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• Is there an online tester for xPath selectors?

  - by alex

  I know there are some online regex evaluators.. very useful, matching in real time. They are like web applications of RegexBuddy. I was wondering if there is a similar thing for xPath selectors? I am just learning them and it would be valuable to me. Is there an online tester that allows you to input XML and then an xPath selector and match (live would be better, but I doubt someone has written a JavaScript interpreter?) them? Thanks

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• What non-programming books should programmers read?

  - by Charles Roper

  This is a poll asking the Stackoverflow community what non-programming books they would recommend to fellow programmers. Please read the following before posting: Please post only ONE BOOK PER ANSWER. Please search for your recommendation on this page before posting (there are over NINE PAGES so it is advisable to check them all). Many books have already been suggested and we want to avoid duplicates. If you find your recommendation is already present, vote it up or add some commentary. Please elaborate on why you think a given book is worth reading from a programmer's perspective. This poll is now community editable, so you can edit this question or any of the answers. Note: this article is similar and contains other useful suggestions.

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• Install multiple iPhone apps at once from Xcode to device

  - by Dimitris

  Supposing we have an Xcode iPhone project with 2 targets, is it possible to build and install both of them on the device with one click? Of course, I understand we will not be able to "build and run" both, but can we at least install them? And to extend this concept a bit a bit: are there any scripts to achieve the same thing but with multiple iPhone projects instead of multiple targets in one project? This would be useful when you want to load all your apps on a new development device and don't want to go through all your projects one by one and install.

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• DRY programming dilemma

  - by fayer

  the situation is like this: im creating a Logger class that can write to a file but the write_to_file() function is in a helper class as a static function. i could call that function but then the Log class would be dependent to the helper class. isn't dependency bad? but if i can let it use a helper function then what is the point of having helper functions? what should one prioritize here: using helper functions and have to include this helper class everywhere (but the other 99 methods wont be useful) or just copy and paste into the Log class (but then if i have done this 100 times and then make a change i have to change in 100 places). share your thoughts and experience!

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• Application.Current.Shutdown() vs. Application.Current.Dispatcher.BeginInvokeShutdown()

  - by Daniel Rose

  First a bit of background: I have a WPF application, which is a GUI-front-end to a legacy Win32-application. The legacy app runs as DLL in a separate thread. The commands the user chooses in the UI are invoked on that "legacy thread". If the "legacy thread" finishes, the GUI-front-end cannot do anything useful anymore, so I need to shutdown the WPF-application. Therefore, at the end of the thread's method, I call Application.Current.Shutdown(). Since I am not on the main thread, I need to invoke this command. However, then I noticed that the Dispatcher also has BeginInvokeShutdown() to shutdown the dispatcher. So my question is: What is the difference between invoking Application.Current.Shutdown(); and calling Application.Current.Dispatcher.BeginInvokeShutdown();

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• URLCache - iPhone SDK

  - by Kevin

  Hello everyone.. I need some help in using the NSURLCache to download a simple file. It would need to be saved in the Documents folder of the app. I have seen the URLCache example that apple presented, but I didn't find it useful since it was an image that was being shown. In addition there was some complex code on the modification date. I actually need something when the application opens it will begin the download process. Can someone guide me through just the download process of any file? Thanks Kevin

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• Is Firefox less vulnerable to exploit when running NoScript?

  - by PP

  The article titled "iPhone, IE, Firefox, Safari get stomped at hacker contest" at The Register website discusses that Firefox can be exploited. I wonder if NoScript protects against the kind of exploits written about; or whether the browser can be exploited regardless of having the extension loaded. Any opinions? Might make this a community wiki given that it's not simple problem/solution post.

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• The Community-Driven GDB Primer

  - by fbrereto

  I was reading this question and realized it might be helpful for entry- and pro-level developers alike (including myself) to have a common reference for best practices in using gdb. Many questions asked on Stack Overflow could easily be solved by taking some time to step some code in a debugger, and it would be good to have a community-approved resource to "teach them how to fish", so to speak. Even for those seasoned veterans who occasionally find themselves in gdb when they are accustomed to a GUI-tastic debugger might benefit from those who are much more familiar with the command line tool. For starters (both to gdb and to prime this thread) I submit: Ninefinger's gdb primer The gdb quick reference guide, which is useful for telling you what commands are available but not how best to use them. My hope is this thread is a seed planted that is of continued value to the community. If by "continued value" the community decides to nix it altogether, well then the masses have spoken.

