#QT（TCP网络编程-客户端）

1.IDE：QTCreator

2.实验

3.记录

（1）做一个客���端UI界面（注意改标签名字，后面方便关联函数）

（2）编写客户端代码，代码编写完成之后，测试

a.cmd打开命令行

b.键入ipconfig，常看IPV4地址，然后同时打开客户端和服务端，将IPV4地址输入给客户端，然后端口选择一样即可，如果不行可以换其他端口试试

c.运行效果

4.代码

pro文件

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/$${TARGET}/binelse: unix:!android: target.path = /opt/$${TARGET}/bin!isEmpty(target.path): INSTALLS += target

widget.h

#ifndef WIDGET_H#define WIDGET_H#include #include QT_BEGIN_NAMESPACEnamespace Ui {class Widget;}QT_END_NAMESPACEclass Widget : public QWidget{    Q_OBJECTpublic:    Widget(QWidget *parent = nullptr);    ~Widget();    QTcpSocket *tcpsocket;  //创建一个指针对象private slots:    void on_openclient_pb_clicked();    void connected_slot();  //连接成功关联处理函数    void readyRead_slot();  //准备读关联处理函数    void on_closeclient_pb_clicked();    void on_send_pb_clicked();private:    Ui::Widget *ui;};#endif // WIDGET_H

widget.cpp

#include "widget.h"#include "ui_widget.h"Widget::Widget(QWidget *parent)    : QWidget(parent)    , ui(new Ui::Widget){    ui->setupUi(this);    tcpsocket=new QTcpSocket(this);}Widget::~Widget(){    delete ui;}void Widget::on_openclient_pb_clicked()    //打开客户端按钮点击时处理函数{    tcpsocket->connectToHost(ui->ip_line->text(),ui->port_line->text().toUInt());   //连接指定ip地址的指定端口    connect(tcpsocket,SIGNAL(connected()),this,SLOT(connected_slot()));   //关联连接成功处理函数}void Widget::connected_slot(){    connect(tcpsocket,SIGNAL(readyRead()),this,SLOT(readyRead_slot()));}void Widget::readyRead_slot(){    ui->receive_line->appendPlainText(tcpsocket->readAll());     //在接收区显示所有接收到的数据}void Widget::on_closeclient_pb_clicked()    //关闭客户端按钮按下处理函数{    tcpsocket->close();}void Widget::on_send_pb_clicked()     //发送按钮按下时处理函数{    tcpsocket->write(ui->send_line->text().toLocal8Bit().data());}