lockfile/unlockfile,can not work between the processes?

This is a discussion on lockfile/unlockfile,can not work between the processes? within the Windows Programming forums, part of the Platform Specific Boards category; hello, I locked a file in a process ,and now to release it in another process,but it doesn't work.the GetLastError() ...

  1. #1
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    lockfile/unlockfile,can not work between the processes?

    hello,
    I locked a file in a process ,and now to release it in another process,but it doesn't work.the GetLastError() API indicates as if I never locked that file.

    how come it turned out to be like this?
    Is there any other way to do this: lockfile in one process and unlock in another?

    regards

  2. #2
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    Quote Originally Posted by wal_sug View Post
    hello,
    I locked a file in a process ,and now to release it in another process,but it doesn't work.the GetLastError() API indicates as if I never locked that file.

    how come it turned out to be like this?
    Is there any other way to do this: lockfile in one process and unlock in another?

    regards
    And why would you want to do it that way? The whole purpose of LockFile and UnlockFile is that they keep track of the process that locked the file, and prevent any other process from operating on the file. It would be pretty insecure and pointless to have a locking mechanism that doesn't check that the process unlocking the file is the same process that locked it. It reminds me of the time when Ford in the UK had a lock that just about any key would unlock and start any Ford model of that year - it wasn't exactly a publicity success (well, if you count "any publicity is good publicity", then perhaps it was!

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    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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