i want to pause my running game using Qt qml for symbian .

[DanSiddiqui]

i am developing application using Qt (Qml) for symbian^3 devices, i want to pause my running game if user click some invalid button like mobile’s camera button.

[gnuton]

What's the question?
Do you want to know how to catch the mobile's camera button or you are interested in knowing how to pause a QML Game?
The answer at the second question is: Depends on your game.

BTW In case you are interested in to pause the game when your application is not shown anymore, for instance when it's covered by the camera application, then in this case you can filter WindowActive/WindowDeactivate Qt events to pause your game.