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• Why can one null return be tested but another throws an exception?

  - by mickey

  I want to test if an xml attribute is present. Given this: XmlAttributeCollection PG_attrColl = SomeNodeorAnother.Attributes; This first test works: if (null != PG_attrColl["SomeAttribute"]) "GetNamedItem" is supposed to return null, but the following test throws an exception complaining about the null it returns. if (null != PG_attrColl.GetNamedItem("SomeAttribute").Value;) Why the difference? Just curious.

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• When to retain a "delegate"

  - by Jose

  I know that in Objective-C you should never retain your delegates because it may cause a retain-cycle, however, how do you know the difference between a delegate and a non-delegate object ? Can't it be said that just sending a message to any object is delegating work to that object ?

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• Comparing two text files in python

  - by tazim

  Hi, I need to compare two files and redirect the different lines to third file. I know using diff command i can get the difference . But, is there any way of doing it in python ? Any sample code will be helpful

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• Objective C: Compare timeInMillis with current time

  - by Srivathsan Canchi

  Hello, In my iPhone application, I need to calculate the time difference between the time a message was created on the server, and the time my phone received it. The server (Java) puts in a number returned by System.currentTimeMillis() as metadata along with the message. How do I compare this number with the current time on the device? Could not find a suitable NSDate method to do this comparison. Thanks in advance!

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• GNU Emacs is crashing with -nw

  - by Jack

  When I run emacs with -nw option, the emacs really open, but I can't do more nothing. As if the user input is blocked and no keyboard signal is received and/or interpreted. I've tried run without load .emacs file and some other behaviors: emacs -nw -Q --no-desktop --debug-ini foo.c But makes no difference and strangely the GUI-version(using Gtk) is working fine. My gnu-emacs version is GNU Emacs 23.3.1 Any help to help to fix it is very appreciated.

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• Confused about type conversion in C++

  - by Venkats

  In C++, the following lines have me confused: int temp = (int)(0×00); int temp = (0×00int); What is the difference between those 2 lines?

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• What are the benefits of using properties internally?

  - by cyclotis04

  Encapsulation is obviously helpful and essential when accessing members from outside the class, but when referring to class variables internally, is it better to call their private members, or use their getters? If your getter simply returns the variable, is there any performance difference?

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• Magento Installment Payments?

  - by Jason

  Is it possible to have a payment option to pay in X installments in Magento? We will be using Moneris as our payment gateway to process cards if that makes any difference. thanks

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• How to implement pure virtual function in C++

  - by skydoor

  Hi, I think the implementation of virtual function is talked about a lot. My question is what about pure virtual function? However it is implemented? In virtual table, how to tell it is a pure or non-pure? What the difference between pure virtual function and virtual function with implementation?

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• speed of map() vs. list comprehension vs. numpy vectorized function in python

  - by mcstrother

  I have a function foo(i) that takes an integer and takes a significant amount of time to execute. Will there be a significant performance difference between any of the following ways of initializing 'a': a = [foo(i) for i in xrange(100)] , a = map(foo, range(100)) , and vfoo = numpy.vectorize(foo) vfoo(range(100)) ? (I don't care whether the output is a list or a numpy array). Is there some other better way of doing this? Thanks.

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• I am working with Visual Studio 2008. Actually there is References folder missing

  - by Azhar

  I am working with Visual Studio 2008. Actually there is References folder missing in its solution explorer. When I create a New web Application it has References folder but when I add new .aspx file it also adds .aspx.designer.cs file with it and its does not show master page option in add dialogue. but in the old web application it shows the master page option where master page file is already added. whats the difference between these two solutions.

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• Why would you need a slash at the end of a URL?

  - by Daniel

  Is there a difference between these URLs in regards to having slashes at the end of the URL? https://drchrono.com/about_us https://drchrono.com/about_us/ Do web frameworks and web servers (e.g. Apache, Nginx, Django) handle these requests differently?

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• Why are Ruby projects so dominant at Github?

  - by timepilot

  Ruby is the most popular language at Github by far. Compare that with the questions at Stack Overflow or the TIOBE index. What is the reason for this difference in relative popularity in different places?

