流媒体使用iTextSharp的pdf文件到用户的浏览器 [英] Streaming a pdf to the user's browser using itextsharp

问题描述

我试图按照此文章在这里： HTTP：//www.4guysfromrolla。 COM /用品/ 030911-1.aspx

I'm trying to follow this article here: http://www.4guysfromrolla.com/articles/030911-1.aspx

我在Services.asmx此方法：

I have this method in Services.asmx:

[WebMethod]
public void CreatePdf()
{
    // Create a Document object
    var document = new Document(PageSize.A4, 50, 50, 25, 25);

    // Create a new PdfWriter object, specifying the output stream
    var output = new MemoryStream();
    var writer = PdfWriter.GetInstance(document, output);

    // Open the Document for writing
    document.Open();

    // Create a new Paragraph object with the text, "Hello, World!"
    var welcomeParagraph = new Paragraph("Hello, World!");

    // Add the Paragraph object to the document
    document.Add(welcomeParagraph);

    // Close the Document - this saves the document contents to the output stream
    document.Close();

    HttpContext.Current.Response.ContentType = "application/pdf";
    HttpContext.Current.Response.AddHeader("Content-Disposition",
        "attachment;filename=file.pdf");
    HttpContext.Current.Response.BinaryWrite(output.ToArray());        
}

和我的网页上这个jQuery code：

And this jQuery code on my page:

$('a.download').click(function () {

    $.ajax({
        type: "POST",
        url: "/Services.asmx/CreatePdf",
        data: '{}',
        contentType: "application/json; charset=utf-8",
        dataType: "json",
        success: function (result) {
            alert(result.d);
        }
    });
});

这应该创建一个PDF文件，并​​传输到用户的浏览器。

This is supposed to create a pdf and stream it to the user's browser.

当我点击与类的链接下载，我的Web方法被击中和code运行。它只是不流了PDF浏览器。

When I click on a link with the class download, my web method gets hit and the code runs. It just doesn't stream the pdf to the browser.

如果我在看萤火虫，它发布到我的方法与状态200，而我得到这个答复：

If I look in Firebug, it posts to my method with status 200, and I get this Response:

％PDF-1.4
  ％
  2 0 OBJ
  ＆LT;>流
  X + - [R
  25P04WI2P51BҸ4>>> /目录2 0 R / 3父0 R >>
  endobj
  1 0 OBJ
  ＆LT;>
  endobj
  3 0 OBJ
  ＆LT;>
  endobj
  5 0 OBJ
  ＆LT;>
  endobj
  6 0 OBJ
  ＆LT;>
  endobj
  外部参照
  0 7
  0000000000 65535˚F
  0000000304 00000ñ
  0000000015 00000ñ
  0000000392 00000ñ
  0000000147 00000ñ
  0000000443 00000ñ
  0000000488 00000ñ
  拖车
  ＆LT;＆LT; 21ba8d519bb56a2d0ec514bcb9c47169>] >>
  ％iText的-5.3.5
  startxref
  646
  %% EOF
  {D：空}

%PDF-1.4 %���� 2 0 obj <>stream x�+�r �25P�04WI�2P�5��1���BҸ4>>>/Contents 2 0 R/Parent 3 0 R>> endobj 1 0 obj <> endobj 3 0 obj <> endobj 5 0 obj <> endobj 6 0 obj <> endobj xref 0 7 0000000000 65535 f 0000000304 00000 n 0000000015 00000 n 0000000392 00000 n 0000000147 00000 n 0000000443 00000 n 0000000488 00000 n trailer <<21ba8d519bb56a2d0ec514bcb9c47169>]>> %iText-5.3.5 startxref 646 %%EOF {"d":null}

难道我做错了吗？

推荐答案

马克·B是正确的。你需要有服务器端code与PDF输出流响应。

Marc B is correct. You need to have your server-side code respond with the pdf output stream.

所以，将您的下载链接到一个新的文件，说PDFDownload.aspx，并将code从CreatePdf功能PDFDownload.aspx.cs的pageLoad的。

So, point your download link to a new file, say PDFDownload.aspx, and place the code from your CreatePdf function in the PageLoad of PDFDownload.aspx.cs.

这篇关于流媒体使用iTextSharp的pdf文件到用户的浏览器的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！