[Lazarus] Newbie, porting class to FPC but get procedure assignment error

[Bo Berglund]

On Mon, 22 Jun 2015 09:16:20 +0300, patspiper <patspiper at gmail.com>
wrote:

>On 22/06/15 02:00, Bo Berglund wrote:
>>
>> I just made a first test by adding the object to my main form as a
>> private variable.
>Which object? Better show the code.

Here is the current state of the main form where the object is
handled:

unit FormMain;

{$mode objfpc}{$H+}

interface

uses
  Classes, SysUtils, FileUtil, Forms, Controls, Graphics, Dialogs,
StdCtrls,
  ExtCtrls,
  Sentinel;

type

  { TfrmMain }

  TfrmMain = class(TForm)
    btnFindKey: TButton;
    stxSerialNo: TStaticText;
    procedure btnFindKeyClick(Sender: TObject);
    procedure FormClose(Sender: TObject; var CloseAction:
TCloseAction);
    procedure FormCreate(Sender: TObject);
    procedure Timer1Timer(Sender: TObject);
  private
    { private declarations }
    Dongle: TSentinel; <== My private object variable
  public
    { public declarations }
  end;

var
  frmMain: TfrmMain;

implementation

{$R *.lfm}

{ TfrmMain }


procedure TfrmMain.btnFindKeyClick(Sender: TObject);
var
  SerialNo: word;
begin
  //Code to check for the dongle and if found display its contents
  Dongle.InitKey; <= I get the exception here
  Dongle.AppNumber := 1;
  if Dongle.CheckKey then
  begin
    SerialNo := Dongle.SerialNo;
    stxSerialNo.Caption := IntToStr(SerialNo);
  end;
end;

procedure TfrmMain.FormClose(Sender: TObject; var CloseAction:
TCloseAction);
begin
  Dongle.Free; <= Destroying the object
end;

procedure TfrmMain.FormCreate(Sender: TObject);
begin
  Dongle := TSentinel.Create; <= Creating the object
end;

end.
      
>> "Project DongleTest raised exception class
>> 'External: SIGSEGV'."
>The 1st thing that comes to mind is that spromeps.obj is 32 bit and your 
>Lazarus/fpc and Windows are most probably 64 bit. But I am not sure how 
>the compiler/linker would react to that.

I think I create a 32 bit application, see below.

>You had posted previously:
>Input file: SPROMEPS.obj, output file: SPROMEPS.coff
>Converting from OMF32 to COFF32 <--------------------------------
>Not adding or removing underscores for this filetype
>Warning 1211: 270 comment records ignored
>
>Do you have a 64 bit version of spromeps.obj?

No, this is legacy code and is only for 32 bit applications.
SafeNet has created the driver for both 32 and 64 bit Windows, but the
64 bit driver is still used for 32 bit applications (like mine). Has
always worked fine with the Delphi apps (used since end of the
1990:s).

They did not provide a SPROMEPS.obj file for 64 bit Delphi maybe
because that does not really exist yet (according to the Embarcadero
user forum the newly released 64 bit compiler is not ready for prime
time...)

Question:
Could it be that Lazarus is anyway compiling for a 64 bit application
since it is installed on a 64 bit Windows 7 laptop?
I just assumed that the main application would be 32 bit as is the
case for Delphi....

But if I go into Project Options and look at Compiler Options ->
Config and Target -> Target-specific options there is a checkbox for
"Win32 gui application (-WG)" and it is checked.

So I guess I am creating a Win32 exe as intended...


-- 
Bo Berglund
Developer in Sweden