import ctypes
import os
import platform
from ctypes import *
import time

FN_do_test = {}
FN_do_test["name"] = "do_test"
FN_do_test["argtypes"] = [ctypes.c_void_p]
FN_do_test["restype"] = []

read_lib_name = "D:\\code\\kent\\gitee\\python-sdk\\libtestcallback.dll"
nativelib = PyDLL(read_lib_name,ctypes.RTLD_GLOBAL)
print("native lib: ",nativelib)
nativelib.dotest.argtypes = [ctypes.c_void_p]
nativelib.dotest.restypes = []
platsys = platform.platform()
if platsys.lower().startswith("win"):
    libc = cdll.msvcrt
##linux
if "linux" in platsys.lower():
    cdll.LoadLibrary("libc.so.6")

def fn_callback(buffer,buffersize):
    print("buffer:{},size:{}".format(buffer,buffersize))
    #strbuffer = ctypes.string_at(buffer)

    strbuffer :ctypes.c_char*10 = b''
    strbuffer.from_buffer(buffer,0)
    print("aaa",strbuffer)

    libc.strncpy(buffer,b"abcdefg\0",5)
    print("now buffer is ",ctypes.string_at(buffer))

    l = libc.strlen(buffer)
    return l



CFN_CALLBACK = CFUNCTYPE(ctypes.c_int,POINTER(ctypes.c_char_p),ctypes.c_int)
cb = CFN_CALLBACK(fn_callback)
print("cb:",cb)
nativelib.dotest(cb)

#while 1:
time.sleep(3)