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Why does this code generate an error? [closed]

- by user559601

<link rel="search" type="application/opensearchdescription+xml" href="http://b.static.ak.fbcdn.net/rsrc.php/yJ/r/H2SSvhJMJA-.xml" title="" /> <link rel="shortcut icon" href="http://static.ak.fbcdn.net/rsrc.php/y7/r/5875srnzL-I.ico" /></head> <body class="WelcomePage UIPage_LoggedOut mac Locale_en_US"> <div id="FB_HiddenContainer" style="position:absolute; top:-10000px; width:0px; height:0px;" ></div> <div id="blueBar" class="loggedOut"></div> <div id="globalContainer"><div id="dialogContainer"></div><div id="dropmenu_container"></div> <div id="content" class="fb_content clearfix"><div > <div class="WelcomePage_Container"><div class="loggedout_menubar_container"><div class="clearfix loggedout_menubar"><a class="lfloat" href="/" title="Go to Home"><img class="fb_logo img" src="http://static.ak.fbcdn.net/rsrc.php/yp/r/kk8dc2UJYJ4.png" alt="Facebook logo" width="170" height="36" /></a><div class="rfloat"><div class="menu_login_container"><form method="POST" action="https://login.facebook.com/login.php?login_attempt=1" id="login_form" onsubmit="return Event.__inlineSubmit(this,event)"><input type="hidden" name="charset_test" value="€,´,€,´,?,?,?" /><input type="hidden" name="lsd" value="hEICz" autocomplete="off" /><input type="hidden" id="locale" name="locale" value="en_US" autocomplete="off" /><table cellspacing="0"><tr><td class="html7magic"><label for="email">Email</label></td><td class="html7magic"><label for="pass">Password</label></td></tr><tr><td><input type="text" class="inputtext" name="email" id="email" tabindex="1" /></td><td><input type="password" class="inputtext" name="pass" id="pass" tabindex="2" /></td><td><label class="uiButton uiButtonConfirm"><input value="Login" tabindex="4" type="submit" /></label></td></tr><tr><td class="login_form_label_field"><input type="checkbox" class="inputcheckbox" value="1" id="persistent" name="persistent" checked="1" /><input type="hidden" name="default_persistent" value="1" /><label id="label_persistent" for="persistent">Keep me logged in</label></td><td class="login_form_label_field"><a href="http://www.facebook.com/reset.php" rel="nofollow">Forgot your password?</a></td></tr></table><input type="hidden" name="charset_test" value="€,´,€,´,?,?,?" /><input type="hidden" id="lsd" name="lsd" value="hEICz" autocomplete="off" /></form> </div></div></div></div><div class="WelcomePage_MainSell"><div class="WelcomePage_MainSellCenter clearfix"><div class="WelcomePage_MainSellLeft"><div class="WelcomePage_MainMessage">Facebook helps you connect and share with the people in your life.</div><div class="WelcomePage_MainMap"> </div></div><div class="WelcomePage_MainSellRight"><div class="WelcomePage_SignUpSection"><div class="WelcomePage_SignUpMessage"><div class="WelcomePage_SignUpHeadline">Sign Up</div><div class="WelcomePage_SignUpSubheadline">It's free, and always will be.</div></div><div class="WelcomePage_SimpleReg" id="registration_container"><div><noscript><div id="no_js_box"><h2>Javascript is disabled on your browser.</h2><p>Please enable JavaScript on your browser or upgrade to a Javascript-capable browser to register for Facebook.</p></div></noscript><div id="simple_registration_container" class="simple_registration_container"><div id="reg_box"><form method="post" id="reg" name="reg" onsubmit="return function(event){return false;}.call(this,event)!==false && Event.__inlineSubmit(this,event)"><input type="hidden" autocomplete="off" name="post_form_id" value="c3a2bed7243b9a85f53d69f23a38da9d" /><input type="hidden" name="lsd" value="hEICz" autocomplete="off" /><input type="hidden" autocomplete="off" id="reg_instance" name="reg_instance" value="bpgeTawHFSiHa5-7SR4gbif7" /><input type="hidden" autocomplete="off" id="locale" name="locale" value="en_US" /><input type="hidden" autocomplete="off" id="terms" name="terms" value="on" /><input type="hidden" autocomplete="off" id="abtest_registration_group" name="abtest_registration_group" value="1" /><input type="hidden" autocomplete="off" id="referrer" name="referrer" value="" /><input type="hidden" autocomplete="off" id="md5pass" name="md5pass" value="" /><input type="hidden" autocomplete="off" id="validate_mx_records" name="validate_mx_records" value="1" /><input type="hidden" autocomplete="off" id="ab_test_data" name="ab_test_data" value="" /><div id="reg_form_box" class="large_form"><table class="uiGrid editor" cellspacing="0" cellpadding="1"><tbody><tr><td class="label">First Name:</td><td><div class="field_container"><input type="text" class="inputtext" id="firstname" name="firstname" /></div></td></tr><tr><td class="label">Last Name:</td><td><div class="field_container"><input type="text" class="inputtext" id="lastname" name="lastname" /></div></td></tr><tr><td class="label">Your Email:</td><td><div class="field_container"><input type="text" class="inputtext" id="reg_email__" name="reg_email__" /></div></td></tr><tr><td class="label">Re-enter Email:</td><td><div class="field_container"><input type="text" class="inputtext" id="reg_email_confirmation__" name="reg_email_confirmation__" /></div></td></tr><tr><td class="label">New Password:</td><td><div class="field_container"><input type="password" class="inputtext" id="reg_passwd__" name="reg_passwd__" value="" /></div></td></tr><tr><td class="label">I am:</td><td><div class="field_container"><div class="hidden_elem"><select><option></option><option></option></select><select><option></option><option></option></select></div><select class="select" name="sex" id="sex"><option value="0">Select Sex:</option><option value="1">Female</option><option value="2">Male</option></select></div></td></tr><tr><td class="label">Birthday:</td><td><div class="field_container"> <select class="" id="birthday_month" name="birthday_month" onchange="return run_with(this, ["editor"], function() {editor_date_month_change(this, "birthday_day", "birthday_year");});"><option value="-1">Month:</option><option value="1">Jan</option>

