05_QT网络编程之TCP通信
QT网络编程之TCP通信
QT的网络编程:
网络编程有TCP和UDP。
TCP编程需要用到俩个类:QTcpServer和QTcpSocket
本节课目标:
完成一个TCP服务器和一个客户端。
TcpServer
widget.ui
<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
<class>Widget</class>
<widget class="QWidget" name="Widget">
<property name="geometry">
<rect>
<x>0</x>
<y>0</y>
<width>510</width>
<height>480</height>
</rect>
</property>
<property name="windowTitle">
<string>Widget</string>
</property>
<layout class="QGridLayout" name="gridLayout">
<item row="0" column="0">
<layout class="QVBoxLayout" name="verticalLayout">
<item>
<widget class="QGroupBox" name="groupBox">
<property name="title">
<string>接收窗口</string>
</property>
</widget>
</item>
<item>
<widget class="QPlainTextEdit" name="receiveEdit">
<property name="readOnly">
<bool>true</bool>
</property>
</widget>
</item>
<item>
<layout class="QHBoxLayout" name="horizontalLayout_2">
<item>
<widget class="QLabel" name="label">
<property name="text">
<string>端口号:</string>
</property>
</widget>
</item>
<item>
<widget class="QLineEdit" name="portEdit"/>
</item>
<item>
<spacer name="horizontalSpacer_3">
<property name="orientation">
<enum>Qt::Horizontal</enum>
</property>
<property name="sizeHint" stdset="0">
<size>
<width>40</width>
<height>20</height>
</size>
</property>
</spacer>
</item>
</layout>
</item>
<item>
<widget class="QGroupBox" name="groupBox_2">
<property name="title">
<string>发送窗口</string>
</property>
</widget>
</item>
<item>
<widget class="QLineEdit" name="sendEdit"/>
</item>
<item>
<layout class="QHBoxLayout" name="horizontalLayout">
<item>
<widget class="QPushButton" name="openBt">
<property name="text">
<string>打开服务器</string>
</property>
</widget>
</item>
<item>
<spacer name="horizontalSpacer">
<property name="orientation">
<enum>Qt::Horizontal</enum>
</property>
<property name="sizeHint" stdset="0">
<size>
<width>40</width>
<height>20</height>
</size>
</property>
</spacer>
</item>
<item>
<widget class="QPushButton" name="closeBt">
<property name="text">
<string>关闭服务器</string>
</property>
</widget>
</item>
<item>
<spacer name="horizontalSpacer_2">
<property name="orientation">
<enum>Qt::Horizontal</enum>
</property>
<property name="sizeHint" stdset="0">
<size>
<width>40</width>
<height>20</height>
</size>
</property>
</spacer>
</item>
<item>
<widget class="QPushButton" name="sendBt">
<property name="text">
<string>发送数据</string>
</property>
</widget>
</item>
</layout>
</item>
</layout>
</item>
</layout>
</widget>
<layoutdefault spacing="6" margin="11"/>
<resources/>
<connections/>
</ui>
TcpServer.pro
#-------------------------------------------------
#
# Project created by QtCreator 2024-04-13T15:38:03
#
#-------------------------------------------------
QT += core gui network
greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
TARGET = TcpServer
TEMPLATE = app
# The following define makes your compiler emit warnings if you use
# any feature of Qt which has been marked as deprecated (the exact warnings
# depend on your compiler). Please consult the documentation of the
# deprecated API in order to know how to port your code away from it.
DEFINES += QT_DEPRECATED_WARNINGS
# You can also make your code fail to compile if you use deprecated APIs.
# In order to do so, uncomment the following line.
# You can also select to disable deprecated APIs only up to a certain version of Qt.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000 # disables all the APIs deprecated before Qt 6.0.0
SOURCES += \
main.cpp \
widget.cpp
HEADERS += \
widget.h
FORMS += \
widget.ui
widget.h
#ifndef WIDGET_H
#define WIDGET_H
#include <QWidget>
#include <QTcpServer>
#include <QTcpSocket>
#include <QString>
namespace Ui {
class Widget;
}
class Widget : public QWidget
{
Q_OBJECT
public:
explicit Widget(QWidget *parent = 0);
~Widget();
QTcpServer *tcpServer;
QTcpSocket *tcpSocket;
private slots:
void on_openBt_clicked();
void on_closeBt_clicked();
void on_sendBt_clicked();
void newConnection_slot();
void readyRead_slot();
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);
tcpServer = new QTcpServer(this);
tcpSocket = new QTcpSocket(this);
connect(tcpServer,SIGNAL(newConnection()),this,SLOT(newConnection_slot()));
}
void Widget::newConnection_slot()
{
tcpSocket = tcpServer->nextPendingConnection();
connect(tcpSocket,SIGNAL(readyRead()),this,SLOT(readyRead_slot()));
}
void Widget:: readyRead_slot()
{
QString buf;
buf = tcpSocket->readAll();
ui->receiveEdit->appendPlainText(buf);
}
Widget::~Widget()
{
delete ui;
}
void Widget::on_openBt_clicked()
{
