Class with strings in DLL

[WojTec]

So, it's global variable in DLL project file. Initialization id done by call specified function, function fills record with data. To null it I must call next function, because DLL entry procedure seems to not work.

Delphi-Quellcode:

procedure DLLIO(dwReason: DWORD);
begin
  case dwReason of
    DLL_PROCESS_ATTACH: {...};
    DLL_PROCESS_DETACH: {...};
    end;
  end; 
end;

begin
  DllProc := @DLLIO;
end.

[WojTec]

I did it with external memory manager

But now I need use functions and classes with string parameters, I won't use memory manager, just PChar. How can I do it?

[SirThornberry]

If you use PChar and so you don't need Sharemem.

Zitat:

When I try use any function from it, raises AV

Do you have this Problem only if you have strings in your dll? I suppose you have source like this:

Delphi-Quellcode:

function GetString(): PChar;
var
  mystring: string;
begin
  mystring := 'hello world';
  result := myString;
end;

If you have such source code you will get an AV because PChar is only a Pointer (of a special type). But after leaving this funktion "mystring" is freed and so "result" points to freed memory.

It would be interesting if you get the AV during the call or later when you use the result.

[WojTec]

Yes, I have code like function above. So, how make it working?