embedding-c-libraryexe-inside-net-assembly

[bugbit]

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;

namespace MyApplication
{
static public class NativeMethods
{
[DllImport("kernel32.dll")]
public static extern IntPtr LoadLibrary(string dllToLoad);

    [DllImport("TestLibrary.dll", 
    CallingConvention = CallingConvention.StdCall)]
    public static extern IntPtr GetString();
}

public static class CommonUtils
{
    /// <summary>
    /// Loads given unmanaged library from the assembly.
    /// This allows to embed .dll file as resource inside assembly.
    /// Example: 
    /// string tempDllPath = LoadUnmanagedLibraryFromResource( Assembly.GetExecutingAssembly(),
    ///                                                         "PInvokeTest.TestLibrary.dll", 
    ///                                                         "TestLibrary.dll");
    /// </summary>
    /// <param name="assembly"></param>
    /// <param name="libraryResourceName"></param>
    /// <param name="libraryName"></param>
    /// <returns></returns>
    public static string LoadUnmanagedLibraryFromResource(Assembly assembly, 
        string libraryResourceName, 
        string libraryName)
    {
        string tempDllPath = string.Empty;
        using (Stream s = assembly.GetManifestResourceStream(libraryResourceName))
        {
            byte[] data = new BinaryReader(s).ReadBytes((int)s.Length);

            string assemblyPath = Path.GetDirectoryName(assembly.Location);
            tempDllPath = Path.Combine(assemblyPath, libraryName);
            File.WriteAllBytes(tempDllPath, data);

        }

        NativeMethods.LoadLibrary(libraryName);
        return tempDllPath;
    }
}
class Program
{
    static void Main(string[] args)
    {
        string resourceName = "MyApplication.TestLibrary.dll";
        string libraryName = "TestLibrary.dll";

        // create and load library from the resource
        string tempDllPath = CommonUtils.LoadUnmanagedLibraryFromResource(Assembly.GetExecutingAssembly(),
            resourceName, 
            libraryName);
        // invoke native library function
        string output = System.Runtime.InteropServices.Marshal.PtrToStringAnsi(NativeMethods.GetString());

        Console.WriteLine(output);
         
    }
}

}