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• Implications of Fulltext Search over many columns

  - by Alex

  Hello, I have a really wide table which includes separate columns for billing address, shipping address, primary address, names, aliases etc. (I can't normalize this table further, and that's not the question here anyways). I'm implementing SQL Server fulltext search, and I'm wondering whether I should limit the search ability to just the primary fields (primary address and names for example), or if I can extend the search ability across all columns without occurring too much of a performance or memory penalty. I've done some basic testing with 10,000 sample rows and it's quite fast but I don't have much experience with fulltext indexing, especially its dictionary internals, so I don't know if the index is going to grow over time, or if there is anything else to consider. Thoughts?

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• Can't inherit from auto_ptr without problems

  - by fret

  What I want to do is this: #include <memory> class autostr : public std::auto_ptr<char> { public: autostr(char *a) : std::auto_ptr<char>(a) {} autostr(autostr &a) : std::auto_ptr<char>(a) {} // define a bunch of string utils here... }; autostr test(char a) { return autostr(new char(a)); } void main(int args, char **arg) { autostr asd = test('b'); return 0; } (I actually have a copy of the auto_ptr class that handles arrays as well, but the same error applies to the stl one) The compile error using GCC 4.3.0 is: main.cpp:152: error: no matching function for call to `autostr::autostr(autostr)' main.cpp:147: note: candidates are: autostr::autostr(autostr&) main.cpp:146: note: autostr::autostr(char*) I don't understand why it's not matching the autostr argument as a valid parameter to autostr(autostr&).

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• android java.lang.OutOfMemoryError

  - by xiangdream

  hi, all, when i download large data from website, i got this error information: I/global (20094): Default buffer size used in BufferedInputStream constructor. It would be better to be explicit if an 8k buffer is required. D/dalvikvm(20094): GC freed 6153 objects / 3650840 bytes in 335ms I/dalvikvm-heap(20094): Forcing collection of SoftReferences for 3599051-byte al location D/dalvikvm(20094): GC freed 320 objects / 11400 bytes in 144ms E/dalvikvm-heap(20094): Out of memory on a 3599051-byte allocation. I/dalvikvm(20094): "Thread-9" prio=5 tid=17 RUNNABLE I/dalvikvm(20094): | group="main" sCount=0 dsCount=0 s=0 obj=0x439b9480 I/dalvikvm(20094): | sysTid=25762 nice=0 sched=0/0 handle=4065496 anyone can help me?

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• In C, as free() knows an array size, why isn't there a function that gets the array size? [closed]

  - by user354959

  Possible Duplicate: If free() knows the length of my array, why can’t I ask for it in my own code? Searching around (including here at stackoverflow), I got that malloc() allocates an array and also creates a header to control the array info. In this header, there's also the array size. free() use such information to know how to deallocate that array. So, if the array size info is "there" (somewhere in the memory), why there isn't a function that returns an array size, looking for this at the array header? Or am I missing something?

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• Is there any significant benefit to reading string directly from control instead of moving it into a

  - by Kevin

  sqlInsertFrame.Parameters.AddWithValue("@UserName", txtUserName.txt); Given the code above...if I don't have any need to move the textbox data into a string variable, is it best to read the data directly from the control? In terms of performance, it would seem smartest to not create any unnecessary variables which use up memory if its not needed. Or is this a situation where its technically true but doesn't yield any real world results due to the size of the data in question. Forgive me, I know this is a very basic question.

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• C++ initializing constants and inheritance

  - by pingvinus

  I want to initialize constant in child-class, instead of base class. And use it to get rid of dynamic memory allocation (I know array sizes already, and there will be a few child-classes with different constants). So I try: class A { public: const int x; A() : x(0) {} A(int x) : x(x) {} void f() { double y[this->x]; } }; class B : A { B() : A(2) {} }; Pretty simple, but compiler says: error C2057: expected constant expression How can I say to compiler, that it is really a constant?

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• RSS-Feed or XML-Stream?

