C#: write in a file at url with c#

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I write below code for write something in a file that uploaded in a url.

C#

HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://domain/filename");
HttpWebResponse Response = (HttpWebResponse)request.GetResponse();
Stream file=Response.GetResponseStream();
StreamWriter wr = new StreamWriter(file);
wr.WriteLine("salam");

but it have An unhandled exception in line

C#

StreamWriter wr = new StreamWriter(file);

can anybody help me?

Posted 31-Aug-14 21:02pm

Karim Pazoki

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Comments

Richard MacCutchan 1-Sep-14 3:12am

What is the value in file when the exception occurs?

Karim Pazoki 1-Sep-14 3:17am

I have an empty file in http://domain/filename
I wanna to write in it.

Richard MacCutchan 1-Sep-14 3:30am

Very interesting, but you still have not answered the question.

Karim Pazoki 1-Sep-14 3:54am

https://webdeveloper.box.com/s/qbt1itrhkie95o3qvmm7
this image show the values.

Richard MacCutchan 1-Sep-14 3:58am

No, it doesn't.

Karim Pazoki 1-Sep-14 4:26am

file is empty before and after exception and value that shown in picture are file variable values when exception occurs.

Richard MacCutchan 1-Sep-14 4:34am

What is the actual string value in the file variable, that is used to create the StreamWriter? See http://msdn.microsoft.com/en-us/library/wtbhzte9(v=vs.110).aspx for possible issues with your stream creation.

Karim Pazoki 1-Sep-14 4:49am

FileStream fs = new FileStream(fileName, FileMode.CreateNew)[msdn]
Stream file=Response.GetResponseStream()[me]
StreamWriter writer = new StreamWriter(fs)[msdn]
StreamWriter wr = new StreamWriter(file)[me]
writer.Write(textToAdd);[msdn]
wr.WriteLine("salam");[me]

what`s the problem ?!!!

Richard MacCutchan 1-Sep-14 4:57am

The problem is that you do not have a file. You need to ensure that at the time you get your response stream that it creates a valid file. The exception you see is telling you that it cannot create a file so you need to establish what it is in your code that is failing to create it. You should be able to verify all your variables at the time the exception is thrown. You should also be catching the exception, rather than leaving it to the system.

Karim Pazoki 1-Sep-14 5:02am

I have a file in server! I connect to it! I read from it! just I wanna to edit it. file is true and exception not because it. you think I create a local file? nope no!

Richard MacCutchan 1-Sep-14 6:00am

Your stream is not writable. See the exception details and the documentation for GetResponseStream.

vangapally Naveen Kumar 1-Sep-14 3:28am

stream file should have an extension.
see this link
http://msdn.microsoft.com/en-us/library/wtbhzte9(v=vs.110).aspx

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majid torfi · Answer 1 · 2014-08-31T21:24:00

Solution 2

C#

using System.IO;  // in head
using System.Net;

C#

private void button1_Click(object sender, EventArgs e)
 {
      string remoteFileUrl=@"http://img1.tebyan.net/big/1393/05/10815525515518876156213521208177619316289.jpg";  // or address
      string localFileName = @"C:\someImage.jpg";

     WebClient webClient = new WebClient();
     webClient.DownloadFile(remoteFileUrl, localFileName);
     StreamWriter wr = new StreamWriter(localFileName); // or appand=true
     wr.WriteLine("salam");
     wr.Close();
 }

Posted 31-Aug-14 21:24pm

majid torfi

Comments

Karim Pazoki 1-Sep-14 4:22am

thanks majid.
But I don`t wanna to download file and edit local file! I wanna edit file that is at "http://domain".

majid torfi 1-Sep-14 8:38am

for server you can use this tip :
using(FileStream os = new FileStream(Server.MapPath("/output/asdasdasd.ico"), FileMode.Create))
{
var ic = MakeIcon(iconbitmap, 16, false); /// function returns an icon
ic.Save(os);
}