I want to create a file with a .aspx extension(or any other extension) completely in memory. Can this be done?
Right now I have a memory stream that has all the stuff I want to write to this file but I don't actually want to create a physical file on the server since then I probably have to enable write permissions for my server. What I want to do is create the file in memory and upload via ftpWebRequest.
Edit.
I must be doing something wrong because I get weird stuff in my file so weird I can't even paste it into my posts.
Basically it is a bunch of squares between everything. Like it almost seems like it fills it in for the spaces. Like If I look closely I will see the tag still but it will have a square between each letter.
Here is a portion of my code. Maybe I am using the wrong encoding?
using (MemoryStream memory = new MemoryStream())
{
UnicodeEncoding uniEncoding = new UnicodeEncoding();
// readByline is the first bunch of data I want for my new file.
memory.Write(uniEncoding.GetBytes(readByLine), 0, readByLine.Length);
// second bunch of data I want for my new file.
memory.Write(uniEncoding.GetBytes(html), 0, html.Length);
// the follow code just figure out the end of the file that I am
// trying to extract some information out of.
string readToEnd = reader.ReadToEnd();
int endIndex = readToEnd.IndexOf(END_FLAG);
endIndex += END_FLAG.Length;
string restOfFile = readToEnd.Substring(endIndex);
// once found I write it the memory stream.
memory.Write(uniEncoding.GetBytes(restOfFile),0,restOfFile.Length);
// now I want to upload my file. I have the same file name already
// existing on the server? Do I have to tell it override it?
FtpWebRequest request2 = (FtpWebRequest)WebRequest.Create(path);
request2.Method = WebRequestMethods.Ftp.UploadFile;
request2.Credentials = new NetworkCredential(ftpUsername, ftpPassword);
// now I am trying your code.
byte[] fileContents = memory.ToArray();
using (Stream writer = request2.GetRequestStream())
{
writer.Write(fileContents, 0, fileContents.Length);
}
FtpWebResponse test = (FtpWebResponse)request2.GetResponse();
return Content("test");
}
You can convert the MemoryStream to a byte[] and then use WebClient.UploadData to upload the file with FTP to some server without writing it on the client to disk first:
webClient.UploadData(
"ftp://remoteserver/remotepath/file.aspx"
memoryStream.ToArray());
FtpWebRequest works as well, of course, but needs a few more lines of code:
FtpWebRequest ftpRequest;
FtpWebResponse ftpResponse;
ftpRequest = (FtpWebRequest)FtpWebRequest.Create(new Uri("ftp://..."));
ftpRequest.Method = WebRequestMethods.Ftp.UploadFile;
ftpRequest.Proxy = null;
ftpRequest.UseBinary = true;
ftpRequest.Credentials = new NetworkCredential("UserName", "Password");
using (Stream stream = ftpRequest.GetRequestStream())
using (StreamWriter writer = new StreamWriter(stream, Encoding.UTF8))
{
writer.WriteLine("<html><head><title>Hello World</title></head>...");
}
ftpResponse = (FtpWebResponse)ftpRequest.GetResponse();
Well, such a file is really just plain text, with certain formatting - HTML 4.0, XHTML or such.
So yes, you can create that in memory - inside e.g. a StringBuilder, and then save it back out to disk using a StreamWriter or some other means.
If you can't or don't want to write it out to disk, you can of course also put it into a MemoryStream, and interfaces that can read from any arbitrary stream can read from the memory stream, too.
Check out the MSDN docs on FtpWebRequest and on GetRequestStream() method. It has a sample on how to upload from a stream to FTP directly:
// Get the object used to communicate with the server.
FtpWebRequest request = (FtpWebRequest)WebRequest.Create(serverUri);
request.Method = WebRequestMethods.Ftp.UploadFile;
// this could be your MemoryStream, of course, that you're reading from
StreamReader sourceStream = new StreamReader(fileName);
byte[] fileContents = Encoding.UTF8.GetBytes(sourceStream.ReadToEnd());
sourceStream.Close();
request.ContentLength = fileContents.Length;
request.Credentials = new NetworkCredential(ftpUsername, ftpPassword);
Stream requestStream = request.GetRequestStream();
requestStream.Write(fileContents, 0, fileContents.Length);
requestStream.Close();
FtpWebResponse response = (FtpWebResponse)request.GetResponse();
// check the response, do whatever you need to do with it
response.Close();
Related
I have a very simple piece of code.
Everything is correctly written, no typos, and i chattet with a coworker but both of us have simply no idead where the error lies in here.