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• Multi Select Checkbox using ListView

  - by Parsa

  I have a CheckBox in the header of ListView. I write a code to select all Checkboxes in ItemTemplate automatically when the user select the checkBox in the header of ListView. This code is useful, when you bind your ListView in DataPager_PreRender. protected void DataPager1_PreRender(object sender, EventArgs e) { //get the user id of the current user Guid userGuid = (Guid)Membership.GetUser().ProviderUserKey; ListView1.DataSource = MyClass.MyStaticMethod(userGuid.ToString()); ListView1.DataBind(); } protected void ListView1_ItemCreated(object sender, ListViewItemEventArgs e) { //Find the checkBox in each Row CheckBox checkBoxRow = e.Item.FindControl("CheckBoxRow") as CheckBox; //Assign the value of checkBoxHeader to the checkBoxRow checkBoxRow.Checked = CheckBoxHeader.Checked; } protected void ListView1_PagePropertiesChanged(object sender, EventArgs e) { // assign false value to the CheckBoxHeader when user click on the DataPager // so if checkboxheader is true in the page 1, when user select Page 2,this check box will be false // therefore all checkbox rows will be false in the new page. if (CheckBoxHeader.Checked == true) CheckBoxHeader.Checked = false; }

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• POSIX threads and signals

  - by Donal Fellows

  I've been trying to understand the intricacies of how POSIX threads and POSIX signals interact. In particular, I'm interested in: What's the best way to control which thread a signal is delivered to (assuming it isn't fatal in the first place)? What is the best way to tell another thread (that might actually be busy) that the signal has arrived? (I already know that it's a bad idea to be using pthread condition variables from a signal handler.) For reference about why I want this, I'm researching how to convert the TclX package to support threads, or to split it up and at least make some useful parts support threads. Signals are one of those parts that is of particular interest.

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• Can Mac KeyNote presentations exported for Windows be shown in good quality and be edited?

  - by Edward Tanguay

  A friend asked me this: ...I stopped using KeyNote for one simple reason – contrary to the Mac marketing blurb, the final presentations do NOT work fine on Windows PCs – they look distorted and have formatting quirks which cannot be corrected because the Windows/Powerpoint file it has supposedly been saved as is in fact a non-editable file, kind of like a pdf. Is there a way to create Mac KeyNote presentation files so they look nice on Windows and can be edited?

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• How can I archive a 30GB file?

  - by Joel Coehoorn

  I have a zip 30GB zip file containing an archive of digital materials available in the school library that I want to burn to dvd. Of course, 30Gb is far too large for a single dvd and the content is already zipped. I'm open to ideas, but leaning towards suggestions that will help me automatically spread the file over multiple dvds, including a simple program to stitch it back together again later.

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• Cron - run task every 90 min.

  - by Cory J

  Trying to adjust a cron job to run every 90 min. It was previously running every 20 min, which was a simple cron job: */20 * * * * whatever To change it to every 90, it seems like I need to split it into 2 jobs, I've done this: 0 0,3,6,9 * * * whatever 30 1,4,7,10 * * * whatever Is this right? The job doesn't seem to kick off.

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• Make Apache server available on a LAN via custom ServerName

  - by samwatt

  Hi, is it possible to set up an Apache server on a machine which is part of a LAN, then allow machines on the LAN to access the server via a custom ServerName (instead of Localhost). I want to serve a simple website in an office space using a short ServerName (no ports etc if possible), but I want to make sure this is possible (after originally being certain it was!). THanks in advance.

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• Url encode and routing?

  - by Curtis White

  I'm using custom routing in a web forms context. I have some titles (part of my custom route) that have say a question mark character. When I URL encode this text ("Question?") and then pass into my route, I get an HTTP ERROR CODE 400. Apparently, the URL encoded text is somehow confusing the routing manager. Can someone provide context and explanation for this? Beyond that, I'm thinking I don't need to URL encode these route data but merely strip out the problem characters. Are there any security risks to not using URL decode/encode? And what are the problem characters? A list would be useful. Thanks!

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• Database independent row level security solution

  - by Filip

  Hi, does anybody knows about Java/C# database independent authorization library. This library should support read, write, delete, insert actions across company organizational structure. Something like this: - user can see all documents - user can enter new document assigned to his unit - user can change all documents assigned to his unit and all subordinate units. - user can delete documents that are assigned to him I should also be able to create custom actions (besides read, write,...) connect them to certain class and assign that "security token" to user (e.g. document.expire). If there aren't any either free or commercial libraries, is there a book that could be useful in implementing this functionality? Thanks.

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• How to discover if a specific address/port is reachable?

  - by marco.ragogna

  I need a simple utility that allow me to check if a PC, attached to a local network, is able to reach a specified address:port using specified protocol like TCP or UDP Machine's OS I will use to do the check is Windows XP. Can you help me, please?

