QML SerialPort: using readAll or readLine but receive multi lines

taind

I want to received data only 1 line/1time.Thank in advance
open serial:

void SerialPort:: openSerialPort (QString comName, int baudRate) {
     ...
     connect (serial, SIGNAL (readyRead()), this, SLOT (readFromSerialPort()));
}

read from serial funtion

void SerialPort::readFromSerialPort() {
\\      if (serial->canReadLine())
\\     {
             QByteArray data = QByteArray (serial->readAll());
             emit getData (data.toHex());
 \\     }
}

...
qml file:

Connections {
     target:  MySerial
     onGetData: {
          textArea.append(data)
     }
}

this is result (3 lines):

dheerendra

readAll reads all the data. Did you try with read(..) or readLine(..) with maxsize ?

taind

I already tried with read and readLine but same result

jsulm

@taind It should work with canReadline and readLine. How is the data sent? What data is actually sent? You convert it to hex - is it possible that you're sending binary data?

taind

@jsulm i received from XCTU software and I don't know why "serial->canReadLine()" this case is always "false"

jsulm

@taind said in QML SerialPort: using readAll or readLine but receive multi lines:

XCTU software

I don't know what it is and what data it is sending. If it sends binary data I would not expect to be able to read it correctly line by line. You really should first clarify what type of data you actually get (binary? text?).

J.Hilk

@taind said in QML SerialPort: using readAll or readLine but receive multi lines:

@jsulm i received from XCTU software and I don't know why "serial->canReadLine()" this case is always "false"

probably because your frame doesn't end on 0x0A ? the last one seems to be 0xFD

taind

@jsulm if I don't convert toHex().. data return text type when readLine from serial

taind

@J-Hilk Thank you for answer!
I think so. Some frame finish with "checksum" . Maybe need a intermediary var to handle them.

jsulm

@taind said in QML SerialPort: using readAll or readLine but receive multi lines:

data return text type when readLine from serial

That doesn't mean that the other side is sending text...

JonB

@taind
Since you do not seem to have any idea what bytes are being sent to you, before trying to "read lines" you should really just use readAll() and (convert the bytes to hex if you wish) look at what is being actually being sent before proceeding to code.

taind

@jsulm Thank you so much for supporting!
I tried with Hercules or Terminal v.1.9 software. XCTU software only respones when receive hex and return text or hex. But probably my problem because of XCTU received/ sent type data