Qt Socket 客户端程序：连接、发送数据和断开连接

#ifndef MAINWINDOW_H #define MAINWINDOW_H

#include #include #include #include #include

namespace Ui { class MainWindow; }

class MainWindow : public QMainWindow { Q_OBJECT

public: explicit MainWindow(QWidget *parent = 0); ~MainWindow();

private slots: void on_pushButton_clicked();

void on_pushButton_2_clicked();

void on_pushButton_3_clicked();

private: Ui::MainWindow *ui; QTcpSocket * tcpSocket; };

#endif // MAINWINDOW_H

#include "mainwindow.h" #include "ui_mainwindow.h" #include

MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWindow) { ui->setupUi(this); tcpSocket = nullptr; tcpSocket = new QTcpSocket(this); //创建通信对象

setWindowTitle('socket客户端');

connect(tcpSocket,&QTcpSocket::connected,[=]{
    ui->textEdit->setText(QString('已成功连接上服务器'));

});


connect(tcpSocket,&QTcpSocket::readyRead,[=]{
    QByteArray array = tcpSocket->readAll();

    ui->textEdit->append(array);

});

}

MainWindow::~MainWindow() { delete ui; }

//连接 void MainWindow::on_pushButton_clicked() { if(ui->lineEdit->text().isEmpty() || ui->lineEdit_2->text().isEmpty()){ qDebug() << '错误：端口号或ip地址为空'; return; }

QString str = ui->lineEdit->text();
qint16 port = ui->lineEdit_2->text().toInt();

//通信套接字，通过协议栈触发
tcpSocket->connectToHost(str,port);

}

void MainWindow::on_pushButton_2_clicked() { if(tcpSocket == nullptr){ qDebug() << '错误：通信套接字为空'; return; }

QString str = ui->textEdit->toPlainText();

tcpSocket->write(str.toUtf8().data());
ui->textEdit->clear();

}

void MainWindow::on_pushButton_3_clicked() { if(tcpSocket == nullptr){ return; }

tcpSocket->disconnectFromHost();

tcpSocket->close();

tcpSocket = nullptr;

}