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Are Objective-C initializers allowed to share the same name?

- by NattKatt

I'm running into an odd issue in Objective-C when I have two classes using initializers of the same name, but differently-typed arguments. For example, let's say I create classes A and B: A.h: #import <Cocoa/Cocoa.h> @interface A : NSObject { } - (id)initWithNum:(float)theNum; @end A.m: #import "A.h" @implementation A - (id)initWithNum:(float)theNum { self = [super init]; if (self != nil) { NSLog(@"A: %f", theNum); } return self; } @end B.h: #import <Cocoa/Cocoa.h> @interface B : NSObject { } - (id)initWithNum:(int)theNum; @end B.m: #import "B.h" @implementation B - (id)initWithNum:(int)theNum { self = [super init]; if (self != nil) { NSLog(@"B: %d", theNum); } return self; } @end main.m: #import <Foundation/Foundation.h> #import "A.h" #import "B.h" int main (int argc, const char * argv[]) { NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init]; A *a = [[A alloc] initWithNum:20.0f]; B *b = [[B alloc] initWithNum:10]; [a release]; [b release]; [pool drain]; return 0; } When I run this, I get the following output: 2010-04-26 20:44:06.820 FnTest[14617:a0f] A: 20.000000 2010-04-26 20:44:06.823 FnTest[14617:a0f] B: 1 If I reverse the order of the imports so it imports B.h first, I get: 2010-04-26 20:45:03.034 FnTest[14635:a0f] A: 0.000000 2010-04-26 20:45:03.038 FnTest[14635:a0f] B: 10 For some reason, it seems like it's using the data type defined in whichever @interface gets included first for both classes. I did some stepping through the debugger and found that the isa pointer for both a and b objects ends up the same. I also found out that if I no longer make the alloc and init calls inline, both initializations seem to work properly, e.g.: A *a = [A alloc]; [a initWithNum:20.0f]; If I use this convention when I create both a and b, I get the right output and the isa pointers seem to be different for each object. Am I doing something wrong? I would have thought multiple classes could have the same initializer names, but perhaps that is not the case.

