Hello,

I have a C souces that i want to wrap and export from dll library. For example:

C_lang_struct_and_enum.h:

typedef struct
{
  int x;
  double y;
} AStruct;

typedef enum
{
  a,
  b,
  c
} AnEnum;

I also have a few C - functions using them:

C_lang_functions.h:

void PrintAStruct(AStruct s,AnEnum value)
{
 /*print stuff*/
}

I want to export those functions with wrappers:

CppDLL.cpp:

namespace SomeNamespace
{
   void wrapPrintAStruct(wrapAStruct s,wrapAnEnum value) //wrapper
  {
      PrintAStruct(s,value);
  }
}

CppDLL.h:

#ifdef CPP_DLL_EXPORTS
#define CPP_DLL_API __declspec(dllexport)
#else
#define CPP_DLL_API __declspec(dllimport)
#endif

namespace SomeNamespace
{
   typedef AStruct CPP_DLL_API wrapAStruct;
   typedef AnEnum CPP_DLL_API wrapAnEnum;
   CPP_DLL_API void wrapPrintAStruct(AStruct s,AnEnum value);
}

The DLL library is built succesfully, but I cannot use those symbols in a program as they seem to be undefined. How to workaround this? Any solution would be fine really.

Types are compile time, it doesn't make sense to load them dynamically at runtime from a DLL.

#ifdef CPP_DLL_EXPORTS
#define CPP_DLL_API __declspec(dllexport)
#else
#define CPP_DLL_API __declspec(dllimport)
#endif
 
#include "C_lang_struct_and_enum.h"

namespace SomeNamespace
{
   CPP_DLL_API void wrapPrintAStruct(AStruct s,AnEnum value);
}

Types are compile time, it doesn't make sense to load them dynamically at runtime from a DLL.

#ifdef CPP_DLL_EXPORTS
#define CPP_DLL_API __declspec(dllexport)
#else
#define CPP_DLL_API __declspec(dllimport)
#endif
 
#include "C_lang_struct_and_enum.h"

namespace SomeNamespace
{
   CPP_DLL_API void wrapPrintAStruct(AStruct s,AnEnum value);
}

But how to make those definitions remain in SomeNamespace?

If you need to wrap them too, then just add the typedefs again.

#ifdef CPP_DLL_EXPORTS
#define CPP_DLL_API __declspec(dllexport)
#else
#define CPP_DLL_API __declspec(dllimport)
#endif
 
#include"C_lang_struct_and_enum.h"

namespace SomeNamespace
{
   typedef AStruct wrapAStruct;
   typedef AnEnum wrapAnEnum;
   CPP_DLL_API void wrapPrintAStruct(AStruct s,AnEnum value);
}

thanks, I'll try :)