C++ Qt 识别U盘/串口

头文件：

#include <Windows.h> // 包含 Windows API 头文件
#include <Dbt.h> // 包含设备通知相关的头文件

识别U盘：

//.h
bool nativeEvent(const QByteArray &eventType,
    void *message,
    long *result) override;

bool nativeEvent(const QByteArray &eventType,
  void *message,
  long *result)
{
  Q_UNUSED(eventType)
    MSG* msg = (MSG*)message;
  if (msg->message == WM_DEVICECHANGE)
  {
    if (msg->wParam == DBT_DEVICEARRIVAL)
    {
      PDEV_BROADCAST_HDR devHdr = (PDEV_BROADCAST_HDR)msg->lParam;
      if (devHdr->dbch_devicetype == DBT_DEVTYP_VOLUME)
      {
        //U盘插入, 更新驱动器列表
       
      }
      *result = 0;
    }
    else if (msg->wParam == DBT_DEVICEREMOVECOMPLETE)
    {
      PDEV_BROADCAST_HDR devHdr = (PDEV_BROADCAST_HDR)msg->lParam;
      if (devHdr->dbch_devicetype == DBT_DEVTYP_VOLUME)
      {
        //U盘拔出, 更新驱动器列表
        
      }
      *result = 0;
    }
  }
  return false;//返回false表明该消息接着向下传递，以便其它应用处理该消息。
}

识别虚拟串口：

//.h
bool handleVirtualSerialPortEvent(MSG* msg, long* result)；
bool nativeEvent(const QByteArray &eventType,
    void *message,
    long *result) override;

bool handleVirtualSerialPortEvent(MSG* msg, long* result)
{
  if (msg->message == WM_DEVICECHANGE)
  {
    if (msg->wParam == DBT_DEVICEARRIVAL)
    {
      PDEV_BROADCAST_HDR devHdr = (PDEV_BROADCAST_HDR)msg->lParam;
      if (devHdr->dbch_devicetype == DBT_DEVTYP_PORT)
      {
        // 处理虚拟串口插入事件
      }
      *result = 0;
    }
    else if (msg->wParam == DBT_DEVICEREMOVECOMPLETE)
    {
      PDEV_BROADCAST_HDR devHdr = (PDEV_BROADCAST_HDR)msg->lParam;
      if (devHdr->dbch_devicetype == DBT_DEVTYP_PORT)
      {
        // 处理虚拟串口拔出事件
      }
      *result = 0;
    }
    else if (msg->wParam == DBT_DEVNODES_CHANGED)
    {
      // 处理虚拟串口节点变化事件，如果串口连接，可能会不触发拔出事件
      
      *result = 0;
    }
  }
  return false;
}

bool nativeEvent(const QByteArray &eventType, void *message, long *result)
{
  Q_UNUSED(eventType)
    MSG* msg = (MSG*)message;
  return handleVirtualSerialPortEvent(msg, result);
}

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