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• Is there any way to code breakpoints/debugging?

  - by froadie

  I've been wondering this for a while - is there a way to code/program breakpoints...? Conditionally? For example, can I specify something like - "when this variable becomes this value, break and open the debugger"? (Would be quite useful, especially in long loops when you want to debug loop execution of a late loop value.) I suppose this may be IDE-specific since debugging is implemented differently in different IDEs... I'd be interested to know how to do this in any IDE, but specifically in Eclipse and Visual Studio.

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• Deleting objects through foreign key relationship with T-SQL query

  - by LaserBeak

  Looking for a way to write the following LinQ to entities query as a T-SQL statement. repository.ProductShells.Where(x => x.ShellMembers.Any(sm => sm.ProductID == pid)).ToList().ForEach(x => repository.ProductShells.Remove(x)); The below is obviously not correct but I need it to delete respective ProductShell object where any ShellMember contains a ProductID equal to the passed in variable pid. I would presume this would involve a join statement to get the relevant ShellMembers. repository.Database.ExecuteSqlCommand("FROM Shellmembers WHERE ProductID={0} DELETE FK_ProductShell", pid); I have cascade delete enabled for the FK_ShellMembers_ProductShells foreign key, so when I delete the ProductShell it will delete all the ShellMembers that are associated with it. I am going to pass this statement to System.Data.Entity Database.ExecuteSqlCommand method.

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• Find out 20th, 30th, nth prime number. (I'm getting 20th but not 30th?) [Python]

  - by gsin

  The question is to find the 1000th prime number. I wrote the following python code for this. The problem is, I get the right answer for the 10th , 20th prime but after that each increment of 10 leaves me one off the mark. I can't catch the bug here :( count=1 #to keep count of prime numbers primes=() #tuple to hold primes candidate=3 #variable to test for primes while count<20: for x in range(2,candidate): if candidate%x==0: candidate=candidate+2 else : pass primes=primes+(candidate,) candidate=candidate+2 count=count+1 print primes print "20th prime is ", primes[-1] In case you're wondering, count is initialised as 1 because I am not testing for 2 as a prime number(I'm starting from 3) and candidate is being incremented by 2 because only odd numbers can be prime numbers. I know there are other ways of solving this problem, such as the prime number theorem but I wanna know what's wrong with this approach. Also if there are any optimisations you have in mind, please suggest. Thank You

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• Search object array for matching possible multiple values using different comparison operators

  - by Sparkles

  I have a function to search an array of objects for a matching value using the eq operator, like so: sub find { my ( $self, %params ) = @_; my @entries = @{ $self->{_entries} }; if ( $params{filename} ) { @entries = grep { $_->filename eq $params{filename} } @entries; } if ( $params{date} ) { @entries = grep { $_->date eq $params{date} } @entries; } if ( $params{title} ) { @entries = grep { $_->title eq $params{title} } @entries; } .... I wanted to also be able to pass in a qr quoted variable to use in the comparison instead but the only way I can think of separating the comparisons is using an if/else block, like so: if (lc ref($params{whatever}) eq 'regexp') { #use =~ } else { #use eq } Is there a shorter way of doing it? Because of reasons beyond my control I'm using Perl 5.8.8 so I can't use the smart match operator. TIA

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• How to calculate real-time stats?

  - by Diego Jancic

  I have a site with millions of users (well, actually it doesn't have any yet, but let's imagine), and I want to calculate some stats like "log-ins in the past hour". The problem is similar to the one described here: http://highscalability.com/blog/2008/4/19/how-to-build-a-real-time-analytics-system.html The simplest approach would be to do a select like this: select count(distinct user_id) from logs where date>='20120601 1200' and date <='20120601 1300' (of course other conditions could apply for the stats, like log-ins per country) Of course this would be really slow, mainly if it has millions (or even thousands) of rows, and I want to query this every time a page is displayed. How would you summarize the data? What should go to the (mem)cache? EDIT: I'm looking for a way to de-normalize the data, or to keep the cache up-to-date. For example I could increment an in-memory variable every time someone logs in, but that would help to know the total amount of logins, not the "logins in the last hour". Hope it's more clear now.

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• How do I redirect output from the Visual Studio debugger?

