openFrameworks OSC send sample

main.cpp

#include "ofMain.h"
#include "ofApp.h"

int main( ){
    ofSetupOpenGL(1024, 768, OF_WINDOW);
    ofRunApp(new ofApp());
}

ofApp.cpp

#include "ofApp.h"

void ofApp::setup() {
    // OSC Setup
    sender.setup(HOST, SEND_PORT);
}

void ofApp::mouseMoved(int x, int y) {
    int layer = 1;
    float opacity = ofMap(y, 0, ofGetHeight(), 1.0, 0);

    m.setAddress("/layer"+ofToString(layer)+"/video/opacity/values");
    m.addFloatArg(opacity);
    sender.sendMessage(m);
    m.clear();
}

ofApp.h

#pragma once

#include "ofMain.h"
#include "ofxOsc.h"

#define SEND_PORT 7000
#define HOST "localhost"

class ofApp : public ofBaseApp {
 public:
    void setup();
    void mouseMoved(int x, int y);

 private:
    ofxOscSender sender;
    ofxOscMessage m;
};