Albert-Jan Roskam wrote: > I have a program that reads and writes files using ctypes. When I want it > to read AND write (e.g. read a file, select some stuff and write that), > the library returns a 'read-open' error. I think that the pointer to the > file handle for read and write point to the same address.
In C fopen() returns a FILE *, open() returns an int. If your library expects a file handle, i. e. an int you can open the file in Python f = open(filename, "r+b") and pass f.fileno() to the library. > To test that > hypothesis, I wrote the simplified code below. Problem is, that I can't > make it work, let alone come up with a solution. ;-( How do I tell ctypes > to use a particular chunck of memory, so read and write buffers do not > mutually interfere? Maybe the 'offset' parameter of ctypes.byref? I think you should turn to python-list instead of tutor with problems like this. _______________________________________________ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
