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• OOP: how much program logic should be encapsulated within related objects/classes as methods?

  - by Andrew

  I have a simple program which can have an admin user or just a normal user. The program also has two classes: for UserAccount and AdminAccount. The things an admin will need to do (use cases) include Add_Account, Remove_Account, and so on. My question is, should I try to encapsulate these use-cases into the objects? Only someone who is an Admin, logged in with an AdminAccount, should be able to add and remove other accounts. I could have a class-less Sub-procedure that adds new UserAccount objects to the system and is called when an admin presses the 'Add Account' button. Alternatively, I could place that procedure as a method inside the AdminAccount object, and have the button event execute some code like 'Admin.AddUser(name, password).' I'm more inclined to go with the first option, but I'm not sure how far this OO business is supposed to go.

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• Issues with absolute paths for js files in website

  - by Vinni

  Hello guys, I have a website which has so many sub folders in it. I have following paths references to my js and css files. <link rel="stylesheet" type="text/css" href="css/styles.css" /> <script type="text/javascript" src="js/jquery.js"></script> the above code is working fine on my local machine. the JS file is not loading when i host the website into production server. Problem in my hosting server is my website is ponted to www.somewebsitename.com instead www.somewebsitename.com/home.aspx . When I load the page with www.somewebsitename.com/home.aspx this url it is loading all the js files it is not loading files only when I load the page with www.somewebsitename.com. Please solve my problem. How to reference JS files so that they ll loaded how ever u visit the page.

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• Looping through JSON arrays

  - by George

  I'm trying to pull the field names in the header of some JSON output. The following is a sample of the JSON header info: {"HEADER":{"company":{"label":"Company Name"},"streetaddress":{"label":"Street Address"},"ceo":{"label":"CEO Name","fields":{"firstname":{"label":"First Name"},"lastname":{"label":"Last Name"}}} I'm able to loop through the header and output the field and label (i.e. company and Company Name) using the following code: obj = JSON.parse(jsonResponse); for (var key in obj.HEADER) { response.write ( obj.HEADER[key].label ); response.write ( key ); } but can't figure out how to loop through and output the sub array of fields (i.e. firstname and First Name). Any ideas?

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• Confused by Perl grep function

  - by titaniumdecoy

  I don't understand the last line of this function from Programming Perl 3e. Here's how you might write a function that does a kind of set intersection by returning a list of keys occurring in all the hashes passed to it: @common = inter( \%foo, \%bar, \%joe ); sub inter { my %seen; for my $href (@_) { while (my $k = each %$href) { $seen{$k}++; } } return grep { $seen{$_} == @_ } keys %seen; } I understand that %seen is a hash which maps each key to the number of times it was encountered in any of the hashes provided to the function.

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• Math: How to sum each row of a matrix

  - by macek

  I have a 1x8 matrix of students where each student is a 4x1 matrix of scores. Something like: SCORES S [62, 91, 74, 14] T [59, 7 , 59, 21] U [44, 9 , 69, 6 ] D [4 , 32, 28, 53] E [78, 99, 53, 83] N [48, 86, 89, 60] T [56, 71, 15, 80] S [47, 67, 79, 40] Main question: Using sigma notation, or some other mathematical function, how can I get a 1x8 matrix where each student's scores are summed? # expected result TOTAL OF SCORES S [241] T [146] U [128] D [117] E [313] N [283] T [222] S [233] Sub question. To get the average, I will multiply the matrix by 1/4. Would there be a quicker way to get the final result? AVERAGE SCORE S [60.25] T [36.50] U [32.00] D [29.25] E [78.25] N [70.75] T [55.50] S [58.25] Note: I'm not looking for programming-related algorithms here. I want to know if it is possible to represent this with pure mathematical functions alone.

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• Reporting Services is displaying extra rows for minimised row groups

  - by Graphain

  Hi, I have a fairly basic SQL Server Reporting Services report that is using nested row groups. Each sub-group depends on expanding its parent to be visible which is all pretty standard. The layout is something like this: { Company { { Car SUM(Price) { { { Part Price My desired result when expanded is something like this (which I get fine): - SuperCarCompany - SuperCar 20 Door 20 - SuperCar2 70 Door 30 Window 40 - OtherCarCompany - SuperCar2 50 /* Same SuperCar2 */ Door 50 - MoreCarCompany - BestCarEver 535 Engine 500 Door 30 Window 5 And when opened initially something like this: + SuperCarCompany + OtherCarCompany + MoreCarCompany However, I'm getting this: + SuperCarCompany + SuperCar2 70 (i.e. sum of all SuperCar2) + OtherCarCompany + SuperCar 20 + MoreCarCompany + BestCarEver 535 and I can even expand these superfluous rows like this: + SuperCarCompany - SuperCar2 70 (i.e. sum of all SuperCar2) Door 30 (i.e. first child of any SuperCar2) The superflous rows dissapear immediately when I expand the expected row above it (i.e. I'd need to expand all expected rows to get rid of all superflous rows). Any idea on the cause?

