What is qDebug() and 'bb.action.START '.

1. I see this code in the sample of BB

application of BB::System:InvokeRequest;

request.setTarget ("com.example.HeadlessApp");
request.setAction ("bb.action.START");
m_notify-> setInvokeRequest (request);

I understand the code. But when I try to study more, I don't see any official/unofficial document on action 'bb.action.START '.

The problem is that if BB doesn't provide good technical document, and if the developers never try this sample, how can developers know and use 'bb.action.START' in their application.

And there is no guarantee that this is the only stuff without papers.

Any idea on this?

2. generate an app by Momentics 2.1.2 headless and the latest version of the SDK. After that, I tried to undertand qDebug() executes the flow of it. While qDebug() works welll most on-site, but in main() and HeadlessAppService Builder, (part headless), qDebug never show anything.

Any help on this will be appreciated!

Thank you very much.

You're right, that I point you to the documentation for bb.action.system.STARTED.  bb.action.START is not a predefined system value, it's just what has been used in this sample.  Applications that receive requests for appeal can define actions they want.  This example uses bb.action.START, which he composed.  Think of it like a MIME type.  You can use a common MIME type or make up your own.

There are some more frequent applications BlackBerry use as:

bb.action.SHARE

bb.action.OPEN

bb.action.VIEW

Third-party applications can use these where it makes sense, but are not required to use actions that match those that we used.

qDebug will work in debug and run mode.  But note that a headless application starts differently than a user interface application.  When you debug an application user interface, the application is loaded, started by blocks and Momentics immediately until the debugger attaches.  Running a headless application that uses bb.action.system.STARTED will be launched by the operating system as soon as it is installed.  The debugger attaches quickly after but generally not soon enough for the start of the constructor because it does not block waiting for the debugger start attaches.

Tags: BlackBerry Developers

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