vs2015无法解析外部符号_imp_fprintf的问题

转自：http://www.cnblogs.com/ubosm/p/5444919.html
使用vs2015编译ffmpeg的一个小项时，出现了__imp__fprintf和__imp____iob_func 的错误，google了一下，有的人 建议下载SDL源码重新编译一下，当然这个方案非常不科学。所以又继续搜，终于有所发现。这是老外的原话：In visual studio 2015, stdin, stderr, stdout are defined as follow :

#define stdin  (__acrt_iob_func(0))#define stdout (__acrt_iob_func(1))#define stderr (__acrt_iob_func(2))

But previously, they were defined as:

#define stdin  (&__iob_func()[0])#define stdout (&__iob_func()[1])#define stderr (&__iob_func()[2])

So now __iob_func is not defined anymore which leads to a link error when using a .lib file compiled with previous versions of visual studio.To solve the issue, you can try defining

__iob_func()

yourself which should return an array containing

{*stdin,*stdout,*stderr}

.Regarding the other link errors about stdio functions (in my case it was

sprintf()

), you can add legacy_stdio_definitions.lib to your linker options.答题意思就是stdin, stderr, stdout 这几个函数vs2015和以前的定义得不一样，所以报错。解决方法呢，就是使用{*stdin,*stdout,*stderr}数组自己定义__iob_func()其实就是下边这样。

extern "C" { FILE __iob_func[3] = { *stdin,*stdout,*stderr }; }

然后__imp__fprintf的解决方法就是在链接器输入lib里加上legacy_stdio_definitions.lib这个LIB