Develop Reference

Testing FTP Output of a Stream

Brand new to StackOverflow.... I'm writing a console app in C#. I'd like to verify that an Excel spreadsheet is streaming correctly using FTP.
The application calls a stored procedure, populates a datatable with the result set, reads the datatable into a stream and then FTP's that stream onto a 3rd party site. I'd like to upload the stream somewhere besides that actual 3rd party site just to verify everything shows properly on the other end. Looking for help with how to do that.
I've tried setting up a local FTP but received the following error when trying to create the FTPWebRequest:
"The requested URI is invalid for this FTP command."
FtpWebRequest myWebRequest = (FtpWebRequest)WebRequest.Create("ftp address");
I also tried Console.Out with no luck.
This is what my code to upload looks like:
StreamReader sourceStream;
using (sourceStream = new StreamReader(path))
{
fileContents = Encoding.UTF8.GetBytes(sourceStream.ReadToEnd());
}
myWebRequest.ContentLength = fileContents.Length;
using (Stream requestStream = myWebRequest.GetRequestStream())
{
requestStream.Write(fileContents, 0, fileContents.Length);
}
using (FtpWebResponse response = (FtpWebResponse)myWebRequest.GetResponse())
{
Console.WriteLine($"Upload File Complete, status {response.StatusDescription}");
}

c# how to list all files from ftp directory and read each file without downloading [duplicate]

I would like to load an excel file directly from an ftp site into a memory stream. Then I want to open the file in the FarPoint Spread control using the OpenExcel(Stream) method. My issue is I'm not sure if it's possible to download a file directly into memory. Anyone know if this is possible?

Yes, you can download a file from FTP to memory.
I think you can even pass the Stream from the FTP server to be processed by FarPoint.
WebRequest request = FtpWebRequest.Create("ftp://asd.com/file");
using (WebResponse response = request.GetResponse())
{
Stream responseStream = response.GetResponseStream();
OpenExcel(responseStream);
}
Using WebClient you can do nearly the same. Generally using WebClient is easier but gives you less configuration options and control (eg.: No timeout setting).
WebClient wc = new WebClient();
using (MemoryStream stream = new MemoryStream(wc.DownloadData("ftp://asd.com/file")))
{
OpenExcel(stream);
}

Take a look at WebClient.DownloadData. You should be able to download the file directory to memory and not write it to a file first.
This is untested, but something like:
var spreadSheetStream
= new MemoryStream(new WebClient().DownloadData(yourFilePath));
I'm not familiar with FarPoint though, to say whether or not the stream can be used directly with the OpenExcel method. Online examples show the method being used with a FileStream, but I'd assume any kind of Stream would be accepted.

Download file from URL to memory.
My answer does not exactly show, how to download a file for use in Excel, but shows how to create a generic-purpose in-memory byte array.
private static byte[] DownloadFile(string url)
{
byte[] result = null;
using (WebClient webClient = new WebClient())
{
result = webClient.DownloadData(url);
}
return result;
}

How to read javascript file using HttpWebRequest in c#

I have a javascript file in a remote server, and when I use httpwebrequest it returns some weird characters.
Thr url is http://goo.gl/0Ug5QI
Is this kind of compressed contents?
static string GetScriptSource(string _url)
{
string _retValue = string.Empty;
HttpWebRequest hwr = (HttpWebRequest)WebRequest.Create(_url);
hwr.Method = "GET";
HttpWebResponse res = (HttpWebResponse)hwr.GetResponse();
StreamReader sr = new StreamReader(res.GetResponseStream());
return sr.ReadToEnd();
}
My code to read that script file's content is very simple.

Looking at the js source that you linked to, it could be that is has been gzipped. Try saving the source as a file and use 7zip or something to see if you can unzip it. There is a GZip library in C# so if it has been gzipped then you should be able to unzip it easily enough.
Although it's a Korean web site so maybe the encoding is not correct.
Either way it's not a problem with the code that you posted.

Can a binary file read and writen by StreamReader and StreamWriter be fixed?

If I read and wrote a binary file using StreamReader and StreamWriter, can the file be repaired?
// Original Code - Corrupted the Destination File
using (Stream responseStream = response.GetResponseStream())
{
using (StreamReader reader = new StreamReader(responseStream))
{
using (StreamWriter writer = new StreamWriter(destinationFileName, false))
{
writer.Write(reader.ReadToEnd());
}
}
}
// New Code - Destination File is Good
using (Stream responseStream = response.GetResponseStream())
{
using (FileStream fs = File.Create(destinationFileName))
{
responseStream.CopyTo(fs);
}
}

If I read and wrote a binary file using StreamReader and StreamWriter, can the file be repaired?
It depends what's in the file. If it's actually text in the right encoding, then you won't have lost anything.
If it's genuinely binary data (e.g. a JPEG) then you'll almost certainly have lost information, irreparably. Just don't do it, and if you've already done it, I probably wouldn't try to "fix" the files - I'd write them off as "bad".
If you'd used ISO-8859-1, it's possible that all would have been well - although it would still have been bad code which would be better off changed.

Try to read it with a StreamReader and see if the string you get back makes sense. This is your best option to recover the data. Once you have a "correct" string you need to try different Encodings to write to a binary file. Try UTF8, UTF16 and Encoding.Default.
I guess it will take a bit of playing around to recover some of the data. Please note that it is likely that you have lost some of it permanently.

Pass through XML from another website

I am trying to pass through some XML from an external website.
What is the best way of doing this, through c# webpage or asp.MVC?

I tend to use something like this for working with external XML documents / RSS feeds etc:
string sURL = ".....";
// Create a request for the URL.
WebRequest oRequest = WebRequest.Create(sUrl);
// Get the response.
WebResponse oResponse = oRequest.GetResponse();
// Get the stream containing content returned by the server.
Stream oDataStream = oResponse.GetResponseStream();
// Open the stream using a StreamReader for easy access.
StreamReader oReader = new StreamReader(oDataStream, System.Text.Encoding.Default);
// Read the content.
string sXML = oReader.ReadToEnd();
// Convert string to XML
XDocument oFeed = XDocument.Parse(sXML);

Either should be fine. MVC is probably easiest (in terms of getting a raw response), but you could do the same in regular ASP.NET just by using a handler (possibly .ashx), or just by clearing the response.