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• Node.js, Cygwin and Socket.io walk into a bar... Node.js throws ENOBUFS and everyone dies...

  - by A Wizard Did It

  I'm hoping someone here can help me out, I'm not having much luck figuring this out myself. I'm running node.js version 0.3.1 on Cygwin. I'm using Connect and Socket.io. I seem to be having some random problems with DNS or something, I haven't quite figured it out. The end result is that I the server is running fine, but when a browser attempts to connect to it the initial HTTP Request works, Socket.io connects, and then the server dies (output below). I don't think it has anything to do with the HTTP request because the server gets a lot data posted to it, and it was receiving requests and responding up until my connection that killed it. I've googled around and the closest thing I've found is DNS being set improperly. It's a network program meant to run only on an internal network, so I've set the nameserver x.x.x.x in my /etc/resolv.conf to the internal DNS. I've also added nameserver 8.8.8.8 in addition. I'm not sure what else to check, but would be grateful of any help. In node.exe.stackdump Exception: STATUS_ACCESS_VIOLATION at eip=610C51B9 eax=00000000 ebx=00000001 ecx=00000000 edx=00000308 esi=00000000 edi=010FCCB0 ebp=010FCAEC esp=010FCAC4 program=\\?\E:\cygwin\usr\local\bin\node.exe, pid 3296, thread unknown (0xBEC) cs=0023 ds=002B es=002B fs=0053 gs=002B ss=002B Stack trace: Frame Function Args 010FCAEC 610C51B9 (00000000, 00000000, 00000000, 00000000) 010FCBFC 610C5B55 (00000000, 00000000, 00000000, 00000000) 010FCCBC 610C693A (FFFFFFFF, FFFFFFFF, 750334F3, FFFFFFFE) 010FCD0C 61027CB2 (00000002, F4B994D5, 010FCE64, 00000002) 010FCD98 76306B59 (00000002, 010FCDD4, 763069A4, 00000002) End of stack trace Node Output: node.js:50 throw e; // process.nextTick error, or 'error' event on first tick ^ Error: ENOBUFS, No buffer space available at doConnect (net.js:642:19) at net.js:803:9 at dns.js:166:30 at IOWatcher.callback (dns.js:48:15) EDIT I'm hitting an LDAP server using http.createClient immediately after a client connects to get information, and that seems to be where the problem is that is causing ENOBUFS. I've edited the source to include && errno != ENOBUFS which now prevents the server from dying, however now the LDAP request isn't working. I'm not sure what the problem is that would cause that though. As I mentioned this is an internal only application, so I set the DNS servers in /etc/resolv.conf to the DNS servers that are being applied to the host machine. Not sure if this is part of the issue? EDIT 2 Here's some output from gdb --args ./node_g --debug ../myscript.js. I'm not sure if this is related to ENOBUFS, however, as it seems to be disconnecting immediately after connection with Socket.io [New thread 672.0x100] Error: dll starting at 0x76e30000 not found. Error: dll starting at 0x76250000 not found. Error: dll starting at 0x76e30000 not found. Error: dll starting at 0x76f50000 not found. [New thread 672.0xc90] [New thread 672.0x448] debugger listening on port 5858 [New thread 672.0xbf4] 14 Jan 18:48:57 - socket.io ready - accepting connections [New thread 672.0xed4] [New thread 672.0xd68] [New thread 672.0x1244] [New thread 672.0xf14] 14 Jan 18:49:02 - Initializing client with transport "websocket" assertion "b[1] == 0" failed: file "../src/node.cc", line 933, function: ssize_t node::DecodeWrite(char*, size_t, v8::Handle<v8::Value>, node::encoding) Program received signal SIGABRT, Aborted. 0x7724f861 in ntdll!RtlUpdateClonedSRWLock () from /cygdrive/c/Windows/system32/ntdll.dll (gdb) backtrace #0 0x7724f861 in ntdll!RtlUpdateClonedSRWLock () from /cygdrive/c/Windows/system32/ntdll.dll #1 0x7724f861 in ntdll!RtlUpdateClonedSRWLock () from /cygdrive/c/Windows/system32/ntdll.dll #2 0x75030816 in WaitForSingleObjectEx () from /cygdrive/c/Windows/syswow64/KernelBase.dll #3 0x0000035c in ?? () #4 0x00000000 in ?? () (gdb)

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• How do I unset an element in an array in javascript?

