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  • Draw arrow on line algorithm

    - by nunos
    Does anyone have an algorithm for drawing an arrow in the middle of a given line. I have searched for google but haven't found any good implementation. P.S. I really don't mind the language, but it would be great if it was Java, since it is the language I am using for this. Thanks in advance.

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  • How to use a defined struct from another source file?

    - by sasayins
    Hi, I am using Linux as my programming platform and C language as my programming language. My problem is, I define a structure in my main source file( main.c): struct test_st { int state; int status; }; So I want this structure to use in my other source file(e.g. othersrc.). Is it possible to use this structure in another source file without putting this structure in a header? Thanks

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  • When to use closure?

    - by shahkalpesh
    I have seen samples of closure from - http://stackoverflow.com/questions/36636/what-is-a-closure Can anyone provide simple example of when to use closure? Specifically, scenarios in which closure makes sense? Lets assume that the language doesn't have closure support, how would one still achieve similar thing? Not to offend anyone, please post code samples in a language like c#, python, javascript, ruby etc. I am sorry, I do not understand functional languages yet.

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  • Showing IPhone keyboard in different languages based on user input.

    - by itsaboutcode
    Hi, My question is related to the following question, and can be said almost same. http://stackoverflow.com/questions/330542/setting-the-iphone-keyboard-language But here are my requirement. I am writing dictionary app for IPhone, which support multiple languages. So my requirement is to display the English keyboard when user has selected English language and show Dutch keyboard when user has selected Dutch and so on. So i was wondering if this is possible? Thanks.

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  • Easiest Way To Get Started In Dot Net

    - by Avery Payne
    Ok, so the initial search in StackOverflow shows nothing related for this question. So here it goes: Let's pretend for a moment that you're just getting started in a career in computer programming. Let's say that, for whatever reason, you decide to use the .Net framework as a basis for your programming. Let's also say that you've been exposed to some programming background, but not one in .Net, so it seems foreign to you at first. And lastly, you don't have the benefit of 25 years of exposure to the Win32 API, which explains why it seems so foreign to you when you start looking at it. So the questions are: What is a comprehensive overview of what .Net is? It appears to be a combination of a runtime environment, a set of languages, a common set of libraries, and perhaps a few other things...so it's about as clear as mud. Specifically, what are the key components to .Net? What is the easiest way to understand .Net programming with regard to available APIs? Which language would best suit beginning programming out of the "stock" languages that Microsoft has to offer? (C++, C#, VB, etc.) What are some differences between .Net programming and programming in a procedural language (aka Pascal, Modula, etc.) What are some differences between .Net programming and programming in a "traditional" object-oriented language? (aka Smalltalk, Java, Python, Ruby, etc.) As I currently understand it, the CLR provides a foundation for all of the other languages to run on. What are some of the inherent limitations of the CLR? Given the enormous amount of API to cover, would it even be worth learning a .Net language (using the Microsoft APIs) given that you would not have prior exposure to Win32 programming? Let's say you write a for-profit program with .Net. Can you resell the program without running afoul of licensing issues? Let's say you write a gratis (free) program with .Net. Can you offer the program to the public under a "free" license (GPL, BSD, Artistic, etc.) without running afoul of licensing issues? Thank you in advance for your patience.

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  • Code Golf: Evaluating Mathematical Expressions