  - by jeatsy

  In Visual Studio 2008, I can specify a message to be printed when a breakpoint is hit (by right-clicking the breakpoint and choosing 'When Hit...'). When the program is run, these messages appear in the Output Window. I would like to know, is there any way to redirect them to a file? Specifying file.txt as a command argument to the program does not work: this redirects the program's output, but not the debugger's. (FWIW the behaviour I wish to achieve is to get the debugger to repeatedly print a variable's value to a file, rather than peppering my code with printf/cout statements.)

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• INSERT INTO temporary table from sp_executsql

  - by gotqn

  Generally, I am bulding dynamic SQL statement that is executing using sp_executsql like this: EXEC sp_executesql @TempSQLStatement I need to insert the return result row set in something (table variable or temporary table), but I am getting the following error: Msg 208, Level 16, State 0, Line 1746 Invalid object name '#TempTable'. after executing this: INSERT INTO #TempTable EXEC sp_executesql @TempSQLStatement From what I have read, I believe the issue is caused because I am not specifying the columns of the temporary table, but I am not able to do this because the return columns count varies. I have read that I can use global temporary tables, but I have done this before and wonder is there an other way to do that.

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• Can't Use Path in ASP MVC Action

  - by user1477388

  I am trying to use Path() but it has a blue line under it and says, "local variable (path) cannot be referred to until it is declared." How can I use Path()? Imports System.Globalization Imports System.IO Public Class MessageController Inherits System.Web.Mvc.Controller <EmployeeAuthorize()> <HttpPost()> Function SendReply(ByVal id As Integer, ByVal message As String, ByVal files As IEnumerable(Of HttpPostedFileBase)) As JsonResult ' upload files For Each i In files If (i.ContentLength > 0) Then Dim fileName = path.GetFileName(i.FileName) Dim path = path.Combine(Server.MapPath("~/App_Data/uploads"), fileName) i.SaveAs(path) End If Next End Function End Class

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• .NET Application using a native DLL (build management)

  - by moogs

  I have a .NET app that is dependent on a native DLL. I have the .NET app set as AnyCPU. In the post-build step, I plan to copy the correct native DLL from some directory (x86 or AMD64) and place it in the target path. However, this doesn't work. On a 64-bit machine, the environment variable PROCESSOR_ARCHITECTURE is "x86" in Visual Studio. My alternative right now is to create a small tool that outputs the processor architecture. This will be used by the post-build step. Is there a better alternative? (Side Note: when deploying/packaging the app, the right native DLL is copied to the right platform. But this means we have two separate release folders for x86 and AMD64, which is OK since this is for a device driver. The app is a utility tool for the driver).

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• Unable to install Maven: "JAVA_HOME is set to an invalid directory"

  - by hello_world_infinity

  I followed the Maven tutorial to the letter but I still can't get Maven installed. When I run the following in command prompt: E:\Documents and Settings\zach>mvn --version I get: 'mvn' is not recognized as an internal or external command, operable program or batch file. I navigated to the maven install folder and ran mvn --version and got: E:\java resources\apache-maven-2.2.0\bin>mvn --version ERROR: JAVA_HOME is set to an invalid directory. JAVA_HOME = "E:\Sun\SDK\jdk\bin" Please set the JAVA_HOME variable in your environment to match the location of your Java installation but when I run java -version I get: java version "1.6.0_14" Java(TM) SE Runtime Environment (build 1.6.0_14-b08) Java HotSpot(TM) Client VM (build 14.0-b16, mixed mode) So I do have Java installed. Anyone know what the problem is?

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• MATLAB fill area between lines

  - by dustynrobots

  I'm trying to do something similar to what's outlined in this post: MATLAB, Filling in the area between two sets of data, lines in one figure but running into a roadblock. I'm trying to shade the area of a graph that represents the mean +/- standard deviation. The variable definitions are a bit complicated but it boils down to this code, and when plotted without shading, I get the screenshot below: x = linspace(0, 100, 101)'; mean = torqueRnormMean(:,1); meanPlusSTD = torqueRnormMean(:,1) + torqueRnormStd(:,1); meanMinusSTD = torqueRnormMean(:,1) - torqueRnormStd(:,1); plot(x, mean, 'k', 'LineWidth', 2) plot(x, meanPlusSTD, 'k--') plot(x, meanMinusSTD, 'k--') But when I try to implement shading just on the lower half of the graph (between mean and meanMinusSTD) by adding the code below, I get a plot that looks like this: fill( [x fliplr(x)], [mean fliplr(meanMinusSTD)], 'y', 'LineStyle','--'); It's obviously not shading the correct area of the graph, and new near-horizontal lines are being created close to 0 that are messing with the shading. Any thoughts? I'm stumped.