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• Unique ways to use the Null Coalescing operator

  - by Atomiton

  I know the standard way of using the Null coalescing operator in C# is to set default values. string nobody = null; string somebody = "Bob Saget"; string anybody = ""; anybody = nobody ?? "Mr. T"; // returns Mr. T anybody = somebody ?? "Mr. T"; // returns "Bob Saget" But what else can ?? be used for? It doesn't seem as useful as the ternary operator, apart from being more concise and easier to read than: nobody = null; anybody = nobody == null ? "Bob Saget" : nobody; // returns Bob Saget So given that fewer even know about null coalescing operator... Have you used ?? for something else? Is ?? necessary, or should you just use the ternary operator (that most are familiar with)

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• Registration-Free .net libraries with legacy VB6 applications

  - by Vidar

  I've been searching for hours for resources on how to successfully use registration free Com interop. I've found some resources on using old COM libraries in .net applications, but allmost nothing on using new .NET libraries in COM applications (more spcecific: VB6 applications) Basically my search gave two useful resources: http://msdn.microsoft.com/en-us/library/ms973915.aspx (Walkthrough by Steve Wight) There is allso the main MSDN article on the subject (No link because this is my first post, and I am only allowed one link) Is nobody else doing this, or am I the only one struggling to get my head around it? Any good reads will be very much appreciated

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• How can I use an Ant foreach iteration with values from a file?

  - by Egon Willighagen

  In our Ant build environment, I have to do the same task for a number of items. The AntContrib foreach task is useful for that. However, the list is in a parameter, where I actually have the list in a file. How can I iterate over items in a file in an foreach-like way in Ant? Something like (pseudo-code): <foreach target="compile-module" listFromFile="$fileWithModules"/> I'm happy to write a custom Task, and welcome any suggestion on possible solutions.

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• Combining Hg Commits Before Pushing?

  - by Rob

  Let's say I am working on a feature branch cloned from an hg repository - I make some commits and then push the changes back to the repository as expected. However, is there any way to combine multiple commits into a single changeset for the push? For example, today I committed some changes and then remembered I hadn't updated the README file - which meant a 'single' set of changes actually consisted of 2 commits to my local repository. When I pushed these changes back to the original repository it would of been useful to combine the two as a single entity to save cluttering up the repository history.

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• Non-reentrant C# timer

  - by Oak

  I'm trying to invoke a method f() every t time, but if the previous invocation of f() has not finished yet, wait until it's finished. I've read a bit about the available timers (this is a useful link) but couldn't find any good way of doing what I want, save for manually writing it all. Any help about how to achieve this will be appreciated, though I fear I might not be able to find a simple solution using timers. To clarify, if x is one second, and f() runs the arbitrary durations I've written below, then: Step Operation Time taken 1 wait 1s 2 f() 0.6s 3 wait 0.4s (because f already took 0.6 seconds) 4 f() 10s 5 wait 0s (we're late) 6 f() 0.3s 7 wait 0.7s (we can disregard the debt from step 4) Notice that the nature of this timer is that f() will not need to be safe regarding re-entrance, and a thread pool of size 1 is enough here.

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• Why is XCode Organizer console sometimes empty when I connect my iPhone

  - by toofah

  When testing my iPhone app I have found it incredibly useful to log information to the console window. I think it is amazing that I can send out an adhoc build to my co-workers and if they experience problems I am able to plug their iPhone into my mac and grab their console output. However, sometimes the console window is blank when we do this. Why is this the case? The code has been built with logging enabled. Besides that, it seems that the console output, when I see it, contains information about not only my app, but other iphone system logging. Thanks for any insight you can provide.

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• What are the good alternatives to Windows Movie Maker in Vista?

  - by GeneQ

  Short of getting a Mac and using iMovie, what are the alternatives that you'll recommend to a non-profit organization that needs to produce simple (but polished) videos to showcase their community service activities to raise funds. Currently they are using Windows Movie Maker but have sort of outgrown it. I installed Jashaka for them, and understandably, they couldn't grok it at all. Their current system is powerful enough to handle most video editing tasks.

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• Python: Why is IDLE so slow?

  - by Adam Matan

  Hi, IDLE is my favorite Python editor. It offers very nice and intuitive Python shell which is extremely useful for unit-testing and debugging, and a neat debugger. However, code executed under IDLE is insanely slow. By insanely I mean 3 orders of magnitude slow: bash time echo "for i in range(10000): print 'x'," | python Takes 0.052s, IDLE import datetime start=datetime.datetime.now() for i in range(10000): print 'x', end=datetime.datetime.now() print end-start Takes: >>> 0:01:44.853951 Which is roughly 2,000 times slower. Any thoughts, or ideas how to improve this? I guess it has something to do with the debugger in the background, but I'm not really sure. Adam

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