'How to create class DLL' Thread RSS Feed

How to create class DLL

Fri, 29 Jul 2005 06:30:47 -0700

Hello ,

I am developing application using COM interface. in that
application i created 2 class.
Now i want to convert that application in dll.
But i don't know how to create Class DLL in vc++ and use that
DLL in VB.

plase tell me how to create class DLL and how to use in vb.
send me source code if possile or tell me the steps.

waiting for +ve response.

Regards,
Rajesh

Re: How to create class DLL

Mon, 29 Aug 2005 15:42:30 -0700

: Hello ,
:
: I am developing application using COM interface. in that
: application i created 2 class.
: Now i want to convert that application in dll.
: But i don't know how to create Class DLL in vc++ and use that
: DLL in VB.
:
: plase tell me how to create class DLL and how to use in vb.
: send me source code if possile or tell me the steps.
:
: waiting for +ve response.
:
: Regards,
: Rajesh

First create a DLL project with the two classes in.
This is what I do:

class foo
{
   Create ();
};

// DLLs follow the C calling convention, so there
//is no standard way to export classes directly. MSVC
// provides a nonstandard way though.
extern "C"
{
_declspec (dllexport) int InitDLLInterface (foo** obj)
{
  *obj=new foo;
  return 0;
}
_declspec (dllexport) void ShutdownDLLInterface (foo** obj)
{
  delete obj;
}
}

If you link in the DLL's *.lib file, the OS will
automatically load the DLL at startup. Or you could
load it via MSVC ::LoadLibrary().

Sorry, dont know how to link DLLs with VB though.

Good Luck!

Re: How to create class DLL

Sun, 24 Apr 2011 09:48:57 -0700

The dll was great. But i want to know how the above code implement in in a class.

waiting for a postive response

Regards
Rejeesh R

Re: How to create class DLL

Thu, 22 Mar 2012 05:40:55 -0700

As you said,how to implement this code in a class.If I got your problem right, you need to create an MFC extension dll.
After creation and successful registration of this dll you can add reference in VB project.please go through the link below (if not found):

http://www.codeguru.com/cpp/cpp/cpp_mfc/tutorials/article.php/c4017

When you raised this question by saying you have an application using COM interface,why don't you create COM dll?

regards,
Vatsa
www.objectiveprogramming.com

Re: How to create class DLL

Thu, 22 Mar 2012 05:43:43 -0700