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• LINQ Quicksort is Unstable Except When Cascading

  - by Mystagogue

  On page 64 of "LINQ To Objects Using C# 4.0" (Tony Magennis) he states that LINQ's quicksort ordering algorithm is unstable... ...although this is simply solved by cascading the result into a ThenBy or ThenByDescending operator. Huh? Why would cascading an unstable sortation into another sortation fix the result? In fact, I'd say that isn't possible. The original order, once passed through an unstable sort, is simply lost. What am I missing here?

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• LINQ query and lambda expressions

  - by user329269

  I'm trying to write a LINQ query and am having problems. I'm not sure if lambda expressions are the answer or not but I think they may be. I have two combo boxes on my form: "State" and "Color". I want to select Widgets from my database based on the values of these two dropdowns. My widgets can be in one of the following states: Not Started, In Production, In Finishing, In Inventory, Sold. Widgets can have any color in the 'color' table in the database. The 'state' combobox has selections "Not Sold," "In Production/Finishing", "Not Started," "In Production," "In Finishing," "In Inventory," "Sold." (I hope these are self-explanatory.) The 'color' dropdown has "All Colors," and a separate item for each color in the database. How can I create a LINQ query to select the widgets I want from the database based on the dropdowns?

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• Different NSTimeZone names being returned

  - by Michael Waterfall

  I've noticed that on some devices the NSTimeZone's name method for a particular timezone can return different values. When testing the Brisbane time zone, my device returns @"Australia/Brisbane" whereas another user's device returns "Etc/GMT-10". Both iPhone's are running 3.1.2. The Date and Time Programming Guide for Cocoa states that: timeZoneWithName: The name passed to this method may be in any of the formats understood by the system, for example EST, Etc/GMT-2, America/Argentina/Buenos_Aires, Europe/Monaco, or US/Pacific, as shown in the following code fragment. I'd just like to know what could determine which value is used? The device? The language?

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• Is there a service for monitoring secured WCF endpoints in the same way that HTTP monitoring service

  - by Ryan ONeill

  Hi all, A service I have in WCF occasionally goes down due a problem with a COM component. While I am troubleshooting I would like to setup another host to make regular calls to this service to monitor availability. It is slightly more complicated that a simple HTTP call though as the service is secured by SSL and WCF authentication (username / password). I'd also like to be able to parse successful calls to see if they return warning / fail states from my code. Would you recommend any monitoring providers for this or is it beyond the simple monitoring they normally provide? Regards Ryan

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• What is the maximum length in seconds to store a value in memcache

  - by Emilien

  The Google App Engine memcache documentation states that the time parameter of memcache.set() is an "Optional expiration time, either relative number of seconds from current time (up to 1 month), or an absolute Unix epoch time." So I tried to set a value for 30 days, which according to Google is 2 592 000 seconds. However, I highly suspect that this value is too high, because the value was set (memcache.set() returned the value True), but a memcache.get() just after always returned None. Reducing this value to 1 728 000 seconds just worked fine/as expected. I guess that once passed the highest value, the time parameter gets interpreted as an absolute Unix epoch time. That would mean that 2 592 000 seconds got interpreted as "Sat, 31 Jan 1970 00:00:00 GMT", which is obviously a date in the past... So what is the highest value you can enter that will get interpreted as a number of seconds in the future?

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• Program contains 2 nested loops which contain 4 if conditionals. How many paths?

  - by Student4Life

  In Roger Pressman's book, there is an example described of a program with 2 nested loops, the inner loop enclosing four if statements. The two loops can execute up to 20 times. He states that this makes about 10^14 paths. To get a number this large, it seems the paths inside the loops are multipllied by 2^40, i.e. 2^20 times 2^20 to account for all the possibilities of going through the two loops. I can't see why this factor is not just 400, i.e. 20 times 20. Can someone shed some light? It will help if you have the ppt slides and can see the program graph. Thanks.

