python - ctypes:printf 返回长度，它是 int 而不是字符串

Question

我正在使用 ctypes 并在 Python 2.5 中加载 msvcrt.dll。

>>> from ctypes import *
>>> libname = 'msvcrt.dll'
>>> libc = CDLL(libname)
>>> libc.printf("Hello World\n")
12
>>>  

为什么不打印Hello World？

Answer 1

Why doesn't it print Hello World?

当从控制台运行时，它在我的 Python(ActiveState，2.6)中执行:

>>> from ctypes import *
>>> libc = CDLL('msvcrt.dll')
>>> libc.printf("Hello world\n")
Hello world
12