Method CheckForError

Rendering/Matplotlib/vtkMatplotlibMathTextUtilities.cxx:315–377

------------------------------------------------------------------------------

//------------------------------------------------------------------------------
bool vtkMatplotlibMathTextUtilities::CheckForError()
{
  vtkPythonScopeGilEnsurer gilEnsurer;
  PyObject* exception = PyErr_Occurred();
  if (exception)
  {
    if (this->Debug)
    {
      // Fetch the exception info. Note that value and traceback may still be
      // nullptr after the call to PyErr_Fetch().
      PyObject* type = nullptr;
      PyObject* value = nullptr;
      PyObject* traceback = nullptr;
      PyErr_Fetch(&type, &value, &traceback);
      vtkSmartPyObject tracebackStr;
      if (traceback)
      {
        vtkSmartPyObject tb_module = PyImport_ImportModule("traceback");
        if (tb_module)
        {
          vtkSmartPyObject format_tb = PyObject_GetAttrString(tb_module, "format_tb");
          if (format_tb)
          {
            vtkSmartPyObject tracebacklist =
              PyObject_CallFunction(format_tb, const_cast<char*>("O"), traceback);
            Py_ssize_t tbsz = PySequence_Length(tracebacklist);
            tracebackStr = PyUnicode_FromString("");
            for (Py_ssize_t i = 0; i < tbsz; ++i)
            {
              vtkSmartPyObject item = PySequence_GetItem(tracebacklist, i);
              if (!item)
              {
                continue;
              }
              tracebackStr = PyUnicode_Concat(tracebackStr, item);
              if (!tracebackStr)
              {
                break;
              }
            }
          }
        }
      }
      if (!tracebackStr)
      {
        tracebackStr = PyObject_Str(traceback);
      }
      vtkSmartPyObject typeStr(PyObject_Str(type));
      vtkSmartPyObject valueStr(PyObject_Str(value));
      vtkWarningMacro(<< "Python exception raised:\n"
                      << "\nStack:\n"
                      << (tracebackStr ? const_cast<char*>(PyUnicode_AsUTF8(tracebackStr))
                                       : "(none)")
                      << "\nValue:\n"
                      << (valueStr ? const_cast<char*>(PyUnicode_AsUTF8(valueStr)) : "(none)")
                      << "\nType:\n"
                      << (typeStr ? const_cast<char*>(PyUnicode_AsUTF8(typeStr)) : "(none)"));
    }