[Playerstage-users] RE: Accessing Proxy Data

[Julian H. <ju...@ne...>]

>I am attempting to write some functions in C++ that will access and write
to the position and laser proxies but they seem to return >unexpected data
when accessed outside of the main function.  I have included some basic code
to help understand the problem.

> 

>If I pass the proxy to the function as below, whenever I attempt to read
data from the proxy, it returns the data as it was before the >function was
called. 

>ie: proxy data is not being updated when inside the function.  However, I
can write to the proxy.  ie: it does actually go around in >circles as
intended. 

> 

>void circle(PlayerClient robot, PositionProxy pp){

>  robot.Read();

>  pp.SetSpeed(0.2,0.2);

>  pp.Print();

>}

> 

>int main(int argc, char **argv){

>  parse_args(argc,argv);

> 

>  PlayerClient robot(host,port);

>  PositionProxy pp(&robot,device_index,'a');

>  LaserProxy lp(&robot,device_index,'a');

> 

>  while(1){

>    circle(robot,pp);

>  }

>}

> 

> 

>I have also tried opening a new socket within the function as below.

> 

>void circle(){

>  PlayerClient robot(host,port);

>  PositionProxy pp(&robot,device_index,'a');

>  robot.Read();

>  pp.SetSpeed(0.2,0.2);

>  pp.Print();

>}

> 

>In the above case, veerLeft() is called with no arguments passed.  This
seems to work and is much faster, however I seem to get warnings >from
player such as; "warning : 499 bytes leftover on write() to client"

> 

> 

>Can anybody please explain to me what I am doing wrong?

> 

>Cheers,

 

 

 

The above "veerLeft()"  should read "circle()".