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Serialization of an object and its Contained Objects

- by Amit

There is a main class having 2 subClasses(each represent separate entity) and all classes needs to be serialized.. how should I proceed ? My requirement is when I serelize MainClass, I should get the xml for each sub class and main class as well. Thanks in advance... and if my approach is incorrect... correct that as well.. Ex given below... class MainClass { SubClass1 objSubclass1 = null; SubClass2 objSubclass2 = null; public MainClass() { objSubclass1 = new SubClass1(); objSubclass2 = new SubClass2(); } [XmlElement("SubClass1")] public SubClass1 SubClass1 {get {return objSubclass1;} } [XmlElement("SubClass2")] public SubClass2 SubClass2 {get {return objSubclass2;} } } Class SubClass1 { Some properties here... } Class SubClass2 { Some properties here... }

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Pass parameters to a user control - asp.net

- by Cristian Boariu

Hi, I have this user control: <user:RatingStars runat="server" product="<%= getProductId() %>" category="<%= getCategoryId() %>"></user:RatingStars> You see that i fill the product and category by calling two methods: public string getProductId() { return productId.ToString(); } public string getCategoryId() { return categoryId.ToString(); } I do not understand why, in the user control, when i take the data received (product and category) it gives me "<%= getProductId() %" instead of giving the id received from that method... Any help would be kindly appreciated...

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Why is an anonymous inner class containing nothing generated from this code?

- by Andrew Westberg

When run through javac on the cmd line Sun JVM 1.6.0_20, this code produces 6 .class files OuterClass.class OuterClass$1.class OuterClass$InnerClass.class OuterClass$InnerClass2.class OuterClass$InnerClass$InnerInnerClass.class OuterClass$PrivateInnerClass.class When run through JDT in eclipse, it produces only 5 classes. OuterClass.class OuterClass$1.class OuterClass$InnerClass.class OuterClass$InnerClass2.class OuterClass$InnerClass$InnerInnerClass.class OuterClass$PrivateInnerClass.class When decompiled, OuterClass$1.class contains nothing. Where is this extra class coming from and why is it created? package com.test; public class OuterClass { public class InnerClass { public class InnerInnerClass { } } public class InnerClass2 { } //this class should not exist in OuterClass after dummifying private class PrivateInnerClass { private String getString() { return "hello PrivateInnerClass"; } } public String getStringFromPrivateInner() { return new PrivateInnerClass().getString(); } }

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Overrided ToString doesn't show in debug

- by marco.ragogna

I have a collection similar to: Public Class MyCollection Inherits ObservableCollection(Of MyCollection) Private _Name As String Public Property Name() As String Get Return _Name End Get Set(ByVal value As String) _Name = value End Set End Property Public Overrides Function ToString() As String Return "Name: " & _Name End Function End Class I have overrided ToString method in order to help in debug, but it doesn't show up. In the code that follow if, during debug, I move the mouse over coll it shows me Count = 0 Private Sub Window1_Loaded(ByVal sender As Object, ByVal e As System.Windows.RoutedEventArgs) Handles Me.Loaded Dim coll As New MyCollection coll.Name = "Test" End Sub Do you know what could be the problem?

