Is There a Limit to the Number of Files You Can Open Simultaneously in Windows?

Limits on Open Files in Windows

When working with C run-time libraries in VC , programmers might encounter issues while opening multiple files using fopen(). This raises the question: is there a cap on the number of files that can be open concurrently in Windows?

Answer:

Yes, the C run-time libraries impose a default limit of 512 on the number of files that can be opened simultaneously. If attempts are made to exceed this limit, the program will experience failure.

To modify this limit, programmers can employ the _setmaxstdio function. This allows them to specify the maximum number of file descriptors or file streams that the application can have open at any given time. Details regarding _setmaxstdio can be found here.

It's crucial to note that not all versions of Windows support arbitrary upper limits set by _setmaxstdio. Therefore, it's recommended to consult the documentation for your specific Windows version. Additional information on _setmaxstdio can be found here.

For Microsoft Visual Studio 2015 users, relevant information on this topic can be found here.

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