file mapping using pure c++

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3.00/5 (1 vote)

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can I implement a mechanism like "windows file mapping" in which you can treat large files on disk as if they're already loaded while they're not?

Posted 31-Oct-11 9:03am

Joseph Marzbani

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Nish Nishant · Accepted Answer · 2011-10-31T09:04:00

Solution 1

Do you mean memory mapped files? If so, see http://msdn.microsoft.com/en-us/library/dd997372.aspx[^]

If you mean direct disk access, you can use CreateFile to do that. You may run into access restrictions on Vista/Windows 7 though.

Posted 31-Oct-11 9:04am

Nish Nishant

Updated 31-Oct-11 9:10am

v3

Comments

Joseph Marzbani 31-Oct-11 15:08pm

yes I do. but that is a windows approach while I intend a "portable C++ approach".

Nish Nishant 31-Oct-11 15:11pm

There is no portable approach to these things, since C++ is agnostic of the file system (mostly).

Espen Harlinn 31-Oct-11 15:30pm

5'ed, true as far as the os and standard c/c++ libraries are concerned

Nish Nishant 31-Oct-11 15:31pm

Thanks.

Espen Harlinn · Accepted Answer · 2011-10-31T09:28:00

Solution 2

Have a look at the ACE C++ library[^]:
http://www.dre.vanderbilt.edu/Doxygen/5.5/html/ace/classACE__Mem__Map.html[^]

ACE is efficient and exceptionally well tested :)

It's also available for most relevant operating systems and compilers ...

Best regards
Espen Harlinn

Posted 31-Oct-11 9:28am

Espen Harlinn

Updated 31-Oct-11 9:29am

v2

Comments

Nish Nishant 31-Oct-11 15:32pm

Interesting link - had not heard of that before. Voted 5!

Espen Harlinn 31-Oct-11 16:18pm

Thank you, Nish - I've written a real-time data historian on top of ACE, and I've always been very happy with both the library and the community.

file mapping using pure c++

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