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Tile Engine: Entity location wrong

- by Trizicus

I've made a tile engine that has 30px by 30px. I've ran into a problem with an object for example. I've loaded an object 20px by 20px and when I do a collision check I have to use x/y position which is top left in Java2D. How can I do collision detection based on the entire object? This is relevant code: boolean checkCol() { int currentGridX = ship.getX()/30; int currentGridY = ship.getY()/30; if(test[currentGridX][currentGridY] == 0) return true; System.out.println("collision"); return false; }

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Returning messages in Smalltalk

- by Zachary

I have a Dictionary of objects I have created in smalltalk, which I am iterating over by enumerating it based on the key/value pairs. For value object in the dictionary, I am calling a method on that object. Based on certain conditions, I would like for this object to be able to add a new member to dictionary, and possibly delete another one. I've been looking at the 'Perform' and 'Messages' facilities in Smalltalk, but I'm not sure if it is even possible to do what I'm trying to do - is it possible to return a message (or multiple messages), which another object can process and perform? For example, could my method return 'removeKey: 19' and 'add object' at the same time? I am using GNU Smalltalk, if it matters.

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Python - what's your conventions to declare your attributes in a class ?

- by SeyZ

Hello, In Python, I can declare attributes all over the class. For example : class Foo: def __init__(self): self.a = 0 def foo(self): self.b = 0 It's difficult to retrieve all attributes in my class when I have a big class with a lot of attributes. Is it better to have the following code (a) or the next following code (b) : a) Here, it's difficult to locate all attributes : class Foo: def __init__(self): foo_1() foo_2() def foo_1(self): self.a = 0 self.b = 0 def foo_2(self): self.c = 0 b) Here, it's easy to locate all attributes but is it beautiful ? class Foo: def __init__(self): (self.a, self.b) = foo_1() self.c = foo_2() def foo_1(self): a = 0 b = 0 return (a, b) def foo_2(self): c = 0 return c In a nutshell, what is your conventions to declare your attributes in a class ?

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A simple string array Iteration in C# .NET doesn't work

- by met.lord

This is a simple code that should return true or false after comparing each element in a String array with a Session Variable. The thing is that even when the string array named 'plans' gets the right attributes, inside the foreach it keeps iterating only over the first element, so if the Session Variable matches other element different than the first one in the array it never returns true... You could say the problem is right there in the foreach cicle, but I cant see it... I've done this like a hundred times and I can't understand what am I doing wrong... Thank you protected bool ValidatePlans() { bool authorized = false; if (RequiredPlans.Length > 0) { string[] plans = RequiredPlans.Split(','); foreach (string plan in plans) { if (MySessionInfo.Plan == plan) authorized = true; } } return authorized; }

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Lua - initializing

- by Ockonal

Hello, I can't init lua correctly under Arch Linux. Lua - latest version. Here is my code: #include <stdio.h> extern "C" { #include <lua.h> #include <lauxlib.h> #include <lualib.h> } int main() { lua_State *luaVM = luaL_newstate(); if (luaVM == NULL) { printf("Error initializing lua!\n"); return -1; } luaL_openlibs(luaVM); lua_close(luaVM); return 0; } /tmp/cc0iJ6lW.o: In function main': test_lua.cpp:(.text+0xa): undefined reference toluaL_newstate' test_lua.cpp:(.text+0x34): undefined reference to `luaL_openlibs' test_lua.cpp:(.text+0x40): undefined reference to `lua_close' collect2: ld returned 1 exit status What's wrong?

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Is an ArrayList automatically declared static in Java, if it is an instance variable?

- by Alex

I'm trying to do something like this: private class aClass { private ArrayList<String> idProd; aClass(ArrayList<String> prd) { this.idProd=new ArrayList<String>(prd); } public ArrayList<String> getIdProd() { return this.idProd; } } So if I have multiple instances of ArrayLIst<String> (st1 ,st2 ,st3) and I want to make new objects of aClass: { aClass obj1,obj2,obj3; obj1=new aClass(st1); obj2=new aClass(st2); obj3=new aClass(st3); } Will all of the aClass objects return st3 if I access the method getIdProd() for each of them(obj1..obj3)? Is an ArrayList as an instance variable automatically declared static?

