Function PyCom_ExcepInfoFromPyException

com/win32com/src/ErrorUtils.cpp:64–109

Generically fills an EXCEP_INFO. The scode in the EXCEPINFO is the HRESULT as nominated by the user.

// Generically fills an EXCEP_INFO.  The scode in the EXCEPINFO
// is the HRESULT as nominated by the user.
void PyCom_ExcepInfoFromPyException(EXCEPINFO *pExcepInfo)
{
	// If the caller did not provide a valid exception info, get out now!
	if (pExcepInfo==NULL) {
		PyErr_Clear(); // must leave Python in a clean state.
		return;
	}
	PyObject *exception, *v, *tb;
	PyErr_Fetch(&exception, &v, &tb);
	if (PyCom_ExcepInfoFromPyObject(v, pExcepInfo, NULL))
	{
		// done.
	}
	else
	{
		memset(pExcepInfo, 0, sizeof(EXCEPINFO));
		// Clear the exception raised by PyCom_ExcepInfoFromPyObject,
		// not the one we are interested in!
		PyErr_Clear();
		// Not a special exception object - do the best we can.
		char *szBaseMessage = "Unexpected Python Error: ";
		char *szException = GetPythonTraceback(exception, v, tb);
		size_t len = strlen(szBaseMessage) + strlen(szException) + 1;
		char *tempBuf = new char[len];
		if (tempBuf) {
			snprintf(tempBuf, len, "%s%s", szBaseMessage, szException);
			pExcepInfo->bstrDescription = PyWin_String_AsBstr(tempBuf);
			delete [] tempBuf;
		} else
			pExcepInfo->bstrDescription = SysAllocString(L"memory error allocating exception buffer!");
		pExcepInfo->bstrSource = SysAllocString(L"Python COM Server Internal Error");

		// Map some well known exceptions to specific HRESULTs
		// Note: v can be NULL. This can happen via PyErr_SetNone().
		//       e.g.: KeyboardInterrupt
		if (PyErr_GivenExceptionMatches(exception, PyExc_MemoryError))
			pExcepInfo->scode = E_OUTOFMEMORY;
		else
			// Any other common Python exceptions we should map?
			pExcepInfo->scode = E_FAIL;
	}
	Py_XDECREF(exception);
	Py_XDECREF(v);
	Py_XDECREF(tb);
	PyErr_Clear();
}

static BOOL PyCom_ExcepInfoFromServerExceptionInstance(PyObject *v, EXCEPINFO *pExcepInfo)
{