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• NSPredicates with custom objects

  - by Horatiu Paraschiv

  Hi, I have the following problem and I cannot figure out how to solve it. I have an NSSet which contains Person objects (NSDictionary with 2 keys: name, age). From time to time I get an NSArray of Person objects and I want to add them to my NSSet but I want to filter out the duplicates. I'm thinking I could use NSPredicates but I am reading the documentation and I can't understand how should I format my NSPredicate to filter out my array content based on what I already have in NSSet. So I have an NSSet with 5 custom objects and I get an NSArray with 6 objects but 3 of them already exist in NSSet and I want to filter them out. I understand what I should do with basic objects like Strings, integers, etc but I don't know how to extend this to work with custom more complex objects. I hope I was clear enough with my problem. Any starting point, example or advice is much appreciated. Thank you!

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• Is there an online user agent database?

  - by Gary Richardson

  How do you parse your user agent strings? I'm looking to get: Browser Browser Version OS OS Version from a user agent string. My app is written in perl and was previously using HTTP::BrowserDetect. It's a bit dated and is no longer maintained. I'm in no way tied to using perl for the actual lookup. I've come to the conclusion that automagic parsing is a lost cause. I was thinking of writing a crud type app to show me a list of unclassified UA's and manually keep them up to date. Does such an resource already exist that I can tap into? It would be awesome if I could make an HTTP call to look up the user agent info. Thanks!

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• how to read specific number of floats from file in python?

  - by sahel

  I am reading a text file from the web. The file starts with some header lines containing the number of data points, followed the actual vertices (3 coordinates each). The file looks like: # comment HEADER TEXT POINTS 6 float 1.1 2.2 3.3 4.4 5.5 6.6 7.7 8.8 9.9 1.1 2.2 3.3 4.4 5.5 6.6 7.7 8.8 9.9 POLYGONS the line starting with the word POINTS contains the number of vertices (in this case we have 3 vertices per line, but that could change) This is how I am reading it right now: ur=urlopen("http://.../file.dat") j=0 contents = [] while 1: line = ur.readline() if not line: break else: line=line.lower() if 'points' in line : myline=line.strip() word=myline.split() node_number=int(word[1]) node_type=word[2] while 'polygons' not in line : line = ur.readline() line=line.lower() myline=line.split() i=0 while(i<len(myline)): contents[j]=float(myline[i]) i=i+1 j=j+1 How can I read a specified number of floats instead of reading line by line as strings and converting to floating numbers? Instead of ur.readline() I want to read the specified number of elements in the file Any suggestion is welcome..

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• How to stop a WPF binding from ignoring the PropertyChanged event that it caused?

  - by Jacob Stanley

  I have a TextBox bound to a ViewModel's Text property with the following setup: Xaml <TextBox Text="{Binding Text}"/> C# public class ViewModel : INotifyPropertyChanged { public string Text { get { return m_Text; } set { if (String.Equals(m_Text, value)) { return; } m_Text = value.ToLower(); RaisePropertyChanged("Text"); } } // Snip } When I type some stuff in to the TextBox it successfully sets the Text property on the ViewModel. The problem is that WPF ignores the property changed event that is raised by it's own update. This results in the user not seeing the text they typed converted to lowercase. How can I change this behaviour so that the TextBox updates with lowercase text? Note: this is just an example I have used to illustrate the problem of WPF ignoring events. I'm not really interested in converting strings to lowercase or any issues with String.Equals(string, string).

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• iPhone Dev: Animating PNG Sequences

  - by Franky

  What is the best or recommended technique for animating PNG Sequences. Heres what I've learned: Do it Manually Using MutableArrays containing Strings, you can animate a UIImageView with a timer which increments an index number UIImage - animation methods This works, the only problem is to find if an image has completed its animation, you have to check the isAnimating BOOL, and to do that you need a timer. What is the best and recommended? Looking to do Oldschool game sprite animations, ie: Idle Animation Attack Animation Walk Animation ect... Let me know if any one has something. @lessfame

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• NSString stringWithFormat

  - by Leo

  Hi Guys, I don't know what I am missing here. I am trying to concatenate strings using NSString stringWithFormat function. This is what I am doing. NSString *category = [row objectForKey:@"category"]; NSString *logonUser = [row objectForKey:@"username"]; user.text = [NSString stringWithFormat:@"In %@ by %@", category, logonUser]; The problem here is that it always print only one variable. Say if there is "Sports" in category and "Leo" in logonUser it will print "In Sports" and skip the remaining text. It should print "In Sports by Leo". Thanks

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• How can I sort an NSTableColumn of NSStrings ignoring "The " and "A "?

