How Many Files Can I Open Simultaneously in Visual C , and How Can I Increase This Limit?

Understanding File Handle Limits in Windows

When working with files using fopen() in Visual C , you may encounter limitations in the number of files that can be opened simultaneously. This is attributed to a limit imposed by the C run-time libraries.

Default File Handle Limit

The default maximum number of file handles that can be open concurrently in VC is 512. Attempting to exceed this limit results in program failure.

Changing the File Handle Limit

To adjust the file handle limit, you can use the _setmaxstdio function. This function allows you to specify a new maximum number of files that can be open simultaneously. For instance, the following code sets the maximum number of open files to 1024:

_setmaxstdio(1024);

Compatibility with Windows Versions

However, it's important to note that not all versions of Windows support unlimited file handle limits. You may need to verify whether your specific Windows version supports the limit you are attempting to set.

Additional Considerations

• Refer to the Microsoft documentation for _setmaxstdio for more detailed information on its usage.
• In Visual Studio 2015, the default file handle limit has been increased. More information can be found in the corresponding documentation.

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