memory-mapped-files

Please excuse me if this is a poor question as I am not good with memory mapped files. I am using memory mapped files in my project. I am tracking the files in progress and the file that has already processed in memory mapped files. I have two memory mapped files. In the first memory mapped file, I keep track of processed files and in the second memory mapped file, I keep track of files under processing. So when the processing is complete on a particular file, I make an entry in the first memory mapped file and remove the entry from the second mapped file. Now the problem is that, if all the

I need to transfer some data - char buffer[100000]; - to a child process which is started by me. Right now I'm using an ordinary file to do so, the parent process writes the data to a file on disk, and the child process reads it from disk and deletes the file. However, that causes unnecessary writes to the disk, so I want to use memory-mapped files instead. How do I create, write to, and then read from a memory-mapped file in such a way that no data is written to disk, except when the pagefile or swap file is used? Edit: I forgot to specify that I want to use raw WINAPI functions, so the code

I understand how to create a memory mapped file, but my question is let's say that in the following line: FileChannel roChannel = new RandomAccessFile(file, "r").getChannel(); ByteBuffer roBuf = roChannel.map(FileChannel.MapMode.READ_ONLY, 0, SIZE); Where i set SIZE to be 2MB for example, does this means that it will only load 2MB of the file or will it read further in the file and update the buffer as i consume bytes from it? Where i set SIZE to be 2MB for example, does this means that it will only load 2MB of the file or will it read further in the file and update the buffer as i consume

I have an image in D Drive like "D:\Image\1.tiff". I want to read this file and write it in an another location, for example in the path "D:\Project\". How to do this using Memory Mapped File? The CreateFromFile methods create a memory-mapped file from an existing file on disk. The following example creates a memory-mapped view of a part of an extremely large file and manipulates a portion of it. using System; using System.IO; using System.IO.MemoryMappedFiles; using System.Runtime.InteropServices; class Program { static void Main(string[] args) { long offset = 0x10000000; // 256 megabytes

My understanding of how memory mapped files work in C# is that every request for data results in a copy. For instance, if you had a large data structure persisted as a file, using a memory mapped file would result in memory for the actual file mapped into RAM, and a copy residing in a GC heap once it was read from the file. I'm assuming this is because pointers and the GC don't get along well together generally speaking. So, is there any way around this? Perhaps via some mixed mode C++ that can expose a managed API over the memory mapped data? What about direct pointer manipulation with unsafe

I recently came across this article which provided a nice intro to memory mapped files and how it can be shared between two processes. Here is the code for a process that reads in the file: import java.io.File; import java.io.FileNotFoundException; import java.io.IOException; import java.io.RandomAccessFile; import java.nio.MappedByteBuffer; import java.nio.channels.FileChannel; public class MemoryMapReader { /** * @param args * @throws IOException * @throws FileNotFoundException * @throws InterruptedException */ public static void main(String[] args) throws FileNotFoundException, IOException,