iOS Question libDev return from raiseEvent

[nobbi59]

Hello,

Im writing a Library right now and Im trying to raise an Event in B4I, then I want to get the return value from this Event.

When I raise the Event, the App crashes and the Log says the following:

Unexpected event (missing RaisesSynchronousEvents): wv_test:::
SignalHandler 11
Error occurred on line: 0 (act_cstm)
Signal - 11

I can't figure out why this is happening. I even set "RaisesSynchronousEvents:true"...

Heres a bit of code of my Library:

//~Event:PageFinished (Url As String, Success as Boolean)
//~Event:OverrideUrl (Url As String)
//~Event:function (fname As String, params As String, ret As String)
//~RaisesSynchronousEvents:true

Here Im calling the Event:

NSString* evtname = [NSString stringWithFormat: @"%@%@", @"_", param];
    evtname = [NSString stringWithFormat: @"%@%@", evtname, @":::"];
    NSLog([NSString stringWithFormat:@"%@%@",@"CallSub triggered with ", evtname]);
    NSString* ret = [B4IObjectWrapper raiseEvent:self :evtname :@[param2,param3,param4]];
    NSLog(ret);
    return ret;

I hope someone can help me with this issue.

 

[Erel]

You need to add: //~RaisesSynchronousEvents:true
right above the public method that caused this event to be raised (probably wv_test).

 

[nobbi59]

Don't know if I understand you right @Erel. I put it in the .h file right above the function where I am calling the event:

//~RaisesSynchronousEvents:true
- (NSString*) CallSub: (NSString*) param : (NSString*) param2 : (NSString*) param3 : (NSString*) param4;

Contents of the function are the ones mentioned in my 1st post.

Unfortunately its still not working. Throwing the same error.

 

[nobbi59]

@Erel may it be a problem that the method that raises the Event is triggered through invocation?

 

[Erel]

Is your method named CallSub? What are you trying to do?

 

[nobbi59]

Yes. Im wrapping a objc Library for a Javascript Interface like the one in android. Everything works fine except returning from b4i to my objc lib.

 

[nobbi59]

Maybe you should know that the event name is not fix. its a variable set through javascript.

 

[Erel]

Where is the code of wv_test?

 

[nobbi59]

wv_test is a b4i Sub. Not part of my library.

 

[Erel]

Start with a CallSubDelayed implementation and use B4IObjectWrapper raiseEventFromUI.

 

[nobbi59]

but raiseEventFromUI doesnt have a return value, its a void.

 

[Erel]

That's true. It is useful in cases where you don't need to return a value.

 

[nobbi59]

Yes understand that but i need to return a value. This is where the error is happening. if i write the code without expecting a return value, everything is fine.

 

[Erel]

My guess is that your code is not running on the main thread.

 

[nobbi59]

Good idea @Erel. I changed my code and now im calling the method with:

[interface performSelectorOnMainThread:@selector(CallBISub:) withObject:args waitUntilDone:YES];

But im still getting the same error

 

[Erel]

Hard to say without debugging your library code. You can run it in release mode. It might provide different information.

 

[nobbi59]

Thanks @Erel, after I was struggling to set up everything in the library for Release mode (armv7 architechture) I found out that its working fine in release mode (seems strange to me).
In debug mode its still crashing with the same error...Maybe im missing some configuration or something like that?

 

[Erel]

Make sure that no event is raised on a different thread. It will look like it is working in release mode though you will encounter other issues eventually.

 

[nobbi59]

Yes, im always checking the thread the library is running on and it always tells me that its the main thread, so issue cannot be the thread.

For me its working now, but before i release the library to the forums, i will make sure its also working in debug mode.