How to create dll in Visual Studio 2008 in Visual C++

Question

Hello,
I have insatlled Visual Studio 2008. I have to create DLL in Project
type Visual C++.
Which Template i have to select to reate dll, MFC DLL or Class
Library?.
I have to call or import this dll in Windows Forms Application. How
can i do this. Please give details procedure to do this.

Answer 1

If we look at how  AFX_CLASS_EXPORT and AFX_CLASS_IMPORT  are defined in afxv_dll.h we see the following.
#define AFX_CLASS_EXPORT __declspec(dllexport)
#define AFX_CLASS_IMPORT __declspec(dllimport)
So, when exporting our classes from our DLL we want the class declarations from the DLL to look like this:-
class __declspec(dllexport) CMyClass : public CObject
And, when importing our C++ classes into our application we want the class declarations from the DLL to look like this:-
class __declspec(dllimport) CMyClass : public CObject
OK, so here's how I do things.
In the stdafx.h file for the export DLL, include two #defines at the bottom of the file like this:-
#define _MYLIB_DLLAPI_
#define _MYLIB_NOAUTOLIB_
Now, in the main header file for your DLL, say mylib.h (the main 'point of entry' header for your DLL that you will include in you application later), add the following at the top:-
// The following will ensure that we are exporting our C++ classes when
// building the DLL and importing the classes when build an application
// using this DLL.
#ifdef _MYLIB_DLLAPI_
    #define MYLIB_DLLAPI  __declspec( dllexport )
#else
    #define MYLIB_DLLAPI  __declspec( dllimport )
#endif
// The following will ensure that when building an application (or another
// DLL) using this DLL, the appropriate .LIB file will automatically be used
// when linking.
#ifndef _MYLIB_NOAUTOLIB_
#ifdef _DEBUG
#pragma comment(lib, "mylibd.lib")
#else
#pragma comment(lib, "mylib.lib")
#endif
#endif
Now, just declare all the C++ classes you want exported from the DLL like this:-
(Note: Any C++ classes not declared with MYLIB_DLLAPI will not be exported from the DLL)
class MYLIB_DLLAPI CMyClass : public CObject
regards,
Matt John
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