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• Efficient way to ASCII encode UTF-8

  - by Andreas Gohr

  I'm looking for a simple and efficient way to store UTF-8 strings in ASCII-7. With efficient I mean the following: all ASCII chars in the input should stay ASCII chars in the output the resulting string should be as short as possible the operation needs to be reversable without any data loss there should be no restriction on the input length the whole UTF-8 range should be allowed My first idea was to use Punycode (IDNA) as it fits the first three requirements, but it fails at the last two. Can anyone recommend an alternative encoding scheme? Even better if there's some code available to look at.

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• Artificial Intelligence in online game using Google App Engine

  - by Hortinstein

  I am currently in the planning stages of a game for google app engine, but cannot wrap my head around how I am going to handle AI. I intend to have persistant NPCs that will move about the map, but short of writing a program that generates the same XML requests I use to control player actions, than run it on another server I am stuck on how to do it. I have looked at the Task Queue feature, but due to long running processes not being an option on the App engine, I am a little stuck. I intend to run multiple server instances with 200+ persistant NPC entities that I will need to update. Most action is slowly roaming around based on player movements/concentrations, and attacking close range players...(you can probably guess the type of game im developing)

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• Difference of two 'uint'

  - by vanslly

  When you attempt to declare an unsigned variable in C#.NET with a value outside its value range it is flagged as a compiler error, but if you produce a negative value at runtime and assign it to that variable at runtime the value wraps. uint z = -1; // Will not compile uint a = 5; uint b = 6; uint c = a - b; // Will result in uint.MaxValue Is there a good reason why unsigned variables wrap in such a situation instead of throwing an exception? Thanks.

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• How to query a date in HQL (Hibernate) with Joda Time?

  - by fabien7474

  I am sure that someone familiar with HQL (I am myself a newbie) can easily answer this question. In my Grails application, I have the following domain class. class Book { org.joda.time.DateTime releaseDate //I use the PersistentDateTime for persisting via Hibernate (that use a DATETIME type for MySQL DB) } In my HQL query, I want to retrieve books whose release date is included in range date1..date2 For instance I tried: DateTime date1, date2 ... def queryStr = "select * from Book as b where b.releaseDate > $date1 and b.releaseDate < $date2" def res = Book.executeQuery(queryStr) But I got the exception ...caused by: org.springframework.orm.hibernate3.HibernateQueryException: unexpected token: The error token points to date format (for instance 2009-11-27T21:57:18.010+01:00 or Fri Nov 27 22:01:20 CET 2009) I have also tried to convert date1 into a Date class without success So what is the correct HQL code ? Should I convert to a specific format (which one?) using the patternForStyle method or is there another -cleaner- way to do it? Thanks, Fabien.

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• How to detect an overflow in C++ ?

  - by Tim

  Hi, I just wonder if there is some convenient way to detect if overflow happens to any variable of any default data type used in a C++ program during runtime? By convenient, I mean no need to write code to follow each variable if it is in the range of its data type every time its value changes. Or if it is impossible to achieve this, how would you do? For example, float f1=FLT_MAX+1; cout << f1 << endl; doesn't give any error or warning in either compilation with "gcc -W -Wall" or running. Thanks and regards!

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• python - sys.argv and flag identification

  - by tekknolagi

  when I accept arguments how do I check if two show up at the same time without having a compound conditional i.e. #!/usr/bin/python import random, string import mymodule import sys z = ' '.join(sys.argv[2:]) q = ''.join(sys.argv[3:]) a = ''.join(sys.argv[2:]) s = ' '.join(sys.argv[1:]) flags = sys.argv[1:5] commands = [["-r", "reverse string passed next with no quotes needed."], ["-j", "joins arguments passed into string. no quotes needed."], ["--palindrome", "tests whether arguments passed are palindrome or not. collective."],["--rand","passes random string of 10 digits/letters"]] try: if "-r" in flags: if "-j" in flags: print mymodule.reverse(q) if not "-j" in flags: print mymodule.reverse(z) if "-j" in flags: if not "-r" in flags: print a if "--palindrome" in flags: mymodule.ispalindrome(z) if (not "-r" or not "-j" or not "--palindrome") in flags: mymodule.say(s) if "--rand" in flags: print(''.join([random.choice(string.ascii_letters+"123456789") for f in range(10)])) if not sys.argv[1]: print mymodule.no_arg_error if "--help" in flags: print commands except: print mymodule.no_arg_error i just want to be able to say if "-r" and "-j" in flags in no particular order: do whatever

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• Increasing speed of webservice - howto

