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SDL_PollEvent() problem

Started by andrern2000 Mar 28, 2009 at 12:23 AM 2 replies 1.6k views

Original Post

andrern2000

Mar 28, 2009 at 12:23 AM

Has anyone experienced SDL_PollEvent(&event) in a function quits its while loop at the beginning it's executed? while(SDL_PollEvent(&event)) ...in this code: int title_screen() { bool quit = false; Title theTitle; while( quit == false ) { //While there's events to handle while( SDL_PollEvent( &event ) ) { theTitle.handle_input(); if( event.type == SDL_QUIT ) { //Quit the program quit = true; } } //Apply surfaces apply_surface ( 0, 0, title, screen ); //Update the screen if( SDL_Flip( screen ) == -1 ) { return 1; } } return 0; } I'm using Multithreaded DLL code generation. The first time title_screen()executed it's normal. That function title_screen() is called within main(). But second time it's executed (the flow is after title_screen() -> main_menu() -> title_screen(), so this function is called again) the SDL_PollEvent() returns false, avoiding the handle_input() function. The main_menu() uses SDL_PollEvent() too and experiencing same problem: First time called it's normal, second call PollEvent() quits irresponsibly. What possibly happening? [Edited by - andrern2000 on March 28, 2009 4:56:12 AM]

andrern2000

Mar 28, 2009 at 12:53 AM

Sorry! No intend to spam. The double post is unintentional. I clicked the Submit button twice.

andrern2000

Mar 29, 2009 at 6:00 AM

Nobody want to help? I need the solution immediately.

Wait, let me rewind a bit detail:
There are no errors, just the missing condition somewhere in...

while( SDL_PollEvent(&event) )

...which makes it returns false when executed inside a function that's called twice within the main(), so that it won't enter the body. My question is: What causes it to return false?

====
Btw, my main() function:

main(...)
{
while (quit=false)
{
if mode=1
{ title_screen(); }
else
{ mainmenu(); }

//While there's events to handle
while( SDL_PollEvent( &event ) ) <-- Could it be collides with &event here?
{
if( event.type == SDL_QUIT )
{ //Quit the program
quit = true;
}
}
}

Kylotan

Mar 31, 2009 at 6:05 AM

SDL_PollEvent only returns true when there is actually an event to handle. Most of the time it will return false, and that's expected.

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