Re: [Quickfix-developers] Function problem in vb.net

[Oren M. <or...@qu...>]

> I'm just guessing here, but I'd guess the onCreate call is probably  
> running on your main thread (you instantiate a QF Application- 
> derived object, which creates the sessions, which call the  
> "onCreate" callback), while the onLogout is coming from the  
> internal QF socket thread (this is an asynchronous callback). The  
> first one works because you are in the "main" or "GUI" thread,  
> while the second one fails because you are on a different thread.

Bingo.  Likewise toApp is called from the thread sendToTarget was  
called from, and fromApp is called from the QuickFIX thread.  But  
this and the above scenario isn't always the case (think poll and  
block instead of start), and this behavior might not always be the  
case in the future (possible addition of a sending thread in the  
future).  So really in a forms app I would always recommend using  
Invoke and InvokeRequired when updating a control from a QuickFIX  
callback.

--oren