python 报reading location 0x00000000

Question

由于对python不太熟悉，需用python调用dll;
现有dll接口函数:business_handle(char in, char * out)
下面代码cmd正常运行,打包后报：Access violation reading location 0x00000000
outputData=ctypes.create_string_buffer('/0'*100)

business_handle = self._libc.BUSINESS_HANDLE

business_handle.argtypes=[ctypes.c_char_p,ctypes.c_char_p]
business_handle.restype=ctypes.c_int

business_handle(inputData,outputData)

有哪位大神帮忙写个能正常调用的例子！

Answer 1

找了个例子，可以执行

 import platform
from ctypes import *

if platform.system() == 'Windows':
    libc = cdll.LoadLibrary('msvcrt.dll')
elif platform.system() =='Linux':
    libc = cdll.LoadLibrary('libc.so.6')

libc.printf('Hello ctypes!\n')

结果

 C:\Users\BJWUYBDNW\Desktop>python a.py
Hello ctypes!

C:\Users\BJWUYBDNW\Desktop>