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  • What is the "Dispatcher" design pattern?

    - by Ben Farmer
    What is the "dispatcher" pattern and how would I implement it in code? I have a property bag of generic objects and would like to have the retrieval delegated to a generic method. Currently, I have properties looking for a specific key in the bag. For example: private Dictionary<String, Object> Foo { get; set; } private const String WidgetKey = "WIDGETKEY"; public Widget? WidgetItem { get { return Foo.ContainsKey(WidgetKey) ? Foo[WidgetKey] as Widget: null; } set { if (Foo.ContainsKey(WidgetKey)) Foo[WidgetKey] = value; else Foo.Add(WidgetKey, value); } } It was suggested that this could be more generic with the "dispatcher" pattern, but I've been unable to find a good description or example. I'm looking for a more generic way to handle the property bag store/retrieve.

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  • Are all public read/write members serialized with XmlSerializer?

    - by David
    I have a handful of public read/write members that are not being serialized and I can't figure out why. Reviewing some code, and my root class is marked serializable: [Serializable] public class MyClass I have a default constructor that initializes 10-15 string members. There are about 50 public read/write string members in MyClass with get and set--no explicit serialization attributes are set on any of these. Serialization looks like this: XmlSerializer x = new XmlSerializer(typeof(MyClass)); TextWriter twWriter = new StreamWriter(sFileName); x.Serialize(twWriter, this); twWriter.Close(); only a handful (20-30) of these members are actually seralized to my xml file. what am i missing or misunderstanding about the XmlSerializer class?

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  • Javascript calls to an Ajax WebMethod. How to get multiple output params returned?

    - by George
    OK, I know how to call a simple old fashion asmx webservice webthod that returns a single value as a function return result. But what if I want to return multiple output params? My current approach is to separate the params by a dividing character and parse them on teh client. Is there a better way. Here's how I return a single function result. How do I return multiple output values? <asp:ScriptManager ID="ScriptManager1" runat="server"> <Services> <asp:ServiceReference Path="WebService.asmx" /> </Services> function CallHelloWebMethod() { WebService.Hello(OnComplete1, OnTimeOut, OnError); } function OnComplete1(arg) { alert(arg); } function OnTimeOut(arg) { } <WebMethod()> Public Function Hello(ByVal x As String) As String Return "Hello " & x End Function

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  • IOS where to put the configuration of facebook sdk

    - by Carol Smith
    I am trying to integrated my IOS 7 application with Facebook SDK I following this official tutorial https://developers.facebook.com/docs/ios/getting-started which states Configure the .plist Follow these three steps: Create a key called FacebookAppID with a string value, and add the app ID there. Create a key called FacebookDisplayName with a string value, and add the Display Name you configured in the App Dashboard. Create an array key called URL types with a single array sub-item called URL Schemes. Give this a single item with your app ID prefixed with fb. This is used to ensure the application will receive the callback URL of the web-based OAuth flow. The finished .plist should look something like this: My question is where to put these values? They already put this image, maybe it helps you to answer me Edit The problem that I don't have any plist file in my framework in xcode and I can't add a new one because if i did, I would have to add all the variables that you see in the image but the tutorial just stated about some of them

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  • Are delegates copied during assignment to an event?

    - by Sir Psycho
    Hi, The following code seems to execute the FileRetrieved event more than once. I thought delegates were a reference type. I was expecting this to execute once. I'm going to take a guess and say that the reference is being passed by value, therefore copied but I don't like guesswork :-) public delegate void DirListEvent<T>(T dirItem); void Main() { DirListEvent<string> printFilename = s => { Console.WriteLine (s); }; var obj = new DirectoryLister(); obj.FileRetrieved += printFilename; obj.FileRetrieved += printFilename; obj.GetDirListing(); } public class DirectoryLister { public event DirListEvent<string> FileRetrieved; public DirectoryLister() { FileRetrieved += delegate {}; } public void GetDirListing() { foreach (var file in Directory.GetFiles(@"C:\")) { FileRetrieved(file); } } }