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Problem with skipping empty cells while importing data from .xlsx file in asp.net c# application

- by Eedoh

Hi to all. I have a problem with reading .xlsx files in asp.net mvc2.0 application, using c#. Problem occurs when reading empty cell from .xlsx file. My code simply skips this cell and reads the next one. For example, if the contents of .xlsx file are: FirstName LastName Age John 36 They will be read as: FirstName LastName Age John 36 Here's the code that does the reading. private string GetValue(Cell cell, SharedStringTablePart stringTablePart) { if (cell.ChildElements.Count == 0) return string.Empty; //get cell value string value = cell.ElementAt(0).InnerText;//CellValue.InnerText; //Look up real value from shared string table if ((cell.DataType != null) && (cell.DataType == CellValues.SharedString)) value = stringTablePart.SharedStringTable.ChildElements[Int32.Parse(value)].InnerText; return value; } private DataTable ExtractExcelSheetValuesToDataTable(string xlsxFilePath, string sheetName) { DataTable dt = new DataTable(); using (SpreadsheetDocument myWorkbook = SpreadsheetDocument.Open(xlsxFilePath, true)) { //Access the main Workbook part, which contains data WorkbookPart workbookPart = myWorkbook.WorkbookPart; WorksheetPart worksheetPart = null; if (!string.IsNullOrEmpty(sheetName)) { Sheet ss = workbookPart.Workbook.Descendants<Sheet>().Where(s => s.Name == sheetName).SingleOrDefault<Sheet>(); worksheetPart = (WorksheetPart)workbookPart.GetPartById(ss.Id); } else { worksheetPart = workbookPart.WorksheetParts.FirstOrDefault(); } SharedStringTablePart stringTablePart = workbookPart.SharedStringTablePart; if (worksheetPart != null) { Row lastRow = worksheetPart.Worksheet.Descendants<Row>().LastOrDefault(); Row firstRow = worksheetPart.Worksheet.Descendants<Row>().FirstOrDefault(); if (firstRow != null) { foreach (Cell c in firstRow.ChildElements) { string value = GetValue(c, stringTablePart); dt.Columns.Add(value); } } if (lastRow != null) { for (int i = 2; i <= lastRow.RowIndex; i++) { DataRow dr = dt.NewRow(); bool empty = true; Row row = worksheetPart.Worksheet.Descendants<Row>().Where(r => i == r.RowIndex).FirstOrDefault(); int j = 0; if (row != null) { foreach (Cell c in row.ChildElements) { //Get cell value string value = GetValue(c, stringTablePart); if (!string.IsNullOrEmpty(value) && value != "") empty = false; dr[j] = value; j++; if (j == dt.Columns.Count) break; } if (empty) break; dt.Rows.Add(dr); } } } } } return dt; }

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Operator + for matrices in C++

- by cibercitizen1

I suppose the naive implementation of a + operator for matrices (2D for instance) in C++ would be: class Matrix { Matrix operator+ (Matrix other) const { Matrix result; // fill result with *this.data plus other.data return result; } } so we could use it like Matrix a; Matrix b; Matrix c; c = a + b; Right? But if matrices are big this is not efficient as we are doing one not-necessary copy (return result). Therefore, If we wan't to be efficient we have to forget the clean call: c = a + b; Right? What would you suggest / prefer ? Thanks.

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Core Data Predicate To Many

- by Vikings

I have a core data model that has a one to many relationship, there is a category, and it can contain many subcategories. Category <---- Subcategory I am trying to perform a fetch that checks if a particular Category contains a Subcategory with a particular name. Let's say I have two categories below, I want to fetch to see if there are any subcategories name "Apple" in the Category named "Fruits". Vetegables - Carrot - Lettuce Fruits - Apple - Orange - Pear Code: - (SubCategory *)searchForSubCategoryWithName:(NSString *)subCategory inCategory:(Category *)category { NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init]; NSEntityDescription *entity = [NSEntityDescription entityForName:@"SubCategory" inManagedObjectContext:self.beer.managedObjectContext]; [fetchRequest setEntity:entity]; NSPredicate *predicate = [NSPredicate predicateWithFormat:@"name == [c] %@", subCategory]; [fetchRequest setPredicate:predicate]; NSError *error; NSArray *fetchedObjects = [self.beer.managedObjectContext executeFetchRequest:fetchRequest error:&error]; if (fetchedObjects != nil && fetchedObjects.count > 0) { return [fetchedObjects objectAtIndex:0]; } else { return nil; } }

