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ID: 24309, Using more than 3 GB memory in a 32 bit Delphi program

by Olaf Hess Email: Anonymous

A 32bit Delphi program which shows how to use up to 3.5 GB of RAM by setting the IMAGE_FILE_LARGE_ADDRESS_AWARE flag in the EXE header.
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For Delphi, Version 7.0  to 12.0 1679 downloads
Copyright: No significant restrictions

Size: 64,981 bytes
Updated on Thu, 29 Jan 2009 14:14:08 GMT
Originally uploaded on Sun, 21 Jan 2007 04:59:53 GMT
SHA1 Hash: 2B249C183DA9607715EFBCAC1163EA7689138F97
MD5 Hash: 8BAD153F6E89567585A529C36B6BCCA4

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This program demonstrates how to use up to 2.5 GB of RAM on the 32bit versions of Windows XP Prof. and Server 2003 and up to 3.5 GB of RAM on the 64bit versions of Windows XP, Vista, Server 2003 and 2008. This is accomplished by instructing the Delphi linker to set the IMAGE_FILE_LARGE_ADDRESS_AWARE flag set in the EXE header of the 32bit app.

Furthermore, the program shows how to find out whether a program runs on the 32bit or 64bit version of Windows and how to access the flags in the EXE header using API calls.

See Readme.rtf in the ZIP archive for more information.
Source code updated to work with Delphi 2009.

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