Function PyCom_BuildPyException

com/win32com/src/ErrorUtils.cpp:573–614

/////////////////////////////////////////////////////////////////// Client Side Errors - translate a COM failure to a Python exception ///////////////////////////////////////////////////////////////////

//
////////////////////////////////////////////////////////////////////////
PyObject *PyCom_BuildPyException(HRESULT errorhr, IUnknown *pUnk /* = NULL */, REFIID iid /* = IID_NULL */)
{
	PyObject *obEI = NULL;
	TCHAR scodeStringBuf[512];
	GetScodeString(errorhr, scodeStringBuf, sizeof(scodeStringBuf)/sizeof(scodeStringBuf[0]));

#ifndef MS_WINCE // WINCE doesnt appear to have GetErrorInfo() - compiled, but doesnt link!
	if (pUnk != NULL) {
		assert(iid != IID_NULL); // If you pass an IUnknown, you should pass the specific IID.
		// See if it supports error info.
		ISupportErrorInfo *pSEI;
		HRESULT hr;
		Py_BEGIN_ALLOW_THREADS
		hr = pUnk->QueryInterface(IID_ISupportErrorInfo, (void **)&pSEI);
		if (SUCCEEDED(hr)) {
			hr = pSEI->InterfaceSupportsErrorInfo(iid);
			pSEI->Release(); // Finished with this object
		}
		Py_END_ALLOW_THREADS
		if (SUCCEEDED(hr)) {
			IErrorInfo *pEI;
			Py_BEGIN_ALLOW_THREADS
			hr=GetErrorInfo(0, &pEI);
			Py_END_ALLOW_THREADS
			if (hr==S_OK) {
				obEI = PyCom_PyObjectFromIErrorInfo(pEI, errorhr);
				PYCOM_RELEASE(pEI);
			}
		}
	}
#endif // MS_WINCE
	if (obEI==NULL)	{
		obEI = Py_None;
		Py_INCREF(Py_None);
	}
	PyObject *evalue = Py_BuildValue("iNOO", errorhr, PyWinObject_FromTCHAR(scodeStringBuf), obEI, Py_None);
	Py_DECREF(obEI);

	PyErr_SetObject(PyWinExc_COMError, evalue);
	Py_XDECREF(evalue);
	return NULL;
}

// Uses the HRESULT and an EXCEPINFO structure to create and
// set a pythoncom.com_error.