  - by David Barry

  I've got a simple Core Data application that I'm working on to display my movie collection. I'm using an NSTableView, with it's columns bound to attributes of my Core Data store through an NSArrayController object. At this point the columns sort fine(for numeric values) when the column headers are clicked on. The issue I'm having is with the String sorting, they sort, however it's done in standard string fashion, with Uppercase letters preceding lowercase(i.e. Z before a). In addition to getting the case sorting to work properly, I would like to be able to ignore a prefix of "The " or "A " when sorting the strings. What is the best way to go about this in Objective-C/Cocoa?

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• Possible to load an Enum based on a string name?

  - by Cooter

  OK, I don't think the title says it right... but here goes: I have a class with about 40 Enums in it. i.e: Class Hoohoo { public enum aaa : short { a = 0, b = 3 } public enum bbb : short { a = 0, b = 3 } public enum ccc : short { a = 0, b = 3 } } Now say I have a Dictionary of strings and values, and each string is the name of above mentioned enums: Dictionary<string,short>{"aaa":0,"bbb":3,"ccc":0} I need to change "aaa" into HooBoo.aaa to look up 0. Can't seem to find a way to do this since the enum is static. Otherwise I'll have to write a method for each enum to tie the string to it. I can do that but thats mucho code to write. Thanks, Cooter

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• Converting 24BPP to 4BPP with GDI+ in VB.NET

  - by Chris

  My VB.NET program currently takes a 4BPP TIFF as an Bitmap, converts it to a Graphic, adds some text strings and then saves it out again as a TIFF file. The output Bitmap.Save() TIFF file by default seems to be 24BPP (regardless of the input) and is a lot larger than the original TIFF. Is it possible to keep the same 4BPP palette encoding as the input for the output and if not, how can I convert my Bitmap PixelFormat from 24BPP to 4BPP Indexed. I've seen an example for converting 24 BPP to 1 BPP at http://www.bobpowell.net/onebit.htm using BitmapData.Lockbits() but cannot figure out how to do it for 4BPP. Many thanks Chris

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• How to parse the MailMessage object from raw email string

  - by Xmindz

  I have written a program in C# which connects to a POP Server and retrieves raw email message strings from the server using POP3 command RETR. Since the email message being retrieved by the program is in plain text format with all the headers and message body with in the same, its too difficult to extract each header and mail body from the raw string. Could anybody tell me a solution by which I can parse the entire raw text to a System.Net.Mail.MailMessage object? Following is a sample email raw string: +OK 1281 octets Return-Path: <[email protected]> Delivered-To: samplenet-sample:[email protected] X-Envelope-To: [email protected] Received: (qmail 53856 invoked from network); 22 Sep 2012 06:11:46 -0000 Received: from mailwash18.pair.com (66.39.2.18) MIME-Version: 1.0 From: "Deepu" <[email protected]> To: [email protected] Date: 22 Sep 2012 11:41:39 +0530 Subject: TEST Subject Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable Message-Id: <[email protected]> TEST Body .

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• C#/ASP.NET MVC 4 Instantiate Object Derived From Interface In Factory Method

  - by Chris

  Currently have a Factory class that features a GetSelector function, which returns a concrete implementation of ISelector. I have several different classes that implement ISelector and based on a setting I would like to receive the appropriate ISelector back. public interface ISelector { string GetValue(string Params); } public class XmlSelector : ISelector { public string GetValue(string Params) { // open XML file and get value } } public static class SelectorFactory { public static ISelector GetSelector() { return new XmlSelector(); // Needs changing to look at settings } } My question is what is the best way to store the setting? I am aware of using AppSettings etc. but I'm not sure whether I want to have to store strings in the web.config and perform a switch on it - just seems to be really tightly coupled in that if a new implementation of ISelector is made, then the Factory would need to be changed. Is there any way of perhaps storing an assembly name and instantiating based on that? Thanks, Chris

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• ADO.NET Commands and SQL query plans

  - by ingredient_15939

  I've been reading up on query plans and how to minimise duplicate plans being created by SQL Server for the same basic query. For example, if I understand correctly, sending both these query strings will result in 2 different query plans: "SELECT FirstName FROM Members WHERE LastName = 'Lee'" "SELECT FirstName FROM Members WHERE LastName = 'MacGhilleseatheanaich'" Using a stored procedure avoids this, as the query plan is the same, and "LastName" is passed as a variable, eg: CREATE PROCEDURE sp_myStoredProcedure @LastName varchar(100) AS SELECT FirstName FROM Members WHERE LastName = @LastName Go Now, my question is whether the same applies to the Command object (eg. SQLClient.SQLCommand in ADO.NET). The reason I ask is that string parameters don't have a defined max length, as in the code above. Take the following code: MyCmd.CommandText = "SELECT FirstName FROM Members WHERE LastName = @LastName" MyCmd.Parameters.AddWithValue("@LastName", "Lee") Then later: MyCmd.Parameters.Clear() MyCmd.Parameters.AddWithValue("@LastName", "MacGhilleseatheanaich") Since @LastName hasn't been declared to SQL Server as having a defined maximum length, will SQL Server create a new query plan for every different value when I execute the command this way?

