hi,everyone,i have a question about "QButtonGroup"

[to_guliang]

i want to put some QAbstractButtons on the QButtonGroup,and then when one of them is pressed down,the signal"void QButtonGroup::buttonPressed ( QAbstractButton * button ) " is emitted.
my code:

ButtonGroup = new QButtonGroup(this);
QAbstractButton *button1;
button1 = new QAbstractButton(this);
ButtonGroup->addButton(button1);

ButtonGroup = new QButtonGroup(this);
QAbstractButton *button1;
button1 = new QAbstractButton(this);
ButtonGroup->addButton(button1);

To copy to clipboard, switch view to plain text mode 

there is error like this " cannot allocate an object of abstract type ‘QAbstractButton’"
it seems that the red color area is wrong

why? how can i realize the function? May I get the correct code?

thanks very much for any advices!!

[aamer4yu]

QAbstractButton is an abstract class I guess

For your code , it should be -

ButtonGroup = new QButtonGroup(this);
QPushButton *button1;
button1 = new QPushButton(this);
ButtonGroup->addButton(button1);

ButtonGroup = new QButtonGroup(this);
QPushButton *button1;
button1 = new QPushButton(this);
ButtonGroup->addButton(button1);

To copy to clipboard, switch view to plain text mode 

Hope it helps

[to_guliang]

thanks a lot, but the code doesn't work.
code:

QButtonGroup *btnGroup;
btnGroup=new QButtonGroup(this);
QPushButton *button1;
button1 = new QPushButton("LD",this);
btnGroup->addButton(button1,0);
button1->setGeometry(QRect(175,85,45,43));
connect(btnGroup,SIGNAL(ButtonClicked(int)),this,SLOT(show_IL(int)));

QButtonGroup *btnGroup;
btnGroup=new QButtonGroup(this);
QPushButton *button1;
button1 = new QPushButton("LD",this);
btnGroup->addButton(button1,0);
button1->setGeometry(QRect(175,85,45,43));
connect(btnGroup,SIGNAL(ButtonClicked(int)),this,SLOT(show_IL(int)));

To copy to clipboard, switch view to plain text mode 

the code in show_IL:

if(i == 0)
{
   QString str = "LD";
   list->addItem(QString(str));
}

if(i == 0)
{
   QString str = "LD";
   list->addItem(QString(str));
}

To copy to clipboard, switch view to plain text mode 

when the button1 is clicked, there is nothing show on my list! the slot doesn't work!

please help me!

[songqiming]

you can connect every button to a signal solely or you should debug the program to see the value of i.

[to_guliang]

you can connect every button to a signal solely or you should debug the program to see the value of i.

i can realize connecting every button to a signal solely. i have 20 buttons, there are so many code to do like that.if i can use ButtonGroup,there will be much easy.
and i just debug the program to see the value of "i"; it proves that the slot doesn't work.
how should I do?

[aamer4yu]

u mean the slot is not called ??

are u using the same line ??
signal is buttonClicked, not ButtonClicked .... is this the prob ??

[jpn]

It's "SIGNAL(buttonClicked(int))" not "SIGNAL(ButtonClicked(int))".

[to_guliang]

yeah, it's the problem,thanks for everyone
i'm sorry for delaying reply,i just come back from my vocation