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
原文：http://www.letg.top/?p=34