Develop Reference

C# - Unable to remove the back slashes in JSON

I am trying to construct a string which I want to use it to update a JSON.
The code is below
public string ConstructCylicLoop(string fieldName, int LoopCount, string BadDataLabel,string ImmediateParent)
{
string start = "";
string fullbody = "";
string end = "";
string body = "";
for (int i = 0; i < LoopCount; i++)
{
LoopTestData = (new ExcelUtilities().getAPITestData(ApplicationConfiguration.LoopSheetName));
body = "";
foreach (Dictionary<string, string> loopData in LoopTestData)
{
string ParentNode = "";
string Key = "";
string Data = "";
loopData.TryGetValue("ParentNode", out ParentNode);
loopData.TryGetValue("Key", out Key);
loopData.TryGetValue("Data", out Data);
if(ImmediateParent.Equals(ParentNode)) //&& Key.Equals(fieldName)
{
body = body + '"' + Key + '"' + ":" + '"' + Data + '"'+',';
}
}
body = body.Remove(body.Length - 1);
body = "{" + body + "},";
fullbody = fullbody + body;
}
fullbody = fullbody.Remove(fullbody.Length - 1);
return start + fullbody + end;
}
The issue with this code is it always returns a text like this
"{\"my_address_type\":\"primarypropertyaddress\",\"my_address-street\":\"52 Street\",\"my_address-suburb\":\"vinvent\",\"my_address-postcode\":\"2121\"}"
When I update this string to an JSON node, the server is not able to parse it and the issue is with the back slash. Is there a way to remove the back slash. so I get something like this..
"{"my_address_type":"primarypropertyaddress","my_address-street":"52 Street","my_address-suburb":"vinvent","my_address-postcode":"2121"}"
I tried all possibilities but not able to clear/remove the backslash. Any code snippet on removing the backslashes. Thanks in advance.

C# Youtibe Video Title

I've been looking around and all of the answers I've found are either not C#, use the V2.0 API or use a method that doesn't return a valid result for videos with embedding disabled.
Here's what I'm currently using, from a response I found a while back:
public string GetYouTubeTitle(string url)
{
string id = GetArgs(url, "v", '?');
WebClient client = new WebClient();
return "YouTube Video: \"" + GetArgs(client.DownloadString("http://youtube.com/get_video_info?video_id=" + id), "title", '&') + "\"";
}
public string GetArgs(string args, string key, char query)
{
int iqs = args.IndexOf(query);
string querystring = null;
if (iqs != -1)
{
querystring = (iqs < args.Length - 1) ? args.Substring(iqs + 1) : string.Empty;
NameValueCollection nvcArgs = HttpUtility.ParseQueryString(querystring);
return nvcArgs[key];
}
return string.Empty;
}
It works perfectly the first time round, but the second video I tested returned the error: "&errorcode=150&reason=This+video+contains+content+from+Studio71_1_1.+It+is+restricted+from+playback+on+certain+sites"
My goal is just to get the title of a youtube video given the URL. But everything I'm seeing is either vague as hell or is only valid for the 2.0 API which doesn't even work anymore.
EDIT: And at some point I might want to add more to the response such as the length of the video. So I would prefer to have the API working than to just use something like get_video_info if possible.
EDIT:
For completeness and to help anyone who might be looking at this later on this is what I've got now that works like I want:
string titleurl = "https://www.googleapis.com/youtube/v3/videos?part=snippet&id=" + GetArgs(url, "v", '?') + "&key=" + apikey;
string timeurl = "https://www.googleapis.com/youtube/v3/videos?id=" + GetArgs(url, "v", '?') + "&part=contentDetails&key=" + apikey;
HttpWebRequest titlerequest = (HttpWebRequest)WebRequest.Create(titleurl);
HttpWebResponse titleresponse = (HttpWebResponse)titlerequest.GetResponse();
Stream titlestream = titleresponse.GetResponseStream();
StreamReader titlereader = new StreamReader(titlestream);
string titlejson = titlereader.ReadToEnd();
Newtonsoft.Json.Linq.JObject jObject = Newtonsoft.Json.Linq.JObject.Parse(titlejson);
string title = (string)jObject["items"][0]["snippet"]["title"];
HttpWebRequest timerequest = (HttpWebRequest)WebRequest.Create(timeurl);
HttpWebResponse timeresponse = (HttpWebResponse)timerequest.GetResponse();
Stream timestream = timeresponse.GetResponseStream();
StreamReader timereader = new StreamReader(timestream);
string timejson = timereader.ReadToEnd();
Newtonsoft.Json.Linq.JObject jObjectTime = Newtonsoft.Json.Linq.JObject.Parse(timejson);
string time = ParseTime((string)jObjectTime["items"][0]["contentDetails"]["duration"]);
if (title.Length > 0 && time.Length > 0 && time != "0")
return "YouTube Video: \"" + title + "\" (" + time + ")";
else return error; //error is a preset generic error string
It's probably not the cleanest code around, but it's doing what I want. So I don't really mind.

