DirectX encountered “unresolved external symbol” when compiling on vs2015__ The solution and reason of “vsnwprintf”

Note: The following error was encountered while compiling DirectX provided sample on VS2015

LNK2001 __vsnwprintf SimpleSample11 C:\Program Files (x86)\Microsoft DirectX SDK (June 2010)\Samples\C++\Direct3D11\SimpleSample11\ DxErr. Lib (dxErr.obj)

Some of the information found on the Internet is summarized as follows
The solution
Add the following compile preprocessor instruction to the source file that reported the error

#pragma comment(lib, "legacy_stdio_definitions.lib")

Error reason
The VS2015 design changed many of the original libraries to inline, and inline functions are not visible to DLLs or LIBs, so there is no library file to link to, so we have to add a special library file to link to the library functions, namely legacy_stdio_defines.lib. There are many Windows 8 SDKs that rely on these methods that have been inlined in the new runtime, and so far it seems that using legacy_stdio_defines.lib can remedy most of the problems left over from this change. According to Microsoft, they will update the Windows SDK in the final VS2015 release to resolve this issue.
Refer to the address

    (VS 2015 CTP 5 C++) _vsnwprintf_s and other functions are not exported in appcrt140.dll, breaking linkage of static libraries C++: Unresolved external symbol _sprintf and _sscanf in Visual Studio 2015missing (stdio) identifiers with external linkage


Read More: