Working with Slots

[Ali Reza]

hi all
suppose that i have two QPushButton that named A , B .
i want connect clicked signal of button A,B to a slot that take a parameter(int id).
for example: when i clicked button A, my slot be called with '1' for id parameter and about button B with '2'.
i do not know how to implement this.
i used the following code but gives me some errors.

/* in my class */
private slots:
void myslot(int id);
 
// *********************
/* for use this slot i use the below code */
connect(btn_A , SIGNAL(clicked()) , this , SLOT(myslot(1));
connect(btn_B , SIGNAL(clicked()) , this , SLOT(myslot(2));

/* in my class */
private slots:
void myslot(int id);

// *********************
/* for use this slot i use the below code */
connect(btn_A , SIGNAL(clicked()) , this , SLOT(myslot(1));
connect(btn_B , SIGNAL(clicked()) , this , SLOT(myslot(2));

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[alizadeh91]

salam!
you can't do this. the order of signal parameters have to be same as slot parameters. in other words u can't have a slot that takes one argument and connect it to a signal without any args.

In addition your implementation of signal and slot is incorrect. it's better to have a study about this. In the slot's argument you have to put type of argument not its value! the value is sent by signal

[Zlatomir]

As alizadeh91 already said you should learn the basics about signals and slots from documentation, see this link.

And for your problem a solution might be to use QSignalMapper //but if you only have two buttons you might want to create separate slots connected to click signal and from within those slots call myslot with the corresponding parameter.

[Ali Reza]

thanks a lot a lot ... Mr Zlatomir
my problem solved by using QSignalMapper
thanks again...