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• Serializing data using IEnumerable<T> with WebGet

  - by Jim

  possible duplicate: Cannot serialize parameter of type ‘System.Linq.Enumerable… ’ when using WCF, LINQ, JSON Hi, If my method signiature looks like this, it works fine. [WebGet] MyClass[] WebMethod() If the signiature looks like this [WebGet] IEnumerable<T> WebMethod() I get the following error: Cannot serialize parameter of type 'X.Y.Z.T+<WebMethod>d__2c' (for operation 'WebMethod', contract 'IService') because it is not the exact type 'System.Collections.Generic.IEnumerable`1[X.Y.Z.T]' in the method signature and is not in the known types collection. In order to serialize the parameter, add the type to the known types collection for the operation using ServiceKnownTypeAttribute. I have tried adding. ServiceKnownType(typeof(IEnumerable)) Same error. Is this a bug in 2010 beta 2, or is this likely to be correct going forward? Thanks

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• Atomic INSERT/SELECT in HSQLDB

  - by PartlyCloudy

  Hello, I have the following hsqldb table, in which I map UUIDs to auto incremented IDs: SHORT_ID (BIG INT, PK, auto incremented) | UUID (VARCHAR, unique) Create command: CREATE TABLE table (SHORT_ID BIGINT GENERATED BY DEFAULT AS IDENTITY PRIMARY KEY, UUID VARCHAR(36) UNIQUE) In order to add new pairs concurrently, I want to use the atomic MERGE INTO statement. So my (prepared) statement looks like this: MERGE INTO table USING (VALUES(CAST(? AS VARCHAR(36)))) AS v(x) ON ID_MAP.UUID = v.x WHEN NOT MATCHED THEN INSERT VALUES v.x When I execute the statement (setting the placeholder correctly), I always get a Caused by: org.hsqldb.HsqlException: row column count mismatch Could you please give me a hint, what is going wrong here? Thanks in advance.

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• Fastest distance lookup given latitude/longitude?

  - by Ryan Detzel

  I currently have just under a million locations in a mysql database all with longitude and latitude information. With this I use another lat/lng to find the distance of certain places in the database but it's not as fast as I want it to be especially with 100+ hits a second. Is there a faster formula or possibly a faster system other than mysql for this? The formula I'm using is this. select name, ( 3959 * acos( cos( radians(42.290763) ) * cos( radians( locations.lat ) ) * cos( radians( locations.lng ) - radians(-71.35368) ) + sin( radians(42.290763) ) * sin( radians( locations.lat ) ) ) ) AS distance from locations where active = 1 HAVING distance < 10 ORDER BY distance;

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• algorithm to combinatorics

  - by peiska

  I am trying to solve a combinatorics problem, it seems easy, but i am having some trouble with it. If i have at most X tables, and N persons to sit on the tables, Each table can have 1 to N seating places, and I can only sit persons in one side of a rectangular table( so the order how people sit matters). I want to make a code that can calculate all the distributions of seating places from 1 up to K tables. For example, if I have 12 persons and 1 table i have 479001600 ways of seating persons( thats easy to calculate I've used Factorial of 12). But if I have 12 persons and 3 tables i have 4390848000 ways of seating persons. I've tried different solutions but i was not able to find the correct one. I've tried to divided the 12 in 3, then o use factorial of the result (it didnt work), i've tried to use 12! * 3( it didn't work too). Can some one give me a tip in a algorithm that i can use?

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• Compare two dates with JPA

  - by Kiva

  Hello everybody, I need to compare two dates in a JPQL query but it doesn't work. Here is my query: Query query = em.createQuery("SELECT h FROM PositionHistoric h, SeoDate d WHERE h.primaryKey.siteDb = :site AND h.primaryKey.engineDb = :engine AND h.primaryKey.keywordDb = :keyword AND h.date = d AND d.date <= :date ORDER BY h.date DESC"); My parameter date is a java.util.Date My query return a objects list but the dates are upper and lower to my parameter. Someone kown how to do this ? Thanks.

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• System.Net.Mail.MailMessage Raw Content / Spam Assassin

  - by Martin

  Hey everyone, What I am trying to do is pass the raw content of an outgoing email to spamassassin in order to calculate a spam score. I am stuck in how I might get the raw content of the email. My C# code currently just constructs the MailMessage and passes it the SmtpClient's Send() method. Before sending, is there a way to get a raw version of the mail message (as the protocol might see it) so that I can pass this to the spamassassin tool for spam assessment? If I've not explained very well, let me know and I'll try to explain better. Thanks in advance, Martin.

