Thread: Returning strings?

I am using DevC++ and I am trying to write a dll. I am using the following code but I get this error.

Code:

C:Dev-Cppc++ dll string$Makefile.win [Build Error]  No rule to make target `C++_DLL_STRINGprivate.rc', needed by `C++_DLL_STRINGprivate.res'.  Stop.

dllmain.cpp

Code:

/* Replace "dll.h" with the name of your header */
#include "dll.h"
#include <windows.h>

DLLEXPORT string returnstring(void);

BOOL APIENTRY DllMain (HINSTANCE hInst     /* Library instance handle. */ ,
                       DWORD reason        /* Reason this function is being called. */ ,
                       LPVOID reserved     /* Not used. */ )
{
    switch (reason)
    {
      case DLL_PROCESS_ATTACH:
        break;

      case DLL_PROCESS_DETACH:
        break;

      case DLL_THREAD_ATTACH:
        break;

      case DLL_THREAD_DETACH:
        break;
    }

    /* Returns TRUE on success, FALSE on failure */
    return TRUE;
}

dll.h

Code:

#include <cstdlib>
#include <iostream>
#ifndef _DLL_H_
#define _DLL_H_

#if BUILDING_DLL
# define DLLEXPORT __declspec (dllexport)
#else /* Not BUILDING_DLL */
# define DLLIMPORT __declspec (dllimport)
#endif /* Not BUILDING_DLL */
using namespace std;

DLLEXPORT string returnstring(void)
           {
 string my_string("hello big world");
           return my_string;
           }



#endif /* _DLL_H_ */

untitled1.rs(needed for program I am using the dll with)

Code:

#include "dll.h"
STRINGTABLE
BEGIN
{
     1 "returnstring%[s%returnstring%"
}

Why do I get this error and how do I fix it.

Yea here it is.

Code:

# Project: C++ DLL STRING$ # Makefile created by Dev-C++ 4.9.9.2 CPP = g++.exe CC = gcc.exe WINDRES = windres.exe RES = OBJ = dllmain.o $(RES) LINKOBJ = dllmain.o $(RES) LIBS = -L"C:/Dev-Cpp/lib" --no-export-all-symbols --add-stdcall-alias INCS = -I"C:/Dev-Cpp/include" CXXINCS = -I"C:/Dev-Cpp/lib/gcc/mingw32/3.4.2/include" -I"C:/Dev-Cpp/include/c++/3.4.2/backward" -I"C:/Dev-Cpp/include/c++/3.4.2/mingw32" -I"C:/Dev-Cpp/include/c++/3.4.2" -I"C:/Dev-Cpp/include" BIN = "C++ DLL STRING$.dll" CXXFLAGS = $(CXXINCS) -DBUILDING_DLL=1 CFLAGS = $(INCS) -DBUILDING_DLL=1 RM = rm -f .PHONY: all all-before all-after clean clean-custom all: all-before "C++ DLL STRING$.dll" all-after clean: clean-custom ${RM} $(OBJ) $(BIN) DLLWRAP=dllwrap.exe DEFFILE="libC++ DLL STRING$.def" STATICLIB="libC++ DLL STRING$.a" $(BIN): $(LINKOBJ) $(DLLWRAP) --output-def $(DEFFILE) --driver-name c++ --implib $(STATICLIB) $(LINKOBJ) $(LIBS) -o $(BIN) dllmain.o: dllmain.cpp $(CPP) -c dllmain.cpp -o dllmain.o $(CXXFLAGS)

dll.h needs to #include <string>