  - by Steven Noble

  How do I remove the key 'bar' from an array foo so that 'bar' won't show up in for(key in foo){alert(key);}

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• C# newbie List<Interface> question

  - by newB

  If you have an Interface IFoo and a class Bar : IFoo, why can you do the following: List<IFoo> foo = new List<IFoo>(); foo.Add(new Bar()); But you cannot do: List<IFoo> foo = new List<Bar>();

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• Breadcrumbs in Fusebox 4/5

  - by Jordan Reiter

  I'm wondering if anyone has come up with a clean way to generate a breadcrumbs trail in Fusebox. Specifically, is there a way of keeping track of "where you are" and having that somehow generate the breadcrumbs for you? So, for example, if you're executing /index.cfm?fuseaction=Widgets.ViewWidget&widget=1 and the circuit structure is something like /foo/bar/widgets/ then somehow the system automatically creates an array like: [ { title: 'Foo', url: '#self#?fuseaction=Foo.Main' }, { title: 'Bar', url: '#self#?fuseaction=Bar.Main' }, { title: 'Widgets', url: '#self#?fuseaction=Widgets.Main' }, { title: 'Awesome Widget', url: '' } ] Which can then be rendered as Foo Bar Widgets Awesome Widget Right now it seems the only way to really do this is to create the structure for each fuseaction in a fuse of some kind (either the display fuse or a fuse dedicated to creating the crumbtrail).

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• How to Remove Last digit of String in C#.net?

  - by Crimsonland

  I want to eliminate B if i scan Serial number bar code: 21524116476CA2006765B Output: 21524116476CA2006765

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• How to specify the left, right, or title View button in XIB

  - by Sharen Eayrs

  I do not want to create a custom navigation bar. I am pushing a UIViewController and I want to customize how the navigation bar looks for that UIViewController In story board, we just specify the segue and a nav bar show up on the screen. We just drag and drop UIBarItem to the left and right. In XIB, the navigationBar simply doesn't show up. I can add navigation Item but the one I added is ignored. I've heard that there used to be an outlet called navigationItem but it's deprecated for reason I do not know. I can add UINavigationBar, however that would be adding my own custom bar. I want the navBar that's provided by UINavigationController.

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• How to retrieve row count of one-to-many relation while also include original entity?

  - by kaa

  Say I have two entities Foo and Bar where Foo has-many Bar's, class Foo { int ImportantNumber { get; set; } IEnumerable<Bar> Bars { get; set; } } class FooDTO { Foo Foo { get; set; } int BarCount { get; set; } } How can I efficiently sum up the number of Bars per Foo in a DTO using a single query, preferrably only with the Criteria interface. I have tried any number of ways to get the original entity out of a query with ´SetProjection´ but no luck. The current theory is to do something like SELECT Foo.*, BarCounts.counts FROM Foo LEFT JOIN ( SELECT fooId, COUNT(*) as counts FROM Bar GROUP BY fooId ) AS BarCounts ON Foo.id=BarCounts.fooId but with Criterias, and I just can't seem to figure out how.

