Question

C#能否实现监听USB口

Answer 1

原理就是，USB插上和拔出的时候，所有窗体都会接收到一个消息...
public void DeviceWatcher(Message message) {

if (message.Msg == WM_MESSAGES.WM_DEVICECHANGE) {

switch (message.WParam.ToInt32()) {

case WM_MESSAGES.DEVICE_MESSAGE.DBT_DEVICEARRIVAL:

// 新的USB设备

break;

case WM_MESSAGES.DEVICE_MESSAGE.DBT_DEVICEREMOVECOMPLETE:

// 一个USB设备被移除

break;
}
}
}

/// <summary>
/// windows消息的常量
/// </summary>
internal class WM_MESSAGES {

/// <summary>
/// 系统硬件改变发出的系统消息
/// </summary>
public const int WM_DEVICECHANGE = 0x219;

/// <summary>
/// 设备信息
/// </summary>
public class DEVICE_MESSAGE {

/// <summary>
/// 设备检测结束，并且可以使用
/// </summary>
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;
/// <summary>
/// 设备卸载或者拔出
/// </summary>
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;
}
}

Answer 2

监听串口才行，你给把usb转成串口来弄，或者找找这程控件

追问

恩，想过这种方案。谢谢你