    - by Noldorin
    Challenge Here is the challenge (of my own invention, though I wouldn't be surprised if it has previously appeared elsewhere on the web). Write a function that takes a single argument that is a string representation of a simple mathematical expression and evaluates it as a floating point value. A "simple expression" may include any of the following: positive or negative decimal numbers, +, -, *, /, (, ). Expressions use (normal) infix notation. Operators should be evaluated in the order they appear, i.e. not as in BODMAS, though brackets should be correctly observed, of course. The function should return the correct result for any possible expression of this form. However, the function does not have to handle malformed expressions (i.e. ones with bad syntax). Examples of expressions: 1 + 3 / -8 = -0.5 (No BODMAS) 2*3*4*5+99 = 219 4 * (9 - 4) / (2 * 6 - 2) + 8 = 10 1 + ((123 * 3 - 69) / 100) = 4 2.45/8.5*9.27+(5*0.0023) = 2.68... Rules I anticipate some form of "cheating"/craftiness here, so please let me forewarn against it! By cheating, I refer to the use of the eval or equivalent function in dynamic languages such as JavaScript or PHP, or equally compiling and executing code on the fly. (I think my specification of "no BODMAS" has pretty much guaranteed this however.) Apart from that, there are no restrictions. I anticipate a few Regex solutions here, but it would be nice to see more than just that. Now, I'm mainly interested in a C#/.NET solution here, but any other language would be perfectly acceptable too (in particular, F# and Python for the functional/mixed approaches). I haven't yet decided whether I'm going to accept the shortest or most ingenious solution (at least for the language) as the answer, but I would welcome any form of solution in any language, except what I've just prohibited above! My Solution I've now posted my C# solution here (403 chars). Update: My new solution has beaten the old one significantly at 294 chars, with the help of a bit of lovely regex! I suspected that this will get easily beaten by some of the languages out there with lighter syntax (particularly the funcional/dynamic ones), and have been proved right, but I'd be curious if someone could beat this in C# still. Update I've seen some very crafty solutions already. Thanks to everyone who has posted one. Although I haven't tested any of them yet, I'm going to trust people and assume they at least work with all of the given examples. Just for the note, re-entrancy (i.e. thread-safety) is not a requirement for the function, though it is a bonus. Format Please post all answers in the following format for the purpose of easy comparison: Language Number of characters: ??? Fully obfuscated function: (code here) Clear/semi-obfuscated function: (code here) Any notes on the algorithm/clever shortcuts it takes.

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  • MSMQ on Win2008 R2 won’t receive messages from older clients

    - by Graffen
    Hi all I'm battling a really weird problem here. I have a Windows 2008 R2 server with Message Queueing installed. On another machine, running Windows 2003 is a service that is set up to send messages to a public queue on the 2008 server. However, messages never show up on the server. I've written a small console app that just sends a "Hello World" message to a test queue on the 2008 machine. Running this app on XP or 2003 results in absolutely nothing. However, when I try running the app on my Windows 7 machine, a message is delivered just fine. I've been through all sorts of security settings, disabled firewalls on all machines etc. The event log shows nothing of interest, and no exceptions are being thrown on the clients. Running a packet sniffer (WireShark) on the server reveals only a little. When trying to send a message from XP or 2003 I only see an ICMP error "Port Unreachable" on port 3527 (which I gather is an MQPing packet?). After that, silence. Wireshark shows a nice little stream of packets when I try from my Win7 client (as expected - messages get delivered just fine from Win7). I've enabled MSMQ End2End logging on the server, but only entries from the messages sent from my Win7 machine are appearing in the log. So somehow it seems that messages are being dropped silently somewhere along the route from XP or 2003 to my 2008 server. Does anyone have any clues as to what might be causing this mysterious behaviour? -- Jesper

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  • Problems with $libdir on PostgreSQL

    - by Joe Germuska
    In short, my question is "why doesn't $libdir work on my PSQL installation." CREATE FUNCTION st_box2d_in(cstring) RETURNS box2d AS '$libdir/liblwgeom', 'BOX2DFLOAT4_in' LANGUAGE c IMMUTABLE STRICT; yields an error could not access file "$libdir/liblwgeom": No such file or directory while CREATE FUNCTION st_box2d_in(cstring) RETURNS box2d AS '/usr/local/pgsql/lib/liblwgeom', 'BOX2DFLOAT4_in' LANGUAGE c IMMUTABLE STRICT; works correctly. The output of % pg_config --pkglibdir /usr/local/pgsql/lib appears to be correct.

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  • Using DPAPI / ProtectedData in a web farm environment with the User Store

    - by Lachman
    I was wondering if anyone had successfully used DPAPI with a user store in a web farm enviroment? Because our application is a recently converted from 1.1 to 2.0 asp.net app, we're using a custom wrapper which directly calls the CryptUnprotect methods. But this should be the same as the ProtectedData method available in the 2.0 framework. Because we are operating in a web farm environment, we can't guarantee that the machine that did the encryption is going to be the one decrypting it. (Also because machine failures shouldn't destroy our encrypted data). So what we have is a serviced component that runs in a service under a particular user account on each one of our web boxes. This user is a set up to have a roaming profile, as per the recomendation. The problem we have is that info encrypted on one machine can not be decrypted on another, this fails with the win32 error 'Key not valid for use in specified state'. I suspect that this is because I've made a mistake by having the encryption service running as the user on multiple machines, hence keeping the user logged in on more than one machine at the same time. If this is the problem, how are other using DPAPI with the User Store in a web farm environment?