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  • sqlite no such table

    - by Graham B
    can anyone please help. I've seen many people with the same problem and looked at all suggestions but still cannot get this to work. I have tried to unistall the application and install again, I have tried to change the version number and start again. I've debugged the code and it does go into the onCreate function, but when I go to make a select query it says the users table does not exist. Any help would greatly be appreciated. Thanks guys DatabaseHandler Class public class DatabaseHandler extends SQLiteOpenHelper { // Variables protected static final int DATABASE_VERSION = 1; protected static final String DATABASE_NAME = "MyUser.db"; // Constructor public DatabaseHandler(Context context) { super(context, DATABASE_NAME, null, DATABASE_VERSION); } // Creating Tables @Override public void onCreate(SQLiteDatabase db) { // Create the Users table // NOTE: I have the column variables saved above String CREATE_USERS_TABLE = "CREATE TABLE IF NOT EXISTS Users(" + KEY_PRIMARY_ID + " " + INTEGER + " " + PRIMARY_KEY + " " + AUTO_INCREMENT + " " + NOT_NULL + "," + USERS_KEY_EMAIL + " " + NVARCHAR+"(1000)" + " " + UNIQUE + " " + NOT_NULL + "," + USERS_KEY_PIN + " " + NVARCHAR+"(10)" + " " + NOT_NULL + ")"; db.execSQL(CREATE_USERS_TABLE); } // Upgrading database @Override public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { db.execSQL("DROP TABLE IF EXISTS Users"); onCreate(db); } UserDataSource class public class UserDataSource { private SQLiteDatabase db; private DatabaseHandler dbHandler; public UserDataSource(Context context) { dbHandler = new DatabaseHandler(context); } public void OpenWriteable() throws SQLException { db = dbHandler.getWritableDatabase(); } public void Close() { dbHandler.close(); } // Validate the user login with the username and password provided public void ValidateLogin(String username, String pin) throws CustomException { Cursor cursor = db.rawQuery( "select * from Users where " + DatabaseHandler.USERS_KEY_EMAIL + " = '" + username + "'" + " and " + DatabaseHandler.USERS_KEY_PIN + " = '" + pin + "'" , null); ........ } Then in the activity class, I'm calling UserDataSource uds = new UserDataSource (this); uds.OpenWriteable(); uds.ValidateLogin("name", "pin"); Any help would be great, thanks very much Graham The following is the attached log from the error report 11-23 17:47:46.414: I/SqliteDatabaseCpp(26717): sqlite returned: error code = 1, msg = no such table: Users, db=/data/data/prometric.myitemwriter/databases/MyUser.db 11-23 17:47:57.085: D/AndroidRuntime(26717): Shutting down VM 11-23 17:47:57.085: W/dalvikvm(26717): threadid=1: thread exiting with uncaught exception (group=0x40bec1f8) 11-23 17:47:57.171: D/dalvikvm(26717): GC_CONCURRENT freed 575K, 8% free 8649K/9351K, paused 2ms+6ms 11-23 17:47:57.179: E/AndroidRuntime(26717): FATAL EXCEPTION: main 11-23 17:47:57.179: E/AndroidRuntime(26717): java.lang.IllegalStateException: Could not execute method of the activity 11-23 17:47:57.179: E/AndroidRuntime(26717): at android.view.View$1.onClick(View.java:3091) 11-23 17:47:57.179: E/AndroidRuntime(26717): at android.view.View.performClick(View.java:3558) 11-23 17:47:57.179: E/AndroidRuntime(26717): at android.view.View$PerformClick.run(View.java:14152) 11-23 17:47:57.179: E/AndroidRuntime(26717): at android.os.Handler.handleCallback(Handler.java:605) 11-23 17:47:57.179: E/AndroidRuntime(26717): at android.os.Handler.dispatchMessage(Handler.java:92) 11-23 17:47:57.179: E/AndroidRuntime(26717): at android.os.Looper.loop(Looper.java:137) 11-23 17:47:57.179: E/AndroidRuntime(26717): at android.app.ActivityThread.main(ActivityThread.java:4514) 11-23 17:47:57.179: E/AndroidRuntime(26717): at java.lang.reflect.Method.invokeNative(Native Method) 11-23 17:47:57.179: E/AndroidRuntime(26717): at java.lang.reflect.Method.invoke(Method.java:511) 11-23 17:47:57.179: E/AndroidRuntime(26717): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:790) 11-23 17:47:57.179: E/AndroidRuntime(26717): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:557) 11-23 17:47:57.179: E/AndroidRuntime(26717): at dalvik.system.NativeStart.main(Native Method) 11-23 17:47:57.179: E/AndroidRuntime(26717): Caused by: java.lang.reflect.InvocationTargetException 11-23 17:47:57.179: E/AndroidRuntime(26717): at java.lang.reflect.Method.invokeNative(Native Method) 11-23 17:47:57.179: E/AndroidRuntime(26717): at java.lang.reflect.Method.invoke(Method.java:511) 11-23 17:47:57.179: E/AndroidRuntime(26717): at android.view.View$1.onClick(View.java:3086) 11-23 17:47:57.179: E/AndroidRuntime(26717): ... 11 more 11-23 17:47:57.179: E/AndroidRuntime(26717): Caused by: android.database.sqlite.SQLiteException: no such table: Users: , while compiling: select * from Users where email = '' and pin = '' 11-23 17:47:57.179: E/AndroidRuntime(26717): at android.database.sqlite.SQLiteCompiledSql.native_compile(Native Method) 11-23 17:47:57.179: E/AndroidRuntime(26717): at android.database.sqlite.SQLiteCompiledSql.<init>(SQLiteCompiledSql.java:68) 11-23 17:47:57.179: E/AndroidRuntime(26717): at android.database.sqlite.SQLiteProgram.compileSql(SQLiteProgram.java:143) 11-23 17:47:57.179: E/AndroidRuntime(26717): at android.database.sqlite.SQLiteProgram.compileAndbindAllArgs(SQLiteProgram.java:361) 11-23 17:47:57.179: E/AndroidRuntime(26717): at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:127) 11-23 17:47:57.179: E/AndroidRuntime(26717): at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:94) 11-23 17:47:57.179: E/AndroidRuntime(26717): at android.database.sqlite.SQLiteQuery.<init>(SQLiteQuery.java:53) 11-23 17:47:57.179: E/AndroidRuntime(26717): at android.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:47) 11-23 17:47:57.179: E/AndroidRuntime(26717): at android.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1685) 11-23 17:47:57.179: E/AndroidRuntime(26717): at android.database.sqlite.SQLiteDatabase.rawQuery(SQLiteDatabase.java:1659) 11-23 17:47:57.179: E/AndroidRuntime(26717): at projectname.database.UserDataSource.ValidateLogin(UserDataSource.java:73) 11-23 17:47:57.179: E/AndroidRuntime(26717): at projectname.LoginActivity.btn_login_Click(LoginActivity.java:47) 11-23 17:47:57.179: E/AndroidRuntime(26717): ... 14 more

