I have an ASP page:
<%
sData = "VARIABLE=SOMEDATAHERE"
oHttpRequest.Open "POST", "http://????/AAA/BBB", False
oHttpRequest.SetRequestHeader "Content-Type", "application/x-www-form-urlencoded"
oHttpRequest.Send sData
oPostResponse = oHttpRequest.ResponseText
Response.Write oPostResponse
%>
I am posting this to an MVC site:
[HttpPost]
public ActionResult BBB(string PORTAL)
{
}
In my BBB function I am unable to get to SOMEDATAHERE.
I have tried:
Request.Form["VARIABLE"]
Request.ServerVariables["VARIABLE"]
Ive tried reading the raw stream using the code below but thats blank too..
I am not sure what else I can try?
System.IO.Stream str; String strmContents;
Int32 counter, strLen, strRead;
// Create a Stream object.
str = Request.InputStream;
// Find number of bytes in stream.
strLen = Convert.ToInt32(str.Length);
// Create a byte array.
byte[] strArr = new byte[strLen];
// Read stream into byte array.
strRead = str.Read(strArr, 0, strLen);
// Convert byte array to a text string.
strmContents = "";
for (counter = 0; counter < strLen; counter++)
{
strmContents = strmContents + strArr[counter].ToString();
}
Related
I'm working on a ASP.NET MVC page to let users upload a Pdf document once they have digitally signed it.
But for some reason the signature is destroyed when uploading the document even when it's graphic representation is properly displayed.
Here is the code I use to upload the file:
$(document).on('click', 'input[value=Upload]', function (e, argument) {
var formdata = new FormData();
for (i = 0; i < document.getElementById('FileBox').files.length; i++) {
formdata.append(document.getElementById('FileBox').files[i].name, document.getElementById('FileBox').files[i]);
}
var url = '#Url.Action("Upload", "Test")'
var xhr = new XMLHttpRequest();
xhr.open('POST', url);
xhr.send(formdata);
xhr.onreadystatechange = function () {
if (xhr.readyState == 4 && xhr.status == 200) {
var response = $.parseJSON(xhr.response);
alert(response.result);
}
}
});
I'm retrieving the uploaded files in the controller as follows:
Public Function PostedFiles() As List(Of Byte())
Dim retval As New List(Of Byte())
Dim oRequest As HttpRequest = Web.HttpContext.Current.Request
For Each sFileKey As String In oRequest.Files
Dim oFile As HttpPostedFile = oRequest.Files(sFileKey)
If oFile.ContentLength > 0 Then
Dim iLength As Integer = oFile.ContentLength
Dim oBytes(iLength) As Byte
Dim oStream As System.IO.Stream = oFile.InputStream()
oStream.Read(oBytes, 0, iLength)
retval.Add(oBytes)
End If
Next
Return retval
End Function
After persisting the byte arrays in a SQL server database, when I take them back from the database there is no longer any signature, just the graphic representation of it.
Thanks Mkl for your comment, I realize I was getting no signature since the document was displayed in the browser. Opening the persisted file in Acrobat Reader successfully shows the signature.
I am automating the process of http post using HttpWebRequest in asp.net mvc.
Basically if the Http post is successful, it will write all the post value into a database or a file.
It works well with simple types such as strings,int, datetime. But I am not sure how to create a query string from a image,or other files such as .doc,.pdf...
When doing a file upload manually, the input value of the file will be UploadedFile:****.JPG; After choosing a local file ,for the http post I can do
string mimeType = Request.Files[upload].ContentType;
Stream fileStream = Request.Files[upload].InputStream;
string fileName = Path.GetFileName(Request.Files[upload].FileName);
int fileLength = Request.Files[upload].ContentLength;
byte[] fileData = new byte[fileLength];
fileStream.Read(fileData, 0, fileLength);
...
But I am doing the automating so I guess I need a query string something like field1=value1&field2=value2&UploadedFile=****.JPG;But I think the process won't work as the web page had no idea where the image is. So any ideas to use a phicical Url to locate the image or any file so that I can convert it to byte array and manipulate it ?
