Qt5 QT 5.0 Qudpsocket不会触发WaitForBytesWrite

我绑定了一个udp套接字，正在尝试为特定地址编写udp数据报，因此下面是我的代码：

UDP::UDP(QObject *parent) :
    QObject(parent)
{
    socket = new QUdpSocket(this);
    QObject::connect(socket,SIGNAL(bytesWritten(qint64)),this,SLOT(bytesWritten(qint64)));
    QObject::connect(socket,SIGNAL(readyRead()),this,SLOT(readyRead()));
}
void UDP::connect(int port){

if(socket->state()==QAbstractSocket::BoundState){
    qDebug()<<"already bound try to disconnect";
    socket->close();
}
     if(socket->bind(QHostAddress::Any,port,QAbstractSocket::ShareAddress|QAbstractSocket::Reuse    AddressHint)){
        qDebug()<< "listening";
        emit changeStatus("UDP: escutando("+QString::number(port)+")");
    }else{
        qDebug()<< "error no bind";
        emit changeStatus("UDP: erro no bind("+QString::number(port)+")");
    }
}

void UDP::bytesWritten(qint64 bytes){
    qDebug()<<"bytes written:"<<bytes;
    emit changeStatus("UDP: enviado");
}

void UDP::readyRead(){
    qDebug()<<"ready to read";
    QByteArray datagram;
    QHostAddress sender;
    quint16 senderPort;

    datagram.resize(socket->pendingDatagramSize());
    socket->readDatagram(datagram.data(),datagram.size(),&sender,&senderPort);
    qDebug()<< "datagram received from " << sender.toString();

    emit receivedUDPdata(datagram);

}
bool UDP::write(QString dest,int port, QString buffer, int size){
    char *finalOutput;
    finalOutput = new char[size];
    unsigned int j=0;

    for(unsigned int i=0;i<size;i++){
        if(buffer[i]== '\\'){
            switch (buffer.at(++i).toLatin1()){
            case 'r':
                finalOutput[j++] = '\r';
                break;
            case 'n':
                finalOutput[j++]= '\n';
                break;
            case 't':
                finalOutput[j++]='\t';
                break;
            case '\\':
                finalOutput[j++]='\\';
                break;
            }
        }else{
            finalOutput[j++]= buffer[i].toLatin1();
        }
    }
    socket->writeDatagram(finalOutput,j,QHostAddress(dest),port);
    if(!socket->waitForBytesWritten(2000)){
        qDebug() << "UDP Couldnt write.";
        emit changeStatus("UDP: Não foi possível escrever");
        return false;
    }
    return true;
}

变量dest是QString，但在我调用socket->writeDatagram之后，它会像失败一样进入下面的if，但实际上我收到的字节被写入，并且字节写入信号被发出。那么，它为什么要加入if条款呢

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psi将ip dest测试为127.0.0.1，在调用write之后，socket->errorString打印未知错误

QAbstractSocket:：WaitForBytesWrite用于TCP套接字

有了QUdpSocket，API就被写进了tagram，它至少在Qt级别立即发送，我想操作系统有一个缓冲区。要证明这一点，请参见src/network/socket/qudpsocket.cpp中writeDatagram的实现，它发出bytesWriteTensent

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因此，在WriteTagram之后调用WaitForBytesWrited是没有意义的。

您能分享更多的代码吗？socket->writeDatagram之前是什么？当然！已经发布了，当您运行代码时，难道您没有得到以下信息：QAbstractSocket:：WaitForBytesWrite在未连接状态下是不允许的吗？