Develop Reference

Spotify Search API - C# Code works but I get no result found

Dears,
I am querying Spotify API using the following code
public Spotify_Search_Result Search(string artist_name, string song_name, int limit=1) {
Spotify_Search_Result result = new Spotify_Search_Result();
string text = artist_name + "%20" + song_name;
//string text = artist_name + "+" + song_name;
//string text = artist_name + " " + song_name;
//string text = Uri.EscapeDataString(artist_name) + " " + Uri.EscapeDataString(song_name);
//string text = Uri.EscapeDataString(artist_name) + "%20" + Uri.EscapeDataString(song_name);
//string text = Uri.EscapeDataString(artist_name) + "+" + Uri.EscapeDataString(song_name);
string url = "https://api.spotify.com/v1/search";
string query = url +
"?q="+
text+
"&type=track"+
"&offset=0"+
"&limit="+
limit.ToString();
HttpWebRequest webRequest = (HttpWebRequest)WebRequest.Create(query);
webRequest.Method = "GET";
webRequest.ContentType = "application/json";
webRequest.Accept = "application/json";
webRequest.Headers.Add("Authorization", "Bearer " + access_token);
String json = null;
try
{
HttpWebResponse resp = (HttpWebResponse)webRequest.GetResponse();
using (Stream respStr = resp.GetResponseStream())
{
using (StreamReader rdr = new StreamReader(respStr, Encoding.UTF8))
{
//should get back a string i can then turn to json and parse for accesstoken
json = rdr.ReadToEnd();
rdr.Close();
}
}
}
catch (Exception ex) {
Console.WriteLine("Spotify search result error: " + ex.Message + " ["+artist_name+"]-["+song_name+"]" );
}
if (json != null)
{
result = JsonConvert.DeserializeObject<Spotify_Search_Result>(json);
}
return result;
}
Problem: for certain values of artist_name and song_name this code returns no matching items.
Example: artist_name=Delta V
song_name=Il primo giorno del mondo
variable json value will be:
{
"tracks" : {
"href" : "https://api.spotify.com/v1/search?query=Delta+V+Il+Primo+Giorno+Del+Mondo&type=track&offset=0&limit=20",
"items" : [ ],
"limit" : 20,
"next" : null,
"offset" : 0,
"previous" : null,
"total" : 0
}
}
if I type same artist_name and song_name in SpotifyForDevelopers console I get a good match.
Now...where is the problem? I think it is the way I format the "text" and pass it to the API. I am not sure.
As you see from code I have tried different ways of formatting "text" variable.
Any hint on what I am doing wrong?
Thanks!

I think your code is correct and the problem could lie with the "market" parameter, i.e. songs can be available for some countries and unavailable for others.
Your example query will return the right result if you set the market to Italy (IT) but not when set to United States (US), for example (notice the added market=IT):
https://api.spotify.com/v1/search?query=elta%20V%20Il%20primo%20giorno%20del%20mondo&type=track&offset=0&limit=20&market=IT
Maybe setting the market correctly might help to reduce/avoid the issue.

how do i convert a string with multiple types in c#

I am getting a cast error for the Url value. Does anyone know how to cast a value to a string that contains multiple value types?
CmdRecipients = new OleDbCommand(QueryRecipients, ConnRecipients);
Recipients = CmdRecipients.ExecuteReader();
while (Recipients.Read())
{
Url = "https://bulktext.vodafone.ie/sendmessage.aspx"
+ "?user=user&password=user1!&api_id=89&to="
+ Recipients.GetString(8)
+ "&text=" + Confirmations.GetString(4)
+ "%0d%0a" + Confirmations.GetString(5)
+ "%0d%0a" + Confirmations.GetString(6)
+ "&from=Service";
Console.Write("Sending text to " + Recipients.GetString(8) + " ... ");
//Send SMS Here
HttpWebRequest req = WebRequest.Create(Url) as HttpWebRequest;
string result = null;
using (HttpWebResponse resp = req.GetResponse() as HttpWebResponse)
{
StreamReader reader = new StreamReader(resp.GetResponseStream());
result = reader.ReadToEnd();
if (result == "0\nRequest deferred successfully")
{
QueryRecipients = "UPDATE [Test].[dbo].[MessagesToSend] SET Previous_Status = Current_Status,"
+ "Current_Status = \"Sent\", DateTime_sent = Now() "
+ "WHERE Task_ID = \"" + Recipients.GetString(2) + "\";";
OleDbCommand Update = new OleDbCommand(QueryRecipients, ConnConfirmations);
Update.ExecuteNonQuery();
Console.WriteLine("Done!");
}
else
{
Console.WriteLine("The text wasn't delivered properly.");
}
}
}

