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• C# .NET 4.0 and Generics

  - by Mr Snuffle

  I was wondering if anyone could tell me if this kind of behaviour is possible in C# 4.0 I have an object hierarchy I'd like to keep strongly typed. Something like this class ItemBase {} class ItemType<T> where T : ItemBase { T Base { get; set; } } class EquipmentBase : ItemBase {} class EquipmentType : ItemType<EquipmentBase> {} What I want to be able to do to have something like this ItemType item = new EquipmentType(); And I want item.Base to return type ItemBase. Basically I want to know if it's smart enough to strongly typed generic to a base class without the strong typing. Benefit of this being I can simply cast an ItemType back to an EquipmentType and get all the strongly typedness again. I may be thinking about this all wrong...

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• Where can I find free WPF controls and control templates?

  - by Geoffrey Chetwood

  Duplicate: Where can I find free WPF controls and control templates? I am looking for some recommendations on good places to find libraries of controls/templates/styles for WPF. I know about the usual places like Infragistics, but it seems to me that there should be some kind of community effort by now to share nice, clean, well written controls for WPF controls. I am not big on the design side, and it would be nice to fill out my personal libraries with some nice examples from people who are better at design. Any ideas/recommendations?

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• Python: Define Classes in Packages

  - by rfkrocktk

  I'm learning Python and I have been playing around with packages. I wanted to know the best way to define classes in packages. It seems that the only way to define classes in a package is to define them in init.py of that package. Coming from Java, I'd kind of like to define individual files for my classes. Is this a recommended practice? I'd like to have my directory look somewhat like this: recursor/ __init__.py RecursionException.py RecursionResult.py Recursor.py So I could refer to my classes as "recursor.Recursor," "recursor.RecursionException," and "recursor.RecursionResult.py". Is this "do-able" or recommended in Python?

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• SNMP: ASN.1 MIB Definitions. Referencing a table within a table

  - by Doug

  Its's been a while since I've written ASN.1 so.. Our data model is comprised of several table definitions within a table. This is not workable in SNMP, so we need to flatten the definitions. The easiest way to do this would be to have the embedded table indexed by the same OID as the parent table. Thus someTableEntry ::= SEQUENCE { someTableIndex Integer32, someTableDomain Integer32, someTableFooTable SEQUENCE OF SomeTableFooTable } becomes someTableEntry ::= SEQUENCE { someTableIndex Integer32, someTableDomain Integer32, } someTableFooTable ::= SEQUENCE { someTableIndex Integer32, .... } The good thing is that in our application there will NEVER be any kind of SET, GET or GET NEXT so no need for SNMP walk (there are some very good reasons for this that supersede the need for network management elegance. All attributes will be reported via traps only. I think this is a valid SNMP MIB definitions but wanted to get some feedback. Thanks in advance.

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• Can HTTP URIs have non-ASCII characters?

  - by Cheeso

  I tried to find this in the relevant RFC, IETF RFC 3986, but couldn't figure it. Do URIs for HTTP allow Unicode, or non-ASCII of any kind? Can you please cite the section and the RFC that supports your answer. NB: For those who might think this is not programming related - it is. It's related to an ISAPI filter I'm building. Addendum I've read section 2.5 of RFC 3986. But RFC 2616, which I believe is the current HTTP protocol, predates 3986, and for that reason I'd suppose it cannot be compliant with 3986. Furthermore, even if or when the HTTP RFC is updated, there still will be the issue of rationalization - in other words, does an HTTP URI support ALL of the RFC3986 provisos, including whatever is appropriate to include non US-ASCII characters?

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• Success verification of mail() function PHP

  - by Jared

  Hi Is it possible to check if the php can get some kind of a ping/flag back from exchange mail server to say "yes, email has been sent off to the intended recipient"? According to the PHP manual, the return of mail() boolean could mean; "It is important to note that just because the mail was accepted for delivery, it does NOT mean the mail will actually reach the intended destination." Does this mean, PHP can return success but actually there could be a problem on the mail server that php wouldn't know about it? and in this case no email has been sent and the user is none the wiser? TIA Jared

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• JAVA Classes in Game programming.

