Inconsistent behavior of QSerialPort on Debian

SGaist

From your description, are you opening the same port 3 times ?

Hjunior

No friend they use base same class. The instances are set to use DIFFERENT PORTS as ttyS1,ttyS4,ttyS6

SGaist

All of them physical ports of your computer or converter like usb to serial ?

Hjunior

@SGaist Yes all of them are phsical ports of my computer. NO usb to serial.

SGaist

Does it also happen if you change devices e.g. exchange the devices from ttyS1 and ttyS6.

Hjunior

@SGaist No difference.

SGaist

Does the devies need the DTR to be set ?

Hjunior

@SGaist Yes the device uses Hardware flow control and in the technical manual says it uses DTR/DSR.

SGaist

Silly question but, did you set DTR in your application ?

Hjunior

Hello again,

I finally figured out how this occurs.

BaseSerialDevice.cpp

class BaseSerialDevice : public QObject
{
    Q_OBJECT
....
protected:
    QSerialPort *serial;
....

Problematic.cpp

class Problematic : public BaseSerialDevice
{
    Q_OBJECT
...

MainWindow.h

...
private:
    Problematic worksLikeACharm;

Everything works as expected if defined as a NON-POINTER but if;
MainWindow.h

...
private:
    Problematic* notWorksSo;

then in MainWindow.cpp's constructor:

notWorksSo = new Problematic(parent()); 
or 
notWorksSo = new Problematic(NULL); 
or 
notWorksSo = new Problematic;

the problem occurs as defined at the start of this topic. And same situation occurs if we use QSocket as same architecture.

I tested it from scratch at least 6 times. Im sure of that case.

And Cant believe and cant understand why?

SGaist

And if you build it with Problematic(this) ?

When you don't pass it a parent, do you delete it in the destructor of your MainWindow ?

Hjunior

I am tried with Problematic(this) no change. In case of no parent arg i tried with delete, but nothing changed.

I tried making it static as
MainWindow.h

static Problematic* notWorksSo;

MainWindow.cpp

Problematic* MainWindow::notWorksSo = 0;

then in constructor

notWorksSo = new Problematic(this);

NOTHING CHANGED.

Any ideas?

SGaist

Without seeing the implementation of these classes I can't tell.