关于modbus tcp通讯 QModbusReply 内存累计增加的问题

请教论坛大神,这是怎么回事, 我每隔100ms连续不断的往plc存储器里写值，都能够写入，但是内存会不断的累计增加，知道最后程序奔溃...
可能是QModbusReply没完全释放掉。

void CModbusTcpClientWorker::onWriteCoils(int iStartAddr, quint16 uValue, int iServerId)
{

QModbusDataUnit writeUnit(QModbusDataUnit::Coils, iStartAddr, 1);
    writeUnit.setValue(0, uValue);

    bool bWriteResult = false;
    QEventLoop loop;
    QModbusReply* pReply = m_pModbusDevice->sendWriteRequest(writeUnit, iServerId);
    if (NULL != pReply)
    {
        QMetaObject::Connection con = connect(pReply, &QModbusReply::finished, this, [&] {
            if (pReply->error() == QModbusDevice::NoError)
            {
                bWriteResult = true;
            }
            else if (pReply->error() == QModbusDevice::ProtocolError)
            {
                //QString strErrorMsg = QString("Write Coils response error: %1 (Modbus exception: 0x%2)")
                //    .arg(pReply->errorString())
                //    .arg(pReply->rawResult().exceptionCode(), -1, 16);
                //m_Savelog.writeLog(m_Savelog.path, strErrorMsg);
                //ErrorMessage(strErrorMsg);
            }
            else
            {
                //QString strErrorMsg = QString("Write Coils response error: %1 (code: 0x%2)").
                //    arg(pReply->errorString()).
                //    arg(pReply->error(), -1, 16);
                //m_Savelog.writeLog(m_Savelog.path, strErrorMsg);
            }

            loop.quit();
            connect(pReply, &QModbusReply::finished, pReply, &QModbusReply::deleteLater);
            }
        );
        connect(pReply, &QModbusReply::finished, pReply, &QModbusReply::deleteLater);

        QTimer timer;
        timer.setSingleShot(true);
        connect(&timer, SIGNAL(timeout()), &loop, SLOT(quit()));
        timer.start(RW_TIMEOUT_MS);
        loop.exec();

        QObject::disconnect(con);
        //pReply->deleteLater();
    }

    emit writeCoilsResult(bWriteResult, iStartAddr, uValue);
}

20091001753	2020-12-17 00:15
复制代码 auto reply = m_pModbusDevice->sendWriteRequest(writeUnit, iServerId); connect(reply,&QModbusReply::finished,this,[&,reply]{ switch(reply->error()){ case QModbusDevice::NoError:break; case QModbusDevice::ProtocolError:break; default:qDebug()<<reply->errorString(); } reply->deleteLater(); });

飞翔梦幻

2020-12-17 11:42

20091001753:
[code]auto reply = m_pModbusDevice->sendWriteRequest(writeUnit, iServerId);
connect(reply,&QModbusReply::finished,this,[&,reply]{
    switch(reply->error()){
    case QModbusDevice::NoError:break;
    case QModbusDevice::ProtocolError:break;
.......

有一个异步转同步的过程,在这个地方很容易 stack Flowover  程序奔溃

QTimer timer;
        timer.setSingleShot(true);
        connect(&timer, SIGNAL(timeout()), &loop, SLOT(quit()));
        timer.start(RW_TIMEOUT_MS);
        loop.exec();

uidab	2020-12-17 13:48
飞翔梦幻:有一个异步转同步的过程,在这个地方很容易 stack Flowover 程序奔溃 QTimer timer; timer.setSingleShot(true); ....... (2020-12-17 11:42) QTimer::singleShot(RW_TIMEOUT_MS,this,[=](){ pReply->deleteLater(); loop.quit(); }); 也写成lambda形式

飞翔梦幻	2020-12-17 19:16
uidab:QTimer::singleShot(RW_TIMEOUT_MS,this,[=](){ pReply->deleteLater(); & .. (2020-12-17 13:48) 这样可以，内存还是不断的增加

uidab	2020-12-18 08:25
飞翔梦幻:这样可以，内存还是不断的增加 (2020-12-17 19:16) 那你改成智能指针试试

20091001753

2020-12-20 04:45

首先，QModbusClient 自带超时设置 setTimeout
所以，你只需要初始化时：
m_pModbusDevice->setTimeout(RW_TIMEOUT_MS);

你代码这么改就好：

复制代码

void CModbusTcpClientWorker::onWriteCoils(int iStartAddr, quint16 uValue, int iServerId){
    QModbusDataUnit writeUnit(QModbusDataUnit::Coils, iStartAddr, 1);
    writeUnit.setValue(0, uValue);
    auto reply = m_pModbusDevice->sendWriteRequest(writeUnit, iServerId);
    connect(reply,&QModbusReply::finished,this,[&,reply]{
        if(reply->error()){
            emit writeCoilsResult(false, iStartAddr, uValue);
            qDebug()<<reply->errorString();
        }else emit writeCoilsResult(true, iStartAddr, uValue);
        reply->deleteLater();
    });
}

超时也会触发这个 finish 信号，error 是 QModbusDevice::TimeoutError

neeme	2021-04-16 16:28
你好，我也有这个 modbus tcp 内存累计增加，用rs485串口就没这个问题。请问你解决了吗？

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