Your question is a bit vague as you're not telling us where the exception is thrown, nor what the exception is exactly.
I would suspect that the problem lies in your use of Confirmations.GetString(x) and Recipients.GetString(x). As I understand, these are results from database calls. If the respective fields returned by the select don't contain strings, the GetString call will fail. You need to use the method that matches the field's type, like GetBoolean, GetInt32, etc.

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;
}

Payment succeeds, and our data matches querystring data, but falls thru to INVALID anyway!

Why does my ipn script I wrote always fail? It always goes to INVALID even though it matches everything in the query string that paypal sends to me?
notification.cshtml?tx=b78v54b5b55rby92S&st=Completed&amt=3.04&cc=USD&cm=&item_number=&merchant_return_link=Return+to+web+site+name&form_charset=UTF-8
And the part that checks it is:
string LiveURL = "https://www.paypal.com/cgi-bin/webscr";
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(LiveURL);
// Set request back values.
request.Method = "POST";
request.ContentType = "application/x-www-form-urlencoded";
byte[] parameters = Request.BinaryRead(HttpContext.Current.Request.ContentLength);
string RequestString = System.Text.Encoding.ASCII.GetString(parameters);
RequestString += "&cmd=_notify-validate";
request.ContentLength = RequestString.Length;
// Send request to PP and get response.
StreamWriter Sout = new StreamWriter(request.GetRequestStream(), System.Text.Encoding.ASCII);
Sout.Write(RequestString);
Sout.Close();
StreamReader Sin = new StreamReader(request.GetResponse().GetResponseStream());
string response = Sin.ReadToEnd();
Sin.Close();
if(result != null && result.OrderStatus == "Confirmed")
{
switch(response)
{
case "VERIFIED":
if(Request["st"] == "Completed")
{
var PPQuery = "SELECT TransactionId, OrderTotal FROM Orders WHERE OrderId = '" + Session["OSFOID"] + "' AND UserId = '" + WebSecurity.CurrentUserId + "'";
var ppQueryResult = database.Query(PPQuery);
foreach(var item in ppQueryResult)
{
decimal fff = 3.04M;
if(item["TransactionId"] != Request["tx"])
{
if(item["OrderTotal"] == TotalPrice)
{
// Payment was a success. Convey that to the user.
output = "Thanks. Order complete.";
}
else
{
// Possible fraud. Log it.
}
}
else
{
// This is a duplicate transaction. Log it and Redirect to homepage.
}
}
}
break;
case "INVALID":
output = "Invalid was returned. Investigate further.";
break;
default:
output = "Other exception has occured. Investigate further and log.";
break;
}
}

The code looks fine. The problem must be with response not matching "VERIFIED".
You're not in Turkey by chance, and changing response to uppercase prior to the comparison? *
*) If the locale is Turkey, uppercasing a string turns i into İ, not I (just one of the many traps with string manipulation)

