C# 使用Itext从pdf中提取图像

我一直在使用ITEXT函数从pdf文件中读取简单文本，但是否可以使用C#中的ITEXT从pdf文件中读取图像

 using iTextSharp.text;
 using iTextSharp.text.pdf;

    public static void ExtractImagesFromPDF(string sourcePdf, string outputPath)
    {
        // NOTE:  This will only get the first image it finds per page.
        PdfReader pdf = new PdfReader(sourcePdf);
        RandomAccessFileOrArray raf = new iTextSharp.text.pdf.RandomAccessFileOrArray(sourcePdf);
        try
        {
            for (int pageNumber = 1; pageNumber <= pdf.NumberOfPages; pageNumber++)
            {
                PdfDictionary pg = pdf.GetPageN(pageNumber);
                PdfDictionary res =
                  (PdfDictionary)PdfReader.GetPdfObject(pg.Get(PdfName.RESOURCES));
                PdfDictionary xobj =
                  (PdfDictionary)PdfReader.GetPdfObject(res.Get(PdfName.XOBJECT));
                if (xobj != null)
                {
                    foreach (PdfName name in xobj.Keys)
                    {
                        PdfObject obj = xobj.Get(name);
                        if (obj.IsIndirect())
                        {
                            PdfDictionary tg = (PdfDictionary)PdfReader.GetPdfObject(obj);
                            PdfName type =
                              (PdfName)PdfReader.GetPdfObject(tg.Get(PdfName.SUBTYPE));
                            if (PdfName.IMAGE.Equals(type))
                            {
                                int XrefIndex = Convert.ToInt32(((PRIndirectReference)obj).Number.ToString(System.Globalization.CultureInfo.InvariantCulture));
                                PdfObject pdfObj = pdf.GetPdfObject(XrefIndex);
                                PdfStream pdfStrem = (PdfStream)pdfObj;
                                byte[] bytes = PdfReader.GetStreamBytesRaw((PRStream)pdfStrem);
                                if ((bytes != null))
                                {
                                    using (System.IO.MemoryStream memStream = new System.IO.MemoryStream(bytes))
                                    {
                                        memStream.Position = 0;
                                        System.Drawing.Image img = System.Drawing.Image.FromStream(memStream);
                                        // must save the file while stream is open.
                                        if (!Directory.Exists(outputPath))
                                            Directory.CreateDirectory(outputPath);

                                        string path = Path.Combine(outputPath, String.Format(@"{0}.jpg", pageNumber));
                                        System.Drawing.Imaging.EncoderParameters parms = new System.Drawing.Imaging.EncoderParameters(1);
                                        parms.Param[0] = new                                      System.Drawing.Imaging.EncoderParameter(System.Drawing.Imaging.Encoder.Compression, 0);
      // GetImageEncoder is found below this method
                                        System.Drawing.Imaging.ImageCodecInfo jpegEncoder = GetImageEncoder("JPEG");
                                        img.Save(path, jpegEncoder, parms);
                                        break;
                                    }
                                }
                            }
                        }
                    }
                }
            }
        }
        catch
        {
            throw;
        }
        finally
        {
            pdf.Close();
        }
    }
    #endregion

   #region GetImageEncoder
    public static System.Drawing.Imaging.ImageCodecInfo GetImageEncoder(string imageType)
    {
        imageType = imageType.ToUpperInvariant();
        foreach (ImageCodecInfo info in ImageCodecInfo.GetImageEncoders())
        {
            if (info.FormatDescription == imageType)
            {
                return info;
            }
        }
        return null;
    }
    #endregion

使用iTextSharp.text；
使用iTextSharp.text.pdf；
公共静态void ExtractImagesFromPDF（字符串源PDF，字符串输出路径）
{
//注意：这将仅获取每页找到的第一个图像。
PdfReader pdf=新PdfReader（sourcePdf）；
RandomAccessFileOrArray raf=new iTextSharp.text.pdf.RandomAccessFileOrArray（sourcePdf）；
尝试
{
对于（int pageNumber=1；pageNumber您可以尝试以下内容

 using iTextSharp.text;
 using iTextSharp.text.pdf;

