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• Can someone tell me why my dataset wont save correctly to the database in simple winforms app?

  - by Mike

  I have been struggling with this all day and I know it is probably something stupid. My code is below. If I call save then exit my program and start again I can save images to my events but if I just call save when I try to add an image and call save again I get a foreign key error. From what I know I thought my save method was updating the database from my dataset so the event associated with the image should exist. Anyway here is my save method... Private Sub Save() Me.Validate() EventsBindingSource.EndEdit() ImagesBindingSource.EndEdit() TableAdapterManager.UpdateAll(EventDataSet) EventDataSet.AcceptChanges() End Sub Am I doing this wrong? Is this enough detail?

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• JSON from $.each()

  - by Matthew

  I'm trying to get a list of the values of all checked checkboxes that looks like this: foo = { 'colors': ['blue', 'red', 'green'], 'flavors': ['vanilla', 'chocolate'] }; This is the approach I'm taking so far, but JS is saying that 'colors' doesn't exist when I try to push a new value to it. I'm assuming this is a scope issue but I don't know how to fix it. var foo = {}; foo.colors = []; $(".colors:checked").each(function(){ foo.colors.push($(this).val()); });

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• The standard map/associative-array structure to use in flash actionscript 3?

  - by tstyle

  I'm relatively new to flash, and is confused about what I should use to store and retrieve key value pairs. After some googling I've found various map-like things to choose from: 1) Use a Object: var map:Object = new Object(); map["key"] = "value"; The problem is that it seems to lack some very basic features. For example to even get the size of map I'd have to write a util method. 2) Use a Dictionary What does this standard library class provide over the simple object? It seems silly for it to exist if it's functionally identical to Object. 3) Go download some custom HashMap/HashTable implementation from the web. I've used a lot of modern languages, and this is the first time I haven't been able to find a library implementation of an associative array within 5 minutes. So I'd like to get some best-practice advice from an experienced flash developer. Thanks!

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• Why RichTextBox lose format after appending new String?

  - by user556526

  Hi guys I have aproblem with rich text box string color: I have the richtexbox that user type a message in it. I mark up each word that exist in my dictionary. I use this code for it: this.inputTextAreaRtb.Text=this.inputTextAreaRtb.Text.Remove(startCoordinate, endCoordinate - startCoordinate); this.inputTextAreaRtb.SelectionStart = this.inputTextAreaRtb.Text.Length; this.inputTextAreaRtb.SelectionLength = 0; this.inputTextAreaRtb.SelectionFont = new System.Drawing.Font( "David", 12, FontStyle.Underline); this.inputTextAreaRtb.SelectionColor = Color.DarkBlue; this.inputTextAreaRtb.AppendText(_word); this.inputTextAreaRtb.SelectionColor = this.inputTextAreaRtb.ForeColor; this.inputTextAreaRtb.SelectionFont = new System.Drawing.Font( "David", 12, FontStyle.Regular); But each time if I already marked up a word a loose formatting of words that already formatted. Any ideas of this problem?

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• What are good alternatives to SQL (the language)?

  - by Brendan Long

  I occasionally hear things about how SQL sucks and it's not a good language, but I never really hear much about alternatives to it. So, are other good languages that serve the same purpose (database access) and what makes them better than SQL? Are there any good databases that use this alternative language? EDIT: I'm familiar with SQL and use it all the time. I don't have a problem with it, I'm just interested in any alternatives that might exist, and why people like them better. I'm also not looking for alternative kinds of databases (the NoSQL movement), just different ways of accessing databases.

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• Imitating Multiple Inheritance in PHP

  - by fabieno

  I am working on my own MVC framework and found myself stuck. I need the following construction: Controller -- Backend_Controller -- Backend_Crud_Controller -- Frontend_Controller -- Frontend_Crud_Controller Both 'Backend_Crud_Controller' and 'Frontend_Crud_Controller' have the same functionality and thus they should extend another class named 'Base_Crud_Controller', the only difference comes from the 'Backend/Frontend' Controllers which implement different mechanisms. Basically they should inherit both classes but my problem is that 'Backend/Frontend' controller doesn't necessarily extend 'Base_Crud_Controller'. I know multiple inheritance doesn't exist in PHP but I am looking for a solution, I choose to refrain Mixins (like in Symfony) as I don't consider that an elegant solution. Interfaces do not suit me as all of these end up as concrete classes that should implement methods.

