Qt TCP Socket 连接服务器示例 - 代码解析

#ifndef MAINWINDOW_H #define MAINWINDOW_H

#include #include

QT_BEGIN_NAMESPACE namespace Ui { class MainWindow; } QT_END_NAMESPACE

class MainWindow : public QMainWindow { Q_OBJECT

public: MainWindow(QWidget *parent = nullptr); ~MainWindow();

private slots: void on_pushButton_clicked(); void connected(); void disconnected(); void readyRead();

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

#endif // MAINWINDOW_H

.cpp文件：mainwindow.cpp

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

MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent) , ui(new Ui::MainWindow) { ui->setupUi(this); socket = new QTcpSocket(this);

connect(socket, &QTcpSocket::connected, this, &MainWindow::connected);
connect(socket, &QTcpSocket::disconnected, this, &MainWindow::disconnected);
connect(socket, &QTcpSocket::readyRead, this, &MainWindow::readyRead);

}

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

void MainWindow::on_pushButton_clicked() { ui->textEdit->clear(); ui->textEdit->append('正在连接中...');

socket->connectToHost('服务器IP地址', 1234); // 替换为实际的服务器IP地址和端口号

}

void MainWindow::connected() { ui->textEdit->append('连接成功！');

// 向服务器发送userid
QString userid = '123'; // 替换为实际的userid
socket->write(userid.toUtf8());

}

void MainWindow::disconnected() { ui->textEdit->append('连接失败！'); }

void MainWindow::readyRead() { QString suggestion = QString(socket->readAll()); ui->textEdit->append(suggestion); }