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  • Avoiding dispose of underlying stream

    - by danbystrom
    I'm attempting to mock some file operations. In the "real" object I have: StreamWriter createFile( string name ) { return new StreamWriter( Path.Combine( _outFolder, name ), false, Encoding.UTF8 ) ); } In the mock object I'd like to have: StreamWriter createFile( string name ) { var ms = new MemoryStream(); _files.Add( Path.Combine( _outFolder, name ), ms ); return new StreamWriter( ms, Encoding.UTF8 ) ); } where _files is a dictionary to store created files for later inspection. However, when the consumer closes the StreamWriter, it also disposes the MeamoryStream... :-( Any thoughts on how to pursue this?

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  • Can anybody help me out with this error.?

    - by kumar
    Error during serialization or deserialization using the JSON JavaScriptSerializer. The length of the string exceeds the value set on the maxJsonLength property. Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.InvalidOperationException: Error during serialization or deserialization using the JSON JavaScriptSerializer. The length of the string exceeds the value set on the maxJsonLength property. in jquery gird on button click i am displaying something like 28000 rows? I know some of them are sujjested to define the JsonmaxLength in web config file.. but its not working for me? can anybody tell me about this? thanks

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  • PHP - HTML Purifier - hello w<o>rld/world tutorial striptags

    - by JW
    I am just looking into using HTML Purifier to ensure that a user-inputed string (that represents the name of a person) is sanitized. I do not want to allow any html tags, script, markup etc - I just want the alpha, numeric and normal punctuation characters. The sheer number of options available for HTML Purifier is daunting and, as far as i can see, the docs do not seem to have a beggining/middle or end see: http://htmlpurifier.org/docs Is there a simple hello world tutorial online that shows how to sanitize a string removing all the bad stuff out of it. I am also considering just using strip tags: http://php.net/manual/en/function.strip-tags.php or PHP's in built data sanitizing http://us.php.net/manual/en/book.filter.php

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  • How to access a field's value via reflection (Scala 2.8)

    - by soc
    Consider the following code: class Foo(var name: String = "bar") Now i try to get the value and the correct type of it via reflection: val foo = new Foo val field = foo.getDeclaredField("name") field.setAccessible(true) //This is where it doesn't work val value = field.get(????) I tried things like field.get(foo), but that just returns an java.lang.Object but no String. Basically I need the correct type, because I want to invoke a method on it (e. g. toCharArray). What is the suggested way to do that?

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  • Checking if an int is prime more efficiently

    - by SipSop
    I recently was part of a small java programming competition at my school. My partner and I have just finished our first pure oop class and most of the questions were out of our league so we settled on this one (and I am paraphrasing somewhat): "given an input integer n return the next int that is prime and its reverse is also prime for example if n = 18 your program should print 31" because 31 and 13 are both prime. Your .class file would then have a test case of all the possible numbers from 1-2,000,000,000 passed to it and it had to return the correct answer within 10 seconds to be considered valid. We found a solution but with larger test cases it would take longer than 10 seconds. I am fairly certain there is a way to move the range of looping from n,..2,000,000,000 down as the likely hood of needing to loop that far when n is a low number is small, but either way we broke the loop when a number is prime under both conditions is found. At first we were looping from 2,..n no matter how large it was then i remembered the rule about only looping to the square root of n. Any suggestions on how to make my program more efficient? I have had no classes dealing with complexity analysis of algorithms. Here is our attempt. public class P3 { public static void main(String[] args){ long loop = 2000000000; long n = Integer.parseInt(args[0]); for(long i = n; i<loop; i++) { String s = i +""; String r = ""; for(int j = s.length()-1; j>=0; j--) r = r + s.charAt(j); if(prime(i) && prime(Long.parseLong(r))) { System.out.println(i); break; } } System.out.println("#"); } public static boolean prime(long p){ for(int i = 2; i<(int)Math.sqrt(p); i++) { if(p%i==0) return false; } return true; } } ps sorry if i did the formatting for code wrong this is my first time posting here. Also the output had to have a '#' after each line thats what the line after the loop is about Thanks for any help you guys offer!!!

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  • HelloWebView Sample: now using SDK 3 and getting killed