You can get the video title by using the YouTube Data API v3:
You need to get your API key from Here:
Make a GET request to this URL as described in the documentation:
https://www.googleapis.com/youtube/v3/videos?part=snippet&id=v2AC41dglnM,kTHNpusq654&key=YourAPIKeyHere
Parse the response you get with something like Json.NET:

try this:
First you need to install VideoLibrary on your visual studio package manager :
**Install-Package VideoLibrary**
using VideoLibrary;
Let's make a function to get the YouTube video title:
public string getTitle (string url){
YouTube ytb = YouTube.Default; //starting point for YouTube actions
var vid = ytb.GetVideo(url); // gets a Video object with info about the video
string ttl = vid.Title;//get video Title
return ttl;
}

wpf webbrowser uri containing other language such as Korean

i have a trouble when i use MyWebBrowser.Source = new Uri(uri);
i want to add Korean to uri. but when i do it, i can see broken characters which was from Korean. i searched for solution, but i couldn't understand the way. someone instructs the way using encode/decode.. but, i don't know how to apply it to my code.
please help me
.
<Grid Background="White"><WebBrowser Name="MyWebBrowser" /></Grid>
public MainWindow()
{
InitializeComponent();
}
private void Window_Loaded(object sender, RoutedEventArgs e)
{
change_room();
}
private void change_room()
{
string room_name = "example";
string nick = "한글";// 한글 means Korean.
string uri = "http://" + room_name + ".com/chat?nick=" + nick ;
try
{
MyWebBrowser.Source = new Uri(uri);
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
string uri = "http://" + room_name + ".server.ohcs.uu.gl/chat?nick=" + HttpUtility.UrlEncode(nick,System.Text.Encoding.GetEncoding("euc-kr")`) + "&text=&sessid=" + room_name;
above code can't make Korean correct.

You should use the HttpUtility.UrlEncode method on strings that are from user input and strings that contain characters that'd break the URL/not get through correctly (ampersand, foreign chars, etc). This way, it'll be safe for use in a URL.
string uri = "http://" + HttpUtility.UrlEncode(room_name) + ".com/chat?nick=" + HttpUtility.UrlEncode(nick, System.Text.Encoding.GetEncoding("euc-kr"));
The HttpUtility class can be found in the assembly System.Web.dll. If there's an error relating to the namespace not being found, make sure to add the reference to System.Web.dll using the Add References dialog.