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• WinDbg can't find mfc90 version 9.0.30729.4148 symbols on msdl.microsoft.com

  - by Simon Hofverberg

  I think the title states my problem fairly well. Where are those mfc symbols? Some background info: I have a crash dump that I want to analyze in WinDbg. My symbol path contains msdl.microsoft.com/download/symbols (and it says h t t p first but I'm a new user here so I'm not allowed to write that twice. The 9.0.30729.4148 version seems to be installed by some Windows update When a dump contains an earlier version of mfc90, it is located by WinDbg on the Microsoft symbol server with the same settings. When I use !sym noisy, the output for mfc90.dll contains: SYMSRV: http://msdl.microsoft.com/download/symbols/mfc90.dll/4A596D4939c000/mfc90.dll not found The same thing happens on two different computers Edit: See my comments below. The symbols are present on the server, but WinDbg can't get them.

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• How to tell if any entities in context are dirty with .Net Entity Framework 4.0

  - by Mike Gates

  I want to be able to tell if there is any unsaved data in an entity framework context. I have figured out how to use the ObjectStateManager to check the states of existing entities, but there are two issues I have with this. I would prefer a single function to call to see if any entities are unsaved instead of looping though all entities in the context. I can't figure out how to detect entities I have added. This suggests to me that I do not fully understand how the entity context works. For example, if I have the ObjectSet myContext.Employees, and I add a new employee to this set (with .AddObject), I do not see the new entity when I look at the ObjectSet and I also don't see the .Count increase. However, when I do a context.SaveChanges(), my new entity is persisted...huh? I have been unable to find an answer to this in my msdn searches, so I was hoping someone here would be able to clue me in. Thanks in advance.

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• Can't set anchor tag to [disabled] in IE

  - by Alex

  Hi. I have the following css code. button.png is image where 3 button states are pasted vetrically, so i just move image in css. a.button { background-image: url(button.png); background-position: 0px 0px; width: 100px; height: 30px; display: block; background-repeat: no-repeat; text-indent: -9999px; } a:hover.button { background-position: -100px 0px; } a.button[disabled] { background-position: -200px 0px; cursor:default; } I put this in html <a href="#" class="button" disabled="disabled"></a> In Chrome all is ok. IE dont show disabled image.

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• Difference between 'scope' and 'namespace'?

  - by katriel

  What is the difference, in general, between the concepts of namespaces and scope? To my understanding, both describe the parts of a program in which a variable/object/method/function will be accessible. I understand that 'scope' tends to be a property of the variable (e.g., "This variable has global scope"), while a 'namespace' is a property of the program (e.g., "A Python function creates a local namespace"). Are there other differences? Global scope vs global namespace addresses a slightly narrower question: global namespaces in C++. http://www.alan-g.me.uk/tutor/tutname.htm states, There are a few very subtle differences between the terms but only a Computer Scientist pedant would argue with you, and for our purposes namespace and scope are identical. What are those subtle differences? Under what circumstances or with which kinds of languages do people use each concept?

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• Create a Models Diagram Using Railroad

  - by SeeBees

  Railroad is a great UML tool for Ruby on Rails. It can automatically generate class diagrams of models and controllers. For models, a railroad-generated class diagram shows attributes of each model and the associations between one model and another. A sample diagram can be found here. It is very useful for a developer to see attributes and associations of models. While attributes and associations reveal the inner states and relationships of models, methods specify their behaviours. They are all desirable in a class diagram. I would like railroad to generate a class diagram that also lists methods for models, which will help me to know what each model does. I know methods are displayed in a diagram that is generated for controllers, but I don't see such an option for a diagram of models. Does someone know how to do that with railroad? Or is that possible? Thanks!

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• Direct3D 11 effect files deprecated?

  - by Toji

  I've been playing around with Direct3D 11 a little bit lately and have been frustrated by the lack of documentation on the basics of the API (such as simple geometry rendering). One of the points of confusion brought on by the sparse documentation is the (apparent) move away from the use of effects for shaders. In D3D11 all of the effect (.fx) support has been removed from the D3DX libraries and buried away in a hard to find (sparsely documented, of course) shared source library. None of the included examples use it, preferring instead to compile HLSL files directly. All of this says to me that Microsoft is trying to get people to stop using the effect file format. Is that true? Is there any documentation of any kind that states that? I'm fine doing it either way, but for years now they've been promoting the .fx format so it seems odd that they would suddenly decide to drop it.

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• Reverse engineering windows mobile live search CellID location awareness protocol (yikes)...