  - by Koran

  Hi, Our client-server product has the protocol between them as XML over HTTP. Here, the client asks a GET/POST query to the web server and the server responds with XML. The server is written using django. The server has to be on the web because there are many clients across the world using this. The server code uses extensive memoization and also there is very less db queries - most queries dont have any db queries, some of them has max 1. The biggest problem is the speed. Every query takes close to 5 seconds for the reply. The data replied is also very less - in the range of 4-6 Kb. What are the mechanisms to improve speed of the web service? Is this the usual way of writing a client-server? Are there other technologies and are we missing out on it? Thank you K

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• Problem with writing if condition

  - by Himadri

  I have two decimal numbers. I want those number to be same upto 4 decimal points without rounding. If numbers are different I want 2nd number to be replaced by 1st. What if condition should I write? Eg, 1. num1 = 0.94618976 num2 = 0.94620239 If we round these numbers upto 4 decimal then we get 0.9462 same number, but I don't want to round these numbers. 2. num1 = 0.94620239 num2 = 0.94639125 The one way I found is take absolute difference of both numbers say diff and then check the value. My problem is of checking the range of diff. I am using delphi but you can answer in any language.Thank You.

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• Does DataType DataAnnotation Check the Expression?

  - by Jason

  I am currently using DataAnnotations within my ASP.NET MVC website to ensure data is properly validated. One question I wanted to verify (I think I know the answer, but I can't find verification online) - does the DataType DataAnnotation perform regular expression checks to ensure that you have received a valid e-mail/phone/currency/etc? [Required(ErrorMessage = "Price required")] [DataType(DataType.Currency, ErrorMessage = "Not a valid price")] [Range(0, double.MaxValue, ErrorMessage = "Price must be greater than 0.")] public decimal Price { get; set; } I believe the answer is no (meaning I have to provide my own, custom, RegularExpressionAttribute), but I wanted to double check before I do that for various field types.

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• Complex Join - involving date ranges and sum...

  - by calumbrodie

  I have two tables that I need to join... I want to join table1 and table2 on 'id' - however in table two id is not unique. I only want one value returned for table two, and this value represents the sum of a column called 'total_sold' - within a specified date range (say one month).. SELECT ta.id, tb.total_sold as total_sold_this_week FROM table_a as ta LEFT JOIN table_b as tb ON ta.id=tb.id AND tb.date_sold BETWEEN ADDDATE(NOW(),INTERVAL -3 WEEK) AND NOW() this works but does not SUM the rows - only returning one row for each id... how do I get the sum from table b instead of only one row??? Please criticise if format of question could use more work - I can rewrite and provide sample data if required - this is a trivialised version of a much larger problem. -Thanks

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• Caesar Cipher in Java (Spanish Characters)

  - by Rodolfo

  I've reading this question, and I was wondering if Is there any way to consider the whole range of characters? For example, "á", "é", "ö", "ñ", and not consider " " (the [Space])? (For example, my String is "Hello World", and the standard result is "Khoor#Zruog"; I want to erase that "#", so the result would be "KhoorZruog") I'm sure my answer is in this piece of code: if (c >= 32 && c <= 127) { // Change base to make life easier, and use an // int explicitly to avoid worrying... cast later int x = c - 32; x = (x + shift) % 96; chars[i] = (char) (x + 32); } But I've tried some things, and it didn't work.

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• Recommendations on Triming Large Amounts of Text from a DOM Object

  - by aronchick

  I'm doing some in browser editing, and I have some content that's on the order of around 20k characters long in a <pre>. So it looks something like: <pre> Text 1 Text 2 Text 3 Text 4 [...] Text 20,000 </pre> I'd like to use jquery to trim it down when someone hits a button to chop, but I'm having trouble doing it without overloading the browser. Assume I know that the character numbers are at 16,510 - 17,888, and what I'd like to do is trim it. I was using: jQuery('#textsection').html(jQuery('textarea').html().substr(range.start)); But browsers seem to enjoy crashing when I do this. Alternatives?

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• GameKit peer to peer wifi without wireless router?

  - by Tim

  Hi all! Thanks in advance for any thoughts about this. I'm looking for a way to do realtime inter-app communication in iOS via wi-fi (I need about 150 ft range and don't think bluetooth offers this) and wonder about the peer-to-peer connectivity offered by GameKit which, apparently offers both bluetooth and wi-fi connectivity. My question is: must participating devices be members of an available wireless network (via a wireless router) or is this connectivity truly peer-to-peer requiring no router? I understand Wi-fi Direct is coming and would likely be an option. Just wondering if I can do this utilizing services available in iOS today. Thanks! Tim

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• How can I perform a web query in C# similar to the Data > Import External Data > New Web Query in Mi

