SegFault

SDL Development
1

Okay gang,

Here’s my issue. The following code segfaults on execution of the
CApplication::Run() function. I have three files, Application.h,
Application.c and main.cc. The segfault occurs after exiting the
CApplication::Init() function. Any suggestions? When the code from the
CApplication::Init() function is moved to the main program body, it works
just fine.

Thanks,
David Wood

main.cc-----------------------

#include <stdio.h>
#include <Application.h>

void main() {

CApplication	*App;
int		retval;

if (App->Init() < 0) {
	printf("Failed to Initialize Application:");
}
App->Run();
App->DeInit();

}

Application.h

/* Application.h – Application Class Header File */

#INCLUDE <stdio.h>
#INCLUDE <SDL/SDL.h>

#DEFINE SC_STARTED 0
#DEFINE SC_RUNNING 1
#DEFINE SC_STOPPED 2

class CApplication {

protected:
	int AppState;

public:
	int	Init();
	int	Run();
	int	DeInit();
	CApplication();
	virtual ~CApplication();

};

Application.c

#INCLUDE “Application.h”

void CApplication::CApplication {

}

void CApplication::~CApplication {

}

int CApplication::Init() {

if (SDL_Init(SDL_INIT_VIDEO) < 0) {
	printf("Failed to Initialize Video:%s\n", SDL_GetError());
	exit(-1);
}
screen = SDL_SetVideoMode(640, 480, 8, SDL_SWSURFACE);
if (screen == NULL) {
	printf("Could Not set video mode");
	exit(-1);
}
return 0;

}

int CApplication::Run() {

}

int CApplication::DeInit() {

}

2

I screwed up this code listing, had to retype by hand and totally blew it.

Disregard this stupidity.> ----- Original Message -----

From: Wood, David [mailto:DWood@daedalcorp.com]
Sent: Wednesday, December 26, 2001 9:51 AM
To: ‘sdl at libsdl.org’
Subject: [SDL] SegFault

Okay gang,

Here’s my issue. The following code segfaults on execution of the
CApplication::Run() function. I have three files, Application.h,
Application.c and main.cc. The segfault occurs after exiting the
CApplication::Init() function. Any suggestions? When the code from the
CApplication::Init() function is moved to the main program body, it works
just fine.

Thanks,
David Wood

main.cc

#include <stdio.h>
#include <Application.h>

void main() {

CApplication *App;
int retval;

if (App->Init() < 0) {
printf(“Failed to Initialize Application:”);
}
App->Run();
App->DeInit();

}

Application.h

/* Application.h – Application Class Header File */

#INCLUDE <stdio.h>
#INCLUDE <SDL/SDL.h>

#DEFINE SC_STARTED 0
#DEFINE SC_RUNNING 1
#DEFINE SC_STOPPED 2

class CApplication {

protected:
int AppState;

public:
int Init();
int Run();
int DeInit();
CApplication();
virtual ~CApplication();

};

Application.c

#INCLUDE “Application.h”

void CApplication::CApplication {

}

void CApplication::~CApplication {

}

int CApplication::Init() {

if (SDL_Init(SDL_INIT_VIDEO) < 0) {
printf(“Failed to Initialize Video:%s\n”, SDL_GetError());
exit(-1);
}
screen = SDL_SetVideoMode(640, 480, 8, SDL_SWSURFACE);
if (screen == NULL) {
printf(“Could Not set video mode”);
exit(-1);
}
return 0;
}

int CApplication::Run() {

}

int CApplication::DeInit() {

}

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3

— “Wood, David” skrev: >

Okay gang,

Here’s my issue. The following code segfaults on
execution of the
CApplication::Run() function. I have three files,
Application.h,
Application.c and main.cc. The segfault occurs
after exiting the
CApplication::Init() function. Any suggestions?
When the code from the
CApplication::Init() function is moved to the main
program body, it works
just fine.

Thanks,
David Wood

main.cc

#include <stdio.h>
#include <Application.h>

void main() {

CApplication *App;
int retval;

if (App->Init() < 0) {
printf(“Failed to Initialize Application:”);
}
App->Run();
App->DeInit();

}

You need to allocate memory for the CApplication
pointer like so:
CApplication* App = new CApplication;
And when you are done, deallocate:
delete App;

/Anders_____________________________________________________
Do You Yahoo!?

4

Thanks a bunch. I figured it was something like that.

David Wood> ----- Original Message -----

From: Anders Lowgren [mailto:andersdarliah@yahoo.com]
Sent: Wednesday, December 26, 2001 10:32 AM
To: sdl at libsdl.org
Subject: Re: [SDL] SegFault

— “Wood, David” skrev: >

Okay gang,

Here’s my issue. The following code segfaults on
execution of the
CApplication::Run() function. I have three files,
Application.h,
Application.c and main.cc. The segfault occurs
after exiting the
CApplication::Init() function. Any suggestions?
When the code from the
CApplication::Init() function is moved to the main
program body, it works
just fine.

Thanks,
David Wood

main.cc

#include <stdio.h>
#include <Application.h>

void main() {

CApplication	*App;
int		retval;

if (App->Init() < 0) {
  printf("Failed to Initialize Application:");
}
App->Run();
App->DeInit();

}

You need to allocate memory for the CApplication
pointer like so:
CApplication* App = new CApplication;
And when you are done, deallocate:
delete App;

/Anders

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