Visual Studio 2008 - Creating DLL

**Hemal Das** · 26-03-2009

hi,
I have insatlled Visual Studio 2008.How can i create DLL in Project type Visual C++.Since I have not much worked with VS2008, I would be grateful for help

**kelfro** · 26-03-2009

Steps to Create Your DLL

Create a Win32 Dynamic Link Library project, adding a *. cpp and a *. h file.
In the *. cpp file, create a class instantiated from the CWinApp file.
In the *. h file (here it is SourceFile.h), define the functions to be used. Also specify the dllexport value for the _declspec function.
Then compile the DLL.
Create a normal Win32 Application with a *. cpp file and a *. h file.
In the *. h file, (here it is AppHeader.h), declare the function with the dllimport value of _declspec

In the *. cpp file, use the function.

Code:

# Include "AFXWIN.H" 
  # Include "AppHeader.h" 

  class MainFrame: public CFrameWnd 
  ( 
      public: 

          Mainframe () 
          ( 
              CreateProcess (0, "Trial"); 
          ) 

          OnLButtonDown void (UINT nFlags, CPoint point) 
          ( 
              int res; 
              char str [5]; 
              res = Calc (998, 226); 
              sprintf (str, "% d", res); 
              MessageBox (str); 
           ) 

           DECLARE_MESSAGE_MAP () 
  );

In the Link tab of the "Project-> Settings" dialog, go to the text box labeled "Object / Library Modules" and specify the path of the DLL file. Then copy the compiled DLL file to your current appliation path directory and run the program.

**Reegan** · 26-03-2009

If you want to create a "managed" (i.e. CLR-based) DLL to be used from C#, I think that you should choose "Class Library" (under Visual C++ / CLR node in the "Project types" tree). This class library will export "managed" (CLR-based) classes, i.e. it will have an object-oriented structure (with classes, methods, etc.)
You can create these classes using C++/CLI extensions to C++ language, and you can use these classes in other .NET languages, including C# and VB.NET.