[fpc-pascal] Re: Passing objects to libraries and back

[Jonas Maebe]

On 26 Feb 2011, at 11:15, Michael Van Canneyt wrote:

> On Fri, 25 Feb 2011, leledumbo wrote:
> 
>>> can i pass ansistrings ?
>> 
>> Yes, but only if you know what you're doing. NEVER modify the passed strings
>> (it would confuse the reference counting). Use const parameter all the time.
> 
> It will almost certainly lead to memory leaks, because a simple
> a:=b;
> inside the library with b passed on from the main program, will lead to problems as soon as the library is unloaded.

It shouldn't matter with cmem/sharemem, because
a) unloading a library from within one of its own routines is not possible, so there cannot be any local variables in the shared libraries holding a reference at such a point
b) global variables are finalised when the library is unloaded


Jonas