[Basic question] Signals & Slot

[GortiZ]

Hi to all,
I'm starting with QT4 and I need to connect an "int" signal to a "double" slot.
I've tried with:

QSpinBox::connect(mw_ui->spinbox_LineNumber, SIGNAL(valueChanged(int)), &(*mw_ui->qwtSlider_LineNumber), SLOT(setValue(double)));

QSpinBox::connect(mw_ui->spinbox_LineNumber, SIGNAL(valueChanged(int)), &(*mw_ui->qwtSlider_LineNumber), SLOT(setValue(double)));

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but I receive the message:
Incompatible sender/receiver...

I've searched on google how to solve this problem.. but I havn't find nothing..
could someone help me?
Thanks
GortiZ

[^NyAw^]

Hi,

You can't connect a signal that emits a type and a slot that recives another type.

Read the doc about signals and slots.

[GortiZ]

I've already readed that I can't connect different types, but I need to change the value in the spinbox with the one in the slider so i'm asking if there's a way to do this or a workaround to make this working..

Thanks for the answer

[wysota]

Create a custom slot and connect the signal to it and from the custom slot simply call the original slot as a regular function.

[GortiZ]

sorry i'm a newbye.. could you link me to a page where i can find a documentation on how to create custom slots?

Thanks a lot

[wysota]

It's all in Qt's documentation. Read the tutorial there.