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Memory mapped file cannot be closed without un-mapping, since it's still referenced


Memory mapped file cannot be closed without un-mapping, since it's still referenced

By : Levi Cooke
Date : November 20 2020, 03:01 PM
hope this fix your issue POSIX requires that there's a reference to mmap'ed file even after a close.
code :


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Read all contents of memory mapped file or Memory Mapped View Accessor without knowing the size of it

Read all contents of memory mapped file or Memory Mapped View Accessor without knowing the size of it


By : Kumar Janu
Date : March 29 2020, 07:55 AM
Hope that helps I need something similar to ReadToEnd or ReadAllBytes to read all of the contents of the MemoryMappedFile using the MappedViewAccessor if I don't know the size of it, how can I do it? , Rather use the Stream:
code :
public static Byte[] ReadMMFAllBytes(string fileName)
{
    using (var mmf = MemoryMappedFile.OpenExisting(fileName))
    {
        using (var stream = mmf.CreateViewStream())
        {
            using (BinaryReader binReader = new BinaryReader(stream))
            {
                return binReader.ReadBytes((int)stream.Length);
            }
        }
    }
}
What is the insertion order if I have two memory-mapped buffers mapped to the same file?

What is the insertion order if I have two memory-mapped buffers mapped to the same file?


By : user2179146
Date : March 29 2020, 07:55 AM
wish help you to fix your issue I haven't tested any of this, so I don't know.
But, frankly, there's no guarantee on any of this ordering.
Writing to a memory mapped text file printing NULL till the end of mapped memory

Writing to a memory mapped text file printing NULL till the end of mapped memory


By : Frankie
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further first of all CreateFileMapping and MapViewOfFile this is bad solution for log file. you need create/open file with FILE_APPEND_DATA access instead GENERIC_READ | GENERIC_WRITE - so call must look like:
code :
HANDLE log_file = CreateFileW(L"one.txt", 
    FILE_APPEND_DATA,
    FILE_SHARE_WRITE|FILE_SHARE_READ,     
    NULL,
    OPEN_ALWAYS,                 
    FILE_ATTRIBUTE_NORMAL,   
    NULL);
Memory Mapped Files, Managed Mapped File and Offset Pointer

Memory Mapped Files, Managed Mapped File and Offset Pointer


By : J Cap
Date : March 29 2020, 07:55 AM
this one helps. You can use the managed_mapped_file to transparently allocate from a memory mapped file.
This means that for all practical purposes you often don't need to dubdivide your memory areas. It's all virtual memory anyways, so paging takes care of loading the right bits at the required times.
Writing to memory mapped file is slower than non-memory mapped file

Writing to memory mapped file is slower than non-memory mapped file


By : Pythonrexy
Date : March 29 2020, 07:55 AM
this one helps. From the SDK documentation:
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