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• ASCIIMath and TiddlyWiki

  - by Space_C0wb0y

  I use TiddlyWiki for work-notes. I already have pretty large wiki, but now I want to add math-support. As far as I understand what is written here, all I would have to do to use ASCIIMathML in my wiki would be including the script ASCIIMathML.js. Doesn't work (no effect at all). Then I found this plugin for TiddlyWiki, but when I import it to my wiki, it gives me an error in one of the regexp strings. When I download that wiki directly, ASCIIMath does not work anymore, even though I have the script in the same directory. Does anyone have a solution available, how I can add ASCIIMath to my existing TiddlyWiki?

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• Regex: Matching a space-joined list of words, excluding last whitespace

  - by Jesper

  How would I match a space separated list of words followed by whitespace and some optional numbers? I have this: >>> import re >>> m = re.match('(?P<words>(\w+\s+)+)(?P<num>\d+)?\r\n', 'Foo Bar 12345\r\n') >>> m.groupdict() {'num': '12345', 'words': 'Foo Bar '} I'd like the words group to not include the last whitespace(s) but I can't figure this one out. I could do a .strip() on the result but that's not as much fun :) Some strings to test and wanted result: 'Foo & Bar 555\r\n' => {'num': '555', 'words': 'Foo & Bar'} 'Hello World\r\n' => {'num': None, 'words': 'Hello World'} 'Spam 99\r\n' => {'num': 99, 'words': 'Spam'} 'Number 1 666\r\n' => {'num': 666, 'words': 'Number 1'}

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• Man machine interface command syntax and parsing

  - by idimba

  What I want is to add possibility to interact with application, and be able to extract information from application or event ask it to change some states. For that purpose I though of building cli utility. The utility will connect to the application and send user commands (one line strings) to the application and wait for response from the application. The command should contain: - command name (e.g. display-session-table/set-log-level etc.) - optionally command may have several arguments (e.g. log-level=10) The question to choose syntax and to learn parse it fast and correctly. I don't want to reinvent the whell, so maybe there's already an answer out there.

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• WCF DataContract with readonly properties

  - by Asaf R

  I'm trying to return a complex type from a service method in WCF. I'm using C# and .NET 4. This complex type is meant to be invariant (the same way .net strings are). Furthermore, the service only returns it and never recieves it as an argument. If I try to define only getters on properties I get a run time error. I guess this is because no setters causes serialization to fail. Still, I think this type should be invariant. Example: [DataContract] class A { [DataMember] int ReadOnlyProperty {get; private set;} } The service fails to load due to a problem with serialization. Is there a way to make readonly properties on a WCF DataContract? Perhaps by replacing the serializer? If so, how? If not, what would you suggest for this problem? Thanks, Asaf

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• big O notation algorithm

  - by niggersak

  Use big-O notation to classify the traditional grade school algorithms for addition and multiplication. That is, if asked to add two numbers each having N digits, how many individual additions must be performed? If asked to multiply two N-digit numbers, how many individual multiplications are required? . Suppose f is a function that returns the result of reversing the string of symbols given as its input, and g is a function that returns the concatenation of the two strings given as its input. If x is the string hrwa, what is returned by g(f(x),x)? Explain your answer - don't just provide the result!

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• c++ vector.push_back error: request for member 'push_back'..., which is of non-class type 'vector(ch

  - by Ziplin

  I'm using Cygwin with GCC, and ultimately I want to read in a file of characters into a vector of characters, and using this code #include <fstream> #include <vector> #include <stdlib.h> using namespace std; int main (int argc, char *argv[] ) { vector<char> string1(); string1.push_back('a'); return 0; } generates this compile time error: main.cpp: In function int main(int, char**)': main.cpp:46: error: request for memberpush_back' in string1', which is of non -class typestd::vector ()()' I tried this with a vector of ints and strings as well and they had the same problem.

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• String Matching.

  - by Harikrishna

  I have a string String mainString="///BUY/SELL///ORDERTIME///RT///QTY///BROKERAGE///NETRATE///AMOUNTRS///RATE///SCNM///"; Now I have another strings String str1= "RT"; which should be matched only with RT which is substring of string mainString but not with ORDERTIME which is also substring of string mainString. String str2= "RATE" ; And RATE(str2) should be matched with RATE which is substring of string mainString but not with NETRATE which is also substring of string mainString. How can we do that ?

