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• Whats the difference between new Foo; and new Foo();

  - by uberjumper

  Can someone please explain what is the different between calling new like: foo = new QtWidget(); I noticed alot of Qt's examples do this: foo = new QtWidget; I tried to Google this but didn't come up with anything.

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• [iPhone] Does anyone experiencing freezing duing app launching or closing?

  - by Peter SHINe ???

  App freezes, and the device freezes sometime during launching or closing. This happens especially to the app developed and installed using Xcode. Can anyone explain what's going on, if it's iOS 4 Gold Beta specific issue, or a generic task must be handled by a developer?

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• Understanding max JVM heap size

  - by Marcus

  I've read the max heap size on 32bit Windows is ~1.5GB which is due to the fact that the JVM requires contiguous memory. Can someone explain the concept of "contiguous memory" and why you only have max 1.5GB on Windows? Secondly, what then is the max heap size on 64 bit Windows and why is this different than what's available on 32 bit?

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• Oracle : Identifying duplicates in a table without index

  - by user288031

  When I try to create a unique index on a large table, I get a unique contraint error. The unique index in this case is a composite key of 4 columns. Is there an efficient way to identify the duplicates other than : select col1, col2, col3, col4, count() from Table1 group by col1, col2, col3, col4 having count() 1 The explain plan above shows full table scan with extremely high cost, and just want to find if there is another way. Thanks !

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• Do you disable SELinux?

  - by manicmethod

  I want to know if people here typically disable SELinux on installations where it is on by default? If so can you explain why, what kind of system it was, etc? I'd like to get as many opinions on this as possible.

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• WCF Dataservices and OData

  - by rkrauter

  Could someone please explain the difference? From what I understand, I could expose my data directly using WCF data services or expose it using OData. http://msdn.microsoft.com/en-us/data/aa937697.aspx

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• warcraft3 packet infromation [closed]

  - by ajay009ajay

  Hello All, I have made a program which is fetching data from server to and game to server. I want to keep these record in my file. But my problem is this is not in good format that i can read easily. I am reading all data as "Byte" (from java). Can anybody explain header or data info of packet. so I can read it in human manner Huh thanks.

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• zip -j command, what does the -j option mean?

  - by Simon Guo

  Wondering what is the -j option mean in the zip command. I found the explanation as following: -j Store just the name of a saved file (junk the path), and do not store directory names. By default, zip will store the full path (relative to the current path). But not quite sure what it is exact mean? Can anyone explain it using the following command as an example? C:\programs\zip -j myzipfile file1 file2 file3 Thank you.

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• android Traceviewer

  - by siri

  Hi I am Trying to use trace viewer by Debug.startMethodTracing("sampletrace"); Debug.stopMethodTracing(); And I pull the sampletrace to a folder from sdcard. When I try view the tracefile using the following command. D:\Android\android-sdk-windows\toolstraceview D:\trace\sampletrace.trace it is showing the following line Key section does not have an *end marker Can anybody please explain what is this?

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• Internet basic concepts

  - by MB

  Hi, for school im writing an introduction to internet concepts, what should be the first thing to explain? Maybe client-server relation, TCP/IP protocol or something else?

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• Moq Callback can you help to understand it.

  - by devnet247

  Hi Using moq and looked at callback but I have not been able to find a simple example to understand how to use it. Do you have a small working snippet which clearly explain how and when to use it? Thanks a lot

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• client-side and the server-side based on the silverlight

  - by Malcolm

  Do the .xaml file and its .cs gets run on server-side or client-side. It will be nice if anyone can explain on this the client-side and the server-side based on the silverlight. Thanks in advance.

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• Korn Shell SegFault

  - by C. Ross

  I have found the following script causes a segmentation fault and core in kshell on AIX. Can anyone explain why I get the following results? Seg Fault doOutput(){ Echo "Something" } doOutput() >&1 OR doOutput(){ Echo "Something" } echo `doOutput()` No Output doOutput(){ Echo "Something" } doOutput() Correct doOutput(){ Echo "Something" } doOutput OR doOutput(){ Echo "Something" } doOutput >&1

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• Hide multiple PictureBox except clicked

  - by gadirzade

  HI Let me explain what i wont to do.I have a form and there is 10 picturebox on it.when I click one of them I wont to hide all other except clicked.It is possible that on click event of all of them hide others.but I ask for efficent way.forexample with a single function call from click event maybe

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• How do i make a multi-threaded server in perl?

