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• How to Practice Unix Programming in C?

  - by danben

  After five years of professional Java (and to a lesser extent, Python) programming and slowly feeling my CS education slip away, I decided I wanted to broaden my horizons / general usefulness to the world and do something that feels more (to me) like I really have an influence over the machine. I chose to learn C and Unix programming since I feel like that is where many of the most interesting problems are. My end goal is to be able to do this professionally, if for no other reason than the fact that I have to spend 40-50 hours per week on work that pays the bills, so it may as well also be the type of coding I want to get better at. Of course, you don't get hired to do things you haven't dont before, so for now I am ramping up on my own. To this end, I started with K&R, which was a great resource in part due to the exercises spread throughout each chapter. After that I moved on to Computer Systems: A Programmer's Perspective, followed by ten chapters of Advanced Programming in the Unix Environment. When I am done with this book, I will read Unix Network Programming. What I'm missing in the Stevens books is the lack of programming problems; they mainly document functionality and provide examples, with a few end-of-chapter questions following. I feel that I would benefit much more from being challenged to use the knowledge in each chapter ala K&R. I could write some test program for each function, but this is a less desirable method as (1) I would probably be less motivated than if I were rising to some external challenge, and (2) I will naturally only think to use the function in the ways that have already occurred to me. So, I'd like to get some recommendations on how to practice. Obviously, my first choice would be to find some resource that has Unix programming challenges. I have also considered finding and attempting to contribute to some open source C project, but this is a bit daunting as there would be some overhead in learning to use the software, then learning the codebase. The only open-source C project I can think of that I use regularly is Python, and I'm not sure how easy that would be to get started on. That said, I'm open to all kinds of suggestions as there are likely things I haven't even thought of.

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• Using Utl_mail package to send email on Oracle 10g grid.

  - by Amol

  Can somebody please advice using special character in message body is allowed or not? I am using a word "month's" in the nessage body but it is getting replaced by "month?s" in the email. Please HELP!!!!

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• Anyone used the Ruby Nettica gem?

  - by Chad

  Has anyone used the Ruby Nettica gem to add an A-record to their DNS file on Nettica? I am continually getting 404 errors but I know that my user/pass creds are correct and I know the domain exists! Thanks for any help. Chad

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• Populating ComboBoxDataColumn items and values

  - by MarceloRamires

  I have a "populate combobox", and I'm so happy with it that I've even started using more comboboxes. It takes the combobox object by reference with the ID of the "value set" (or whatever you want to call it) from a table and adds the items and their respective values (which differ) and does the job. I've recently had the brilliant idea of using comboboxes in a gridview, and I was happy to notice that it worked JUST LIKE a single combobox, but populating all the comboboxes in the given column at the same time. ObjComboBox.Items.Add("yadayada"); //works just like ObjComboBoxColumn.Items.Add("blablabla"); But When I started planning how to populate these comboboxes I've noticed: There's no "Values" property in ComboBoxDataColumn. ObjComboBox.Values = whateverArray; //works, but the following doesn't ObjComboBoxColumn.Values = whateverArray; Questions: 0 - How do I populate it's values ? (I suspect it's just as simple, but uses another name) 1 - If it works just like a combobox, what's the explanation for not having this attribute ? -----[EDIT]------ So I've checked out Charles' quote, and I've figured I had to change my way of populating these bad boys. Instead of looping through the strings and inserting them one by one in the combobox, I should grab the fields I want to populate in a table, and set one column of the table as the "value", and other one as the "display". So I've done this: ObjComboBoxColumn.DataSource = DTConfig; //Double checked, guaranteed to be populated ObjComboBoxColumn.ValueMember = "Code"; ObjComboBoxColumn.DisplayMember = "Description"; But nothing happens, if I use the same object as so: ObjComboBoxColumn.Items.Add("StackOverflow"); It is added. There is no DataBind() function. It finds the two columns, and that's guaranteed ("Code" and "Description") and if I change their names to nonexistant ones it gives me an exception, so that's a good sign. -----[EDIT]------ I have a table in SQL Server that is something like code  |  text —————    1    | foo    2    | bar It's simple, and with other comboboxes (outside of gridviews) i've successfully populated looping through the rows and adding the texts: ObjComboBox.Items.Add(MyDataTable.Rows[I]["MyColumnName"].ToString()); And getting every value, adding it into an array, and setting it like: ObjComboBox.Values = MyArray; I'd like to populate my comboboxColumns just as simply as I do with comboboxes.

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• Apple push notifications could not receive size of message error

  - by embedded

  I'm trying to send some push notification message to my App using the sandbox option. I'm getting those messages on my console: Sun Apr 25 21:56:22 unknown /usr/libexec/notification_proxy[57] : Could not receive size of message Sun Apr 25 21:56:22 unknown /usr/libexec/notification_proxy[57] : Could not receive message How do I resolve this? Thanks

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• SQL server connectivity using ConfigurationManager.ConnectionString

  - by Devashri

  I am not able to use String connectionString = ConfigurationManager.ConnectionStrings["DevBackup"].ConnectionString; I am getting error 'The name 'ConfigurationManager' does not exist in the current context' I have used namespaces using System.Data.SqlClient; using System.Data.Sql; what should be done..?? Am I missing something..??

