文件列表:

CRC32 Library (0, 2003-09-14)
CRC32 Library\CRC32.cpp (5077, 2002-01-20)
CRC32 Library\CRC32.h (589, 2002-02-01)
CRC32 Library\NAG Software Solutions.url (82, 2002-01-14)

================================================= CRC32 Library for C++Builder(tm) - Release Notes Copyright 2002 NAG Software Solutions ================================================= CONTENTS ================================================= 1. INTRODUCTION 2. GETTING STARTED 3. SEE ALSO 4. CONTACTING NAG SOFTWARE SOLUTIONS 1. INTRODUCTION =================================================== The CRC32 Library includes a module, CRC32.cpp, that you can freely include in your applications to start performing 32-bit cyclic redundancy checks in no time. By obtaining the current CRC32 image of a file and comparing it with the image obtained from the file when it was in a known untouched state, you can check whether it has been tampered with. File compression utilities such as WinZip(tm) use this method to verify the integrity of stored files, i.e., to ensure that they are not corrupt. 2. GETTING STARTED =================================================== To get started with the CRC32 Library, begin by adding the included CRC32.cpp module to the C++Builder project in which you intend to use the library. To do this, open the Project menu and click "Add to Project". Look up and select the CRC32.cpp file, then click OK. By now, the file should have been added to your project and the appropriate path should have been appended to your project's include and library search paths. Next, you must link the included CRC32.h file to the unit from which you intend to call the functions supplied by the CRC32 Library. To do this, select the "Include Unit Hdr" menu item from the File menu in the C++Builder IDE. You should now be ready to go. Remember that if you plan on accessing the library's functions from other units later on, you will have to link CRC32.h to those units as well. The CRC32 Library declares two functions. unsigned long CalculateCRC(AnsiString szFileName); Where szFileName is the name, including any necessary path information, of the file from which you wish to obtain a hexadecimal CRC32 image. The returned value is a 32-bit long integer, which you can later convert to hexadecimal text with the aid of the IntToHex function supplied by the VCL. This function loads the specified file into a stream and calls CalculateCRCFromStream to perform the actual calculation. unsigned long CalculateCRCFromStream(TFileStream *Stream); Where Stream is an existent and initialized stream containing the data from which you wish to obtain a hexadecimal CRC32 image. The returned value is a 32-bit long integer, which you can later convert to hexadecimal text with the aid of the IntToHex function supplied by the VCL. 3. SEE ALSO =================================================== Be sure to check out our other products too! AccuLock(tm), our new cutting-edge application protection component suite for Delphi and C++Builder. http://www.nagsoftware.com/products/acculock/ NAG Components(tm), the one-stop, cross-platform component suite for Delphi and C++Builder. With over 70 multi-purpose components, you will not have a reason to look anywhere else. http://www.nagsoftware.com/products/nagcomponents/ 4. CONTACTING NAG SOFTWARE SOLUTIONS =================================================== Find us on the Web http://www.nagsoftware.com/ Fax number +1 (419) 710-6721 E-mail addresses General questions and comments: sales@nagsoftware.com Bug reports: bugs@nagsoftware.com Customer support (*): support@nagsoftware.com (*) When requesting technical support, please include your name, company name (if applicable), operating system (e.g. Windows ***, etc.) and your compiler version (e.g. C++Builder 6, etc.). If you have any update packs installed, please state so in your message. Also, if you are having a problem or receiving an error code, please state it exactly. Regular mail NAG Software Solutions 3 de Febrero 1715 B1***2FHI San Isidro, Buenos Aires ARGENTINA =================================================== Copyright 2002 NAG Software Solutions All rights reserved ===================================================

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