You can use base64 encoding to convert binary data to string and then put it in your query string, but its not recommended. For sending binary data its better to use post method and its data in your http request.
like this, or ^, ^, ^.
and the code:
public void PostMultipleFiles(string url, string[] files)
{
string boundary = "----------------------------" + DateTime.Now.Ticks.ToString("x");
HttpWebRequest httpWebRequest = (HttpWebRequest)WebRequest.Create(url);
httpWebRequest.ContentType = "multipart/form-data; boundary=" + boundary;
httpWebRequest.Method = "POST";
httpWebRequest.KeepAlive = true;
httpWebRequest.Credentials = System.Net.CredentialCache.DefaultCredentials;
using(Stream memStream = new System.IO.MemoryStream())
{
byte[] boundarybytes =System.Text.Encoding.ASCII.GetBytes("\r\n--" + boundary +"\r\n");
string formdataTemplate = "\r\n--" + boundary + "\r\nContent-Disposition: form-data; name=\"{0}\";\r\n\r\n{1}";
string headerTemplate = "Content-Disposition: form-data; name=\"{0}\"; filename=\"{1}\"\r\n Content-Type: application/octet-stream\r\n\r\n";
memStream.Write(boundarybytes, 0, boundarybytes.Length);
for (int i = 0; i < files.Length; i++)
{
string header = string.Format(headerTemplate, "file" + i, files[i]);
//string header = string.Format(headerTemplate, "uplTheFile", files[i]);
byte[] headerbytes = System.Text.Encoding.UTF8.GetBytes(header);
memStream.Write(headerbytes, 0, headerbytes.Length);
using(FileStream fileStream = new FileStream(files[i], FileMode.Open, FileAccess.Read))
{
byte[] buffer = new byte[1024];
int bytesRead = 0;
while ((bytesRead = fileStream.Read(buffer, 0, buffer.Length)) != 0)
{
memStream.Write(buffer, 0, bytesRead);
}
memStream.Write(boundarybytes, 0, boundarybytes.Length);
}
}
httpWebRequest.ContentLength = memStream.Length;
using(Stream requestStream = httpWebRequest.GetRequestStream())
{
memStream.Position = 0;
byte[] tempBuffer = new byte[memStream.Length];
memStream.Read(tempBuffer, 0, tempBuffer.Length);
requestStream.Write(tempBuffer, 0, tempBuffer.Length);
}
}
try
{
WebResponse webResponse = httpWebRequest.GetResponse();
Stream stream = webResponse.GetResponseStream();
StreamReader reader = new StreamReader(stream);
string var = reader.ReadToEnd();
}
catch (Exception ex)
{
// ...
}
}
I don't know a lot about torrents, at least not enough to understand how certain websites can offer both a normal download link and a torrent link to download a file uploaded by a user.
Is generating a torrent link something common and simple to achieve. Would I need a server installation?
I've made an ugly C# implementation from a Java source, and to make sure some of my encoded variables were correct, I used NBEncode from Lars Warholm.
// There are 'args' because I'm using it from command-line. (arg0 is an option not used here)
// Source file
args[1] = Directory.GetCurrentDirectory() + args[1];
// Name to give to the torrent file
args[2] = Directory.GetCurrentDirectory() + args[2];
var inFileStream = new FileStream(args[1], FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
var filename = args[2];
//BEncoding with NBEencode
var transform = new BObjectTransform();
MemoryStream s = new MemoryStream();
OSS.NBEncode.Entities.BDictionary bod = new OSS.NBEncode.Entities.BDictionary();
OSS.NBEncode.Entities.BDictionary meta = new OSS.NBEncode.Entities.BDictionary();
// Preparing the first part of the file by creating BEncoded objects
string announceURL = "https://www.mysite.com/announce";
int pieceLength = 512 * 1024;
bod.Value.Add(new BByteString("name"), new OSS.NBEncode.Entities.BByteString(filename));
bod.Value.Add(new BByteString("length"), new OSS.NBEncode.Entities.BInteger(inFileStream.Length));
bod.Value.Add(new BByteString("piece length"), new OSS.NBEncode.Entities.BInteger(pieceLength));
bod.Value.Add(new BByteString("pieces"), new BByteString(""));
meta.Value.Add(new BByteString("announce"), new BByteString(announceURL));
meta.Value.Add(new BByteString("info"), bod);
byte[] pieces = hashPieces(args[1], pieceLength);
transform.EncodeObject(meta, s);
s.Close();
// Notice that we finish with a dictionary entry of "pieces" with an empty string.