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• Adding barcodes to pdfs

  - by calccrypto

  is there any way to do something like a mail merge, where the data (9-15 chars long) is converted to a barcode? im using trying to use openoffice's code128 for calc, but for some reason, every 10 strings, the barcode goes crazy, and the ascii tells me to register at the site where the extension came from, which i dont want to do i also found one for oodraw, but that requires the values to be inputted manually. since im not familiar with the macros, i can't write something that will do it automatically what im trying to do is: take an old pdf (only 1 page) covert it to word or picture or something add a function/macro/whatever to show a barcode (whether or not the barcode shows in this file, i dont care), given a string from excel data reconvert to separate pdfs or some other way that adds barcodes to pdfs all other free programs i have found do not do this nicely, and since im not really a pdf person, im not going to buy random programs. i just need this done for one large batch of data

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• How to iterate loop inside a string searching for any word aftera fixed keyword?

  - by Parth

  Suppose I have a sting as "PHP Paddy,PHP Pranav,PHP Parth", now i have a count as 3,now how should I iterate loop in the string aiming on string after "PHP " to display the all the names? Alright This is the string "BEGIN IF (NEW.name != OLD.name) THEN INSERT INTO jos_menuaudit set menuid=OLD.id, oldvalue = OLD.name, newvalue = NEW.name, field = "name"; END IF; IF (NEW.alias != OLD.alias) THEN INSERT INTO jos_menuaudit set menuid=OLD.id, oldvalue = OLD.alias, newvalue = NEW.alias, field = "alias"; END IF; END" in which i am searching the particular word after " IF (NEW.", and after that particualar others strings should not b displayed, hence whenever in a loop it finds " IF (NEW." I musr get a word just next to it. and in this way an array should b ready for to use.

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• Simple Python Challenge: Fastest Bitwise XOR on Data Buffers

  - by user213060

  Challenge: Perform a bitwise XOR on two equal sized buffers. The buffers will be required to be the python str type since this is traditionally the type for data buffers in python. Return the resultant value as a str. Do this as fast as possible. The inputs are two 1 megabyte (2**20 byte) strings. The challenge is to substantially beat my inefficient algorithm using python or existing third party python modules (relaxed rules: or create your own module.) Marginal increases are useless. from os import urandom from numpy import frombuffer,bitwise_xor,byte def slow_xor(aa,bb): a=frombuffer(aa,dtype=byte) b=frombuffer(bb,dtype=byte) c=bitwise_xor(a,b) r=c.tostring() return r aa=urandom(2**20) bb=urandom(2**20) def test_it(): for x in xrange(1000): slow_xor(aa,bb)

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• DataAnnotations in ASP.NET MVC 2 - Stop MVC from applying RequiredAttribute to Non-nullable DateTime

  - by jwwishart

  Im trying to create a custom version of the RequiredAttribute to replace the built in one and I've got it working for properties that have strings values, but with properties that are DateTime or integer for example, the default RequiredAttribute seems to be applied automatically (IF the property is not nullable!) My problem is that i want to be able to specify a DateTime property as required using my custom required validator which gets the error message from a resources file (I don't want to have to tell the RequiredAttribute the type of the resource file and the key every time i apply it. That is why I'm making a custom one.) How can i prevent the framework from applying the required attribute to properties of type DateTime and int etc without changing them to nullable. Thanks

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• TreeMap randomly stops properly returning values

  - by smessing

  I have the following TreeMap: TreeMap<String, Integer> distances = new TreeMap<String, Integer>(); and it contains both strings, "Face" and "Foo", with appropriate values, such that: System.out.println(distances); Yields: {Face=12, Foo=2} However, distances.get(Face) returns null, even though distances.get(Foo) properly returns 2. Previously, distances.get(Face) worked, but for some reason, it stopped working. Note I print out the map right before calling get() for both keys, so I haven't accidentally changed Face's value to null. Has anyone else ever encountered this problem? Is there anything I can do? I'm having a terrible time simply trying to figure out how to debug this problem.

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• ArgumentOutOfRangeException at MySql execution. (MySqlConnector .NET)

  - by Lazlo

  I am getting this exception from a MySqlCommand.ExecuteNonQuery(): Index and length must refer to a location within the string. Parameter name: length The command text is as follows: INSERT INTO accounts (username, password, salt, pin, banned, staff, logged_in, points_a, points_b, points_c, birthday) VALUES ('adminb', 'aea785fbcac7f870769d30226ad55b1aab850fb0979ee00481a87bc846744a646a649d30bca5474b59e4292095c74fa47ae6b9b3a856beef332ff873474cc0d3', 'cb162ef55ff7c58c7cb9f2a580928679', '', '0, '0', '0', '0', '0', '0', '2010-04-18') Sorry for the long string, it is a SHA512 hash. I tried manually adding this data in the table from MySQL GUI tools, and it worked perfectly. I see no "out of range" problem in these strings. Does anybody see something wrong?

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