问 Python - ctypes.c_char.from_buffer与ctypes.c_void_p(字符串)

EN

这两者之间有什么区别：

pointer = ctypes.c_char_p('abc')

和

string = 'abc'
buffer = (ctypes.c_char * len(string)).from_buffer(string)

从技术上讲，两者在各自的函数调用中传递时都是指针，如下所示：(跨平台不同的函数调用)

if os.name == 'posix':
    string = 'abc'
    libc = ctypes.CDLL('libc.so.6')
    # creating a pointer pointing at our string
    s_ptr = ctypes.c_char_p(string)
    # allocating free space
    free_space_ptr = ctypes.c_void_p(libc.valloc(ctypes.c_int(len(string))))
    # copying memory from one loc to another
    ctypes.memmove(free_space_ptr, s_ptr, ctypes.c_int(len(string)))
else:
    string = 'abc'
    # allocating free space
    free_space_ptr = ctypes.windll.kernel32.VirtualAlloc(...)