  - by Maenny

  HI Folks, I am programming a website for online-reservation-management, preferably for holiday homes. I want to implement a service, which allows the user to pass all their occupation dates to other websites. My question is, what would be the most professional way to do this? Generate a XML-stream Create a valid RSS Feed I think that a XML file has the advantages of being straight to the point, without any information that noone needs. Webmasters of other websites surely prefer the structure of a simple XML file. On the other hand, when someone without programming knowledge wants to use the RSS-Feed with a feedreader or simply with the browser, it may be user-friendlier to use a RSS-FEED. What so you think, I'm unsure...? Greetz Maenny

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• Remove from a std::set<shared_ptr<T>> by T*

  - by Autopulated

  I have a set of shared pointers: std::set<boost::shared_ptr<T>> set; And a pointer: T* p; I would like to efficiently remove the element of set equal to p, but I can't do this with any of the members of set, or any of the standard algorithms, since T* is a completely different type to boost::shared_ptr<T>. A few approaches I can think of are: somehow constructing a new shared_ptr from the pointer that won't take ownership of the pointed to memory (ideal solution, but I can't see how to do this) wrapping / re-implementing shared_ptr so that I can do the above just doing my own binary search over the set Help!

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• C++ program runs slow in VS2008

  - by Nima

  I have a program written in C++, that opens a binary file(test.bin), reads it object by object, and puts each object into a new file (it opens the new file, writes into it(append), and closes it). I use fopen/fclose, fread and fwrite. test.bin contains 20,000 objects. This program runs under linux with g++ in 1 sec but in VS2008 in debug/release mode in 1min! There are reasons why I don't do them in batches or don't keep them in memory or any other kind of optimizations. I just wonder why it is that much slow under windows. Thanks,

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• Is it possible to give a python dict an initial capacity (and is it usefull)

  - by Peter Smit

  I am filling a python dict with around 10,000,000 items. My understanding of dict (or hashtables) is that when too much elements get in them, the need to resize, an operation that cost quite some time. Is there a way to say to a python dict that you will be storing at least n items in it, so that it can allocate memory from the start? Or will this optimization not do any good to my running speed? (And no, I have not checked that the slowness of my small script is because of this, I actually wouldn't now how to do that. This is however something I would do in Java, set the initial capacity of the HashSet right)

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• POST data disapearing on large file upload

  - by DfKimera

  I'm having issues with a file uploading utility in my PHP application. When sending large files (9MB+) over the form, I get a very odd behaviour: the POST data I've included in the form dissapears, including the file information. I've already increased all PHP limits I could (time limit, max input time, post max size, memory limit and upload max filesize) and I still can't get the proper behaviour. I've tried replacing the regular HTTP forms with a Flash-based solution (SWFUpload, www.swfupload.org), still the same behaviour. I've tried multiple files of similar sizes and its definitely not a particular file issue. I've debugged the POST vars sent using Firebug, and the correct variables are still there in the header, together with the file. What could be going on here?

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• Is it possible to deny access to SQL Server from specific programs?

  - by Paul McLoughlin

  Currently one of our databases (SQL Server 2008) is accessed via a number of different mechanisms: .Net SqlClient Data Provider; SQL Server Management Studio; various .Net applications and 2007 Microsoft Office system (basically Excel). I see that in the sys.dm_exec_sessions DMV it is possible to see the program name of the program accessing the database for the current sessions. My question is: is it possible for one to deny access from a particular named program? First prize would be if this could be done for any named program, but we would gain a great deal of benefit from being able to deny access to this specific database from all Microsoft Office applications (especially Excel).

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• Weird compatibility problem with .Net 3.5 and 4.0 assemblies (NATUPnPLib)

  - by Juha

  I'm having trouble getting NATUPnP 1.0 Type Library to work with Framework 3.5 in Visual Studio 2010. If I use .Net 4.0, it works just fine, but with .Net 3.5, NATUPNPLib's namespace looks excactly like NETCONLib's. For example this Port Forwarding Management Application sample from this site: http://pietschsoft.com/post/2009/02/05/NET-Framework-Communicate-through-NAT-Router-via-UPnP.aspx ..is using .Net 3.5, but I can't get it to compile in Visual Studio 2010 unless I change it to .Net 4.0. I haven't tried, but I bet in Visual Studio 2008 there would be no problems.