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• jquery document height reported incorrectly by IE (on XP) first time

  - by Zhami

  I'm having a "first time" problem with IE, which reports a different value for $(document).height(); when the page first loads versus subsequent queries. The difference is 17 pixels regardless of the opening size of the window -- on document ready, the height reported is 17 pixels larger than is subsequently reported. I wonder if this is an artifact of some aspect of my page (some margins or paddings somewhere), but so far can't account for 17 pixels.

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• Comment Starting with /*!

  - by Phonethics

  My editor (geany) changes the comment colour when the comments starts with /*! Whats the difference between /* ... */ and /*! ... */

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• ruby or python more suitable for scripting in all OSes?

  - by fayer

  if i want to script a mini-application (in the Terminal) in mac and windows, which one is preferred: ruby or python? or is there no major difference just a matter of taste? cause i know python definetely is a good scripting language. thanks

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• How to insert time in SQl Derver 2005?

  - by sam

  i am creating windows application .In this i have to subtract two dates .i subtract it successfully ,i used TimeSpan to get subtracted value.But when i insert it in SQl Server 2005 db, it inserted with starting date i.e. 1/1/1900 and the calculated difference which format should i use to insert Time only? Thanks in advance

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• Compare two times without regard to Date associated - Ruby

  - by H55nick

  I am trying to find the difference in time (without days/years/months) of two different days. Example: #ruby >1.9 time1 = Time.now - 1.day time2 = Time.now #code to make changes #test: time1 == time2 # TRUE My solution: time1 = time1.strftime("%h:%m").to_time time2 = time2.strftime("%h:%m").to_time #test time1 == time2 #True #passes I was wondering if there was a better way of doing this? Maybe we could keep the Date the same as time1/time2?

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• __proto__ of a function

  - by alter

  if I have a class called Person. var Person = function(fname, lname){ this.fname = fname; this.lname = lname; } Person.prototype.mname = "Test"; var p = new Person('Alice','Bob'); Now, p.proto refers to prototype of Person but, when I try to do Person.proto , it points to function(), and Person.constructor points to Function(). can some1 explain what is the difference between function() and Function() and why prototype of a Function() class is a function()

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• Shortcut key to restart server in Eclipse

  - by weesilmania

  So Ctrl/Cmd-F11 starts the server, but is there a key to restart the server? I'm developing using app engine and GWT if that makes any difference (I suspect not).

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• string or nsstring with string

  - by joels

  Lets assume myProp is @property (retain) NSString * myProp and synthesized for us.... self.myProp = @"some value";//string literal? self.myProp = [NSString stringWithString:@"some value"]; Is there a difference here? Is the first one a string literal that doesnt get autoreleased or is it just in memory for it's current scope and I dont have to worry about it?

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• Qt releasing memory occopied by unneeded images

  - by Gerhman

  I have a QML Flickable with 3 QML image elements that cycle through 8 image files. My problem is for each new image it loads into memory it does not release the the unused image. This is causing memory usage to become double what is necessary at times. I would like to know if there is some function I can use to force it to unload all the unused images? If it makes a difference, this is mainly for Symbian.

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• MailMessage Question/Confusion

  - by j-t-s

  Using this: MailMessage mm = new MailMessage(); What is the difference between: mm.Sender = sender; and mm.From = from; ? Thank you

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• How to make liquid layout in css using em?

  - by Rajasekar

  Does using em as css unit solve the problem in difference in monitor resolution (800x600 vs. 1024x768)?

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• Update one list from another

  - by lacqui

  I have two multi-select lists in HTML - one of categories, and another of items. What I want is that, when an item selected in the "category" list, everything in the "items" list from that category is also selected. For example, if "Categories" contains "Animal", "Mineral", and "Vegetable", and "Items" contains "Dog", "Cat", "Monkey", "Diamond", "Granite", "Carrot", "Tomato": If "Animal" is selected in one list, "Dog", "Cat", and "Monkey" should be selected; any other selections should remain as they are. I'm using a Symfony PHP backend on the server, if that makes any difference

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