Solved

C++ object method called from C

Posted on 1998-12-10
3
253 Views
Last Modified: 2010-04-02
I have to mix up C library functions and C++ objects.
At some point I wish that a C function calls a C++ method.

The problem is that the C functions is called from a .c compiled file.

This is an example of the cf function called from a function defined in a .c file.
cf( void* p ){
   ((Class*)p)->method();
}

Apparently it is possible to call C functions from C++ but not the reverse.

Any help would be warmly welcomed.
0
Comment
Question by:meessen
[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
  • 2
3 Comments
 
LVL 6

Accepted Solution

by:
stsanz earned 200 total points
ID: 1179818
Try defining an exported C function in your C++ files to wrap up the object method, so you can call C from C.

Declare this wrapper function as :
extern "C" MyWrapperFunction (...)
{ ... }


0
 
LVL 1

Author Comment

by:meessen
ID: 1179819
Ok. Just found out my self in the same time.
You gave the right answer.

I thought that using extern "C" would disallow to use method calls from within the encapsulated function. But apparently not. My test work.

Enjoy the points and the grade ;-)

0
 
LVL 6

Expert Comment

by:stsanz
ID: 1179820
extern "C" only defines how external parameters and return values are passed through, and how exported functions are named (the latter is different between C and C++)

Nevertheless, your extern "C" function is still C++ because it is defined in a CPP file.


 
0

Featured Post

Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

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

Templates For Beginners Or How To Encourage The Compiler To Work For You Introduction This tutorial is targeted at the reader who is, perhaps, familiar with the basics of C++ but would prefer a little slower introduction to the more ad…
What is C++ STL?: STL stands for Standard Template Library and is a part of standard C++ libraries. It contains many useful data structures (containers) and algorithms, which can spare you a lot of the time. Today we will look at the STL Vector. …
The viewer will learn how to pass data into a function in C++. This is one step further in using functions. Instead of only printing text onto the console, the function will be able to perform calculations with argumentents given by the user.
The viewer will learn how to clear a vector as well as how to detect empty vectors in C++.

734 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