    - by Tim
    Hey Folks, Well I was trying to get the HelloWebview example working with SDK 7 with no success (see HelloWebView Sample: java.lang.SecurityException: Permission Denial thread), so I decided just out of curiosity to back off to SDK3 to see if I could learn anything. I have been able to get all the "Layout" samples to work and decided to try something a little harder. Unfortunately, I still cannot get the simple HelloWebView app to run. I no longer get a Permission Denial but now the app is getting killed. Killed usually implies that there are not enough resources (memory etc.) for an application to run.... Any thoughts? Are there any other log files I can look at either on my computer or on the emulator? The main.xml, manifest, and console output are below. Let me know if you need more information. Thanks, Tim main.xml: <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" > <WebView android:id="@+id/webview" android:layout_width="fill_parent" android:layout_height="fill_parent"/> </LinearLayout> mainfest file: <uses-permission android:name="android.permission.INTERNET" /> <uses-sdk android:minSdkVersion="3" /> <application android:icon="@drawable/icon" android:label="@string/app_name"> <activity android:name=".HelloWebView3" android:label="@string/app_name"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> <activity android:name=".HelloWebView3" android:label="@string/app_name" android:theme="@android:style/Theme.NoTitleBar"> </activity> </application> Console output: [2010-06-05 08:43:37 - HelloWebView3] ------------------------------ [2010-06-05 08:43:37 - HelloWebView3] Android Launch! [2010-06-05 08:43:37 - HelloWebView3] adb is running normally. [2010-06-05 08:43:37 - HelloWebView3] Performing com.example.hellowebview3.HelloWebView3 activity launch [2010-06-05 08:43:37 - HelloWebView3] Automatic Target Mode: launching new emulator with compatible AVD 'Android1.5' [2010-06-05 08:43:37 - HelloWebView3] Launching a new emulator with Virtual Device 'Android1.5' [2010-06-05 08:43:42 - HelloWebView3] New emulator found: emulator-5554 [2010-06-05 08:43:42 - HelloWebView3] Waiting for HOME ('android.process.acore') to be launched... [2010-06-05 08:45:04 - HelloWebView3] HOME is up on device 'emulator-5554' [2010-06-05 08:45:04 - HelloWebView3] Uploading HelloWebView3.apk onto device 'emulator-5554' [2010-06-05 08:45:04 - HelloWebView3] Installing HelloWebView3.apk... [2010-06-05 08:45:19 - HelloWebView3] Success! [2010-06-05 08:45:19 - HelloWebView3] Starting activity com.example.hellowebview3.HelloWebView3 on device [2010-06-05 08:45:23 - HelloWebView3] ActivityManager: Starting: Intent { action=android.intent.action.MAIN categories={android.intent.category.LAUNCHER} comp={com.example.hellowebview3/com.example.hellowebview3.HelloWebView3} } [2010-06-05 08:45:23 - HelloWebView3] ActivityManager: [1] Killed am start -n com....

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  • Need help in displaying data insider marquee

    - by user59637
    Hi all, I want to display news inside the marquee markup in my banking application but its not happening.Please somebody help me what is the error in my code.Here is my code: <marquee bgcolor="silver" direction="left" id="marq1" runat="server" behavior="scroll" scrolldelay="80" style="height: 19px" width="565"> <% String se = Session["countnews"].ToString(); for (int i = 0; i < int.Parse("" +se); i++) { %> <strong><%Response.Write("&nbsp;&nbsp;" + Session["news"+i] + "&nbsp;&nbsp;"); %></strong> <% } %> </marquee> public class News { DataSet ds = new DataSet("Bank"); SqlConnection conn; String check; SqlDataAdapter sda; int i; public string News_Name; public int Count_News; public int newsticker() { conn = new SqlConnection(ConfigurationManager.ConnectionStrings["BankingTransaction"].ConnectionString.ToString()); check = "Select NewsTitle from News where NewsStatus = 'A'"; sda = new SqlDataAdapter(check, conn); sda.Fill(ds, "News"); if (ds.Tables[0].Rows.Count > 0) { for (i = 0; i < ds.Tables[0].Rows.Count; i++) { News_Name =i+ ds.Tables[0].Rows[i].ItemArray[0].ToString(); } Count_News = ds.Tables[0].Rows.Count; } else { News_Name =0+ "Welcome to WestSide Bank Online Web site!"; Count_News = 1; } return int.Parse(Count_News.ToString()); } protected void Page_Load(object sender, EventArgs e) { News obj = new News(); try { obj.newsticker(); Session["news"] = obj.News_Name.ToString(); Session["countnews"] = obj.Count_News.ToString(); } catch (SqlException ex) { Response.Write("Error in login" + ex.Message); Response.Redirect("Default.aspx"); } finally { obj = null; } }

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  • How can custom properties be added to a column in Doctrine