byte[] trs = s.ToArray();
s.Close();
inFileStream.Close();
// I don't know how to write array of bytes using NBEncode library, so let's continue manually
// All data has been written a MemoryStreamp, except the byte array with the hash info about each parts of the file
Stream st = new FileStream(filename + ".torrent", FileMode.Create);
BinaryWriter bw = new BinaryWriter(st);
// Let's write these Bencoded variables to the torrent file:
// The -4 is there to skip the current end of the file created by NBEncode
for (int i = 0; i < trs.Length - 4; i++)
{
bw.BaseStream.WriteByte(trs[i]);
}
// We'll add the length of the pieces SHA1 hashes:
var bt = stringToBytes(pieces.Length.ToString() + ":");
// Then we'll close the Bencoded dictionary with 'ee'
var bu = stringToBytes("ee");
// Let's append this to the end of the file.
foreach (byte b in bt)
{
bw.BaseStream.WriteByte(b);
}
foreach (byte b in pieces)
{
bw.BaseStream.WriteByte(b);
}
foreach (byte b in bu)
{
bw.BaseStream.WriteByte(b);
}
bw.Close();
st.Close();
// That's it.
}
Functions used:
private static byte[] stringToBytes(String str)
{
System.Text.UTF8Encoding encoding = new System.Text.UTF8Encoding();
Byte[] bytes = encoding.GetBytes(str);
return bytes;
}
private static byte[] hashPieces(string file, int pieceLength)
{
SHA1 sha1 = new SHA1CryptoServiceProvider();
StreamReader inn = new StreamReader(file);
MemoryStream pieces = new MemoryStream();
byte[] bytes = new byte[pieceLength];
byte[] digest = new byte[20];
int pieceByteCount = 0, readCount = inn.BaseStream.Read(bytes, 0, pieceLength);
while (readCount != 0)
{
pieceByteCount += readCount;
digest = sha1.ComputeHash(bytes, 0, readCount);
if (pieceByteCount == pieceLength)
{
pieceByteCount = 0;
foreach (byte b in digest)
{
pieces.WriteByte(b);
}
}
readCount = inn.BaseStream.Read(bytes, 0, pieceLength - pieceByteCount);
}
inn.Close();
if (pieceByteCount > 0)
foreach (byte b in digest)
{
pieces.WriteByte(b);
}
return pieces.ToArray();
}
It depends on how you're trying to create it. If you run a website, and want to generate torrent files from uploaded files, then you'll obviously need server-side code.
Generating a torrent file involves: adding the files you want to the torrent, and adding tracker info. Some popular trackers are:
http://open.tracker.thepiratebay.org/announce
http://www.torrent-downloads.to:2710/announce
To create the .torrent file, you'll have to read the about the format of the file. A piece of Java that generates .torrent files is given at https://stackoverflow.com/a/2033298/384155
I have an MVC 4 application with a button for taking a photo that opens up a new window with javascript which contains a silverlight application in it. The silverlight application can then take a photo using the webcam and store it as a Writeable Bitmap. What I would like to do is then push that bitmap onto an action in my controller for saving to the database and refreshing the view.
I know I need to send the image as a post to my controller, but any code examples or suggestions on how I would go about doing that would be greatly appreciated. I think it should work as follows, Button Click for saving the image in my silverlight application would call a POST to the MVC controller and attach the image stream as a parameter in the controller, and the controller can then take the stream and push it up to the database then I can close the silverlight window. Just not sure how to go about coding that.
You could send the image using a WebClient. Let's suppose that you have the image inside your Silverlight application in a byte array:
byte[] image = ... get the image from your webcam
var client = new WebClient();
var uri = new Uri("http://example.com/photos/upload");
client.OpenWriteCompleted += (sender, e) =>
{
var buffer = (byte[])e.UserState;
e.Result.Write(buffer, 0, buffer.Length);
e.Result.Close();
};
client.OpenWriteAsync(uri, "POST", image);
and on the MVC side:
[HttpPost]
public ActionResult Upload()
{
byte[] image = new byte[Request.InputStream.Length];
Request.InputStream.Read(image, 0, image.Length);
// TODO: do something with the uploaded image here ...
}
Thank you for the reply. This is exactly what I was looking for, however ive run into a problem. Silverlight gives me the webcam snapshot as a WriteableBitmap type. Which I then tried to convert to a byte[] array before sending it over to MVC. It is saving to the database successfully, however it does not appear to be a valid image when I try to pull it back out from the database and display it. Is there an issue that you can see with my conversion code? Or perhaps can I send it over as an image type, or can I only send over byte[] arrays through http posts like this?
In my Silverlight application:
private void SendImage()
{
var client = new WebClient();
var uri = new Uri("http://localhost:4600/GuestBadge/GetCameraImage");
client.OpenWriteCompleted += (sender, e) =>
{
var buffer = (byte[])e.UserState;
e.Result.Write(buffer, 0, buffer.Length);
e.Result.Close();
};
client.OpenWriteAsync(uri, "POST", ToByteArray(SnapShot));
}
public static byte[] ToByteArray(WriteableBitmap bmp)
{
// Init buffer
int w = bmp.PixelWidth;
int h = bmp.PixelHeight;
int[] p = bmp.Pixels;
int len = p.Length;
byte[] result = new byte[4 * w * h];
// Copy pixels to buffer
for (int i = 0, j = 0; i < len; i++, j += 4)
{
int color = p[i];
result[j + 0] = (byte)(color >> 24); // A
result[j + 1] = (byte)(color >> 16); // R
result[j + 2] = (byte)(color >> 8); // G
result[j + 3] = (byte)(color); // B
}
return result;
}
And in my controller:
[HttpPost]
public ActionResult GetCameraImage()
{
byte[] image = new byte[Request.InputStream.Length];
Request.InputStream.Read(image, 0, image.Length);
var getPerson = (from a in db.Persons where a.PersonID == 3 select a).FirstOrDefault();
getPerson.Picture = image;
db.SaveChanges();
return null;
}
I ended up using FJCore http://code.google.com/p/fjcore/ to encode my WriteableBitmap into JPEG and then converted that to BASE64 using code I found at this question Using FJCore to encode Silverlight WriteableBitmap THANKS!. Then in turn converted that out to a byte[] array and sent it to MVC using your code and now its working great. I'm pretty new at all this stuff and didn't quite understand the encoding process enough before. Below is the code I used for this. Thanks again for your help!
private static string GetBase64Jpg(WriteableBitmap bitmap)
{
int width = bitmap.PixelWidth;
int height = bitmap.PixelHeight;
int bands = 3;
byte[][,] raster = new byte[bands][,];
for (int i = 0; i < bands; i++)
{
raster[i] = new byte[width, height];
}
for (int row = 0; row < height; row++)
{
for (int column = 0; column < width; column++)
{
int pixel = bitmap.Pixels[width * row + column];
raster[0][column, row] = (byte)(pixel >> 16);
raster[1][column, row] = (byte)(pixel >> 8);
raster[2][column, row] = (byte)pixel;
}
}
ColorModel model = new ColorModel { colorspace = ColorSpace.RGB };
FluxJpeg.Core.Image img = new FluxJpeg.Core.Image(model, raster);
MemoryStream stream = new MemoryStream();
JpegEncoder encoder = new JpegEncoder(img, 90, stream);
encoder.Encode();
stream.Seek(0, SeekOrigin.Begin);
byte[] binaryData = new Byte[stream.Length];
long bytesRead = stream.Read(binaryData, 0, (int)stream.Length);
string base64String =
System.Convert.ToBase64String(binaryData,
0,
binaryData.Length);
return base64String;
}
private void SendImage()
{
var client = new WebClient();
var uri = new Uri("http://localhost:4600/GuestBadge/GetCameraImage");
client.OpenWriteCompleted += (sender, e) =>
{
var buffer = (byte[])e.UserState;
e.Result.Write(buffer, 0, buffer.Length);
e.Result.Close();
};
client.OpenWriteAsync(uri, "POST", Convert.FromBase64String(GetBase64Jpg(SnapShot)));
}
I'm comunicationg with a email gateway. That gateway has an specific ip and port.