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• PHP: Script for generating Crossword game?

  - by Prashant

  I need an script for generating crossword game. I have a list of 8 words for which I wnat to generate a crossword game, let's say for 15 column and 15 row. I am not getting the concept of this problem. How to generate this using PHP ?? Can anyone tell me how to do that ??

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• how select all cell while selected JTable value?

  - by Venkats

  First i gave all values of row in JTAble. While inserting table values into database, I selected all values of row in JTable, using the following model.getValueAt(rowIndex,colIndex); But this method gets all the columns except the last inserted column in a row. If i pressed enter key, after getting all values it done well. How to get all columns in a row with out pressed enter key?

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• Scrapy domain_name for spider

  - by Zeynel

  From the Scrapy tutorial: domain_name: identifies the Spider. It must be unique, that is, you can’t set the same domain name for different Spiders. Does this mean that domain_name must be a valid domain name, like domain_name = 'example.com' Or can I name domain_name = 'ex1' The problem is I had a spider that worked with domain name domain_name = 'whitecase.com' Now I created a new spider as an instance of CrawlSpider and named it domain_name = 'wc2' but I am getting the error "could not find spider for domain "wc2""

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• include line numbers in stack trace without pdb?

  - by JoelFan

  We are currently distributing a WinForms app without .pdb files to conserve space on client machines and download bandwidth. When we get stack traces, we are getting method names but not line numbers. Is there any way to get the line numbers without resorting to distributing the .pdb files?

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• Facebook Connect application page Errors while loading page from application

  - by Lily

  Hi I am getting this error from my Facebook Application profile page Errors while loading page from application The URL is not valid. Please try again later. We appreciate your patience as the developers of SocialAnalysis and Facebook resolve this issue. Thanks! The application page is http://www.facebook.com/apps/application.php?id=333786146530 and when I try to go to the application, it gives me that error

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• Android: How to prevent image from being scaled in ImageView or ImageButton?

  - by user277827

  Hi, How can I prevent my bitmap from being scaled automatically in an ImageView or ImageButton if the view or button is stretched using "fill_parent" or using "weight"? This will be useful, for example, to create a 4-button toolbar at the top of the screen where the buttons are equally spaced, but the images inside the buttons keep getting streched even if I use scaleType="center", which should prevent scaling according to the doc, but it doesn't. Any insight is appreciated! Thanks,

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• Can SpringSource Tool Suite build compliant EARs for WebSphere 6.1?

  - by bart

  I read on the website that SpringSource Tool Suite has build targets for WebSphere. Flexible Deployment Targets Support for all the most common Java EE application servers At the moment we are getting grief from infrastructure as we are giving them WARs built in ant. They are used to taking EAR files built straight out of RAD or RSA. Does SS Tool Suite have the capability to build compliant EARs for Websphere 6.1?

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• Could not load the following font issue in ireports

  - by Purushotham

  We have our own fonts for our application. We are using Windows Vista operating system to develop the Reports using iReport. We are using iReports 3.7.1. I kept all my fonts in a folder in C:\ drive. I gave fonts path in iReport. Still I am getting 'Could not load the font' error while generating the report. The same worked fine on Windows 2000 and with iReport 2.x versions.

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• Changing models in django results in broken database?

  - by Rhubarb

  I have added and removed fields in my models.py file and then run manage.py syncdb. Usually I have to quit out of the shell and restart it before syncdb does anything. And then even after that, I am getting errors when trying to access the admin pages, it seems that certain new fields that I've added still don't show up in the model: Caught an exception while rendering: no such column: mySite_book.Title

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• Moving from php4 to php5

  - by fastcodejava

  I tried moving to php5, I am getting into lot of issues. This class gives error : Class DatabaseConnection { // error here private $connection; private $result; // public function __construct() { $this->databaseName = $GLOBALS['configuration']['db']; } // other methods follow }

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• Why instantiation of static nested class object is allowed?

  - by Parag Meshram

  I have started learning Java language for Android Application developement. As per my understanding based on static class, we cannot instantiate object of static class. But why instantiation of static nested class object is allowed in following situaltion? class EnclosingClass { //... class static StaticInnerClass { //... } } Why we can create object of inner class if it is marked as static? EnclosingClass.StaticInnerClass s = new EnclosingClass.StaticInnerClass()

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• jQuery CSS plugin that returns computed style of element to pseudo clone that element?