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• Detect movie being played (Windows)

  - by modosansreves

  Watching a movie is quite a different user activity. User doesn't touch neither mouse nor keyboard. Yet he 'actively' uses the computer. Thus, screensaver shouldn't run, indexing should be performed with care etc. On the other side, playing video requires either using direct write to video memory, or DirectShow, or some other API. This may be the key to the answer. What is the Dead Simple Way to determine that a video is being played?

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• Base64 encoding in PHP not working for '&' and '#' ?

  - by Angad

  My knowledge about base64 is pretty limited. I am using it as an alternative to string escaping in a content management system, for I had been warned about how weaknesses have been found in mysql_real_escape_string(); and quite sheepishly so, as I am aware of how it buffs text size up. PHP seems to truncate everything after an instance of # or & in the string; please help me out of this one. Also, comment on whether using base64 to maintain the 'trueness' of post content in the CMS is just plain retarded, or a wise move. Thanks for your time :)

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• Web framework recommendation for python (webservices, auth, cache, ...)

  - by illuminated

  Hi all, Googling for the past week, but cannot finally decide which python web framework would be right for me. The web app I'm about to develop would be almost completely "pure" html with js (jQuery). Server side would have to do the following: authentication session management caching web services (almost all the on page data would be pulled with jQuery through web services) secured web services (through some form of authentication; this is for remote accessing some of the web services though other web apps, desktop/mobile applications) If there is a good tutorial/guide/idea for how to do this in Django I would be most thankfull if someone could share it as I already have experience with it. The thing that made me start thinking about other frameworks is Django's built in ORM. I know I could swap it with SQLAlchemy, but wouldn't go down that road if I'm not sure all the rest of the requirements is supported. Thanks all in advance.

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• CMS (Web Application OR Windows Application)

  - by Raha

  I am a little bit puzzled about something. I am creating a ASP.NET MVC eCommerce application and currently I have written all the back end in ASP.NET MVC. I was thinking if its better to write all the management in WPF instead of HTML, as its probably even less prone to be exploited by hackers. I am a Windows user so I am not really bothered about using Linux/Mac at the moment so I am quite aware that having all the back-end written in HTML will allow users to have access to the admin area using other OS. I would like to see what are the advantages and disadvantages of having WPF to manage the content of the website as its probably much easier to develop and manage (think about Live Writer).

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• Inheriting database connection in PHP OOP

  - by vrode

  My abstract class Database is made for database interaction and any child of this class (UserDatabase, ActionDatabase, EventDatabase) inherits its database connection which is defined as static. `abstract class Database { static $connection = mysql_connect( ); } class UserDatabase extends Database { ... public function __construct( ) { $connection ? "connected" : "not connected"; $this-table = "users"; mysql_query( "FROM " . $this-table . " SELECT *" ); } } ` Does that mean, that my database connection is only set up and stored in memory once and passed on to subclasses as reference without being replicated for each instance? Is this how you would implement you OOP-correct database interface?

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• List of phones that will work with Eclipse?

  - by user1058647

  I need an android phone to test my apps with that will work with Eclipse. It has to be low cost, run Gingerbread with modest memory and CPU. Thinking that any android phone would work I recently purchased a Virgin Mobil Chaser but as it turns out, it cannot be seen by either Eclipse or adb (but device manager does see the phone). Another developer has also had the same identical problem with the Chaser. I could keep buying phones and see if they work but that could be long and frustrating. I hope to find a "no contract" phone. Is there any list of phones that work with Eclipse. Does anyone know of any other Virgin Mobil phones that will work? thanks, Gary

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• Retrieving data from an encrypted text file?

