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• Patterns for implementing field change tracking.

  - by David

  Hi all For one of my recent projects, I had to implement field change tracking. So anytime the user changed a value of a field, the change was recorded in order to allow full auditing of changes. In the database, I implemented this as a single table 'FieldChanges' with the following fields: TableName, FieldName, RecordId, DateOfChange, ChangedBy, IntValue, TextValue, DateTimeValue, BoolValue. The sproc saving changes to an object determines for each field whether it has been changed and inserts a record into FieldChanges if it has: if the type of the changed field is int, it records it in the IntValue field in the FieldChanges table, etc. This means that for any field in any table with any id value, I can query the FieldChanges table to get a list of changes. This works quite well but is a bit clumsy. Can anyone else who has implemented similar functionality suggest a better approach, and why they think it's better? I'd be really interested - thanks. David

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• Find Window At Location Using Carbon And Carbon Problems In 64-Bit Applications

  - by JxXx

  As I said in some questions today I´m looking for the way to get window or windowPart references at a certain location. Although I know I could use Cocoa for this purpose (I don´t know how to do it yet) I prefer (and probably need) to do this using Carbon because the entire application that needs this functionality is written in C++ but I´ve found many problems trying it. Does anyone get a valid windowPtr or windowRef using one of the following functions? FindWindow, MacFindWindow, HIWindowFindAtLocation or FindWindowOfClass I always get 0 as the windowRef or windowPtr that I´m looking for. What I´m doing wrong? Any ideas? It´s true that now if you want to create a 64-bit application for Mac OS X, you need to use Cocoa to implement its user interface because some APIs commonly used by Carbon applications are not available in 64-bit applications? Thank you. JxXx

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• WCF Global(.asax) Behavior

  - by Theofanis Pantelides

  Hi, I want to create a global option that when a REST call contains &format=json to output the response as a JSON string. If I enter the following String in my method it works: WebOperationContext.Current.OutgoingResponse.Format = WebMessageFormat.Json; However, if I add this line, anywhere in my Global.asax file, I get a nullException for Current Context: String format = ""; if (HttpContext.Current.Request.QueryString["format"] != null) format = HttpContext.Current.Request.QueryString["format"]; if (String.Equals("json", format, StringComparison.OrdinalIgnoreCase)) System.ServiceModel.Web.WebOperationContext.Current.OutgoingResponse.Format = System.ServiceModel.Web.WebMessageFormat.Json; The exception is triggered here: System.ServiceModel.Web.WebOperationContext.Current Anyone know how I can add this functionality globally (WCF)?

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• Are there alternatives to UltraWinGrid (for C#)?

  - by MPelletier

  I've been using the Infragistics UltraWinGrid for a while in a C# project, and while it's very spiffy, it is sometimes a bit heavy to run (and editing it in Visual Studio can be hazardous). I'm looking for a lighter alternative. Looks (always a big plus with Infragistics) are not as important as functionality. Namely, I'm looking for a beefed up DataGridView which: has data binding (duh!) has lock control over editing allows for sub-tables on opening a row can have multiple headers to group columns together (say header 1 is composed of "Group A" and "Group B", and header 2 has various columns under each group) has sorting by column (and can sort numbers properly, even if it does not have a stock method at first) has filtering by column (perhaps the most demanding spec) à la UltraWinGrid/Excel (text field with a way to specify if the filter is equal, not equal, greater, lesser, starts with, ends with, etc). supports check box, text box or data bound list/combo box cells allows cells to be merged (not the control cells of course!) can have events bound to each row (say double click)

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• Are TClientDataSets part of your toolkit, or have they been replaced by something else?

  - by Tom1952

  I have 50 or 60 records of four or five fields. I need to load the records into RAM (From a CSV file), search on different fields, enumerate, etc. Not a lot of data, not a lot of functionality. I was all excited to use the new (to me in D2010) TDictionary or TList, but thought that a TClientDataset (which I've never used before) might be more appropriate. With a TClientDataSet, I can use .Locate on any field, enumerate with while NOT CDS.EOF, etc. And, what exactly is this MidasLib that I have to use with CDS? Can I reasonably expect it to be supported in the future? Is TClientDataSet still considered state-of-the-art, or is it showing its age and somewhat deprecated (literally and figuratively)? I've seen colleagues use DX's TdxMemData. Why use it (or any of the other handful of memory datasets I've seen while googling this issue) rather than a CDS? Related question: http://stackoverflow.com/questions/274958/delphi-using-tclientdataset-as-an-in-memory-dataset

