B4J Code Snippet B4J Copy files to the clipboard.

I needed a system to copy files to the clipboard just like CTRL-C. I don't think B4J can do it.
So I did it in JAVA and compiled a .jar file.
Return a list with the full path and file name (C:\myfolder\myfile.ext) this works with any type of file (txt, pdf, docx, etc...)
The JAVA code was written with Notepad++ and compiled with a .bat file.
For those who are interested, here's the procedure. You don't have to do this, as I've attached the JAR file.

Expected file structure for compilation.
your_folder/
│
├── compile_clipboard_jar.bat
├── src/
│ └── b4j/
│ └── helper/
│ └── ClipboardFileCopier.java

package b4j.helper;

import java.awt.*;
import java.awt.datatransfer.*;
import java.io.File;
import java.util.List;
import java.util.ArrayList;

public class ClipboardFileCopier {

   public static void copyFilesToClipboard(java.util.List<String> filePaths) {
    java.util.List<File> files = new java.util.ArrayList<>();
    for (String path : filePaths) {
        File file = new File(path);
        if (file.exists()) {
            files.add(file);
        }
    }

    if (!files.isEmpty()) {
        FileTransferable ft = new FileTransferable(files);
        Clipboard clipboard = Toolkit.getDefaultToolkit().getSystemClipboard();
        clipboard.setContents(ft, null);
    }
}

    

    static class FileTransferable implements Transferable {
        private final List<File> files;

        public FileTransferable(List<File> files) {
            this.files = files;
        }

        public DataFlavor[] getTransferDataFlavors() {
            return new DataFlavor[] { DataFlavor.javaFileListFlavor };
        }

        public boolean isDataFlavorSupported(DataFlavor flavor) {
            return DataFlavor.javaFileListFlavor.equals(flavor);
        }

        public Object getTransferData(DataFlavor flavor) {
            return files;
        }
    }
}

@echo off
setlocal

:: Directory containing the Java file
set SRC_DIR=src
:: Output directory for compiled classes
set BIN_DIR=bin
:: Final JAR file name
set JAR_NAME=ClipboardFileCopier.jar
:: Package name + main class
set MAIN_CLASS=b4j.helper.ClipboardFileCopier

:: Creation of folder if necessary
if not exist %BIN_DIR% mkdir %BIN_DIR%

:: Compiling the Java class
echo Compiling the Java class...
javac -encoding UTF-8 -d %BIN_DIR% %SRC_DIR%\b4j\helper\ClipboardFileCopier.java

:: Creation of the MANIFEST file
echo Manifest-Version: 1.0> manifest.txt
echo Main-Class: %MAIN_CLASS%>> manifest.txt

:: Creating the JAR file
echo creating the JAR file...
jar cfm %JAR_NAME% manifest.txt -C %BIN_DIR% .

:: Cleaning
del manifest.txt

echo.
echo ✅ Done! The file %JAR_NAME% is ready.
pause

For B4J
Put the JAR file in the additional libraries folder.

Add

#AdditionalJar: ClipboardFileCopier.jar

and use

Private Sub CopyToClipboard(l As List)
    Dim jo As JavaObject
    jo.InitializeStatic("b4j.helper.ClipboardFileCopier")
    jo.RunMethod("copyFilesToClipboard", Array(l))
End Sub

Have fun

 

[Mariano Ismael Castro]

Hello, thank you very much for sharing your code, it works very well. This is another way that also works, using Java Inline. I have placed your code on a B4XMainPage class.

Private Sub Button1_Click
    Dim listFile As List = Array("C:\Users\DELL I7 7MA\Documents\document.pdf")
    Dim jo As JavaObject = Me
    jo.RunMethod("copyFilesToClipboard", Array(listFile))
End Sub

#If Java
import java.awt.*;
import java.awt.datatransfer.*;
import java.io.File;
import java.util.List;
import java.util.ArrayList;

public void copyFilesToClipboard(java.util.List<String> filePaths)
{
   java.util.List<File> files = new java.util.ArrayList<>();
   for (String path : filePaths)
   {
      File file = new File(path);
      if (file.exists())
      {
        files.add(file);
      }
    }

    if (!files.isEmpty())
    {
       FileTransferable ft = new FileTransferable(files);
       Clipboard clipboard = Toolkit.getDefaultToolkit().getSystemClipboard();
       clipboard.setContents(ft, null);
    }
}
    
class FileTransferable implements Transferable
{
    private final List<File> files;
      public FileTransferable(List<File> files)
    {
       this.files = files;
    }

    public DataFlavor[] getTransferDataFlavors()
    {
       return new DataFlavor[] { DataFlavor.javaFileListFlavor };
    }

    public boolean isDataFlavorSupported(DataFlavor flavor)
    {
       return DataFlavor.javaFileListFlavor.equals(flavor);
    }

    public Object getTransferData(DataFlavor flavor)
    {
            return files;
    }
}
#End If

 

[zed]

Of course it will work. But I find the code is cleaner with a JAR.
That's why I put the whole procedure. If someone prefers a JAR instead of the code, they can compile it with a bat file. To each their own way.