Develop Reference

How to send OSC to QLab with Java?

I am trying to send OSC (Open Sound Control) to Figure 53's QLab. So far I have come up with this code.
import com.illposed.osc.transport.udp.OSCPortOut;
import com.illposed.osc.OSCMessage;
import java.io.IOException;
import java.net.InetAddress;
import java.net.UnknownHostException;
public class controller {
public static void main(String[] args) throws UnknownHostException, IOException {
OSCPortOut sender = new OSCPortOut(InetAddress.getByName("10.67.192.113"), 53000);
OSCMessage msg = new OSCMessage("/cue/1");
try {
sender.send(msg);
} catch (Exception e) {
e.printStackTrace();
}
}
}
I have successfully added Illposed's JavaOSC library to my code, but then it says I need SLF4J, and when I try to add slf4j-api-1.7.30.jar it says Failed to load class "org.slf4j.impl.StaticLoggerBinder". When I try to run the above code with both libraries SLF4J and JavaOSC.

You will need to use Maven to handle the dependencies JavaOSC needs.
Here's a good tutorial for Eclipse. Just use a simple project, you do not need to do archetype selection.
Then add the following at the end of your new projects pom.xml file, before
</project>
but after everything else.
`<dependency>`
<groupId>com.illposed.osc</groupId>
<artifactId>javaosc-core</artifactId>
<version>0.7</version>
</dependency>

MyObjectBox is red/not found but Java app still works

I'm trying to use ObjectBox in a simple java server side app.
Everything is working fine, I'm putting things in boxes etc, but the MyObjectBox class is always red when I use it.
I can see the generated .class and .java files, along with the meta _ classes, in build/classes/main/db (db is the package name I have in my actual code), but for some reason I can't import MyObjectBox.
Because of this, I also can't import the _ classes for use in Queries, which now kind of prevents me from getting any further.
My code to use objectBox is inside a class called DB which I have copied below, in case there's anything I'm doing wrong with that.
But as it actually works, I'm very confused!!
Thanks
UPDATE: if I run gradle clean build, my app runs fine, if I run Build->Build Project in intelliJ then I get the error
Error:(27, 21) java: cannot find symbol
symbol: variable MyObjectBox
location: class DB
.
package db;
import java.io.File;
import java.io.IOException;
import io.objectbox.Box;
import io.objectbox.BoxStore;
public class DB {
private File boxStoreDir;
private static BoxStore store;
public DB() {
try {
createMyObjectBox();
} catch (IOException e) {
e.printStackTrace();
}
}
private void createMyObjectBox() throws IOException {
File objectstorefile = new File("../objectBox/objectstorefile");
if(!objectstorefile.isDirectory()) {
objectstorefile.mkdirs();
}
boxStoreDir = objectstorefile;
if(store == null) {
store = MyObjectBox.builder().directory(boxStoreDir).build();
}
}
public<T> Box<T> getBox(Class<T> object) {
if(store == null) {
try {
createMyObjectBox();
} catch (IOException e) {
e.printStackTrace();
}
}
return store.boxFor(object);
}
}

Forget the apply plugin: 'net.ltgt.apt-idea' in build.gradle

"Attributes and objects cannot be resolved" - error

The following code is for reading or writing files with java, but:
Eclipse prints these errors:
buffer_1 cannot be resolved to a variable
file_reader cannot be resolved
also other attributes...
what is wrong in this code here:
//Class File_RW
package R_2;
import java.io.File;
import java.io.FileReader;
import java.io.FileNotFoundException;
import java.lang.NullPointerException;
public class File_RW {
public File_RW() throws FileNotFoundException, NullPointerException {
File file_to_read = new File("C:/myfiletoread.txt");
FileReader file_reader = new FileReader(file_to_read);
int nr_letters = (int)file_to_read.length()/Character.BYTES;
char buffer_1[] = new char[nr_letters];
}
public void read() {
file_reader.read(buffer_1, 0, nr_letters);
}
public void print() {
System.out.println(buffer_1);
}
public void close() {
file_reader.close();
}
public File get_file_to_read() {
return file_to_read;
}
public int get_nr_letters() {
return nr_letters;
}
public char[] get_buffer_1() {
return buffer_1;
}
//...
}
//main method # class Start:
package R_2;
import java.io.File;
import java.io.FileReader;
import java.io.FileNotFoundException;
import java.lang.NullPointerException;
public class Start {
public static void main(String[] args) {
File_RW file = null;
try {
file = new File_RW();
} catch (NullPointerException e_1) {
System.out.println("File not found.");
}
//...
}
}
I can't find any mistake. I have also tried to include a try catch statement into the constructor of the class "File_RW", but the error messages were the same.

