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Reading JoyStick Buttons

Posted on 1998-04-03
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Last Modified: 2011-09-20
How do I read buttons 1 and 2 on a joystick? A component would be nice... Is there a way to do it so it is responsive but not at the expense of using up all processing power?
I'm desperate for this..... 850!!!!! points to the person with a good answer.
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Question by:davegreen
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JimBob091197 earned 3400 total points
ID: 1361260
Hi

The joystick functions are in the MMSystem unit.
Basically, you can get the joystick status by calling JoyGetPos.  This returns the X, Y and Z positions, and the states of buttons 1 to 4.

E.g. suppose you have 3 labels (lblX, lblY and lblZ) and 4 checkboxes (chk1 to chk4):
var
  JI: TJoyInfo;
begin
  joyGetPos(0, @JI);
  lblX.Caption := IntToStr(JI.wXpos);
  lblY.Caption := IntToStr(JI.wYpos);
  lblZ.Caption := IntToStr(JI.wZpos);
  chk1.Checked := (JI.wButtons and JOY_BUTTON1 > 0);
  chk2.Checked := (JI.wButtons and JOY_BUTTON2 > 0);
  chk3.Checked := (JI.wButtons and JOY_BUTTON3 > 0);
  chk4.Checked := (JI.wButtons and JOY_BUTTON4 > 0);
end;

A better way, though, is to use the JoySetCapture api call to send joystick notifications to your app.  I have a component which does this.  If you would like it, mail me at davekw@iafrica.com.

Regards,
JB
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