i add more explanations about solution i found.
this is xaml code <.WebBrowser x:Name="webBrowser" /.>
below is cs code
public room1()
{
string nick = "한글";
webBrowser.Navigate("http:/freechat.esy.es/minichat?chat=room1&nick=" + nick );
}
above codes are inappropriate because "한글" is not a regular letter i think.
UriBuilder builder = new UriBuilder("http://freechat.esy.es/minichat?chat=room1&nick=한글");
string url = builder.ToString();
WebBrowser web = new WebBrowser();
web.Navigate(url);
UriBuilder convert unregualr letters containing "한글"[string url] to regualr letters which can be accepted to web.
input letters : [http://freechat.esy.es/minichat?chat=room1&nick=한글]
translated letters by UriBuilder :
[http:/freechat.esy.es/minichat?chat=room1&nick=%ED%95%9C%EA%B8%80]
I found the answer. I'm currently using the following code and it now works fine.
string make_uri(string uri)
{
UriBuilder ub = new UriBuilder(uri);
string ubS = ub.ToString();
return ubS;
}
string send_uri { get; set; }
private void NavigateTo()
{
int cs = combo1.SelectedIndex;
if (DN == "Your Nick")
{
if (cs == 0) send_uri = ("http://freechat.esy.es/minichat?chat=room1" + mode + key);
else if (cs == 1) send_uri = ("http://freechat.esy.es/minichat?chat=chataa" + mode + key);
else if (cs == 2) send_uri = ("http://freechat.esy.es/minichat?chat=room2" + mode + key);
}
else
{
if (cs == 0) send_uri = (make_uri("http://freechat.esy.es/minichat?chat=room1&nick=" + DN + mode + key));
else if (cs == 1) send_uri = (make_uri("http://freechat.esy.es/minichat?chat=chataa&nick=" + DN + mode + key));
else if (cs == 2) send_uri = (make_uri("http://freechat.esy.es/minichat?chat=room2&nick=" + DN + mode + key));
}
webBrowser.Navigate(send_uri);
}

Unity3D XML(-RPC) and C#

I'm actually answering my own question here.
I must be the only person in the world who tried to do this but given that it has taken me about a week to work this out - I figured that if there is ever another person who wants to use XML(-RPC) in Unity - I'll save them a weeks hassle.
What I wanted to do is talk to one of our Game servers for things like leaderboards. This server "talks" XML-RPC and I soon figured out that that's not easy in Unity.

