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unit main;

interface

uses
  Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
  Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls;

type
  Tfrm_main = class(TForm)
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
  private
    { Private-Deklarationen }
    myConStr: PCHAR;
  public
    { Public-Deklarationen }
  end;

type
    PRfcErrorInfoEx = ^TRfcErrorInfoEx;
    TRfcErrorInfoEx = record
      group : integer;
      key : array[0..32] of char;
      amessage : array[0..512] of char;
    end;

function RfcOpenEx(ConString: PCHAR; RFC_ERROR: PRfcErrorInfoEx): THandle; stdcall; external 'D:\_Entwicklung\SAPmitLIBRFC32_App\Win32\Debug\librfc32.dll';

var
  frm_main: Tfrm_main;


implementation

{$R *.dfm}



procedure Tfrm_main.Button1Click(Sender: TObject);
var myHandle: Long;
    data: PRfcErrorInfoEx;
    myError: TRfcErrorInfoEx;
    blubb: integer;
begin
 myConStr:= 'ASHOST=1xxx SYSNR=0 CLIENT=xxx USER=xxx PASSWD=sxxx LANG=DE';
 myHandle:= rfcOpenEx(pchar(myConStr), @myError);
 blubb:= myError.group;
end;

end.