運行截圖如下：

代碼如下：

widget.h

#ifndef WIDGET_H #define WIDGET_H #include <QWidget> class QUdpSocket; namespace Ui { class Widget; } class Widget : public QWidget { Q_OBJECT public: explicit Widget(QWidget *parent = 0); ~Widget(); public slots: void dataReceived(); void btnClicked(); void widgetEnable(QString data); void setPortBtnClickd(); void peerLineEditChange(QString data); private: Ui::Widget *ui; QUdpSocket *m_udpSocket; }; #endif // WIDGET_H

widget.cpp

#include "widget.h" #include "ui_widget.h" #include <QMessageBox> #include <QHostAddress> #include <QUdpSocket> Widget::Widget(QWidget *parent) : QWidget(parent), ui(new Ui::Widget) { ui->setupUi(this); ui->inputLineEdit->setEnabled(false); ui->sendPushButton->setEnabled(false); ui->peerLineEdit->setEnabled(false); ui->userLineEdit->setEnabled(false); connect(ui->userLineEdit,SIGNAL(textChanged(QString)),this,SLOT(widge tEnable(QString))); connect(ui->setPortPushButton,SIGNAL(clicked(bool)),this,SLOT(setPort BtnClickd())); connect(ui->peerLineEdit,SIGNAL(textEdited(QString)),this,SLOT(peerLi neEditChange(QString))); } Widget::~Widget() { delete ui; } void Widget::dataReceived(){ while(m_udpSocket->hasPendingDatagrams()){ QByteArray datagram; datagram.resize(m_udpSocket->pendingDatagramSize()); m_udpSocket->readDatagram(datagram.data(),datagram.size()); ui->listWidget->insertItem(0,QString::fromLocal8Bit(datagram.data())) ; qDebug()<<QString::fromLocal8Bit(datagram.data()); } } void Widget::btnClicked() { QString msg=ui->userLineEdit->text()+QString::fromLocal8Bit(" > ")+ui->inputLineEdit->text(); QByteArray datagram=msg.toLocal8Bit(); qDebug()<<"msg:"<<msg<<"msg.size"<<msg.size(); m_udpSocket->writeDatagram(datagram,datagram.size(),QHostAddress::Bro adcast,ui->peerLineEdit->text().toInt()); ui->listWidget->insertItem(0,"我 > "+ui->inputLineEdit->text()); } void Widget::widgetEnable(QString data) { if(!data.isEmpty()){ ui->inputLineEdit->setEnabled(true); ui->sendPushButton->setEnabled(true); } } void Widget::setPortBtnClickd() { m_udpSocket=new QUdpSocket(this); connect(m_udpSocket,SIGNAL(readyRead()),this,SLOT(dataReceived())); if(!m_udpSocket->bind(ui->portLineEdit->text().toInt())){ QMessageBox::information(this,"錯誤","端口綁定失敗"); return; } connect(ui->sendPushButton,SIGNAL(clicked(bool)),this,SLOT(btnClicked ())); ui->peerLineEdit->setEnabled(true); } void Widget::peerLineEditChange(QString data) { if(!data.isEmpty()){ ui->userLineEdit->setEnabled(true); } }

main.cpp

#include "widget.h" #include <QApplication> int main(int argc, char *argv[]) { QApplication a(argc, argv); Widget w; w.show(); return a.exec(); }

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