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param : implicit EL (Expression Language) object in JSP

- by coffy

What if I have URL like: servlet.jsp?myparam=myvalue These 2 ELs should return output "myvalue" , but I actually don't understand why?: ${param.values["myparam"]["0"]} ${param.values.myparam[0]}

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What is the best strategy for populating a TableView from a service?

- by alrutherford

I have an application which has a potentially long running background process. I want this process to populate a TableView as results objects are generated. The results objects are added to an observableList and have properties which are bound to the columns in the usual fashion for JavaFX. As an example of this consider the following sample code Main Application import java.util.LinkedList; import javafx.application.Application; import javafx.collections.FXCollections; import javafx.collections.ObservableList; import javafx.event.ActionEvent; import javafx.event.EventHandler; import javafx.geometry.Insets; import javafx.scene.Group; import javafx.scene.Scene; import javafx.scene.control.Button; import javafx.scene.control.TableColumn; import javafx.scene.control.TableView; import javafx.scene.control.cell.PropertyValueFactory; import javafx.scene.layout.VBox; import javafx.stage.Stage; public class DataViewTest extends Application { private TableView<ServiceResult> dataTable = new TableView<ServiceResult>(); private ObservableList<ServiceResult> observableList; private ResultService resultService; public static void main(String[] args) { launch(args); } @Override public void start(Stage stage) { observableList = FXCollections.observableArrayList(new LinkedList<ServiceResult>()); resultService = new ResultService(observableList); Button refreshBtn = new Button("Update"); refreshBtn.setOnAction(new EventHandler<ActionEvent>() { @Override public void handle(ActionEvent arg0) { observableList.clear(); resultService.reset(); resultService.start(); } }); TableColumn<ServiceResult, String> nameCol = new TableColumn<ServiceResult, String>("Value"); nameCol.setCellValueFactory(new PropertyValueFactory<ServiceResult, String>("value")); nameCol.setPrefWidth(200); dataTable.getColumns().setAll(nameCol); // productTable.getItems().addAll(products); dataTable.setItems(observableList); Scene scene = new Scene(new Group()); stage.setTitle("Table View Sample"); stage.setWidth(300); stage.setHeight(500); final VBox vbox = new VBox(); vbox.setSpacing(5); vbox.setPadding(new Insets(10, 0, 0, 10)); vbox.getChildren().addAll(refreshBtn, dataTable); ((Group) scene.getRoot()).getChildren().addAll(vbox); stage.setScene(scene); stage.show(); } } Service public class ResultService extends Service<Void> { public static final int ITEM_COUNT = 100; private ObservableList<ServiceResult> observableList; /** * Construct service. * */ public ResultService(ObservableList<ServiceResult> observableList) { this.observableList = observableList; } @Override protected Task<Void> createTask() { return new Task<Void>() { @Override protected Void call() throws Exception { process(); return null; } }; } public void process() { for (int i = 0; i < ITEM_COUNT; i++) { observableList.add(new ServiceResult(i)); } } } Data public class ServiceResult { private IntegerProperty valueProperty; /** * Construct property object. * */ public ServiceResult(int value) { valueProperty = new SimpleIntegerProperty(); setValue(value); } public int getValue() { return valueProperty.get(); } public void setValue(int value) { this.valueProperty.set(value); } public IntegerProperty valueProperty() { return valueProperty; } } Both the service and the TableView share a reference to the observable list? Is this good practise in JavaFx and if not what is the correct strategy? If you hit the the 'Update' button the list will not always refresh to the ITEM_COUNT length. I believe this is because the observableList.clear() is interfering with the update which is running in the background thread. Can anyone shed some light on this?

