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c# download the extracted image

I have created a Form Application to Extracted Image , I have searched many posts , till Now I am able to download into the MemoryStream (Byte Array ).
I am not able to save that byte array into file system and check the image size ....
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
public List<string> FetchImages(string Url)
{
List<string> imageList = new List<string>();
if (!Url.StartsWith("http://") && !Url.StartsWith("https://"))
Url = "http://" + Url;
string responseUrl = string.Empty;
string htmlData = ASCIIEncoding.ASCII.GetString(DownloadData(Url, out responseUrl));
if (responseUrl != string.Empty)
Url = responseUrl;
if (htmlData != string.Empty)
{
string imageHtmlCode = "<img";
string imageSrcCode = #"src=""";
int index = htmlData.IndexOf(imageHtmlCode);
while (index != -1)
{
htmlData = htmlData.Substring(index);
int brackedEnd = htmlData.IndexOf('>'); //make sure data will be inside img tag
int start = htmlData.IndexOf(imageSrcCode) + imageSrcCode.Length;
int end = htmlData.IndexOf('"', start + 1);
if (end > start && start < brackedEnd)
{
string loc = htmlData.Substring(start, end - start);
imageList.Add(loc);
}
if (imageHtmlCode.Length < htmlData.Length)
index = htmlData.IndexOf(imageHtmlCode, imageHtmlCode.Length);
else
index = -1;
}
for (int i = 0; i < imageList.Count; i++)
{
string img = imageList[i];
string baseUrl = GetBaseURL(Url);
if ((!img.StartsWith("http://") && !img.StartsWith("https://"))
&& baseUrl != string.Empty)
img = baseUrl + "/" + img.TrimStart('/');
imageList[i] = img;
}
}
return imageList;
}
private byte[] DownloadData(string Url)
{
string empty = string.Empty;
return DownloadData(Url, out empty);
}
private byte[] DownloadData(string Url, out string responseUrl)
{
byte[] downloadedData = new byte[0];
try
{
WebRequest req = WebRequest.Create(Url);
WebResponse response = req.GetResponse();
Stream stream = response.GetResponseStream();
responseUrl = response.ResponseUri.ToString();
byte[] buffer = new byte[1024];
MemoryStream memStream = new MemoryStream();
while (true)
{
int bytesRead = stream.Read(buffer, 0, buffer.Length);
if (bytesRead == 0)
{
break;
}
else
{
memStream.Write(buffer, 0, bytesRead);
}
}
downloadedData = memStream.ToArray();
stream.Close();
memStream.Close();
}
catch (Exception)
{
responseUrl = string.Empty;
return new byte[0];
}
return downloadedData;
}
private Image ImageFromURL(string Url)
{
byte[] imageData = DownloadData(Url);
Image img = null;
try
{
MemoryStream stream = new MemoryStream(imageData);
img = Image.FromStream(stream);
stream.Close();
}
catch (Exception)
{
}
return img;
}
private string GetBaseURL(string Url)
{
int inx = Url.IndexOf("://") + "://".Length;
int end = Url.IndexOf('/', inx);
string baseUrl = string.Empty;
if (end != -1)
return Url.Substring(0, end);
else
return string.Empty;
}
private void btnGetImages_Click(object sender, EventArgs e)
{
this.Cursor = Cursors.WaitCursor;
listImages.Items.Clear();
foreach (string image in FetchImages(txtURL.Text))
{
listImages.Items.Add(image);
}
this.Cursor = Cursors.Default;
}
private void btnView_Click(object sender, EventArgs e)
{
if (listImages.SelectedIndex != -1)
picImage.Image = ImageFromURL(listImages.SelectedItem.ToString());
}
private void btnSave_Click(object sender, EventArgs e)
{
}
private void btnDownload_Click(object sender, EventArgs e)
{
DownloadData(txtURL.Text);
}
.. I am trying to save the memroy stream into hard drive but still not getting exact code ,
i think this code needs some additional changes
MemoryStream memStream = new MemoryStream();
while (true)
{
//Try to read the data
int bytesRead = stream.Read(buffer, 0, buffer.Length);
if (bytesRead == 0)
{
break;
}
else
{
//Write the downloaded data
memStream.Write(buffer, 0, bytesRead);
}
}
Any Help will be appreciated

