Multiple source files & structures?

NeHe Productions Affiliates

Started by TerraX August 09, 2001 03:07 PM

2 comments, last by TerraX 22 years, 8 months ago

180

Author

August 09, 2001 03:07 PM

Hiya, firstly sorry about the off topic nature of this post, but I dunno where there are other forums related to C which have such talented people

My problem is this.... I have multiple source and header files for my latest OpenGL space shooter type game and I want to be able to share structures across these files. I know how to do it with simple variables Example. int AmountOfCheese; // variable in level1.cpp extern int AmountOfCheese; // variable in level1.h I would also put #include "level1.h" at the top of the cpp file. I firstly, am not sure if the above way is correct (teaching myself c at the same time), but it works for me

SO, again, my question

How do I share structures between multiple files? Please help, it''d make my life alot easier

Lukerd

122

August 09, 2001 03:27 PM

Hi,

Well that''s the way I do it but I taught myself as well

Anyway to share a struct all you have to do is write the structure in a header file and then include the header file with any source files that need to access the structure. Then use extern like you did for the variables. For example, say you wanted to share the structure for a Vertex between files in a header file you could put the following:

struct VERTEX {
float x, y, z;
};

extern VERTEX Vertex1;

Then in the source file:
#include "Header.h"

VERTEX Vertex1;

I hope that helps

Lukerd

"To err is human, to really mess up requires a computer"

"To err is human, to really mess up requires a computer"

marcos

122

August 09, 2001 03:27 PM

to share structs among different files you just have to put all structs declarations you need to be seen by the files wich will share the declarations in a simple .h header. Example:

in structs.h:
myStruct {
int x;
int y;
};

in code.c:
#include "structs.h"
myStruct point;

in code2.c:
#include "structs.h"
myStruct *point3;

...and so you will be sharing the declaration of myStruct among the files code.c and code2.c

I hope this help you. Sorry for my english

game developer

TerraX

180

Author

August 10, 2001 05:19 PM

Worked a treat guyz thanx!!!!

While I''m here...
Marcos, your English is MUCH better than any of my other languages

, perfeclty readable and understandable

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