_DEVICEQUERYREMOVE = 0x8001;         public const int DBT_DEVICEQUERYREMOVEFAILED = 0x8002;         public const int DBT_DEVICEREMOVECOMPLETE = 0x8004;         public const int DBT_DEVICEREMOVEPENDING = 0x8003;         public const int DBT_DEVICETYPESPECIFIC = 0x8005;         public const int DBT_DEVNODES_CHANGED = 0x0007;         public const int DBT_QUERYCHANGECONFIG = 0x0017;         public const int DBT_USERDEFINED = 0xFFFF;   protected override void WndProc(ref Message m)         {             try             {                 if (m.Msg == WM_DEVICECHANGE)                 {                     switch (m.WParam.ToInt32())                     {                         case WM_DEVICECHANGE:                             break;                         case DBT_DEVICEARRIVAL://U盘有插入                             this.timer1.Enabled = true;                             DriveInfo[] s = DriveInfo.GetDrives();                             foreach (DriveInfo DriveI in s)                             {                                 if (DriveI.DriveType == DriveType.Removable)                                 {                                    // Ls.Show();                                    // this.Hide();                                    // MessageBox.Show("sss");                                                                          break;                                 }                                 int devType = Marshal.ReadInt32(m.LParam, 4);                                 if (devType == DBT_DEVTYP_VOLUME)                                 {                                     DEV_BROADCAST_VOLUME vol;                                     vol = (DEV_BROADCAST_VOLUME)Marshal.PtrToStructure(m.LParam, typeof(DEV_BROADCAST_VOLUME));                                     ID=vol.dbcv_unitmask.ToString("x");                                     this.Text = IO(ID);                                    this.Tag = IO(ID);                                    //if (item.Length ==0||IO(ID)!=this.Tag.ToString ())                                    //{                                                                            //}                                 }                                 this.label1.Text = this.Text;                             }                             break;                         case DBT_CONFIGCHANGECANCELED:                             break;                         case DBT_CONFIGCHANGED:                             break;                         case DBT_CUSTOMEVENT:                             break;                         case DBT_DEVICEQUERYREMOVE:                             break;                         case DBT_DEVICEQUERYREMOVEFAILED:                             break;                         case DBT_DEVICEREMOVECOMPLETE: //U盘卸载                             DriveInfo[] I = DriveInfo.GetDrives();                             foreach (DriveInfo DrInfo in I)                             {                                 int devType = Marshal.ReadInt32(m.LParam, 4);                                 if (devType == DBT_DEVTYP_VOLUME)                                 {                                     DEV_BROADCAST_VOLUME vol;                                     vol = (DEV_BROADCAST_VOLUME)Marshal.PtrToStructure(m.LParam, typeof(DEV_BROADCAST_VOLUME));                                     ID = vol.dbcv_unitmask.ToString("x");                                     this.Text = IO(ID) + "盘退出！\n";                                                                                                           }                                 this.label1.Text += this.Text;                                // MessageBox.Show("U盘已经卸载", "信息提示", MessageBoxButtons.OK, MessageBoxIcon.Information);                             }                             break;                         case DBT_DEVICEREMOVEPENDING:                             break;                         case DBT_DEVICETYPESPECIFIC:                             break;                         case DBT_DEVNODES_CHANGED:                             break;                         case DBT_QUERYCHANGECONFIG:                             break;                         case DBT_USERDEFINED:                             break;                         default:                             break;                     }                 }             }             catch (Exception ex)             {                 throw new Exception(ex.Message);             }             base.WndProc(ref m);         }

这个代码有几个版本，但大致都是差不多的，就是重写WndProc(ref Message m)，判断传入的消息是否为u盘插入信息，然后显示u盘此时的盘符。有个比较好的版本，还可以启用
和禁用usb端口。但是这不是我需要的效果。继续找寻，在csdn某个问题贴中又找到一点有用的信息:

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string[] comPorts = System.IO.Ports.SerialPort.GetPortNames(); foreach(string s in comPorts) {    listUsbDrives.Items.Add(s); }

 

 

显示出了com1和com2两个结果，自我感觉离真相不远了。SerialPort是串口的意识，那是不是有UsbPort呢？马上兴奋地查看msdn，结果失望了。
不存在！而且唯一有的就是SerialPort。但是提供了我一个思路，usb是计算机的物理端口，那么我查看计算机信息不就有么？有这个类来帮助我查看吗？
是有的，System.Management。但是自己不太会用，就有google了一下。大致用法如此：

 

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private ManagementClass mc; private ManagementObjectCollection moc; private void InitUsbDrives() {             mc = new ManagementClass("Win32_USBController");             moc = mc.GetInstances();             String USBInfo = string.Empty;             foreach (ManagementObject mo in moc)             {                 foreach (PropertyData pd in mo.Properties)                 {                       if (pd.Name.Equals("DeviceID"))                     {                         USBInfo = pd.Value + "\n";                     }                     if (pd.Name.Equals("Manufacturer"))                     {                         USBInfo = USBInfo + " 厂商:" + pd.Value + "\n";                     }                     else if (pd.Name.Equals("Name"))                     {                         USBInfo = USBInfo + " USB控制器名称:" + pd.Value + "\n";                     }                     else if (pd.Name.Equals("Status"))                     {                         USBInfo = USBInfo + " USB状态态:" + pd.Value + "\n";                     }                     else if (pd.Name.Equals("PNPDeviceID"))                     {                         USBInfo = USBInfo + " USB控制器ID:" + pd.Value;                     }                   }                 listUsbDrives.Items.Add(USBInfo);             } }

 

但是这样并不能按我想要的方式显示，然后感觉肯定和Win32_USBController有关系，所以继续上msdn。查看了改函数：
http://msdn.microsoft.com/en-us/library/aa394504(VS.85).aspx
只有英文的，所以边看边翻译。将可能是的参数试了个遍，这下终于八九不离十了。就打算动手写，这时，这时~我注意到硕哥发我的rar中
有个devcon.exe。这东西是什么呢？于是借助Reflector查看了下硕哥发我的程序。发现真是调用这个东东，继续google下，发现这个工具很好用。
devcon帮助文档：http://hapeacock.blog.51cto.com/193534/86899
devcon设备启用和禁用：http://www.clxp.net.cn/article.asp?id=443
C#cookbook的IO中正好有关于命令行交互的，于是乎，很晚了，就去睡了。躺在床上就在想，该怎么写呢？ 第二天起来后就继续工作：

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1	首先是cmd的调用：

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public static string RunProcessCmd(string command)         {             Process application = new Process();             application.StartInfo.FileName = @"cmd.exe";             application.StartInfo.Arguments = "/c" + command;             application.StartInfo.RedirectStandardInput = true;             application.StartInfo.RedirectStandardOutput = true;             application.StartInfo.UseShellExecute = false;             application.StartInfo.CreateNoWindow = true;             application.Start();             application.StandardInput.WriteLine("exit");             string str = application.StandardOutput.ReadToEnd();             application.Close();             return str;         }

接下来是运行devcon：

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private void InitUsbDrives()        {            string[] drives = Regex.Split(RunProcessCmd("devcon.exe status usb*"), "\\.\r\n");            listUsbDrives.Items.Clear();            int index = 1;            foreach (string s in drives)            {                string[] strDives = Regex.Split(s, "   ");                if (strDives.Length == 3)                {                    Drives _drives = new Drives()                                         {                                             ID = strDives[0],                                             Name = index + ": " + strDives[1].Substring(6),                                             Status = strDives[2]                                         };                    listUsbDrives.Items.Add(_drives);                }                             }

费了些周折，总算是完成了。上个图：