c#-如何在一个pdf中合并.pdf和.jpg文件
作者：互联网
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);
标签：pdf,itextsharp,asp-net,c 来源： https://codeday.me/bug/20191119/2038521.html