Hi. I have the following problem, which leaves me somewhat flabbergasted.
I've loaded up the LrDevelopController sample plugin in Lightroom and written a c# counterpart to talk to it.
It works as expected, except I can't seem to send even a simple "hello world" string back to the external process.
Let me elaborate:
try
{
while (true)
{
var buffer = new byte[1024];
int received = _socket.Receive(buffer, SocketFlags.None);
if (received == 0) return;
var data = new byte[received];
Array.Copy(buffer, data, received);
var message = Encoding.ASCII.GetString(data);
// This raises an event
MessageReceived(message);
}
}
catch (Exception e)
{
Console.WriteLine(e);
}
Now, when I send a message to the plugin (via the appropriate c# sender socket), the plugin responds with "ok". So the Lr sender socket is actually working.
However, if I try a simple sender:send("hello world") ... nothing happens.
I've been digging around and I've found that I should actually append the strings with a new line in order for it to work - so i tried a /r/n. I even tried string.char(10)..string.char(13).
No dice.
This is the sender socket Lr code (I removed the observer, as I don't need automatic reporting of changes in the develop params).
local function makeSenderSocket( context )
-- A socket connection that sends messages from the plugin to the external process.
local sender = LrSocket.bind {
functionContext = context,
address = "localhost",
port = sendPort,
mode = "send",
plugin = _PLUGIN,
onConnecting = function( socket, port )
senderPort = port
maybeStartService()
end,
onConnected = function( socket, port )
senderConnected = true
end,
onMessage = function( socket, message )
-- Nothing, we don't expect to get any messages back.
end,
onClosed = function( socket )
-- If the other side of this socket is closed,
-- tell the run loop below that it should exit.
_G.running = false
end,
onError = function( socket, err )
if err == "timeout" then
socket:reconnect()
end
end,
}
return sender
end
And I'm trying to get a reply like this: I send a message from c# in a key, value format and the event looks like:
if key == "sendMessage" then
senderSocket:send( "Hello world\r\n" )
LrDialogs.showBezel( "fired", 1 )
return true
end
Lr shows the bezel, but the console output of the c# part looks like this
>>sent "sendMessage = true"
>>received "ok"
I'm at my wits end. Normally I would go like "f it" and use the observer, but I need to report more than simply the developer parameters, so I really need to send a couple of messages back to the c# app.
Would you kindly point me in the right direction?
1 Correct answer
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