QT的UDP通信编程实例

本文参考了http://blog.csdn.net/intint/article/details/4527265写的代码，非常感谢博主的奉献。

main1.cpp

#include <QApplication>
#include "udp1.h"

int main(int argc,char **argv)
{
    QApplication app(argc,argv);
    Dialog dlg;
    dlg.show();
    return app.exec();
}

udp1.h

#ifndef _UDP1_H_
#define _UDP1_H_

#include <QDialog.h>
#include <QTextEdit>
#include <QPushButton>
#include <UdpSocket>
#include <QGridLayout>

class Dialog :public QDialog
{
 Q_OBJECT

 public :
  Dialog();
 private:
   QTextEdit *textEdit;
   QPushButton *sendButton;
   QPushButton *exitButton;
   QUdpSocket *udpSocket;
   QGridLayout *layout;
 public slots:
   void send_slot();
   void recv_slot();
};
#endif

udp1.cpp

#include "udp1.h"
#include <QtDebug>

Dialog::Dialog()
{
 sendButton = new QPushButton("send");
 exitButton = new QPushButton("exit");

 textEdit = new QTextEdit();
 layout = new QGridLayout;

 layout -> addWidget(textEdit,0,0,4,6);
 layout -> addWidget(sendButton,5,0,1,2);
 layout -> addWidget(exitButton,5,4,1,2);
 setLayout(layout);

 udpSocket = new QUdpSocket;
 udpSocket -> bind(QHostAddress::LocalHost,9000);

 connect(sendButton,SIGNAL(clicked()),this,SLOT(send_slot()));
 connect(exitButton,SIGNAL(clicked()),this,SLOT(close()))
 connect(udpSocket,SIGNAL(readyRead()),this,SLOT(recv_slot()));
}

void Dialog::send_slot()
{
 qDebug()<<"in send_slot";
 QString str = textEdit -> toPlainText();
 udpSocket -> writeDatagram(qPrintable(str),4096,QHostAddress::LocalHost,8000);
}

void Dialog::recv_slot()
{
 qDebug()<<"in recv_slot()";
 char buffer[4096];
 udpSocker -> readDatagram(buffer,4096,0,0);
 QString str(buffer);
 textEdit -> setText(str);
}

main2.cpp

#include <QApplication>
#include "udp2.h"

int main(int argc,char **argv)
{
 QApplication app(argv,argv);
 Dialog dlg;
 dlg.show();
 return app.exec();
}

udp2.h

#ifndef _UDP_H_
#define _UDP_H_

#include <QDialog>
#include <QPushButton>
#include <QTextEdit>
#include <QUdpSocket>
#inlcude <QGridLayout>

class Dialog:public QDialog
{
 Q_OBJECT
 public:
  Dialog();
 private:
  QPushButton *sendButton;
  QPushButton *exitButton;
  QTextEdit *textEdit;
  QUdpSocket *udpSocket;
  QGridLayout *layout;
 public slots:
  void send_slot();
  void recv_slot();

};
#endif

udp.cpp

#include "udp2.h"
#include <QtDebug>
Dialog::Dialog()
{
 sendButton = new QPushButton("send");
 exitButton = new QPushButton("exit");

 textEdit = new QTextEdit();

 layout =  new QGridLayout;

 layout -> addWidget(textEdit,0,0,4,6);
 layout -> addWidget(sendButton,5,0,1,2);
 layout -> addWidget(exitButton,5,4,1,2);
 setLayout(layout);

 udpSocket = new QUdpSocket;
 udpSocket -> bind(QHostAddress::LocalHost,8000);

  connect(sendButton,SIGNAL(clicked()),this,SLOT(send_slot()));
  connect(exitButton,SIGNAL(clicked()),this,SLOT(close()));
  connect(udpSocket,SIGNAL(readyRead()),this,SLOT(recv_slot()));
}

void Dialog::send_slot()
{ 
 qDebug()<<"in send_slot";
 QString str = textEdit -> toPlainText();
 udpSocket -> writeDatagram(qPrintable(str),4096,QHostAddress::LocalHost, 9000);
 // udpSocket -> writeDatagram(qPrintable(textEdit -> toPlainText()), 256, QHostAddress::LocalHost, 9000);
}

void Dialog::recv_slot()
{
 qDebug()<<"in recv_slot";
 char buffer[4096];
 udpSocket ->readDatagram(buffer,4096,0,0);
 QString str(buffer);
 textEdit -> setText(str);
}

再次感谢源代码的博主，希望能够帮助更多程序员！！