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;
}

Saving a string to a txt file on an FTP server

I am trying to save a string containing Json syntax to a .txt file on an FTP server.
I tried using this example http://msdn.microsoft.com/en-us/library/ms229715.aspx which worked great.
But this example takes an existing .txt local file and uploads it to the ftp server.
I would like to directly create / update a txt file on the ftp server from a string variable. Without having first to create the txt file locally in my pc.

Your example link is exactly what you need, but you need to get your information from a MemoryStream instead of an existing file.
You can turn a string directly into a Stream with this:
MemoryStream memStr = MemoryStream(UTF8Encoding.Default.GetBytes("asdf"));
However, you can shortcut this more by directly turning your string into a byte array, avoiding the need to make a Stream altogether:
System.Text.ASCIIEncoding encoding = new System.Text.ASCIIEncoding();
Byte[] bytes = encoding.GetBytes(yourString);
//and now plug that into your example
Stream requestStream = request.GetRequestStream();
requestStream.Write(bytes, 0, bytes.Length);
requestStream.Close();

Unzip file (odt or docx) in a memory stream

I have been developing an web application with Asp.Net and I'm using SharpZipLib to work with odt files (from Open Office) and in the future docx files (for ms office). I need to open an odt file (like a zip file) change a xml file inside it, zip again and give it to the browser send to my client.
I can do this in file system but it will get a space in my disk temporarily and we don't want it. I would like to do this in memory (with a MemoryStream class), but I don't know how to unzip folders/files in a memory stream with SharpZipLib, change and use it to zip again. Is there any sample about how to do this?
Thank you

You can use something like
Stream inputStream = //... File.OpenRead(...);
//for read file
ZipInputStream zipInputStream = new ZipInputStream(inputStream));
//for output
MemoryStream memoryStream = new MemoryStream();
using ( ZipOutputStream zipStream = new ZipOutputStream(memoryStream))
{
ZipEntry entry = new ZipEntry("...");
//...
zipStream.PutNextEntry(entry);
zipStream.Write(data, 0, data.Length);
//...
zipStream.Finish();
zipStream.Close();
}
Edit ::
You need in general unZip your file, get ZipEntry , change , and write in ZipOutputStream with MemoryStream.
Use this article http://www.codeproject.com/KB/cs/Zip_UnZip.aspx

uploading file to server

FileStream fileStream = File.OpenWrite(#"upload");
while (true)
{
thisRead = networkStream.Read(dataByte, 0, blockSize);
fileStream.Write(dataByte, 0, thisRead);
if (thisRead == 0) break;
}
this code is supposed to write the received file (the file received in bytes stream) to upload folder. the problem is that the code runs with no errors or exceptions but i dont find the file on the pc. is there another way to save the file from the user. it is sent using tcp client and network stream as a byte stream.

Firstly, you should have a using statement:
using (Stream fileStream = File.OpenWrite("upload"))
{
... // code as before
}
Secondly, if it's running without error then the code is creating a file somewhere. It'll be in the working directory of the process. You just need to work out where that is - or specify an absolute filename when creating the stream.