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案例需求：利用QT线程操作，实现拷贝复制文件操作

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代码：

myfile.h

#ifndef MYFILE_H
#define MYFILE_H#include <QObject>
#include <QDebug>
#include <QThread>
#include <QFile>
#include <QtWidgets>
class MyFile : public QObject
{Q_OBJECT
public:explicit MyFile(QObject *parent = nullptr);void thread_file(QString path);
signals:void my_signal(); // 失败信号void success_signal(); // 成功信号
public slots:
};#endif // MYFILE_H

widget.h

#ifndef WIDGET_H
#define WIDGET_H#include <QWidget>
#include <QDebug>
#include <QThread>
#include "myfile.h"
namespace Ui {
class Widget;
}class Widget : public QWidget
{Q_OBJECTpublic:explicit Widget(QWidget *parent = nullptr);~Widget();private slots:void on_pushButton_clicked();
signals:void sendsignal(QString path);
private:Ui::Widget *ui;QThread *thread;MyFile *file;
};#endif // WIDGET_H

myfile.cpp

#include "myfile.h"MyFile::MyFile(QObject *parent) : QObject(parent)
{}void MyFile::thread_file(QString path)
{if(path.isEmpty()){qDebug()<<"取消选择"<<endl;emit my_signal();return ;}else{qDebug()<<path<<endl;QFile file(path);if(!file.open(QIODevice::ReadOnly)){qDebug()<<"读取失败";emit my_signal();return ;}QString writepath = "./writefile.cpp";QFile writefile(writepath);if(!writefile.open(QIODevice::WriteOnly|QIODevice::Truncate)){qDebug()<<"新建失败";emit my_signal();return ;}while(!file.atEnd()){ // 拷贝QByteArray buf;file.read(1024);writefile.write(buf);}// 关闭文件file.close();writefile.close();emit success_signal();}
}

widget.cpp

#include "widget.h"
#include "ui_widget.h"
#include <QDebug>
#include <QThread>
#include "myfile.h"Widget::Widget(QWidget *parent) :QWidget(parent),ui(new Ui::Widget)
{ui->setupUi(this);thread = new QThread(this);file = new MyFile;file->moveToThread(thread);//connect(thread,&QThread::started,file,&MyFile::thread_file);connect(this,&Widget::destroyed,this,[=](){thread->quit();thread->wait();});connect(file,&MyFile::my_signal,this,[=](){ // 只能在主线程对界面进行操作this->ui->label->setText("COPY失败");});connect(file,&MyFile::success_signal,this,[=](){this->ui->label->setText("COPY完成");});
}Widget::~Widget()
{delete ui;
}void Widget::on_pushButton_clicked()
{QString path = QFileDialog::getOpenFileName(this,tr("打开文件"),"./","Text filex(*.cpp)");connect(this,&Widget::sendsignal,file,&MyFile::thread_file);emit sendsignal(path);this->ui->label->setText("开始拷贝");thread->start();
}

ui

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输出：