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 PythonException()
{
IntPtr gs = PythonEngine.AcquireLock();
Runtime.PyErr_Fetch(ref _pyType, ref _pyValue, ref _pyTB);
if (_pyType != IntPtr.Zero && _pyValue != IntPtr.Zero)
{
string type;
string message;
Runtime.XIncref(_pyType);
using (var pyType = new PyObject(_pyType))
using (PyObject pyTypeName = pyType.GetAttr("__name__")) {
type = pyTypeName.ToString();
}
_pythonTypeName = type;
Runtime.XIncref(_pyValue);
using (var pyValue = new PyObject(_pyValue)) {
message = pyValue.ToString();
}
_message = type + " : " + message;
}
if (_pyTB != IntPtr.Zero)
{
using (PyObject tb_module = PythonEngine.ImportModule("traceback")) {
Runtime.XIncref(_pyTB);
using (var pyTB = new PyObject(_pyTB)) {
_tb = tb_module.InvokeMethod("format_tb", pyTB).ToString();
}
}
}
PythonEngine.ReleaseLock(gs);
}