error 2059 in loadlibrary

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Jack C
Jack C on 21 Mar 2017
Commented: Rena Berman on 23 Mar 2017
I'm attempting to run a code through matlab on Windows 10 which was previously run on windows XP. Currently running MATLAB 2015a (64-bit) with Windows 7.1 SDK as the compiler. I get the following error:
Error using loadlibrary (line 395)
Building quadrupledll_thunk_pcwin64 failed.
quadrupledll.h(14) : error C2059: syntax error : 'string'
quadrupledll.h(16) : error C2059: syntax error : 'string'
quadrupledll.h(18) : error C2059: syntax error : 'string'
I assume referring to the lines beginning 'extern'.
The header file is as follows:
// The following ifdef block is the standard way of creating macros which make exporting
// from a DLL simpler. All files within this DLL are compiled with the QUADRUPLEDLL_EXPORTS
// symbol defined on the command line. this symbol should not be defined on any project
// that uses this DLL. This way any other project whose source files include this file see
// QUADRUPLEDLL_API functions as being imported from a DLL, wheras this DLL sees symbols
// defined with this macro as being exported.
#ifdef QUADRUPLEDLL_EXPORTS
#define QUADRUPLEDLL_API __declspec(dllexport)
#else
#define QUADRUPLEDLL_API __declspec(dllimport)
#endif
extern "C" QUADRUPLEDLL_API int __stdcall move_left_assembly(int,int);
extern "C" QUADRUPLEDLL_API int __stdcall move_right_assembly(int,int);
extern "C" QUADRUPLEDLL_API int __stdcall cleanup();
  5 Comments
Rena Berman
Rena Berman on 23 Mar 2017
(Answers Dev) Restored edit

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Accepted Answer

Philip Borghesani
Philip Borghesani on 22 Mar 2017
Loadlibrary compiles all thunk files as c not c++. The header file used must be c compatible, wrap all extern "C" statements with #ifdef __cplusplus as is normally recommended for c compatible headers.
  1 Comment
Walter Roberson
Walter Roberson on 22 Mar 2017
#ifdef...
extern "C" {
#endif
Put the declaration here
#ifdef...
}
#endif
As an outline

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