[Lazarus] Lazarus errors -- DVD procedure identifiers.

Peter Williams pewilliams2010 at live.com
Fri Apr 8 00:22:31 CEST 2011

Hi Daniel,

Date: Thu, 7 Apr 2011 17:20:51 -0300
From: daniel.franzini at gmail.com
To: lazarus at lists.lazarus.freepascal.org
Subject: Re: [Lazarus] Lazarus errors -- DVD procedure identifiers.

>It seems that these functions and constants you are using are from Windows unit.
>Did you tried to include it in your uses clause?

I need to get this working for Linux and cross-platform compiling. Is there a Linux equivalent of these procedures?
I think that maybe I can replace "ZeroMemory" with "FillChar"... what is the syntax?
What about GetDriveType, DRIVE_CDROM and DeviceIoControl ? Also what is the syntax for the Linux versions (cross platform) of these?
Best Regards,Peter / pew
2011/4/7 Peter Williams <pewilliams2010 at live.com>

Hi All,
I have a legacy Delphi 7 project which works fine in D7, but it gives these errors in Lazarus 0.9.31.

Options changed, recompiling clean with -BHint: Start of reading config file /etc/fpc.cfg
Hint: End of reading config file /etc/fpc.cfgFree Pascal Compiler version 2.4.2-0 [2010/11/11] for i386
Copyright (c) 1993-2010 by Florian KlaempflTarget OS: Linux for i386Compiling Project1.lpr
Compiling DVDregion1.pasDVDregion1.pas(62,13) Error: Identifier not found "ZeroMemory"DVDregion1.pas(63,21) Error: Identifier not found "GetDriveType"
DVDregion1.pas(65,23) Error: Identifier not found "DRIVE_CDROM"DVDregion1.pas(76,28) Error: Identifier not found "DeviceIoControl"
DVDregion1.pas(115) Fatal: There were 4 errors compiling module, stopping   

unit DVDregion1;
{$MODE Delphi}

uses  LCLIntf, LCLType, LMessages, Classes, SysUtils, Forms, StdCtrls, Controls;

type  DVD_REGION = record    CopySystem,
      RegionData, // current media region    SystemRegion, // current drive region    ResetCount: Byte;
type  TForm1 = class(TForm)
    Memo1: TMemo;    Button1: TButton;    procedure Button1Click(Sender: TObject);
  private    { Private declarations }  public    { Public declarations }
var  Form1: TForm1;

{$R *.lfm}

procedure TForm1.Button1Click(Sender: TObject);const  drive_letter = 'H:';
  RegionStrings: array[0..8] of string = (    ' 0 --- No Region Code - works in any DVD player',    ' 1 --- United States of America, Canada',
    ' 2 --- Europe, France, Greece, Turkey, Egypt, Arabia, Japan and South Africa',    ' 3 --- Korea, Thailand, Vietnam, Borneo and Indonesia',
    ' 4 --- Australia, New Zealand, Mexico, the Caribbean, and South America',    ' 5 --- India, Africa, Russia and former USSR countries',
    ' 6 --- Peoples Republic of China',    ' 7 --- Unused',    ' 8 --- Airlines and Cruise Ships');
var  handle: THandle;  rv, Region2Check: Integer;  region: DVD_REGION;
  dw: DWORD;  status: Boolean;  Mask: byte;begin
  Memo1.Clear;  ZeroMemory(@region, SizeOf(DVD_REGION));  rv := GetDriveType(drive_letter);

  if rv = DRIVE_CDROM then    Memo1.Lines.Add('Drive is a CD/DVD drive');

  handle := FileCreate('\\.\' + drive_letter); { *Converted from CreateFile*  }

  if handle = INVALID_HANDLE_VALUE then  begin    Memo1.Lines.Add('Cannot open the drive');
    Exit;  end;
  status := DeviceIoControl(
    handle, // handle to device    IOCTL_DVD_GET_REGION, // dwIoControlCode    nil, // lpInBuffer
    0, // nInBufferSize    @region, // output buffer    SizeOf(DVD_REGION), // buffer size
    dw, // number of bytes returned    nil);
  if not status then
  begin    FileClose(handle); { *Converted from CloseHandle*  }    Memo1.Lines.Add('DevIoControl Failed');
    Exit;  end;
  Memo1.Lines.Add('The Region and Code for this DVD :');
  Memo1.Lines.Add('');  Memo1.Lines.Add('Code - Region');

  if region.RegionData and $3F = 0 then    Memo1.Lines.Add(RegionStrings[0])  else
  begin    Mask := 1;    for Region2Check := 1 to 8 do    begin
      if region.RegionData and Mask = 0 then        Memo1.Lines.Add(RegionStrings[Region2Check]);      Mask := Mask shl 1;
    end;  end;
  FileClose(handle); { *Converted from CloseHandle*  }

Best Regards,Peter E Williams




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