初學Qt線程，此實例只是對Qt單一線程的使用，另外結合信號槽實現ui界面與子線程之間數據的傳輸，可以解決線程在運行的過程中，關閉對話框程序崩潰的問題。

此實例要實現的效果圖如下：

界面控件的類，對象表如下：

界面啟動后，起初停止線程按鈕是置灰的，點擊開始線程按鈕，停止線程按鈕不再置灰，在textBrowser中顯示1 2 3 4…等數字，點擊停止線程按鈕會停止打印，注:點擊停止線程后不會立即停止打印，而是有一定的延時，再次點擊開始線程按鈕，textBrowser中繼續顯示數字，只要顯示的數字小于某一個數值，不點擊停止線程按鈕或者關閉對話框，線程就會一直運行，另外可以在點擊開始線程按鈕前后，可以點擊GetTime按鈕和Smile按鈕。
可以分為線程類的編寫，對話框類對線程的使用，代碼如下：
MyThread.h

#ifndef MYTHREAD_H #define MYTHREAD_H#include <QObject> #include <QThread> #include <QMutex>class MyThread : public QThread {Q_OBJECT public:MyThread(QObject * parent = nullptr);~MyThread(); protected:void run(); public:void DoSomething();void DislaySomthing();void StopThread(); signals:void signGetTime(QString &strTime);void signString(const QString &str);void signSmileString(const QString &str); private:qint32 m_a;bool m_Status;QMutex m_mutex; };#endif // MYTHREAD_H

MyThread.h.cpp

#include "mythread.h" #include <QDateTime>MyThread::MyThread(QObject * parent):QThread (parent),m_a(0),m_Status(false) {}MyThread::~MyThread() {}void MyThread::run() {m_Status = false;while(m_a < 30000){sleep(1);m_a++;emit signString(tr("%1 ").arg(m_a));QMutexLocker mutex(&m_mutex);if(m_Status){return ;}} }void MyThread::DoSomething() {QDateTime current_date_time =QDateTime::currentDateTime();QString current_date =current_date_time.toString("yyyy.MM.dd hh:mm:ss.zzz ddd");emit signGetTime(current_date); }void MyThread::DislaySomthing() {emit signSmileString(tr("if you belive yourself,you can do it at most persent of 99.")); }void MyThread::StopThread() {QMutexLocker mutex(&m_mutex);m_Status = true; }

Dialog.h

#ifndef DIALOG_H #define DIALOG_H#include <QDialog>class MyThread;namespace Ui { class Dialog; }class Dialog : public QDialog {Q_OBJECTpublic:explicit Dialog(QWidget *parent = nullptr);~Dialog();private slots:void on_pushButtonGetTime_clicked();void on_pushButtonSmile_clicked();void on_pushButtonStart_clicked();void on_pushButtonStop_clicked();void slotGetTime(QString & str);void slotDisplaySmile(const QString &str);void slotString(const QString &Str); private:Ui::Dialog *ui;MyThread *m_Thread; };#endif // DIALOG_H

Dialog.cpp

#include "dialog.h" #include "ui_dialog.h" #include "mythread.h"Dialog::Dialog(QWidget *parent) :QDialog(parent),ui(new Ui::Dialog) {ui->setupUi(this);m_Thread = new MyThread(this);connect(m_Thread,&MyThread::signGetTime,this,&Dialog::slotGetTime);connect(m_Thread,&MyThread::signSmileString,this,&Dialog::slotDisplaySmile);connect(m_Thread,&MyThread::signString,this,&Dialog::slotString); }Dialog::~Dialog() {if(m_Thread->isRunning()){m_Thread->StopThread();m_Thread->wait();}delete ui; }void Dialog::on_pushButtonGetTime_clicked() {m_Thread->DoSomething(); }void Dialog::on_pushButtonSmile_clicked() {m_Thread->DislaySomthing(); }void Dialog::on_pushButtonStart_clicked() {if(m_Thread->isRunning()){return ;}m_Thread->start();ui->pushButtonStop->setEnabled(true); }void Dialog::on_pushButtonStop_clicked() {m_Thread->StopThread();ui->pushButtonStop->setEnabled(false); }void Dialog::slotGetTime(QString &str) {ui->lineEditTime->setText(str); }void Dialog::slotDisplaySmile(const QString &str) {ui->textEditSmile->setText(str); }void Dialog::slotString(const QString &Str) {QString strSrc = ui->textBrowser->toPlainText();strSrc += Str;ui->textBrowser->setText(strSrc); }

main.cpp

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

以上是一個簡單的線程，總結下來，繼承QThread的線程類，必須在該類中重寫run()函數，在run()函數中編寫線程要做的事，線程啟動時通過線程類對象或指針調用start()函數，線程關閉時可以使用bool變量來控制線程的關閉，也可通過quit(),wait()來等待線程的關閉，不建議使用terminate()來終止正在運行的線程，因為這樣線程的終止取決于系統的調用策略，即隨機調用性。

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