c#-如何在一个pdf中合并.pdf和.jpg文件

磁盘.jpg和.pdf上有两个文件,我需要读取两个文件并将它们添加到新的pdf中并发送到浏览器以便可以下载.

新的pdf文件仅包含pdf内容,而不包含jpeg文件图像.

          memoryStream myMemoryStream = new MemoryStream();

        //----pdf file--------------

        iTextSharp.text.pdf.PdfCopy writer2 = new iTextSharp.text.pdf.PdfCopy(doc, myMemoryStream);

        doc.Open();

        iTextSharp.text.pdf.PdfReader reader = new iTextSharp.text.pdf.PdfReader(imagepath + "/30244.pdf");
        reader.ConsolidateNamedDestinations();

        for (int i = 1; i <= reader.NumberOfPages; i++) {
            iTextSharp.text.pdf.PdfImportedPage page = writer2.GetImportedPage(reader, i);
            writer2.AddPage(page);
        }

        iTextSharp.text.pdf.PRAcroForm form = reader.AcroForm;
        if (form != null) {
            writer2.CopyAcroForm(reader);
        }

        //-----------------jpeg file-------------------------------------
        MemoryStream myMemoryStream2 = new MemoryStream();
        System.Drawing.Image image = System.Drawing.Image.FromFile(imagepath + "/Vouchers.jpg");
        iTextSharp.text.Document doc2 = new iTextSharp.text.Document(iTextSharp.text.PageSize.A4);
        iTextSharp.text.pdf.PdfWriter.GetInstance(doc2, myMemoryStream2);
        doc2.Open();
        iTextSharp.text.Image pdfImage = iTextSharp.text.Image.GetInstance(image, System.Drawing.Imaging.ImageFormat.Jpeg);

       doc2.Add(pdfImage);

       doc2.close();
       doc.close();

        byte[] content = myMemoryStream.ToArray;

        Response.ContentType = "application/pdf";
        Response.AppendHeader("Content-Disposition", "attachment; filename=LeftCorner568.pdf");
        Response.BinaryWrite(content);

解决方法:

既然您已经遇到了一段时间的麻烦,现在我将给您一个长期的答复,希望对您有所帮助.

首先,我无权访问ASP.Net服务器,因此我正在运行桌面上的文件夹中的所有内容.因此,您将看到我在Environment.GetFolderPath(Environment.SpecialFolder.Desktop)中工作,而不是从相对路径中读取和写入.我假设您以后可以交换路径.

其次,(并不是那么重要)我没有SSRS,所以我创建了一个帮助程序方法,该方法可以使我使用伪造的PDF,并以字节数组的形式返回PDF:

/// <summary>
/// Create a fake SSRS report
/// </summary>
/// <returns>A valid PDF stored as a byte array</returns>
private Byte[] getSSRSPdfAsByteArray() {
    using (var ms = new System.IO.MemoryStream()) {
        using (var doc = new Document()) {
            using (var writer = PdfWriter.GetInstance(doc, ms)) {
                doc.Open();
                doc.Add(new Paragraph("This is my SSRS report"));
                doc.Close();
            }
        }

        return ms.ToArray();
    }
}

第三,只是为了使我们在同一页面上并且可以一起工作,我创建了两个附加的辅助方法,这些方法可以生成一些示例图像和PDF:

/// <summary>
/// Create sample images in the folder provided
/// </summary>
/// <param name="count">The number of images to create</param>
/// <param name="workingFolder">The folder to create images in</param>
private void createSampleImages(int count, string workingFolder) {
    var random = new Random();
    for (var i = 0; i < count; i++) {
        using (var bmp = new System.Drawing.Bitmap(200, 200)) {
            using (var g = System.Drawing.Graphics.FromImage(bmp)) {
                g.Clear(Color.FromArgb(random.Next(0, 255), random.Next(0, 255), random.Next(0, 255)));
            }
            bmp.Save(System.IO.Path.Combine(workingFolder, string.Format("Image_{0}.jpg", i)));
        }
    }
}

/// <summary>
/// Create sample PDFs in the folder provided
/// </summary>
/// <param name="count">The number of PDFs to create</param>
/// <param name="workingFolder">The folder to create PDFs in</param>
private void createSamplePDFs(int count, string workingFolder) {
    var random = new Random();
    for (var i = 0; i < count; i++) {
        using (var ms = new System.IO.MemoryStream()) {
            using (var doc = new Document()) {
                using (var writer = PdfWriter.GetInstance(doc, ms)) {
                    doc.Open();
                    var pageCount = random.Next(1, 10);
                    for (var j = 0; j < pageCount; j++) {
                        doc.NewPage();
                        doc.Add(new Paragraph(String.Format("This is page {0} of document {1}", j, i)));
                    }
                    doc.Close();
                }
            }

            System.IO.File.WriteAllBytes(System.IO.Path.Combine(workingFolder, string.Format("File_{0}.pdf", i)), ms.ToArray());
        }
    }
}

重申一下,您显然不需要这三种辅助方法,它们只是为了使您和我拥有一组通用的文件.这些辅助方法也没有刻意评论.