  - by TNT

  I need to pull data from a table on a website. I can easily do this in VBA using the Web Query, but I need to do this in C#. I'm just having some trouble figuring out how to properly convert the code. I got something close, but it's returning HTML with the data. I just want the data. Any help would be great. The block of code giving me issues is below: Private Function GetData(ByVal theURL As String, ByVal theRow As Integer, ByVal thePosition As Integer, ByVal theColumn As String, ByVal theTable As Integer) With ActiveSheet.QueryTables.Add(Connection:="URL;" + theURL, Destination:=Sheet2.Range(theColumn & theRow + 1)) .Name = "op?s=" + Mid(theURL, thePosition + 1) + "_1" .PreserveFormatting = True .AdjustColumnWidth = True .WebTables = theTable .Refresh BackgroundQuery:=False End With End Function

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• Getting error on inserting tuple values in postgreSQL table using python

  - by rahman.bd

  Hello, I want to keep last.fm's user recent music tracks list to postgresql database table using pylast interface.But when I tried to insert values to the table it shows errors.Code example: for i, artist in enumerate(recent_tracks): for key in sorted(artist): cur.execute(""" INSERT INTO u_recent_track(Playback_date,Time_stamp,Track) VALUES (%s,%s)""", (key, artist[key])) conn.commit() cur.execute("SELECT * FROM u_recent_track;") cur.fetchone() for row in cur: print ' '.join(row[1:]) cur.close() conn.close() Here "recent_tracks" tuple have the values for example: artist 0 - playback_date : 5 May 2010, 11:14 - timestamp : 1273058099 - track : Brian Eno - Web I want to store these value under u_recent_track(Tid,Playback_date,Time_stamp,Track).Can anybody have idea how to sort out this problem? when I tried to run, it shows error: Traceback (most recent call last): File "F:\JavaWorkspace\Test\src\recent_track_database.py", line 50, in <module> VALUES (%s,%s,%s)""", (key, artist[key])) IndexError: tuple index out of range Thanks in advanced!

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• Bind any version of MySql.Data using the app.config

  - by Martin Kirsche

  How do I bind any version or a range of versions of an assembly by using the app.config? I'm currently binding the MySql.Data assembly like this: <runtime> <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1" applies-to="v2.0.50727"> <qualifyAssembly partialName="MySql.Data" fullName="MySql.Data, Version=6.2.2.0, Culture=neutral, PublicKeyToken=c5687fc88969c44d, processorArchitecture=MSIL"/> </assemblyBinding> </runtime> Any version of MySql.Data other than 6.2.2.0 is not working this way. The versions of this assembly are changing fast so I either want to bind any or all versions beginning with 6.2 to my application without changing the app.config each time.

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• Update specific rows in LINQ to SQL result set.

  - by davemackey

  I have a page with a form on it and needs a range of dates. Thus I've placed a number of textboxes on the page into which users can type dates. When the user clicks the save button I want to trigger a LINQ update to the SQL Server...all the rows already exist, so I'm just updating existing data. How can I do this? For example, lets say my table looks like this: Column Names: Description dateValue Column Values: Birthdate 1/1/1990 Anniversary 1/10/1992 Death 1/1/1993 I want to do something like this: hupdate.Description("Birthdate").dateValue = TextBox1.Text hupdate.Description("Anniversary").dateValue = TextBox2.Text hupdate.Description("Death").dateValue = TextBox3.Text hconfig.SubmitChanges() Is there a way to do this with LINQ?

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• OpenGL: Textured Primitives + High Framerate

  - by James D

  Short version: What's the best practice going forward for efficiently rendering large numbers of independent texture-mapped, lighted 2D/3D primitives (circles, rects, etc.) in OpenGL? For example: a typical particle system using billboarded quads/triangles, point sprites, or whatever other technique, with blending. Because after reading this thread on the messiness of OpenGL versioning/deprecation I'm starting to have my doubts. My specific question is not the ABCs of displaying primitives in OpenGL, but rather how to do so efficiently in post-deprecation (or pre-deprecation) OpenGL, in a way that's going to be compatible with a wide range of commodity hardware and in a way that's not going to break or itself get deprecated, five years down the line. Thanks!

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• Are there cross-platform tools to write XSS attacks directly to the database?

  - by Joachim Sauer

  I've recently found this blog entry on a tool that writes XSS attacks directly to the database. It looks like a terribly good way to scan an application for weaknesses in my applications. I've tried to run it on Mono, since my development platform is Linux. Unfortunately it crashes with a System.ArgumentNullException deep inside Microsoft.Practices.EnterpriseLibrary and I seem to be unable to find sufficient information about the software (it seems to be a single-shot project, with no homepage and no further development). Is anyone aware of a similar tool? Preferably it should be: cross-platform (Java, Python, .NET/Mono, even cross-platform C is ok) open source (I really like being able to audit my security tools) able to talk to a wide range of DB products (the big ones are most important: MySQL, Oracle, SQL Server, ...)