tcpServer->listen(QHostAddress::Any,ui->portEdit->text().toUInt());
}
void Widget::on_closeBt_clicked()
{
tcpServer->close();
}
void Widget::on_sendBt_clicked()
{
tcpSocket->write(ui->sendEdit->text().toLocal8Bit().data());
}
TcpClient
widget.ui
<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
<class>Widget</class>
<widget class="QWidget" name="Widget">
<property name="geometry">
<rect>
<x>0</x>
<y>0</y>
<width>484</width>
<height>496</height>
</rect>
</property>
<property name="windowTitle">
<string>Widget</string>
</property>
<layout class="QGridLayout" name="gridLayout">
<item row="0" column="0">
<layout class="QVBoxLayout" name="verticalLayout">
<item>
<widget class="QGroupBox" name="groupBox">
<property name="title">
<string>接收框</string>
</property>
</widget>
</item>
<item>
<widget class="QPlainTextEdit" name="receiveEdit">
<property name="readOnly">
<bool>true</bool>
</property>
</widget>
</item>
<item>
<layout class="QHBoxLayout" name="horizontalLayout_2">
<item>
<widget class="QLabel" name="label">
<property name="text">
<string>端口号:</string>
</property>
</widget>
</item>
<item>
<widget class="QLineEdit" name="portEdit"/>
</item>
<item>
<widget class="QLabel" name="label_2">
<property name="text">
<string>ip:</string>
</property>
</widget>
</item>
<item>
<widget class="QLineEdit" name="ipEdit"/>
</item>
</layout>
</item>
<item>
<widget class="QGroupBox" name="groupBox_2">
<property name="title">
<string>发送框</string>
</property>
</widget>
</item>
<item>
<widget class="QLineEdit" name="sendEdit"/>
</item>
<item>
<layout class="QHBoxLayout" name="horizontalLayout">
<item>
<widget class="QPushButton" name="openBt">
<property name="text">
<string>打开客户端</string>
</property>
</widget>
</item>
<item>
<spacer name="horizontalSpacer">
<property name="orientation">
<enum>Qt::Horizontal</enum>
</property>
<property name="sizeHint" stdset="0">
<size>
<width>40</width>
<height>20</height>
</size>
</property>
</spacer>
</item>
<item>
<widget class="QPushButton" name="closeBt">
<property name="text">
<string>关闭客户端</string>
</property>
</widget>
</item>
<item>
<spacer name="horizontalSpacer_2">
<property name="orientation">
<enum>Qt::Horizontal</enum>
</property>
<property name="sizeHint" stdset="0">
<size>
<width>40</width>
<height>20</height>
</size>
</property>
</spacer>
</item>
<item>
<widget class="QPushButton" name="pushButton_3">
<property name="text">
<string>发送数据</string>
</property>
</widget>
</item>
</layout>
</item>
</layout>
</item>
</layout>
</widget>
<layoutdefault spacing="6" margin="11"/>
<resources/>
<connections/>
</ui>
TcpClient.pro
#-------------------------------------------------
#
# Project created by QtCreator 2024-04-13T16:10:28
#
#-------------------------------------------------
QT += core gui network
greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
TARGET = TcpClient
TEMPLATE = app
# The following define makes your compiler emit warnings if you use
# any feature of Qt which has been marked as deprecated (the exact warnings
# depend on your compiler). Please consult the documentation of the
# deprecated API in order to know how to port your code away from it.
DEFINES += QT_DEPRECATED_WARNINGS
# You can also make your code fail to compile if you use deprecated APIs.
# In order to do so, uncomment the following line.
# You can also select to disable deprecated APIs only up to a certain version of Qt.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000 # disables all the APIs deprecated before Qt 6.0.0
SOURCES += \
main.cpp \
widget.cpp
HEADERS += \
widget.h
FORMS += \
widget.ui
widget.h
#ifndef WIDGET_H
#define WIDGET_H
#include <QWidget>
#include <QTcpSocket>
namespace Ui {
class Widget;
}
class Widget : public QWidget
{
Q_OBJECT
public:
explicit Widget(QWidget *parent = 0);
~Widget();
QTcpSocket *tcpSocket;
private slots:
void on_openBt_clicked();
void on_closeBt_clicked();
void on_pushButton_3_clicked();
void connected_slot();
void readyRead_slot();
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_openBt_clicked()
{
tcpSocket->connectToHost(ui->ipEdit->text(), ui->portEdit->text().toUInt());
connect(tcpSocket, SIGNAL(connected()), this, SLOT(connected_slot()));
}
void Widget::connected_slot()
{
connect(tcpSocket, SIGNAL(readyRead()), this, SLOT(readyRead_slot()));
}
void Widget::readyRead_slot()
{
ui->receiveEdit->appendPlainText(tcpSocket->readAll());
}
void Widget::on_closeBt_clicked()
{
tcpSocket->close();
}
void Widget::on_pushButton_3_clicked()
{
tcpSocket->write(ui->sendEdit->text().toLocal8Bit().data());
}