Exports In Dll

[sandy111]

how do i export the functions wit same name but wit different paramet list using dll in .DEF FILE

like
LIBRARY "ABC"
EXPORT
XYZ



here i hav three definations of function xyz it cant link thats why
so please help me out

[weaknessforcats]

That you cannot do.

A DLL is an old C doo-dad and there is no function overloading in C. As a result, your three overloads in C++ must be exported using three unique names

EXPORT
XYZ1 first overload mangled name
XYZ2 second overload mangled name
XYZ3 third overload mangled name

[Banfa]

Using a .DEF file is the old way of doing things and as wfc points out makes experting overloaded functions a little hard.

What you should do is declare you function with __declarespec(dllexport) while compiling your DLL and then declare them with __declarespec(dllimport) while compiling the executeable you are using them from.

Here is an example

DLL header file DLLTester.h

#ifndef DLLTESTER_INCLUDED
#define DLLTESTER_INCLUDED
 
 
#ifdef DLLTESTER_EXPORTS
 
#define DLLTESTER_EXPORT __declspec( dllexport )
 
#else   // DLLTESTER_EXPORTS
 
#define DLLTESTER_EXPORT __declspec( dllimport )
 
#endif  // DLLTESTER_EXPORTS
 
 
extern DLLTESTER_EXPORT char Multiply(char a, char b);
extern DLLTESTER_EXPORT short Multiply(short a, short b);
extern DLLTESTER_EXPORT int Multiply(int a, int b);
extern DLLTESTER_EXPORT long Multiply(long a, long b);
 
 
#endif DLLTESTER_INCLUDED
 

DLL header file DLLTester.cpp

// DLLTester.cpp : Defines the entry point for the DLL application.
//
 
#define WIN32_LEAN_AND_MEAN        // Exclude rarely-used stuff from Windows headers
#include <windows.h>
 
#include "dlltester.h"
 
BOOL APIENTRY DllMain( HANDLE hModule, 
                       DWORD  ul_reason_for_call, 
                       LPVOID lpReserved
                     )
{
    return TRUE;
}
 
DLLTESTER_EXPORT char Multiply(char a, char b)
{
    return a*b;
}
 
DLLTESTER_EXPORT short Multiply(short a, short b)
{
    return a*b;
}
 
DLLTESTER_EXPORT int Multiply(int a, int b)
{
    return a*b;
}
 
DLLTESTER_EXPORT long Multiply(long a, long b)
{
    return a*b;
}
 

Note that DLLTESTER_EXPORTS was automatically added as a definition to the compiler command line by MSVC to indicate that we are compiling the DLL