1. is csoundthread::csound created properly?
2. is it a public member of the class? If it's
protected or private, then accessing it might
be a problem (although this check should happen at
compile time).
3. Does the violation happen at the call to
...setCallback()? Or is it when the callback is
first invoked by csound?


>
> Ok, here's what I'm doing now, I wrap my function in
> extern "C"
>
>
>
> extern "C" {
> extern void csoundMessageCallback(CSOUND *csound,int attr,
> const char  *format, va_list valist);
> }
>
> I then call this callback function from RuncCsoudClick(),
> a public  method in my main class.
>
> void __fastcall TForm1::RunCsound1Click(TObject *Sender)
> {
>      if(!CSOUND_ON)
>        {
>        perfCsound = true;
>        runCsound = new csoundthread(false);
>        RichEdit1->Clear();
>        RichEdit1->Update();
>        csoundSetMessageCallback(runCsound->csound,
> csoundMessageCallback);
>        CSOUND_ON = true;
>        RunCsound1->Caption = "Stop Audio";
>        }
>      else
>        {
>        CSOUND_ON = false;
>        perfCsound = false;
>        RunCsound1->Caption = "Start Audio";
>        }
> }
>
>
> It builds and compiles fine but I still get the same
> access violation  errors.
>
>
>
>
>
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> 1. is csoundthread::csound created properly?
Yes, at least everything else runs fine when I comment out my 
..setCsoundCallback()

> 2. is it a public member of the class? 
Yes.

> 3. Does the violation happen at the call to ...setCallback()? Or 
>is it when the callback is  first invoked by csound? 

Mmm, I just tried to find this out and I noticed that if I put a 
Sleep(100) just before I call CsoundSetMessageCallback() it runs fine, 
messages and everything. Any ideas? I don't mind a slight pause before 
execution.

Rory.



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