public static void With(PyObject obj, Action <dynamic> Body)
{
// Behavior described here:
// https://docs.python.org/2/reference/datamodel.html#with-statement-context-managers
IntPtr type = Runtime.PyNone;
IntPtr val = Runtime.PyNone;
IntPtr traceBack = Runtime.PyNone;
PythonException ex = null;
try {
PyObject enterResult = obj.InvokeMethod("__enter__");
Body(enterResult);
}
catch (PythonException e) {
ex = e;
type = ex.PyType;
val = ex.PyValue;
traceBack = ex.PyTB;
}
var exitResult = obj.InvokeMethod("__exit__", new PyObject(type), new PyObject(val), new PyObject(traceBack));
if (ex != null && !exitResult.IsTrue())
{
throw ex;
}
}
public object TrueDispatch(ArrayList args)
{
MethodInfo method = dtype.GetMethod("Invoke");
ParameterInfo[] pi = method.GetParameters();
IntPtr pyargs = Runtime.PyTuple_New(pi.Length);
Type rtype = method.ReturnType;
for (var i = 0; i < pi.Length; i++)
{
// Here we own the reference to the Python value, and we
// give the ownership to the arg tuple.
IntPtr arg = Converter.ToPython(args[i], pi[i].ParameterType);
Runtime.PyTuple_SetItem(pyargs, i, arg);
}
IntPtr op = Runtime.PyObject_Call(target, pyargs, IntPtr.Zero);
Runtime.XDecref(pyargs);
if (op == IntPtr.Zero)
{
var e = new PythonException();
throw e;
}
if (rtype == typeof(void))
{
return(null);
}
object result = null;
if (!Converter.ToManaged(op, rtype, out result, false))
{
Runtime.XDecref(op);
throw new ConversionException($"could not convert Python result to {rtype}");
}
Runtime.XDecref(op);
return(result);
}