Thread: How to "enforce" pushing i.e. ctrl + c?

Hello,

I need to "enforce" autonomic pushing of a key combination in a program, like ctrl + c. I tried with VK_PASTE but on the list of errors I found that there was a problem with invalid key value or something and security issue. Somehow I understand the last one. Java won't let me do anything outside my program. But...

Now more detalis:

I mark with mouse some text, for example in pdf, independently running my program where I click let's say copy button, so I don't have to manually pushing combination on a keyboard. I have got what I wanted - that is a "thing" copied from other window in a clipboard BUT I didn't have to use my keyboard.

Robot class also fails cause it probably allows pushing one VK_key at once. I seen it lets use VK_PASTE, but as mentioned before - throws invalid key code + ...java.security.AccessController.doPrivileged(Nat ive Method)...

I'm little confused about it. Please don't write me that I should write my own OS with native problem solved ; ) Is there really any chance to make pushing virtually two buttons?

THE BEST example of my dissertation ; ) is Screen Keyboard available in WindowsOS. In the background like now writing this thread I mark some text, using my mouse I click on Ctrl, then C and voil'a. It works. So there must be a solution. But please, give me the right pathway to do so. Which library I should use or what technic?

I appreciate anyone who read it (or write me some clues).

Right now I'm running it directly from an IDE (NetBeans).

 JButton copy = new JButton("Copy");
        copy.addActionListener(new ActionListener()
        {
            public void actionPerformed(ActionEvent ae)
            {
 
                try {
                    Robot cpd = new Robot();
                    cpd.keyPress(KeyEvent.VK_COPY); // <<<<<<<<<< I think here lies the issue.
 
                } catch (AWTException ex) {
                    Logger.getLogger(Ramka.class.getName()).log(Level.SEVERE, null, ex);
                }
 
            }
        });

I've prepared an "SSCCE package" if this part of code isn't SSCE enough.

package sscceforum;
 
import java.awt.AWTException;
import java.awt.EventQueue;
import java.awt.GridLayout;
import java.awt.Robot;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
 
 
public class SscceForum {
 
    public static void main(String[] args) 
    {
      EventQueue.invokeLater(new Runnable()
         {
             public void run()
             {
                 JFrame ramka = new sceF();
                 ramka.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                 ramka.setVisible(true);
 
             }
         });       
    }
 
}
 
class sceF extends JFrame
{
    public sceF()
    {
        setUndecorated(true);
        setBounds(100,100,100,100);
 
        JButton copy = new JButton("Copy");
        copy.addActionListener(new ActionListener()
        {
            public void actionPerformed(ActionEvent ae)
            {
 
                try {
                    Robot cpd = new Robot();
                    cpd.keyPress(KeyEvent.VK_COPY);
 
                } catch (AWTException ex) {
                    Logger.getLogger(sceF.class.getName()).log(Level.SEVERE, null, ex);
                }
 
            }
        });
 
 
        JButton exit = new JButton("Close");
        exit.addActionListener(new ActionListener()
        {
            public void actionPerformed(ActionEvent ae)
            {
                System.exit(0);
            }
        });
 
        JPanel panel = new JPanel();
        panel.setLayout(new GridLayout(2,1));
 
        panel.add(copy);
        panel.add(exit);
 
        add(panel);
    }
}

And thanks to enlight me with sscce idea. It's a very gentle way of getting me by the shoulders, shake furiously, hit me on the ground and shout: show me the code! ; )

Exactly. I've already tried your suggestion. It doesn't work. But I noticed that Screen Keyboard all the time is out of focus if I can say so. It's only focused if I move it on the monitor and immediately turns "grey". I will try to do it on my own frame. About Clipboard class, I left it aside as I was thinking to find other solution, apparently wrong decision ; ) Ok, I try to figure it out and get this thread solved.

I wrote the post with the answer to this problem but it didn't appear here... Anyway THANK YOU Kevin for your participation and good advices. Cheers.