用程式自動替換PDF檔案中的圖像

要使用Java代碼，應該調用iText庫。

要使用C#代碼，應該調用iTextSharp庫。

Here's the code to replace images in PDFs, in Java and C#. It will replace the first image in the first page.

Java代碼

PdfReader pdf = new PdfReader("in.pdf");

PdfStamper stp = new PdfStamper(pdf, new FileOutputStream("c:\\out.pdf"));

PdfWriter writer = stp.getWriter();

Image img = Image.getInstance("image.png");

PdfDictionary pg = pdf.getPageN(1);

PdfDictionary res =

    (PdfDictionary)PdfReader.getPdfObject(pg.get(PdfName.RESOURCES));

PdfDictionary xobj =

    (PdfDictionary)PdfReader.getPdfObject(res.get(PdfName.XOBJECT));

if (xobj != null) {

    for (Iterator it = xobj.getKeys().iterator(); it.hasNext(); ) {

        PdfObject obj = xobj.get((PdfName)it.next());

        if (obj.isIndirect()) {

            PdfDictionary tg = (PdfDictionary)PdfReader.getPdfObject(obj);

            PdfName type =

                (PdfName)PdfReader.getPdfObject(tg.get(PdfName.SUBTYPE));

            if (PdfName.IMAGE.equals(type)) {

                PdfReader.killIndirect(obj);

                Image maskImage = img.getImageMask();

                if (maskImage != null)

                    writer.addDirectImageSimple(maskImage);

                writer.addDirectImageSimple(img, (PRIndirectReference)obj);

                break;

            }

        }

    }

}

stp.close();

C#代碼：

PdfStamper stp = new PdfStamper(pdf, new FileStream("out.pdf",

FileMode.Create));

PdfWriter writer = stp.Writer;

Image img = Image.GetInstance("image.png");

PdfDictionary pg = pdf.GetPageN(1);

    (PdfDictionary)PdfReader.GetPdfObject(pg.Get(PdfName.RESOURCES));

    (PdfDictionary)PdfReader.GetPdfObject(res.Get(PdfName.XOBJECT));

    foreach (PdfName name in xobj.Keys) {

        PdfObject obj = xobj.Get(name);

        if (obj.IsIndirect()) {

            PdfDictionary tg = (PdfDictionary)PdfReader.GetPdfObject(obj);

                (PdfName)PdfReader.GetPdfObject(tg.Get(PdfName.SUBTYPE));

            if (PdfName.IMAGE.Equals(type)) {

            PdfReader.KillIndirect(obj);

            Image maskImage = img.ImageMask;

            if (maskImage != null)

                writer.AddDirectImageSimple(maskImage);

                writer.AddDirectImageSimple(img, PRIndirectReference)obj);

stp.Close();

本文轉自 h2appy  51CTO部落格，原文連結：http://blog.51cto.com/h2appy/149127，如需轉載請自行聯系原作者