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ID: 13904, CRC-32 FileCheck

by Earl F. Glynn Email: efg2@efg2.com


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For Delphi, Version 3.0  to 5.0 1420 downloads
Copyright: Commercial use requires permission


Size: 199,174 bytes
Updated on Wed, 08 Sep 1999 00:00:00 GMT
Originally uploaded on Wed, 08 Sep 1999 00:00:00 GMT
SHA1 Hash: 02AFA66A43FD6BF15D922F57A33E2384F14682AD
MD5 Hash: 4F17EAA61220173F369B5279368EF22E

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Description
This program shows how to compute CRC-32s for one or more files and to form a "metaCRC" based on an ordered sequence of files for a directory or volume. The integrity of files processed through a "scan" operation can be checked at any later time in a "verify" operation by saving a file containing the observed CRC values.

For additional details see the "Lab Report" at
http://www.efg2.com/Lab/Mathematics/FileCheck.htm

Also see the CRC Calculator, ID 13772, or
http://www.efg2.com/Lab/Mathematics/CRC.htm

Keywords:
cyclic redundancy check, CRC-32, Lookup Table, MetaCRC, CalcCRC32, CalcFileCrc32, Stream I/O, TMemoryStream, BlockRead, WmDeviceChange message, DBT.H, FindFirst/FindNext/FindClose, TSearchRec, TStringList, Sort, StrIComp, Int64, Comp, IntToHex, FormatFloat, FormatDateTime, Format, GetVolumeInformation, Volume Serial Number, Volume Label, TTabSheet, TDriveComboBox, TDirectoryListBox, TFileListBox, procedure variables, calling protected methods, tokens

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