  - by Jean-Charles

  I wasn't sure of how to form the question so I apologize if the title is misleading. Additionally, you may want to get some coffee and take a seat for this one ... It's long. Basically, I'm trying to reverse engineer the protocol used by the Windows Mobile Live Search application to get location based on cellID. Before I go on, I am aware of other open source services (such as OpenCellID) but this is more for the sake of education and a bit for redundancy. According to the packets I captured, a POST request is made to ... mobile.search.live.com/positionlookupservice_1/service.aspx ... with a few specific headers (agent, content-length, etc) and no body. Once this goes through, the server sends back a 100-Continue response. At this point, the application submits this data (I chopped off the packet header): 00 00 00 01 00 00 00 05 55 54 ........UT 46 2d 38 05 65 6e 2d 55 53 05 65 6e 2d 55 53 01 F-8.en-US.en-US. 06 44 65 76 69 63 65 05 64 75 6d 6d 79 01 06 02 .Device.dummy... 50 4c 08 0e 52 65 76 65 72 73 65 47 65 6f 63 6f PL..ReverseGeoco 64 65 01 07 0b 47 50 53 43 68 69 70 49 6e 66 6f de...GPSChipInfo 01 20 06 09 43 65 6c 6c 54 6f 77 65 72 06 03 43 . ..CellTower..C 47 49 08 03 4d 43 43 b6 02 07 03 4d 4e 43 03 34 GI..MCC....MNC.4 31 30 08 03 4c 41 43 cf 36 08 02 43 49 fd 01 00 10..LAC.6..CI... 00 00 00 ... And receives this in response (packet and HTTP response headers chopped): 00 00 00 01 00 00 00 00 01 06 02 50 4c ...........PL 06 08 4c 6f 63 61 6c 69 74 79 06 08 4c 6f 63 61 ..Locality..Loca 74 69 6f 6e 07 03 4c 61 74 09 34 32 2e 33 37 35 tion..Lat.42.375 36 32 31 07 04 4c 6f 6e 67 0a 2d 37 31 2e 31 35 621..Long.-71.15 38 39 33 38 00 07 06 52 61 64 69 75 73 09 32 30 8938...Radius.20 30 30 2e 30 30 30 30 00 42 07 0c 4c 6f 63 61 6c 00.0000.B..Local 69 74 79 4e 61 6d 65 09 57 61 74 65 72 74 6f 77 ityName.Watertow 6e 07 16 41 64 6d 69 6e 69 73 74 72 61 74 69 76 n..Administrativ 65 41 72 65 61 4e 61 6d 65 0d 4d 61 73 73 61 63 eAreaName.Massac 68 75 73 65 74 74 73 07 10 50 6f 73 74 61 6c 43 husetts..PostalC 6f 64 65 4e 75 6d 62 65 72 05 30 32 34 37 32 07 odeNumber.02472. 0b 43 6f 75 6e 74 72 79 4e 61 6d 65 0d 55 6e 69 .CountryName.Uni 74 65 64 20 53 74 61 74 65 73 00 00 00 ted States... Now, here is what I've determined so far: All strings are prepended with one byte that is the decimal equivalent of their length. There seem to be three different casts that are used throughout the request and response. They show up as one byte before the length byte. I've concluded that the three types map out as follows: 0x06 - parent element (subsequent values are children, closed with 0x00) 0x07 - string 0x08 - int? Based on these determinations, here is what the request and response look like in a more readable manner (values surrounded by brackets denote length and values surrounded by parenthesis denote a cast): \0x00\0x00\0x00\0x01\0x00\0x00\0x00 [5]UTF-8 [5]en-US [5]en-US \0x01 [6]Device [5]dummy \0x01 (6)[2]PL (8)[14]ReverseGeocode\0x01 (7)[11]GPSChipInfo[1]\0x20 (6)[9]CellTower (6)[3]CGI (8)[3]MCC\0xB6\0x02 //310 (7)[3]MNC[3]410 //410 (8)[3]LAC\0xCF\0x36 //6991 (8)[2]CI\0xFD\0x01 //259 \0x00 \0x00 \0x00 \0x00 and.. \0x00\0x00\0x00\0x01\0x00\0x00\0x00 \0x00\0x01 (6)[2]PL (6)[8]Locality (6)[8]Location (7)[3]Lat[9]42.375621 (7)[4]Long[10]-71.158938 \0x00 (7)[6]Radius[9]2000.0000 \0x00 \0x42 //"B" ... Has to do with GSM (7)[12]LocalityName[9]Watertown (7)[22]AdministrativeAreaName[13]Massachusetts (7)[16]PostalCodeNumber[5]02472 (7)[11]CountryName[13]United States \0x00 \0x00\0x00 My analysis seems to work out pretty well except for a few things: The 0x01s throughout confuse me ... At first I thought they were some sort of base level element terminators but I'm not certain. I'm not sure the 7-byte header is, in fact, a seven byte header. I wonder if it's maybe 4 bytes and that the three remaining 0x00s are of some other significance. The trailing 0x00s. Why is it that there is only one on the request but two on the response? The type 8 cast mentioned above ... I can't seem to figure out how those values are being encoded. I added comments to those lines with what the values should correspond to. Any advice on these four points will be greatly appreciated. And yes, these packets were captured in Watertown, MA. :)