It smoothly goes through undtil the GetRequestStream() where the exception pops up. It finds the files, encodes it correctly but then can't seem to connect with the server.
This is the code:
public class WebRequestUploadExample
{
public void WebRequestUpload()
{
// Get the object used to communicate with the server.
FtpWebRequest request = (FtpWebRequest)WebRequest.Create(#"ftp://xxxxx");
request.Method = WebRequestMethods.Ftp.UploadFile;
// This example assumes the FTP site uses anonymous logon.
request.Credentials = new NetworkCredential("xxxxx", "xxxxx");
// Copy the contents of the file to the request stream.
StreamReader sourceStream = new StreamReader(#"D:\ftpTest\Test\Test.txt");
byte[] fileContents = Encoding.UTF8.GetBytes(sourceStream.ReadToEnd());
sourceStream.Close();
request.ContentLength = fileContents.Length;
Stream requestStream = request.GetRequestStream();
requestStream.Write(fileContents, 0, fileContents.Length);
requestStream.Close();
FtpWebResponse response = (FtpWebResponse)request.GetResponse();
Console.WriteLine("Upload File Complete, status {0}", response.StatusDescription);
response.Close();
}
}
May be your target server does not support 'passive' mode. Have you tried active-mode? request.UsePassive = false;
FtpWebRequest.UsePassive
I can't use WebClient, before anyone suggests that because it makes my legit application seem like a virus to McAfee. So please don't suggest that.
I have a binary.txt file stored on my server. It is approximately 1,240kb. However, HttpWebRequest downloads random amounts from 1,300kb to 1,700kb.
HttpWebRequest httpRequest = (HttpWebRequest)
WebRequest.Create("http://deviantsmc.com/binary.txt");
httpRequest.Method = WebRequestMethods.Http.Get;
HttpWebResponse httpResponse = (HttpWebResponse)httpRequest.GetResponse();
Stream httpResponseStream = httpResponse.GetResponseStream();
byte[] buffer = new byte[1240];
int bytesRead = 0;
StringBuilder sb = new StringBuilder();
//FileStream fileStream = File.Create(#"tcontent.txt");
while ((bytesRead = httpResponseStream.Read(buffer, 0, 1240)) != 0)
{
sb.Append(Encoding.ASCII.GetString(buffer));
//fileStream.Write(buffer, 0, bytesRead);
}
File.WriteAllText(#"tcontent1.txt", sb.ToString());
(The contents of the binary.txt file on the server are in ASCII, therefore I get the Encoding string to ASCII as well).
This is how I encoded that text file (on that server)
My file is basically this:
byte[] bytes = File.ReadAllBytes("binary.txt");
String encBytes = Encoding.ASCII.GetString(bytes);
File.WriteAllText(file("binary.txt"), encBytes);
I contacted the AV company about the WebDownloader being seen as some malicious import in C#, but they didn't get back to me, so I'm forced to use HttpWebRequest.
If your only goal is to fetch that binary and write it to disk you can simply copy the stream to a file with the CopyTo method that exists on a Stream object.
Your file looks like a broken zip file btw, given the first characters that are PK, and is used in the zip specificaton.
From wikipedia:
Viewed as an ASCII string this reads "PK", the initials of the inventor Phil Katz. Thus, when a .ZIP file is viewed in a text editor the first two bytes of the file are usually "PK".
I used 7-zip to open your file as the Windows default didn't accept it as a valid file. It contains a manifest.mf file but the content itself seems missing. the file itself has a size of 1.269.519 bytes.
