C#: 监测 USB plugin and plugout

It is useful to enum USB ports or connect to a USB device automatically while a USB device is plugged-in. I did lots of research to figure out how to make it work. Hope this can help you.

public void MonitorPlugout()
{
m_DataFlow.OnClose += OnDataFlowClose;
WqlEventQuery q;
ManagementScope scope = new ManagementScope("root//CIMV2");
scope.Options.EnablePrivileges = true;
try {
q = new WqlEventQuery();
q.EventClassName = "__InstanceDeletionEvent"; // "__InstanceOperationEvent";
q.WithinInterval = new TimeSpan(0, 0, 3);
q.Condition = @"TargetInstance ISA 'Win32_USBControllerDevice'";
m_outWatcher = new ManagementEventWatcher(scope, q);

m_outWatcher.EventArrived += new EventArrivedEventHandler(OnUSBPlugout);
m_outWatcher.Start();
}
catch { }
}

public void OnUSBPlugout(object sender, EventArrivedEventArgs e)
{
try {
string id = ((string[]) CDeviceControl.DeviceControl.Devices.GetCollection("SETTING")["USB"])[1];
foreach (PropertyData pd in e.NewEvent.Properties) {
ManagementBaseObject mbo = null;
if ((mbo = pd.Value as ManagementBaseObject) != null) {
foreach (PropertyData prop in mbo.Properties) {
if (prop.Value != null && ((string) prop.Value).Contains(id)) {
CUSB usb= (CUSB) m_DataFlow.Connection;
CDeviceContext.DeviceContext.MainForm.BeginInvoke((MethodInvoker) delegate()
{
m_outWatcher.Stop();
m_DataFlow.OnClose -= OnDataFlowClose;
CDeviceContext.DeviceContext.CloseAllChildFormsInMainForm();
CDataSet.DataSet.DataFlow.Close();
CDeviceContext.DeviceContext.SwitchContextToMain();
CDataSet.DataSet.DataFlow = null;
UsbMonitor = null;
Utility.CMessages.ShowInformationMessage(
"USB device was unplugged. Please check the connection. /n",
"USB");
});
}
}
}
}
}
catch { }
}

public void MonitorPlugin()
{
WqlEventQuery q;
ManagementScope scope = new ManagementScope("root//CIMV2");
scope.Options.EnablePrivileges = true;
try {
q = new WqlEventQuery();
q.EventClassName = "__InstanceCreationEvent";
q.WithinInterval = new TimeSpan(0, 0, 3);
q.Condition = @"TargetInstance ISA 'Win32_USBControllerDevice'";
m_inWatcher = new ManagementEventWatcher(scope, q);
m_inWatcher.EventArrived += new EventArrivedEventHandler(OnUSBPlugin);
m_inWatcher.Start();
}
catch { }
}

public void OnUSBPlugin(object sender, EventArrivedEventArgs e)
{
try {
string id = ((string[]) CDeviceControl.DeviceControl.Devices.GetCollection("SETTING")["USB"])[1];
foreach (PropertyData pd in e.NewEvent.Properties) {
ManagementBaseObject mbo = null;
if ((mbo = pd.Value as ManagementBaseObject) != null) {
foreach (PropertyData prop in mbo.Properties) {
if (prop.Value != null && ((string) prop.Value).Contains(id)) {
CDeviceContext.DeviceContext.MainForm.BeginInvoke((MethodInvoker) delegate()
{
Connect();
});
}
}
}
}
}
catch { }
}