Build XML to send to our servers
I couldn't find a standard function in Unity to do this without adding very large amounts of overhead. So I build the following procedure instead.
public string buildXMLRPCRequest(Hashtable FieldArray,string MethodName)
{
string ReturnString = "";
ReturnString += "<?xml version=\"1.0\" encoding=\"iso-8859-1\"?>" +
"\n" + "<simpleRPC version=\"0.9\">" +
"\n" + "<methodCall>" +
"\n" + "<methodName>" + MethodName + "</methodName>" +
"\n" + "<vector type=\"struct\">";
ReturnString += buildNode(FieldArray);
ReturnString += "\n</vector>" +
"\n</methodCall>" +
"\n</simpleRPC>";
return ReturnString;
}
public string buildNode(Hashtable FieldArray)
{
string ReturnList = "";
foreach (DictionaryEntry Item in FieldArray) {
string TypeName = "int";
string NodeType = "scalar";
Type myType = Item.Value.GetType();
string fieldValue = "";
if (myType == typeof(string) ) {
TypeName = "string";
fieldValue = Item.Value.ToString();
}
if (myType == typeof(Hashtable) ) {
fieldValue = buildNode(Item.Value as Hashtable);
NodeType = "vector";
TypeName = "struct";
}
if (myType == typeof(int) ) {
fieldValue = Item.Value.ToString();
TypeName = "int";
}
var ThisNode = "\n<" + NodeType + " type=\"" + TypeName + "\" id=\"" + Item.Key + "\">" + fieldValue + "</" + NodeType + ">";
ReturnList += ThisNode;
}
return ReturnList;
}
The buildXMLRPCRequest is used to build XML. You hand it a HashTable with fields you want to encode which may include objects of the types: int, string or Hashtable. It will return a beautifully formated (Simple) XML-RPC string which is ready to go to our server.
Send
To send XML to our servers, you need to issue a POST request with the mime type set to text/xml. None of the standard C# methods can be used in Unity but using this with the output of the buildXMLRPCRequest logic works perfectly. What it does:
Sending in Unity
I used this code:
private void UnityPostXML( int Staging,
string WebServer,
string MethodName,
Hashtable FieldArray)
{
string WebServiceURL = "http://LIVESERVER/";
if (Staging == 1) {
WebServiceURL = "http://TESTSERVER";
}
// Encode the text to a UTF8 byte arrray
string XMLRequest = buildXMLRPCRequest(FieldArray,MethodName);
System.Text.Encoding enc = System.Text.Encoding.UTF8;
byte[] myByteArray = enc.GetBytes(XMLRequest);
// Get the Unity WWWForm object (a post version)
var form = new WWWForm();
var url = WebServiceURL;
// Add a custom header to the request.
// Change the content type to xml and set the character set
var headers = form.headers;
headers["Content-Type"]="text/xml;charset=UTF-8";
// Post a request to an URL with our rawXMLData and custom headers
var www = new WWW(WebServiceURL, myByteArray, headers);
// Start a co-routine which will wait until our servers comes back
StartCoroutine(WaitForRequest(www));
}
IEnumerator WaitForRequest(WWW www)
{
yield return www;
// check for errors
if (www.error == null)
{
Debug.Log("WWW Ok!: " + www.text);
} else {
Debug.Log("WWW Error: "+ www.error);
}
}
encode the XML to a ByteArray using UTF8
Create a new Unity WWWForm
Create a HashTable, store the current http headers (if any) and overwrite the content type to text/xml
Send that lot to the server
Set up a Coroutine which waits for the reply
Sending without Unity
I found that developing a library in C# (I use the standards version of MonoDevelop) is much simpler then using Unity for everything so the equivelant send logic in C# is below if wnat to do the same.
private string NormalXMLCall(int Staging,
string WebServer,
string MethodName,
Hashtable Fields)
{
// Figure out who to call
string WebServiceURL = "http://LIVSERVER";
if (Staging == 1) {
WebServiceURL = "http://TESTSERVER";
}
WebServiceURL += WebServer;
// Build the request
XmlRpcParser parser = new XmlRpcParser();
string XMLRequest = parser.buildXMLRPCRequest(Fields,MethodName);