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• will_paginate undefined method error - Ruby on Rails

  - by bgadoci

  I just installed the gem for will_paginate and it says that it was installed successfully. I followed all the instructions listed with the plugin and I am getting an 'undefined method `paginate' for' error. Can't find much in the way of Google search and haven't been able to fix it myself (obviously). Here is the code: PostsController def index @tag_counts = Tag.count(:group => :tag_name, :order => 'updated_at DESC', :limit => 10) @posts = Post.paginate :page => params[:page], :per_page => 50 respond_to do |format| format.html # index.html.erb format.xml { render :xml => @posts } format.json { render :json => @posts } format.atom end end /model/post.rb class Post < ActiveRecord::Base validates_presence_of :body, :title has_many :comments, :dependent => :destroy has_many :tags, :dependent => :destroy cattr_reader :per_page @@per_page = 10 end /posts/views/index.html.erb <%= will_paginate @posts %>

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• Problem with auto page break in iReport

  - by David Reniz

  Hi... I'm using iReport 3.7. I have a report with two subreports (order details and some selling statistics), and a grouping by seller. One subreport is located in the Detail band of the group, and the other one is in the group footer. What's really odd is that no matter how long the report is, when I export it to PDF it's always one page long. Is there something I'm missing? Thanks in advance.

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• Problem with animating the deletion of table rows in jQuery

  - by Victor

  Hey guys, I have written some jQuery code to use the "slideUp" animation when deleting rows from a table. In order for the animation to appear smooth, I wrapped the contents of each TD in the row with DIV tags, and called the slideUp function on the DIVs, removing the actual TDs upon completion of the animation. The code for that is as follows: $("tr[id$=" + rowID + "]").children("td").each(function() { $(this).children("div").slideUp(function() { $(this).parent().remove(); }); }); So far, so good. However, I noticed that this code does not remove the actual TR, only its contents, so I added the following line to remove the TR: $("tr[id$=" + rowID + "]").remove(); The problem is that after I added the line above, the animation quit working. In other words, the row simply disappears without the nice sliding effect. Does anybody know why this is so and how to get around it? Thanks in advance for your insights! Victor

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• No prerequisites are installed on Windows 7 - InstallShield 2010

  - by Sagi1981

  Dear community. has anyone experienced any problems with InstallShield on Windows 7. I have a small application which needs Crystal Reports in order to work. So I have included them in the Setup Wizard, which I have made with InstallShield 2010. It works like a charm, except on windows 7. here it jumps right over the prerequisite installer, and jumps right to the installation of the application. I have searched the web, but it does not seem that anyone has experienced anything like it. Any help is appreciated. I am using installScript, but I can convert the project to MSI if it will help.

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• Good example usage of get_or _create in Django views and raising a Form error

  - by Rik Wade

  I would like to use get_or_create to check whether an object already exists in my database. If it does not, then it will be created. If it does exist, then I will not create the new object, but need to raise a form error to inform the user that they need to enter different data (for example, a different username). The view contains: p, created = Person.objects.get_or_create( email = registration_form.cleaned_data['email'], defaults = { 'creationDate': datetime.datetime.now(), 'dateOfBirth': datetime.date(1970,1,1) }) So 'p' will contain the existing Person if it exists, or the new Person if not. I would like to act on the boolean value in 'created' in order to skip over saving the Person and re-display the registration_form and raise an appropriate form validation error. The alternative I'm considering is doing a check in a custom Form validation method to see whether a Person exists with the data in the provided 'email' field, and just raising a validation error.

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• PGP Command Line Decryption --- How to decrypt file?

  - by whitman6732

  I was sent a public key in order to decrypt a pgp-encrypted file. I imported the key with: gpg --import publickey.asc And verified it with gpg --list-keys Now, I'm trying to decrypt the file. I put the passphrase in a file called pass.txt and ran this at the command line: gpg --passphrase-fd ../../pass.txt --decrypt encryptedfile.txt.pgp --output encryptedfile.txt All it says is: Reading passphrase from file descriptor 0 ... And doesn't seem to be doing anything else. I can't tell if it's hanging or not. Is it a relatively quick process? The file is large ( about 2 GB ). Is the syntax for it correct?

