C++ Network Tables to LabVIEW

Technical C/C++
#1

Our team is experimenting with an off season robot and wants to send a camera image from a co-processor to the LabVIEW Driver station. No one on the team is familiar with the ntcore or the NetworkTable libraries in C++.

We know that the libraries and the .dll is installed correctly and is working from testing.


#include <opencv2\videoio.hpp>
#include <opencv2\highgui.hpp>
#include <opencv2\opencv.hpp>
#include <ntcore.h>
#include <networktables/NetworkTable.h>

using namespace cv;
using namespace std;
using std::shared_ptr;

void main()
{

        NetworkTable::SetServerMode();
	NetworkTable::SetIPAddress("10.74.32.11");  //ip address of co-processor
	NetworkTable::Initialize();
	shared_ptr<NetworkTable> myTable = NetworkTable::GetTable("SmartDashboard");

... //code for grabbing image and manipulating it 

	cv::Size size = dst.size();

	int total = size.width * size.height * dst.channels();
	std::vector<uchar> data(dst.ptr(), dst.ptr() + total);
	std::string s(data.begin(), data.end());
	myTable->PutString("Eagle_Eye", s);
}

Our question is what is the proper way to set up the network tables with a LabVIEW dashboard to send the compressed string s to the network tables.

RoboRio IP 10.74.32.2
Co-Processor IP 10.74.32.11
Driver Station IP 10.74.32.5

7432 NOS

#2

NetworkTables is for sending small bits of data between different devices on the network. Image frames are not small.

If the camera you’re using is a USB webcam or IP camera, I strongly recommend plugging it into the roboRIO and have the roboRIO handle it; you can follow these instructions

Otherwise, you should write a small CameraServer app to run on the co-processor, since it’s designed exactly for this usecase.

As a side note, the NetworkTables guide you seem to be following is several years out of date. You should read through the current NetworkTables guides on screensteps

#3