流式PDF到网页失败 [英] Stream a PDF to a web page failing

问题描述

我有一个网址为PDF，我想的PDF为多达我的网页浏览器。

我能成功（我认为）检索的PDF文件。然后，当我做Response.BinaryWrite（）我得到一个文件已损坏，无法修复请从Adobe Reader的错误。

这里的code我有：

 保护无效的Page_Load（对象发件人，EventArgs的发送）
    {
        如果（的IsPostBack）
        {
            字节[] =输出DoWork的（宀：//localhost/test.pdf）;
            Response.Clear（）;
            Response.ContentType =应用程序/ PDF
            Response.AddHeader（内容处置，内联;文件名= MyPDF.PDF）;
            Response.AddHeader（内容长度，output.Length.ToString（））;
            Response.BinaryWrite（输出）;
            到Response.End（）;
        }
    }    公共字节[]的DoWork（字符串requestUrl）
    {
        字节[] responseData;
        HttpWebRequest的REQ = NULL;
        HttpWebResponse RESP = NULL;
        StreamReader的strmReader = NULL;        尝试
        {
            REQ =（HttpWebRequest的）WebRequest.Create（requestUrl）;            使用（RESP =（HttpWebResponse）req.GetResponse（））
            {
                字节[]缓冲区=新的字节[resp.ContentLength]
                BinaryReader读者=新BinaryReader（resp.GetResponseStream（））;
                reader.Read（缓冲液，0，buffer.Length）;
                responseData =缓冲;
            }
        }
        最后
        {
            如果（REQ！= NULL）
            {
                REQ = NULL;
            }            如果（RESP！= NULL）
            {
                resp.Close（）;
                RESP = NULL;
            }
        }        返回responseData;    }
 

解决方案

显然，我需要使用的ReadBytes（）出于某种原因，从URL阅读PDF文件时，你没有得到所有你所要求的字节

 保护无效的Page_Load（对象发件人，EventArgs的发送）
    {
        如果（的IsPostBack）
        {
            字节[] =输出DoWork的（宀：//localhost/test.pdf）;
            Response.Clear（）;
            Response.ContentType =应用程序/ PDF
            Response.AddHeader（内容处置，附件）;
            Response.AddHeader（内容长度，output.Length.ToString（））;
            Response.BinaryWrite（输出）;
            到Response.End（）;
        }
    }    公共字节[]的DoWork（字符串requestUrl）
    {
        字节[] responseData;
        HttpWebRequest的REQ = NULL;
        HttpWebResponse RESP = NULL;
        StreamReader的strmReader = NULL;        尝试
        {
            REQ =（HttpWebRequest的）WebRequest.Create（requestUrl）;            使用（RESP =（HttpWebResponse）req.GetResponse（））
            {
                字节[]缓冲区=新的字节[resp.ContentLength]
                使用（BinaryReader读卡器=新BinaryReader（resp.GetResponseStream（）））
                {
                    缓冲= reader.ReadBytes（buffer.Length）;
                    reader.Close（）;
                }
                responseData =缓冲;
            }
        }
        最后
        {
            如果（REQ！= NULL）
            {
                REQ = NULL;
            }            如果（RESP！= NULL）
            {
                resp.Close（）;
                RESP = NULL;
            }
        }        返回responseData;    }
 

I have a URL to a PDF and I want to serve up the PDF to my page viewer.

I can successfully (I think) retrieve the PDF file. Then when I do the Response.BinaryWrite() I get a "The file is damaged and could not be repaired" error from the adobe reader.

Here's the code I have:

protected void Page_Load(object sender, EventArgs e)
    {
        if (IsPostBack)
        {
            byte[] output = DoWork("Http://localhost/test.pdf");
            Response.Clear();
            Response.ContentType = "application/pdf";
            Response.AddHeader("content-disposition", "inline; filename=MyPDF.PDF");
            Response.AddHeader("content-length", output.Length.ToString());
            Response.BinaryWrite(output);
            Response.End();
        }
    }

    public byte[] DoWork(string requestUrl)
    {
        byte[] responseData;
        HttpWebRequest req = null;
        HttpWebResponse resp = null;
        StreamReader strmReader = null;

        try
        {
            req = (HttpWebRequest)WebRequest.Create(requestUrl);

            using (resp = (HttpWebResponse)req.GetResponse())
            {
                byte[] buffer = new byte[resp.ContentLength];
                BinaryReader reader = new BinaryReader(resp.GetResponseStream());
                reader.Read(buffer, 0, buffer.Length);
                responseData = buffer;
            }
        }
        finally
        {
            if (req != null)
            {
                req = null;
            }

            if (resp != null)
            {
                resp.Close();
                resp = null;
            }
        }

        return responseData;

    }

解决方案

Apparently, I need to use ReadBytes() For some reason, when reading a PDF from a URL, You don't get all of the bytes that you requested.

    protected void Page_Load(object sender, EventArgs e)
    {
        if (IsPostBack)
        {
            byte[] output = DoWork("Http://localhost/test.pdf");
            Response.Clear();
            Response.ContentType = "application/pdf";
            Response.AddHeader("content-disposition", "attachment");
            Response.AddHeader("content-length", output.Length.ToString());
            Response.BinaryWrite(output);
            Response.End();
        }
    }

    public byte[] DoWork(string requestUrl)
    {
        byte[] responseData;
        HttpWebRequest req = null;
        HttpWebResponse resp = null;
        StreamReader strmReader = null;

        try
        {
            req = (HttpWebRequest)WebRequest.Create(requestUrl);

            using (resp = (HttpWebResponse)req.GetResponse())
            {
                byte[] buffer = new byte[resp.ContentLength];
                using (BinaryReader reader = new BinaryReader(resp.GetResponseStream()))
                {
                    buffer = reader.ReadBytes(buffer.Length);
                    reader.Close();
                }
                responseData = buffer;
            }
        }
        finally
        {
            if (req != null)
            {
                req = null;
            }

            if (resp != null)
            {
                resp.Close();
                resp = null;
            }
        }

        return responseData;

    }

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