  - by Keith Bentrup

  I'm looking for a way using jQuery to return an object of computed styles for the 1st matched element. I could then pass this object to another call of jQuery's css method. For example, with width, I can do the following to make the 2 divs have the same width: $('#div2').width($('#div1').width()); It would be nice if I could make a text input look like an existing span: $('#input1').css($('#span1').css()); where .css() with no argument returns an object that can be passed to .css(obj). (I can't find a jQuery plugin for this, but it seems like it should exist. If it doesn't exist, I'll turn mine below into a plugin and post it with all the properties that I use.) Basically, I want to pseudo clone certain elements but use a different tag. For example, I have an li element that I want to hide and put an input element over it that looks the same. When the user types, it looks like they are editing the element inline. I'm also open to other approaches for this pseudo cloning problem for editing. Any suggestions? Here's what I currently have. The only problem is just getting all the possible styles. This could be a ridiculously long list. jQuery.fn.css2 = jQuery.fn.css; jQuery.fn.css = function() { if (arguments.length) return jQuery.fn.css2.apply(this, arguments); var attr = ['font-family','font-size','font-weight','font-style','color', 'text-transform','text-decoration','letter-spacing','word-spacing', 'line-height','text-align','vertical-align','direction','background-color', 'background-image','background-repeat','background-position', 'background-attachment','opacity','width','height','top','right','bottom', 'left','margin-top','margin-right','margin-bottom','margin-left', 'padding-top','padding-right','padding-bottom','padding-left', 'border-top-width','border-right-width','border-bottom-width', 'border-left-width','border-top-color','border-right-color', 'border-bottom-color','border-left-color','border-top-style', 'border-right-style','border-bottom-style','border-left-style','position', 'display','visibility','z-index','overflow-x','overflow-y','white-space', 'clip','float','clear','cursor','list-style-image','list-style-position', 'list-style-type','marker-offset']; var len = attr.length, obj = {}; for (var i = 0; i < len; i++) obj[attr[i]] = jQuery.fn.css2.call(this, attr[i]); return obj; } Edit: I've now been using the code above for awhile. It works well and behaves exactly like the original css method with one exception: if 0 args are passed, it returns the computed style object. As you can see, it immediately calls the original css method if that's the case that applies. Otherwise, it gets the computed styles of all the listed properties (gathered from Firebug's computed style list). Although it's getting a long list of values, it's quite fast. Hope it's useful to others.

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• howto use JFormattedTextField allowing only letters and numbers

  - by Erik

  I have this code and cannot get MaskFormatter right maskformatter MaskFormatter formatter = null; try { formatter = new MaskFormatter("HHHHHHH"); } catch (ParseException e) { e.printStackTrace(); } txtTroll = new JFormattedTextField(formatter); I need Any hex character (0-9, a-f or A-F) and the "H" should give me only (0-9, a-f or A-F) but im getting it wrong. When i type text only capital letters are typed and it's slow to and when i click away from the txtTroll all letters vanish

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• Building OpenSSL on Android NDK

  - by Soumya Simanta

  Hi, I want to use DTLS (on OpenSSL) using JNI on Android 2.1/2.2. Can someone help me get started (tutorials, howto, pointers etc) with building OpenSSL for Android (2.1/2.2) using the Android NDK? Anything important that I should be aware of before doing it. Thanks.

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• pass value through url

  - by shishir.bobby

  hi all, i hv a question. my url is some thing like this http://www.google.com?to=shishir&from=friend and i hv 2 textfeild from where i m getting value of to and from. i need to set those values of 2 textfeiilds into the URL to="values from textfeild" from="value from textfeild" to create a somewhat called a dynamic URL. how can i do it quick reply is always appreciated regards shishir

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• Doctrine toarray does not convert relations.

  - by terrani

  Hi, so..I followed doctrine documnetation to get started. Here is the documentation http://www.doctrine-project.org/documentation/manual/1_2/en/working-with-models#dealing-with-relations:retrieving-related-records My code is $User = Doctrine_Core::getTable("User")->find(1); when I access relations by $User-Phonenumbers, it works. When I convert User object to array by using toArray() method, it does not convert relations to array. It simply display $User data. Am i missing something?

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• How to create nested macro in BOO

  - by Neo

  Hi, I am creating nested macros in BOO, I wrote this program: macro text: macro subMacro: text["Text"] = "Hello World" return [| block: System.Console.WriteLine( "Hello World" ); |] But I am getting the error "Unknown Identifer: 'text'" in the 3rd line of the code.

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• Visual Studio 2010 color theme

  - by James Jones

  Has anyone found/made any decent color themes for Visual Studio 2010? My VS 2005/2008 themes seem to be getting mangled in the upgrade process. I'm accustomed to using the ever famous Oren Ellenbogen's Dark Scheme featured on Scott Hanselman's blog, but the upgrade process has made it downright butt-ugly. Does anyone have any gems they'd like to share?

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• 407 Proxy Authentication Required

  - by Neo

  getting following exception while making call using XMLHttp object asynchronously in mozila firefox. can anybody help me to resolve this issue? 407 Proxy Authentication Required The ISA Server requires authorization to fulfil the request. Access to the Web Proxy filter is denied.

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