On Dec 11, 4:45 am, John Machin <[EMAIL PROTECTED]> wrote: > On Dec 11, 9:49 am, Explore_Imagination <[EMAIL PROTECTED]> > wrote: > > > Hi all > > > I am new to C and python ... I want to convert C data type uint64 > > variable into the Python 32bit Object. I am currently using Python 2.2 > > [ It is necessary to use it ] > > > Kindly give your suggestion how and in which way I can achieve this > > task. > > I'm not sure what you mean by "the Python 32bit Object". A Python int > object holds a signed 32-bit integer. A Python long object holds a > signed integer of arbitrary size. You will need to convert your uint64 > into a Python long; then, if necessary, check that the result will fit > in an int (result <= sys.maxint). > > If the "C variable" is in an 8-byte string that you have read from a > file, the unpack function in the struct module will do the job. > Assuming your computer is little-endian: > > >>> maxu64 = '\xff' * 8 # example input string > >>> import struct > >>> result = struct.unpack('<Q', maxu64)[0] > >>> result > > 18446744073709551615L>>> 2 ** 64 - 1 > > 18446744073709551615L > > If however you mean that in C code you need to build a Python object > to pass over to Python code: According to the Python/C API Reference > Manual (http://www.python.org/doc/2.2.3/api/longObjects.html): > > PyObject* PyLong_FromUnsignedLongLong(unsigned long long v) > Return value: New reference. > Returns a new PyLongObject object from a C unsigned long long, or > NULL on failure. > > If however you mean something else, .... > > HTH, > John
Thanks for your feedback ... Actually I want to pass unit64 variable in C to python but at the same time I want to have a generic code which should work on both little-endian and big endian architectures Any suggestions ? -- http://mail.python.org/mailman/listinfo/python-list