Re: Waiting for callbacks from dll on Win32

["Warren W. Gay VE3WWG" <ve3wwg@cogeco.ca>]

Stephen Leake wrote:
> Bj�rn Lundin <bjorn.lundin.nospam@swipnet.se> writes:
>>Hello!
>>I'm trying to make an interface to a c-dll that
>>connects to an OPC-server (WTclient.dll)
>>
>>It wants a pointer to a procedure, which I can provide 
>>with an access value to a procedure in a protected object.
> 
> 
> Calling a procedure in a protected object is _not_ the same as calling
> a "normal" procedure; there are tasking issues involved.
> 
> Wrap the protected object call in a "normal" procedure, and use that
> as the callback.
> 
> Even then, you have to worry about the Ada tasking vs the C tasking.
> If you have an Ada main, you are probably ok.

I think you also have to keep in mind that DLL tasks are
separate from your calling environment.  So this may
complicate things depending upon the details.

-- 
Warren W. Gay VE3WWG
http://home.cogeco.ca/~ve3wwg