HttpWebRequest httpRequest = (HttpWebRequest)
WebRequest.Create("http://deviantsmc.com/binary.txt");
httpRequest.Method = WebRequestMethods.Http.Get;
HttpWebResponse httpResponse = (HttpWebResponse)httpRequest.GetResponse();
Stream httpResponseStream = httpResponse.GetResponseStream();
// create and open a FileStream, using calls dispose when done
using(var fs= File.Create(#"c:\temp\bin.7z"))
{
// Copy all bytes from the responsestream to the filestream
httpResponseStream.CopyTo(fs);
}
I think you should write the entire binary data to the local file, instead of encoding it segmentally, you can try this:
HttpWebRequest httpRequest = (HttpWebRequest)
WebRequest.Create("http://deviantsmc.com/binary.txt");
httpRequest.Method = WebRequestMethods.Http.Get;
HttpWebResponse httpResponse = (HttpWebResponse)httpRequest.GetResponse();
Stream httpResponseStream = httpResponse.GetResponseStream();
using (BinaryReader responseReader = new BinaryReader(httpResponseStream.GetResponseStream()))
{
byte[] bytes = responseReader.ReadBytes((int)response.ContentLength);
using (BinaryWriter sw = new BinaryWriter(File.OpenWrite("tcontent1.txt")))
{
sw.Write(bytes);
sw.Flush();
sw.Close();
}
}
Hope this can help
I'm calling a routine in PHP (TCPDF) from C# via WebRequest using StreamReader. The PDF file is returned as a stream and stored in a string (obv). I know the data being returned to the string is actually a PDF file, as I've tested it in PHP. I'm having a hard time writing the string to a file and actually getting a valid PDF in C#. I know it has something to do with the way I'm trying to encode the file, but the several things I've tried have resulted in 'Not today, Padre' (i.e. they didn't work)
Here's the class I'm using to perform the request (thanks to user 'Paramiliar' for the example I'm using/borrowed/stole):
public class httpPostData
{
WebRequest request;
WebResponse response;
public string senddata(string url, string postdata)
{
// create the request to the url passed in the paramaters
request = (WebRequest)WebRequest.Create(url);
// set the method to POST
request.Method = "POST";
// set the content type and the content length
request.ContentType = "application/x-www-form-urlencoded";
request.ContentLength = postdata.Length;
// convert the post data into a byte array
byte[] byteData = Encoding.UTF8.GetBytes(postdata);
// get the request stream and write the data to it
Stream dataStream = request.GetRequestStream();
dataStream.Write(byteData, 0, byteData.Length);
dataStream.Close();
// get the response
response = request.GetResponse();
dataStream = response.GetResponseStream();
StreamReader reader = new StreamReader(dataStream);
// read the response
string serverresponse = reader.ReadToEnd();
//Console.WriteLine(serverresponse);
reader.Close();
dataStream.Close();
response.Close();
return serverresponse;
}
} // end class httpPostData
...and my call to it
httpPostData myPost = new httpPostData();
// postData defined (not shown)
string response = myPost.senddata("http://www.example.com/pdf.php", postData);
In case it isn't clear, I'm stuck writing string response to a valid .pdf file. I've tried this (Thanks to user Adrian):
static public void SaveStreamToFile(string fileFullPath, Stream stream)
{
if (stream.Length == 0) return;
// Create a FileStream object to write a stream to a file
using (FileStream fileStream = System.IO.File.Create(fileFullPath, (int)stream.Length))
{
// Fill the bytes[] array with the stream data
byte[] bytesInStream = new byte[stream.Length];
stream.Read(bytesInStream, 0, (int)bytesInStream.Length);
// Use FileStream object to write to the specified file
fileStream.Write(bytesInStream, 0, bytesInStream.Length);
}
}
..and the call to it:
string location = "C:\\myLocation\\";
SaveStreamToFile(location, response); // <<-- this throws an error b/c 'response' is a string, not a stream. New to C# and having some basic issues with things like this
I think I'm close...a nudge in the right direction would be greatly appreciated.
You can use WebClient. Use the method DownloadFile, or the async ones.
Have fun!
Fernando.-
Sorry, I haven't read your comments till now.
I guess you have already done this...
But this may help you (just replace urls and paths) (from: http://msdn.microsoft.com/en-us/library/ez801hhe.aspx )
string remoteUri = "http://www.contoso.com/library/homepage/images/";
string fileName = "ms-banner.gif", myStringWebResource = null;
// Create a new WebClient instance.
WebClient myWebClient = new WebClient();
// Concatenate the domain with the Web resource filename.
myStringWebResource = remoteUri + fileName;
Console.WriteLine("Downloading File \"{0}\" from \"{1}\" .......\n\n", fileName, myStringWebResource);
// Download the Web resource and save it into the current filesystem folder.
myWebClient.DownloadFile(myStringWebResource,fileName);
Console.WriteLine("Successfully Downloaded File \"{0}\" from \"{1}\"", fileName, myStringWebResource);
Console.WriteLine("\nDownloaded file saved in the following file system folder:\n\t" + Application.StartupPath);
Now I know how to copy files from one directory to another, this is really simple.
But now I need to do the same with files from FTP server. Can you give me some example how to get file from FTP while changing its name?
Take a look at How to: Download Files with FTP or downloading all files in directory ftp and c#
// Get the object used to communicate with the server.
