C++: Unresolved external symbol _sprintf and _sscanf in Visual Studio 2015

Add the following library to the linker input files:

legacy_stdio_definitions.lib

VS 2015 now uses inline definitions that call internal functions for many of the stdio.h functions. If an object file (or library member) depends on one of those functions, then the legacy_stdio_definitions.lib provides an externally linkable version of the function that can be linked to.

Your other option is to recompile the unit that depends on those functions with VS 2015 (this is probably the preferred option).

I got this error compiling cycling max plugins against version 5 max sdk (pure c api). The legacy library fix didn't work for me (it should have, and if anyone had any idea why it mightn't I'd be curious), but I defined _NO_CRT_STDIO_INLINE before stdio was loaded and that did do the trick.