[ros-users] Question about policy-based synchronizer
Aditya Gadre
agadre at vt.edu
Mon Oct 18 03:28:28 UTC 2010
I am a new ROS user and have been trying to try the policy based
synchronizer. I copied the sample code from the wiki and was able to
build and run it. However, when I changed that code in order to
experiment, I ended up with a very long list of errors originating from
the line that instantiates the message_filters::Synchronizer. The
attached file lists the errors produced by the building process. The
code is reproduced below. The same code builds just fine if I use
sensor_msgs::Image instead of std_msgs::UInt32 and std_msgs::String classes.
I would appreciate any help in this matter!
Thanks,
- Aditya
=========================================
#include <std_msgs/UInt32.h>
#include <std_msgs/String.h>
#include <message_filters/subscriber.h>
#include <message_filters/synchronizer.h>
#include <message_filters/sync_policies/approximate_time.h>
void callback(const std_msgs::UInt32ConstPtr& pUint32,
const std_msgs::StringConstPtr& pString)
{
}
int main(int argc, char* argv[])
{
// init ros
ros::init(argc, argv, "test_policy_synchronizer_node");
ros::NodeHandle nh;
message_filters::Subscriber<std_msgs::UInt32> subUint32(nh,
"uint32", 1);
message_filters::Subscriber<std_msgs::String> subString(nh,
"string", 1);
typedef
message_filters::sync_policies::ApproximateTime<std_msgs::UInt32,
std_msgs::String>
MyApproxTimeSyncPolicy;
// The following line results in errors that are listed in the
attached file.
message_filters::Synchronizer<MyApproxTimeSyncPolicy>
sync(MyApproxTimeSyncPolicy(10), subUint32, subString);
// sync.registerCallback(boost::bind(&callback, _1, _2));
ros::spin();
// done
return 0;
}
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