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• Would a pointer to a pointer to nil match against NULL?

  - by dontWatchMyProfile

  Example: A validation method contains this check to see if an NSError object shall be created or not: - (BOOL)validateCompanyName:(NSString *)newName error:(NSError **)outError { if (outError != NULL) { // do it... Now I pass an NSError object, like this: NSError *error = nil; BOOL ok = [self validateCompanyName:@"Apple" error:&error]; I'm not sure if this matches the check for not NULL. I think it's not NULL, since I believe NULL is not nil. Maybe someone can clear this up?

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• problem in deleting record

  - by akshay

  I have a entity manager em1 .em1 starts a transcation tx on db1 table1.Now inside tx i call a API getdata().This API creastes a new entitymanger em2 and return 1 record.Now if entity manger em1 tries to delete the record returned by em1 , it hangs.Code times out.Is the record locked by em1.How can ii solve this problem? create em1 //em1 start transcation tx1 tx1.start Object r = getData(); em1 tried to delete r //code hangs here tx1.commit Object getData(){ create em2 return data found using em2 }

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• How to write native SQL queries in Hibernate without hardcoding table names and fields?

  - by serg555

  Sometimes you have to write some of your queries in native SQL rather than hibernate HQL. Is there a nice way to avoid hardcoding table names and fields and get this data from existing mapping? For example instead of: String sql = "select user_name from tbl_user where user_id = :id"; something like: String sql = "select " + Hibernate.getFieldName("user.name") + " from " + Hibernate.getTableName(User.class) + " where " + Hibernate.getFieldName("user.id") + " = :id";

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• How do I generate Entity Framework 4.0 classes from the command line that have different names than

  - by Josh Kodroff

  I want to generate Entity Framework 4.0 classes from a (legacy) database from a command line, but I have 2 transformations I want: Tables/columns are lowerCamelCase and I want my classes/members to be UpperCamelCase. I want to suffix my classes with "Dto". Any idea how this might be accomplished? I'm a total newbie to EF, but I have a decent understanding of Linq to Sql and was able to accomplish the same task by doing: sqlmetal - dbml - xml mapping file and .cs file.

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• Converting a string into a CheckBox

  - by Chris

  I have a string which is ultimately the id of a CheckBox. What I need to be able to do is to access the CheckBox's properties from the string var myCheckBox:Object; var myString:String; myString = "checkbox_1" myCheckBox = Object(myString); ?!?! ... and then I'd need to get to myCheckBox.selected, and myCheckBox.label etc

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• Is there any way to do this without using '__init__'?

  - by zjm1126

  class a(object): c=b()# how to call the b method d=4 def __init__(self): print self.c def b(self): return self.d+1 a() how to call the 'b' method not in the __init__ thanks the error is : Traceback (most recent call last): File "D:\zjm_code\a.py", line 12, in <module> class a(object): File "D:\zjm_code\a.py", line 13, in a c=b()# how to call the b method NameError: name 'b' is not defined

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• iPhone Quartz - Open GL

  - by user345473

  Hi all, Does anyone have an idea what do the mind mapping applications use for drawing: Quartz 2D or Open GL? What would be the best way to implement this kind of application? Any advice is welcomed! Thanks!

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• Moving from php to rails

  - by piemesons

  While moving from php to rails (Means procedural language to Object oriented language), what are the various things you should keep in mind. How to think in world of object oriented programming? What are thinks i should kept in mind before starting the things. Any tips?

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• list box asp.net selected problem

  - by lodun

  .When i choose item from "kategorije" new items loads to me in SUB_kategorije, but when i choose item from SUB_kategorije and when i click on button it shows me this error: Object reference not set to an instance of an object. Line 101: kom.Parameters.Add("@podkategorija", SqlDbType.Text).Value = SUB_kategorije.SelectedItem.ToString(); This is my source... dod_pit.ascx dod_pit.ascx.cs

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• How do i make a picturebox selectable?

  - by acidzombie24

  I am making a very basic map editor. I'm halfway through it and one problem i hit is how to delete an object. I would like to press delete but there appears to be no keydown event for pictureboxes and it will seem like i will have it only on my listbox. What is the best solution for deleting an object in my editor?

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• String case changes

  - by gozali

  Is there any String manipulation function in Javascript or JQuery for object lowercasing / uppercasing? I need to lowercase a string object.

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• best scala idiom for find & return

  - by IttayD

  This is something I encounter frequently, but I don't know the elegant way of doing. I have a collection of Foo objects. Foo has a method bar() that may return null or a Bar object. I want to scan the collection, calling each object's bar() method and stop on the first one returning an actual reference and return that reference from the scan. Obviously: foos.find(_.bar != null).bar does the trick, but calls #bar twice.

