QT 的UDP SOCKET编程

来源：互联网发布：亚当斯密知乎编辑：程序博客网时间：2024/06/06 18:33

QT建立控制台项目,还是用最简单的c/s 模式.

client端:

UDPclient.h

#ifndef UDP_UDPclient_H
#define UDP_UDPclient_H

#include <QtNetwork/QUdpSocket>
#include <QHostAddress>
#include <QThread>

#pragma once

class UDPclient: public QObject
{
Q_OBJECT
public:
void InitSocket();
private slots:
void Recv();
};
#endif

UDPclient.cpp

#include "UDPclient.h"

QUdpSocket *udpSocket;   //套接字对象
void UDPclient::InitSocket()
{
udpSocket = new QUdpSocket(this);
udpSocket->bind(QHostAddress::Any,2002);
connect(udpSocket, SIGNAL(readyRead()),
   this, SLOT(Recv()));
}
void UDPclient::Recv()
{
  while (udpSocket->hasPendingDatagrams())
{
        QByteArray datagram;
        datagram.resize(udpSocket->pendingDatagramSize());
        udpSocket->readDatagram(datagram.data(), datagram.size());
  for (int i = 0; i < datagram.size(); ++i)
  {
   printf( " %x",datagram.at(i));
  }
  printf("/n");
    }
}

函数解释:pendingDatagramSize 当有数据包读入时返回true.

resize 为datageam设置大小

pendingDatagramSize 返回udosocket第一个数据包的大小

readDatagram 读数据包

server端,顺便学习写下个多进程QThread:

main.cpp

#include <QtGui/QApplication>
#include "UDP_QT.h"

int main(int argc, char *argv[])
{
UDP_QT Server;
QCoreApplication a(argc, argv);
Server.InitSocket();
Server.start();//进程开始
return a.exec();
}

UDP_QT.h

#ifndef UDP_QT_H
#define UDP_QT_H

#include <QtNetwork/QUdpSocket>
#include <QHostAddress>
#include <QThread>

#pragma once

class UDP_QT: public QThread
{

private:
void Send();

public:
void InitSocket();
void run();
};
#endif

UDP_QT.cpp

#include "UDP_QT.h"
QUdpSocket *udpSocket; //套接字对象

char ToAddress[20]="10.144.123.237";

void UDP_QT::InitSocket()
{
udpSocket = new QUdpSocket(this);
}
void UDP_QT::Send()
{
char information[]="adg";

while(1)
{
  udpSocket->writeDatagram(information,QHostAddress(ToAddress),2002);
     printf("send datagram:");
   for (int i = 0; i < sizeof(information); ++i)
  {
   printf("%d",information[i]);
  }
  static int count=0;
  printf("/n%d",count++);
   sleep(1); //sleep函数要在进程下才能使用,它继承QThread
}
}
void UDP_QT::run() //运行进程
{
Send();
}

以上仿照QT帮助写的.