  - by Gabriel A. Zorrilla

  I'm doing a little strategy game to help me learn Java in a fun way. The thing is I visioned the units as objects that would self draw on the game map (using images and buffering) and would react to the mouse actions with listeners attached to them. Now, based on some tutorials I've been reading regarding basic game programming, all seems to be drawn in the Graphics method of my Map class. If a new unit emerges, i just update the Map.Graphics method, it's not as easy as making a new Unit object which would self draw... In this case, I'd be stuck with a whole bunch of Map methods instead of using classes for rendering new things. So my question is, is it possible to use classes for rendering units, interface objects, etc, or i'll have to create methods and just do some kind of structural programming instead of object oriented? I'm a little bit confused and I'd like to have a mental blueprint of how things would be organized. Thanks!

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• How to get a clipboard paste notification and provide my own data?

  - by Uwe Keim

  For a small utility I am writing (.NET, C#), I want to monitor clipboard copy operations and clipboard paste operations. My idea is to provide my own data when pasting into an arbitrary application. The monitoring of a copy operation can be easily done by using a clipboard viewer. Something that seems much more advanced to me is to write a "clipboard paste provider": Answer to "what formats are available" queries of applications. Supply data to application paste operations. I found this posting and this posting, but none of them seems to really help me. What I guess is that I somehow have to mimic/hijack the current clipboard. Question: Is it possible to "wrap" the clipboard in terms of paste operations and provide my own kind of "clipboard proxy"? Thanks Uwe

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• Android - Problem in Edittext

  - by PM - Paresh Mayani

  Hi, I am facing trouble to set WrapText kind of facility in EditText. Problem: When i try tp enter data in EditText, it goes beyond the screen width (scrolling horizontally). Instead of it should be appear in next-line. Please suggest me what should i do ?? Please have a look at below image: I have done the below XML coding: <TableLayout android:layout_width="fill_parent" android:layout_height="fill_parent" android:paddingTop="10dp" android:paddingLeft="10dp" android:paddingRight="10dp" android:stretchColumns="1"> <TableRow android:id="@+id/TableRow02" android:layout_width="fill_parent" android:layout_height="wrap_content"> <TextView android:text="Name:" android:id="@+id/TextView01" android:layout_width="80dp" android:layout_height="wrap_content" android:textSize="16dip"> </TextView> <EditText android:id="@+id/txtViewName" android:layout_height="wrap_content" android:layout_width="wrap_content" android:inputType="textFilter|textMultiLine|textNoSuggestions" android:scrollHorizontally="false"> </EditText> </TableRow> </TableLayout>

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• Unique Key in MySql

  - by Vinodtiru

  I have a table with four Columns. Col1, Col2, Col3, and Col4. Col1, Col2, Col3 is string and Col4 is a integer primary key with Auto Increment. Now my requirement is to have unique combination of Col2 and Col3. I mean to say like. Insert into table(Col1,Col2,Col3) Values('val1','val2','val3'); Insert into table(Col1,Col2,Col3) Values('val4','val2','val3'); the second statement has to throw error as the same combination of 'val2','val3' is present in the table. But i cant make it as a primary key as i need a auto increment column and for that matter the col4 has to be primary. Please let me know a approach by which i can have both in my table. Any kind of help is appreciated. Thanks.

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• Jquery Tabs - Change css depending on a specific tab

  - by Jeff Dias

  So, I am working in this page http://universidadedoingles.com.br/text-tabs/tabs-text.html As you guys can see, I have four tabs and an arrow right below, I need to do that the arrow go below the selected tab, if a click on tab 3, that arrow should go below tab 3, simple as that! but I don`t know! You also can see that when the page loads on tab 1 and you click on tab 2 the effect I want works pretty well, here`s the jquery I am using for that: $(document).ready(function() { $("a.tab2").click(function() { $(".arrow-spacer").addClass("tabs2"); }); }); That`s it, thank you vey much for any kind of help. p.S - i am using a mac, so theres no IE for testing yet, this looks good in Safari and Chrome.

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• How to avoid Cartesian product in an INNER JOIN query?

  - by flhe

  I have 6 tables, let's call them a,b,c,d,e,f. Now I want to search all the colums (except the ID columns) of all tables for a certain word, let's say 'Joe'. What I did was, I made INNER JOINS over all the tables and then used LIKE to search the columns. INNER JOIN ... ON INNER JOIN ... ON.......etc. WHERE a.firstname ~* 'Joe' OR a.lastname ~* 'Joe' OR b.favorite_food ~* 'Joe' OR c.job ~* 'Joe'.......etc. The results are correct, I get all the colums I was looking for. But I also get some kind of cartesian product, I get 2 or more lines with almost the same results. How can i avoid this? I want so have each line only once, since the results should appear on a web search.