Yes, there are errors in your code - which are of really basic nature: you are declaring variables instead of fields.
Meaning: you have them in the constructor, but they need to go one layer up! When you declare an entity within a constructor or method, then it is a variable that only exists within that constructor/method.
If you want that multiple methods can make use of that entity, it needs to be a field, declared in the scope of the enclosing class, like:
class FileRW {
private File fileToRead = new File...
...
and then you can use your fields within all your methods! Please note: you can do the actual setup within your constructor:
class FileRW {
private File fileToRead;
public FileRW() {
fileToRead = ..
but you don't have to.
Finally: please read about java language conventions. You avoid using "_" within names (just for SOME_CONSTANT)!

javacode already running...thx
same program edited with c++ in visual Studio express...
visit the stackoverflow entry link:
c++ file read write-error: Microsoft Visual C++ Runtime libr..debug Assertion failed, expr. stream.valid()

Error executing PigServer in Java

I am trying to run pig scripts remotely from my java machine, for that i have written below code
code:
import java.io.IOException;
import java.util.Properties;
import org.apache.pig.ExecType;
import org.apache.pig.PigServer;
import org.apache.pig.backend.executionengine.ExecException;
public class Javapig{
public static void main(String[] args) {
try {
Properties props = new Properties();
props.setProperty("fs.default.name", "hdfs://hdfs://192.168.x.xxx:8022");
props.setProperty("mapred.job.tracker", "192.168.x.xxx:8021");
PigServer pigServer = new PigServer(ExecType.MAPREDUCE, props);
runIdQuery(pigServer, "fact");
}
catch(Exception e) {
System.out.println(e);
}
}
public static void runIdQuery(PigServer pigServer, String inputFile) throws IOException {
pigServer.registerQuery("A = load '" + inputFile + "' using org.apache.hive.hcatalog.pig.HCatLoader();");
pigServer.registerQuery("B = FILTER A by category == 'Aller';");
pigServer.registerQuery("DUMP B;");
System.out.println("Done");
}
}
but while executing i am getting below error.
Error
ERROR 4010: Cannot find hadoop configurations in classpath (neither hadoop-site.xml nor core-site.xml was found in the classpath).
I don't know what am i doing wrong.

Well, self describing error...
neither hadoop-site.xml nor core-site.xml was found in the classpath
You need both of those files in the classpath of your application.
You ideally would get those from your $HADOOP_CONF_DIR folder, and you would copy them into your Java's src/main/resources, assuming you have a Maven structure
Also, with those files, you should rather use a Configuration object for Hadoop
PigServer(ExecType execType, org.apache.hadoop.conf.Configuration conf)

Java on Windows: how to delete a file to trash (using JNA)

I'm not experiences with Windows API at all, so please excuse my ignorance.
I want to delete files to the trash. How to do that using JNA and how to detect if this would not be possible, e.g., because the files are located on a network share?

Use com.sun.jna.platform.FileUtils instead of com.sun.jna.platform.win32.W32FileUtils directly.
import java.io.File;
import java.io.IOException;
import com.sun.jna.platform.FileUtils;
public class MoveToTrash {
public static void main(String[] args){
FileUtils fileUtils = FileUtils.getInstance();
if (fileUtils.hasTrash()) {
try {
fileUtils.moveToTrash( new File[] {new File("c:/temp/dummy.txt") });
}
catch (IOException ioe) {
ioe.printStackTrace();
}
}
else {
System.out.println("No Trash available");
}
}
}

Use com.sun.jna.platform.win32.W32FileUtils, which has moveToTrash and hasTrash methods defined.