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• Embed font in a mac bundle

  - by RW

  I have a program I am writing. I want to use a fancy font. Can I just embed my font into my bundle and use it from there. My code... NSMutableAttributedString *recOf; recOf = [[NSMutableAttributedString alloc] initWithString:@"In Recognition of"]; length = [recOf length]; [recOf addAttribute:NSFontAttributeName value:[NSFont fontWithName:@"Edwardian Script ITC" size:50] range:NSMakeRange(0, length)]; [[NSColor blackColor] set]; p.x = (bounds.size.width/2)- (([recOf size].width)/2); p.y = (bounds.size.height/1.7); [recOf drawAtPoint:p]; [recOf release];

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• Python Beginner: Selective Printing in loops

  - by Jonathan Straus

  Hi there. I'm a very new python user (had only a little prior experience with html/javascript as far as programming goes), and was trying to find some ways to output only intermittent numbers in my loop for a basic bicycle racing simulation (10,000 lines of biker positions would be pretty excessive :P). I tried in this loop several 'reasonable' ways to communicate a condition where a floating point number equals its integer floor (int, floor division) to print out every 100 iterations or so: for i in range (0,10000): i = i + 1 t = t + t_step #t is initialized at 0 while t_step is set at .01 acceleration_rider1 = (power_rider1 / (70 * velocity_rider1)) - (force_drag1 / 70) velocity_rider1 = velocity_rider1 + (acceleration_rider1 * t_step) position_rider1 = position_rider1 + (velocity_rider1 * t_step) force_drag1 = area_rider1 * (velocity_rider1 ** 2) acceleration_rider2 = (power_rider2 / (70 * velocity_rider1)) - (force_drag2 / 70) velocity_rider2 = velocity_rider2 + (acceleration_rider2 * t_step) position_rider2 = position_rider2 + (velocity_rider2 * t_step) force_drag2 = area_rider1 * (velocity_rider2 ** 2) if t == int(t): #TRIED t == t // 1 AND OTHER VARIANTS THAT DON'T WORK HERE:( print t, "biker 1", position_rider1, "m", "\t", "biker 2", position_rider2, "m"

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• Reading a triangle of numbers into a 2d array of ints in Python

  - by Gabriel Silk

  I want to read a triangle of integer values from a file into a 2D array of ints using Python. The numbers would look like this: 75 95 64 17 47 82 18 35 87 10 20 04 82 47 65 ... The code I have so far is as follows: f = open('problem18.input', 'r') arr = [] for i in range(0, 15): arr.append([]) str = f.readline() a = str.split(' ') for tok in a: arr[i].append(int(tok[:2])) print arr I have a feeling this could be done in a tighter, more Pythonesque way. How would you do it?

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• Processes sharing cores on Ubuntu system

  - by muckabout

  My coworkers and I share an 8-core server running Ubuntu for our batch processes. I tend to run 4 processes at a time, each of which consumes 100% CPU per core when nothing else is running. When a coworker runs his processes (typically about 4 at a time), his also get 100% per. However, when both of us run ours (he always goes first), his still get 100% and mine seem to divide the remaining processing power and linger in the 10-40% range. I even reniced his process to a lower value and it did not change. What are the issues that may cause this?

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• MSSQL 2000 Stored Procedure to Split Shift Times

  - by JClaspill

  I am being asked to alter a system to include the ability to have pay differentials based on hours worked. The old method included a stored procedure (MSSQL2000 db) that did the basics, but simply knows the start and end of every shift. So, this is the information I start with: EMPLOYEE | TYPE | HOURS | INSTAMP | OUTSTAMP Dave | Hourly | 8.643055 | 2011-01-08 07:57:35.557 | 2011-01-08 16:36:10.120 And I need to turn that into something like: EMPLOYEE | TYPE | HOURS | INSTAMP | OUTSTAMP Dave | Hourly | 4.00 | 2011-01-08 08:00:00.000 | 2011-01-08 12:00:00.000 Dave | ShiftDiff1 | 4.50 | 2011-01-08 12:00:00.000 | 2011-01-08 16:30:00.000 The ShiftDiff's range from hours to certain days, to a combo of both. Should I try to make the SQL2000 SP do this or pass the info back to my ASP.NET(C#) app and let it handle it, then send back?

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• When should I use static methods in a class and what are the benefits?

  - by NAVEED

  I have concept of static variables but what are the benefits of static methods in a class. I have worked on some projects but I did not make a method static. Whenever I need to call a method of a class, I create an object of that class and call the desired method. Static variable in a method holds it's value even when method is executed but accessible only in its containing method but what is the best definition of static method? Is calling the static method without creating object of that class is the only benefit of static method? What is the accessible range for static method? What is the syntax to create and calling static method in php? Thanks

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