    - by murze
    With doctrine if you execute this code $columns = $accountTable->getColumns(); foreach ($columns as $column) { print_r($column); } you could get for example this as result: Array ( [type] => integer [length] => 20 [autoincrement] => 1 [primary] => 1 ) Array ( [type] => string [length] => 255 ) Is there a way to add custom properties to a column, so that the result would be: Array ( [type] => integer [length] => 20 [autoincrement] => 1 [primary] => 1 [customproperty] => customvalue ) Array ( [type] => string [length] => 255 )

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  • Change panel "visible" property on MasterPage from Child pages

    - by Vitor Reis
    I want to show some panel with a label that is located on a MasterPage from inside it's child pages.. I already did the coding on the MasterPage: public class MyMaster : MasterPage { public void ShowPanel(string pMessage) { labelInside.Text = pMessage; myPanel.visible = true; } } Then I make the calls from child pages: public void ShowPanel(string pMessage) { MyMaster masterPage = this.Master as MyMaster; masterPage.ShowPanel(pMessage); } This "works" ok, but it won't show nothing, since I need the page to be "refreshed" in an "ajax-way" like an UpdatePanel, which I can't use because the Trigger is in another page, right? I really need this to work.. even if you have another completely different way to do this, I would appreciate.

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  • Issue with 'selected' value within form

    - by JM4
    I currently have a form built in which after validation, if errors exist, the data stays on screen for the consumer to correct. An example of how this works for say the 'Year of Birth' is: <select name="DOB3"> <option value="">Year</option> <?php for ($i=date('Y'); $i>=1900; $i--) { echo "<option value='$i'"; if ($fields["DOB3"] == $i) echo " selected"; echo ">$i</option>"; } ?> </select> If an error is found, the year of birth value returns the year previously entered. I am able to have this work on all field with the exception of my 'State' field. I build the array and function for the drop down with the following code: <?php $states_arr = array('AL'=>"Alabama",'AK'=>"Alaska",'AZ'=>"Arizona",'AR'=>"Arkansas",'CA'=>"California",'CO'=>"Colorado",'CT'=>"Connecticut",'DE'=>"Delaware",'DC'=>"District Of Columbia",'FL'=>"Florida",'GA'=>"Georgia",'HI'=>"Hawaii",'ID'=>"Idaho",'IL'=>"Illinois", 'IN'=>"Indiana", 'IA'=>"Iowa", 'KS'=>"Kansas",'KY'=>"Kentucky",'LA'=>"Louisiana",'ME'=>"Maine",'MD'=>"Maryland", 'MA'=>"Massachusetts",'MI'=>"Michigan",'MN'=>"Minnesota",'MS'=>"Mississippi",'MO'=>"Missouri",'MT'=>"Montana",'NE'=>"Nebraska",'NV'=>"Nevada",'NH'=>"New Hampshire",'NJ'=>"New Jersey",'NM'=>"New Mexico",'NY'=>"New York",'NC'=>"North Carolina",'ND'=>"North Dakota",'OH'=>"Ohio",'OK'=>"Oklahoma", 'OR'=>"Oregon",'PA'=>"Pennsylvania",'RI'=>"Rhode Island",'SC'=>"South Carolina",'SD'=>"South Dakota",'TN'=>"Tennessee",'TX'=>"Texas",'UT'=>"Utah",'VT'=>"Vermont",'VA'=>"Virginia",'WA'=>"Washington",'WV'=>"West Virginia",'WI'=>"Wisconsin",'WY'=>"Wyoming"); function showOptionsDrop($array, $active, $echo=true){ $string = ''; foreach($array as $k => $v){ $s = ($active == $k)? ' selected="selected"' : ''; $string .= '<option value="'.$k.'"'.$s.'>'.$v.'</option>'."\n"; } if($echo) { echo $string;} else { return $string;} } ?> I then call the function from within the form using: <td><select name="State"><option value="">Choose a State</option><?php showOptionsDrop($states_arr, null, true); ?></select></td> Not sure what I'm missing but would love any assistance if somebody sees the error in my code. Thanks!