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• How to optimize this MySQL query

  - by James Simpson

  This query was working fine when the database was small, but now that there are millions of rows in the database, I am realizing I should have looked at optimizing this earlier. It is looking at over 600,000 rows and is Using where; Using temporary; Using filesort (which leads to an execution time of 5-10 seconds). It is using an index on the field 'battle_type.' SELECT username, SUM( outcome ) AS wins, COUNT( * ) - SUM( outcome ) AS losses FROM tblBattleHistory WHERE battle_type = '0' && outcome < '2' GROUP BY username ORDER BY wins DESC , losses ASC , username ASC LIMIT 0 , 50

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• Noob-Ready Cython Tutorials

  - by spearfire

  I know a bunch of scripting languages, (python, ruby, lua, php) but I don't know any compiled languages like C/C++ , I wanted to try and speed up some python code using cython, which is essentially a python - C compiler, aimed at creating C extensions for python. Basically you code in a stricter version of python which compiles into C - native code. here's the problem, I don't know C, yet the cython documentation is aimed at people who obviously already know C (nothing is explained, only presented), and is of no help to me, I need to know if there are any good cython tutorials aimed at python programmers, or if I'm gonna have to learn C before I learn Cython. bear in mind I'm a competent python programmer, i would much rather learn cython from the perspective of the language I'm already good at, rather than learn a whole new language in order to learn cython. 1) PLEASE don't recommend psyco edit: ANY information that will help understand the oficial cython docs is useful information

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• Go import error while trying to import web.go package after using goinstall

  - by Metropolis

  With halfdans advice, I was successfully able to use goinstall github.com/hoisie/web.go without any errors after installing git first. However, now when I try to compile the sample code given, go is not finding the web package. I get the error, main.go:4: can't find import: web On this code package main import ( "web" ) func hello(val string) string { return "hello " + val } func main() { web.Get("/(.*)", hello) web.Run("0.0.0.0:9999") } Is there something special I need to do in order for it to recognize the package? I found the package source at $GOROOT/src/pkg/github.com/hoisie/web.go/web. I tried that path as the import and it still did not like that.

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• iPhone Developer Program - Help?

  - by Cal S

  Hi, I just signed up for the iPhone Developer Program (the $99 one), I filled it all out, was directed to the store and completed the purchase. However, when I go to the member center it says I have not completed the purchase: Your Developer Program Enrollment Status: Once you've completed your purchase, you will receive an Order Acknowledgement email from the Apple Online Store and an Activation email within 24 hours from Apple Developer Support. The email from Apple Developer Support will contain information on how to access the resources of your Program. With a link directing me to a page that adds the program to my cart in the Apple store. (A process I have already been through with a success message at the end) Is this what has happened to everyone else? Aren't I supposed to receive an email from Apple at least confirming the purchase? I have received nothing. Thanks a lot.

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• PHP find first of occurrence of string

  - by mike

  I have a string of data like below and I've been struggling trying to figure out how to split it up so that I can use it efficiently. "United States FirstName: Mike LastName: Wolf City: Chicago" I need to split up the string in to substrings and the list may not always be in the same order. For example it could vary like below: "United States City: Chicago FirstName: Mike LastName: Wolf" "United States FirstName: City: Chicago Mike LastName: Wolf" I need to find which parameter comes first after 'United States'. It could be 'City:', 'FirstName:' or 'LastName:'. And, I also need to know the start position of the first parameter. Thanks in advance!

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• F# currying efficiency?

  - by Eamon Nerbonne

  I have a function that looks as follows: let isInSet setElems normalize p = normalize p |> (Set.ofList setElems).Contains This function can be used to quickly check whether an element is semantically part of some set; for example, to check if a file path belongs to an html file: let getLowerExtension p = (Path.GetExtension p).ToLowerInvariant() let isHtmlPath = isInSet [".htm"; ".html"; ".xhtml"] getLowerExtension However, when I use a function such as the above, performance is poor since evaluation of the function body as written in "isInSet" seems to be delayed until all parameters are known - in particular, invariant bits such as (Set.ofList setElems).Contains are reevaluated each execution of isHtmlPath. How can best I maintain F#'s succint, readable nature while still getting the more efficient behavior in which the set construction is preevaluated. The above is just an example; I'm looking for a general pattern that avoids bogging me down in implementation details - where possible I'd like to avoid being distracted by details such as the implementation's execution order since that's usually not important to me and kind of undermines a major selling point of functional programming.

