Cascades Development

[gyubok]

Hi, how would I catch when the user exits the app? I would like to do save some user setting before the app exits.

[peter9477 · Accepted solution]

The proper way to do this is generally to set autoExit = false and process the manualExit() signal.

See https://developer.blackberry.com/cascades/reference/bb__application.html#manualexit

[gyubok]

Thanks Peter,

As I am very new to dev, I have some basic questions.

I connected the event to a slot

QObject::connect(app, SIGNAL( manualExit() ), this, SLOT( onManualExit() ));

but inside onManualExit(), after I save everything, how do I actually quit the app?

[peter9477]

When you're ready, just call Application.quit() https://developer.blackberry.com/cascades/reference/qcoreapplication.html#quit

[gyubok]

Thanks Peter!

[StevenKader]

I am trying to  - 

 app.setAutoExit(false) ;

 but app is now not linking.  I get this error : 

undefined reference to symbol '_ZN2bb11Application11setAutoExitEb'

Anyone seen this.  Thanks.

[Zmey]

Add the following line to .pro file:
LIBS += -lbb

[StevenKader]

---

Zmey wrote:
Add the following line to .pro file:
LIBS += -lbb

---

Thanks...that worked.   I looked all over to see if I was missing another library (why can't the IDE add those automatically) but didn't find it.  Could you let me know where I should have seen it so I know for the next time.  Thanks.

[Zmey]

Sometimes it's mentioned in docs, but not always:

http://developer.blackberry.com/cascades/reference/bb__application.html

It's often possible to guess the library name. BB libs follow this convention:

#include <bb/cascades/...> the corresponding lib is libbbcascades.so which becomes -lbbcascades key.

#include <bb/device/...>: -lbbdevice

and so on.

The convention is not mandatory though so it might be hard to automate.

Grepping by function name in target's libraries folder can also give hints. If the function is declared in system headers then the implementation should also be present somewhere.

[StevenKader]

Got it....thanks.