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  • Paypal - DoExpressCheckoutPayment null pointer

    - by user969894
    String nvpstr = "&TOKEN=" + token + "&PAYERID=" + payerID + "&PAYMENTREQUEST_0_PAYMENTACTION=" + paymentType + "&PAYMENTREQUEST_0_AMT=" + finalPaymentAmount + "&PAYMENTREQUEST_0_CURRENCYCODE=" + currencyCodeType + "&IPADDRESS=" + serverName; Having done an earlier call to SetExpressCheckout, I had to change a few parameter names because Paypal had changed it in the documentation but not in the code from the integration wizard. Now for DoExpressCheckoutPayment I've modified a few but I get a null pointer at strAck: HashMap nvp = httpcall("DoExpressCheckoutPayment", nvpstr); String strAck = nvp.get("ACK").toString(); if (strAck.equalsIgnoreCase("Success")) { return nvp; } Not sure what is wrong, any suggestions for debugging this or possible solutions?

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  • HttpResponse.Filter how determine End of stream

    - by Erik
    I got a HttpResponse.Filter filter that replaces text in the HTML. I've created a class that derives from Stream and implemented the Write method: public override void Write(byte[] buffer, int offset, int count) I read all bytes from buffer and store them in a private StringBuilder, then I replace the text, and write the string back to the Stream. But how can I determine when the stream is at the end of the stream. I.e. how do I determine when to write back the html (string) to the stream?

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  • rails 3.0.3 - ActiveRecord::Relation, undefined method error

    - by brg
    I am having this unexplained ActiveRecord::Relation, undefined method error . I don't know why, since my model association are well defined and the event table has the foreign keys for the user table. I tried using this fix but it failed: Rails 3 ActiveRecord::Relation random associations behavior event.rb class Event < ActiveRecord::Base belongs_to :user attr_accessible :event_name, :Starts_at, :finish, :tracks end user.rb class User < ActiveRecord::Base has_many :events, :dependent = :destroy attr_accessible :name, :event_attributes accepts_nested_attributes_for :events, :allow_destroy = true end schema.rb ActiveRecord::Schema.define(:version = 20101201180355) do create_table "events", :force = true do |t| t.string "event_name" t.string "tracks" t.datetime "starts_at" t.datetime "finish" t.datetime "created_at" t.datetime "updated_at" t.integer "user_id" end end error message NoMethodError in Users#index undefined method `events' for # Extracted source (around line #10): 7: <%= sortable "Tracks" % 8: 10: <% @users.events.each do |event| % 11: <% debugger % 12: 13: <%= event.starts_at % Trace of template inclusion: app/views/users/index.html.erb Rails.root: C:/rails_project1/events_manager Application Trace | Framework Trace | Full Trace app/views/users/_event_user.html.erb:10:in _app_views_users__event_user_html_erb__412443848_34308540_1390678' app/views/users/index.html.erb:7:in_app_views_users_index_html_erb___603337143_34316016_0'

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  • Resolving type parameter values passed to ancester type using reflection

    - by Tom Tucker
    I've asked a similar question before, but this one is much more challenging. How do I find a value of a specific type parameter that is passed to an ancestor class or an interface implemented by one of its ancestor classes using reflection? I basically need to write a method that looks like this. // Return the value of the type parameter at the index passed to the parameterizedClass from the clazz. Object getParameterValue(Class<?> clazz, Class<?> parameterizedClass, int index) For the example below, getParameterValue(MyClass.class, Map.class, 1) would return String.class public class Foo<K, V> implements Map<K, V>{ } public class Bar<V> extends Foo<Integer, V> { } public class MyClass extends Bar<String> { } Thanks!

