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Copy pathPythonConnection.cs
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479 lines (425 loc) · 17.5 KB
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using System.Collections.Generic;
using System.Runtime.InteropServices;
using System.Windows.Forms;
using System.IO; // we need IO for file path manipulations
using Python.Runtime; // this is the .NET wrapper for python
namespace PythonInterface
{
public class PythonException : System.ApplicationException
{
public PythonException() { }
public PythonException(string message) { }
public PythonException(string message, System.Exception inner) { }
// Constructor needed for serialization
// when exception propagates from a remoting server to the client.
protected PythonException(System.Runtime.Serialization.SerializationInfo info,
System.Runtime.Serialization.StreamingContext context)
{ }
}
public class PythonConnection
{
/// <summary>
/// The path to the base directory of a full python distribution (e.g. WinPython).
/// This is static as one process can only obtain one embedded python interpreter.
/// </summary>
/// <param name="PyHome"></param>
static string PythonHome;
/// <summary>
/// The main modules which are loaded after initialization of the interpeter.
/// </summary>
static dynamic Main = null;
/// <summary>
/// Additional paths which are searched for modules.
/// </summary>
private List<string> AdditionalPaths = new List<string>();
/// <summary>
/// The whole paths which are searched for modules.
/// </summary>
private List<string> Pythonpath;
/// <summary>
/// The local and global dictionaries are stacks. In that way you can switch between the environments
/// transparantly. However, currently only local changing is allowed.
/// </summary>
private Stack<PyDict> Locals = new Stack<PyDict>();
private Stack<PyDict> Globals = new Stack<PyDict>();
/// <summary>
/// The reference to the numpy package if it is loaded.
/// </summary>
dynamic np = null;
/// <summary>
/// The reference to the scipy package if it is loaded.
/// </summary>
dynamic scipy = null;
/// <summary>
/// The reference to the sys package.
/// </summary>
dynamic sys = null;
/// <summary>
/// Signals if the numpy package is loaded.
/// </summary>
public bool NumpyLoaded = false;
/// <summary>
/// Signals if the scipy package is loaded.
/// </summary>
public bool ScipyLoaded = false;
public bool MatplotlibLoaded = false;
/// <summary>
/// Initializes a python connection. If you leave the parameter empty you have to set the environment
/// variable WINPYTHON.
/// </summary>
/// <param name="path">The location of the python home folder of a full python distribution (including numpy, maptlotlib, etc.)</param>
public PythonConnection(string path="")
{
if (!PythonEngine.IsInitialized)
{
if (path == "")
{
PythonHome = System.Environment.GetEnvironmentVariable("WINPYTHON", System.EnvironmentVariableTarget.Machine);
if (PythonHome == null)
PythonHome = System.Environment.GetEnvironmentVariable("WINPYTHON", System.EnvironmentVariableTarget.User);
if (PythonHome == null)
PythonHome = System.Environment.GetEnvironmentVariable("WINPYTHON", System.EnvironmentVariableTarget.Process);
if (PythonHome == null)
PythonHome = "";
}
else
{
PythonHome = path;
}
BuildPythonpath(false);
System.Environment.SetEnvironmentVariable("PYTHONPATH", string.Join(";", Pythonpath));
PythonEngine.PythonHome = PythonHome;
PythonEngine.ProgramName = "PythonRuntime";
PythonEngine.Initialize();
PythonEngine.BeginAllowThreads();
}
using (Py.GIL())
{
if (Main == null)
Main = Py.Import("__main__");
Globals.Push(new PyDict(Main.GetAttr("__dict__")));
Locals.Push(new PyDict());
sys = Import("sys");
Import("copy");
Import("io");
Import("gc");
}
}
//~PythonConnection() {
// PythonEngine.Shutdown();
//}
public PyDict Local
{
get {
return Locals.Peek();
}
}
private PyDict Global
{
get
{
return Globals.Peek();
}
}
/// <summary>
/// Allows to set variables in the python context. Allowed types are simple types (int, double, string, etc.) and
/// arrays of those types.
/// Numpy must be loaded before trying to pass arrays!
///
/// TODO: Implement Marshal.Copy for input of arrays...
