Solved

Calling function in MFC ActiveX from C code

Posted on 2001-06-08
6
250 Views
Last Modified: 2012-08-14
I am new to C++ so forgive me if this is a simple question.

I have a MFC ActiveX made by the Control Wizard, I have included some C code into the project.

I want to call a function in the MFC class from my C code, but the function name is CX254Ctrl::NcbCompletion which C code will not recognise.

I am able to call function in the C code from C++ by using extern "C".

0
Comment
Question by:ianfmurray
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 3
  • 2
6 Comments
 
LVL 5

Expert Comment

by:proskig
ID: 6167456
Put a static (extern "C") wrapper around your CX254Ctrl::NcbCompletion.
0
 

Author Comment

by:ianfmurray
ID: 6167565
Sorry but i need more information.
0
 
LVL 5

Expert Comment

by:proskig
ID: 6167696
If NcbCompletion is a static function:

extern "C"
{
foo NcbCompletion(...)
{
 return CX254Ctrl::NcbCompletion(...);
}
}

If not then, inside global NcbCompletion you have to determine object, and call

yourObject.NcbCompletion(...);
0
What does it mean to be "Always On"?

Is your cloud always on? With an Always On cloud you won't have to worry about downtime for maintenance or software application code updates, ensuring that your bottom line isn't affected.

 
LVL 2

Accepted Solution

by:
tdubroff earned 300 total points
ID: 6168923
The main problem is you are trying to call C++ member functions from C code.  The following link provides some insight into this:

http://www.develop.com/hp/slip/ctocpp.pdf

Hope it helps.
0
 

Author Comment

by:ianfmurray
ID: 6182065
I think the comment from tdudroff is pointing in the right direction, but since I am a novice the artical  is a bit to complex for me.

In the X254Ctrl.cpp file I have

void CX254Ctrl::NcbCompletion()
{
     FireNcbComplete();

     //CX254Ctrl::NcbCom();
}

In the X254Ctrl.h file I have

public:
     void NcbIfm();
     void NcbCompletion();
     enum {
     //{{AFX_DISP_ID(CX254Ctrl)
     dispidTrace = 1L,
     dispidRemoteNua = 2L,
     dispidNcbReturn = 3L,
     dispidNcbCommand = 4L,
     dispidNcbCommandReturn = 5L,
     dispidClearCall = 6L,
     dispidEntry = 7L,
     dispidMakeCall = 8L,
     dispidProcessNcbCompletion = 9L,
     eventidNcbComplete = 1L,
     //}}AFX_DISP_ID
     };
and am trying to call CX254Ctrl::NcbCompletion() from some C code in the same workspace.

0
 

Author Comment

by:ianfmurray
ID: 6248783
No more answers since 06/08/2001 so i had better accept the answer
0

Featured Post

[Live Webinar] The Cloud Skills Gap

As Cloud technologies come of age, business leaders grapple with the impact it has on their team's skills and the gap associated with the use of a cloud platform.

Join experts from 451 Research and Concerto Cloud Services on July 27th where we will examine fact and fiction.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Go is an acronym of golang, is a programming language developed Google in 2007. Go is a new language that is mostly in the C family, with significant input from Pascal/Modula/Oberon family. Hence Go arisen as low-level language with fast compilation…
Basic understanding on "OO- Object Orientation" is needed for designing a logical solution to solve a problem. Basic OOAD is a prerequisite for a coder to ensure that they follow the basic design of OO. This would help developers to understand the b…
The viewer will learn how to use the return statement in functions in C++. The video will also teach the user how to pass data to a function and have the function return data back for further processing.
The viewer will be introduced to the technique of using vectors in C++. The video will cover how to define a vector, store values in the vector and retrieve data from the values stored in the vector.

635 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question