I keep getting an error when compiling an SDL program I'm working on.

I get the "'screen' was not declared in this scope" error, even though I'm pretty sure it's declared in 'globals.h'.

globals.h

#ifndef GLOBALS_H_INCLUDED
#define GLOBALS_H_INCLUDED
#include "gui.h"
#include "player.h"
#include "SDL.h"
#include "timer.h"
#include <stdlib.h>
#include <string>

SDL_Surface* screen = NULL;
SDL_Event event;
bool done;
int screenW = 640, screenH = 480

#endif

setup.h

#ifndef SETUP_H_INCLUDED
#define SETUP_H_INCLUDED
#include "globals.h"
#include "SDL.h"
#include "SDL_ttf.h"
#include <windows.h>

int createWindow()
{
    SDL_Init( SDL_INIT_EVERYTHING );
    TTF_Init();

    if(SDL_Init(SDL_INIT_VIDEO) < 0)
    {
        printf("Unable to initialize SDL: %s\n", SDL_GetError());
        return 1;
    }

    SDL_WM_SetCaption( "Thing", NULL );

    screen = SDL_SetVideoMode(screenW, screenH, 32, SDL_HWSURFACE|SDL_DOUBLEBUF|SDL_HWACCEL/*|SDL_RESIZABLE*/);
    if(!screen)
    {
        printf("Unable to set %ix%i video: %s\n", screenW, screenH, SDL_GetError());
        return 1;
    }

    return 0;
}

#endif

I get the error in the createWindow() function. It also says 'screenW' and 'screenH' aren't declared. Why is this? global.h is included and it worked all the time up until now.

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Answered by _avishek 29 in a post from

I think you need to prepend the keyword "extern" in line 10 of globals.h like so:

extern SDL_Surface* screen = NULL;

I also think that you need to prepend "extern" before the declaration of all the other global variables in globals.h.

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anyone?

This forum is really helpful...

I think you need to prepend the keyword "extern" in line 10 of globals.h like so:

extern SDL_Surface* screen = NULL;

I also think that you need to prepend "extern" before the declaration of all the other global variables in globals.h.

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