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• External URL re direction issue IN Rails 2

  - by Rcoder

  I have a requirement where in I want to redirect to an external Url Here is my code in routes.rb map.connect "/myapp/:someparam" , :controller = "foocontroller" , :action = "redirect_to_external_url" In my foo controller i have this action def redirect_to_external_url redirect_to "http://externalurl.com/#{params[:someparam]}.html" end which will redirect to the external url The problem That I am facing is After redirecting, The browser shows "http://externalurl.com/bar.html whereas I want the browser to show "/myapp/bar" url (ex http://mydomain.com/myapp/bar) for seo purpose. Any idea on how this can be achieved in rails ? The Rails version that I am using is 2.3.4

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• How to implement this UI

  - by Michael

  Just curious if the tab bar UI element in screenshots is some built in class or customized. If it is customized, then please give me a hint on what classes I might check to have something like that. The first screenshot is initial tab bar. When I tap on the last icon the tab bar smoothly(animated) resize itself as on second screenshot. If I press the edit button the icons are shaking(as on iPhone home) and I'm able to arrange them. first second

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• How to extract terms of specific data constructor from a list in Haskell

  - by finnsson

  A common problem I got in Haskell is to extract all terms in a list belonging to a specific data constructor and I'm wondering if there are any better ways than the way I'm doing it at the moment. Let's say you got data Foo = Bar | Goo , the list foos = [Bar, Goo, Bar, Bar, Goo] and wish to extract all Goos from foos. At the moment I usually do something like goos = [Goo | Goo <- foos] and all is well. The problem is when Goo got a bunch of fields and I'm forced to write something like goos = [Goo a b c d e f | Goo a b c d e f <- foos] which is far from ideal. How you do usually handle this problem?

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• Multiple grids in one area

  - by anon

  I'm currently creating a WPF application, using C# and XAML in Visual Studios 2010. I have a master grid. In that master grid I have a group bar which you can select different items. Depending on what you select, the middle of the master grid can be totally different. What I was wondering is, what's the best way to program the middle part? Right now, I have it set up in such a way that everything in the middle is dynamically programed in C#, and everything on the outside is programmed in XAML. In C# I programmed: for each group bar item, there is a grid that goes with it (so that different content can be displayed on it). Each grid is a child of the master grid. Each grid is visible or hidden when necessary. Is this the best way to approach this? The best example of this is in Outlook 2007, where you have your group bar on the right hand side. When you select different items on the group bar (mail, calendar, tasks) the right of the group bar completely changes.

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• Dynamically changing validations in Rails

  - by user94154

  I have a model with a validation. At runtime, I'd like to change a value of the validation. For example: in the model bid.rb: class Bid ActiveRecord::Base @foo = Foo.find(1) validates_inclusion_of :amt, :in => 1..@foo.bar, :message => "must be between 1 and #{@foo.bar}" end and in the application_controller (pseudocode): if today == 'wednesday' Foo.update(1, :bar => 10) else Foo.update(1, :bar => 5) end However, this setup isn't working. The "foo" attribute never updates. It seems that the validation code is set only when the dev server starts and then doesn't change.

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• Python interpreter invocation with "-c" and indentation issues

  - by alexander

  I'm trying to invoke Python using the "-c" argument to allow me to run some arbitrary python code easily, like this: python.exe -c "for idx in range(10): print idx" Now this code works fine, from within my batch file, however, I'm running into problems when I want to do anything more than this. Consider the following Python code: foo = 'bar' for idx in range(10): print idx this would then give you 0-9 on the stdout. However, if I collapse this into a single line, using semicolons as delimiters, to get the following: foo = 'bar';for idx in range(10): print idx and try to run it using python.exe -c it get a SyntaxError raised: C:\Python>python.exe -c "foo = 'bar';for idx in range(10): print idx" File "<string>", line 1 foo = 'bar';for idx in range(10): print idx ^ SyntaxError: invalid syntax Anyone know how I can actually use this without switching to a separate .py file?

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• How do I avoid boxing/unboxing when extending System.Object?

  - by Robert H.

