将IFrame的src属性设置为data:application / pdf; base64?

时间:2009-06-24 15:01:37

标签: asp.net pdf iframe base64

将IFrame的src属性设置为data:application / pdf; base64,对我来说不起作用,任何想法为什么?

这是.aspx标记

<%@ Page Language="C#" AutoEventWireup="true"  CodeFile="Default.aspx.cs" Inherits="_Default" %>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Untitled Page</title>
    <script type="text/javascript">
        function loadIFrameFromHiddenField()
        {         
            //get the node containing the base64 pdf data from the xml in the hidden field
            var xmlDoc = new ActiveXObject("Microsoft.XMLDOM");
            xmlDoc.loadXML(document.getElementById("pdfData").value);                    
            xmlDoc.setProperty('SelectionLanguage', 'XPath');
            var pdfDataNode = xmlDoc.selectSingleNode("//PDF");

            //if we've got the node
            if (pdfDataNode != null) 
            {
                //get the data and append it to the src contents 
                var pdfIFrameSrc = "data:application/pdf;base64," + pdfDataNode.text;
                //set the src attribute
                document.getElementById("pdfIFrame").setAttribute("src", pdfIFrameSrc);
            }            
        }
    </script>
</head>
<body>
    <form id="form1" runat="server" style="width:100%;height:100%;">
        <asp:HiddenField ID="pdfData" runat="server" /> 
        <div style="width:100%;height:80%;"> 
            <iframe id="pdfIFrame" runat="server" scrolling="auto" frameborder="0" marginheight="0" marginwidth="0" style="height:99.5%;width:99.5%" />            
        </div>
    </form>
</body>
</html>

这是背后的代码:

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.IO;
using System.Text;
using System.Xml;
public partial class _Default : System.Web.UI.Page 
{
    protected void Page_Load(object sender, EventArgs e)
    {

        //get the bytes from our PDF
        Byte[] pdfBytes = File.ReadAllBytes("c:\\temp\\Test.pdf");

        //build xml containiing our base64 encoded pdf data and put it in hidden field
        pdfData.Value = buildDocumentXML(pdfBytes, "TestDoc");

        //call js function to add the src to the iframe
        String scriptText = "<script type='text/javascript'>loadIFrameFromHiddenField()</script>";
        ClientScript.RegisterStartupScript(this.GetType(), "loadIFrameFromHiddenField", scriptText);
    }

    private string buildDocumentXML(Byte[] pdfBytes, string documentName) 
    {

        StringBuilder documentsString = new StringBuilder();
        XmlWriterSettings documentsXmlSettings = new XmlWriterSettings();

        documentsXmlSettings.Indent = false;            
        documentsXmlSettings.OmitXmlDeclaration = true;
        documentsXmlSettings.ConformanceLevel = ConformanceLevel.Fragment;
        documentsXmlSettings.NewLineHandling = NewLineHandling.None;

        using (XmlWriter documentsXmlWriter = XmlWriter.Create(documentsString, documentsXmlSettings))
        {

            documentsXmlWriter.WriteStartElement("DOCUMENTS");

            documentsXmlWriter.WriteStartElement("FILENAME");
            documentsXmlWriter.WriteString(documentName);
            documentsXmlWriter.WriteEndElement();

            documentsXmlWriter.WriteStartElement("PDF");


            documentsXmlWriter.WriteBase64(pdfBytes, 0, pdfBytes.Length);


            documentsXmlWriter.WriteEndElement();



            documentsXmlWriter.WriteEndElement();
        }



        return documentsString.ToString();

    }

}

我应该说,与此示例不同,在真实的应用程序中,pdf数据是在服务器端生成的。我试图加载pdf数据客户端的原因是我必须使用pdf字节数据客户端来执行其他操作,并且我正在尝试减少生成和隐藏的数据的实例。

将上述代码和标记粘贴到VS2005中的一个简单的单页网站中,并将任何旧的pdf粘贴到c:\ temp \中,将其称为TestDoc.pdf,它应该编译并运行。

基本上我得到的行为在iframe中根本就没有。

我正在使用IE7,这可能是个问题。我不知道,因为关于使用数据:application / pdf; base64 [base64 data]语法的信息很少。

3 个答案:

答案 0 :(得分:1)

引用维基百科可能会很俗气,但是Wikipdia says可能会对哪些文件类型允许使用数据有一些限制:filetype; base64语法。也就是说,现在只有图片。文章说,IE9规范允许更广泛的使用,但我不确定究竟是什么需要。与此同时,您只需使用.pdf文件,而不仅仅是它的基本64字符串数据。

答案 1 :(得分:0)

这种方式对我有用:

var oldsrc = $('.content-control-iframe').attr('src');
var newsrc = $('.content-control-iframe').attr('src').slice(8);
$('.content-control-iframe[src="'+oldsrc+'"]').attr('src', newsrc);

答案 2 :(得分:-1)

据我所知,IE根本不处理数据:URL方案,所以我猜,它不知道传递给PDF查看器的内容。请参阅WP

干杯,