  - by David

  I have looked online at making a multi-threaded server in perl, but i cannot find any good ones that clearly explain how to create one. I have created a server and client in perl but i do not seem to be able to make it multi-threaded. Can someone help me?

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• What are classes and modules for in C#

  - by Arlen Beiler

  Can someone explain the difference between a class and a module. When do you use one versus the other? I am using C#. Update: I do mean the C# equivalent of the VB Module.

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• Basic tutorial for multithreading

  - by Russel

  Hi, I'm a coding newbie, but I really wanna learn how to do multithreading and event handling. Does anyone know of any good tutorials out there, or can they explain it to me in a nutshell?

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• What is difference between @Resource UserTransaction and EntityManager.getTransaction()

  - by Nitesh Panchal

  Hello, Can anybody explain what is difference between :- @Resource UserTransaction objUserTransaction; and EntityManager.getTransaction(); And also what is container managed transaction? and how should i do it in my session facade if i want to insert three rows in table in transaction.

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• PostgreSQL: Why does this simple query not use the index?

  - by David

  I have a table t with a column c, which is an int and has a btree index on it. Why does the following query not utilize this index? explain select c from t group by c; The result I get is: HashAggregate (cost=1005817.55..1005817.71 rows=16 width=4) -> Seq Scan on t (cost=0.00..946059.84 rows=23903084 width=4) My understanding of indexes is limited, but I thought such queries were the purpose of indexes.

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• Using SVN in Windows (Wordpress plugin-repository)?

  - by Martti Laine

  Hello I just got approved to Wordpress' plugin-repository. Howvere, they gave me access, but I have no idea about how to use it. Could someone explain me patiently, how can I use this repository to post my plugin? I'm using Windows. Martti laine

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• Effect of 'myObj = [[[[MyClass alloc] init] autorelease] retain];'?

  - by filipe

  I've just downloaded the Facebook iOS SDK and I noticed that in the sample code that comes with the SDK whenever it creates an instance of the Facebook class it does it like this: _facebook = [[[[Facebook alloc] init] autorelease] retain]; where _facebook is a member variable of the calling object (i.e. not a local variable). Can anyone explain exactly what's the point of autoreleasing and then retaining it?

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• What cultures are supported by the CultureInfo class in .NET 3.5?

  - by Fiona Holder

  I need a list of cultures that are supported by .NET 3.5, regardless of the OS used. This seems to be quite a struggle to obtain, though I am not sure why! Edit: Arghh, I was not aware that it is dependent on the OS, that would explain the lack of documentation. Any ideas on what is supported by Mac/Linux OS as well? Thanks :)

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• Bizarre WHERE col = NULL behavior

  - by Kenneth

  This is a problem one of our developers brought to me. He stumbled across an old stored procedure which used 'WHERE col = NULL' several times. When the stored procedure is executed it returns data. If the query inside the stored procedure is executed manually it will not return data unless the 'WHERE col = NULL' references are changed to 'WHERE col IS NULL'. Can anyone explain this behavior?

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• mysql query optimization

  - by vamsivanka

  I would need some help on how to optimize the query. select * from transaction where id < 7500001 order by id desc limit 16 when i do an explain plan on this - the type is "range" and rows is "7500000" According to the some online reference's this is explained as, it took the query 7,500,000 rows to scan and get the data. Is there any way i can optimize so it uses less rows to scan and get the data. Also, id is the primary key column.

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• Visual Studio appears to randomly adopt american keyboard layout

  - by HollyStyles

  Gah! this is really causing me hassle today. Suddenly without warning '@' (at symbol) and '"' (double quote) are trading places on my keyboard but ONLY in Visual Studio 2008 !!! I can't seem to find anything in help or online to explain/remedy this. Is there some keyboard shortcut I am inadvertantly executing?? I rebooted my PC and it went away for an hour or two and then suddenly came back. Oh the insanity :(

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