Develop Reference

I am not able to post any comments in Google+

Post(Google+) not working.
I tried to implement post using Google+ Domains API v1 (https://developers.google.com/+/domains/getting-started )
Sending the request works, but GetResponse(), I get error like:
The remote server returned an error: (400) Bad Request.
I am trying using the below sample C# code that I got from Google+ API plus.me
var url = "https://www.googleapis.com/plusDomains/v1/people/me/activities?";
var googleParameters = AppendKeyvalue("access_token", access_token) + AppendKeyvalue("message", message);
var fullurl = url + googleParameters;
HttpWebRequest request= (HttpWebRequest)HttpWebRequest.Create(fullurl);
request.ContentType = " application/x-www-form-urlencoded ";
request.Method = "POST";
UTF32Encoding utfenc = new UTF32Encoding();
byte[] byteArray = utfenc.GetBytes(fullurl);
Stream postStream = request.GetRequestStream();
postStream.Write(byteArray, 0, byteArray.Length);
postStream.Close();
WebResponse response = request.GetResponse();
public static string AppendKeyvalue(string key, string value)
{
return string.Format("{0}={1}&", HttpUtility.UrlEncode(key), HttpUtility.UrlEncode(value));
}
For creating new post and comment I am referring this url https://developers.google.com/+/domains/posts/creating.
I tried to figure out a fix for it however the solution has not worked so far.

Http Request not sent from android C#

Iam developing a cross platform android app in Xamarin. I want to send a request to register my device. Iam sending my DeviceId, DeviceName and EncodedAccountName i.e my email id.
But I dont get any response. I have tested the request on Postman and get a proper response.
Here is my code:
StringBuilder registerContent = new StringBuilder();
registerContent.Append("DeviceId=").Append(deviceId).Append("&");
registerContent.Append("Name=").Append(deviceName).Append("&");
registerContent.Append("EncodedAccountName‏=").Append(username);
WebRequest request = WebRequest.Create(EndPoints.RegisterDeviceEndPoint);
// Set the Method property of the request to POST.
request.Method = "POST";
// Create POST data and convert it to a byte array.
string postData = registerContent.ToString();
byte[] byteArray = Encoding.UTF8.GetBytes(postData);
// 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();// Dont get any response here
// Display the status.
System.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.
System.Console.WriteLine(responseFromServer);
// Clean up the streams.
reader.Close();
dataStream.Close();
response.Close();
return response.ToString();
Any ideas on what might me going wrong?
Thanks

This is how I notify my Web API and wait for a string response:
string myParameters = "?firstParam=" + someParam1 + "&secondParam=" + someParam2;
string url = someHTTPAddress + myParameters;
stringResponseFromWebAPI = (new WebClient()).DownloadString(url);

Login and download image with C#

I need some images from a portal and they are only accessible if I login to the portal.
I need to do it with a C# program. I don't know what username field and password field are, because they use POST method. After loging in I want to enter some URLs that contain the images I want.
What should I do?
For logging in I'm using:
HttpWebRequest httpWReq = (HttpWebRequest)WebRequest.Create(#"http://mysite.com");
ASCIIEncoding encoding = new ASCIIEncoding();
string postData = "UsernameFieldName=Something";
postData += "&PasswordFieldName=SomethingElse";
byte[] data = encoding.GetBytes(postData);
httpWReq.Method = "POST";
httpWReq.ContentType = "application/x-www-form-urlencoded";
httpWReq.ContentLength = data.Length;
using (Stream stream = httpWReq.GetRequestStream())
{
stream.Write(data, 0, data.Length);
}
HttpWebResponse response = (HttpWebResponse)httpWReq.GetResponse();
string responseString = new StreamReader(response.GetResponseStream()).ReadToEnd();
Then for downloading image which is in another page I use:
using (var client = new WebClient())
{
string FileName = #"image.jpg";
client.DownloadFile("http://mysite.com/Image?imgCode=12345", FileName);
}

I don’t have a complete solution but here are some details to get you started.
Figure out what are post field simply by looking at page source
Once you send request for login you’ll also need to find a way to accept authentication cookie and then send it in all subsequent requests because their application most probably uses cookies.
After you are logged in you can download images like this
string imageFile = #"c:\image.jpg";
using (System.Net.WebClient client = new System.Net.WebClient())
{
client.DownloadFile("http://www.somewebsite.com/someimage.jpg", imageFile);
}
Here are couple examples to get you started with http posts in C#
HTTP request with post