If you want to save the Byte[] array to a file,
Syntax : File.WriteAllBytes(string path, byte[] bytes)
Eg : File.WriteAllBytes("Foo.txt", arrBytes); // Requires System.IO
refer this link for more info http://msdn.microsoft.com/en-us/library/system.io.file.writeallbytes.aspx
If you want to convert the Byte back to image and save to the drive.
Eg:
byte[] bitmap = YourImage();
using(Image image = Image.FromStream(new MemoryStream(bitmap)))
{
image.Save("image.jpg", ImageFormat.Jpeg);
}

How can i download a file faster?

I have made a download program in C#. It is a queue downloader.
You can see how it works here: Click Express Downloader
Is there any faster method to download?
Here is the method i use, it must support resume support.
private void Download(object startPoint)
{
try
{
try
{
//int startPointInt = Convert.ToInt32(startPoint);
Int64 startPointInt = Convert.ToInt64(startPoint);
webRequest = (HttpWebRequest)WebRequest.Create(url);
webRequest.AddRange(startPointInt);
webRequest.Credentials = CredentialCache.DefaultCredentials;
webResponse = (HttpWebResponse)webRequest.GetResponse();
Int64 fileSize = webResponse.ContentLength;
strResponse = webResponse.GetResponseStream();
if (startPointInt == 0)
{
strLocal = new FileStream(txtPath.Text + "\\" + filename, FileMode.Create, FileAccess.Write, FileShare.None);
}
else
{
strLocal = new FileStream(txtPath.Text + "\\" + filename, FileMode.Append, FileAccess.Write, FileShare.None);
}
int bytesSize = 0;
byte[] downBuffer = new byte[4096];
while ((bytesSize = strResponse.Read(downBuffer, 0, downBuffer.Length)) > 0)
{
strLocal.Write(downBuffer, 0, bytesSize);
this.Invoke(new UpdateProgessCallback(this.UpdateProgress), new object[] { strLocal.Length, fileSize + startPointInt });
if (goPause == true)
{
break;
}
}
}
catch { }
}
finally
{
strResponse.Close();
strLocal.Close();
}
}

You have to do two things,
Get faster bandwidth
Change block size from 4096 to something like 8192 or any number which can be hold in memory easily.

How can I upload more than one file to my FTP site?

