Post Binary Data from console app

Question

Consider the following HTML code

<form action="upload.php" method="post" enctype="multipart/form-data">
    <input type="file" name="file">
</form>

Now I need to implement this using c#. I have the file in a byte array.

byte[] data;
String fileName;

So how do I do this. I think I have to create a suitable HTTP POST request . But how? I tried using the HttpWebRequest class. But don't know how to proceed.

HttpWebRequest oRequest = null;
oRequest = (HttpWebRequest)HttpWebRequest.Create("http://localhost/cs.php");
oRequest.ContentType = "multipart/form-data";
oRequest.Method = "POST";

Note : The file 'upload.php' is working perfectly with the HTML code.

possible duplicate of .NET: Simplest way to send POST with data and read response — Shai
– Shai, Commented Jan 5, 2014 at 11:21

i3arnon · Accepted Answer · 2014-01-05 13:07:18Z

3

make file upload control as runat server and try following code

int contentLength = fileUpload.PostedFile.ContentLength;
byte[] data = new byte[contentLength];
fileUpload.PostedFile.InputStream.Read(data, 0, contentLength);

// Prepare web request...
HttpWebRequest webRequest = (HttpWebRequest)WebRequest.Create("http://localhost/cs.php");
webRequest.Method = "POST";
webRequest.ContentType = "multipart/form-data";
webRequest.ContentLength = data.Length;
using (Stream postStream = webRequest.GetRequestStream())
{
    // Send the data.
    postStream.Write(data, 0, data.Length);
    postStream.Close();
 }

Update

// Create a request using a URL that can receive a post. 
WebRequest request = WebRequest.Create ("http://localhost/cs.php ");
// Set the Method property of the request to POST.
request.Method = "POST";
// Create POST data and convert it to a byte array.

byte[] byteArray = data;
// Set the ContentType property of the WebRequest.
request.ContentType = "application/x-www-form-urlencoded";
// Set the ContentLength property of the WebRequest.
request.ContentLength = byteArray.Length;
// Get the request stream.
Stream dataStream = request.GetRequestStream ();
// Write the data to the request stream.
dataStream.Write (byteArray, 0, byteArray.Length);
// Close the Stream object.
dataStream.Close ();
// Get the response.
WebResponse response = request.GetResponse ();
// Display the status.
Console.WriteLine (((HttpWebResponse)response).StatusDescription);
// Get the stream containing content returned by the server.
dataStream = response.GetResponseStream ();
// Open the stream using a StreamReader for easy access.
StreamReader reader = new StreamReader (dataStream);
// Read the content.
string responseFromServer = reader.ReadToEnd ();
// Display the content.
Console.WriteLine (responseFromServer);
// Clean up the streams.
reader.Close ();
dataStream.Close ();
response.Close ();

edited Jan 5, 2014 at 13:07

i3arnon

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answered Jan 5, 2014 at 11:38

santosh singh

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5 Comments

abhinav pandey Over a year ago

I am using a console based application as of now. Can not use the upload control.

santosh singh Over a year ago

It will not work in console app.Check my updated answer

abhinav pandey Over a year ago

So how do I send binary data over HTTP POST using a console app. I aleady have the file in a byte array.

abhinav pandey Over a year ago

I think the edited answer might work. But where am I putting in the attribute name? This is how I acess the file in php $_FILES["file"]["name"]

santosh singh Over a year ago

@abhinavpandey:I think php store the posted file information in $_FILES["file"["name"] variable.Please try my code and let me know if your are facing any issue

Cristian Ciupitu · Accepted Answer · 2015-05-29 22:39:20Z

1

You can use System.Net.WebClient:

using(WebClient client = new WebClient()) {
    client.UploadFile(address, filePath);
}

edited May 29, 2015 at 22:39

Cristian Ciupitu

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answered Jan 5, 2014 at 19:19

vtortola

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