C#: 监测 USB plugin and plugout

来源：互联网发布：哈喽聊天软件编辑：程序博客网时间：2024/06/07 03:18

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 { }

}