Qt之上位机开发实战（二）_qt上位机开发csdn

Qt的网络编程

网络编程包括TCP和UDP TCP的编程需要用到两个类：QTcpServer和QTcpSocket 本节将完成一个TCP服务器和一个客户端 首先我们需要完成布局

在pro文件下添加QT += core gui network，.h文件下包含头文件#include <QTcpServer>，#include <QTcpSocket>，并且创建对象

  QTcpServer *tcpServer;
    QTcpSocket *tcpSocket;
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添加监听端口号

tcpServer = new QTcpServer(this);
tcpSocket = new QTcpSocket(this);

tcpServer->listen(QHostAddress::Any,ui->NumEdit->text().toUInt());
connect(tcpServer,SIGNAL(newConnection()),this,SLOT(newConnection_Slot()));
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接收信息定义

void TCPServer::readyRead_Slot()
{
    QString buf;
    buf = tcpSocket->readAll();
    ui->ReceveEdit->appendPlainText(buf);
}
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按钮定义

void TCPServer::on_Open_clicked()
{
    tcpServer->listen(QHostAddress::Any,ui->NumEdit->text().toUInt());
}


void TCPServer::on_Close_clicked()
{
    tcpServer->close();
}


void TCPServer::on_Close_2_clicked()
{
    tcpSocket->write(ui->SendEdit->text().toLocal8Bit().data());
}
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客户端布局

.h文件中添加头文件#include <QTcpSocket>，对象 QTcpSocket *tcpSocekt;

添加槽函数

private slots:
    void on_OpenBT_clicked();
    void connected_Slot();
    void readyRead_Slot();
    void on_CloseBT_clicked();
    void on_SendBT_clicked();
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.cpp文件中添加功能

void Widget::on_OpenBT_clicked()
{
    tcpSocekt->connectToHost(ui->IPEdit->text(),ui->NumEdit->text().toUInt());
    connect(tcpSocekt,SIGNAL(connected()),this,SLOT());
}

void Widget::connected_Slot()
{
    connect(tcpSocekt,SIGNAL(connected(readyRead())),this,SLOT());
}
void Widget::readyRead_Slot()
{
    ui->ReceEdit->appendPlainText(tcpSocekt->readAll());
}
void Widget::on_CloseBT_clicked()
{
    tcpSocekt->close();
}


void Widget::on_SendBT_clicked()
{
    tcpSocekt->write(ui->SendEdit->text().toLocal8Bit());
}
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