Finding Corners with Limelight C++

[briann]

Anyone have a code snippet in C++ of how to retrieve the cornx & corny values from the Limelight. We’ve passed every combination we can think of arrays and pointers to the Get function, but just keep getting “0s” back. We found a posted Java snippet, but haven’t successfully converted the code. Many thanks.

[Brian_Michell]

I think your snippet should look something like this:
nt::NetworkTableInstance::GetDefault().GetTable("limelight")->GetNumber("tcornx",0.0);
I’m just grabbing that snippet from the API documentation. Also be sure that you’ve enabled the “send contours” option in the “Output” tab.

[briann]

tcornx/tcorny appear to be arrays. So, the Get number function doesn’t seem to work. We’ve tried the GetArray and GetEntry functions, but can’t seem to get the syntax correct.

[Peter_Johnson]

NetworkTableInstance inst = nt::NetworkTableInstance::GetDefault();
std::shared_ptr<NetworkTable> table = inst.GetTable("limelight");
NetworkTableEntry entry = table->GetEntry("tcornx");
std::vector<double> values = entry.GetDoubleArray({});