Problem in Connecting ctkDoubleSpinBox

[jsulm]

@Meera-Hadid Fix your connect as suggested by @JonB and try again

[Meera Hadid]

@JonB

• Yes when I tried without using & it was raising an error that cannot convert from 'ctkDoubleSpinBox *' to 'const QObject *'

@jsulm

• The issue is not getting pointer the issue is it cannot convert from 'ctkDoubleSpinBox *' to 'const QObject *'

[JonB]

@Meera-Hadid said in Problem in Connecting ctkDoubleSpinBox:

@JonB

Yes when I tried without using & it was raising an error that cannot convert from 'ctkDoubleSpinBox *' to 'const QObject *'

@jsulm

The issue is not getting pointer the issue is it cannot convert from 'ctkDoubleSpinBox *' to 'const QObject *'

Inserting a & randomly will not help. The message already tells that pointer-ness is not the issue.

[jsulm]

@Meera-Hadid said in Problem in Connecting ctkDoubleSpinBox:

The issue is not getting pointer the issue is it cannot convert from 'ctkDoubleSpinBox *' to 'const QObject *'

Do you mean you get same error message if you use new connect syntax?

[JonB]

@Meera-Hadid
Please do the following:

• First, delete all the files from the build output directory. Do a fresh qmake followed by a build. Does the error still occur?
• From the line number in the error message, are you quite sure it is on the connect() statement you have shown, and not some other?
• I believe I already advised this before in answer to the same problem from you in another thread: on the line above the connect() put in

const QObject *temp = this->SliceController->spinBox;

Does that error (show message)?

[Meera Hadid]

@JonB

• const QObject *temp = this->SliceController->spinBox;
  this works
• But the signal SIGNAL(valueChanged(double)) doesn't get activated (QLabel value doesn't change). Is it because temp is returing nullptr?

[JonB]

@Meera-Hadid

Is it because temp is returing nullptr?

Pardon? Are you saying this->SliceController->spinBox == nullptr at the time you execute the connect() statement?

Separately, put a qDebug() statement as the first thing in your void qMRMLSliceWidget::updateLabel().

[Meera Hadid]

@JonB said in Problem in Connecting ctkDoubleSpinBox:

Separately, put a qDebug() statement as the first thing in your void qMRMLSliceWidget::updateLabel().

Yes I did but that statement is not getting printed/executed

[JonB]

@Meera-Hadid
I have asked you other questions. If you don't want to respond to them that is up to you.

[Meera Hadid]

@JonB

• First, delete all the files from the build output directory. Do a fresh qmake followed by a build. Does the error still occur?
  Since there are a lot of files it takes a lot of time to build hence I did not clear the build.
• It's my bad that I assumed this->SliceController->spinBox was returning a nullptr. The problem was with slot I changed it.
• const QObject *temp = this->SliceController->spinBox; worked for me

Thanks everyone for contributing.