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 DRIVExx 1.01 - Block Devices Tools   Charles B. Little 01.11.1991

DRIVExx is a collection of tools, written in Turbo Pascal v6, for dealing with block devices in a DOS environment. The tools available here will allow any Pascal programmer who uses disk I/O to gain that extra measure of control over his or her application. At the very least they will have the ability to prevent access of a phantom drive so their nice user interface won't get overwritten by non-interceptable DOS messages like "Insert a disk..." Shareware. Included: Docs, samples and TPU6.0 only :(



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(********************************************************************) (* UNIT DRIVExx *) (* *) (* Version 1.01 *) (* *) (* Copyright (C) 1991 by NativSoft Computing *) (* *) (* 1155 College Ave *) (* Adrian, MI 49221 *) (* (517) 265-6080 *) (* CIS [71160,1045] *) (* *) (* Written by: Charles B. Little, Ph.D. *) (* Version: 1.01 *) (* Revision Date: 1 November 1991 *) (* Language: Turbo Pascal v6 *) (* *) (* ALL RIGHTS RESERVED *) (* *) (********************************************************************) INTRODUCTION: DRIVExx is a collection of tools, written in Turbo Pascal v6, for dealing with block devices in a DOS environment. To the best of our knowledge, no such tools exist in any "professional" programming toolboxes, in any programming language. The tools available here will allow any Pascal programmer who uses disk I/O to gain that extra measure of control over his or her application. At the very least they will have the ability to prevent access of a phantom drive so their nice user interface won't get overwritten by non-interceptable DOS messages like "Insert a disk..." While it may not be the last word on the subject, DRIVExx works. And just about everything you'd want your applications to know about drives is available WITHOUT ACCESSING THEM! The only exceptions to hitting drives are functions DiskWasChanged and GETDPB: DiskWasChanged will hit a drive ONLY if the drive supports changeline detection, and GETDPB will hit the disk only if you tell it to. Naturally, it is perfectly safe for GETDPB to hit a removable drive that does not have a disk in it. Much of the required information is available only in undocumented DOS functions and data structures. Wherever a documented function will return the same information, however, the undocumented function is still used as a redundancy check. Indeed, the source code for DRIVExx is probably at least 50% longer than need be due to extensive interlocking redundancy checking. All of the features of DRIVExx are demonstrated in the demo program DRVDEMO.PAS. The only exception to this is function MakeActive, whose description below should make clear why it is impractical to include it in DRVDEMO. If you like it and find it useful you may distribute DRIVExx freely as long as all files in the original LZH file are distributed. Those files are: DRIVExx.TXT (this file) DRIVExx.TPU size = 20528, date = 11/1/91, time = 6:00pm DRVDEMO.PAS size = 10034, date = 11/1/91, time = 6:00pm NativSoft Computing 1155 College Ave. Adrian, MI 49221