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Determining if a coordinate is on a line

- by TGCBraun

I´m coding a little app that allows the user to draw multiple shapes and then remove or resize them. It´s working perfectly on rectangles and ovals, but I´m having issues with lines. Here´s a method that I wrote to find if the clicked spot on the screen is part of a specific line: public boolean containsLocation(int x, int y) { int m = (getY2() - getY()) / (getX2() - getX()); int b = getY() - (m * getX()); if (y == (m * x) + b) { return true; } return false; I´m using the famous y = mx + b formula and replacing y and x to find if the clicked spot is part of the line. The problem is when I click on the screen to remove the line, it only works if I click on the very fist coordinate (x,y) where the line starts. Nothing happens when I click anywhere else along the line. Can anyone shed a light on what I´m doing wrong? Thanks a lot.

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why datetime.now not work when I didn't use tolist?

- by MemoryLeak

When I use datacontext.News .Where(p => p.status == true) .Where(p => p.date <= DateTime.Now) .ToList(); the system will return no results; When I use datacontext.News .Where(p => p.status == true) .ToList() .Where(p => p.date <= DateTime.Now) .ToList(); system will return expected results. Can anyone tell me what's up? Thanks in advance !

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Passing array to function with pointer loses array size information!

- by Narek

If I write int main() { int a[100] = {1,2,3,4,}; cout<<sizeof(a)/sizeof(a[0])<<endl; return 0; } I get 400! If I write void func(int *a); int main() { int a[100] = {1,2,3,4,}; func(a); return 0; } void func(int *a) { cout<<sizeof(a)/sizeof(a[0])<<endl; } Then I get 400! So why passing array to function with pointer loses array size information?

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Showing an image after loading it from sql database

- by user330075

I have a problem showing the image form database in a view Details and a ImageController. Inside the view I have: img src=Url.Action("GetFile","Image", new {id= Model.id}) and in controller: public FileContentResult GetFile(int idl) { //int idl = 32; SqlDataReader rdr; byte[] fileContent = null; ........... return File(,,); } When the view is called, function GetFile it just won't work. But if I cut out the parameter int id1 and I instantiate it as a variable it does work. public FileContentResult GetFile() { int idl = 32; SqlDataReader rdr; byte[] fileContent = null; ........... return File(,,); } Why?

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Automatically decorating every instance method in a class

- by max

I want to apply the same decorator to every method in a given class, other than those that start and end with __. It seems to me it should be doable using a class decorator. Are there any pitfalls to be aware of? Ideally, I'd also like to be able to: disable this mechanism for some methods by marking them with a special decorator enable this mechanism for subclasses as well enable this mechanism even for methods that are added to this class in runtime [Note: I'm using Python 3.2, so I'm fine if this relies on features added recently.] Here's my attempt: _methods_to_skip = {} def apply(decorator): def apply_decorator(cls): for method_name, method in get_all_instance_methods(cls): if (cls, method) in _methods_to_skip: continue if method_name[:2] == `__` and method_name[-2:] == `__`: continue cls.method_name = decorator(method) return apply_decorator def dont_decorate(method): _methods_to_skip.add((get_class_from_method(method), method)) return method Here are things I have problems with: how to implement get_all_instance_methods function not sure if my cls.method_name = decorator(method) line is correct how to do the same to any methods added to a class in runtime how to apply this to subclasses how to implement get_class_from_method

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Passing ViewData to PartialView returned from using Html.Action

- by RWGodfrey

I want to embed a partial view in an ASP.NET MVC page by returning it from an action method. In my base view, I would have: <%= Html.Action("MyPartialViewAction") %> My controller would have an action method like: [ChildActionOnly] public ActionResult MyPartialViewAction() { return PartialView("MyPartialView"); } I expected the returned partial view (MyPartialView) to have access to the ViewData that was set in the base page's controller action but that doesn't appear to be the case. If I insert the partial view by using the following in my base view it works: <% Html.RenderPartial("MyPartialView") %> I don't want to do that though because I want my "MyPartialViewAction" to execute logic to determine WHICH partial view to return.

