How to change the implementation (detour) of an externally declared function

Question

I have a third party function

function DataCompare(const S1, S2: string; APartial: Boolean): Boolean;
begin
   ...
end;

It is used in anot

Answer 1

I think JCL has some utils for this kind of stuff... I haven't used it myself but had a quick look and following items look promising:

jclSysUtils.WriteProtectedMemory()
jclPeImage.TJclPeMapImgHooks.ReplaceImport()

I think the jclHookExcept.JclHookExceptions() demonstrates how to use them.