The idea is that if I selected more than one file then upload one file when, then when it finishes to upload then upload the next one and so on.
I changed the filedialoug to be able to select multi:
private void btnBrowse_Click(object sender, EventArgs e)
{
openFileDialog1.Multiselect = true;
if (this.openFileDialog1.ShowDialog() != DialogResult.Cancel)
this.txtUploadFile.Text = this.openFileDialog1.FileName;
}
I can select more than one file the problem is that when using a breakpoint I see on this.txtUploadFile.Text one file only the first I selected. txtUploadFile is a textBox.
The first thing is: how can I see on the textBox(txtUploadFile) all the selected files and not only one? Or how can I get some indication that all the files I selected really selected? Maybe to show somehow in the textBox something that all files selected?
The important part is: how do I upload all the selected files one by one?
This is the button click event that starting the files uploading:
private void btnUpload_Click(object sender, EventArgs e)
{
if(this.ftpProgress1.IsBusy)
{
this.ftpProgress1.CancelAsync();
this.btnUpload.Text = "Upload";
}
else
{
FtpSettings f = new FtpSettings();
f.Host = this.txtHost.Text;
f.Username = this.txtUsername.Text;
f.Password = this.txtPassword.Text;
f.TargetFolder = this.txtDir.Text;
f.SourceFile = this.txtUploadFile.Text;
f.Passive = this.chkPassive.Checked;
try
{
f.Port = Int32.Parse(this.txtPort.Text);
}
catch { }
this.toolStripProgressBar1.Visible = true;
this.ftpProgress1.RunWorkerAsync(f);
this.btnUpload.Text = "Cancel";
}
}
I also have a backgroundworker with a progressBar so each file that is uploading the progressBar should show the progress of the uploading today it's showing for one file since I can upload only one file:
private void ftpProgress1_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
this.toolStripStatusLabel1.Text = e.UserState.ToString(); // The message will be something like: 45 Kb / 102.12 Mb
this.toolStripProgressBar1.Value = Math.Min(this.toolStripProgressBar1.Maximum, e.ProgressPercentage);
}
private void ftpProgress1_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
if(e.Error != null)
MessageBox.Show(e.Error.ToString(), "FTP error");
else if(e.Cancelled)
this.toolStripStatusLabel1.Text = "Upload Cancelled";
else
this.toolStripStatusLabel1.Text = "Upload Complete";
this.btnUpload.Text = "Upload";
this.toolStripProgressBar1.Visible = true;
}
And last the class of the FTP uploader:
using System;
using System.ComponentModel;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Net;
using System.Text;
namespace FTP_ProgressBar
{
public partial class FtpProgress : BackgroundWorker
{
public static string ConnectionError;
private FtpSettings f;
public FtpProgress()
{
InitializeComponent();
}
public FtpProgress(IContainer container)
{
container.Add(this);
InitializeComponent();
}
private void FtpProgress_DoWork(object sender, DoWorkEventArgs e)
{
try
{
BackgroundWorker bw = sender as BackgroundWorker;
f = e.Argument as FtpSettings;
string UploadPath = String.Format("{0}/{1}{2}", f.Host, f.TargetFolder == "" ? "" : f.TargetFolder + "/", Path.GetFileName(f.SourceFile));
if (!UploadPath.ToLower().StartsWith("ftp://"))
UploadPath = "ftp://" + UploadPath;
FtpWebRequest request = (FtpWebRequest)WebRequest.Create(UploadPath);
request.UseBinary = true;
request.UsePassive = f.Passive;
request.Method = WebRequestMethods.Ftp.UploadFile;
request.Timeout = 300000;
request.Credentials = new NetworkCredential(f.Username, f.Password);
long FileSize = new FileInfo(f.SourceFile).Length;
string FileSizeDescription = GetFileSize(FileSize);
int ChunkSize = 4096, NumRetries = 0, MaxRetries = 50;
long SentBytes = 0;
byte[] Buffer = new byte[ChunkSize];
using (Stream requestStream = request.GetRequestStream())
{
using (FileStream fs = File.Open(f.SourceFile, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
{
int BytesRead = fs.Read(Buffer, 0, ChunkSize);
while (BytesRead > 0)
{
try
{
if (bw.CancellationPending)
return;
requestStream.Write(Buffer, 0, BytesRead);
SentBytes += BytesRead;
string SummaryText = String.Format("Transferred {0} / {1}", GetFileSize(SentBytes), FileSizeDescription);
bw.ReportProgress((int)(((decimal)SentBytes / (decimal)FileSize) * 100), SummaryText);
}
catch (Exception ex)
{
Debug.WriteLine("Exception: " + ex.ToString());
if (NumRetries++ < MaxRetries)
{
fs.Position -= BytesRead;
}
else
{
throw new Exception(String.Format("Error occurred during upload, too many retries. \n{0}", ex.ToString()));
}
}
BytesRead = fs.Read(Buffer, 0, ChunkSize);
}
}
}
using (FtpWebResponse response = (FtpWebResponse)request.GetResponse())
System.Diagnostics.Debug.WriteLine(String.Format("Upload File Complete, status {0}", response.StatusDescription));
}
catch (WebException ex)
{
switch (ex.Status)
{
case WebExceptionStatus.NameResolutionFailure:
ConnectionError = "Error: Please check the ftp address";
break;
case WebExceptionStatus.Timeout:
ConnectionError = "Error: Timout Request";
break;
}
}
}
public static string GetFileSize(long numBytes)
{
string fileSize = "";
if(numBytes > 1073741824)
fileSize = String.Format("{0:0.00} Gb", (double)numBytes / 1073741824);
else if(numBytes > 1048576)
fileSize = String.Format("{0:0.00} Mb", (double)numBytes / 1048576);
else
fileSize = String.Format("{0:0} Kb", (double)numBytes / 1024);
if(fileSize == "0 Kb")
fileSize = "1 Kb";
return fileSize;
}
}
public class FtpSettings
{
public string Host, Username, Password, TargetFolder, SourceFile;
public bool Passive;
public int Port = 21;
}
}
It is a bit long, but I couldn't find a way to narrow the code since it's all connected to each other.
What I need it to do is if I selected more than one file make something like a queue and automatic upload one file when finished upload the next file and so on until the last file.
Today I can upload only one file. Single file each time.
I need that it will automatically upload all the selected files. Using the progressBar and the backgroundworker like it is now.

