another question about sdl.

[even821]

i do realise that i have asked a way to many questions lately, but thats in a way how i learned so please bear with me XD.

this is more of a question than a problem. here is my sdl code so far.

#include "SDL.h"

int main( int argc, char* args[] )
{
    SDL_Init (SDL_INIT_EVERYTHING);
	SDL_SetVideoMode (640,480, 32, SDL_SWSURFACE);
	SDL_WM_SetCaption ("hello world!", NULL);

	SDL_Delay ( 4000 );

    SDL_Quit();
    return 0;    
}

as you can see i use the SDL_Delay(); to make the program stay open for 4 seconds, but how can i make it stay open untill the user presses the exit button in the top right corner of the program?

[Disch]

You need to have an event loop.

Basically you wait for events (I think the function you want is SDL_WaitEvent, or SDL_PollEvent -- I forget the exact names) and then process them as they're received. When the user closes the program it will sent an SDL_Quit event. Once you receive that event you can exit the loop and thus the program.

There are examples in the SDL docs. Just look for SDL_WaitEvent.

[even821]

something like this?

#include "SDL.h"

int main( int argc, char* args[] )
{
    SDL_Init (SDL_INIT_EVERYTHING);
	SDL_SetVideoMode (640,480, 32, SDL_SWSURFACE);
	SDL_WM_SetCaption ("hello world!", NULL);
	SDL_Event event;

	while (SDL_PollEvent (&event)){
		
	}
	

    SDL_Quit();
    return 0;    
}

if so then how do i go from there?

[keineahnung]

SDL_Event event;
bool carry_on = true;

while ( carry_on )
{
    while ( SDL_PollEvent(&event) )
    {
        if ( event.type == SDL_QUIT )
        {
            carry_on = false;
        } // if
    } // while
} // while 

You'll exit that outer loop when you close the window :)

[even821]

it kinda works but the program freezes when i open it. any idea why?

[keineahnung]

Hi
Eeesh, you're having some problems with that SDL stuff :(
All I can say is these examples are all working perfectly on my system and I can't see anything wrong with any of the source code. For the record, that's CrunchBang Linux (32-bit) with g++ version 4.4.5.
Do you have a Linux install kicking around anywhere so you could try that? I wonder if the problem lies somewhere with your compiler/SDL libraries setup.

[even821]

the program kinda works on my system as well(windows 7). but it kinda freezes for the first 3-4 seconds and after that it does not respond. but i can exit the window using the exit thing. but it still dont respond in a way just pops up a window saying it doesen't respond an ask me if i want to exit (like any other program that does not respond.

i am starting to suspect that i have not installed sdl correctly, or that i have a wrong version installed.
i am using visual studio 2010 compiler and the 2005 version of sdl. (i could not find any version older than that)

[even821]

nevermind, it worked on my laptop so the problem was caused by my computer and not my code. thanks for all the help :D