Passig types from delphi to DLL

[Nordlund]

Hi there.
I think DLL is a djungle of PChars and pointers ^ and more... But.... I have to use them...

How do I pass Types from Delphi to a DLL av vice versa.

Im going to make a setup which require a serial key validation.
Therefore, the Delphi app has to send a Key (in string format, more than 255 chars) to the dll, and the dll is decoding/extracting the key and then return several things to the Delphi app.

This is the DLL procedure header (But does it work?):

procedure DecodeKeyNew(Key: PChar; var resultKey: TKey); stdcall;

the resultKey is a Delphi ordinary record:

  TKey = record
    Key: PChar;
    KeyLen: Integer;

    HexKey: PChar;
    HexKeyLen: Integer;
  end;

(I'm unable to use the Borland .dll file BORLNDMM.DLL due to other restrictions)


Am I on the right track, or am I lost in space here

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-"There is always another way to solve it, but I prefer my way.

 

[Glenn9999]

Have you attempted it? I assume so or you wouldn't be asking? If I were to guess at this, I would say you'd have to make your result a pointer as well.

 

[Nordlund]

Yep. I have tried anything... (Or at least neraly everything)...

I'm starting to believe the problem is Slphi 2005.... I just installed it, and i get a bunch of weird error messages all the time.

I have used Delphi 7, 5, 3 för at while, but never experienced the same amount of weird messages at all.
Maybe it's Delphi 2005 bugs, but this would be a dumb excuse of bad programming... But i cant stop thinkng.....




~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-"There is always another way to solve it, but I prefer my way.