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• How do I create an empty array/matrix in NumPy?

  - by Ben

  I'm sure I must be being very dumb, but I can't figure out how to use an array or matrix in the way that I would normally use a list. I.e., I want to create an empty array (or matrix) and then add one column (or row) to it at a time. At the moment the only way I can find to do this is like: mat = None for col in columns: if mat is None: mat = col else: mat = hstack((mat, col)) Whereas if it were a list, I'd do something like this: list = [] for item in data: list.append(item) Is there a way to use that kind of notation for NumPy arrays or matrices? (Or a better way -- I'm still pretty new to python!)

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• F# working with DataReader

  - by mamu

  let getBytesData x = let len = reader.GetBytes(1, int64 0, null, 0, 0); // Create a buffer to hold the bytes, and then // read the bytes from the DataTableReader. let buffer : byte array = [||] reader.GetBytes(1, int64 0, buffer, 0, int32 len) |> ignore buffer let retVal = List [ while reader.Read() do yield (reader.GetString(0), getBytesData reader, reader.GetDateTime(2)) ] I have above code to read bytes[] from datareader. getBytesData function takes reader and returns bytes[] from reader. everything works fine but it getBytesData function is working very non-functional way. Is there any way i can optimize in F#? Sorry for kind of question, but i have started a new project on F# to squeeze all juice out of it, so trying to get each line most optimal way

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• Mobile development decision - Future wise (Iphone,android,symbian)

  - by Idan

  Hi, I would like to learn mobile development, but I'm not sure which category would be the most cost effective one. I know it's kind of a prophecy question, but anyhow, suggestions would be welcomed. So, as i'm pretty familiar with C++ development , I though about learning QT. I understand that using QT, I can develop once and then deploy to symbian,Mee-go, and of course to windows, linux and more. (does that mean I won't have to lean each OS internal calls, and just learn the QT library ? ) Learning development for android , mean I will have to learn Java, which is not my preferred way of action right now. Another option is to learn Objective-C, but as it only apply to Iphone development, I think it's a pretty narrow zone for me. I want to learn a library, which would be a wise decision career wise. Any recommendations ?

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• MySQL unique clustered constraint not constraining as expected

  - by igor

  I'm creating a table with: CREATE TABLE movies ( id INT AUTO_INCREMENT PRIMARY KEY, name CHAR(255) NOT NULL, year INT NOT NULL, inyear CHAR(10), CONSTRAINT UNIQUE CLUSTERED (name, year, inyear) ); (this is jdbc SQL) Which creates a MySQL table with a clustered index, "index kind" is "unique", and spans the three clustered columns: full size However, once I dump my data (without exceptions thrown), I see that the uniqueness constraint has failed: SELECT * FROM movies WHERE name = 'Flawless' AND year = 2007 AND inyear IS NULL; gives: id, name, year, inyear 162169, 'Flawless', 2007, NULL 162170, 'Flawless', 2007, NULL Does anyone know what I'm doing wrong here?

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• Recording user data for heatmap with javascript

  - by Hanpan

  Hi, I was wondering how sites such as crazyegg.com store user click data during a session. Obviously there is some underlying script which is storing each clicks data, but how is that data then populated into a database? It seems to me the simple solution would be to send data via AJAX but when you consider that it's almost impossible to get a cross browser page unload function setup, I'm wondering if there is perhaps some other more advanced way of getting metric data. I even saw a site which records each mouse movement and I am guessing they are definitely not sending that data to a database on each mouse move event. So, in a nutshell, what kind of technology would I need in order to monitor user activity on my site and then store this information in order to create metric data? I am not looking to recreate GA, I'm just very interested to know how this sort of thing is done. Thanks in advance

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• Sandbox solutions seem to be too severely crippled.

  - by Vaccano

  I am learning SharePoint and the different kind of solutions you can deploy. From the training I am watching it seems like you should try your best to use a Sandbox Solution when ever possible. This is because Farm Solutions can mess things up too much. However, two of the main things I would do with WebParts are not supported in Sandbox Solutions. Those are Visual WebParts and WebPart communication. (The first is not allowed because it needs to hit the file system and the second is disallowed because it uses reflection). It seems to me that my WebParts will always want to do at least one of those things. (WebParts that don't communicate are not really that modular are they?) Am I missing the point or are Sandbox Solutions a "nice idea" that are not really used in actual code?

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• symfony: multiple apps, single login?

