why it makes me error???:(- please help!

RuWex

I have that code:
and this line of code:

this is public member in mainwindow.h,
and I wrote that
in sendCommand.cpp:
in SendCommand.cpp- I added includ:

But, as you see its maje me error and not recognized m_serial:(

waiting for your help:)

jsulm

@RuWex You should learn basics of C++.
You put m_serial in MainWindow class, but you're trying to access it from SendCommand class - this can't work this way. If m_serial is not static you need an instance of WmainWindow to access it like:

MainWindow mw;
mw.m_serial->...

But this would be very bad design! You should not access internal members of other classes directly. If you really need to have m_serial in MainWindow then make it private and implement public methods to trigger actions on it, like:

class MainWindow...
public:
    void writeSerial(const QByteArray data) { m_serial->write(data); }

Kent-Dorfman

so you are essentially executing

(static_cast<QSerialPort*>(0U))->write(line[i])

and you don't understand why it wont work? Is that the gist of it?

jsulm

@RuWex You should learn basics of C++.
You put m_serial in MainWindow class, but you're trying to access it from SendCommand class - this can't work this way. If m_serial is not static you need an instance of WmainWindow to access it like:

MainWindow mw;
mw.m_serial->...

But this would be very bad design! You should not access internal members of other classes directly. If you really need to have m_serial in MainWindow then make it private and implement public methods to trigger actions on it, like:

class MainWindow...
public:
    void writeSerial(const QByteArray data) { m_serial->write(data); }

RuWex

This post is deleted!

jsulm

@RuWex said in why it makes me error???:(- please help!:

dont recognize m_serial

Because m_serial is part of MainWindow class...

RuWex

@jsulm ou!!!!
thank you!
I dont know what happend to me...:(
sure, you right:)