QT中的SOCKET的通信

1、服务端程序

 

//ui_widget.h#ifndef UI_WIDGET_H#define UI_WIDGET_H#include <QtCore/QVariant>#include <QtGui/QAction>#include <QtGui/QApplication>#include <QtGui/QButtonGroup>#include <QtGui/QHeaderView>#include <QtGui/QPushButton>#include <QtGui/QTextEdit>#include <QtGui/QWidget>QT_BEGIN_NAMESPACEclass Ui_Widget{public: QTextEdit *textSend; QPushButton *send; QTextEdit *textReceive; QPushButton *receive; void setupUi(QWidget *Widget) { if (Widget->objectName().isEmpty()) Widget->setObjectName(QString::fromUtf8("Widget")); Widget->resize(626, 286); textSend = new QTextEdit(Widget); textSend->setObjectName(QString::fromUtf8("textSend")); textSend->setGeometry(QRect(10, 10, 281, 191)); send = new QPushButton(Widget); send->setObjectName(QString::fromUtf8("send")); send->setGeometry(QRect(10, 220, 281, 41)); textReceive = new QTextEdit(Widget); textReceive->setObjectName(QString::fromUtf8("textReceive")); textReceive->setGeometry(QRect(320, 10, 281, 191)); receive = new QPushButton(Widget); receive->setObjectName(QString::fromUtf8("receive")); receive->setGeometry(QRect(320, 220, 281, 41)); retranslateUi(Widget); QMetaObject::connectSlotsByName(Widget); } // setupUi void retranslateUi(QWidget *Widget) { Widget->setWindowTitle(QApplication::translate("Widget", "Widget", 0, QApplication::UnicodeUTF8)); send->setText(QApplication::translate("Widget", "/345/217/221/351/200/201", 0, QApplication::UnicodeUTF8)); receive->setText(QApplication::translate("Widget", "/346/216/245/346/224/266", 0, QApplication::UnicodeUTF8)); Q_UNUSED(Widget); } // retranslateUi};namespace Ui { class Widget: public Ui_Widget {};} // namespace UiQT_END_NAMESPACE#endif // UI_WIDGET_H//widget.h#ifndef WIDGET_H#define WIDGET_H#include <QtGui/QWidget>#include <QUdpSocket>namespace Ui{ class Widget;}class Widget : public QWidget{ Q_OBJECTpublic: Widget(QWidget *parent = 0); ~Widget(); int port1; int port2; QHostAddress *hostaddr1; QHostAddress *hostaddr2;private: Ui::Widget *ui; QUdpSocket *udpSocket;private slots: void send(); void receive();};#endif // WIDGET_H//widget.cpp#include "widget.h"#include "ui_widget.h"#include <QMessageBox>Widget::Widget(QWidget *parent) : QWidget(parent), ui(new Ui::Widget){ ui->setupUi(this); port1=4444; port2=4445; hostaddr1 = new QHostAddress("10.10.19.162"); hostaddr2 = new QHostAddress("10.10.19.161"); //创建 QUdpSocket 对象 udpSocket=new QUdpSocket(this); bool conn=udpSocket->bind(*hostaddr2,port2); //服务器端IP为10.10.19.161,端口为4445 //链接失败 if(!conn){ QMessageBox box; box.setText(tr("链接错误")); box.exec(); }else{ //把udpSocket的信号关联到槽 connect(udpSocket,SIGNAL(readyRead()),this,SLOT(receive())); connect(ui->send,SIGNAL(clicked()),this,SLOT(send())); } setWindowTitle(tr("服务器端"));}Widget::~Widget(){ delete ui;}void Widget::send(){ QMessageBox box; QString text=ui->textSend->toPlainText(); if(text.length()==0){ box.setText(tr("请输入发送内容")); } /*开始发送数据*/ //初始化长度 int len=0; //udpSocket->writeDatagram(发送的数据,发送数据的长度,IP,端口); 返回一个长度. len=udpSocket->writeDatagram(text.toLatin1(),text.length(),*hostaddr1,port1); if(len){ box.setText(tr("发送成功")); } box.exec();}void Widget::receive(){ while(udpSocket->hasPendingDatagrams()){ //是否读到数据 QByteArray data; //udpSocket->pendingDatagramSize 获取报文长度 //data.resize 给 data 数组设置长度 data.resize(udpSocket->pendingDatagramSize()); //读入数据 udpSocket->readDatagram(data.data(),data.size()); //显示数据内容 QString str=data.data(); ui->textReceive->insertPlainText(str+"/r/n"); }}//main.cpp#include <QtGui/QApplication>#include <QTextCodec>#include "widget.h"int main(int argc, char *argv[]){ QApplication a(argc, argv); QTextCodec::setCodecForTr(QTextCodec::codecForName("gb2312")); Widget w; w.show(); return a.exec();}

 

2、客户端程序

 