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• Interface naming convention

  - by Frederick

  This is a subjective thing of course, but I don't see anything positive in prefixing interface names with an 'I'. To me, Thing is practically always more readable than IThing. My question is, why does this convention exist then? Sure, it makes it easier to tell interfaces from other types. But wouldn't that argument extend to retaining the Hungarian notation, which is now widely censured? What's your argument for that awkward 'I'? Or, more importantly, what could be Microsoft's?

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• How to access a subset of XML data in Java when the XML data is too large to fit in memory?

  - by Michael Jones

  What I would really like is a streaming API that works sort of like StAX, and sort of like DOM/JDom. It would be streaming in the sense that it would be very lazy and not read things in until needed. It would also be streaming in the sense that it would read everything forwards (but not backwards). Here's what code that used such an API would look like. URL url = ... XMLStream xml = XXXFactory(url.inputStream()) ; // process each <book> element in this document. // the <book> element may have subnodes. // You get a DOM/JDOM like tree rooted at the next <book>. while (xml.hasContent()) { XMLElement book = xml.getNextElement("book"); processBook(book); } Does anything like this exist?

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• Linq TakeWhile depending on sum (or aggregate) of elements

  - by martinweser

  I have a list of elements and want to takeWhile the sum (or any aggregation of the elements) satisfy a certain condition. The following code does the job, but i am pretty sure this is not an unusual problem for which a proper pattern should exist. var list = new List<int> { 1, 2, 3, 4, 5, 6, 7 }; int tmp = 0; var listWithSum = from x in list let sum = tmp+=x select new {x, sum}; int MAX = 10; var result = from x in listWithSum where x.sum < MAX select x.x; Does somebody know how to solve the task in nicer way, probably combining TakeWhile and Aggregate into one query? Thx

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• C# compile error for simple Annual Salary Calculator

  - by Mike Vignapiano

  I am new to C# and trying to create my 1st app. I have 3 errors. The first two say that txtSalary and Salary do not exist. The 3rd says that it cannot convert method group 'ToString' to non-delegate type 'string'. and asks if I intend to invoke the method. Here is what I have: protected void Button1_Click(object sender, EventArgs e) { int salary, AnnualHours, Rate; string txtAnnualHours, txtSalary, txtRate; salary = AnnualHours * Rate; txtsalary = int.Parse(Salary); txtAnnualHours = salary.ToString; MessageBox.Show(salary); } According to my book, when you enter numerics in AnnualHours and Rate textbox, when click Button1, these values are converted from string to integers, then multiplied for salary. Then numeric answer converted to string and displayed in messagebox named txtSalary. Please show me what I got wrong because according to the book, I am not missing anything.

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• Mysterious logging.basicConfig problem (Python)

  - by Max

  I'm writing a Python script to retrieve data from Flickr. For logging purposes, I have the following setup function: def init_log(logfile): format = '%(asctime)s - %(levelname)s - %(message)s' logging.basicConfig(filename=logfile,level=logging.DEBUG,format=format) I've tested this using the python shell and it works as expected, creating a file if one doesn't already exist. But calling it from within my program is where it stops working. The function is definitely being called, and the logfile parameter is working properly – logging.basicConfig just isn't creating any file. I'm not even getting any errors or warnings. My use of the Python Flickr API may be the culprit, but I doubt it. Any ideas?

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• Determine if e-mail message can be successfully sent

  - by Felipe Lima

  Hello Everyone, I am working in a mailing application in C# and, basically, I need to be able to determine which recipients successfully received the message, which ones did not, no matter what was the failure reason. In summary, I need an exception to be thrown whenever the email address does not exist, for example. However, SmtpClient.Send does not throw an exception in this case, so I'd need to monitor the delivery failure replies and parse them, maybe. I know this is not a simple task, so I'd ask you experts some tips on how to handle the main issues with email sending. Thanks in advance!!

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• C++/CLI and C#, "Casting" Functions to Delegates, What's the scoop?