Here is a procedure how to upload multiple files from the directory where ftp - an address of ftp server:
private void uploadFTP(DirectoryInfo d, string ftp)
{
FileInfo[] flist = d.GetFiles();
if (flist.GetLength(0) > 0)
{
foreach (FileInfo txf in flist)
{
FtpWebRequest request = (FtpWebRequest)FtpWebRequest.Create(ftp + txf.Name);
request.Method = WebRequestMethods.Ftp.UploadFile;
request.Credentials = new NetworkCredential("username", "password");
request.UsePassive = true;
request.UseBinary = true;
request.KeepAlive = false;
FileStream stream = File.OpenRead(txf.FullName);
byte[] buffer = new byte[stream.Length];
stream.Read(buffer, 0, buffer.Length);
stream.Close();
Stream reqStream = request.GetRequestStream();
reqStream.Write(buffer, 0, buffer.Length);
reqStream.Close();
txf.Delete();
}
}
}

You should be using
OpenFileDialog1.FileNames
And iterate on those elements to upload them one by one.
FileNames Property

Silverlight File Upload with Original Creation, Modification & Access Dates

I'm using those methods to upload files,
Client Side:
private void Add(object sender, MouseButtonEventArgs e)
{
OpenFileDialog OFD = new OpenFileDialog();
OFD.Multiselect = true;
OFD.Filter = "Python (*.py)|*.py";
bool? Result = OFD.ShowDialog();
if (Result != null && Result == true)
foreach (var File in OFD.Files)
mylistbox.Items.Add(File);
}
private void Submit(object sender, MouseButtonEventArgs e)
{
foreach (var File in mylistbox.Items)
Process(((FileInfo)File).Name.Replace(((FileInfo)File).Extension, string.Empty), ((FileInfo)File).OpenRead());
}
private void Process(string File, Stream Data)
{
UriBuilder Endpoint = new UriBuilder("http://localhost:5180/Endpoint.ashx");
Endpoint.Query = string.Format("File={0}", File);
WebClient Client = new WebClient();
Client.OpenWriteCompleted += (sender, e) =>
{
Send(Data, e.Result);
e.Result.Close();
Data.Close();
};
Client.OpenWriteAsync(Endpoint.Uri);
}
private void Send(Stream Input, Stream Output)
{
byte[] Buffer = new byte[4096];
int Flag;
while ((Flag = Input.Read(Buffer, 0, Buffer.Length)) != 0)
{
Output.Write(Buffer, 0, Flag);
}
}
Server Side:
public void ProcessRequest(HttpContext Context)
{
using (FileStream Stream = File.Create(Context.Server.MapPath("~/" + Context.Request.QueryString["File"].ToString() + ".py")))
{
Save(Context.Request.InputStream, Stream);
}
}
private void Save(Stream Input, FileStream Output)
{
byte[] Buffer = new byte[4096];
int Flag;
while ((Flag = Input.Read(Buffer, 0, Buffer.Length)) != 0)
{
Output.Write(Buffer, 0, Flag);
}
}
My problem is that uploaded files have different Creation, Modification & Access Dates.
Why ?

