Regarding Projector Programming using QT

[Prath]

Sorry for the delay guys. I tried again with the code and couldn't retrieve anything from the serial port regarding the errror.
I got the attached error:-

[SGaist]

Your MainWindow class does not have such a signal, it's one from the QSerialPort.

[Prath]

Didnt get you @SGaist .
Could you please help me with the syntax

[Prath]

When I click on the push button the function on_pushButton_clicked is called and then I call the Qserialport to check the error. I think the code is written correctly.

What's your take?

[jsulm]

@Prath said in Regarding Projector Programming using QT:

What's your take?

Your connect is wrong: MainWindow does NOT have signal error(QSerialPort::QSerialPort), this signal is in QSerialPort, so not in "this" but in "serial".

And please do not post screen-shots, copy paste your code...

[JonB]

@jsulm , @Prath

this signal is in QSerialPort, so not in "this" but in "serial".

Is this a case where changing to new-style signal/slot syntax would generate an error for the wrong "context" variable? Or, would testing the return result from the connect() or from https://doc.qt.io/qt-5/qmetaobject-connection.html#operator-bool in code tell the user if the connection has failed because of the wrong context?

[jsulm]

@JonB Yes, new connect syntax would help here, unless MainWindow has a signal with exact same signature :-)

[Prath]

Guys can we send two commands to two serial ports concurrently using QT?

[SGaist]

If you mean use several QSerialPorts at the same time in one application then yes, no problem with that. If you mean something else, please give more details.

[Prath]

This post is deleted!