Qt之主线程与子线程通信（linux下）

http://blog.csdn.net/feng1790291543

主线程与子线程通信主要是通过Qt上的Gui按钮，触发使得主线程上的信息发送到子线程中，并且时刻监测线程的运行情况

主线程，头文件：

#ifndef MANAGEWIDGET_H#define MANAGEWIDGET_H#include <QtGui/QWidget>#include <QtCore>//#include "childwidget.h"//#include "simplethread.h"//class ChildWidget;class SimpleThread;namespace Ui{    class ManageWidget;}class ManageWidget : public QWidget{    Q_OBJECTpublic:    ManageWidget(QWidget *parent = 0);    ~ManageWidget();private:    Ui::ManageWidget *ui;    //ChildWidget *child;    QThread *child;    SimpleThread *simple;private slots:    void on_pushButton_clicked();    void on_pushButtonRunChild_clicked();    void on_pushButtonSend_clicked();    void StartReceive();    void FinishReceive();signals:    void SignalChild(QString str);};#endif // MANAGEWIDGET_H

源文件：

#include "managewidget.h"#include "ui_managewidget.h"#include "childwidget.h"#include "simplethread.h"ManageWidget::ManageWidget(QWidget *parent)    : QWidget(parent), ui(new Ui::ManageWidget){    ui->setupUi(this);    simple=new SimpleThread;    //child=new ChildWidget;    child=new QThread;    connect(this,SIGNAL(SignalChild(QString)),simple,SLOT(print_str(QString)));      connect(child,SIGNAL(started()),this,SLOT(StartReceive()));    //connect(child,SIGNAL(finished()),this,SLOT(FinishReceive()));}ManageWidget::~ManageWidget(){    delete ui;}void ManageWidget::StartReceive(){    qDebug()<<"thread is starting!";}void ManageWidget::FinishReceive(){    qDebug()<<"thread is finishing!";}void ManageWidget::on_pushButtonSend_clicked(){    QString str=ui->lineEditContent->text();    emit SignalChild(str);    return ;}void ManageWidget::on_pushButtonRunChild_clicked(){    qDebug()<<"Main Thread Id is "<<QThread::currentThreadId();    simple->moveToThread(child);    child->start();    return ;}void ManageWidget::on_pushButton_clicked(){    qDebug()<<"first isRuning---->"<<child->isRunning();    qDebug()<<"first isFinishing---->"<<child->isFinished();    child->quit();    child->wait();    qDebug()<<"second isRuning--->"<<child->isRunning();    qDebug()<<"second isFinishing---->"<<child->isFinished();    child->deleteLater();    delete child;}

子线程头文件：

#ifndef CHILDWIDGET_H#define CHILDWIDGET_H#include <QThread>#include <QtCore>class ChildWidget : public QThread{     Q_OBJECTpublic:    ChildWidget();    void run();};#endif // CHILDWIDGET_H

子线程源代码：

#include "childwidget.h"ChildWidget::ChildWidget(){}void ChildWidget::run(){    QString str="hello zhangsan";    qDebug()<<"子线程中的的run() is"<<str;    exec();    return ;}

中间独立线程：

#ifndef SIMPLETHREAD_H#define SIMPLETHREAD_H#include <QObject>#include <QtCore>class SimpleThread : public QObject{     Q_OBJECTpublic:    SimpleThread();private slots:    void print_str(QString str);};#endif // SIMPLETHREAD_H

源代码：

#include "simplethread.h"SimpleThread::SimpleThread(){}void SimpleThread::print_str(QString str){    qDebug()<<"Simple Thread is here..."<<str;    return ;}

运行效果：

只有一条路不能选择——那就是放弃的路;