  I'm working on an extension method that's only applicable to reference types. I think, however, it's currently boxing and unboxing the the value. How can I avoid this? namespace System { public static class SystemExtensions { public static TResult GetOrDefaultIfNull<T, TResult>(this T obj, Func<T, TResult> getValue, TResult defaultValue) { if (obj == null) return defaultValue; return getValue(obj); } } } Example usage: public class Foo { public int Bar { get; set; } } In some method: Foo aFooObject = new Foo { Bar = 1 }; Foo nullReference = null; Console.WriteLine(aFooObject.GetOrDefaultIfNull((o) => o.Bar, 0)); // results: 1 Console.WriteLine(nullReference.GetOrDefaultIfNull((o) => o.Bar, 0)); // results: 0

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• How can I prevent a view from covering my tab controller in my tab based application?

  - by helloJello

  I have an application with a Tab Bar Controller that has three tabs. In tab 1 there is a view (view1) with a button that when clicked transitions the user to a new view (view2) still within tab 1. However when this new view (view2) is loaded it covers my tab bar controller. What is the best approach for me to take to still display tab bar controller as well as keep tab 1 highlighted?

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• C++ Constructor Initializer List - using member functions of initialized members

  - by Andy

  I've run into the following a few times with initializer lists and I've never been able to explain it well. Can anyone explain why exactly the following fails (I don't have a compiler to catch typos, so bear with me): class Foo { public: Foo( int i ) : m_i( i ) {} //works with no problem int getInt() {return m_i;} ~Foo {} private: int m_i; }; class Bar { public: Bar() : m_foo( 5 ), //this is ok m_myInt( m_foo.getInt() ) //runtime error, seg 11 {} ~Bar() {} private: Foo m_foo; int m_myInt; }; When trying to call member functions of members initialized higher up the initializer list, I get seg faults. I seem to recall this is a known problem (or perhaps somehow by design) but I've never seen it well described. The attached example is contrived with plain old data types, but substitute the Bar::m_myInt with another object lacking a default (empty) constructor and the issue is more real. Can anyone enlighten me? Thanks!

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• Using RegEx to Identify parts of a Database Connection String

  - by David_Jarrett

  I'm trying to get to grips with regular expressions: I have a database connection string and I'd like to use a regular expression to identify specific Keys and Values within it. For example server=foo;database=bar;uid=foo;pwd=bar I'd like something to return "database=bar;" using the 'database' key to identify it, ideally it would be case insensitive. I can do this using normal code, but I think that this is exactly the sort of thing for which regular expressions were designed.

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• What is the 'noreq' Filter Type an Alias for?

  - by Alan Storm

  I'm looking in to Magento's filtering options (Ecommerce System and PHP Framekwork with an expansive ORM system). Specifically the addFieldToFilter method. In this method, you specify a SQLish filter by passing in a single element array, with the key indicating the type of filter. For example, array('eq'=>'bar') //eq means equal array('neq'=>'bar') //neq means not equal would each give you a where clause that looks like where field = 'bar'; where field != 'bar'; So, deep in the bowels of the source, I found a comparison type named 'moreq' that maps to a = comparison operator array('moreq'=>'27') where field >= 27 The weird thing is, there's already a 'gteq' comparision type array('gteq'=>'27') where field >= 27 So, my question is, what does moreq stand for? Is is some special SQL concept that's supported in other databases that the Magento guys wants to map to MySQL, or is it just "more required" and an example what happens when you're doing rapid agile and trying to maintain backwards compatibility.

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• How to define type member constant in F# ?

  - by zproxy

  In C# one can define a type member constant like this: class Foo { public const int Bar = 600; } The IL shall looks like this. .field public static literal int32 Bar = int32(600) How can I do the same within Visual F# / FSharp? I tried this to no avail: [<Sealed>] type Foo() = [<Literal>] let Bar = 600

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• any equivalent to VB.net function name as return value in C#?