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• Serialize struct with pointers to NSData

  - by leolobato

  Hey guys, I need to add some kind of archiving functionality to a Objective-C Trie implementation (NDTrie on github), but I have very little experience with C and it's data structures. struct trieNode { NSUInteger key; NSUInteger count, size; id object; __strong struct trieNode ** children; __strong struct trieNode * parent; }; @interface NDTrie (Private) - (struct trieNode*)root; @end What I need is to create an NSData with the tree structure from that root - or serialize/deserialize the whole tree some other way (conforming to NSCoding?), but I have no clue how to work with NSData and a C struct containing pointers. Performance on deserializing the resulting object would be crucial, as this is an iPhone project and I will need to load it in the background every time the app starts. What would be the best way to achieve this? Thanks!

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• Building an automatic web crawler

  - by Sakin

  I am building a web application crawler that's meant not only to find all the links or pages in a web application, but also perform all the allowed actions in the app (such as pushing buttons, filling forms, notice changes in the DOM even if they did not trigger a request etc.) Basically, this is a kind of "browser simulator". I find WebKit a good option to implement my crawler, since it has all the needed technology (Javascript engine, parsers, DOM manipulation, etc.) but it seems kind of an overkill being a fully featured browser. Is there any toolkit you know that can provide the above functionality?

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• Creating a user-defined code generation system in PHP

  - by user270766

  My newest project that I'm looking to build with CodeIgniter would require some sort of system that would allow a user to drag and drop pre-defined functions/methods into mini-classes/objects and then run/test them in the browser. So it'd something similar to Scratch. I've designed a relational database that I think could work for this (storing the function names and have these classes "subscribe" to those functions) - but I'm wondering whether or not to go ahead with it. Is there a better way to do this or is there a system out there that would accomplish this for me? EDIT: It would have to be extremely simple for an end user, but hopefully be flexible enough to easily add more complex functionality in the future.

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• How to Redirect Visual Studio F12 Shortcut Key to Object Browser in C# Project

  - by AMissico

  For C# projects, I would like to have the F12 "Go to Definition" shortcut key to open the Object Browser and select the type under the cursor position. This is the behavior for VB.NET projects, which I really like. I think the Object Browser is more helpful than IntelliSense in some cases. I really do not need a text representation of the metadata. How do I duplicate the F12 / "Go to Definition" functionality in a C# project? Is there a different shortcut key for C#? I am not talking about the Alt+Ctrl+J shortcut key that displays the Object Browser.

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• Extending Perforce to use a custom content diff tool for certain file extensions

  - by Fraser Graham

  I have various custom binary files stored in perforce and for many of the file types I have built a custom diff tool to show the content creators a diff of the actual changes to the file. E.g. If the file holds simple key value pairs as a compressed binary blob the diff tool would load each version into an in memory format and generate a list of additions, deletions and edits to the file presented in a nice clean report view. Much like the built in image diff tool in P4V i'd like to be able to use my own diff tool for certain file extensions within my depot and allow the users to use the existing P4V interface to pick revisions to diff between and examine history. So, I am aware you can write add-ins to P4V but I can't find any documentation on it and I'd like to know if this kind of extension functionality is available in P4V and how to use it?

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• Which is more user friendly: TortoiseGIT or TortoiseHG?

  - by hamishmcn

  I have been experimenting with using Mercurial and TortoiseHG to track my work when I am working remotely (with a slow VPN I don't want to commit to SVN unless I have something that works). I have found TortoiseHG a bit hard to use - or at least it often doesn't work the way I expect it to, so I am considering switching to GIT and TortoiseGIT. (For example I had problems rolling back source code to an earlier version and I still don't know what I did wrong) My question whether they have a similar level of functionality / user friendliness or whether one is better than the other. What has your experience been?

