Solved

About map..

Posted on 2002-07-30
6
179 Views
Last Modified: 2010-04-01
Hi Friends
       i have a problem... i have a file(say file1.cxx) in which i declare a map & through a function on this file say enter i can insert value in this map..now i want to call this function from another file having extension .c & wants to enter value in it from that file..but linker error comes .. how it can be possible..

bye
Jonmac
0
Comment
Question by:JonMac
6 Comments
 
LVL 3

Accepted Solution

by:
MDarling earned 50 total points
ID: 7187668
put

extern "C"

on the front of your function.

This will stop C++ name mangling and make it callable from your C file.
0
 
LVL 3

Expert Comment

by:MDarling
ID: 7187675
=== main.c ===

#include "myheader.h"

int main()
{
    map_insert("hello");
    map_insert("world");
    return 0;
}

=== header file ===

#ifndef myheader_h
#define myheader_h

#ifdef __cplusplus
extern "C" {
#endif

int map_insert(char* s);

#ifdef __cplusplus
};
#endif

#endif


=== C++ Source ===

#include "myheader.h"
#include <iostream>

using namespace std;

int map_insert(char* s)
{
    cerr << s << ' ';
    return 0;
}
0
 
LVL 30

Expert Comment

by:Axter
ID: 7188164
Which are you trying to do?

[1] Are you trying to access a function in a *.cxx file from a *.c file?

OR

[2] Are you trying to access a function in a *.c file from a *.cxx file?
0
Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

 
LVL 30

Expert Comment

by:Axter
ID: 7207692
JonMac,
Did you forget this question?
0
 
LVL 11

Expert Comment

by:griessh
ID: 7439585
Dear

I think you forgot this question. I will ask Community Support to close it unless you finalize it within 7 days. You can always request to keep this question open. But remember, experts can only help you if you provide feedback to their questions.
Unless there is objection or further activity,  I will suggest to accept

     "MDarling"

PLEASE DO NOT ACCEPT THIS COMMENT AS AN ANSWER!
======
Werner
0
 
LVL 6

Expert Comment

by:Mindphaser
ID: 7479729
Force accepted

** Mindphaser - Community Support Moderator **
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

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…
Introduction This article is the first in a series of articles about the C/C++ Visual Studio Express debugger.  It provides a quick start guide in using the debugger. Part 2 focuses on additional topics in breakpoints.  Lastly, Part 3 focuses on th…
The goal of the video will be to teach the user the concept of local variables and scope. An example of a locally defined variable will be given as well as an explanation of what scope is in C++. The local variable and concept of scope will be relat…
The goal of the video will be to teach the user the difference and consequence of passing data by value vs passing data by reference in C++. An example of passing data by value as well as an example of passing data by reference will be be given. Bot…

920 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

Need Help in Real-Time?

Connect with top rated Experts

13 Experts available now in Live!

Get 1:1 Help Now