The requests the gateway are JSON formated and the gateway normally responds first whith an proceeding state and then with a confirmation or error state, represented also in JSON.
The code to make the requests and receive the response is:
using System;
using System.IO;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Collections.Generic;
using System.Threading;
using Microsoft.Win32;
public class TcpClientSample
{
public static void SendMessage(TcpClient client, string msg)
{
Console.WriteLine("REQUEST:" + msg);
NetworkStream stream = client.GetStream();
byte[] myWriteBuffer = Encoding.ASCII.GetBytes(msg);
stream.Write(myWriteBuffer, 0, myWriteBuffer.Length);
byte[] myWriteBuffer2 = Encoding.ASCII.GetBytes("\r\n");
stream.Write(myWriteBuffer2, 0, myWriteBuffer2.Length);
string gResponse = "";
BinaryReader r = new BinaryReader(stream);
int receivedMessages = 0;
while (true)
{
while (true)
{
char currentChar = r.ReadChar();
if (currentChar == '\n')
break;
else
gResponse = gResponse + currentChar;
}
if (gResponse != "")
{
Console.WriteLine("RESPONSE:" + gResponse);
receivedMessages = receivedMessages + 1;
}
if (receivedMessages == 2)
{
break;
}
}
}
public static void Main()
{
List<string> messages = new List<string>();
for (int i = 0; i < 1; i++)
{
String msg = "{ \"user\" : \"James\", \"email\" : \"james#domain.pt\" }";
messages.Add(msg);
}
TcpClient client = new TcpClient();
client.Connect("someIp", somePort);
int sentMessages = 0;
int receivedMessages = 0;
foreach (string msg in messages)
{
Thread newThread = new Thread(() =>
{
sentMessages = sentMessages + 1;
Console.WriteLine("SENT MESSAGES: " + sentMessages);
SendMessage(client, msg);
receivedMessages = receivedMessages + 1;
Console.WriteLine("RECEIVED MESSAGES: " + receivedMessages);
});
newThread.Start();
}
Console.ReadLine();
}
}
If I send few emails (up to 10) the network stream is OK.
But if I send thousands of emails I get messed chars lie
:{iyo"asn ooyes" "ncd" 0,"s_d:"4379" nme" 92729,"er_u" ,"ed_t_i" 2#" p cin_d:"921891010-11:11.725,"s" 4663175D0105E6912ADAAFFF6FDA393367" rpy:"rcein"
Why is this?
Don't worry I'm not a spammer :D
When you write a message to a TCP socket, it'll respond with the sent data. When the buffer is full, I expect it's 0, but you advance your send buffer anyway. You should advance it by the return value :)
Edit: it looks like you're using a stream abstraction which writes the internal buffer. The situation is the same. You are saying "the message has been completely sent" when the internal buffer state is not saying this, i.e. position does not equal limit. You need to keep sending until the remaining amount of buffer is 0 before moving on.
I solved this issue by having a single method just to read from the stream like this:
private TcpClient client;
private NetworkStream stream;
public void ListenFromGateway()
{
...
while (true)
{
byte[] bytes = new byte[client.ReceiveBufferSize];
//BLOCKS UNTIL AT LEAST ONE BYTE IS READ
stream.Read(bytes, 0, (int)client.ReceiveBufferSize);
//RETURNS THE DATA RECEIVED
string returndata = Encoding.UTF8.GetString(bytes);
//REMOVE THE EXCEDING CHARACTERS STARTING ON \r
string returndata = returndata.Remove(returndata.IndexOf('\r'));
...
}
Thanks for the help