  - by user1179861

  In vb.net there is a weird approach that you can use the function name as the result variable.. example: Function Foo(ByVal bar As Integer) As List(Of Integer) Foo = New List(Of Integer) Foo.Add(bar + 1) End Function As far as i know, in C# you have to: List<int> foo(int bar) { var result = new List<int>(); result.Add(bar + 1); return result; } I'm not sure if it's by design or i just don't know the right way to do this.. Please enlight me! Thanks in advance, Eitan.

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• set highchart margin

  - by user1392330

  I have built a a higcharts charts and I am displaying them one at a time on mouseover. The jquery creates a floting div (depending on the cursor) with a border line 1px solid black and then the highchart method is being called to draw the chart. The thing is that highcharts exceed and left and bottom border is not shown. I tired 'margin' : chart: { renderTo: 'graph', defaultSeriesType: 'line', zoomType: 'x', margin: [ 10, 10, 10, 10] }, and still it does the same thing.

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• mod_rewrite: remove trailing slash (only one!)

  - by tshabalala

  Hello. I use mod_rewrite/.htaccess for pretty URLs. I'm using this condition/rule to eliminate trailing slashes (or rather: rewrite to the non-trailing-slash-URL, by a 301 redirect; I'm doing this to avoid duplicate content and because I like URLs with no trailing slashes better): RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d RewriteCond %{HTTP_HOST} !^\.localhost$ [NC] RewriteRule ^(.+)/$ http://%{HTTP_HOST}/$1 [R=301,L] Working well so far. Only drawback: it also forwards "multiple-trailing-slash"-URLs to non-trailing-slash-URLs. Example: http://example.tld/foo/bar////// forwards to http://example.tld/foo/bar while I only want http://example.tld/foo/bar/ to forward to http://example.tld/foo/bar. So, is it possible to only eliminate trailing slashes if it's actually just one trailing slash? Sorry if this is a somewhat annoying or weird question! Thanks.

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• Optimizing simple search script in PowerShell

  - by cc0

  I need to create a script to search through just below a million files of text, code, etc. to find matches and then output all hits on a particular string pattern to a CSV file. So far I made this; $location = 'C:\Work*' $arr = "foo", "bar" #Where "foo" and "bar" are string patterns I want to search for (separately) for($i=0;$i -lt $arr.length; $i++) { Get-ChildItem $location -recurse | select-string -pattern $($arr[$i]) | select-object Path | Export-Csv "C:\Work\Results\$($arr[$i]).txt" } This returns to me a CSV file named "foo.txt" with a list of all files with the word "foo" in it, and a file named "bar.txt" with a list of all files containing the word "bar". Is there any way anyone can think of to optimize this script to make it work faster? Or ideas on how to make an entirely different, but equivalent script that just works faster? All input appreciated!

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• Test param value using EasyMock

  - by fmpdmb

  I'm attempting to write some unit tests using EasyMock and TestNG and have run into a question. Given the following: void execute(Foo f) { Bar b = new Bar() b.setId(123); f.setBar(b); } I'm trying to test that the Id of the Bar gets set accordingly in the following fashion: @Test void test_execute() { Foo f = EasyMock.createMock(Foo.class); execute(f); Bar b = ?; // not sure what to do here f.setBar(b); f.expectLastCall(); } In my test, I can't just call f.getBar() and inspect it's Id because f is a mock object. Any thoughts? Is this where I'd want to look at the EasyMock v2.5 additions andDelegateTo() and andStubDelegateTo()?

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• foo and _foo - about variables inside a class

  - by kame

  class ClassName(object): """ """ def __init__(self, foo, bar): """ """ self.foo = foo # read-write property self.bar = bar # simple attribute def _set_foo(self, value): self._foo = value def _get_foo(self): return self._foo foo = property(_get_foo, _set_foo) a = ClassName(1,2) #a._set_foo(3) print a._get_foo() When I print a._get_foo() the function _get_foo prints the variable self._foo . But where does it come from? self._foo and self.foo are different, aren't they?

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