I am trying to use cx_Oracle to connect to a database and am getting this error at the point in the code when I issue the cx_Oracle.connect statement. I am running windows 7 and have tried with both 32 and 64 bit versions of python and the corresponding Oracle Instant Client versions.
If I run through Visual Studio Code I dont get this error but I get the error "DPI-1050: Oracle Client library is at version 0.0 but version 11.2 or higher is needed". I spent quite some time checking for possible solutions and following the suggestions posted (this one for example) but with no luck.
The GetOverlappedResultEx WinAPI function is new in Windows 8.
As such, this means that your copy of cx_Oracle (or some DLL that it links against -- perhaps the Oracle client library) does not support your version of Windows.
(btw kudos to package authors for such a helpful error message)