使用Qt中的工作线程，模拟上传文件（需要用到定时器，线程知识）

头文件：

GBK.h

#ifndef _QT_GBK_H#define _QT_GBK_H#include <QString>#include <QTextCodec>#include <string>using std::string;class GBK{public:// QString(Unicode) -> std::string (GBK)static string FromUnicode(const QString& qstr){QTextCodec* pCodec = QTextCodec::codecForName("gb2312");if(!pCodec) return "";QByteArray arr = pCodec->fromUnicode(qstr);string cstr = arr.data();return cstr;}// std::string (GBK) -> QString(Unicode)static QString ToUnicode(const string& cstr){QTextCodec* pCodec = QTextCodec::codecForName("gb2312");if(!pCodec) return "";QString qstr = pCodec->toUnicode(cstr.c_str(), cstr.length());return qstr;}};#endif

mainwindow.h

#ifndef MAINWINDOW_H#define MAINWINDOW_H#include <QMainWindow>#include <QFileDialog>#include <QFile>#include <QString>#include "senddialog.h"namespace Ui {class MainWindow;}class MainWindow : public QMainWindow{    Q_OBJECTpublic:    explicit MainWindow(QWidget *parent = 0);    ~MainWindow();private:    Ui::MainWindow *ui;private slots:    int OnOpenBtnChicked();    int OnSendBtnChicked();};#endif // MAINWINDOW_H

senddialog.h

#ifndef SENDDIALOG_H#define SENDDIALOG_H#include <QDialog>#include "sendtask.h"#include <QTimer>#include <QTime>namespace Ui {class SendDialog;}class SendDialog : public QDialog{    Q_OBJECTpublic:    explicit SendDialog(const QString &filepath, QWidget *parent = 0);    ~SendDialog();    void timerEvent(QTimerEvent *event);//定时器函数private:    Ui::SendDialog *ui;    SendTask *m_task;    int m_timerId;//定时器ID};#endif // SENDDIALOG_H

sendtask.h（创建时基类选择继承于QThread）

#ifndef SENDTASK_H#define SENDTASK_H#include <QThread>#include <string>#include <string.h>class SendTask : public QThread{    Q_OBJECTpublic:    explicit SendTask(QObject *parent = 0);    int BeginTask(const char *filepath);//开始线程    void BendTask();//结束线程    int GetStatus();//获取状态    int GetProgress();//获取进度signals:public slots:private:    void run();    char m_filename[128];//打开文件名    int m_filesize;//文件字节数    int m_byteresed;//处理的总字节数    int m_status;//任务的状态};#endif // SENDTASK_H

源文件：

main.cpp

#include "mainwindow.h"#include <QApplication>int main(int argc, char *argv[]){    QApplication a(argc, argv);    MainWindow w;    w.show();    return a.exec();}

mainwindow.cpp

#include "mainwindow.h"#include "ui_mainwindow.h"MainWindow::MainWindow(QWidget *parent) :    QMainWindow(parent),    ui(new Ui::MainWindow){    ui->setupUi(this);    connect(ui->OpenButton,SIGNAL(clicked()),            this,SLOT(OnOpenBtnChicked()));    connect(ui->SendButton,SIGNAL(clicked()),            this,SLOT(OnSendBtnChicked()));}MainWindow::~MainWindow(){    delete ui;}int MainWindow::OnOpenBtnChicked(){    QString filepath = QFileDialog::getOpenFileName(this,"选择文件");    if(filepath.length() > 0)    {        ui->lineEdit->setText(filepath);    }    return 0;}int MainWindow::OnSendBtnChicked(){    QString filepath = ui->lineEdit->text();    SendDialog dlg(filepath,this);    dlg.exec();    return 0;}

senddialog.cpp

#include "senddialog.h"#include "ui_senddialog.h"#include <QTextCodec>#include "GBK.h"SendDialog::SendDialog(const QString &filepath,QWidget *parent) :    QDialog(parent),    ui(new Ui::SendDialog){    ui->setupUi(this);    string gbk_filepath = GBK::FromUnicode(filepath);    m_task = new SendTask;    m_task->BeginTask(gbk_filepath.c_str());    m_timerId = startTimer(200);}SendDialog::~SendDialog(){    delete ui;}void SendDialog::timerEvent(QTimerEvent *event){    if(event->timerId() == m_timerId)    {        int status = m_task->GetStatus();        int progess = m_task->GetProgress();        ui->progressBar->setValue(progess);        if(status == 1)        {            //结束线程            m_task->BendTask();            delete m_task;            //杀死定时器            killTimer(m_timerId);            this->accept();        }    }}

sendtask.cpp

#include "sendtask.h"#include <QDebug>SendTask::SendTask(QObject *parent) :    QThread(parent){}int SendTask::BeginTask(const char *filepath){    strcpy(m_filename,filepath);    m_filesize = 0;    m_byteresed = 0;    m_status = 0;    start();    return 0;}void SendTask::BendTask(){    wait();}int SendTask::GetStatus(){    return m_status;}int SendTask::GetProgress(){    if(m_filesize <= 0)    {        return 0;    }    return m_byteresed *100/m_filesize;}void SendTask::run(){    FILE *fpr = fopen(m_filename,"rb");    if(!fpr)    {        m_status = -1;  //状态发生错误        return;    }    fseek(fpr,0,SEEK_END);    m_filesize = ftell(fpr);    rewind(fpr);    char buf[1024*100];    while(1)    {        int n = fread(buf,1,1024*100,fpr);        if(n <= 0)        {            break;        }        m_byteresed += n;        qDebug() << "Read: " << m_byteresed;        QThread::msleep(200);    }    fclose(fpr);    m_status = 1;    qDebug() << "Complete...... ";}

界面设计：

mainwindow.ui（用到了pushButton，Lable标签，ToolButton，Line Edit）

senddialog.ui（用到了Progress Bar进度条）

注：选中Progress Bar 设置属性value为0可将进度条置零，如下图；

效果图：

注：用的MP3文件测试，MP3文件既不会太大，亦不会很小比较合适模拟效果