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POOpening a Memory Mapped File causes FileNotFoundException when deployed in IIS
 

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    <p>Following the code example from <a href="http://gunnarpeipman.com/2009/06/net-framework-4-0-using-memory-mapped-files/">this</a> website, I created a windows console application that creates a mapped memory file:</p> <pre><code> using (var file = MemoryMappedFile.CreateNew("myFile", 24)) { var bytes = new byte[24]; for (var i = 0; i &lt; bytes.Length; i++) bytes[i] = (byte)(65 + i); using (var writer = file.CreateViewAccessor(0, bytes.Length)) { writer.WriteArray&lt;byte&gt;(0, bytes, 0, bytes.Length); } Console.WriteLine("Run memory mapped file reader before exit"); Console.WriteLine("Press any key to exit ..."); Console.ReadLine(); } </code></pre> <p>in a new asp.net web application I read the MMF using the code:</p> <pre><code> protected void Page_Load(object sender, EventArgs e) { string sOutput = ""; using (var file = MemoryMappedFile.OpenExisting("myFile")) { using (var reader = file.CreateViewAccessor(0, 24)) { var bytes = new byte[24]; reader.ReadArray&lt;byte&gt;(0, bytes, 0, bytes.Length); for (var i = 0; i &lt; bytes.Length; i++) sOutput += (char)bytes[i] + " "; } } Response.Write(sOutput); } </code></pre> <p>In the development IIS Express the file is read as expected and the page displays the data from the mapped memory file.</p> <p>However, When deployed to IIS I get the exception <code>System.IO.FileNotFoundException</code> at the location<code>MemoryMappedFile.OpenExisting("myFile")</code></p> <p>I tried changing the app pool identity to the same as the one running the MMF console application but this does didn't work. </p>
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    1. COWhere is myFile located?
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      1. USAkash Kava
    2. COIs the ISAPI module installed on the production IIS?
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      1. USGlenn Vandamme
    3. COIn `Page_Load` you calling `MemoryMappedFile.OpenExisting`. But do you have `MemoryMappedFile.CreateNew` method call in web application?
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      1. USYuriy Rozhovetskiy
 

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