从python中的c dll获取char数组作为字符串

Question

I am a beginner with ctypes and I can not figure out how to turn char array into a string in python. I have started using :

create_string_buffer(bytes(var, 'utf8')) to populate an array, but had no luck with getting it back as a string using "byref()".

If someone has any idea you would be a life saver. Thanks in advance!

Answer 1

ctypes page: [Python]: ctypes - A foreign function library for Python .
It's hard to tell without seeing some code, but here's an example:

 >>> import sys >>> import ctypes >>> "Python {:s} on {:s}".format(sys.version, sys.platform) 'Python 3.5.2 (default, Nov 23 2017, 16:37:01) \\n[GCC 5.4.0 20160609] on linux' >>> src = "some dummy Python string" >>> src_charp = ctypes.create_string_buffer(src.encode()) >>> dst_initial = b"Just " >>> dst_charp = ctypes.create_string_buffer(len(dst_initial) + len(src) + 1) >>> dst_charp <ctypes.c_char_Array_25 object at 0x7fe6c41209d8> >>> dst_charp.value b'' >>> for idx, c in enumerate(dst_initial): ... dst_charp[idx] = c ... >>> dst_charp.value b'Just ' >>> ctypes.CDLL(None).strcat(dst_charp, src_charp) 32414128 >>> dst_charp <ctypes.c_char_Array_25 object at 0x7fe6c41209d8> >>> dst_charp.value b'Just some dummy Python string' >>> dst = dst_charp.value.decode() >>> dst 'Just some dummy Python string' 

Notes :

• Uses [man7]: STRCAT(3) as an example. For more details on how , please check [SO]: How does ctypes.cdll.LoadLibrary(None) work? (@CristiFati's answer)
• There was no byref involved