<Solved> Linux library access violation

[ChrisX]

I get an "Access violation" when I call a function from a C library.

Not sure if I can explain well enough, so I will just post the code:

The C library:
#include <stdio.h>
#include <string.h>

int testreturn(const char *thename, char *rcity, char *rstate)
{

     memcpy (rcity,"Boston",7);
     memcpy (rstate,"Massachusetts",14);

return strlen(thename);
}

The C library is compiled and named libTester.so

The code I call to the function from is:

unit Unit1;

{$mode objfpc}{$H+}

interface

uses
  Classes, SysUtils, LResources, Forms, Controls, Graphics, Dialogs, StdCtrls,
  Buttons, StrUtils;

type

  { TForm1 }

  TForm1 = class(TForm)
    Button1: TButton;
    Edit1: TEdit;
    Edit2: TEdit;
    Edit3: TEdit;
    procedure Button1Click(Sender: TObject);
  private
    { private declarations }
  public
    { public declarations }
  end;

var
  Form1: TForm1;
  function testreturn(thename:pchar;rcity:pchar;rstate:pchar):integer; stdcall; external 'libTester';

implementation

{ TForm1 }

procedure TForm1.Button1Click(Sender: TObject);
var
    rlines : array[0..1] of string;
    retint : integer;
    ganame : string;
begin
  ganame := Trim(Edit1.Text);
  rlines[0] := StringOfChar('0', 80);
  rlines[1] := StringOfChar('0', 80);
  retint := testreturn(pchar(ganame), pchar(rlines[0]), pchar(rlines[1]));
  Edit2.Text := AnsiLeftStr(rlines[0], pos(Chr(0), rlines[0]) - 1);
  Edit3.Text := AnsiLeftStr(rlines[1], pos(Chr(0), rlines[1]) - 1);
  Form1.Caption := 'Name Length: ' + inttostr(retint);
end;

initialization
  {$I unit1.lrs}

end.

It works well but, I get a message box that pops up that says "Access violation" press OK to continue and risk possible data corruption or Cancel to exit.

I click OK and its fine. It returns everything correctly. That message box is a pain though. I tried:
try
  retint := testreturn(pchar(ganame), pchar(rlines[0]), pchar(rlines[1]));
except
//do something
end;

But the program just quits.

Any help?

Thanks

Edit:
I changed  function testreturn(thename:pchar;rcity:pchar;rstate:pchar):integer; stdcall; external 'libTester';

to

 function testreturn(thename:pchar;rcity:pchar;rstate:pchar):integer; cdecl; external 'libTester';

and all is good