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1、实现功能
1、服务器和客户端能够建立连接
2、服务器可以给客户端发送信息
3、客户端可以给服务器发送信息
2、server
2-1、widget.h
#ifndef WIDGET_H #define WIDGET_H #include <QWidget> #include <QTcpServer> #include <QTcpSocket> QT_BEGIN_NAMESPACE namespace Ui { class Widget; } QT_END_NAMESPACE class Widget : public QWidget { Q_OBJECT public: Widget(QWidget *parent = nullptr); ~Widget(); public slots: void readData(); private slots: void on_send_btn_clicked(); private: Ui::Widget *ui; QTcpServer *server; QTcpSocket *client; }; #endif // WIDGET_H 2-2、widget.cpp
#include "widget.h" #include "ui_widget.h" Widget::Widget(QWidget *parent) : QWidget(parent) , ui(new Ui::Widget) { ui->setupUi(this); //设置一下窗口标题 this->setWindowTitle("server"); //实例化服务器对象 this->server = new QTcpServer(this); //创建监听队列并邦定ip和port //本地主机ip，端口号为1024~49151 this->server->listen(QHostAddress("192.168.12.47"), 9999); //等待客户端连接，做信号与槽函数关联 connect(this->server, &QTcpServer::newConnection, this, [=]() { this->client = this->server->nextPendingConnection(); //得到了客户端，就可以进行通信 connect(this->client, &QTcpSocket::readyRead, this, &Widget::readData); }); } Widget::~Widget() { delete ui; } //从客户端读数据 void Widget::readData() { //从客户端中读数据 QByteArray data = this->client->readAll(); //读到的数据添加到recv_edit中 this->ui->recv_edit->append(data); } //给客户端写数据 void Widget::on_send_btn_clicked() { //获取到需要发送给客户端的数据 QString data = this->ui->send_edit->text(); //发送给客户端 this->client->write(data.toUtf8()); //清空输入框 this->ui->send_edit->clear(); } 2-3、widget.ui
3、client
3-1、widget.h
#ifndef WIDGET_H #define WIDGET_H #include <QWidget> #include <QTcpSocket> QT_BEGIN_NAMESPACE namespace Ui { class Widget; } QT_END_NAMESPACE class Widget : public QWidget { Q_OBJECT public: Widget(QWidget *parent = nullptr); ~Widget(); private slots: void on_connect_btn_clicked(); void on_send_btn_clicked(); public slots: void readData(); private: Ui::Widget *ui; QTcpSocket *client; int flag; int src_size; QByteArray src_data; }; #endif // WIDGET_H 3-2、widget.cpp
#include "widget.h" #include "ui_widget.h" #include <QHostAddress> #include <QMessageBox> Widget::Widget(QWidget *parent) : QWidget(parent) , ui(new Ui::Widget) { ui->setupUi(this); this->setWindowTitle("client"); this->flag = 0; this->src_size = 0; this->src_data.clear(); //实例化客户端套接字对象 this->client = new QTcpSocket(this); //成功连接与否，信号与槽的关联 connect(this->client, &QTcpSocket::connected, this, [=]() { QMessageBox::information(this, "提示", "成功建立连接"); }); //进行通信，读是被动的，需要做信号与槽关联 connect(this->client, &QTcpSocket::readyRead, this, &Widget::readData); } Widget::~Widget() { delete ui; } //连接服务器 void Widget::on_connect_btn_clicked() { //获取ip和port QString ip = this->ui->ip_edit->text(); uint port = this->ui->port_edit->text().toUInt(); //连接服务器 this->client->connectToHost(QHostAddress(ip), port); } //从客户端读数据 void Widget::readData() { // //从客户端中读数据 // QByteArray data = this->client->readAll(); // //读到的数据添加到recv_edit中 // this->ui->recv_edit->append(data); char buf[256] = {0}; if(this->flag == 0) { this->client->read(buf, 256); //FILE_SIZE#文件大小 QStringList info = QString(buf).split("#"); if(info.front() == "FILE_SIZE") { //获取到图片文件的大小 this->src_size = info.back().toInt(); this->flag = 1; } } else if(this->flag == 1) //开始接收真正的图像数据 { QByteArray data = this->client->readAll(); //保存下来 this->src_data.append(data); if(this->src_data.size() == this->src_size) { //下载成功 QPixmap pix; pix.loadFromData(this->src_data); this->ui->label->setPixmap(pix.scaled(this->ui->label->size())); this->flag = 0; this->src_size = 0; this->src_data.clear(); } } } //给客户端写数据 void Widget::on_send_btn_clicked() { //获取到需要发送给客户端的数据 QString data = this->ui->send_edit->text(); //发送给客户端 this->client->write(data.toUtf8()); //清空输入框 this->ui->send_edit->clear(); } 3-3、widget.ui