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• Compilation error on a user control

  - by MikeP

  I'm stumped! We have a user control for managing account information. We use this particular control on two pages. On one page, everything works perfectly and meets our expectation. On the second page however we receive compilation errors stating that: "C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files\lrpcentral\0e987bea\6719c8b6\App_Web_PageThatFails.aspx.f3d462c1.oi52bvii.0.cs(172): error CS0433: The type 'xxxx_ascx' exists in both 'c:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files\APPLICATIONNAME\0e987bea\6719c8b6\App_Web_xxxx.ascx.cdcab7d2.xbnvt2za.dll' and 'c:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files\APPLICATIONNAME\0e987bea\6719c8b6\App_Web_eix7xllr.dll' My problem is similar to Cyril's but the "delete everything from Temp" is not an option for me, and Cyril's solution does not apply since the only variable we have is contained in the designer file, which is not deployed to our production environment (we pre-compile). After reading David's answer (here) I examined my directories for circular dependency and was unable to find any. Structure: Top Level Page that works Control Directory A Page that causes the error

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• Naming convention in Objective C /C , start with "_"?

  - by Tattat

  Something I see ppl define the variable like this: b2World *_world; b2Body *_body; CCSprite *_ball; instead of b2World *world; b2Body *body; CCSprite *ball; I familiar with the second one, but not the first one. So, I checked the Wikipedia about naming convention: Names beginning with double underscore or an underscore and a capital letter are reserved for implementation (compiler, standard library) and should not be used (e.g. __reserved or _Reserved). So, is that any special meaning which is start with "_"? The wiki page.

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• Read OAuth2.0 Signed_Request Facebook Registration C# MVC

  - by Josh

  My question is very similar this but I guess I need to take it one step further. Facebook says "The data is passed to your application as a signed request. The signed_request parameter is a simple way to make sure that the data you're receiving is the actual data sent by Facebook." After a user has logged into my asp c# MVC site and clicked "Register", the redirect-url is http://site/account/register. At that point (the post to the account/register control), I would like to gather the user's information using the signed request so that I can register them with my site locally. I cannot figure out how to access the data facebook makes available. $data = json_decode(base64_url_decode($payload), true); What is the equivalent in C#? What type of variable/data is facebook passing in the post? And how do I access "$payload"?

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• MVC Implementation PHP Zend PDF generation

  - by zod

  Am using Zend framework and PHP Am going to generate a PDF using Zend . So the View is PDF.There is no PHTML. But if i dont use PHTML in view , is it a perfect MVC? if i want to be a perfect MVC shall i do the db retrieval and variable declaration and assigning in controller and use view and use all pdf functions in view phtml file will it make a perfect MVC? What is the advantage of MVC in this case? :-) can i do the include of zend pdf in phtml file or controller php file? what is the difference ?

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• SWT Filedialog Open into home folder

  - by Ivan

  I want to open a FileDialog window into the user home folder (i.e. /home/user or /Users/unsername) I read the user home folder, using System.getProperty: String homefolder = System.getProperty(user.home); And the variable containts the correct home folder. But when i set the filterpath in FileDialog, it opens (in linux) only the /home level not entering into the user home dir. This is the source code: FileDialog dialog = new FileDialog(shell); dialog.setText("Choose a certificate"); String platform = SWT.getPlatform(); String homefolder = System.getProperty("user.home"); dialog.setFilterPath(homefolder); Any idea? Here a screenshot:

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• How to Ignore certain tags and replace texts in PHP

  - by Aakash Chakravarthy

  Hello, I have a variable like $content = "Lorem Ipsum is simply <b>dummy text of the printing</b> and typesetting industry. Lorem Ipsum has been the industry's <i>standard dummy text</i> ever since the 1500s <string>javascriptFunc();</script>" ; when i use str_replace('a', '', $content); all the 'a's get removed. But the 'a's within the <script> tag should not be removed. or is there any way to replace text other than this method Please help .

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• Alternative design for a synonyms table?

  - by Majid

  I am working on an app which is to suggest alternative words/phrases for input text. I have doubts about what might be a good design for the synonyms table. Design considerations: number of synonyms is variable, i.e. football has one synonym (soccer), but in particular has two (particularly, specifically) if football is a synonym to soccer, the relation exists in the opposite direction as well. our goal is to query a word and find its synonyms we want to keep the table small and make adding new words easy What comes to my mind is a two column design with col a = word and col b = delimited list of synonyms Is there any better alternative? What about using two tables, one for words and the other for relations?