  - by Jacob G

  In C# 2.0, I can do the following: public class MyClass { delegate void MyDelegate(int myParam); public MyClass(OtherObject obj) { //THIS IS THE IMPORTANT PART obj.SomeCollection.Add((MyDelegate)MyFunction); } private void MyFunction(int myParam); { //... } } Trying to implement the same thing in C++/CLI, it appears I have to do: MyDelegate del = gcnew MyDelegate(this, MyFunction); obj-SomeCollection-Add(del); Obviously I can create a new instance of the delegate in C# as well instead of what's going on up there. Is there some kind of magic going on in the C# world that doesn't exist in C++/CLI that allows that cast to work? Some kind of magic anonymous delegate? Thanks.

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• Separating merged array of arithmetic and geometric series

  - by user1814037

  My friend asked me an interseting question. Given an array of positive integers in increasing order. Seperate them in two series, an arithmetic sequence and geometric sequence. The given array is such that a solution do exist. The union of numbers of the two sequence must be the given array. Both series can have common elements i.e. series need not to be disjoint. The ratio of the geometric series can be fractional. Example: Given series : 2,4,6,8,10,12,25 AP: 2,4,6,8,10,12 GP: 4,10,25 I tried taking few examples but could not reach a general way. Even tried some graph implementation by introducing edges if they follow a particular sequence but could not reach solution.

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• Start a thread using a method pointer

  - by Michael

  Hi ! I'm trying to develop a thread abstraction (POSIX thread and thread from the Windows API), and I would very much like it to be able to start them with a method pointer, and not a function pointer. What I would like to do is an abstraction of thread being a class with a pure virtual method "runThread", which would be implanted in the future threaded class. I don't know yet about the Windows thread, but to start a POSIX thread, you need a function pointer, and not a method pointer. And I can't manage to find a way to associate a method with an instance so it could work as a function. I probably just can't find the keywords (and I've been searching a lot), I think it's pretty much what Boost::Bind() does, so it must exist. Can you help me ?

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• If and only if condition SQL -- SQL server 2008

  - by user494901

  I'm writing a SQL statement to select a user on a table if that user does not exist on another table, then I want to pull in all their data from another table then I'll be outputting all that in Coldfusion. How do I do this? I have tried, my atempt is below: pro_profile == All employees mod_userStatus == All Professional Staff members I am doing the not exists to remove professional stuff to just get our student staff. mod_StudentCertifications is a listing of the certifications they (students) hold. If we do an AND statement between the where statements it returns no users, or only users that meet both conditions, if we do an OR it will return users with only 1 condition. I need it first Match the not exists then proceed to the exists statement. Is that do able? Here's my Statement: SELECT profileID, firstName, lastName FROM pro_Profile WHERE not exists ( SELECT profileID FROM mod_userStatus WHERE mod_userStatus.profileID = pro_Profile.profileID ) OR exists ( SELECT cprAdultExp, cprInfantChildExp, cprFPRExp, aedExp, firstAidExp, emtExp, waterSafetyInstructionExp, bloodPathogensExp, oxygenAdminExp, lifegaurdingExp, wildernessResponderExp, notes FROM mod_StudentCertifications WHERE mod_StudentCertifications.profileID = pro_Profile.profileID );

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• Android Programmatically created Button Persistence

  - by WtLgi

  So in an app I'm messing around with I programmatically create some buttons. Then I setContentView(); to a different page. Then if I come back to the original page (on which I placed the programmatically created buttons), they no longer exist. I guess this makes sense as I am calling setContentView(R.layout.main); again which is just the original xml file with no data pointing to the buttons. So is there a way to have the buttons persist over such screen transitions? Thanks.

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• How to determine, upon launch, whether the app crashed the last time it quit?

  - by enchilada

  One of the crash reporter frameworks I've found does it like this: If there exist crash reports in the ~/Library/Logs/CrashReporter folder for the app, it determines that a crash occurred before. Then it allows the user to send the developer the crash log. And the finally, it deletes those logs. It is this deletion that is bothering me. It's not acceptable to me. Maybe the user wants to look at those logs later. It is simply rude to the user to just delete his crash logs. So I'm looking for a better way to determine the crash. It doesn't really work to store the last read crash logs in the user defaults or the user data, because that would mean that if the user deletes the data and defaults (which he has a right to do whenever he or she wishes), and then launches the app, it will be detected as crashed the last time it was quit. So this doesn't work. Any ideas?

