Tip:
用printf打印QString方法如下:
QString output
printf("%s\n",output.toStdString().data());
正文:Qt自動獲取對方ip和端口號
QHostAddress targetaddr;//ip
quint16 targetport;//端口號
while (clientudp->hasPendingDatagrams())
{
QByteArray data;
data.resize(clientudp->pendingDatagramSize());
clientudp->readDatagram(data.data(), data.size(),&targetaddr,&targetport);
qDebug<< targetaddr.toString()<< targetaddr;//也可用別的方式打印
}
windows查看端口號被佔用命令:netstat -aon|findstr "5000"