Error while reading response from HttpWebRequest

I am trying to send contents of 1GB text file over the network. I modified the suggested code for basic authentication and kept it as follows :
WRequest = (HttpWebRequest)HttpWebRequest.Create(URL);
WRequest.Credentials = Credentials;
WRequest.PreAuthenticate = true;
WRequest.ContentType = "text/plain";
WRequest.Method = "POST";
WRequest.AllowWriteStreamBuffering = false;
WRequest.Timeout = 10000;
FileStream ReadIn = new FileStream(filename, FileMode.Open, FileAccess.Read);
ReadIn.Seek(0, SeekOrigin.Begin);
WRequest.ContentLength = ReadIn.Length;
Byte[] FileData = new Byte[ReadIn.Length];
int DataRead = 0;
Stream tempStream = WRequest.GetRequestStream();
do
{
DataRead = ReadIn.Read(FileData, 0, 2048);
if (DataRead > 0)
{
tempStream.Write(FileData, 0, DataRead);
Array.Clear(FileData, 0, 2048);
}
} while (DataRead > 0);
// The response
WResponse = (HttpWebResponse)WRequest.GetResponse();
However, now it gives me System.Net.ProtocolViolationException error : "You must write ContentLength bytes to the request stream before calling [Begin]GetResponse". I checked HttpWebRequest.BeginGetRequestResponse ... and found from debugging that the contentlength for WRequest is not -1. What else could be going wrong ? How should I get the response ?
Update :
The code which worked for small files is as followed :
WebRequest request = WebRequest.Create(url);
request.Method = "POST";
request.Credentials = Credentials;
using (StreamReader reader = new StreamReader(filename))
{
postData = reader.ReadToEnd();
}
byte[] byteArray = Encoding.UTF8.GetBytes(postData);
request.ContentType = "text/plain";
request.ContentLength = byteArray.Length;
Stream dataStream = request.GetRequestStream();
dataStream.Write(byteArray, 0, byteArray.Length);
dataStream.Close();
// The response
WebResponse response = request.GetResponse();
Console.WriteLine(((HttpWebResponse)response).StatusDescription);
dataStream = response.GetResponseStream();
using (StreamReader reader = new StreamReader(dataStream))
{
responseFromServer = reader.ReadToEnd();
}
dataStream.Close();
response.Close();

The article you referenced says
If the Microsoft Internet Information Services (IIS) Web server is configured to use Basic authentication, and you must set the HttpWebRequest.AllowWriteStreamBuffering property to false, you must send a HEAD request to pre-authenticate the connection before you send the POST or PUT request.
EDIT - now with more clarification!
To restate the article, if you want to send a large file to a destination which requires basic authentication, you'll need to issue two separate requests. The key here is that you are setting PreAuthenticate = true. Read the statement literally -- by setting the property to true, you are saying that you will authenticate any requests that you make before you actually attempt them! The framework doesn't know how you want to accomplish this pre-authentication, so you need to perform that action yourself, by sending a HEAD request to the destination. Think of the HEAD HTTP method as being a prologue to the actual request - it describes (or requests information about) a particular resource.
So the process goes like this:
Make a HEAD request to http://someurl/aresource containing the credentials you want to use when making future requests from this client to that server for the listed resource
The server will respond (ideally) with "OK - you may proceed. You're authenticated"
The server immediately regrets its' decision to allow the operation as it finds itself saving a very large file :-)
I don't see you making that HEAD request anywhere in the code you posted - if it's not already there, add this at the beginning of your code (snipped from the sample article ref in OP):
//preAuth the request
// You can add logic so that you only pre-authenticate the very first request.
// You should not have to pre-authenticate each request.
WRequest = (HttpWebRequest)HttpWebRequest.Create(URL);
// Set the username and the password.
WRequest.Credentials = new NetworkCredential(user, password);
WRequest.PreAuthenticate = true;
WRequest.UserAgent = "Upload Test";
WRequest.Method = "HEAD";
WRequest.Timeout = 10000;
WResponse = (HttpWebResponse)WRequest.GetResponse();
WResponse.Close();
// Make the real request.

HTTP POST in .NET doesn't work

I've got a problem with creating an HTTP post request in .NET. When I do this request in ruby it does work.
When doing the request in .NET I get following error:
<h1>FOXISAPI call failed</h1><p><b>Progid is:</b> carejobs.carejobs
<p><b>Method is:</b> importvacature/
<p><b>Parameters are:</b>
<p><b> parameters are:</b> vacature.deelnemernr=478
</b><p><b>GetIDsOfNames failed with err code 80020006: Unknown name.
</b>
Does anyone knows how to fix this?
Ruby:
require 'net/http'
url = URI.parse('http://www.carejobs.be/scripts/foxisapi.dll/carejobs.carejobs.importvacature')
post_args = {
'vacature.deelnemernr' => '478',
}
resp, data = Net::HTTP.post_form(url, post_args)
print resp
print data
C#:
Uri address = new Uri(url);
// Create the web request
HttpWebRequest request = WebRequest.Create(address) as HttpWebRequest;
// Set type to POST
request.Method = "POST";
request.ContentType = "application/x-www-form-urlencoded";
// Create the data we want to send
StringBuilder data = new StringBuilder();
data.Append("vacature.deelnemernr=" + HttpUtility.UrlEncode("478"));
// Create a byte array of the data we want to send
byte[] byteData = UTF8Encoding.UTF8.GetBytes(data.ToString());
// Set the content length in the request headers
request.ContentLength = byteData.Length;
// Write data
using (Stream postStream = request.GetRequestStream())
{
postStream.Write(byteData, 0, byteData.Length);
}
// Get response
using (HttpWebResponse response = request.GetResponse() as HttpWebResponse)
{
// Get the response stream
StreamReader reader = new StreamReader(response.GetResponseStream());
// Console application output
result = reader.ReadToEnd();
}
return result;

Don't you need the ? after the URL in order to do a post with parameters? I think that Ruby hides this behind the scenes.

I found the problem! The url variable in the C# code was "http://www.carejobs.be/scripts/foxisapi.dll/carejobs.carejobs.importvacature/"
It had to be "http://www.carejobs.be/scripts/foxisapi.dll/carejobs.carejobs.importvacature" without the backslash.