// Fire it off
HttpWebRequest httpRequest =(HttpWebRequest)WebRequest.Create(WebServiceURL);
httpRequest.Method = "POST";
//Defining the type of the posted data as XML
httpRequest.ContentType = "text/xml";
// string data = xmlDoc.InnerXml;
byte[] bytedata = Encoding.UTF8.GetBytes(XMLRequest);
// Get the request stream.
Stream requestStream = httpRequest.GetRequestStream();
// Write the data to the request stream.
requestStream.Write(bytedata, 0, bytedata.Length);
requestStream.Close();
//Get Response
HttpWebResponse httpResponse = (HttpWebResponse)httpRequest.GetResponse();
// Get the stream associated with the response.
Stream receiveStream = httpResponse.GetResponseStream ();
// Pipes the stream to a higher level stream reader with the required encoding format.
StreamReader readStream = new StreamReader (receiveStream, Encoding.UTF8);
string ReceivedData = readStream.ReadToEnd ();
httpResponse.Close ();
readStream.Close ();
return ReceivedData;
}
}
Extract data from XML
I wrote a simple parser. The constructor for the below findNode function should be given the raw XML data and the child node object you want to find. It will return the value of that node (as a string) if that node can be found on the highest level of the XML string or null if it can't find it. This parser is specific to "Simple XML-RPC" and needs a bit of work to decode encoded characters but that should be simple to add.
public string findNode(string Xml,string SearchForTag) {
int NestCounter = 0;
bool FoundTag = false;
int FoundTagLevel = 0;
string ReturnValue = null;
// Break it down by "<"
string [] TagArray = Xml.Split('<');
for (int i=0;i<TagArray.Length;i++) {
if (i>175 && i<180) {
int Hello=1;
}
string ThisLine = "<" + TagArray[i];
if (ThisLine.Length <= 1) continue;
if ((ThisLine.Length >= 2) && (ThisLine.Substring(0,2) == "<?")) continue;
if ((ThisLine.Length >= 3) && (ThisLine.Substring(0,3) == "<--")) continue;
// It can be a vector or a scalar - vectors are full of scalars so we'll
ThisLine = ThisLine.Replace(" "," ");
ThisLine = ThisLine.Replace("</","</");
string [] FieldArray = ThisLine.Split(' ');
bool AddLineToResult = FoundTag;
// Nest counter is the level we are operating on. We only check the first
// Level. When a vector is found we increase the NestCount and we won't
// search for the ID
if (NestCounter <= 1) { // Initial array we are looking on level 1
for (int a=0;a<FieldArray.Length;a++) {
string ThisTag = FieldArray[a];
string [] TagValue = ThisTag.Split("=\"".ToCharArray(),5);
// Every TagValue is xx=yy pair... we want "ID=\"xxx\"
if (TagValue.Length >= 3) {
string TagName = TagValue[2];
if (TagName == SearchForTag) {
FoundTag = true;
FoundTagLevel = NestCounter;
// This could be a vector or Scalar so find the ">" in this string
// and start adding from there
int TerminatePos = ThisLine.IndexOf(">");
if ((TerminatePos >= 0) && (TerminatePos < ThisLine.Length)) {
ReturnValue = ThisLine.Substring(TerminatePos+1);
}
break;
}
}
}
}
if (FieldArray.Length > 0) {
string ThisField = FieldArray[0].ToLower();
/*
* If we are in the loop where we have found the tag,
* we haven't changed level and this is the end of a scalar it must
* mean that the tag was a scalar so we can safely leave now.
*/
if ((FoundTag) && (FoundTagLevel == NestCounter) && (ThisField == "</scalar>")) {
break;
// return ReturnValue;
}
// If we end or leave a vector we change the NestCounter
if (ThisField.IndexOf("<vector") >= 0) {
NestCounter++;
}
else if (ThisField.IndexOf("</vector>") >= 0) {
NestCounter--;
}
}
// If we have found our tag and the nest counte goes below the level
// we where looking at - it's time to leave
if (FoundTag) {
if (NestCounter <= FoundTagLevel) {
break;
//return ReturnValue;
}
}
if (AddLineToResult) {
ReturnValue += ThisLine;
}
}
// You may wanna do some url decoding here....
return ReturnValue;
}