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• Python Mersenne Twister implementation

  - by B Rivera

  I have Python 3.1.2 and I'm using Windows XP. Where can I see Python's implementation of the Mersenne Twister? In the Python docs it is stated that the Mersenne Twister was written in C and the Python History and License ( http://docs.python.org/py3k/license.html?highlight=mersenne%20twister ) states that "The _random module includes code based on a download from http://www.math.keio.ac.jp/matumoto/MT2002/emt19937ar.html." random.py imports _random which apparently has the Mersenne Twister implementation in it. I can't seem to locate _random. Any thoughts?

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• How to order a TimeZone list in .NET?

  - by reallyJim

  I have an ASP.NET web application that requires users to select their appropriate time zone so that it can correctly show local times for events. In creating a simple approach for selecting the time zone, I started by just using the values from TimeZoneInfo.GetSystemTimeZones(), and showing that list. The only problem with this is that since our application is primarily targeted at the United States, I'd like to show those entries first, basically starting with Eastern Time and working backwards (West) until I reach Atlantic time. What's a good approach to do this in code?

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• Protect Plesk login page from search engine eyes

  - by Iman Samizadeh

  Hi Folks, I was wondering if would it be possible to protect the "https://www.DOMAIN.com:8443" URL from search engines listing perhaps using the htaccess to redirect the 8443 port from "DOMAIN" to elsewhere? This is the VZPP Plesk - Login Login to Plesk. Please enter your login information. Username. Password. Interface Language. User Default, ENGLISH (United States), GERMAN (Germany) ... https://www.DOMAIN.com:8443/ - Many Thanks.

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• Why will this code compile using ifort compiler and not when using gfortran compiler? Help!

  - by CuriousCompiler

  I'm rewriting some code to make a program compile with the gfortran compiler as opposed to ifort compiler I usually use. The code follows: _Subroutine SlideBits (WORD, BITS, ADDR) Implicit None Integer(4) WORD Integer(4) BITS Integer(4) ADDR Integer(4) ADDR1 ADDR1 = 32 - ADDR WORD = (WORD .And. (.Not.ISHFT(1,ADDR1))) .Or. ISHFT(BITS,ADDR1) End_ When I compile the above code using the gfortran compiler, I recieve this error: WORD = (WORD .And. (.Not.ISHFT(1,ADDR1))) .Or. ISHFT(BITS,ADDR1) Error: Operand of .NOT. operator at (1) is INTEGER(4) All three of the variables coming into the subroutine are integers. I've looked around a bit and the gfortran wiki states that the gfortran compiler should be able to handle logical statments being applied to integer values. Several other sites I've visited either quote from the gnu wiki or agree with it. This is the first time I've seen this error as the Intel Fortran compiler (ifort) I normally use compiles cleanly.

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• How Easy Is It to Hijack Session Vars on GoDaddy (PHP)

  - by yar

  This article states that If your site is run on a shared Web server, be aware that any session variables can easily be viewed by any other users on the same server. On a larger host like GoDaddy, are there really no protections in place against this? Could it really be that easy? If it is that easy, where are the session vars of the other users on my host so I can check them out? Edit: I didn't believe it, but here's my little program which shows that this is true! I wonder if those are really the same as the value stored in the cookies on the users' machine?

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• Is SynchronizationContext.Post() threadsafe?

