qt启动后检测u盘插入和拔掉

最新推荐文章于 2025-03-24 21:00:00 发布

directx3d_beginner

最新推荐文章于 2025-03-24 21:00:00 发布

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分类专栏：遇到的技术问题文章标签： qt ui 开发语言

本文链接：https://blog.youkuaiyun.com/directx3d_beginner/article/details/129178624

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工作中，需要检测u盘的插入和拔掉。其余逻辑可以简化。
查了半天，感谢@q62290798

链接在
https://blog.youkuaiyun.com/q62290798/article/details/115869367?utm_medium=distribute.pc_relevant.none-task-blog-2_defaultbaidujs_baidulandingword~default-1-115869367-blog-100083606.pc_relevant_3mothn_strategy_and_data_recovery&spm=1001.2101.3001.4242.2&utm_relevant_index=4

总结下
1，派生自QAbstractNativeEventFilter类
2，重写nativeEventFilter，通过WM_DEVICECHANGE，DBT_DEVICEARRIVAL，DBT_DEVICEREMOVECOMPLETE判断是否u盘插入和拔出。
3，在main()函数注册

废话不多说，贴代码如下
#pragma once

#include <QtWidgets/QMainWindow>
#include “ui_USBDisck.h”
#include
#include <Windows.h>
#include <Dbt.h>
#include <qdir.h>
#include <qdesktopwidget.h>
#include <qprocess.h>
#include <qcheckbox.h>
#include <qabstractnativeeventfilter.h>

class USBDisck : public QMainWindow, public QAbstractNativeEventFilter
{
Q_OBJECT

public:
USBDisck(QWidget *parent = Q_NULLPTR);

private:
Ui::USBDisckClass ui;

private:
bool nativeEventFilter(const QByteArray &eventType, void *message, long *result);

};

#include “USBDisck.h”
#include
#include <QtCore/QCoreapplication.h>

USBDisck::USBDisck(QWidget *parent)

QMainWindow(parent)
{
ui.setupUi(this);
}

bool USBDisck::nativeEventFilter(const QByteArray & eventType, void * message, long * result)
{
MSG* msg = reinterpret_cast<MSG*> (message);
int msgType = msg->message;
if (msgType == WM_DEVICECHANGE)
{
PDEV_BROADCAST_HDR lpdb = (PDEV_BROADCAST_HDR)msg->lParam;
switch (msg->wParam)
{
case DBT_DEVICEARRIVAL:
{
qDebug() << “usb arrived!”;
}
break;

	case DBT_DEVICEREMOVECOMPLETE:
	{
		qDebug() << "Remove usb";
	}
	break;
	default:
		break;
	}
}
return false;

}

#include “USBDisck.h”
#include <QtWidgets/QApplication>

int main(int argc, char *argv[])
{
QApplication a(argc, argv);
USBDisck w;
w.show();
a.installNativeEventFilter(&w);
return a.exec();
}