401 Error when trying to get Request Token

resp = (HttpWebResponse)request.GetResponse();Right I know this is probably some stupid mistake or just me not being well versed in Oauth stuff but I have come to a grinding halt and have no idea where to go from here, after many searches and attempts I humbly ask for some help.
I am attempting to get a request token from Twitter to try and get a users twitter feeds, I cannot use a library for other business reasons...
Here is the code so far:
Dictionary<string, string> parameters = new Dictionary<string, string>();
parameters.Add("oauth_callback", "www.url.com/redirect.aspx");
parameters.Add("oauth_consumer_key", <Consumer_KEY>);
parameters.Add("oauth_nonce", generateNonce());
parameters.Add("oauth_signature_method", "HMAC-SHA1");
parameters.Add("oauth_timestamp", CurrentUNIXTimestamp.Get());
parameters.Add("oauth_version", "1.0");
parameters = parameters.OrderBy(x => x.Key).ToDictionary(v => v.Key, v => v.Value);
string concat = "";
string OAuthHeader = "OAuth ";
foreach (string k in parameters.Keys)
{
if (k == "oauth_callback")
{
concat += k + "%3D" + EncodeToUpper(parameters[k]) + "%26";
OAuthHeader += k + "=" + "\"" + EncodeToUpper(parameters[k]) + "\", ";
}
else
{
concat += k + "%3D" + parameters[k] + "%26";
OAuthHeader += k + "=" + "\"" + parameters[k] + "\", ";
}
}
concat = concat.Remove(concat.Length - 3, 3);
concat = "POST&" + EncodeToUpper("https://api.twitter.com/oauth/request_token" ) + "&" + concat;
//byte[] content = Encoding.UTF8.GetBytes(concat);
HMACSHA1 hmacsha1 = new HMACSHA1();
hmacsha1.Key = Encoding.ASCII.GetBytes(string.Format("{0}&{1}", EncodeToUpper(<CONSUMER SECRET>, ""));
byte[] dataBuffer = System.Text.Encoding.ASCII.GetBytes(concat);
byte[] hashBytes = hmacsha1.ComputeHash(dataBuffer);
string hash = Convert.ToBase64String(hashBytes);
OAuthHeader += "oauth_signature=\"" + EncodeToUpper(hash) + "\"";
HttpWebRequest request = (HttpWebRequest)WebRequest.Create("https://api.twitter.com/oauth/request_token");
request.Method = "POST";
request.Headers["Authorization"] = OAuthHeader;
StringBuilder responding = new StringBuilder();
HttpWebResponse resp = null;
try
{
resp = (HttpWebResponse)request.GetResponse();
}
catch (WebException exc)
{
lblError.Text = "Error Connecting to Social Network " + exc.Message;
}
if (resp != null)
{
using (StreamReader reader = new StreamReader(resp.GetResponseStream()))
{
responding.Append(reader.ReadToEnd());
}
}
An Example of the Nonce is "ne8ehvVr0pW2EUxNHdxdyqbi8Fwphatt3SW1yerTyXH" and the CurrentUNIXTimestamp is generated by
public static class CurrentUNIXTimestamp
{
public static string Get()
{
return Convert.ToString((int)(DateTime.UtcNow - new DateTime(1970, 1, 1, 0, 0, 0)).TotalSeconds);
}
}
I have tried as many things as I can think of, there is no longer a client/browser issue (which was many other answers), the server time is correct to British Summer Time (I don't know whether that would be an issue but I tried adding an hour to the unix time stamp still a 401.), and i have defined the callback url on the twitter app page
I have got the same app working with facebook (I know its different oauth but may help)
The actual error comes at resp = (HttpWebResponse)request.GetResponse();, which comes up with a 401 error. I couldn't get any further details from the exc.response object, could anyone say how to get something useful out of the error in VS2008?
Thanks for any answers

The hardest problem I had implementing OAuth was dealing with character encoding. It's very particular.
Here is the code I ended up writing for it.
private static string UrlEncode(IEnumerable<KeyValuePair<string, object>> parameters)
{
StringBuilder parameterString = new StringBuilder();
var paramsSorted = from p in parameters
orderby p.Key, p.Value
select p;
foreach (var item in paramsSorted)
{
if (parameterString.Length > 0)
{
parameterString.Append("&");
}
if(item.Value.GetType() == typeof(string) )
parameterString.Append(
string.Format(
CultureInfo.InvariantCulture,
"{0}={1}",
UrlEncode(item.Key),
UrlEncode(item.Value as string)));
}
return UrlEncode(parameterString.ToString());
}
public static string UrlEncode(string value)
{
if (string.IsNullOrEmpty(value))
{
return string.Empty;
}
value = Uri.EscapeDataString(value);
// UrlEncode escapes with lowercase characters (e.g. %2f) but oAuth needs %2F
value = Regex.Replace(value, "(%[0-9a-f][0-9a-f])", c => c.Value.ToUpper());
// these characters are not escaped by UrlEncode() but needed to be escaped
value = value
.Replace("(", "%28")
.Replace(")", "%29")
.Replace("$", "%24")
.Replace("!", "%21")
.Replace("*", "%2A")
.Replace("'", "%27");
// these characters are escaped by UrlEncode() but will fail if unescaped!
value = value.Replace("%7E", "~");
return value;
}
If you really get fed up, you can use the WebRequestBuilder class from my library to do all the OAuth stuff for you: http://www.twitterizer.net/