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• IN R counting hierarchical data

  - by Alison

  I have a list of counties in each state that received nonattainment status in years 1995-2005. I want to know how many counties in each state each year that received this status. If my data is formatted like this, State1 Country1 YR1 Yr2 Yr3 Yr4... State1 Country2 YR1 Yr2 Yr3 Yr4 State2 County1 Yr1 Yr2..... Each year variable could have a 1 or a zero, since a county may gain or loose this status in a time period. I need to count each year how many counties in each state have nonattainment status (YRx=1), but can't think of how to do it.

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• conditional operator in C question

  - by Seephor

  I just have a quick question about the conditional operator. Still a budding programmer here. I am given x = 1, y = 2, and z = 3. I want to know, why after this statement: y += x-- ? z++ : --z; That y is 5. The values after the statement are x = 0, y = 5, and z = 4. I know the way the conditional operator works is that it is formatted like this: variable = condition ? value if true : value if false. For the condition, y += x-- , how does y become 5? I can only see 2 (2 += 0) and 3 (2 += 1)(then x-- becomes zero) as possibilities. Any help is much appreciated. :)

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• watchpoint in GDB

  - by Tim

  Hi, If I set a watchpoint for a variable local to the current scope, it will be auto deleted when going out of the scope. Is there any way to set it once and keep it auto alive whenever entering the same scope? Is there anyway to set conditional watchpoint, like "watch var1 if var1==0"? In my case, the condition does't work. gdb stops whenever var1's value is changed, instead of untill "var1==0" is true. My gdb is GNU gdb 6.8-debian. Thanks and regards!

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• Using NSURLRequest+NSURLConnection seems overkill for a webcall with no data return

  - by Spectravideo328

  All, This might seems very straightforward but I have already gone through the URL loading system program guide and the various NSURL.... classes and not found my answer. I am just trying to do a simple call from the app to a website to reserve a party spot: NSString *path=[NSString stringWithFormat:@"http://www.myparty123.com/ireservedURL.asp?Nickname=%@&Seat=%i&Email=%@&Currentparty=%i",john,5432,[email protected],6598]; NSURL* reservationURL =[NSURL URLWithString:path]; NSData *call= [NSData dataWithContentsOfURL:reservationURL]; This seemed to be the simple way but I get this warning that I am not using the "call" variable. And it seems overkill to do a call using NSData where there is no data return. Yet, creating an NSURLRequest and initiating an NSURLConnection and then implementing delegates with that request seems to be overkill as well. What am I missing. Thanks KMB

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• Double Negation in C++ code.

  - by Brian Gianforcaro

  I just came onto a project with a pretty huge code base. I'm mostly dealing with C++ and a lot of the code they write uses double negation for their boolean logic. if (!!variable && (!!api.lookup("some-string"))) { do_some_stuff(); } I know these guys are intelligent programmers, it's obvious they aren't doing this by accident. I'm no seasoned C++ expert, my only guess at why they are doing this is that they want to make absolutely positive that the value being evaluated is the actual boolean representation. So they negate it, then negate that again to get it back to its actual boolean value. Is this a correct? or am I missing something else? Thanks, Brian Gianforcaro

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• How active record is automatically setting up the autoincremental value of ID?

  - by piemesons

  Here this is what we are doing:-- an_order = Order.new an_order.name = "Dave Thomas" an_order.email = "[email protected]" an_order.address = "123 Main St" an_order.pay_type = "check" an_order.save Now it will insert a new row in orders table right. I m having a ID column in that table. Now suppose after inserting this record the value of the ID corresponding to this record is 100. Now how this 100 value came to know? Does the previous value of ID ie 99 (Suppose) is stored somewhere in some variable/file in the ORM layer or before inserting this value a query was fired to know about the last inserted value or database is itself doing that or anything else???

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• How to check whether the form has any ShowDialog() forms open?

  - by kornelijepetak

  I have a form MainForm with several properties/methods that are accessed from another thread. At some point I might open a form AuxForm with ShowDialog() and then while that modal form is open, the other thread still modifies the MainForm's properties. This is all desired. In one of the methods accessed from another thread I need to execute some code, but only if the modal AuxForm is not open. Is there any way to check this (by using .NET WF Form properties) or I need to use a flag variable? NOTE: None of these properties/methods modify the controls (so no Invoke is required).

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