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• C Socket Programming, problems with select() and fd_set

  - by wretrOvian

  Hello I'm learning my way about socket programming in C (referring to Beej). Here is a simple multi-user chat server i'm trying to implement: http://pastebin.com/gDzd0WqP On runtime, it gives Bus Error. It's coming from the lines 68-78. Help me trace the source of the problem? in fact, WHY is my code even REACHING that particular region? I've just run the server. no clients have connected.. :@ ps - i know my code is highly unreliable (no error checks anywhere), but i WILL do that at a later stage, i just want to TEST the functionality of the code before implementing it in all it's glory ;)

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• UIToolbar above UIWebView inside UIScrollView

  - by Nick VanderPyle

  I'd like to display a toolbar above a UIWebView but hide the toolbar until the person "pulls it down". The same functionality can be seen in Safari on the iPhone. When the page loads, the toolbar containing the address is hidden. You must pull it down. In Safari it's possible to scroll up and eventually see the toolbar or scroll down through the page contents. I've tried placing a UIToolbar and UIWebView inside a UIScrollView but it didn't work. I've tried setting the UIScrollView to the size of the toolbar and webview combined, but that didn't work. - (void)viewDidLoad{ CGSize size = CGSizeMake(webView.frame.size.width, toolBar.frame.size.height + webView.frame.size.height); [scrollView setContentSize:size]; } How should I go about doing this?

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• Suggestion for dragster/dropzone like dock menu

  - by Ger Teunis

  I'd like to create a dragster/dropzone like dock menu. Looks a bit like a stack with a nsview in it. After a lot if documentation searching and googling I've found a way to determine a dock icon's location. (http://cocoadev.com/forums/comments.php?DiscussionID=1431) Is nzbdrop creating a view which just looks like an stack to display it's menu or is there a better way of creating this? Additional info: I'm not looking for the drop like functionality just the nice way the DropBox window is displayed as an bubble/stack menu on top of it's app icon.

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• Dynamically building and updating Histograms with JFreeChart

  - by job

  I've got a stream of incoming data that I would like to plot using a simple histogram. I don't know the range of values, or the proper resolution or bin width to use for the histogram. SimpleHistogramDataset provides some of this functionality, but I don't want to have to deal with catching exceptions in order to add new bins if the new value isn't covered. In addition, it doesn't easily allow me to rebuild the histogram using a different bin width (perhaps an integer multiples of some initial set width). Is there an easy way to accomplish this with JFreeChart or some alternate charting library, or am I going to have to write my own class here?

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• Is this the correct way of speaking to a "Content Manager" Class?

  - by DeanMc

  I am creating a silverlight site. I am currently breaking out my ideas into pieces of functionality. One of the idea's I have is the concept of a content manager. This is essentially a UI control with 4 regions. Top, Bottom, Right & Left. I also have a collection of objects that are considered "Menu Items". These are controls that function as a way to navigate around, similar to links. The idea I have is to implement an IMenuItem interface. Among the standard pieces of information (Text, PageReference, etc) I was also going to hold a reference to the content manager. My idea behind this thinking is that I can pass the PageReference to a property on the ContentManager and then call a method which knows how to update the content manager accordingly. Is this the best way of implementing this or is their some sort of pattern for it?

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• How do you implement a combobox filter using AJAX in ASP.NET?

  - by geocine

  To save some time on discussing my problem you could check the demo below: http://demos.telerik.com/aspnet-ajax/combobox/examples/functionality/filteringcombo/defaultcs.aspx I already checked the ListBoxExtender on the Ajax Control Toolkit but it wouldn't give me fine results. What I want to do is to filter a listbox which is populated by over 3000 records from the database upon typing. It should not only filter the listbox with the starting letters but also the group of characters which could be found in between each item on the list. The list is a list of Item Name as a value and an Item Code as the key.

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• Using a C#.net DLL in Node.js / serverside javascript

  - by Dve

  I have spent a while playing with node.js and exploring related frameworks such as express and geddy... and I am very impressed, especially with the WebSockets implementation in socket.io. I have a pet project that is an online game, the entire game engine is written in C# and I would like to know if there is anyway I can call the functions of this existing dll from a solution built using node.js, socket.io, express etc? The game engine itself is pretty complete; tested and robust. I am hoping there is some neat way of exposing its functionality without to much overhead. Thanks

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• Visual Studio Windows Forms Designer keyboard shortcuts

  - by Dan Tao

  Extremely basic question. Are there common actions I can perform using keyboard shortcuts in the Windows Forms designer in Visual Studio (2008)? Alternately, could I add my own keyboard shortcuts (either through settings or macros)? It'd really be nice if I could, for example, set a control to dock/undock in its parent container by typing Alt+D. Or if I could set a control's name just by typing Alt+N and typing the name. Things like that. It's just kind of tedious to click on the item, scroll in the Properties grid to the property I want to change, type the new value, scroll to the next property I want to change, etc. Which is why I have a feeling this functionality is in there already, or is easily configurable, and I just don't know about it.

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• How should one import large amounts of data for FIT/Fitnesse tests?

