16进制浮点数相互转换

# -*- coding: utf8 -*-

import ctypes

def h2f(s):

    cp = ctypes.pointer(ctypes.c_long(s))

    fp = ctypes.cast(cp, ctypes.POINTER(ctypes.c_float))

    return fp.contents.value

def f2h(s):

    fp = ctypes.pointer(ctypes.c_float(s))

    cp = ctypes.cast(fp, ctypes.POINTER(ctypes.c_long))

    return hex(cp.contents.value)

print(f2h(3.1415))

print(h2f(0x40490e56))







#-------------------




ret = f2h(3.1415)       # ret  = "0x40490e56"

ret2 = h2f(int(ret,16)) # ret2 = 3.14149999619


ret3 = "%.4f"%ret2      # ret3 = "3.1415"


ret4 = float(ret3)      # ret4 = 3.1415