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• Get file size of BufferedImage before writing the data

  - by David

  I'm working on a Java program that needs to send an image (preferably in PNG format, though I could perhaps use another format if necessary) over the network. The logical way to do this is, of course, to first send the length of the PNG image data, then the data itself. Problem: I don't see any method in ImageIO or anywhere else that will give me the length of the image data. Does this exist somewhere in the Java 1.6 standard library? I know I could just write it to a ByteArrayOutputStream and get the length of the resulting array, but before resorting that I wanted to make sure I'm not missing something built in. And besides, that makes an extra copy of the image data, which I'd rather not do if it's not necessary.

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• Query useing two databases in SQL Report Builder

  - by user912447

  I am new to SQL Server Report Builder 2.0 and I need to compare two different databases in one query. Basically I need to check if values from one database table exist in a different database's table. I know I can add multiple Datasources to my report and access each one with Subreports, but each DataSet that I create can only have one query in it. So how can I go about using one query to access two databases? Or if there is another way to somehow join my results from multiple DataSets, that would work too. Also, the databases are on the same server.

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• Highly efficient filesystem APIs for certain kinds of operations

  - by romkyns

  I occasionally find myself needing certain filesystem APIs which could be implemented very efficiently if supported by the filesystem, but I've never heard of them. For example: Truncate file from the beginning, on an allocation unit boundary Split file into two on an allocation unit boundary Insert or remove a chunk from the middle of the file, again, on an allocation unit boundary The only way that I know of to do things like these is to rewrite the data into a new file. This has the benefit that the allocation unit is no longer relevant, but is extremely slow in comparison to some low-level filesystem magic. I understand that the alignment requirements mean that the methods aren't always applicable, but I think they can still be useful. For example, a file archiver may be able to trim down the archive very efficiently after the user deletes a file from the archive, even if that leaves a small amount of garbage either side for alignment reasons. Is it really the case that such APIs don't exist, or am I simply not aware of them? I am mostly interested in NTFS, but hearing about other filesystems will be interesting too.

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• PHP , What is the difference between fopen r+ and r ! does it matter if i used r+ when not intending

  - by Naughty.Coder

  when I use fopen function , why don't I use r+ always , even when I'm not going to write any thing ... is there a reason for separating writing/reading process from only reading .. like , the file is locked for reading when I use r+ , because i might write new data into it or something ... another question : in php manual a+ : Open for reading and writing; place the file pointer at the end of the file. If the file does not exist, attempt to create it. What is supposed to be read if you are at the end of the file ..(pointer at the end) !!? where to learn more about the filesystem thing .... it's confusing

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• C#: Basic Reflection Class

  - by Mike

  I'm trying to find a basic reflection abstract class that will generate basic information about a class. I have a template of how I would like it to work: class ThreeList<string,Type,T> { string Name {get; set;} Type Type {get; set;} T Value {get; set;} } abstract class Reflect<T> { List<ThreeList<string, Type, T> list; ReturnType MethodName() { foreach (System.Reflection.PropertyInfo prop in this.GetType().GetProperties()) { object value = prop.GetValue(this, new object[] { }); list.Add(prop.Name, prop.DeclaringType, value); } } } I'd like it to be infinitely deep, recursively calling Reflect. Something like this has to exist. I'm not really opposed to coding it myself, I just don't want to go through the hassle if its already been done.

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• NSPredicate aggregate function [SIZE] gives 'unsupported function expression' error

  - by jinglesthula

  iOS 4: I have entities in Core Data (using SQLite, which is a requirement) of: Request Response (which has a property personId) Revision Relationships are: Request <-- Revision Request <-- Response Revision <-- Response (e.g. each request may have many responses; each request/response pair may have many revisions) I'm trying to do a predicate to get all Responses with a given personId that have zero Revisions. Using: (personId == %d) && (Request.Revision[SIZE] == 0) in my predicate string gives me a runtime exception "Unsupported function expression Request.Revision[SIZE]" The documentation seems pretty sparse on aggregate functions, only noting that they exist, but with no syntax or examples. Not sure if it's my syntax or if the SIZE function really isn't supported in iOS.

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• Django: Change models without clearing all data?

  - by Rosarch

  I have some models I'm working with in a new Django installation. Is it possible to change the fields without losing app data? I tried changing the field and running python manage.py syncdb. There was no output from this command. Renavigating to admin pages for editing the changed models caused TemplateSyntaxErrors as Django sought to display fields that didn't exist in the db. I am using SQLite. I am able to delete the db file, then re-run python manage.py syncdb, but that is kind of a pain. Is there a better way to do it?

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