Hello everybody<div><br></div><div>I&#39;ve been trying to learn the basics on ROS and i&#39;ve come across this issue:</div><div><br></div><div>when I want to get an argument into a callback function in a normal subscriber i do this:</div>

<div><div><span class="Apple-tab-span" style="white-space:pre">	</span>ros::Subscriber sub = n.subscribe&lt;std_msgs::String&gt;(&quot;control&quot;, 1000, boost::bind(controlCallback,_1,&amp;z));</div></div><div><br></div>

<div>but if I want to make a similar thing into a service-called function i tried this (I want to pass the argument 500 into function troca):</div><meta http-equiv="content-type" content="text/html; charset=utf-8"><div><div>

<span class="Apple-tab-span" style="white-space:pre">	</span>ros::ServiceServer service = n.advertiseService&lt;std_msgs::String&gt;(&quot;switcher&quot;,boost::bind(troca,_1,_2,500));</div></div><div><br></div><div>And it doesn&#39;t work.</div>

<div><br></div><div>Can somebody help?</div><div>Thanks in advance</div><div>João</div><div><br></div>