  - by cyclotis04

  This is a pretty basic question, and I imagine that it is, but I can't find any definitive answer. Is SynchronizationContext.Post() threadsafe? I have a member variable which holds the main thread's context, and _context.Post() is being called from multiple threads. I imagine that Post() could be called simultaneously on the object. Should I do something like lock (_contextLock) _context.Post(myDelegate, myEventArgs); or is that unnecessary? Edit: MSDN states that "Any instance members are not guaranteed to be thread safe." Should I keep my lock(), then?

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• SQLite multi process access

  - by Nicolas

  Hello, We are using SQLite in a multi processes and multi threaded application. The SQLite database files are encrypted using the embedded SQLite encryption. The FAQ states that SQLite should be able to manage multi process accesses using locks mechanism. We are experiencing a strange problem: When many threads are accessing the same database file, sometime constrains violations occur, more specifically - a field with a unique constrain is getting duplicate values after calling "insert or replace" statement. It happens quite often now, that we are using the encryption. Before we started using SQLite encryption we did not notice such a behavior. Are there any specific known issues with this?

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• SQL Server - Storing multiple decimal values in a column?

  - by cshah

  I know storing multiple values in a column. Not a good idea. It violates first normal form --- which states NO multi valued attributes. Normalize period... I am using SQL Server 2005 I have a table that require to store lower limit and uppper limit for a measurement, think of it as a minimum and maximum speed limit... only problem is only 2 % out of hundread i need upper limit. I will only have data for lower limit. I was thinking to store both values in a column (Sparse column introduces in 2008 so not for me) Is there a way...? Not sure about XML..

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• ASMX Still slow after 'Generate serialization assembly'

  - by Buzzer

  This question is related to: http://stackoverflow.com/questions/784918/asmx-web-service-slow-first-request. I inherited a proxy to a legacy ASMX Service. Basically as the post above states, the first call performance is literally 10 times slower than the subsequent calls. I went ahead and turned on ‘Generate serialization assembly' on the project that contains the proxy. The 'serializers' assembly is actually generated. However, I haven't seen any performance increase at all. Do I need to do anything else other than make sure the 'serializers' assembly is in the client's bin directory? Do I have to 'link' the proxy to the 'serializers' assembly during proxy generation (wsdl.exe)? I guess I'm stuck at this point. J Saunders where u at? :)

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• Javascript array - merge two arrays into one

  - by estrar

  I have two arrays, one with name of the country and one with the currency type. I would like to merge these together and use the country key instead of the currencies array. What would be the best way to accomplish this? This is what my code looks like now: var country = new Array(); country["SEK"] = 'Sweden'; country["USD"] = 'United states'; var currencies = ["SEK","USD"]; var options = ''; for (var i = 0; i < currencies.length; i++) { options += '<option value="' + currencies[i] + '" id="' + currencies[i] + '">' + currencies[i] + ' (' + country[currencies[i]] + ')</option>'; }

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• PEP8: conflict between W292 and W391

  - by seler

  As far as I know in unix it's a good practice to always have blank line at the end of file - or to put it in other words: every line should end with \n. While checking my python code with PEP8 I noticed that it also states that there should be \n at end of file: W292 no newline at end of file JCR: The last line should have a newline. What's strange, it conflicts with W391: W391 blank line at end of file JCR: Trailing blank lines are superfluous. Okay: spam(1) W391: spam(1)\n How it should be? Should I have blank line at the end of file or not?

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• Bug when adding a sprite to 1 <s:State>

  - by lostincode

  I'm working within a skin for a button that has some <s:State> normal over In the tag, I'm drawing a circle private var theshape:Sprite; private function drawShape():void { theshape = new Sprite(); theshape.graphics.beginFill(0x666666); theshape.graphics.drawCircle(3,5,10); theshape.graphics.endFill(); //i then add it to a Spite Visual Element that's defined in mxml canv.addChild(theshape); } This works fine, until I try to control under which states that canv SpriteVisualElement appears. If I just add an includeIn like this <s:SpriteVisualElement id="canv" includeIn="over" /> I get a run-time error TypeError: Error #1009: Cannot access a property or method of a null object reference. Any ideas what the problem is, or a different way I can accomplish the same thing. What I need is to simply include the circle in the button when it's in the hover state.

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