how to read one line use the QSerialPort

[xiongxiongchuan]

void MainWindow::readData()
{
QByteArray data = serial->readAll();

infoConsole->PutData(data);

if(data.count()>0 &&data.endsWith('\n'))
{
infoConsole->PutData(data);


infoConsole->PutData(readjson(data,"msg"));
tempPanel->setNumber(readjson(data,"temp").toFloat());
tempPanel->setUnit("Centigrade");

humPanel->setNumber(readjson(data,"Humidity").toFloat());
humPanel->setUnit("%");

}
}


QString MainWindow::readjson(QByteArray data,QString jasonName)
{
qDebug()<<data<<"\n";
QJsonParseError json_error;
QJsonDocument parse_doucment = QJsonDocument::fromJson(data, &json_error);
if(json_error.error == QJsonParseError::NoError)
{
if(parse_doucment.isObject())
{
QJsonObject obj = parse_doucment.object();
if (obj.contains(jasonName))
{
QJsonValue objectValue = obj.take(jasonName);
if(objectValue.isString())
{
return objectValue.toString();
}
}
}
}

return NULL;
}


and the data is {"Temp":{"temp":27.00000,"unit":"centigrade"},"Humidity":{"humidity":60.00000,"unit":"%"}}

i use the
connect(serial, SIGNAL(readyRead()), this, SLOT(readData()));

i also use the QSerialPort ReadLine(), it dosen't work at all ;


i am waiting for your answer!
thanks!

[xiongxiongchuan]

anyone online can help me ?please

[anda_skoa]

Data arrives in blocks. Check if a block contains the line break. if it does not, store the data and wait for the next block.

Cheers,
_

[xiongxiongchuan]

i have tried many ways to solve this problem ,but always failed to read the whole line,can you tell more information and more specify in code ways,thank you!

Added after 44 minutes:

QSerialPort::readline() dosen't work

[xiongxiongchuan]

QSerialPort::readline() dosen't work ! how to read one line ?