Qt TCP Socket编程：打造简易客户端

#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 * tcpSoket; };

#endif // MAINWINDOW_H

#include 'mainwindow.h' #include 'ui_mainwindow.h' #include

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

setWindowTitle('socket客户端');

connect(tcpSoket,&QTcpSocket::connected,[=]{
    ui->textEdit->setText(QString('连接成功'));

});


connect(tcpSoket,&QTcpSocket::readyRead,[=]{
    QByteArray array = tcpSoket->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() << 'IP/Port不能为空'; 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
tcpSoket->connectToHost(str,port);

}

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

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

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

}

void MainWindow::on_pushButton_3_clicked() { if(tcpSoket == nullptr){ qDebug() << '断开套接字为空'; return; }

tcpSoket->disconnectFromHost();

tcpSoket->close();

tcpSoket = nullptr;

}