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How can one open more than 1000 files simultaneously in Windows 7 and Windows 8?
Please let me know the API or the process by which one can achieve this.

Regards,
Satendra
Posted 14-Aug-12 6:00am
Updated 14-Aug-12 6:22am
v2
Comments
Wes Aday 14-Aug-12 12:03pm
   
I highly doubt that you need 1000 files open at the same time. You have a serious design flaw.
Yvan Rodrigues 14-Aug-12 12:21pm
   
I agree, but I'm interested if it's possible.
Sergey Alexandrovich Kryukov 14-Aug-12 15:46pm
   
Did you try it? Failed? If there is a limitation, it's a limitation, why breaking through it?
--SA
Sergey Alexandrovich Kryukov 14-Aug-12 15:45pm
   
Exactly.
--SA
Richard MacCutchan 14-Aug-12 13:26pm
   
Please let me know the API or the process by which one can achieve this.

It's called a loop.
Nish Sivakumar 14-Aug-12 13:36pm
   
--- It's called a loop.

Come now, Richard. Poor comment given the OP's requirement.

1 solution

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Solution 1

The C runtime has a default limit of 512 open file handles. Considering that parts of .NET are written using the CRT, I assume the same limit holds there too. You may have to P/Invoke _setmaxstdio if you want to increase this limit.
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satendra K 14-Aug-12 13:33pm
   
_setmaxstdio(1000); I tried this api,and it is returning success i.e. it is able to increase the limit. i cross checked using _getmaxstdio(). but actually i am trying to open files using "fopen". when fopen is trying to open more than 512 files fopen is failing.
In some portals i have read that _setmaxstdio is not working in win7.Could you please suggest me other way. i am using c/c++ environment.
Nish Sivakumar 14-Aug-12 13:46pm
   
I just verified that it works as expected in Windows 7 64 bit using VC++ 2010.
Sergey Alexandrovich Kryukov 14-Aug-12 15:47pm
   
My 5.
--SA
Albert Holguin 14-Aug-12 20:27pm
   
+5... although not completely sure why you'd ever want to do something like this...

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