QT -----TCP网络编程
1.主要流程
1.客户端
创建QTcpSocket对象
连接到服务器 --connectToHost()
发送数据 ---write()
读取数据 ---readAll()
断开连接
2.服务器
创建QTcpServer 对象
绑定本地信息---listen(QHostAddress::Any，端口)
等待客户端连接---newConnection()
读取数据
发送数据
断开连接
2.头文件
客户端：#include < QTcpSocket >
服务器：#include < QTcpServer >
必须要在pro文件加上-----QT += core gui network
3.代码
1.客户端
-
widget.h
#ifndef WIDGET_H
#define WIDGET_H
#include <QWidget>
#include <QtNetwork/QTcpSocket>
#include <QKeyEvent>
namespace Ui {
class Widget;
}
class Widget : public QWidget
{
Q_OBJECT
private:
QTcpSocket *client;
QString *message;
void keyPressEvent(QKeyEvent *event);
public:
explicit Widget(QWidget *parent = nullptr);
~Widget();
private:
Ui::Widget *ui;
};
#endif // WIDGET_H
-
widget.cpp
#include "widget.h"
#include "ui_widget.h"
#include <QTextEdit>
Widget::Widget(QWidget *parent) :
QWidget(parent),
ui(new Ui::Widget)
{
ui->setupUi(this);
client = new QTcpSocket(this);
ui->Button_send->setEnabled(false);
/* 连接服务器 */
connect(ui->Button_connection,&QPushButton::released,this,
[=]()
{
client->connectToHost(ui->lineEdit_ip->text(),ui->lineEdit_d->text().toInt());
});
/* 连接成功 */
connect(client,&QTcpSocket::connected,this,
[&]()
{
ui->Button_send->setEnabled(true);
ui->label_prompt->setText("已连接");
ui->textEdit_receive->append("连接成功……");
});
/* 发送到服务器 */
connect(ui->Button_send,&QPushButton::released,this,
[&]()
{
QString data = ui->textEdit_edit->toPlainText();
if(data.length() > ) //如果输入框不为空才可以发送
{
client->write(data.toUtf8());
QString data1 = "已发送："+data;
ui->textEdit_receive->append(data1);
}
else {
ui->textEdit_receive->append("输入信息");
}
});
/* 接收信息 */
connect(client,&QTcpSocket::readyRead,this,
[&]()
{
QString msg = "收到：" + client->readAll();
ui->textEdit_receive->append(msg);
});
/* 断开连接 */
connect(ui->Button_disconnect,&QPushButton::released,this,
[=]()
{
client->disconnectFromHost();
ui->Button_send->setEnabled(false);
});
/* 断开连接 */
connect(client,&QTcpSocket::disconnected,this,
[&]()
{
ui->label_prompt->setText("未连接……");
ui->textEdit_receive->append("断开连接……");
});
}
/* 键盘事件：捕获按下回车键发送---这一部分可选择不要 */
void Widget::keyPressEvent(QKeyEvent *event)
{
int key = event->key();
if(key == Qt::Key_Enter)
{
QString data = ui->textEdit_edit->toPlainText();
if(data.length() > )
{
client->write(data.toUtf8());
QString data1 = "已发送："+data;
ui->textEdit_receive->append(data1);
}
else {
ui->textEdit_receive->append("输入信息");
}
}
}
Widget::~Widget()
{
delete ui;
}
2.服务器
-
widget.h
#ifndef WIDGET_H
#define WIDGET_H
#include <QWidget>
#include <QtNetwork/QTcpServer>
#include <QtNetwork/QTcpSocket>
#include <QKeyEvent>
namespace Ui {
class Widget;
}
class Widget : public QWidget
{
Q_OBJECT
public:
QTcpServer *server;
QTcpSocket *socket;
void new_client();
void send_data();
void read_data();
void disconnect();
void keyPressEvent(QKeyEvent *event); //重写键盘事件虚函数，如果不要键盘发 //送可选择删掉
public:
explicit Widget(QWidget *parent = nullptr);
~Widget();
private:
Ui::Widget *ui;
};
#endif // WIDGET_H
-
widget.cpp
#include "widget.h"
#include "ui_widget.h"
#include <QDebug>
Widget::Widget(QWidget *parent) :
QWidget(parent),
ui(new Ui::Widget)
{
ui->setupUi(this);
ui->Button_send->setEnabled(false);
server = new QTcpServer(this);
/* 绑定绑定信息 */
server->listen(QHostAddress::Any,ui->lineEdit_d->text().toInt());
/* 等待客户端连接 */
connect(server,&QTcpServer::newConnection,this,&Widget::new_client);
/* 发送信息 */
connect(ui->Button_send,&QPushButton::released,this,&Widget::send_data);
}
/* 等待连接 */
void Widget::new_client()
{
qDebug() << "新客户连接";
ui->label_prompt->setText("已连接");
ui->textEdit_log->append("连接成功");
ui->Button_send->setEnabled(true);
socket = server->nextPendingConnection();
connect(socket,&QTcpSocket::readyRead,this,&Widget::read_data);
connect(ui->Button_disconnect,&QPushButton::released,socket,&QTcpSocket::disconnectFromHost);
connect(socket,&QTcpSocket::disconnected,this,
[&]()
{
ui->textEdit_log->append("断开连接");
});
}
/* 发送信息 */
void Widget::send_data()
{
QString data = ui->textEdit_edit->toPlainText();
if(data.length() > ) //如果输入栏不为空才可以发送
{
socket->write(data.toUtf8());
QString data1 = "已发送：" + data;
ui->textEdit_log->append(data1);
}
else {
ui->textEdit_log->append("输入信息");
}
}
/* 接收信息 */
void Widget::read_data()
{
// QTcpSocket *obj = (QTcpSocket*)sender();
QString msg = "收到：" + socket->readAll();
ui->textEdit_log->append(msg);
}
/* 断开连接 */
void Widget::disconnect()
{
ui->textEdit_log->append("断开连接");
ui->Button_send->setEnabled(false);
}
/* 回车键发送 ----- 可选择不要 */
void Widget::keyPressEvent(QKeyEvent *event)
{
int key = event->key();
if(key == Qt::Key_Enter)
{
QString data = ui->textEdit_edit->toPlainText();
if(data.length() > ) //如果输入栏不为空才可以发送
{
qDebug() << data.length();
socket->write(data.toUtf8());
QString data1 = "已发送：" + data;
ui->textEdit_log->append(data1);
}
else {
ui->textEdit_log->append("输入信息");
}
}
}
Widget::~Widget()
{
delete ui;
}
4.布局
- 客户端
- 服务器