Class with strings in DLL

[WojTec]

I have a problem, I need to use class in DLL, this class as normal classes has strings as properties and parameters.

I have global variable (object of class), exported functions uses PChar for strings and works on that global variable. DLL compiles. When I try use any function from it, raises AV.

F1

[Sir Rufo]

U have to use the Unit sharemem (in DLL and Application)

[himitsu]

To share string is needed ShareMem.

Classes may not be shared, because using the EXE and DLL separate RTTIs.
> runtime packages

[WojTec]

I thought that this unit is required if parameters are string not PChar. This is bad news I checked that Borlndmm.dll must be present, this is not acceptable for me, do you know pure Delphi solution (with no additional libs)?

[JamesTKirk]

Try the unit "FastMM" instead. If you really use Delphi 2010 it should already be part of the provided units.
It's a solution without another DLL, but you need to use that memory manager in the DLL and the EXE. If you need to interface with another programming language like C you can not use that way, but you must manage the PChars yourself.

Question: Why did you choose "Free Pascal" as language?

Regards,
Sven

[WojTec]

I just googled this unit:

Code:

http://www.codexterity.com/fastsharemem.htm

I didn't knew that FastMM4 unit can be used as replacement too, thanks for this tip

I'm using D2010, FreePascal I selected by mistake, sorry

I have next question, I used global (for DLL) record (it contains string and integers). When I used FastMM it detected memory leaks, when I nulled this record (rec.string := '', etc) memory leaks not occured. Why?