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

[luiz americo pereira camara]

In my experince sigsegv occurs mostly when a field or variable is accessed
before initialization.

Try to set a breakpoint in dongle.initkey call. And evaluate the dongle
field (open debugger evaluate window)

Look for dongle or one of the tsentinel fields being nil

Liiz

Em 22/06/2015 05:10, "Bo Berglund" <bo.berglund at gmail.com> escreveu:
>
> 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
>
>
> --
> _______________________________________________
> Lazarus mailing list
> Lazarus at lists.lazarus.freepascal.org
> http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
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