extern "C" __declspec( dllimport ) __stdcall BOOL EP_RegDeleteKey();

function EP_RegDeleteKey : boolean; stdcall;

Public Declare Function EP_RegDeleteKey Lib "enigma_ide.dll" () As Boolean

public class Enigma_IDE
{
    [DllImport("enigma_ide.dll", CallingConvention = CallingConvention.StdCall)]
    public static extern bool EP_RegDeleteKey();
}

uses 
  enigma_ide; // the module contains a definitions of Enigma API

function DeleteRegistrationInformation : boolean;
begin
  Result := fasle;
  if EP_RegDeleteKey then // delete the registration information
  begin
    MessageBox(0, 'The registration had been deleted successfully!', 'Application', 0); 
    Result := true; // return successful result
  end;
end;

#include "include/enigma_api.h" // the module contains a definitions of Enigma API
#pragma link "include/enigma_ide.lib"

BOOL DeleteRegistrationInformation()
{
  if (EP_RegDeleteKey()) // delete the registration information
  {
    MessageBox(0, "The registration had been deleted successfully!", "Application", 0);
    return TRUE; // return successful result
  }
  return FALSE;
}