The other night i was watching a google techtalk about python 3000 and Guido mentioned some problems with the C standard io library.
In particular he highlighted an issue with switching between reading and writing without flushing and the fact that it caused serious errors. Not that i dont think its a good idea to write a new io library, but I wondered if it was the same problem ive encounted. It only happens on windows that i know off, but the fix is simple... Assuming you have a hanlde to the file called "Handle" and a Flush() method, the following logic for read and write will allow you to detect and prevent the problem. Add this to the Read() method before reading takes place: if ( Handle && (Handle->_flag & _IORW) && (Handle->_flag & (_IOREAD | _IOWRT)) == _IOWRT ) { Flush(); Handle->_flag |= _IOREAD; } Add this to the Write() method before writing takes place: if ( Handle && (Handle->_flag & _IORW) && (Handle->_flag & (_IOREAD | _IOWRT)) == _IOREAD ) { Flush(); Handle->_flag |= _IOWRT; } Emerson _______________________________________________ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com