Re: System.Net.WebClient.DownloadFile doesn't work with http attachments

Hi Alan,

Yes, I know the serverside code won't have big difference , nor does the
client code. That's why I think this should be a environment specific
issue. Here is the client code I've used to test , (both use WebClient and
HttpWebRequest ....) , the code work correctly on my test environment.

=========================
static void Main(string[] args)
{


DownloadByWebClient();


DownloadByHttpWebRequest();
}

static void DownloadByWebClient()
{
string url =
"http://localhost/StevenRoot/ControlWebApp/filedownload.aspx";;
string clientfile = @"d:\temp\test_webclient.pdf";

WebClient wc = new WebClient();

wc.DownloadFile(url,clientfile);

}

static void DownloadByHttpWebRequest()
{
string url =
"http://localhost/StevenRoot/ControlWebApp/filedownload.aspx";;
string clientfile = @"d:\temp\test_webrequest.pdf";

HttpWebRequest req = WebRequest.Create(url) as HttpWebRequest;

req.Method = "GET";
req.KeepAlive = true;

HttpWebResponse rep = req.GetResponse() as HttpWebResponse;

Stream stream = rep.GetResponseStream();

FileStream fs = new FileStream(clientfile, FileMode.Create,
FileAccess.Write);

byte[] buf = new byte[1024];

int i = 0;

while( (i=stream.Read(buf,0,buf.Length))> 0)
{
fs.Write(buf,0,i);
}

fs.Close();

stream.Close();

rep.Close();

}
============================

In addition, you can also try comment the below line in your serverside
code to see whether it helps:

Response.AppendHeader("Content-Disposition", "attachment;filename=" +
fileID.ToString() + ".pdf");

Thanks,

Steven Cheng
Microsoft Online Support

Get Secure! www.microsoft.com/security
(This posting is provided "AS IS", with no warranties, and confers no
rights.)

--------------------
| From: "A.M-SG" <alanalan@xxxxxxxxxxxxxxxx>
| References: <#Nwo3Un3FHA.3600@xxxxxxxxxxxxxxxxxxxx>
<CXg1MTu3FHA.3220@xxxxxxxxxxxxxxxxxxxxx>
| Subject: Re: System.Net.WebClient.DownloadFile doesn't work with http
attachments
| Date: Tue, 1 Nov 2005 08:15:42 -0500
| Lines: 124
| X-Priority: 3
| X-MSMail-Priority: Normal
| X-Newsreader: Microsoft Outlook Express 6.00.3790.1830
| X-RFC2646: Format=Flowed; Original
| X-MimeOLE: Produced By Microsoft MimeOLE V6.00.3790.1830
| Message-ID: <#Hcn3Yu3FHA.2816@xxxxxxxxxxxxxxxxxxxx>
| Newsgroups: microsoft.public.dotnet.languages.csharp
| NNTP-Posting-Host: toronto-hse-ppp4253404.sympatico.ca 70.52.252.114
| Path: TK2MSFTNGXA01.phx.gbl!TK2MSFTNGP08.phx.gbl!tk2msftngp13.phx.gbl
| Xref: TK2MSFTNGXA01.phx.gbl
microsoft.public.dotnet.languages.csharp:133123
| X-Tomcat-NG: microsoft.public.dotnet.languages.csharp
|
| Hi Steven,
|
| Firstly thank you for your reply.
|
| The code that you provided is not my question.
|
| My question is: "How to receive that pdf file at the client side?"
|
| The server side is done and it is similar to what you mentioned in your
| reply.
|
| I tried to receive the pdf file (test.pdf in your sample) by using
| System.Net.WebClient.DownloadFile, but it throws exception.
|
| Regards,
| Alan
|
|
|
| "Steven Cheng[MSFT]" <stcheng@xxxxxxxxxxxxxxxxxxxx> wrote in message
| news:CXg1MTu3FHA.3220@xxxxxxxxxxxxxxxxxxxxxxxx
| > Hi Alan,
| >
| > Welcome to MSDN newsgroup.
| > Regarding on the file downloading through WebClient class problem you
| > mentioned, seems a bit strange from a general view. It is possible a
| > machine specific issue. here is a test page's code which could be
| > correctly
| > used (let client user webbrowser or webclient class to download the
file)
| > on my side:
| >
| > ==================
| > private void Page_Load(object sender, System.EventArgs e)
| > {
| > Response.ClearHeaders();
| > Response.ClearContent();
| > Response.ContentType = "application/octet-stream";
| >
| >
Response.AppendHeader("Content-Disposition","attachment;filename=test.pdf");
| >
| > Response.WriteFile(Server.MapPath("~/files/test.pdf"));
| >
| > Response.End();
| > }
| > ==================
| >
| > You can try the above code in your page to see whether it works. Also,
you
| > can run the webclient from multiple client to see whether it is client
| > specific.
| >
| > Thanks,
| >
| > Steven Cheng
| > Microsoft Online Support
| >
| > Get Secure! www.microsoft.com/security
| > (This posting is provided "AS IS", with no warranties, and confers no
| > rights.)
| >
| >
| >
| >
| > --------------------
| > | From: "A.M-SG" <alanalan@xxxxxxxxxxxxxxxx>
| > | Subject: System.Net.WebClient.DownloadFile doesn't work with http
| > attachments
| > | Date: Mon, 31 Oct 2005 18:45:48 -0500
| > | Lines: 35
| > | X-Priority: 3
| > | X-MSMail-Priority: Normal
| > | X-Newsreader: Microsoft Outlook Express 6.00.2900.2180
| > | X-RFC2646: Format=Flowed; Original
| > | X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180
| > | Message-ID: <#Nwo3Un3FHA.3600@xxxxxxxxxxxxxxxxxxxx>
| > | Newsgroups: microsoft.public.dotnet.languages.csharp
| > | NNTP-Posting-Host: hse-toronto-ppp3484752.sympatico.ca 65.92.97.129
| > | Path: TK2MSFTNGXA01.phx.gbl!TK2MSFTNGP08.phx.gbl!TK2MSFTNGP12.phx.gbl
| > | Xref: TK2MSFTNGXA01.phx.gbl
| > microsoft.public.dotnet.languages.csharp:133060
| > | X-Tomcat-NG: microsoft.public.dotnet.languages.csharp
| > |
| > | Hi,
| > |
| > | I have an aspx page at the web server that provides PDF documents for
| > smart
| > | client applications.
| > |
| > | Here is the code in aspx page that defines content type:
| > |
| > | Response.ContentType = "application/octet-stream";
| > | Response.AppendHeader("Content-Disposition", "attachment;filename=" +
| > | fileID.ToString() + ".pdf");
| > |
| > | I tested the aspx page by using browser and it works just fine.
| > |
| > | Now I need to receive that file by using the
| > | System.Net.WebClient.DownloadFile. The problem is that DownloadFile
| > method
| > | returns the following exception:
| > |
| > | "Unable to read data from the transport connection: The connection was
| > | closed."
| > |
| > | I tested the DownloadFile method to open a direct pdf file like the
| > | following statement:
| > |
| > | (new
| > |
| >
System.Net.WebClient()).DownloadFile(http://localhost/test.pdf,"c:\\test.pdf
| > ");
| > |
| > | It works just fine.
| > |
| > | How can I use System.Net.WebClient. DownloadFile to download http
| > | attachments?
| > |
| > | Any help would be apprecited,
| > | Alan
| > |
| > |
| > |
| >
|
|
|

.

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