//ui_widget.h#ifndef UI_WIDGET_H#define UI_WIDGET_H#include <QtCore/QVariant>#include <QtGui/QAction>#include <QtGui/QApplication>#include <QtGui/QButtonGroup>#include <QtGui/QHeaderView>#include <QtGui/QPushButton>#include <QtGui/QTextEdit>#include <QtGui/QWidget>QT_BEGIN_NAMESPACEclass Ui_Widget{public: QPushButton *close; QTextEdit *textReceive; QPushButton *send; QTextEdit *textSend; void setupUi(QWidget *Widget) { if (Widget->objectName().isEmpty()) Widget->setObjectName(QString::fromUtf8("Widget")); Widget->resize(604, 275); close = new QPushButton(Widget); close->setObjectName(QString::fromUtf8("close")); close->setGeometry(QRect(20, 20, 251, 41)); textReceive = new QTextEdit(Widget); textReceive->setObjectName(QString::fromUtf8("textReceive")); textReceive->setGeometry(QRect(20, 80, 251, 171)); send = new QPushButton(Widget); send->setObjectName(QString::fromUtf8("send")); send->setGeometry(QRect(320, 20, 251, 41)); textSend = new QTextEdit(Widget); textSend->setObjectName(QString::fromUtf8("textSend")); textSend->setGeometry(QRect(320, 80, 251, 171)); retranslateUi(Widget); QMetaObject::connectSlotsByName(Widget); } // setupUi void retranslateUi(QWidget *Widget) { Widget->setWindowTitle(QApplication::translate("Widget", "Widget", 0, QApplication::UnicodeUTF8)); close->setText(QApplication::translate("Widget", "/345/205/263/351/227/255", 0, QApplication::UnicodeUTF8)); send->setText(QApplication::translate("Widget", "/345/217/221/351/200/201", 0, QApplication::UnicodeUTF8)); Q_UNUSED(Widget); } // retranslateUi};namespace Ui { class Widget: public Ui_Widget {};} // namespace UiQT_END_NAMESPACE#endif // UI_WIDGET_H//widget.h#ifndef WIDGET_H#define WIDGET_H#include <QtGui/QWidget>#include <QUdpSocket>namespace Ui{ class Widget;}class Widget : public QWidget{ Q_OBJECTpublic: Widget(QWidget *parent = 0); ~Widget(); int port1; int port2; QHostAddress *hostaddr1; QHostAddress *hostaddr2;private: Ui::Widget *ui; QUdpSocket *udpSocket;private slots: void send(); void receive();};#endif // WIDGET_H//widget.cpp#include "widget.h"#include "ui_widget.h"#include <QTextCodec>#include <QMessageBox>Widget::Widget(QWidget *parent) : QWidget(parent), ui(new Ui::Widget){ ui->setupUi(this); port1=4444; port2=4445; hostaddr1 = new QHostAddress("10.10.19.162"); hostaddr2 = new QHostAddress("10.10.19.161"); setWindowTitle(tr("接收端")); //实例化QUdpSocket 对象... udpSocket=new QUdpSocket(this); //监听端口 bool conn=udpSocket->bind(*hostaddr1,port1); //客户端的IP为10.10.19.162,端口号为4444。 //链接失败 if(!conn){ QMessageBox box; box.setText(tr("链接错误")); box.exec(); }else{ //把udpSocket的信号关联到槽 connect(udpSocket,SIGNAL(readyRead()),this,SLOT(receive())); connect(ui->send,SIGNAL(clicked()),this,SLOT(send())); } connect(ui->close,SIGNAL(clicked()),this,SLOT(close()));}Widget::~Widget(){ delete ui;}void Widget::send(){ QMessageBox box; QString text=ui->textSend->toPlainText(); if(text.length()==0){ box.setText(tr("请输入发送内容")); } /*开始发送数据*/ //初始化长度 int len=0; //udpSocket->writeDatagram(发送的数据,发送数据的长度,IP,端口); 返回一个长度. len=udpSocket->writeDatagram(text.toLatin1(),text.length(),*hostaddr2,port2); //发送的字符发送到IP为10.10.19.161和端口为4445的服务端 if(len){ box.setText(tr("发送成功")); } box.exec();}void Widget::receive(){ while(udpSocket->hasPendingDatagrams()){ //是否读到数据 QByteArray data; //udpSocket->pendingDatagramSize 获取报文长度 //data.resize 给 data 数组设置长度 data.resize(udpSocket->pendingDatagramSize()); //读入数据 udpSocket->readDatagram(data.data(),data.size()); //显示数据内容 QString str=data.data(); ui->textReceive->insertPlainText(str+"/r/n"); }}//main.cpp#include <QtGui/QApplication>#include <QTextCodec>#include "widget.h"int main(int argc, char *argv[]){ QApplication a(argc, argv); QTextCodec::setCodecForTr(QTextCodec::codecForLocale()); Widget w; w.show(); return a.exec();}

 

 

3、运行程序如下。

客户端发送receive字符时服务器接收框中显示receive。服务端发送service时，客户端接收框中显示service

 

 

 

 

 

 4、说明

本程序实际实现的是TCP协议，因为双方都绑定了自己的IP和端口，只有同时识别IP和端口号才能正确的发送和接收数据。

不过，也可以更改为UDP协议或直接用广播的形式。

这个程序只是个简单的实例，但可以通过这个小的实例，将其嵌入到大型的程序里面，以实现复杂的SOCKET通信。