C# equivalent of Java Memory mapping methods

Question

While translating a Java project to C#, i got stuck with the following piece:

RandomAccessFile raf = new RandomAccessFile(fileName, "r");
FileChannel channel = raf.getChannel();
MappedByteBuffer buffer = channel.map(FileChannel.MapMode.READ_ONLY, 0, length);

I'm not familiar with the memory mapping conception, I found a MemoryMappedFile class in C#, but don't know how to use it properly like in the Java code above (the MappedByteBuffer is used to obtain a large binary file, about 600-700MB).

Can anyone tell me how to translate the piece above properly?

MSDN to the recue: msdn.microsoft.com/en-us/library/vstudio/… — Oscar
– Oscar, Commented Jun 8, 2015 at 18:06

plinth · Accepted Answer · 2015-06-08 18:07:20Z

1

MemoryMappedFile mmf = MemoryMappedFile.CreateFromFile(fileName, FileMode.Read);
using (MemoryMappedViewStream vs = mmf.CreateViewStream()) {
    // perform stream operations
}

A MemoryMappedViewStream is a thin veneer onto the memory.

answered Jun 8, 2015 at 18:07

plinth

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1 Comment

remote32 Over a year ago

Thanks, but how do I write a buffer to a file then (with FileMode.Create, of course)? For example I have a function packPrunTable(table, buffer, FILE_SIZE), and I want the buffer to be mapped to file?

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