Re: [OpenSIPStack] Problem with OnOutgoingCallConnected

[Ilian J. C. P. <ip...@so...>]

Hello.

tomach wrote:
> Hello!
>
> Ok call connections works fine etc... 
> I would like to ask how your activex works?
> How your activex works? When call is created? is it working in separate thread then main winform application? Bacause I noticed that winforms do not hang and react normally so its ok (main thread is not stoped).
>
> But my problem is that when I run your application (sample VB) under visual studio events come but they do NOT update controls. When I run the same application under cmd line everything works fine events come and update controls.
>
> Do you had similar reaction under Visual Studio 2005?
>   
Hmmm.

Yep. ATLSIP events come from a separate thread...

.NET is strict with regards to cross-thread UI updates (especially with 
VS 2005). You may need to marshall UI updates to the UI thread for the 
update to work.

For example with the ATLSIP_OnOutgoingCallTrying event, instead of 
invoking lblStatus->Text directly from this separate thread you will 
need to tell the UI thread to do it. Like this:

System::Void ATLSIP_OnOutgoingCallTrying(
  System::Object^  sender,
  AxATLSIPLib::_IOpenSIPStackCtlEvents_OnOutgoingCallTryingEvent^  e) {

  // lblStatus->Text = L"Status: Trying"; // This does not work
 
  SetText( lblStatus, L"Status: Trying" ); // This works.
}

delegate void SetTextCallback( Control^ control, String^ text);

void SetText( Control^ control, String^ text )
{
    if ( control->InvokeRequired ) 
    {
       // We are NOT on the UI thread so we need to marshal
       SetTextCallback^ settext = gcnew SetTextCallback( this, 
&OSSPhone::Form1::SetText );
        this->Invoke( settext, gcnew array<Object^>{ control, text } );
    } else
    {
       // We are on the UI thread. No need to marshal
       control->Text = text;
    }
}

The same logic applies with all other kinds of UI update. Anyway, this 
is .NET-specific stuff. You can search for .NET InvokeRequired for 
further reading.

Regards,
Ilian
> I am really curious why is it happening? any suggestions?
>
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