FtpWebRequest request = (FtpWebRequest)WebRequest.Create("ftp://www.contoso.com/test.htm");
request.Method = WebRequestMethods.Ftp.DownloadFile;
// This example assumes the FTP site uses anonymous logon.
request.Credentials = new NetworkCredential ("anonymous","janeDoe#contoso.com");
FtpWebResponse response = (FtpWebResponse)request.GetResponse();
Stream responseStream = response.GetResponseStream();
StreamReader reader = new StreamReader(responseStream);
Console.WriteLine(reader.ReadToEnd());
Console.WriteLine("Download Complete, status {0}", response.StatusDescription);
reader.Close();
reader.Dispose();
response.Close();
Edit
If you want to rename file on FTP Server take a look at this Stackoverflow question
Easiest way
The most trivial way to download a binary file from an FTP server using .NET framework is using WebClient.DownloadFile.
It takes an URL to the source remote file and a path to the target local file. So you can use a different name for the local file, if you need that.
WebClient client = new WebClient();
client.Credentials = new NetworkCredential("username", "password");
client.DownloadFile(
"ftp://ftp.example.com/remote/path/file.zip", #"C:\local\path\file.zip");
Advanced options
If you need greater control, that WebClient does not offer (like TLS/SSL encryption, ASCII mode, active mode, etc), use FtpWebRequest. Easy way is to just copy an FTP response stream to FileStream using Stream.CopyTo:
FtpWebRequest request =
(FtpWebRequest)WebRequest.Create("ftp://ftp.example.com/remote/path/file.zip");
request.Credentials = new NetworkCredential("username", "password");
request.Method = WebRequestMethods.Ftp.DownloadFile;
using (Stream ftpStream = request.GetResponse().GetResponseStream())
using (Stream fileStream = File.Create(#"C:\local\path\file.zip"))
{
ftpStream.CopyTo(fileStream);
}
Progress monitoring
If you need to monitor a download progress, you have to copy the contents by chunks yourself:
FtpWebRequest request =
(FtpWebRequest)WebRequest.Create("ftp://ftp.example.com/remote/path/file.zip");
request.Credentials = new NetworkCredential("username", "password");
request.Method = WebRequestMethods.Ftp.DownloadFile;
using (Stream ftpStream = request.GetResponse().GetResponseStream())
using (Stream fileStream = File.Create(#"C:\local\path\file.zip"))
{
byte[] buffer = new byte[10240];
int read;
while ((read = ftpStream.Read(buffer, 0, buffer.Length)) > 0)
{
fileStream.Write(buffer, 0, read);
Console.WriteLine("Downloaded {0} bytes", fileStream.Position);
}
}
For GUI progress (WinForms ProgressBar), see:
FtpWebRequest FTP download with ProgressBar
Downloading folder
If you want to download all files from a remote folder, see
C# Download all files and subdirectories through FTP.
I have very strange problem when I upload files to my FTP (zip or gif) files.
I am creating a zip file with code and upload it with code to FTP. I can open any of this files type when I create them on my local disk. But when I upload any of this to FTP and than download it show me a message for .zip file as "unexpected end of archive" , and for .gif file type after I download them and try to open in XP Windows picture and fax viewer "Drawing failed" :
I use this code for uploading to FTP:
FtpWebRequest request = (FtpWebRequest)WebRequest.Create("ftp://ftp.tim.com/" + fileName);
request.Method = WebRequestMethods.Ftp.UploadFile;
// This example assumes the FTP site uses anonymous logon.
request.Credentials = new NetworkCredential(ftpuser,ftppass);
// Copy the contents of the file to the request stream.
StreamReader sourceStream = new StreamReader(filePath +"\\"+ fileName);
byte[] fileContents = Encoding.UTF8.GetBytes(sourceStream.ReadToEnd());
sourceStream.Close();
request.ContentLength = fileContents.Length;
request.KeepAlive = false;
Stream requestStream = request.GetRequestStream();
requestStream.Write(fileContents, 0, fileContents.Length);
requestStream.Close();
FtpWebResponse response = (FtpWebResponse)request.GetResponse();
response.Close();
This code:
StreamReader sourceStream = new StreamReader(filePath +"\\"+ fileName);
byte[] fileContents = Encoding.UTF8.GetBytes(sourceStream.ReadToEnd());
You're reading the bytestream as text with a specific encoding (UTF8)... but GIF and ZIP are binary files, not text files. The encoding is mangling them.
Try using something like ReadAllBytes:
byte[] fileContents = File.ReadAllBytes("filepath");
You are reading binary data to string (assuming it utf8) and converts it back to bytes array. That's completely wrong.