Qt listens for USB device insertion and Removal

Refer to online materials and use QT to implement

#ifndef WIDGET_H#define WIDGET_H #include <QtGui/QWidget>#include <windows.h>#include <QString> class Widget : public QWidget{Q_OBJECT public:Widget(QWidget *parent = 0);~Widget(); protected:bool winEvent(MSG *msg, long *result); private://UsbConfig usbConfig;char FirstDriveFromMask (ULONG unitmask);}; #endif // WIDGET_H

# Include "qt_watch/qwidget. H "# include <qdebug> # include <windows. h> # include <DBT. h> Widget: widget (qwidget * parent): qwidget (parent) {setwindowflags (QT: Window); // window uses window as the parent window} Widget ::~ Widget () {} bool Widget: winevent (MSG * MSG, long * result) {int msgtype = MSG-> message; If (msgtype = wm_devicechange) {qdebug () <"receive event"; pdev_broadcast_hdr lpdb = (pdev_broadcast_hdr) MSG-> lparam; Switch (MSG-> wparam) {Case dbt_devicetypespecpacific: {qdebug () <"Warn "; break;} case dbt_devicearrival: If (lpdb-> dbch_devicetype = dbt_devtyp_volume) {pdev_broadcast_volume lpdbv = (bytes) lpdb; if) {// insert a USB flash drive. Here you can do what you want to do: qstring usbdisk = qstring (this-> firstdrivefrommask (lpdbv-> dbcv_unitmask); qdebug () <"usb_arrived and the usbdisk is:" <usbdisk ;}} qdebug () <"dbt_devicearrival"; break; case when: If (lpdb-> dbch_devicetype = dbt_devtyp_volume) {pdev_broadcast_volume lpdbv = (pdev_broadcast_volume) lpdb; If (lpdbv-> dbcv_flags = 0) {qdebug () <"USB _ DEVICE removal" ;}} qdebug () <"dbt_deviceremovecomplete"; break ;}return false;} Char Widget: firstdrivefrommask (ulong unitmask) {char I; for (I = 0; I <26; ++ I) {If (unitmask & 0x1) break; unitmask = unitmask> 1 ;}return (I + 'A ');}

#include <QApplication>#include "qt_Watch/qwidget.h"int main(int argc,char ** argv){QApplication app(argc,argv);Widget widget;widget.show();return app.exec();}