How do I pass in the correct parameters for a UDP socket's send function in Ruby?-CodePudding

I'm trying to respond to a request using two UDP sockets. The server acting socket is getting a no implicit conversion to string error. I've checked that all parameters are of the correct objects. Please help me.

require 'socket'


socket = UDPSocket.new()
socket.bind('0.0.0.0',6666)
loop do
  command,sender = socket.recvfrom(24)
  ip = sender[3]
  resp = system(command)
  #sender[1] is the port of the sender. I've not used udp but that might be wrong.
  socket.send(resp, 0, ip.to_s, sender[1]) #no implicit conversion of true into String
end

CodePudding user response：

The error you are encountering is due to the fact that the resp variable, which is returned by the system method, is a boolean value (either true or false). However, the send method expects its first argument to be a string. When you pass a boolean value to send, it is unable to implicitly convert it to a string, hence the error message "no implicit conversion to string." To resolve this issue, you can convert the boolean value of resp to a string using the to_s method before passing it to send. This can be done like so: socket.send(resp.to_s, 0, ip.to_s, sender[1])

Or you can return a different value from the system call, such as the output of the command or a custom message indicating success or failure.

CodePudding user response：

socket.send's first argument should be a string. You have supplied the return value of system(command) which is a boolean.

If you wish to capture the output of running a command, you should use backticks rather than system.

resp = `#{command.to_s}`