I recently picked up an old project involving WSTP (formerly MathLink) programs, and as a starting place tried to get the demos provided by Wolfram to compile. The instructions were dated, referring to Visual Studio 2010 and 2012, and key sections discussed only command line tools under Visual Studio 2012. I had no luck getting anything to compile or build.
I couldn't even get wsprep to output a .c file.
Has anybody had any luck with WSTP under the Visual Studio 2015 IDE? I'd love to hear what settings you used, etc.