Python ctypes calling simple c++ dll

Question

I am really having a hard time to call a simple c++ dll from python using ctypes

Below is my C++ code :

#ifdef __cplusplus extern "C"{ #endif __declspec(dllexport) char const* greet() { return "hello, world"; } #ifdef __cplusplus } #endif

...

My Python code :

import ctypes testlib = ctypes.CDLL("CpLib.dll"); print testlib.greet();

When i run my py script, I get this strange return value of -97902232

Kindly assist.

David Heffernan · Accepted Answer · 2013-06-24 22:35:15Z

You didn't tell ctypes what type the return value is, and so it assumes that it is an integer. But it is in fact a pointer. Set the restype attribute to let ctypes know how to interpret the return value.

import ctypes testlib = ctypes.CDLL("CpLib.dll") testlib.greet.restype = ctypes.c_char_p print testlib.greet()

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