When you upload a file, you are essentially creating a new file, with duplicated contents.
From your code:
using (FileStream Stream = File.Create(Context.Server.MapPath("~/" + Context.Request.QueryString["File"].ToString() + ".py")))
{
Save(Context.Request.InputStream, Stream);
}
The File.Create is responsible for the new dates.
See this answer for information on preserving the dates.

to post image file in windows phone 7 application

I am developing an application for windows phone 7.From here I want to upload an image file to the remote server.I am using the following code to receive the file at my receiving end:
if (Request.Files.Count > 0)
{
string UserName = Request.QueryString["SomeString"].ToString();
HttpFileCollection MyFilecollection = Request.Files;
string ImageName = System.Guid.NewGuid().ToString() + MyFilecollection[0].FileName;
MyFilecollection[0].SaveAs(Server.MapPath("~/Images/" + ImageName));
}
Now my problem is, how can I post the file from my windows phone 7 platform (using PhotoChooserTask).I have tried the following code but with no success.(the following code is called from the PhotoChooserTask completed event handler.
private void UploadFile(string fileName, Stream data)
{
char[] ch=new char[1];
ch[0] = '\\';
string [] flname=fileName.Split(ch);
UriBuilder ub = new UriBuilder("http://www.Mywebsite.com?SomeString="+ussi );
ub.Query = string.Format("name={0}", flname[6]);
WebClient c = new WebClient();
c.OpenWriteCompleted += (sender, e) =>
{
PushData(data, e.Result);
e.Result.Close();
data.Close();
};
c.OpenWriteAsync(ub.Uri);
}
private void PushData(Stream input, Stream output)
{
byte[] buffer = new byte[4096];
int bytesRead;
while ((bytesRead = input.Read(buffer, 0, buffer.Length)) != 0)
{
output.Write(buffer, 0, bytesRead);
}
}
Please help me out to get out from this problem.
Thanks

I was able to get this working, but not using the Files collection. From my post at http://chriskoenig.net/2011/08/19/upload-files-from-windows-phone/:
Client Code
public partial class MainPage : PhoneApplicationPage
{
// Constructor
public MainPage()
{
InitializeComponent();
}
private void SelectButton_Click(object sender, RoutedEventArgs e)
{
PhotoChooserTask task = new PhotoChooserTask();
task.Completed += task_Completed;
task.Show();
}
private void task_Completed(object sender, PhotoResult e)
{
if (e.TaskResult != TaskResult.OK)
return;
const int BLOCK_SIZE = 4096;
Uri uri = new Uri("http://localhost:4223/File/Upload", UriKind.Absolute);
WebClient wc = new WebClient();
wc.AllowReadStreamBuffering = true;
wc.AllowWriteStreamBuffering = true;
// what to do when write stream is open
wc.OpenWriteCompleted += (s, args) =>
{
using (BinaryReader br = new BinaryReader(e.ChosenPhoto))
{
using (BinaryWriter bw = new BinaryWriter(args.Result))
{
long bCount = 0;
long fileSize = e.ChosenPhoto.Length;
byte[] bytes = new byte[BLOCK_SIZE];
do
{
bytes = br.ReadBytes(BLOCK_SIZE);
bCount += bytes.Length;
bw.Write(bytes);
} while (bCount < fileSize);
}
}
};
// what to do when writing is complete
wc.WriteStreamClosed += (s, args) =>
{
MessageBox.Show("Send Complete");
};
// Write to the WebClient
wc.OpenWriteAsync(uri, "POST");
}
}
Server Code
public class FileController : Controller
{
[HttpPost]
public ActionResult Upload()
{
string filename = Server.MapPath("/Uploads/" + Path.GetRandomFileName();
try
{
using (FileStream fs = new FileStream(filename), FileMode.Create))
{
using (BinaryWriter bw = new BinaryWriter(fs))
{
using (BinaryReader br = new BinaryReader(Request.InputStream))
{
long bCount = 0;
long fileSize = br.BaseStream.Length;
const int BLOCK_SIZE = 4096;
byte[] bytes = new byte[BLOCK_SIZE];
do
{
bytes = br.ReadBytes(BLOCK_SIZE);
bCount += bytes.Length;
bw.Write(bytes);
} while (bCount < fileSize);
}
}
}
return Json(new { Result = "Complete" });
}
catch (Exception ex)
{
return Json(new { Result = "Error", Message = ex.Message });
}
}
}
Note that I'm using ASP.NET MVC to receive my file, but you should be able to use the same, core logic with WebForms.
/chris