qextserialport error

[hezbon]

I am trying to read a serial port using the above class library, and am trying to use the if(port.isOpen()) to check if the port is already opened but the function returns error.

Again I want read data from that serial port now without checking the port is open can somebody show me how to convert the bytedata into string so that i can display it on the text label?

[kuzulis]

Why did you choose QextSerialPort? Try a different library QtSerialPort.

i can display it on the text label?

Of course it is possible, provided that you pass the text

...
QByteArray data = port->readAll();
...
QString s(data);
...
label->setText(s);
...

...
QByteArray data = port->readAll();
...
QString s(data);
...
label->setText(s);
...

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[hezbon]

thanx, but i have realized if i use Qstring directly it reads the data and automatically converts. but there is only one problem that am encountering, i have a device that continually send a value 200 to my com port and my programme waits for readyread so it will pick that value and display it but the values appear as 200200,200,00,0,2,02 so how can i wait for a three digit number that is being sent continually and display the correct value?

[ChrisW67]

Append each received chunk of characters onto a persistent QByteArray buffer. When the buffer has 3 or more characters in it remove the front three to display, repeat until less than three characters in buffer.

[hezbon]

Append each received chunk of characters onto a persistent QByteArray buffer. When the buffer has 3 or more characters in it remove the front three to display, repeat until less than three characters in buffer.

good quote. But the problem is solved. i used a logic to check the data and hold not to display any starting with 0 and should not exceed three.