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Editorial Team
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Editorial Team
Asked: May 15, 20262026-05-15T16:35:05+00:00 2026-05-15T16:35:05+00:00

Is it allowed to mix different file handling functions in a one system e.g.

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Is it allowed to mix different file handling functions in a one system e.g.

  • fopen() from cstdio
  • open() from fstream
  • CreateFile from Win API ?

I have a large application with a lot of legacy code and it seems that all three methods are used within this code. What are potential risks and side effects ?

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  1. Editorial Team
    Editorial Team
    2026-05-15T16:35:05+00:00Added an answer on May 15, 2026 at 4:35 pm

    Yes, you can mix all of that together. It all boils down to the CreateFile call in any case.

    Of course, you can’t pass a file pointer to CloseHandle and expect it to work, nor can you expect a handle opened from CreateFile to work with fclose.

    Think of it exactly the same way you think of malloc/free vs new/delete in C++. Perfectly okay to use concurrently so long as you don’t mix them.

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