/// </summary>
/// <param name="name"></param>
/// <param name="content"></param>
public void Set(string name, dynamic content)
{
using (Py.GIL())
{
System.Type ValueType = content.GetType();
// Arrays are always converted to python lists
if (ValueType.IsArray)
{
if (!NumpyLoaded)
{
throw new PythonException("numpy must be loaded for array conversion.");
}
// BlockCopy possibly multidimensional array of arbitrary type to onedimensional byte array
System.Type ElementType = ValueType.GetElementType();
int nbytes = content.Length * Marshal.SizeOf(ElementType);
byte[] data = new byte[nbytes];
System.Buffer.BlockCopy(content, 0, data, 0, nbytes);
// Create an python tuple with the dimensions of the input array
PyObject[] lengths = new PyObject[content.Rank];
for (int i = 0; i < content.Rank; i++)
lengths[i] = new PyInt(content.GetLength(i));
PyTuple shape = new PyTuple(lengths);
// Create an empty numpy array in correct shape and datatype
dynamic dtype;
if (ElementType == typeof(int))
dtype = np.int32;
else if (ElementType == typeof(double))
dtype = np.float64;
else
throw new System.Exception("Datatype not supported!");
dynamic pydata = np.empty(shape, dtype);
// Copy the data to that array
System.IntPtr ptr = (System.IntPtr)PyInt.AsInt(pydata.__array_interface__["data"][0]).ToInt32();
Marshal.Copy(data, 0, ptr, nbytes);
// Push the variable to local dictionary
UpdateLocals(name, pydata);
}
else
{
if (ValueType == typeof(int))
UpdateLocals(name, new PyInt(content));
else if (ValueType == typeof(string))
UpdateLocals(name, new PyString(content));
else if (ValueType == typeof(double))
UpdateLocals(name, new PyFloat(content));
else if (ValueType == typeof(bool))
{
UpdateLocals(name, new PyInt(System.Convert.ToInt32(content)));
RunStringTry(name + " = (" + name + " == 1)");
}
else
throw new PythonException("Datatype not supported!");
}
}
}
public dynamic Get(string name_in)
{
using (Py.GIL())
{
dynamic result;
string name = name_in;
RunString("__" + name + "__type = str(type(" + name + "))");
string type = (string)Local.GetItem("__" + name + "__type").AsManagedObject(typeof(string));
if (type == "<class 'numpy.ndarray'>")
{
// If the array is not contiguous in memory, copy it first.
// This overwrites the array (but obviously the contents stay the same).
RunString(
"if (" + name + ".__array_interface__['strides'] is not None):\n" +
" " + name + " = copy.deepcopy(" + name + ")"
);
RunString("__" + name + "__ptr = " + name + ".__array_interface__['data'][0]");
RunString("__" + name + "__nbytes = " + name + ".nbytes");
RunString("__" + name + "__shape = " + name + ".shape");
RunString("__" + name + "__dtype = str(" + name + ".dtype)");
System.IntPtr ptr = (System.IntPtr)PyInt.AsInt(Local.GetItem("__" + name + "__ptr")).ToInt32();
int nbytes = PyInt.AsInt(Local.GetItem("__" + name + "__nbytes")).ToInt32();
string dtype = (string)Local.GetItem("__" + name + "__dtype").AsManagedObject(typeof(string));
long[] shape = (long[])Local.GetItem("__" + name + "__shape").AsManagedObject(typeof(long[]));
byte[] data = new byte[nbytes];
Marshal.Copy(ptr, data, 0, nbytes);
System.Type result_type;
if (dtype == "float64")
result_type = typeof(double);
else if (dtype == "int32")
result_type = typeof(int);
else if (dtype == "int64")
result_type = typeof(long);
else if (dtype == "uint8")
result_type = typeof(byte);
else
throw new PythonException("type not supported!");
result = System.Array.CreateInstance(result_type, shape);
System.Buffer.BlockCopy(data, 0, result, 0, nbytes);
RunString("del __" + name + "__ptr");
RunString("del __" + name + "__nbytes");
RunString("del __" + name + "__dtype");
RunString("del __" + name + "__shape");
}
else
{
System.Type result_type;
if (type == "<class 'float'>")
result_type = typeof(double);
else if (type == "<class 'str'>")
result_type = typeof(string);
else if (type == "<class 'int'>")
result_type = typeof(long); // on a 64bit-system just "int" does not work!
