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Search found 53294 results on 2132 pages for 'null pointers etc'.

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• Using a ControlParameter in FilterParameters when the property is null

  - by end-user

  I have a DataList and FormView; they have separate datasources, though they pull the same info. The FormView's datasource has a FilterExpression to pull whatever's been selected on the DataList. On first load, the SelectedValue of the DataList is null (naturally). I expect the FilterExpression to result in zero rows, but it doesn't. If I set…

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• How to check for undefined or null variable in javascript

  - by Thomas Wanner

  We are frequently using the following code pattern in our javascript code if(typeof(some_variable) != 'undefined' && some_variable != null) { // do something with some_variable } and I'm wondering whether there is a less verbose way of checking that has the same effect. According to some forums and literature saying simply …

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• Value cannot be null in sportstore exampe

  - by Naim

  Hi everyone, I am having this problem when I want to implement IoC for sportstore example. The code public WindsorControllerFactory(){ container = new WindsorContainer( new XmlInterpreter(new ConfigResource("castle")) ); var controllerTypes= from t in Assembly.GetExecutingAssembly().GetTypes() …

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• EXCEL import to sql returning NULL for decimals when in VARCHAR data type

  - by Daniel

  Hi, I am working on a peice of software which has expodentially grown over the last few years and the database needs to be regularly updated. Customers are providing us with data now on large spreadsheets which we format and will start importing into the database. I am using the Import and Export Data (32-bit) Wizard. One column in the…

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• Casting an object which could be null

  - by DeeMac

  DateTime? testDate = (DateTime?)arrayOfObjects[dateObject]; Does that code look ok? I attempted to use the as operator but I got the 'non-nullable' error. What I'm trying to say is that the object I'm choosing from the array is either DateTime or a null DateTime but either can be assigned to testDate. Doesn't feel right doing it this…

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• Return Empty String as NULL

  - by Daniel

  I have a listbox select and I want when the user selects null for the empty string it produces to pull the nulls from the SQL table. Here's what I have now. Blank strings return nothing because there are no empty fields in the table. SELECT * FROM dbo.Table WHERE ID = " & TextBox2.Text & " and And Field1 IN (" & Msg1 &…

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• Why Garbage Collection if smart pointers are there

  - by Gulshan

  This days, so many languages are garbage collected. Even it is available for C++ by third parties. But, C++ has RAII and smart pointers. So, what's the point of using garbage collection? Is it doing something extra? And in other languages like C#, if all the references are treated as smart pointers(keeping RAII aside), by specification…

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• using GNU GPL v2 software as pointers to solution to problem

  - by Patrick

  I am coding a PHP serial access class and have been taking pointers from the PHP-serial class on Google Code (here). That class is based on PHP 4 and I'm creating a PHP 5 class that allows more functionality and is specific to some business demands I have. There is no code copied and I have done all the coding. Does the class I'm…

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• Comparing two date ranges within the same table

  - by Danny Herran

  I have a table with sales per store as follows: SQL> select * from sales; ID ID_STORE DATE TOTAL ---------- -------- ---------- -------------------------------------------------- 1 1 2010-01-01 500.00 2 1 2010-01-02 185.00 3 1 2010-01-03 135.00 4 …

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• Calling a method on an unitialized object (null pointer)

  - by Florin

  What is the normal behavior in Objective-C if you call a method on an object (pointer) that is nil (maybe because someone forgot to initialize it)? Shouldn't it generate some kind of an error (segmentation fault, null pointer exception...)? If this is normal behavior, is there a way of changing this behavior (by configuring the…

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• Passing NULL value

  - by FFXIII

  Hi. I use an instance of NSXMLParser. I store found chars in NSMutableStrings that are stored in an NSMutableDictionary and these Dicts are then added to an NSMutableArray. When I test this everything seems normal: I count 1 array, x dictionnaries and x strings. In a detailview controller file I want to show my parsed…

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• Get the parent class of a null object (C# Reflection)

  - by Nick

  How would I get the parent class of an object that has a value of null? For example... 'Class A' contains 'int? i' which is not set to any value when the class is created. Then in some other place in the code I want to pass in 'i' as a parameter to some function. Using 'i' as the only info, I want to be able to…

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• What are the disadvantages of self-encapsulation?

