detecting multiple keys press

I am writing a multiplayer mode for my little c# game. I want two users to be able to control their car simultaneous from the same keyboard. The problem is that when I try to keep more than 2 keys pressed (let's say accelerate and left for both players...totally 4 keys) the computer doesn't recognize them (and in my case it starts beeping from the internal speaker). How can I solve this problem
If you keep down only two keys everything it's ok... To make it work I used the keydown and keyup events of the form and an array of bool[] to store if a certain key is kept pressed.
If you have any idea how to solve it.. please reply. I have the feeling that is something more complex and that I will have to work directly with the keyboard input... 10X

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detecting multiple keys press

Chinese Boy

Maybe a better way to detect the keys currently pressed is to use api code.

The following example show the use for this method, create a form, add 4 labels to it (label1,2,3,4) and on the load form event call the method :CheckKeysThread();

Try to press up, down, right, left.

Here is the code you need to add to the form:

[DllImport("user32", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]

public static extern UInt16 GetAsyncKeyState(int vKey);

public static bool IsKeyPressed(Keys k)

{

int s = (int)GetAsyncKeyState((int)k);

s = (s & 0x8000) >> 15;

return (s == 1);

}

public void CheckKeysThread()

{

Thread t = new Thread(new ThreadStart(CheckKeys));

t.Start();

}

public void CheckKeys()

{

while (true)

{

UpdateText(label1, "UP = " + IsKeyPressed(Keys.Up));

UpdateText(label2, "down = " + IsKeyPressed(Keys.Down));

UpdateText(label3, "left = " + IsKeyPressed(Keys.Left));

UpdateText(label4, "Right = " + IsKeyPressed(Keys.Right));

Thread.Sleep(1000);

}

}

private delegate void UpdateTextHandler(Label control, string text);

private void UpdateText(Label control, string text)

{

if (!control.InvokeRequired)

control.Text = text;

else

{

UpdateTextHandler handler = new UpdateTextHandler(UpdateText);

control.BeginInvoke(handler, new

object[] { control, text });

}

}
detecting multiple keys press

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