else
throw new PythonException("type not supported!");
result = Local.GetItem(name).AsManagedObject(result_type);
}
RunString("del __" + name + "__type");
return result;
}
}
private PyList ArrayToPyList(dynamic arr)
{
using (Py.GIL())
{
System.Type NestedType = arr.GetType().GetElementType();
PyList res = new PyList();
if (NestedType == typeof(int))
{
foreach (int d in arr)
{
res.Append(d.ToPython());
}
}
else if (NestedType == typeof(double))
{
foreach (double d in arr)
{
res.Append(d.ToPython());
}
}
else
{
throw new PythonException("Nested Datatype not supported!");
}
return res;
}
}
public void ClearLocals()
{
using (Py.GIL())
Local.Clear();
}
public string[] GetLocalNames()
{
using (Py.GIL())
{
List<string> keys = new List<string>();
foreach (PyObject k in Local.Keys())
{
keys.Add((string)k.AsManagedObject(typeof(string)));
}
return keys.ToArray();
}
}
private void UpdateLocals(string name, dynamic item)
{
using (Py.GIL())
{
PyDict update = new PyDict();
update.SetItem(name, item);
Local.Update(update);
}
}
public void RunString(string code)
{
using (Py.GIL()) {
PyObject ret = PythonEngine.RunString(code, Global.Handle, Local.Handle);
if (ret == null) {
throw new PythonException("The following code produced an exception: " + code);
}
}
}
public bool RunStringTry(string code)
{
using (Py.GIL())
{
string try_code = "resultstr = ''\n" +
"try:\n " +
code.Replace("\n", "\n ") +
"\nexcept BaseException as e:\n" +
" resultstr = str(e)\n";
PythonEngine.RunString(try_code, Global.Handle, Local.Handle);
string result = Get("resultstr");
if (result != "")
{
MessageBox.Show("A python exception occured: " + result);
return false;
}
return true;
}
}
public dynamic Import(string module)
{
return Import(module, module);
}
public dynamic Import(string module, string alias)
{
dynamic res;
using (Py.GIL())
{
res = PythonEngine.ImportModule(module);
if (res == null)
{
throw new FileNotFoundException("Module '" + module + "' could not be imported.");
}
Global.SetItem(alias, res);
}
return res;
}
public void ImportNumpy()
{
np = Import("numpy", "np");
NumpyLoaded = true;
}
public void ImportScipy()
{
scipy = Import("scipy");
ScipyLoaded = true;
}
public void ImportScipyStack()
{
ImportNumpy();
ImportScipy();
}
public void ImportMatplotlib()
{
// Import matplotlib and set the renderer non-interactive
Import("matplotlib");
RunString("matplotlib.use('agg')");
Import("matplotlib.pyplot", "plt");
}
public void AddRelativePath(string path)
{
string CurrentDirectory = Directory.GetCurrentDirectory();
string NewPath = Path.GetFullPath(Path.Combine(CurrentDirectory, path));
AddPath(NewPath);
}
public void AddPath(string path)
{
if (!Directory.Exists(path))
{
throw new System.ArgumentException("Import path does not exist: " + path);
}
AdditionalPaths.Add(path);
BuildPythonpath();
}
public void NewEnvironment()
{
using (Py.GIL())
Locals.Push(new PyDict());
}
public void PushLocal(PyDict local)
{
using (Py.GIL())
Locals.Push(local);
}
public PyDict PopLocal()
{
using (Py.GIL())
return Locals.Pop();
}
public void ClearPath()
{
AdditionalPaths.Clear();
BuildPythonpath();
}
private void BuildPythonpath(bool AddToSys = true)
{
Pythonpath = new List<string>();
Pythonpath.Add(Path.GetFullPath(Path.Combine(PythonHome, "DLLs")));
Pythonpath.Add(Path.GetFullPath(Path.Combine(PythonHome, "Lib")));
Pythonpath.Add(Path.GetFullPath(Path.Combine(PythonHome, "Lib", "site-packages")));
foreach (string p in AdditionalPaths)
{
Pythonpath.Add(p);
}
if (AddToSys)
{
using (Py.GIL())
{
PyObject NewPath = Pythonpath.ToPython();
sys.path = NewPath;
}
}
}
}
}