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• Python - compare nested lists and append matches to new list?

  - by Seafoid

  Hi, I wish to compare to nested lists of unequal length. I am interested only in a match between the first element of each sub list. Should a match exist, I wish to add the match to another list for subsequent transformation into a tab delimited file. Here is an example of what I am working with: x = [['1', 'a', 'b'], ['2', 'c', 'd']] y = [['1', 'z', 'x'], ['4', 'z', 'x']] match = [] def find_match(): for i in x: for j in y: if i[1] == j[1]: match.append(j) return match This results in a series of empty lists. Is it better to use tuples and/or tuples of tuples for the purposes of comparison? Any help is greatly appreciated. Regards, Seafoid.

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• Including uncovered files in Devel::Cover reports

  - by Markus

  I have a project setup like this: bin/fizzbuzz-game.pl lib/FizzBuzz.pm test/TestFizzBuzz.pm test/TestFizzBuzz.t When I run coverage on this, using perl -MDevel::Cover=-db,/tmp/cover_db test/*.t ... I get the following output: ----------------------------------- ------ ------ ------ ------ ------ ------ File stmt bran cond sub time total ----------------------------------- ------ ------ ------ ------ ------ ------ lib/FizzBuzz.pm 100.0 100.0 n/a 100.0 1.4 100.0 test/TestFizzBuzz.pm 100.0 n/a n/a 100.0 97.9 100.0 test/TestFizzBuzz.t 100.0 n/a n/a 100.0 0.7 100.0 Total 100.0 100.0 n/a 100.0 100.0 100.0 ----------------------------------- ------ ------ ------ ------ ------ ------ That is: the totally-uncovered file bin/fizzbuzz-game.pl is not included in the results. How do I fix this?

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• How are SaaS/Mult-Tenancy apps implementing email notifications (sending and receving)?

  - by Mark Redman

  Given multi-tenant application, How are vendors implementing email notifications from an email account setup and programming perspective: Sending emails could come from a generic account: eg [email protected] or [email protected], this seems reasonable considering reply addresses and lilnks can be contained within the email contents. Receiving Emails: How would an application receive email, for instance; to generate support tickets or assign comments in an email to a project/task. I have seen ID's within the subject and some reply to addresses containing the account name eg: [email protected] I realise one can programatically connect to a pop3 server and receive emails and look for the IDs with the subject, but is there a way of setting up and receiving email to a single pop3 account from multiple sub-host name email addresses (not sure on terminology there) eg: [email protected] or [email protected] and check the Account Name from the address? (similar to checking subdomains on a URL) Any practices, experience, comments or sughestions? (not sure its relevant, but using C# asp.net-mvc and services etc)

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• Store JsTree order back into database

  - by Scott

  Hi I am using JsTree and got some of it working with my database. Such as deleting a node, renaming a node, etc. I am having problems with saving the ROOT folders order back to the database. When I move the root folders, it doesnt save order. When I move the sub folders around, it saves order fine. Anyone know what I am doing wrong? I think it's my javascript for the onmove. here's a demo of what I am talking about. http://healthsharing.com/jstree/demo.php

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• bash : recursive listing of all files problem

  - by Michael Mao

  Run a recursive listing of all the files in /var/log and redirect standard output to a file called lsout.txt in your home directory. Complete this question WITHOUT leaving your home directory. An: ls -R /var/log/ /home/bqiu/lsout.txt I reckon the above bash command is not correct. This is what I've got so far: $ ls -1R .: cal.sh cokemachine.sh dir sort test.sh ./dir: afile.txt file subdir ./dir/subdir: $ ls -R | sed s/^.*://g cal.sh cokemachine.sh dir sort test.sh afile.txt file subdir But this still leaves all directory/sub-directory names (dir and subdir), plus a couple of empty newlines How could I get the correct result without using Perl or awk? Preferably using only basic bash commands(this is just because Perl and awk is out of assessment scope)

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• How to free member (i.e BSTR, SAFEARRAY, VARIANT) of an IDL User Defined Structure which is encapsul

