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Help => Window => Topic started by: Pwndja on April 02, 2010, 05:23:17 am

Title: Holding down Lots of keys
Post by: Pwndja on April 02, 2010, 05:23:17 am

I am currently using 6 different keys in my app: [W, S, D, A, Left, Right]

Now when I push them all down they should still all work. But the S key does not registar. I changed the S key to be the X key and then all the keys work. It is only when I us the S key that they all do not work... That is all except the S key works. With the X = S key they all Work and when S = S key they all work except the S key. It is like it just skips the S key statement.

Code example:

Code: [Select]


while(1)
{

if (App.GetInput().IsKeyDown(sf::Key::W)) //do something
if (App.GetInput().IsKeyDown(sf::Key::S)) //do something ** this does not execute **
if (App.GetInput().IsKeyDown(sf::Key::D)) //do something
if (App.GetInput().IsKeyDown(sf::Key::A)) //do something
if (App.GetInput().IsKeyDown(sf::Key::Left)) //do something
if (App.GetInput().IsKeyDown(sf::Key::Right)) //do something
}

In the above example when I press all the keys: W, S, D, A, Left, Right everything executes except the S key.

But when I do this:

Code: [Select]

while(1)
{
if (App.GetInput().IsKeyDown(sf::Key::W)) //do something
if (App.GetInput().IsKeyDown(sf::Key::X)) //do something ***X Key Now***
if (App.GetInput().IsKeyDown(sf::Key::D)) //do something
if (App.GetInput().IsKeyDown(sf::Key::A)) //do something
if (App.GetInput().IsKeyDown(sf::Key::Left)) //do something
if (App.GetInput().IsKeyDown(sf::Key::Right)) //do something
}

They all work.

Any Ideas why this might be?

Title: Holding down Lots of keys
Post by: OniLinkPlus on April 02, 2010, 05:30:00 am

Not a problem with SFML. It's how keyboards are designed. Certain keys combos will not work on certain keyboards.

Title: Holding down Lots of keys
Post by: Pwndja on April 02, 2010, 06:50:39 am

Ok thanks. Is there any thing on the web that you might know of which discussions this issue more in-depth? like white pages or anything?

Title: Holding down Lots of keys
Post by: richardwb on April 02, 2010, 07:48:17 pm

Try a search for n-key rollover (http://www.google.ca/search?q=keyboard+n-key+rollover) and take a look at this Wikipedia article (http://en.wikipedia.org/wiki/Rollover_%28key%29).

Title: Holding down Lots of keys
Post by: Pwndja on April 04, 2010, 03:54:32 am

Awesome! Thank you for all the help :D