check file opened or not?

This is a discussion on check file opened or not? within the Windows Programming forums, part of the Platform Specific Boards category; Hello everyone, On Windows platform, which API could be used to check whether a file is opened (either by other ...

  1. #1
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    check file opened or not?

    Hello everyone,


    On Windows platform, which API could be used to check whether a file is opened (either by other thread or process or even the same thread) or not?

    C++ is fine.


    thanks in advance,
    George

  2. #2
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    You can try to open the file with "NO sharing", then it will fail if some other process has the file open.

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    Mats
    Compilers can produce warnings - make the compiler programmers happy: Use them!
    Please don't PM me for help - and no, I don't do help over instant messengers.

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    Thanks Mats,


    You mean ::OpenFile() with OF_SHARE_EXCLUSIVE?

    Quote Originally Posted by matsp View Post
    You can try to open the file with "NO sharing", then it will fail if some other process has the file open.

    --
    Mats

    regards,
    George

  4. #4
    C++まいる!Cをこわせ! Elysia's Avatar
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    ifstream is fine.
    Quote Originally Posted by Adak View Post
    io.h certainly IS included in some modern compilers. It is no longer part of the standard for C, but it is nevertheless, included in the very latest Pelles C versions.
    Quote Originally Posted by Salem View Post
    You mean it's included as a crutch to help ancient programmers limp along without them having to relearn too much.

    Outside of your DOS world, your header file is meaningless.
    For information on how to enable C++11 on your compiler, look here.
    よく聞くがいい!私は天才だからね! ^_^

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    Thanks Elysia,


    You mean filebuf::sh_none?

    Quote Originally Posted by Elysia View Post
    ifstream is fine.

    regards,
    George

  6. #6
    C++まいる!Cをこわせ! Elysia's Avatar
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    ifstream::open with appropriate open protection constants, which I don't know what they're called or located.
    Last edited by Elysia; 04-03-2008 at 07:18 AM.
    Quote Originally Posted by Adak View Post
    io.h certainly IS included in some modern compilers. It is no longer part of the standard for C, but it is nevertheless, included in the very latest Pelles C versions.
    Quote Originally Posted by Salem View Post
    You mean it's included as a crutch to help ancient programmers limp along without them having to relearn too much.

    Outside of your DOS world, your header file is meaningless.
    For information on how to enable C++11 on your compiler, look here.
    よく聞くがいい!私は天才だからね! ^_^

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    when you say a file do you mean a process or what , because your making it sound like a .txt file

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    Quote Originally Posted by Anddos View Post
    when you say a file do you mean a process or what , because your making it sound like a .txt file
    I think George2 is asking about files like .txt and such.

    --
    Mats
    Compilers can produce warnings - make the compiler programmers happy: Use them!
    Please don't PM me for help - and no, I don't do help over instant messengers.

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    Thanks Elysia,


    What do you mean "what they're called or located"?

    Quote Originally Posted by Elysia View Post
    which I don't know what they're called or located.

    Thanks Anddos,


    I mean data files, like .txt or something. Any ideas to my original question?

    Quote Originally Posted by Anddos View Post
    when you say a file do you mean a process or what , because your making it sound like a .txt file

    regards,
    George

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    Thanks Mats,


    Right Mats!

    Quote Originally Posted by matsp View Post
    I think George2 is asking about files like .txt and such.

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    Mats

    regards,
    George

  11. #11
    C++まいる!Cをこわせ! Elysia's Avatar
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    Quote Originally Posted by George2 View Post
    Thanks Elysia,
    What do you mean "what they're called or located"?
    I mean I don't know how to call ifstream with appropriate arguments.
    Quote Originally Posted by Adak View Post
    io.h certainly IS included in some modern compilers. It is no longer part of the standard for C, but it is nevertheless, included in the very latest Pelles C versions.
    Quote Originally Posted by Salem View Post
    You mean it's included as a crutch to help ancient programmers limp along without them having to relearn too much.

    Outside of your DOS world, your header file is meaningless.
    For information on how to enable C++11 on your compiler, look here.
    よく聞くがいい!私は天才だからね! ^_^

  12. #12
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    Thanks Elysia,


    So you mean you are not sure whether using filebuf::sh_none is correct?

    Quote Originally Posted by Elysia View Post
    I mean I don't know how to call ifstream with appropriate arguments.

    regards,
    George

  13. #13
    C++まいる!Cをこわせ! Elysia's Avatar
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    I don't know, but I doubt it. The class takes its arguments from ios_base.
    Quote Originally Posted by Adak View Post
    io.h certainly IS included in some modern compilers. It is no longer part of the standard for C, but it is nevertheless, included in the very latest Pelles C versions.
    Quote Originally Posted by Salem View Post
    You mean it's included as a crutch to help ancient programmers limp along without them having to relearn too much.

    Outside of your DOS world, your header file is meaningless.
    For information on how to enable C++11 on your compiler, look here.
    よく聞くがいい!私は天才だからね! ^_^

  14. #14
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    and to check if its open ?
    i would check if the process notepad is open then use FindWindow to check is the string of the windowtext is matching your textfile description

  15. #15
    C++まいる!Cをこわせ! Elysia's Avatar
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    George wants to find out if the file is open, not if a process is open. And this doesn't just include Notepad. What you describe is a really horrible way of doing it.
    Quote Originally Posted by Adak View Post
    io.h certainly IS included in some modern compilers. It is no longer part of the standard for C, but it is nevertheless, included in the very latest Pelles C versions.
    Quote Originally Posted by Salem View Post
    You mean it's included as a crutch to help ancient programmers limp along without them having to relearn too much.

    Outside of your DOS world, your header file is meaningless.
    For information on how to enable C++11 on your compiler, look here.
    よく聞くがいい!私は天才だからね! ^_^

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