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• Javascript window.open firefox/chrome issue

  - by Adelave

  Hi, I've application to open popup window to print page. function printHTML(urlPath) { var printPopUp = window.open(urlPath,null,"height=600,width=777,status=yes,toolbar=no,menubar=no,location=no,scrollbars=yes"); printPopUp.print(); } This script is working fine in IE, but in firefox/chrome. print() function is overlapping window.open, as a result print dialog is showing first while screen is still loading. I need to close print dialog in order to render page properly then print manually. Please advise.

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• Magic quotes in PHP

  - by VirtuosiMedia

  According to the PHP manual, in order to make code more portable, they recommend using something like the following for escaping data: if (!get_magic_quotes_gpc()) { $lastname = addslashes($_POST['lastname']); } else { $lastname = $_POST['lastname']; } I have other validation checks that I will be performing, but how secure is the above strictly in terms of escaping data? I also saw that magic quotes will be deprecated in PHP 6. How will that affect the above code? I would prefer not to have to rely on a database-specific escaping function like mysql_real_escape_string().

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• IHierarchyData and IHierarchicalEnumerable in Winforms

  - by Jonathan

  Hi! Currently,I know how to do a lazy implementation of the loading procedure of the nodes in a treeview control, and read the related questions in stackoverflow, but I'm also reading about IHierarchyData and IHierarchicalEnumerable interfaces in asp.net (I didn't know to code asp.net) that allow to bind a collection to a treeview in order to display the items automatically. It would like to know if I can do the same in winforms and C#. I think that the interfaces previous mentioned are not available in winforms. Thanks.

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• Differentiating Between UITouch Objects On The iPhone

  - by Jasarien

  Hey guys, I'm trying to differentiate between two (or more) UITouch objects on the iPhone. Specifically, I'd like to know the order in which the touches occurred. For instance, in my -touchesBegan:withEvent: method I get an NSSet of UITouch objects. Now I can find out how many touches there are, but, which object represents which finger? I notice the timestamp property on UITouch - is this what I'm looking for? I see how that would be useful to obtaining the last or first touch - providing the touches don't mutate... Therein lies my problem. I can use the timestamp to single out the latest touch, but then the touch that occurred first moves, and IT becomes the latest touch... At the end of this exercise, I'd like to be able to implement the "pinch" gesture to zoom in or out, etc. Any help would be greatly appreciated, thanks.

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• NameValueCollection vs Dictionary<string,string>

  - by frankadelic

  Any reason I should use Dictionary<string,string instead of NameValueCollection? (in C# / .NET Framework) Option 1, using NameValueCollection: //enter values: NameValueCollection nvc = new NameValueCollection() { {"key1", "value1"}, {"key2", "value2"}, {"key3", "value3"} }; // retrieve values: foreach(string key in nvc.AllKeys) { string value = nvc[key]; // do something } Option 2, using Dictionary<string,string... //enter values: Dictionary<string, string> dict = new Dictionary<string, string>() { {"key1", "value1"}, {"key2", "value2"}, {"key3", "value3"} }; // retrieve values: foreach (KeyValuePair<string, string> kvp in dict) { string key = kvp.Key; string val = kvp.Value; // do something } For these use cases, is there any advantage to use one versus the other? Any difference in performance, memory use, sort order, etc.?

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• Android: How to create an onclick event for a SimpleCursorAdapter?

  - by user117701

  I have this code: db=(new DatabaseHelper(this)).getWritableDatabase(); constantsCursor=db.rawQuery("SELECT _ID, title, subtitle, image "+ "FROM news ORDER BY title", null); ListAdapter adapter=new SimpleCursorAdapter(this, R.layout.row, constantsCursor, new String[] {"title", "subtitle", "image"}, new int[] {R.id.value, R.id.title, R.id.icon}); setListAdapter(adapter); registerForContextMenu(getListView()); Which displays a list of titles. I dont however for the life of me know how to create a click event so that i can call another view when i click an item from that list. Anyone?

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• Windows 64-bit registry v.s. 32-bit registry

  - by George2

  Hello everyone, I heard on Windows x64 architecture, in order to support to run both x86 and x64 application, there is two separate/different sets of Windows registry -- one for x86 application to access and the other for x64 application to access? For example, if a COM registers CLSID in the x86 set of registry, then x64 application will never be able to access the COM component by CLSID, because x86/x64 have different sets of registry? So, my question is whether my understanding of the above sample is correct? I also want to get some more documents to learn this topic, about the two different sets of registry on x64 architecture. (I did some search, but not found any valuable information.) thanks in advance, George

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