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Asked: 2026-05-15T01:40:38+00:00

I have a code in Visual Studio 2008 in C++ that works with files

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I have a code in Visual Studio 2008 in C++ that works with files just by fopen and fclose.
Everything works perfect in Debug mode. and I have tested with several datasets.
But it doesn’t work in release mode. It crashes all the time.
I have turned off all the optimizations, also there is no dependency to anything(in the linker), and also I have set these:

Optimization: Disabled(/Od)
Keep Unreferenced Data.
Do Not Remove Redundant
Optimize for Windows98: NO

I still keep wondering how it should not work under these circumstances.
What else should I turn off to let it work as in debug mode?

I think if it works in release mode but not in debug mode, it might be a coding fault but the other way looks weird. isn’t it?

I appreciate any help.
–Nima

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1 Answer

  1. Editorial Team

    Debug modes often initialize heap data allocations. The program might be dependent on this behavior. Look for variables and buffers that are not getting initialized.

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