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• Hibernate violation error

  - by sarah

  Hi All, I am having a designation table with d_name as primary key which i am using in user table as foreign key reference .I am using hbm for mapping in designation hbm i have id defined as d_name mapped to database column .I am getting a error saying "integrity constraint violation(user_designation_fk) parent key not found. " Where am i going wrong /this error is coming while i am tring to add a user selecting a designation reading from designation table.

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• What's the Correct name for a Association table (many to many relationship)

  - by Imran

  What's the Correct or most popular name for a Association table? I've heard Lookup,associative,resolving,mapping and junction table so far? Thank you in advance;-)

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• copy code from one file to other file in c#

  - by gou

  Using Below Code, We Can Copy Code from One textbox to other textbox. private void Copybtn_Click(object sender, EventArgs e) { Clipboard.SetText(txtSour.Text); } //paste the text private void Pastebtn_Click(object sender, EventArgs e) { txtDestinatio.Text = Clipboard.GetText(); } My Requirement is: Copy Code from one file to other file using C#? Is It possible using ClipBoard? Then i need to copy code from one file to other? Please AnyOne Help me

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• Serializing data from a RSS feed in ASP.NET

  - by DotnetDude

  I'd like the user to specify a RSS feed address and serialize the information from it. I am not interested in the XML format, but populate a strongly typed object from the XML. My question is, is there a standard that all RSS feeds support (Do all of them have date, title etc)? If so, is there a XSD that describes this. If not, how do I handle serializing a RSS feed to an object in ASP.NET?

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• Grails views for subclasses

  - by Jeff Beck

  I have a domain object called page that only has a title, I then have subclasses what are StaticPage that also has a textblock and PicturePage that contains a url. I have a site object that has many pages, I am looking for a way in the view for the site to call the a different template for each subclass. I can easily iterate through the pages but I would like to call each subclasses own view.

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• Interview question: about Java serialization and singletons

  - by subhashis

  In an interview the interviewer asked me the following question: is it possible to serialize a singleton object? I said yes, but in which scenario should we serialize a singleton? And is it possible to design a class whose object can not be serialized?

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• LINQ: transform an array [,] into array[]

  - by code4life

  I know this is kind of a dumb question, but does anyone have an elegant (or non-elegant) LINQ approach to transform a 2D array (object[,]) into a 1D array (object[]) comprised of the first dimension of the 2D array?

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• Reduce Triangle in DirectX 9

  - by Himadri

  Hello everyone, I have a 3D object with about 2000 or 3000 triangles. I want to reduce the number of triangle without affecting shape of object. for eg, I have two triangles, (1,1.5,2) (1.5,1.5,2) (1.7,2,2) (1.5,1.5,2) (1.7,2,2) (2,1.5,2) In this case these two triangle is same as a single triangle - (1,1.5,2) (2,1.5,2) (1.7,2,2) I dont want the manual method, But if there is any direct function or such thing which will reduce my triangle list. Thank You.

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• When is it necessary to override Equals() in a .NET class?

  - by Alex Angas

  .NET contains its own equality comparison functionality, however I don't really understand how it works. If the desired Equals() and == behaviour is to verify that every field of an object is equal to every field of another object, is it necessary to override Equals() with a method that does this explicitly?

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• Accessing a numeric property in a SimpleXMLElement

  - by Webnet

  I'm trying to access the number in the below element, but I'm having trouble getting the value out of it. echo $object->0; //returns Parse error: syntax error, unexpected T_LNUMBER, expecting T_STRING or T_VARIABLE or '{' or '$' SimpleXMLElement Object ( [0:public] => 15810 ) Any ideas on how I can get that value?

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• Determining whether jQuery doesn't find any element

  - by Bardock

  Hi, I'm using jQuery's selectors, especially id selector: $("#elementId")... How should I determine whether jQuery has found the element or not? Even If the element with the specified id doesn't exist the next statement give me: [object Object] alert($("#idThatDoesnotexist"));

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• What's -mutableSetValueForKey: returning, actually? Is that something special?

  - by dontWatchMyProfile

  From the docs: You usually access to-many relationships using mutableSetValueForKey:, which returns a proxy object that both mutates the relationship and sends appropriate key-value observing notifications for you. So this returns an "intelligent" NSMutableSet which automatically lets the context delete objects when they get deleted from the set, and reverse? Is that a proxy object?

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• how to put link as an additional column in display tag to redirect it to action class of struts2

  - by lakhaman

  i am displaying a object detail through display tag. now i want a link in page through which user can delete or edit that particular record so i want a link which has object id as value and pass it to action class. or any other way so that i can delete or edit perticular record thank in advance

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