    public static void ExtractImagesFromPDF(string sourcePdf, string outputPath)
    {
        // NOTE:  This will only get the first image it finds per page.
        PdfReader pdf = new PdfReader(sourcePdf);
        RandomAccessFileOrArray raf = new iTextSharp.text.pdf.RandomAccessFileOrArray(sourcePdf);
        try
        {
            for (int pageNumber = 1; pageNumber <= pdf.NumberOfPages; pageNumber++)
            {
                PdfDictionary pg = pdf.GetPageN(pageNumber);
                PdfDictionary res =
                  (PdfDictionary)PdfReader.GetPdfObject(pg.Get(PdfName.RESOURCES));
                PdfDictionary xobj =
                  (PdfDictionary)PdfReader.GetPdfObject(res.Get(PdfName.XOBJECT));
                if (xobj != null)
                {
                    foreach (PdfName name in xobj.Keys)
                    {
                        PdfObject obj = xobj.Get(name);
                        if (obj.IsIndirect())
                        {
                            PdfDictionary tg = (PdfDictionary)PdfReader.GetPdfObject(obj);
                            PdfName type =
                              (PdfName)PdfReader.GetPdfObject(tg.Get(PdfName.SUBTYPE));
                            if (PdfName.IMAGE.Equals(type))
                            {
                                int XrefIndex = Convert.ToInt32(((PRIndirectReference)obj).Number.ToString(System.Globalization.CultureInfo.InvariantCulture));
                                PdfObject pdfObj = pdf.GetPdfObject(XrefIndex);
                                PdfStream pdfStrem = (PdfStream)pdfObj;
                                byte[] bytes = PdfReader.GetStreamBytesRaw((PRStream)pdfStrem);
                                if ((bytes != null))
                                {
                                    using (System.IO.MemoryStream memStream = new System.IO.MemoryStream(bytes))
                                    {
                                        memStream.Position = 0;
                                        System.Drawing.Image img = System.Drawing.Image.FromStream(memStream);
                                        // must save the file while stream is open.
                                        if (!Directory.Exists(outputPath))
                                            Directory.CreateDirectory(outputPath);

                                        string path = Path.Combine(outputPath, String.Format(@"{0}.jpg", pageNumber));
                                        System.Drawing.Imaging.EncoderParameters parms = new System.Drawing.Imaging.EncoderParameters(1);
                                        parms.Param[0] = new                                      System.Drawing.Imaging.EncoderParameter(System.Drawing.Imaging.Encoder.Compression, 0);
      // GetImageEncoder is found below this method
                                        System.Drawing.Imaging.ImageCodecInfo jpegEncoder = GetImageEncoder("JPEG");
                                        img.Save(path, jpegEncoder, parms);
                                        break;
                                    }
                                }
                            }
                        }
                    }
                }
            }
        }
        catch
        {
            throw;
        }
        finally
        {
            pdf.Close();
        }
    }
    #endregion

   #region GetImageEncoder
    public static System.Drawing.Imaging.ImageCodecInfo GetImageEncoder(string imageType)
    {
        imageType = imageType.ToUpperInvariant();
        foreach (ImageCodecInfo info in ImageCodecInfo.GetImageEncoders())
        {
            if (info.FormatDescription == imageType)
            {
                return info;
            }
        }
        return null;
    }
    #endregion

使用iTextSharp.text；
使用iTextSharp.text.pdf；
公共静态void ExtractImagesFromPDF（字符串源PDF，字符串输出路径）
{
//注意：这将仅获取每页找到的第一个图像。
PdfReader pdf=新PdfReader（sourcePdf）；
RandomAccessFileOrArray raf=new iTextSharp.text.pdf.RandomAccessFileOrArray（sourcePdf）；
尝试
{
对于（int pageNumber=1；pageNumberHi），这不是C#而是我的Java代码，我希望您可以使用它来提取C中的图像#

我知道这段代码是用Java编写的，但这是为了给大家一个大概的想法
嗨，这不是C#但我用Java编写的代码，我希望大家可以用它来提取C语言中的图像#

我知道这段代码是用Java编写的，但它是为了给你一个大概的想法
我认为OP需要用C#而不是Java来回答问题。我认为OP需要用C#来回答问题，而不是用Java来回答问题。这行代码似乎很有价值：
int XrefIndex=Convert.ToInt32（（（PRIndirectReference）obj.Number.ToString（System.Globalization.CultureInfo.InvariantCulture））；
这简直是一种疯狂的书写方式：
int-XrefIndex=（（PRIndirectReference）obj.Number；
这一行似乎很有价值：
int-XrefIndex=Convert.ToInt32（（PRIndirectReference）obj.Number.ToString（System.Globalization.CultureInfo.InvariantCulture））；
这只是一种疯狂的书写方式：
int-XrefIndex=（（PRIndirectReference）obj.Number；
public void renderImage(ImageRenderInfo renderInfo) {
    try {
        PdfImageObject image = renderInfo.getImage();
        if (image == null)
            return;
        ZipEntry entry = new ZipEntry(String.format(img, renderInfo
                .getRef().getNumber(), image.getFileType()));
        System.out.println(image.getFileType());
        zip.putNextEntry(entry);
        zip.write(image.getImageAsBytes());
        zip.closeEntry();
    } catch (IOException ioex) {
        ioex.printStackTrace();
    }
}