Solved

Read sector(s) from floppy

Posted on 1998-11-12
6
1,531 Views
Last Modified: 2012-05-04
Hi, I want to read a floppy sector-by-sector.

E.G.
...
  asm
    mov ah, 02h   //function 2 : read sector
    mov dl, 00h    //first drive A:
    mov dh, 00h  //head 0
    mov ch, 00h  //track 0
    mov cl, 01h   //sector 1
    mov al, 01h   //read 1 sector
    mov es, SEG buff  //segment address of buffer
    mov bx, OFFSET buff  //offset address of buffer
    int 13h      //read sector with interrupt 13
  end;
...

But, "SEG" is not available in Delphi2,
so what do I do then???
0
Comment
Question by:8BEE
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
6 Comments
 
LVL 20

Expert Comment

by:Madshi
ID: 1346643
This won't work with 32bit windows. You'll have to use CreateFile and DeviceIOControl instead. Please look in the win32 help file for a topic called "Calling DeviceIOControl on Windows 95" or "Using DeviceIOControl...".

Sorry, have no sources available at this moment...   :-(

Regards, Madshi.
0
 
LVL 17

Expert Comment

by:inthe
ID: 1346644
Hello
Here is a demo from dejanews  
It shows how to change the serial numberof a floppy disk using deviceiocontrol. it may be of assistance if only to help you understand how to use deviceiocontrol

InThe

USE IT AT YOUR OWN RISK!!!

unit Unit1;
interface
uses
  Windows, Messages, SysUtils, Classes, Graphics,
  Controls, Forms, Dialogs, StdCtrls, ComCtrls;type  TForm1 = class(TForm)
    Button1: TButton;    procedure Button1Click(Sender: TObject);  private
    { Private-Deklarationen }  public    { Public-Deklarationen }  end;var
  Form1: TForm1;const  VWin32_DIOC_DOS_Int25 = 2; // direkter Lesezugriff
                                              // direct read access
  VWin32_DIOC_DOS_Int26 = 3; // direkter Schreibzugriff
                                              // direct write accesstype
  TDevIoCtl_Reg = packed Record  Reg_EBX   : DWord;  Reg_EDX   : DWord;
  Reg_ECX   : DWord;  Reg_EAX   : DWord;  Reg_EDI   : DWord;  Reg_ESI   : DWord;
  Reg_Flags : DWord;end;type  TDiskIO = packed record  StartSektor    : DWord;
  AnzahlSektoren : Word;  PBuffer        : DWord;end;implementation{$R *.DFM}
// Bootsektor lesen, Seriennummer ändern und// Bootsektor zurückschreiben
// read boot sector, change serial number, and// write boot sector back
procedure TForm1.Button1Click(Sender: TObject);var  DevIoHandle   : THandle;
  BytesReturned : DWord;  Reg           : TDevIoCtl_Reg;
  DiskIO        : TDiskIO;
  DatenBuffer   : Array [0..511] of Byte;   //  = 512 Bytes
  // Die Sektorgröße kann man mit GetDiskFreeSpace ermitteln
  // (normalerweise = 512 Bytes, bei CD-ROMs = 2048 Bytes).
  // The size of one sector can be found out with GetDiskFreeSpace
  // (normaly = 512 bytes, CD-ROMs = 2048 bytes).begin
  // DiskIO und Reg initialisieren  // initialize DiskIO and Reg  with DiskIO do
    begin      StartSektor := 0;          // ab Sektor 0 / from sector 0
      AnzahlSektoren := 1;       // 1 Sektor lesen / read 1 sector
      PBuffer := DWord(@DatenBuffer);    end;  with Reg do    begin
      reg_EAX := 0;              // Laufwerk: / drive: 0 = A, 1 = B usw.
      reg_EBX := DWord(@DiskIO);
      reg_ECX := $FFFF;          // benutze / use DiskIO    end;
  // Handle für DeviceIoControl holen.  // retrieve handle for DeviceIoControl
  DevIoHandle := CreateFile(                 '\\.\vwin32',
                 Generic_Read,
                 File_Share_Read or File_Share_Write,                 nil,
                 Open_Existing,                 File_Attribute_Normal,
                 0);  // Nur weiter, wenn Handle gültig ist.
  // only proceed, if handle is valid
  if DevIoHandle <> Invalid_Handle_Value then    begin
      // direkter Lesezugriff      // direct read access
      DeviceIoControl(DevIoHandle,                      VWin32_DIOC_DOS_Int25,
                      @Reg,                      SizeOf(Reg),
                      @Reg,                      SizeOf(Reg),
                      BytesReturned,                      nil);
      // neue Seriennummer = $12345678      // new serial number = $12345678
      DatenBuffer[39] := $78;      DatenBuffer[40] := $56;
      DatenBuffer[41] := $34;      DatenBuffer[42] := $12;
      // direkter Schreibzugriff      // direct write access
      DeviceIoControl(DevIoHandle,                      VWin32_DIOC_DOS_Int26,
                      @Reg,                      SizeOf(Reg),
                      @Reg,                      SizeOf(Reg),
                      BytesReturned,                      nil);
      // Handle freigeben      // release handle      CloseHandle(DevIoHandle);
    end;end;end.

0
 
LVL 17

Expert Comment

by:inthe
ID: 1346645
ps..sorry that's such a bloody mess:-)
0
Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 

Expert Comment

by:skatan_187
ID: 1346646
I am looking for a function that reads a disk until there is an error and then give the sector
as result .. So actually I am looking for the same stuff you are looking for. If I find something
i'll inform you about it ;-)

SkAtAn
0
 
LVL 4

Accepted Solution

by:
dwwang earned 200 total points
ID: 1346647
This is a new component that can read sectors from any disk:

http://vcl.vclxx.com/DELPHI/D32FREE/DIO.ZIP

download and have a try.
0
 
LVL 4

Expert Comment

by:dwwang
ID: 1346648
Hi, any progress?
0

Featured Post

Free Tool: SSL Checker

Scans your site and returns information about your SSL implementation and certificate. Helpful for debugging and validating your SSL configuration.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Tembedded WB animatid gifs not animated on some pcs 2 94
Dev express lookupcombo 3 64
Delphi Seattle StructureView color 1 33
Typecasting TBytes to Integer in Delphi XE8 2 63
This article explains how to create forms/units independent of other forms/units object names in a delphi project. Have you ever created a form for user input in a Delphi project and then had the need to have that same form in a other Delphi proj…
Objective: - This article will help user in how to convert their numeric value become words. How to use 1. You can copy this code in your Unit as function 2. than you can perform your function by type this code The Code   (CODE) The Im…
This video shows how to use Hyena, from SystemTools Software, to update 100 user accounts from an external text file. View in 1080p for best video quality.

732 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question