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Avoiding explicit recursion in Haskell

- by Travis Brown

The following simple function applies a given monadic function iteratively until it hits a Nothing, at which point it returns the last non-Nothing value. It does what I need, and I understand how it works. lastJustM :: (Monad m) => (a -> m (Maybe a)) -> a -> m a lastJustM g x = g x >>= maybe (return x) (lastJustM g) As part of my self-education in Haskell I'm trying to avoid explicit recursion (or at least understand how to) whenever I can. It seems like there should be a simple non-explicitly recursive solution in this case, but I'm having trouble figuring it out. I don't want something like a monadic version of takeWhile, since it could be expensive to collect all the pre-Nothing values, and I don't care about them anyway. I checked Hoogle for the signature and nothing shows up. The m (Maybe a) bit makes me think a monad transformer might be useful here, but I don't really have the intuitions I'd need to come up with the details (yet). It's probably either embarrassingly easy to do this or embarrassingly easy to see why it can't or shouldn't be done, but this wouldn't be the first time I've used self-embarrassment as a pedagogical strategy. Background: Here's a simplified working example for context: suppose we're interested in random walks in the unit square, but we only care about points of exit. We have the following step function: randomStep :: (Floating a, Ord a, Random a) => a -> (a, a) -> State StdGen (Maybe (a, a)) randomStep s (x, y) = do (a, gen') <- randomR (0, 2 * pi) <$> get put gen' let (x', y') = (x + s * cos a, y + s * sin a) if x' < 0 || x' > 1 || y' < 0 || y' > 1 then return Nothing else return $ Just (x', y') Something like evalState (lastJustM (randomStep 0.01) (0.5, 0.5)) <$> newStdGen will give us a new data point.

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stxxl Assertion `it != root_node_.end()' failed

- by Fabrizio Silvestri

I am receiving this assertion failed error when trying to insert an element in a stxxl map. The entire assertion error is the following: resCache: /usr/include/stxxl/bits/containers/btree/btree.h:470: std::pair , bool stxxl::btree::btree::insert(const value_type&) [with KeyType = e_my_key, DataType = unsigned int, CompareType = comp_type, unsigned int RawNodeSize = 16384u, unsigned int RawLeafSize = 131072u, PDAllocStrategy = stxxl::SR, stxxl::btree::btree::value_type = std::pair]: Assertion `it != root_node_.end()' failed. Aborted Any idea? Edit: Here's the code fragment void request_handler::handle_request(my_key& query, reply& rep) { c_++; strip(query.content); std::cout << "Received query " << query.content << " by thread " << boost::this_thread::get_id() << ". It is number " << c_ << "\n"; strcpy(element.first.content, query.content); element.second = c_; testcache_.insert(element); STXXL_MSG("Records in map: " << testcache_.size()); } Edit2 here's more details (I omit constants, e.g. MAX_QUERY_LEN) struct comp_type : std::binary_function<my_key, my_key, bool> { bool operator () (const my_key & a, const my_key & b) const { return strncmp(a.content, b.content, MAX_QUERY_LEN) < 0; } static my_key max_value() { return max_key; } static my_key min_value() { return min_key; } }; typedef stxxl::map<my_key, my_data, comp_type> cacheType; cacheType testcache_; request_handler::request_handler() :testcache_(NODE_CACHE_SIZE, LEAF_CACHE_SIZE) { c_ = 0; memset(max_key.content, (std::numeric_limits<unsigned char>::max)(), MAX_QUERY_LEN); memset(min_key.content, (std::numeric_limits<unsigned char>::min)(), MAX_QUERY_LEN); testcache_.enable_prefetching(); STXXL_MSG("Records in map: " << testcache_.size()); }

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