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  • Array.BinarySearch does not find item using IComparable

    - by Sir Psycho
    If a binary search requires an array to be sorted before hand, why does the following code work? string[] strings = new[] { "z", "a", "y", "e", "v", "u" }; int pos = Array.BinarySearch(strings, "Y", StringComparer.OrdinalIgnoreCase); Console.WriteLine(pos); And why does this code result return -1? public class Person : IComparable<Person> { public string Name { get; set; } public int Age { get; set; } public int CompareTo(Person other) { return this.Age.CompareTo(other.Age) + this.Name.CompareTo(other.Name); } } var people = new[] { new Person { Age=5,Name="Tom"}, new Person { Age=1,Name="Tom"}, new Person { Age=2,Name="Tom"}, new Person { Age=1,Name="John"}, new Person { Age=1,Name="Bob"}, }; var s = new Person { Age = 1, Name = "Tom" }; // returns -1 Console.WriteLine( Array.BinarySearch(people, s) );

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  • What is the differences between connectionstring and appsettings?

    - by n10i
    in one of the application i have been reffering connection string is stored in appsettings! till now i have been storeing the connection in <connectionstring/> element. But, what is the correct way? So my quetion is, What is the differences between <connectionstring> and <appsettings> in web.config, are there any specific reason why i should or should not be storing connection string in appsettings? Are there any rules / guidlines provided to follow? Or is this completely the choice of the developer?

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  • How to prevent direct access to my JSON service?

    - by FrankLy
    I have a JSON web service to return home markers to be displayed on my Google Map. Essentially, http://example.com calls the web service to find out the location of all map markers to display like so: http://example.com/json/?zipcode=12345 And it returns a JSON string such as: {"address": "321 Main St, Mountain View, CA, USA", ...} So on my index.html page, I take that JSON string and place the map markers. However, what I don't want to have happen is people calling out to my JSON web service directly. I only want http://example.com/index.html to be able to call my http://example.com/json/ web service ... and not some random dude calling the /json/ directly. Quesiton: how do I prevent direct calling/access to my http://example.com/json/ web service?

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  • linq NullReferenceException while checking for null reference

    - by Odrade
    I have the following LINQ query: List<FileInputItem> inputList = GetInputList(); var results = from FileInputItem f in inputList where ( Path.GetDirectoryName(f.Folder).ToLower().Trim() == somePath || Path.GetDirectoryName(f.Folder).ToLower().Trim() == someOtherPath ) && f.Expression == null select f; Every time this query is executed, it generates a NullReferenceException. If I remove the condition f.Expression == null or change it to f.Expression != null, the query executes normally (giving the wrong results, of course). The relevant bits of FileInputItem look like this: [Serializable] public class FileInputItem { [XmlElement("Folder")] public string Folder { get; set; } [XmlElement("Expression")] public string Expression { get; set; } /*SNIP. Irrelevant properties */ } I'm new to LINQ to objects, so I'm probably missing something fundamental here. What's the deal?

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  • In an extension method how do a create an object based on the implementation class

    - by Greg
    Hi, In an extension method how do a create an object based on the implementation class. So in the code below I wanted to add an "AddRelationship" extension method, however I'm not sure how within the extension method I can create an Relationship object? i.e. don't want to tie the extension method to this particular implementation of relationship public static class TopologyExtns { public static void AddNode<T>(this ITopology<T> topIf, INode<T> node) { topIf.Nodes.Add(node.Key, node); } public static INode<T> FindNode<T>(this ITopology<T> topIf, T searchKey) { return topIf.Nodes[searchKey]; } public static bool AddRelationship<T>(this ITopology<T> topIf, INode<T> parentNode, INode<T> childNode) { var rel = new RelationshipImp(); // ** How do I create an object from teh implementation // Add nodes to Relationship // Add relationships to Nodes } } public interface ITopology<T> { //List<INode> Nodes { get; set; } Dictionary<T, INode<T> > Nodes { get; set; } } public interface INode<T> { // Properties List<IRelationship<T>> Relationships { get; set; } T Key { get; } } public interface IRelationship<T> { // Parameters INode<T> Parent { get; set; } INode<T> Child { get; set; } } namespace TopologyLibrary_Client { class RelationshipsImp : IRelationship<string> { public INode<string> Parent { get; set; } public INode<string> Child { get; set; } } } public class TopologyImp<T> : ITopology<T> { public Dictionary<T, INode<T>> Nodes { get; set; } public TopologyImp() { Nodes = new Dictionary<T, INode<T>>(); } } thanks

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