Re: Waiting for callbacks from dll on Win32

["Björn Lundin" <bjorn.lundin.nospam@swipnet.se>]

Warren W. Gay VE3WWG wrote:

> 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.
> 

I don't quite understand, could you elaborate a bit?
/Bj�rn