SDL not responding to events

[julien CLEMENT-2]

Some parts of this message have been removed. Learn more about Nabble's security policy.

Hi,

I suggest a 'break' statement after the 'active=false'.

It may not explain why the app never quits but as soon as you've caught a quit event of any kind,

you may not want to continue reading the event queue. Moreover, supposing something is

producing SDL events continuously, then your program would never leave the "while" loop.

Also, you may replace the if(..) if(..) by a switch() ... case because in your code, you're testing for 'SDL_KEYDOWN'

even if you detected a 'SDL_QUIT' previously, which is a useless test to perform. A 'break' avoids this, and a switch...case

is even cleaner. This is not significant for catching 2 event types but if your application is growing, think about it.

Look at the examples in the SDL doc, it's a very good place to start writing efficient code.

Also, try putting a printf/cout inside the event loop to be sure it's the location where the program

is looping (and not in a previous function like in 'window.initialize').

Once you find where it is looping,  fix the problem.

Regards,
 

Julien CLEMENT

I'm trying to setup a basic SDL program but it won't respond to quit, keyboard events or anything. I have to open the task manager to close it. I'm not sure what's wrong.

Here's the code:


Code:
int main( int argc, char *argv[] )
{
    // setup system shutdown handler
    atexit( SDL_Quit );

    // create window
    Window window( 640, 400, false );
    window.initialize();

    // create event manager
    SDL_Event event;

    // create clock
    Clock clock;

    // main loop
    while( active )
    {
        // begin loop iteration
        clock.start();

        // handle events
        while( SDL_PollEvent( &event ) )
        {
            if( event.type == SDL_QUIT )
            {
                active = false;
            }
            if( event.type == SDL_KEYDOWN )
            {
                if( event.key.keysym.sym == SDLK_ESCAPE )
                {
                    active = false;
                }
            }
        }
        // end loop iteration
        clock.pause();
    }
    
    // shut down
    SDL_Quit();
    return 0;

_______________________________________________
SDL mailing list
SDL@...
http://lists.libsdl.org/listinfo.cgi/sdl-libsdl.org