  - by Picaro De Vosio

  Hi, I have a structure defined in IDL. This structure has following members: { BSTR m_sFirst; BSTR m_sSecond; VARIANT m_vChildStruct; //This member encapsulate a sub structure SAFEARRAY __RPC_FAR * m_saArray; }CustomINFO; I am allocating the memory for the structs using CoTaskMemAlloc and encapsulating it in Variant as follows: vV-vt = VT_RECORD; vV-pvRecord = pStruct; //Pointer of sturct vV-pRecInfo = pRI; //RecordInfo Interface Is it enough to call VariantClear to deallocate the memory of struct and its members? Will it also release the IRecordInfo interface? Or i have to manually get the encapsulated struct and deallocate each member myself and then use CoTaskMemFree to deallocate sturct. Thanks Picaro De Vosio

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• Why are mercurial subrepos behaving as unversioned files in eclipse

  - by noam

  I am trying to use the subrepo feature of mercurial, using the mercurial eclipse plugin . I created and added the .hgsub file in the root repo, put all the mappings of the sub repos in it, and committed + pushed. Then, I pulled the root repo in eclipse, using import-mercurial. Now I see that all the subrepos appear as though they are unversioned (no "orange cylinder" icon next to their corresponding folders in the eclipse file explorer). Furthermore, when I right click on one of the subrepos, I don't get all the hg commands in the "team" menu as I usually get, with root projects - no "pull", "push" etc. Also, when I made a change to a file in a subrepo, and then "committed" the root project, it told me there were no changes found.

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• Is it possible for a called routine to force its caller to return?

  - by Kinopiko

  If I have Perl module like package X; and an object like my $x = X->new (); Inside X.pm, I write an error handler for $x called handle_error, and I call it sub check_size { if ($x->{size} > 1000) { $x->handle_error (); return; } } is there any way to make handle_error force the return from its caller routine? In other words, in this example, can I make handle_error do return in check_size without actually writing return there?

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• Changing the Default View Engine's view search behavior.

  - by bradhe

  I'm working with ASP.NET MVC 2. I have a bunch of partial views that I render based on different conditions within the same controller. I'd like to not put the physical partial view files in with the controller's other views. I know that when I want a ViewResult using the View() or PartialView() methods the default view engine will search through the folder in the Views directory associated with the controller (i.e. if my controller is called Register it will look in the Register folder under Views) and also in the Shared folder. Is there any way to change this behavior, or perhaps tell it specifically where to look for the view -- heck, even give it a specific file to render? Is that possible? Perhaps even a sub-folder under the Shared folder will work...

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• Django model field value preprocessing before returning

  - by Satoru.Logic

  Hi, all. I have a Note model class like this: class Note(models.Model): author = models.ForeignKey(User, related_name='notes') content = NoteContentField(max_length=256) NoteContentField is a custom sub-class of CharField that override the to_python method in purpose of doing some twitter-text-conversion processing. class NoteContentField(models.CharField): __metaclass__ = models.SubfieldBase def to_python(self, value): value = super(NoteContentField, self).to_python(value) from ..utils import linkify return mark_safe(linkify(value)) However, this doesn't work. When I save a Note object like this: note = Note(author=request.use, content=form.cleaned_data['content']) The conversed value is saved into the database, which is not what I wanna see. Would you please tell me what's wrong with this? Thanks in advance.

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• Is it possible for a Perl subroutine to force its caller to return?

  - by Kinopiko

  If I have Perl module like package X; and an object like my $x = X->new (); Inside X.pm, I write an error handler for $x called handle_error, and I call it sub check_size { if ($x->{size} > 1000) { $x->handle_error (); return; } } Is there any way to make handle_error force the return from its caller routine? In other words, in this example, can I make handle_error do return in check_size without actually writing return there?

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• Blackberry JDE generating bad .jad file (does not match compiled .cod file)

  - by matkas

  I Have a BB application that gets compiled into 3 siblings cod file. ( actualy one cod fil contaning 3 sub cod files). app.cod |--app.cod |--app-1.cod |--app-2.cod which is normal. the jad refers to those 3 inner .cod files. Now I have add some feature to my app, it is getting a little bit bigger. the jad now refers to 4 inner .cod files. but there is still 3 inside the app.cod that is generated. so I now still have app.cod |--app.cod |--app-1.cod |--app-2.cod but with the jad refering to app.cod app-1.cod app-2.cod AND app-3.cod. what is wrong the my compiled program? is it a bug from the JDE? I am using JDE 4.5.

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• Xcode 4.2 how include one project into another one?

  - by Alex Stone

  I keep searching, but cannot find a clear and simple explanation on how to include one XCode project, along with all of it's sub-classes into another project. I routinely see stuff like that in sample projects that I download off the web, but do not know how to do this myself. Within XCode, along with .h and .m files, and folders, there's a whole new project, starting with a blue xcode project icon, that is expandable to contain everything within the project. Please, can someone explain to me step by step what do I need to do to add one XCode project into another one? I've seen a ton of one liners like "header search paths", but that does not tell me much. UPDATE: After re-reading the documentation, I realized that the project to include must be dragged ONTO the BLUE project icon of the parent project. Regular sources can be dragged anywhere, but a project must be dragged onto a project. Thank you!

