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using System;
using System.Collections.Generic;
using System.IO;
using System.Reflection;
using Python.Runtime;
namespace Python.Runtime
{
/// <summary>
/// Example of Embedding Python inside of a .NET program.
/// </summary>
/// <remarks>
/// It has similar functionality to doing `import clr` from within Python, but this does it
/// the other way around; That is, it loads Python inside of .NET program.
/// See https://github.com/pythonnet/pythonnet/issues/358 for more info.
/// </remarks>
public sealed class PythonConsole
{
#if NET40
private static AssemblyLoader assemblyLoader = new AssemblyLoader();
#endif
private PythonConsole()
{
}
[STAThread]
public static int Main(string[] args)
{
// Only .NET Framework is capable to safely inject python.runtime.dll into resources.
#if NET40
// reference the static assemblyLoader to stop it being optimized away
AssemblyLoader a = assemblyLoader;
#endif
string[] cmd = Environment.GetCommandLineArgs();
PythonEngine.Initialize();
int i = Runtime.Py_Main(cmd.Length, cmd);
PythonEngine.Shutdown();
return i;
}
#if NET40
// Register a callback function to load embedded assemblies.
// (Python.Runtime.dll is included as a resource)
private sealed class AssemblyLoader
{
private Dictionary<string, Assembly> loadedAssemblies;
public AssemblyLoader()
{
loadedAssemblies = new Dictionary<string, Assembly>();
AppDomain.CurrentDomain.AssemblyResolve += (sender, args) =>
{
string shortName = args.Name.Split(',')[0];
string resourceName = $"{shortName}.dll";
if (loadedAssemblies.ContainsKey(resourceName))
{
return loadedAssemblies[resourceName];
}
// looks for the assembly from the resources and load it
using (Stream stream = Assembly.GetExecutingAssembly().GetManifestResourceStream(resourceName))
{
if (stream != null)
{
var assemblyData = new byte[stream.Length];
stream.Read(assemblyData, 0, assemblyData.Length);
Assembly assembly = Assembly.Load(assemblyData);
loadedAssemblies[resourceName] = assembly;
return assembly;
}
}
return null;
};
}
}
#endif
}
}