How to Send a signal to external program using pushbutton

[arunvv]

Hi All,

How to Send a signal to external program using pushbutton?

Thanks & Regards,
Arun.

[mcosta]

How to Send a signal to external program using pushbutton?

What means "signal"?

POSIX signals, Qt signals, ...

[lyuts]

I think this is the case when one should use DBus (QtDBus in particular)

[nrabara]

Hi All,

How to Send a signal to external program using pushbutton?

Thanks & Regards,
Arun.

Hi Arun,
Did you find how to send signal to external program using push button?
I have been using similar application in which i need to intimate other hardware onclick on any buttons.

I have used Dbus, I am able call function of other process using dbus but, to know whether the button has clicked or not, I have to continuously poll.

Is there any solution ?

Your suggestion would be highly appreciable.

With Regards,
Nirav Rabara

[QbelcorT]

Hi,
If you are using QtEmbedded take a look at QCopChannel. It's sort of the same style as QtDBus, without any external libraries.
As far as knowing the state of the button, just setup a state variable, (bool) for example, set it true when the button is pressed and false when the button is pressed again. (toggle). Your external program can keep track of this. Your Qt program just needs to send the event. When your external program receives the event just xor the bool flag. Just be careful if your external program and QT get out of sync.

RecieveEventFromQt()
{
state ^= true;
if (state == true)
 button is pressed;
else
 button is not pressed;
}

RecieveEventFromQt()
{
state ^= true;
if (state == true)
 button is pressed;
else
 button is not pressed;
}

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[jpn]

Inter-Process Communication in Qt