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• HASH reference error with HTTP::Message::decodable

  - by scarba05

  Hi, I'm getting an "Can't use an undefined value as a HASH reference" error trying to call HTTP::Message::decodable() using Perl 5.10 / libwww installed on Debian Lenny OS using the aptitude package manager. I'm really stuck so would appreciate some help please. Here's the error: Can't use an undefined value as a HASH reference at (eval 2) line 1. at test.pl line 4 main::__ANON__('Can\'t use an undefined value as a HASH reference at enter code here`(eval 2)...') called at (eval 2) line 1 HTTP::Message::__ANON__() called at test.pl line 6 Here's the code: use strict; use HTTP::Request::Common; use Carp; $SIG{ __DIE__ } = sub { Carp::confess( @_ ) }; print HTTP::Message::decodable();

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• Python: wxpython wx.media.MediaCtrl - millisecond seek capability

  - by PPTim

  I've been searching for a media player that can display sub-second resolution in videos. Some pointed me to the Frame stepping functionality in MPC, but I'd like even more than that. I know from previous experience with wxPython that the wx.media.MediaCtrl both displays and (as fast as i can click with the mouse anyway) stops the video with millisecond-precision. The code is here, and runs no-problem with python +wxpython module. Has anyone come across other video players that handle this functionality, or has seen a more robust/developed video player written with wxPython that allows for this level of precision? This is possibily a one-off task so I'd like to use existing solutions if possible. Thanks.

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• Should I obscure primary key values?

  - by Scott

  I'm building a web application where the front end is a highly-specialized search engine. Searching is handled at the main URL, and the user is passed off to a sub-directory when they click on a search result for a more detailed display. This hand-off is being done as a GET request with the primary key being passed in the query string. I seem to recall reading somewhere that exposing primary keys to the user was not a good idea, so I decided to implement reversible encryption. I'm starting to wonder if I'm just being paranoid. The reversible encryption (base64) is probably easily broken by anybody who cares to try, makes the URLs very ugly, and also longer than they otherwise would be. Should I just drop the encryption and send my primary keys in the clear?

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• How to force visual styles when using .NET forms Interop from VB6

  - by Matt

  I have created a VB.NET Class Library that exposes some COM Interop sub routines. These in turn show various forms that are contained within the Class Library. When the forms are shown from VB6 they do not inherit the visual styles of the operating system and act like VB6 controls. I gather that this probably by design but is there some way to force/control visual styles manually in the .NET assembly? I would imagine that if I use a manifest in my VB6 app then everything will use the correct style but I would like to be able to control this myself if possible because we are using 3rd party controls in VB6 that do not require a manifest.

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• Why does HTTP::Message::decodable complain about "Can't use an undefined value as a HASH reference"?

  - by scarba05

  I'm getting a Can't use an undefined value as a HASH reference error trying to call HTTP::Message::decodable() using Perl 5.10 / libwww installed on Debian Lenny OS using the aptitude package manager. I'm really stuck so would appreciate some help please. Here's the error: Can't use an undefined value as a HASH reference at (eval 2) line 1. at test.pl line 4 main::__ANON__('Can\'t use an undefined value as a HASH reference at enter code here`(eval 2)...') called at (eval 2) line 1 HTTP::Message::__ANON__() called at test.pl line 6 Here's the code: use strict; use HTTP::Request::Common; use Carp; $SIG{ __DIE__ } = sub { Carp::confess( @_ ) }; print HTTP::Message::decodable();

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• How can I remove .NET isolated storage setting folders during WiX uninstallation?

  - by Luke

  I would like to remove the isolated storage folders that are created by a .NET application when using My.Settings etc. The setting files are stored in a location like C:\Users\%Username%\AppData\Roaming\App\App.exe_Url_r0q1rvlnrqsgjkcosowa0vckbjarici4 As per this question StackOverflow: Removing files when uninstalling Wix I can uninstall a folder using: <Directory Id="AppDataFolder" Name="AppDataFolder"> <Directory Id="MyAppFolder" Name="My"> <Component Id="MyAppFolder" Guid="YOURGUID-7A34-4085-A8B0-8B7051905B24"> <CreateFolder /> <RemoveFile Id="PurgeAppFolder" Name="*.*" On="uninstall" /> </Component> </Directory> </Directory> <!-- LocalAppDataFolder--> This doesn't support sub-folders etc. Is the only option a custom .NET action or is there a more simple approach for removing these .NET generated setting folders?

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