B4J Question How to Insert an image to a pdf file.

'WebSocket class
Sub Class_Globals
    Private ws As WebSocket
End Sub

Public Sub Initialize
   
End Sub

Private Sub WebSocket_Connected (WebSocket1 As WebSocket)
    ws = WebSocket1
    Log("Connected")
    InsertImage
End Sub
Private Sub InsertImage()
    Dim script As String =$"
     const insertButton = document.getElementById('insertButton');

        insertButton.addEventListener('click', async () => {
        const existingPdfUrl = 'test.pdf'; // Replace with your PDF file
        const imageUrl = 'SampleJPG.jpg'; // Replace with your image URL
       
        // Load the existing PDF
        const existingPdfBytes = await fetch(existingPdfUrl).then(res => res.arrayBuffer());
        const pdfDoc = await PDFLib.PDFDocument.load(existingPdfBytes);

        // Load the image to be inserted
        const imageBytes = await fetch(imageUrl).then(res => res.arrayBuffer());
        const image = await pdfDoc.embedJpg(imageBytes);

        // Get the first page of the PDF (change the index if needed)
        const page = pdfDoc.getPages()[0];

        // Insert the image at the specified coordinates
        page.drawImage(image, {
            x: 100, // X-coordinate of the top-left corner
            y: 400, // Y-coordinate of the top-left corner
            width: 200,
            height: 100,
        });

        // Generate a new PDF with the inserted image
        const modifiedPdfBytes = await pdfDoc.save();

        // Create a blob from the PDF bytes and create a download link
        const blob = new Blob([modifiedPdfBytes], { type: 'application/pdf' });
        const url = URL.createObjectURL(blob);
        alert(url);
        const a = document.createElement('a');
        a.href = url;
        a.download = 'modified-pdf.pdf';
        a.click();
        });
    "$
      ws.Eval(script,Null)
      ws.Flush
End Sub
Private Sub WebSocket_Disconnected

End Sub

srvr.AddWebSocket("/insertImage/ws", "WSInsertImage")

#Region Project Attributes
    #MainFormWidth: 600
    #MainFormHeight: 600
#End Region
#AdditionalJar:pdfbox-app-2.0.16.jar
Sub Process_Globals
    Private fx As JFX
    Private MainForm As Form
    Private xui As XUI
    Private Button1 As B4XView
End Sub

Sub AppStart (Form1 As Form, Args() As String)
    MainForm = Form1
    MainForm.RootPane.LoadLayout("Layout1")
    MainForm.Show
   
    Dim jo As JavaObject = Me
    Dim inPDFPath As String= File.Combine(File.DirApp,"test.pdf")
 
    Dim outPDFPath As String= File.Combine(File.DirApp,"modified.pdf")
   
    Dim imgPath As String= File.Combine(File.DirApp,"SampleJPG.jpg")
    Dim pageNo As Int = 0
    jo.RunMethod("InsertingImageInPdf",Array(inPDFPath,outPDFPath,imgPath, pageNo))
   
End Sub



#if Java
import java.io.File;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDPage;
import org.apache.pdfbox.pdmodel.PDPageContentStream;
import org.apache.pdfbox.pdmodel.graphics.image.PDImageXObject;


   public static void InsertingImageInPdf(String inpPDFFile, String outpPDFFile, String imgFile, int pageNumber) throws Exception {
     
      //Loading an existing document
      File file = new File(inpPDFFile);
      PDDocument doc = PDDocument.load(file);

      //Retrieving the page
      PDPage page = doc.getPage(pageNumber);

      //Creating PDImageXObject object
      PDImageXObject pdImage = PDImageXObject.createFromFile(imgFile, doc);

      //creating the PDPageContentStream object
      PDPageContentStream contents = new PDPageContentStream(doc, page);

      //Drawing the image in the PDF document. The numbers are the coordinates, width and height of the image
      contents.drawImage(pdImage, 10, 650,100,100);    
      System.out.println("Image inserted");

      //Closing the PDPageContentStream object
      contents.close();      

      //Saving the document
      doc.save(outpPDFFile);
     
      //Closing the document
      doc.close();
   }
 


#End If

#if java
    PDPageContentStream contents = new PDPageContentStream(doc, page);
#end if

#if java
    PDPageContentStream contents = new PDPageContentStream(doc, page, true, true);
#end if