  - by user

  Let's say I have a text file contains my data. data : ab bc de - encrypted data on text file : ba cb ed I want to find bc from text file, so I have to decrypt the text file with this code : SL:=TStringList.create; SL.LoadFromFile(textfile) SLtemp:=TStringList.create; for I := 0 to SL.Count - 1 do SLtemp.Add(ReverseString(SL[i])); //decrypt SL.Free; for I := 0 to SLtemp.Count - 1 do if SLtemp[i] = 'bc' then begin showmessage('found'); break; end; SLtemp.Free; I think my way is wasting resources. I have to load whole file to memory and decrypt them. I need some suggestions here to find quickly a specific line from an encrypted text. Thanks.

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• How to determine where a Mailitem is being opened from in Outlook 2007 using VSTO 2005 SE

  - by Adam

  I have an Outlook 2007 Add-in in VSTO 2005 SE that allows users to save e-mails into our document management system. From within our system users are able to open e-mails they have previously saved. However, when doing so I need to try and prevent them from saving them again. I am trying to figure out how to determine if the Mailitem being opened is coming from the Outlook e-mail client or from an external source. I know that normally the EntryId Property of the Mailitem is null or empty string when a Mailitem has not been previously saved in Outlook, however, it seems like when a Mailitem is being opened from within our system the EntryID is not null.

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• how to prevent database to add slash to quotes

  - by black sensei

  i know this sounds really common and so trivial but , am having a challenge here. I have a web site with Zend/Doctrine and i use ckeditor for the backend management. after uploading the site i've realized that during edit testing the look and feel of the site is messed up. with the help of firebug, i've seen that there are slashes all over the html. after inline edition, the look and feel came back to normal. There are so many files , i can't think of doing other decoding before outputting data from mysql. What options do i have to solve this problem. the site is up already and i feel a bit unconfortable about this. Can anyone give a hint? thanks

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• Predicting performance for an iPhone/iPod Touch App

  - by Avizz

  I don't have an iPhone Developer Program Account yet and will be getting one in the next couple of days. Can instruments be used with the simulator to give a rough estimate on how well my app may perform? Using instruments I checked and fixed all the leaks it was detecting, and it appears that my memory usage maxes out at about 5.77mb. Is there any other tests I could perform with instruments to judge how well my app would perform? I realize there is no way other then the actual device to get a definite answer, it would be nice to get an estimate.

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• c, pass awk syntax as argument to execl

  - by Skuja

  I want to run following command in c to read systems cpu and memory usage: ps aux|awk 'NR > 0 { cpu +=$3; ram+=$4 }; END {print cpu,ram}' I am trying to pass it to execl command and after that read its output: execl("/bin/ps", "/bin/ps", "aux|awk", "'NR > 0 { cpu +=$3; ram+=$4 }; END {print cpu,ram}'",(char *) 0); but in terminal i am getting following error: ERROR: Unsupported option (BSD syntax) I would like to know how to properly pass awk as argument to execl?

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• Error HRESULT E_FAIL when creating Exchange mailbox (CDOEXM.IMailboxStore.CreateMailbox)

  - by Matt

  I am trying to automate the process of creating an Exchange Mailbox for AD users and am running into an issue. When calling the CreateMailbox method I am receiving the error "Error HRESULT E_FAIL has been returned from a call to a COM component". I have installed and referenced the Exchange Management Tools and am using impersonation for permissions. Here is the code: ActiveDs.IADsUser adUser = (ActiveDs.IADsUser)user.NativeObject; adUser.AccountDisabled = !Active; user.CommitChanges(); //Set Password user.Invoke("SetPassword", Password); user.CommitChanges(); //Create Mailbox IMailboxStore mailbox; mailbox = (IMailboxStore)adUser; mailbox.CreateMailbox("LDAP://CN=StandardUsers,CN=StandardUsers,CN=InformationStore,CN=xxxxx," + "CN=Servers,CN=First Administrative Group,CN=Administrative Groups," + "CN=xxxxx Main,CN=Microsoft Exchange,CN=Services,CN=Configuration,DC=xxxxx,DC=com"); user.CommitChanges();

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