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#QT（TCP网络编程-服务端）

news 来源：原创 2024/5/19 7:00:16

1.IDE：QTCreator

2.实验：编写一个tcp服务端

QTcpsever

QTcpsocket

3.记录：

(1)先搭建界面

（2）服务端代码

a. pro

QT       += core gui networkgreaterThan(QT_MAJOR_VERSION, 4): QT += widgetsCONFIG += c++17# You can make your code fail to compile if it uses deprecated APIs.
# In order to do so, uncomment the following line.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0SOURCES += \main.cpp \widget.cppHEADERS += \widget.hFORMS += \widget.ui# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target

b. widget.h

#ifndef WIDGET_H
#define WIDGET_H#include <QWidget>
#include <QTcpServer>       //加入头文件
#include <QTcpSocket>
QT_BEGIN_NAMESPACE
namespace Ui {
class Widget;
}
QT_END_NAMESPACEclass Widget : public QWidget
{Q_OBJECTpublic:Widget(QWidget *parent = nullptr);~Widget();QTcpServer *tcpsever;    //定义两个指针对象QTcpSocket *tcpsocket;
private slots:void on_openserver_pb_clicked();void new_conneciton_slot();   //server新的连接处理关联函数void readyRead_slot();       //socket准备读关联函数void on_closeserver_pb_clicked();void on_send_pb_clicked();private:Ui::Widget *ui;
};
#endif // WIDGET_H

c. widget.cpp

#include "widget.h"
#include "ui_widget.h"Widget::Widget(QWidget *parent): QWidget(parent), ui(new Ui::Widget)
{ui->setupUi(this);tcpsever = new QTcpServer(this);    //指针赋值tcpsocket = new QTcpSocket(this);connect(tcpsever,SIGNAL(newConnection()),this,SLOT(new_conneciton_slot()));   //新的连接函数关联
}Widget::~Widget()
{delete ui;
}void Widget::new_conneciton_slot()    //新的连接处理函数
{tcpsocket=tcpsever->nextPendingConnection();connect(tcpsocket,SIGNAL(readyRead()),this,SLOT(readyRead_slot()));    //关联socket准备读函数
}
void Widget::readyRead_slot()        //socket准备读关联函数
{QString receive_buff;     //定义一个接受数组receive_buff=tcpsocket->readAll();    //读取所有接受的内容ui->receive_line->appendPlainText(receive_buff);   //在接收区显示接收到的内容
}void Widget::on_openserver_pb_clicked() //打开服务器按钮按下处理函数
{tcpsever->listen(QHostAddress::Any,ui->com_number->text().toUInt());    //监听主机上的所有端口，将端口号转为无符号整型
}void Widget::on_closeserver_pb_clicked() //关闭服务器按钮按下处理函数
{tcpsever->close();
}void Widget::on_send_pb_clicked()       //当发送按钮按下时处理函数
{tcpsocket->write(ui->send_line->text().toLocal8Bit().data());
}