Re: [Java-player-users] Problems with laserinterface

[Skuld <tan...@ho...>]

What is your version of JavaClient?

I don't work a lot on JavaClient, but I know that you have to call (directly
or not)
a function whose name is Read() (PlayerClient in the c++ native library), in
order to retrieve data from
Player/Stage, to fill up fields of your structure, and then you can reach
data by
functions like getRanges().
So your first call of getRanges, "lsri.getData().getRanges();", can't fill
these fields. It's useless.
Maybe you have to call readAll() (of the class PlayerClient in javaClient)
if you're not in threaded
mode, or call runThreaded(0,0) if you implemented the Runnable interface.
Those functions will call
an equivalent of Read.
I guess that "isDataReady" doesn't ask a reading from Player/Stage, but
only check if, in the most recent data retrieved, there is data about laser.
But you
still have to retrieve it.

If it doesn't work, check your "robot" creation. Maybe it's your nullpointer
error' source.

Do you know the name of the function which cause the error?


kevinl wrote:
> 
> Hi all,
> I don't know how to use the laserInterface, so I run the following code
> for a try:
> lsri = robot.requestInterfaceLaser (0, PlayerConstants.PLAYER_OPEN_MODE);
> while(lsri.isDataReady());
> 	lnum=lsri.getData().getRanges_count();
> 	lsri.getData().getRanges();
> 	ldata=lsri.getData().getRanges();
> 
> I get the error of "NullPointerException". Could you advise me on how to
> use the laserInterface? And I am confused with the method "public void
> readData(PlayerMsgHdr header)" , how can I get a PlayerMsgHdr variable?
> 
> Thanks a lot,
> kevin.
> 
> 

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