UDP编程

udp相对于tcp来说相对简单，udp不分客户端和服务器，只需要使用一个QUdpSocket类，首先完成布局

Pro文件下加QT += core gui network，.h文件下加#include <QUdpSocket>
.h文件public下创建对象 QUdpSocket *udpSocket; cpp文件下udpSocket = new QUdpSocket(this);，
定义槽函数，.h文件下

private slots:void on_OpenBT_clicked();void readyRead_slot();void on_SendBT_clicked();

cpp文件下

void Widget::readyRead_slot()
{while(udpSocket->hasPendingDatagrams()){QByteArray array;array.resize(udpSocket->pendingDatagramSize());udpSocket->readDatagram(array.data(),array.size());QString buf;buf = array.data();ui->RecrEdit->appendPlainText(buf);}
}

打开按钮功能实现

void Widget::on_OpenBT_clicked()
{if(udpSocket->bind(ui->LocalIP->text().toUInt()) == true){QMessageBox::information(this,"提示","成功");}else{QMessageBox::information(this,"提示","失败");}connect(udpSocket,SIGNAL(raedyRead()),this,SLOT(readyRead_slot()));
}

发送按钮功能实现

void Widget::on_SendBT_clicked()
{quint16 port;QString sendbuff;QHostAddress address;address.setAddress(ui->ObjectIP->text());sendbuff = ui->SendEdit->text();port = ui->ObjectEdit->text().toUInt();udpSocket->writeDatagram(sendbuff.toLocal8Bit().data(),sendbuff.length(),address,port);
}

最后可以下载网络连接助手进行测试。