Solution for link error:Cannot Open File 'python27

本文详细介绍了在Windows环境下使用C语言调用Python函数或解释器时遇到的LINK:fatal error LNK1104: cannot open file 'python27_d.lib'编译错误的解决方案。通过定义MS_NO_COREDLL或Py_NO_ENABLE_SHARED预处理器宏，可以避免此错误。同时，提供了针对不同编译器的特定代码段，以确保正确引入Python库文件。

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转自http://guangboo.org/2013/01/17/solution-link-errorcannot-open-file-python27_dlib

使用C调用Python函数或解释器时，在添加了Include Directories和Library Directories等配置后，仍然编译错误："LINK : fatal error LNK1104: cannot open file 'python27_d.lib'"

/* For Windows the Python core is in a DLL by default.  Test
Py_NO_ENABLE_SHARED to find out.  Also support MS_NO_COREDLL for b/w compat */
#if !defined(MS_NO_COREDLL) && !defined(Py_NO_ENABLE_SHARED)
#	define Py_ENABLE_SHARED 1 /* standard symbol for shared library */
#	define MS_COREDLL	/* deprecated old symbol */
#endif /* !MS_NO_COREDLL && ... */

/*  All windows compilers that use this header support __declspec */
#define HAVE_DECLSPEC_DLL

/* For an MSVC DLL, we can nominate the .lib files used by extensions */
#ifdef MS_COREDLL
#	ifndef Py_BUILD_CORE /* not building the core - must be an ext */
#		if defined(_MSC_VER)
			/* So MSVC users need not specify the .lib file in
			their Makefile (other compilers are generally
			taken care of by distutils.) */
#			ifdef _DEBUG
#				pragma comment(lib,"python27_d.lib")
#			else
#				pragma comment(lib,"python27.lib")
#			endif /* _DEBUG */
#		endif /* _MSC_VER */
#	endif /* Py_BUILD_CORE */
#endif /* MS_COREDLL */

可以发现，只有MS_NO_COREDLL或Py_NO_ENABLE_SHARED被定义了，那么#ifdef MS_COREDLL块的代码就不会被编译。因此可以在Configuration Properties->C/C++->Preprocessor->Preprocessor Definitions添加MS_NO_COREDLL或Py_NO_ENABLE_SHARED，去掉_DEBUG，将没有效果。也可以在引用python.h头文件前添加#define MS_NO_COREDLL或#define Py_NO_ENABLE_SHARED。