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POProgrammatically change the location of an unmanaged DLL to import
 

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  1. POProgrammatically change the location of an unmanaged DLL to import
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    <blockquote> <p><strong>Possible Duplicate:</strong><br> <a href="https://stackoverflow.com/questions/10044511/how-to-separate-managed-and-unmanaged-dlls-in-another-directory">How to separate managed and unmanaged DLLs in another directory</a> </p> </blockquote> <p>I am using unmanaged code with my C# managed code. I have the unmanaged DLL embedded in the executable of the application. In order to make this work I extract the resource/DLL to a file before I make any calls to the DLLs methods.</p> <pre><code>public static class ResourceExtractor { public static void ExtractResourceToFile(string resourceName, string filename) { if (!System.IO.File.Exists(filename)) using (System.IO.Stream s = System.Reflection.Assembly.GetExecutingAssembly().GetManifestResourceStream(resourceName)) using (System.IO.FileStream fs = new System.IO.FileStream(filename, System.IO.FileMode.Create)) { byte[] b = new byte[s.Length]; s.Read(b, 0, b.Length); fs.Write(b, 0, b.Length); } } } </code></pre> <p>So that before I make calls to the DLL I make sure to do the following:</p> <pre><code>ResourceExtractor.ExtractResourceToFile("Namespace.dll_name.dll", "dll_name.dll"); </code></pre> <p>And to wrap the methods of the unmanaged DLL I have...</p> <pre><code>public class DLLWrapper { public const string dllPath = "dll_name.dll"; [DllImport(dllPath)] public static extern uint functionA(); [DllImport(dllPath)] public static extern uint functionB(); [DllImport(dllPath)] public static extern uint functionC(); } </code></pre> <p><strong>Now for the question...</strong></p> <p>This all works. What I <strong><em>DO NOT</em></strong> like is that it creates the DLL sitting next to the executable. I would much rather create the DLL in a temporary directory and load it from there. Something like...</p> <pre><code>string tempDLLname = Path.GetTempFileName(); ResourceExtractor.ExtractResourceToFile("Namespace.dll_name.dll", tempDLLname ); DLLWrapper.dllPath = tempDLLname; ... public class DLLWrapper { public static string dllPath; [DllImport(dllPath)] public static extern uint functionA(); [DllImport(dllPath)] public static extern uint functionB(); [DllImport(dllPath)] public static extern uint functionC(); } </code></pre> <p>However this does not work because <code>[DllImport(path)]</code> requires the path to be a <code>const</code>. So how do you change the location that you want to load the DLL from? I won't know until runtime.</p>
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