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CreateFileMapping always returns ERROR_ALREADY_EXISTS

Discussion in 'Win32' started by timr, Oct 1, 2006.

  1. timr

    timr New Member

    Oct 1, 2006
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    I'm debugging problem with an application that memory maps a file for use as an inter process comm buffer. The call


    always returns successful with a handle, but when I call GetLastError() it identifies the file as already existing. This occurs even after a reboot of the computer. The trouble is, the memory size of the returned handle's object is limited to 4096 bytes, not the SHARED_MEM_SIZE specified in the call (which is 32k). So when the file is mapped, any access beyond 4096 bytes causes a crash/exception.

    The functional calls worked for quite a few months before this problem appeared. Some users of this application (though not many) also report a problem that I believe is directly associated with this issue.

    Does anyone know about this type of issue? . Is there a way of forcing the memory mapped file to be deleted or purged before starting the application? Can you find all open handles given the memory mapped name?


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