第四,在下面的代码末尾,我将最终的PDF存储到一个名为finalFileBytes的字节数组中,然后将其写入磁盘.再一次,我在桌面上工作,因此您将在这里执行Response.BinaryWrite(finalFileBytes).

第五,有多种合并和合并文件的方法. PdfCopy,PdfSmartCopy和PdfStamper都是常用的.我鼓励您阅读official iText/iTextSharp book或至少免费的第6章,使用现有的PDF,其中对此进行了详细介绍.在下面的代码中,我正在使用PdfSmartCopy,并且在导入每个图像之前将其转换为PDF.也许有更好的方法,但是我不确定是否可以一次性完成所有操作.布鲁诺会比我更了解.但是下面的作品.

有关正在发生的事情的更多详细信息,请参见单独的代码注释.

//The folder that all of our work will be done in
var workingFolder = System.IO.Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.Desktop), "Pdf Test");

//This is the final PDF that we'll create for testing purposes
var finalPDF = System.IO.Path.Combine(workingFolder, "test.pdf");

//Create our working directory if it doesn't exist already
System.IO.Directory.CreateDirectory(workingFolder);

//Create sample PDFs and images
createSampleImages(10, workingFolder);
createSamplePDFs(10, workingFolder);

//Create our sample SSRS PDF byte array
var SSRS_Bytes = getSSRSPdfAsByteArray();

//This variable will eventually hold our combined PDF as a byte array
Byte[] finalFileBytes;

//Write everything to a MemoryStream
using (var finalFile = new System.IO.MemoryStream()) {

    //Create a generic Document
    using (var doc = new Document()) {

        //Use PdfSmartCopy to intelligently merge files
        using (var copy = new PdfSmartCopy(doc, finalFile)) {

            //Open our document for writing
            doc.Open();

            //#1 - Import the SSRS report

            //Bind a reader to our SSRS report
            using (var reader = new PdfReader(SSRS_Bytes)) {

                //Loop through each page
                for (var i = 1; i <= reader.NumberOfPages; i++) {

                    //Add the imported page to our final document
                    copy.AddPage(copy.GetImportedPage(reader, i));
                }
            }

            //#2 - Image the images

            //Loop through each image in our working directory
            foreach (var f in System.IO.Directory.EnumerateFiles(workingFolder, "*.jpg", SearchOption.TopDirectoryOnly)) {

                //There's different ways to do this and it depends on what exactly "add an image to a PDF" really means
                //Below we add each individual image to a PDF and then merge that PDF into the main PDF
                //This could be optimized greatly

                //From https://alandjackson.wordpress.com/2013/09/27/convert-an-image-to-a-pdf-in-c-using-itextsharp/

                //Get the size of the current image
                iTextSharp.text.Rectangle pageSize = null;
                using (var srcImage = new Bitmap(f)) {
                    pageSize = new iTextSharp.text.Rectangle(0, 0, srcImage.Width, srcImage.Height);
                }

                //Will eventually hold the PDF with the image as a byte array
                Byte[] imageBytes;

                //Simple image to PDF
                using (var m = new MemoryStream()) {
                    using (var d = new Document(pageSize, 0, 0, 0, 0)) {
                        using (var w = PdfWriter.GetInstance(d, m)) {
                            d.Open();
                            d.Add(iTextSharp.text.Image.GetInstance(f));
                            d.Close();
                        }
                    }

                    //Grab the bytes before closing out the stream
                    imageBytes = m.ToArray();
                }

                //Now merge using the same merge code as #1
                using (var reader = new PdfReader(imageBytes)) {
                    for (var i = 1; i <= reader.NumberOfPages; i++) {
                        copy.AddPage(copy.GetImportedPage(reader, i));
                    }
                }
            }

            //#3 - Merge additional PDF

            //Look for each PDF in our working directory
            foreach (var f in System.IO.Directory.EnumerateFiles(workingFolder, "*.pdf", SearchOption.TopDirectoryOnly)) {

                //Because I'm writing samples files to disk but not cleaning up afterwards
                //I want to avoid adding my output file as an input file
                if (f == finalPDF) {
                    continue;
                }

                //Now merge using the same merge code as #1
                using (var reader = new PdfReader(f)) {
                    for (var i = 1; i <= reader.NumberOfPages; i++) {
                        copy.AddPage(copy.GetImportedPage(reader, i));
                    }
                }
            }

            doc.Close();
        }
    }

    //Grab the bytes before closing the stream
    finalFileBytes = finalFile.ToArray();
}

//At this point finalFileBytes holds a byte array of a PDF
//that contains the SSRS PDF, the sample images and the
//sample PDFs. For demonstration purposes I'm just writing to
//disk but this could be written to the HTTP stream
//using Response.BinaryWrite()

System.IO.File.WriteAllBytes(finalPDF, finalFileBytes);
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