What's the Limit on Simultaneously Opened Files in VC , and How Can I Change It?

Exploring File Handling Limits in Windows

Question:

In VC , fopen() is causing file opening failures. Is there a limit to the number of files that can be opened concurrently?

Answer:

Yes, the C run-time libraries impose a limit of 512 open files simultaneously. Exceeding this limit leads to program failure.

Solution:

To adjust this limit, use the _setmaxstdio function. Refer to the following resources for further details:

• _setmaxstdio function: https://docs.microsoft.com/en-us/cpp/c-runtime-library/reference/setmaxstdio?view=vs-2019
• Windows support for upper file limits: https://docs.microsoft.com/en-us/windows/win32/winprog/maximum-file-size-limits
• _setmaxstdio in VS 2015: https://docs.microsoft.com/en-us/cpp/visual-studio/setmaxstdio-and-max-file-handles?view=vs-2019

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