Within the "VERIFIED" block, check:
if (Request.Params["payment_status"] == "Completed")
{
...
}
Request["st"] is incorrect.
Be sure to set IPN URL in one place in PayPal admin and do not use the other form of return URL checking (can't remember the name of it offhand) and IPN at the same time.
There is no "merchant_return_link" parameter; I think it should be "notify_url"... the URL string and the list of params doesn't look right to me; for example: &cm=&item_number
I know your list of params will be unique for your situation, but here's some sample code where I construct the URL to be passed to PayPal:
protected string GetPayPalURL(string SERVER_URL, string business, string[] itemNames,
int[] quantities, decimal[] amounts, double[] weight, string invoiceID, string transID, string NOTIFY_URL)
{
// Customer will be required to specify delivery address to PayPal - VERY IMPORTANT
const string NO_SHIPPING = "2";
StringBuilder url = new StringBuilder();
url.Append(SERVER_URL + "?cmd=_cart&upload=1");
url.Append("&business=" + HttpUtility.UrlEncode(business));
for (int i = 0; i < itemNames.Length; i++)
{
url.Append("&item_name" + "_" + (i + 1).ToString() + "=" + HttpUtility.UrlEncode(itemNames[i]));
url.Append("&quantity" + "_" + (i + 1).ToString() + "=" + quantities[i].ToString().Replace(",", "."));
url.Append("&amount" + "_" + (i + 1).ToString() + "=" + amounts[i].ToString().Replace(",", "."));
url.Append("&weight" + "_" + (i + 1).ToString() + "=" + weight[i].ToString().Replace(",", "."));
}
url.Append("&no_shipping=" + HttpUtility.UrlEncode(NO_SHIPPING));
url.Append("&custom=" + HttpUtility.UrlEncode(invoiceID));
url.Append("&txn_id=" + HttpUtility.UrlEncode(transID));
url.Append("&notify_url=" + HttpUtility.UrlEncode(NOTIFY_URL));
return url.ToString();
}

I think the Paypal method you are trying to do is as follows on code project
and if you get payment_status = INVALID, then check the reason in payment_reason

i dont see in the code where you are defining result which is checked in the if, also in the switch you are checking against request, surely this should be against response?

Google OAuth from Windows Phone invalid signature

I've spent the past couple nights on this, and it's driving me mad. Hopefully someone can shed some light on this.
I'm trying to write a Windows Phone 7 app to connect to Google. The OAuth routine is really giving me trouble.
I've seen quite a few twitter examples, but nothing specific to Google. The code is below - every time I make the request, Google says 'invalid signature.' The base URLs match, everything seems kosher - but it refuses to take it.
string baseReqUrl = "https://www.google.com/accounts/OAuthGetRequestToken";
string oauth_consumer_key = "CONSUMER_KEY";
string oauth_consumer_secret = "CONSUMER_SECRET";
string oauth_nonce = OAuthLibrary.OAuth.CreateNonce();
string oauth_signature_method = "HMAC-SHA1";
long oauth_timestamp = OAuthLibrary.OAuth.CreateTimestamp();
//string scope = "https%3A%2F%2Fwww.google.com%2Fanalytics%2Ffeeds%2F";
string scope = "https://www.google.com/analytics/feeds/";
string oauth_callback = "oob";
List<string> sig = new List<string>();
sig.Add(baseReqUrl);
sig.Add("oauth_callback=" + oauth_callback);
sig.Add("oauth_conusmer_key=" + oauth_consumer_key);
sig.Add("oauth_nonce=" + oauth_nonce);
sig.Add("oauth_signature_method=" + oauth_signature_method);
sig.Add("oauth_timestamp=" + oauth_timestamp.ToString());
sig.Add("scope=" + scope);
string baseReq = "GET";
int i = 0;
foreach (string s in sig)
{
if (i == 1)
{
baseReq = baseReq + "?" + s;
}
else
{
baseReq = baseReq + "&" + s;
}
i++;
}
HMACSHA1 h = new HMACSHA1(Encoding.UTF8.GetBytes(oauth_consumer_secret));
OAuth.OAuthBase b = new OAuth.OAuthBase();
string normalizedUrl = string.Empty;
string normalizedRequestParameters = string.Empty;
string sigBase = b.GenerateSignatureBase(new Uri(baseReq.Substring(4)), oauth_consumer_key, null, null, "GET", oauth_timestamp.ToString(), oauth_nonce, "HMAC-SHA1", out normalizedUrl, out normalizedRequestParameters);
string signature = b.GenerateSignatureUsingHash(sigBase, h);
string reqUrl = normalizedUrl + "?" + normalizedRequestParameters + "&oauth_signature=" + signature;
GetUrl(reqUrl); //this line just makes the request