Access MainWindow controls from callback function

column

Hello,

What is the best way to access MainWindow controls from callback function?

For example I have callback function that was initialized by passing to .so library function parameter. *.so library is going to update progress status by using it.

cb(int value)
{

}

And I need to show value in text box of tbCommandReturnMessage. Can I somehow use signals and slots for this purpose?

jsulm

@column You can use a singleton for this:

class CallbackHandler: public QObject
{
signals:
    void someSignal(int);

public:
    static CallbackHandler* instance() {
        static CallbackHandler* i = new CallbackHandler();
        return i;
    }
    void doSomething(int value) { emit someSignal(value); }
};

void cb(int value)
{
    CallbackHandler::instance()->doSomething(value);
}

SGaist

Hi,

What is the signature of that callback ?