related to C string and file handling

[EMBEDED SOFTWARE FOR GUI OF A SPECTRUM A]

Hi ,

In an application programme I am using two C files(say  F1.c and F2.c ). In F1.c I have declared a structure named

struct A

{

int i;

}Object;

Now when I am using this structure in other file F2.c the structure object and struct variable , compiler says undefined variable etc .

now tell me how to declare the variables ( i.e Object & i) in F2.c and use these in F2.c ?

subrata

[jr_2005]

You need to use a header file, containing the structure definition and #included by both of your c files. I would use a system similar to this:

<this is a new header file, eg defs.h>

typedef struct A {        // I prefer to use typedefs, especially in a header file
    int i;

} structA;

extern structA Object;    // This tells the compiler that another source
                          //  file is responsible for defining the variable

<within your F1.c and F2.c files, include this line:>

#include "defs.h"

<within just one of your source files (it does not really matter which), you need to define the actual variable at the top level>

structA Object;

In this manner, both your c files are aware of the single Object at compile time.

JR

Message Edited by jr_2005 on 03-08-2007 10:41 AM

[EMBEDED SOFTWARE FOR GUI OF A SPECTRUM A]

I see object name does not generate any error during compilation but the structure variable i.e int  i  ; causes the error .

subrata

[jr_2005]

Could you post a copy of the line which the compiler complains about?

JR

[EMBEDED SOFTWARE FOR GUI OF A SPECTRUM A]

Hello JR ,

Your suggestion is working now .Thanks a lot

subrata