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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