  - by Lachlan

  We have a scheduling engine with large amounts of test data to test all the scenarios, so test automation is critical. We're currently hoping to use FIT/Fitnesse. However a single test has quite a large table of test data, so it doesn't fit very well into the mould of "two or three inputs, one or more outputs" that Fitnesse uses in its examples. Hopefully the other functionality of Fitnesse makes it worth using it. I hear that there is a way to initialize an application for a FIT test with an Excel spreadsheet - not the Spreadsheet to Fitness function, mind you - but I haven't been able to find it so far. Once the whole spreadsheet is loaded into the application, and the application does its thing, we plan to compare either a number of output rows, or perhaps just the last row, to see if the test passes. The application is currently pulling test data from a database for manual tests, but writing to a database, then initializing from it, is not preferred because of the performance impact. The application is written in C#.

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• Reputable geo-ip location Services

  - by Alan Storm

  Who are some of the reputable and/or stable geo-ip location service providers? I'm specing out an application that needs this functionality, and whenever I google geo-ip I get a ton of hits, but it's hard to tell who the legit providers are and who the fly-by-night folks are. Ideally I'd like something that can run without a call to an external API (i.e. regular database updates), but would be interested in hearing about experience with providers who offer live/http services. If it ran in PHP that would be great, but so long as it could run in a *nix environment that's fine. I'd prefer a paid service from a reputable provider than an awesome free service that could vanish tomorrow (free services are welcome, just convince me they're not going to vanish).

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• How to specify behavior of Java BufferedImage resize: need min for pixel rows instead of averaging

  - by tucuxi

  I would like to resize a Java BufferedImage, making it smaller vertically but without using any type of averaging, so that if a pixel-row is "blank" (white) in the source image, there will be a white pixel-row in the corresponding position of the destination image: the "min" operation. The default algorithms (specified in getScaledInstance) do not allow me a fine-grained enough control. I would like to implement the following logic: for each pixel row in the w-pixels wide destination image, d = pixel[w] find the corresponding j pixel rows of the source image, s[][] = pixel[j][w] write the new line of pixels, so that d[i] = min(s[j][i]) over all j, i I have been reading on RescaleOp, but have not figured out how to implement this functionality -- it is admittedly a weird type of scaling. Can anyone provide me pointers on how to do this? In the worse case, I figure I can just reserve the destination ImageBuffer and copy the pixels following the pseudocode, but I was wondering if there is better way.

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• UIScrollView won't autorotate

  - by clozach

  My app design requires the same scrolling functionality found in the iPhone's native Photos app when browsing photos in full screen. Specifically: Each view snaps into place as the view is swiped Scrolling happens in only one direction Rotating the iPhone rotates the entire scrolling region as well such that the frame of each subview (photos, in Apple's case) rotates in-place and paging is still in the same direction (left-to-right) I started to use Apple's sample PageControl code as a launching point, and everything was going swimmingly until I attempted adding autorotation to the code. My sense from the docs was that all I had to do to get autorotation working was to add this to the sample code's MyViewController.m - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation { return YES; } While that does seem to cause the subviews' backgrounds to rotate, the UILabels and the enclosing UIScrollView stay fixed so that, from a user perspective, paging through the views now requires up/down flicking instead of left/right.

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• Drag/Drop image url in IE

  - by pierre

  I have a requirement in our web app. to allow users to drag an image from an external site and drop it in a text editor they have open in our app. This is, as you'd expect, to let them embed the image in the document (its a rich text editor). In IE 8 this functionality appears to be broken. If I drag/drop, IE uses a relative URL for the 'src' tag on the image - which means I cannot then download the file and store it since I dont know the full address (eg: '../../imgs/myImage.png') Safari and Firefox do not do this; they provides the fully-qualified address (eg: www.mysite.com/imgs/myImage.png). Is this a bug in IE or just WebKit/Mozilla going the extra mile?

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• Javascript: Looking for a script that will allow me to scroll content sideways

  - by lewisqic

  Hi All, I'm trying to find some javascript code that I can embed on my website that will allow me to scroll content from left to right or right to left. This script here: http://www.dynamicdrive.com/dynamicindex11/scrollc2.htm Has the basic functionality that I am looking for, but it scrolls content from top to bottom. I want to be able to scroll my content sideways and have it scroll when I hover over some arrows just like the above mentioned script does. Does anyone know of anything that will work for me? Or perhaps it would be simple to modify the above mentioned script to scroll side to side. Thanks.

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