  - by gruner

  My symfony project is divided into several apps. Using the sfDoctrineGuard plugin I'd like to create another app just for login, and redirect to the appropriate app after login. My questions: • Is this advisable or does it go against how sfGuard is supposed to work? • Is there a way to redirect between applications without hardcoding the entire url? Is there a "symfony way" of doing it, or is this not how projects are supposed to function? (All I can find is this thread which is kind of vague on the specifics.)

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• Application Context in Rails

  - by Sean McMains

  Rails comes with a handy session hash into which we can cram stuff to our heart's content. I would, however, like something like ASP's application context, which instead of sharing data only within a single session, will share it with all sessions in the same application. I'm writing a simple dashboard app, and would like to pull data every 5 minutes, rather than every 5 minutes for each session. I could, of course, store the cache update times in a database, but so far haven't needed to set up a database for this app, and would love to avoid that dependency if possible. So, is there any way to get (or simulate) this sort of thing? If there's no way to do it without a database, is there any kind of "fake" database engine that comes with Rails, runs in memory, but doesn't bother persisting data between restarts?

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• Custom error handling Asp .Net

  - by lidermin

  Hi, I have a doubt: On my web application, I had configured my web.config file to set customerrors to ON, so here it is: <customErrors mode="On" defaultRedirect="Error.aspx"> <error statusCode="403" redirect="Error.aspx" /> <error statusCode="404" redirect="Error.aspx" /> </customErrors> For explaining propouses I only captured the 403 and 404 error (and the defaultRedirect obviouly). But I would like to get more details of the error on the page: Error.aspx somehow; but not creating each page for each kind of error. Is there a way to include certain code on my error page (Error.aspx) to get the detail of what raised that error?. Hope myself clear. Thanks PD. I'm using C#.

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• Custom error handling Asp .Net

  - by lidermin

  Hi, I have a doubt: On my web application, I had configured my web.config file to set customerrors to ON, so here it is: <customErrors mode="On" defaultRedirect="Error.aspx"> <error statusCode="403" redirect="Error.aspx" /> <error statusCode="404" redirect="Error.aspx" /> </customErrors> For explaining propouses I only captured the 403 and 404 error (and the defaultRedirect obviouly). But I would like to get more details of the error on the page: Error.aspx somehow; but not creating each page for each kind of error. Is there a way to include certain code on my error page (Error.aspx) to get the detail of what raised that error?. Hope myself clear. Thanks PD. I'm using C#.

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• Stubbing ActiveRecord result arrays

  - by Matthias

  Using Ruby 1.8.6, stubbing a finder method to return an Array does not work when the code under test calls the 'count' method on the result: User.any_instance.stubs(:friends).returns([user1, user2]) That's because Array.count has only been added in Ruby 1.8.7. Rails also adds a count method dynamically, I believe through the ActiveRecord::Calculations module. Is there any way to turn this result array into something that behaves exactly as the special Array kind returned by a Rails finder method? When paginating results, it's easy: I can simply call [].paginate. But that doesn't work with normal finder results. I tried [].extend(ActiveRecord::Calculations) but that doesn't work either.

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• Does this schema sound better suited for a document-oriented data store or relational?

  - by Blaine LaFreniere

  Disclaimer: let me know if this question is better suited for serverfault.com I want to store information on music, specifically: genres artists albums songs This information will be used in a web application, and I want people to be able to see all of the songs associated to an album, and albums associated to an artist, and artists associated to a genre. I'm currently using MySQL, but before I make a decision to switch I want to know: How easy is scaling horizontally? Is it easier to manage than an SQL based solution? Would the above data I want to store be too hard to do schema-free? When I think association, I immediately think RDBMSs; can data be stored in something like CouchDB but still have some kind of association as stated above?

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• Are jQuery and GWT comparable frameworks?

  - by lomaxx

  At work there's a bit of discussion around what client side framework we should use for our front end web applications. Currently it's a showdown between GWT and jQuery and I'm kind of on the fence but leaning towards jQuery. From what I can tell, GWT and jQuery are trying to solve different problems but are compared to each other because they both end up existing in the web applications space. I suspect that if this is the case, then comparing the two may be fruitless so what I'm trying to get my head around is if comparing jQuery to GWT is even an apples to apples comparison in the same way that jQuery and ExtJS can be compared, or would it be more beneficial for our team to ask certain questions of our application and use the answers to determine which framework is a better fit for us?

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