  - by Dave Jarvis

  Background Tony Hoare's billion dollar mistake was the invention of null. Subsequently, a lot of code has become riddled with null pointer exceptions (segfaults) when software developers try to use (dereference) uninitialized variables. In 1989, Wirfs-Brock and Wikerson wrote: Direct references to variables…

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• ASP.Net repeater item.DataItem is null

  - by mattgcon

  Within a webpage, upon loading, I fill a dataset with two table with a relation between those tables and then load the data into a repeater with a nested repeater. This can also occur after the user clicks on a button. The data gets loaded from a SQL database and the repeater datasource is set to the dataset…

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• How to create a container that holds different types of function pointers in C++?

  - by Alex

  I'm doing a linear genetic programming project, where programs are bred and evolved by means of natural evolution mechanisms. Their "DNA" is basically a container (I've used arrays and vectors successfully) which contain function pointers to a set of functions available. Now, for simple problems, such as…

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• C# ?? null coalescing operator

  - by anirudha

  the null coalescing operator is used for set the value when object is null. if object have some value that nothing change and still have their default value they have.  string str = "i am string";            string message = str ?? "it is null";…

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• How to simulate inner join on very large files in java (without running out of memory)

  - by Constantin

  I am trying to simulate SQL joins using java and very large text files (INNER, RIGHT OUTER and LEFT OUTER). The files have already been sorted using an external sort routine. The issue I have is I am trying to find the most efficient way to deal with the INNER join part of the algorithm. Right now I am…

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• LINQ + Find count of non-null values

  - by Ashutosh

  I have a table with the below structure. ID VALUE 1 3.2 2 NULL 4 NULL 5 NULL 7 NULL 10 1.8 11 NULL 12 3.2 15 4.7 17 NULL 22…

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• Make Your Mouse Pointers Left-hand Friendly

  - by Matthew Guay

  It’s a right-centric world, with everything from pencils to computer mice expecting you to be right-handed.  Here’s how you can train your mouse and cursors in Windows 7 and Vista to respect your left-handedness. Using your Left Hand the Right Way It’s easy to switch your mouse to left-handed…

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• Grep / RegExp help

  - by Calvin

  Hi everyone! I apologize if this is a really stupid question. I have data in the format: etc etc etc <span>etc etc etc</span> etc etc etc etc etc etc <span>etc etc etc</span> etc etc etc etc etc etc <span>etc etc etc</span> etc etc etc Is there a way to grep…

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• JME: How to get the complete screen in WHITE without buttons, etc etc

  - by Sepala

  Please have a look at the following code /* * To change this template, choose Tools | Templates * and open the template in the editor. */ import javax.microedition.midlet.*; import javax.microedition.lcdui.*; /** */ public class Midlet extends MIDlet{ private Form f; private…

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• LINQ query null reference exception

  - by user289082

  Hi! I have the next query: var bPermisos = from b in ruc.Permisos where b.IdUsuario == cu.Id select new Permisos(){ Id=b.Id, …

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• What is wrong with this null check for data reader

  - by Phil

  c.Open() r = x.ExecuteReader If Not r("filename").IsDbnull Then imagepath = "<img src='images/'" & getimage(r("filename")) & " border='0' align='absmiddle'" End If c.Close() r.Close() I have…

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• Groovy conpiler give the output as null null

  - by Bunny Rabbit

  while compiling a groovy class the conpiler gives me an output nullnull? what does that mean ?i am left puzzled.

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• What is null exactly in java?

  - by Brodie

  is it a special value? or is it a special memory address? what is it exactly?

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