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  • Palindrome Golf

    - by Claudiu
    The goal: Any language. The smallest function which will return whether a string is a palindrome. Here is mine in Python: R=lambda s:all(a==b for a,b in zip(s,reversed(s))) 50 characters. The accepted answer will be the current smallest one - this will change as smaller ones are found. Please specify the language your code is in.

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  • The RSA key container could not be opened

    - by TenaciousImpy
    Hi, I've been developing an ASP.NET site on an older machine running XP home. I recently got a new Win 7 PC and moved all my project files across. When I try and run the project, I get this error message: "Failed to decrypt using provider 'MyRsaProtectedConfigurationProvider'. Error message from the provider: The RSA key container could not be opened." I realised that I encrypted parts of my web.config file using a RSA encryption. This is where the problem now lies. I'm not sure how to get that key working again so that I can use it on my new machine. I exported the key from the older machine and imported it using: aspnet_regiis -pi "RSAProviderName" "C:\RSA_configkey.xml" This was imported successfully. I then ran the project, but the same error message came up. I figured it might be a permission thing, so I ran: aspnet_regiis -pa "RSAProviderName" "\Desktop" -full This was also successful, but I still get the error. From reading around, I've seen people use "ASPNET" instead of "\Desktop" (Desktop is my machine name). However, when I try and use "ASPNET", I get: No mapping between account name and security IDs was done. <Exception from HRESULT = 0x80070534 I can't work on the project until this is fixed, so any help is much appreciated. Thanks!

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  • Codeigniter initializing multiple times per page load

    - by Clayton
    I'm using Codeigniter for my application and have something wrong with my configuration. When I load a page, the framework initializes several times (see logs below). I have built other applications with Codeigniter and have never seen this behavior before. Log output: DEBUG - 2010-03-27 14:50:32 --> Config Class Initialized DEBUG - 2010-03-27 14:50:32 --> Hooks Class Initialized DEBUG - 2010-03-27 14:50:32 --> URI Class Initialized DEBUG - 2010-03-27 14:50:32 --> Router Class Initialized DEBUG - 2010-03-27 14:50:32 --> Output Class Initialized DEBUG - 2010-03-27 14:50:32 --> Input Class Initialized DEBUG - 2010-03-27 14:50:32 --> XSS Filtering completed DEBUG - 2010-03-27 14:50:32 --> XSS Filtering completed DEBUG - 2010-03-27 14:50:32 --> XSS Filtering completed DEBUG - 2010-03-27 14:50:32 --> XSS Filtering completed DEBUG - 2010-03-27 14:50:32 --> Global POST and COOKIE data sanitized DEBUG - 2010-03-27 14:50:32 --> Language Class Initialized DEBUG - 2010-03-27 14:50:32 --> Loader Class Initialized DEBUG - 2010-03-27 14:50:32 --> Config file loaded: config/redux_auth.php DEBUG - 2010-03-27 14:50:32 --> Config file loaded: config/email.php DEBUG - 2010-03-27 14:50:32 --> Helper loaded: url_helper DEBUG - 2010-03-27 14:50:32 --> Helper loaded: form_helper DEBUG - 2010-03-27 14:50:32 --> Helper loaded: html_helper DEBUG - 2010-03-27 14:50:32 --> Database Driver Class Initialized DEBUG - 2010-03-27 14:50:32 --> Session Class Initialized DEBUG - 2010-03-27 14:50:32 --> Helper loaded: string_helper DEBUG - 2010-03-27 14:50:32 --> Helper loaded: file_helper DEBUG - 2010-03-27 14:50:32 --> Session routines successfully run DEBUG - 2010-03-27 14:50:32 --> Form Validation Class Initialized DEBUG - 2010-03-27 14:50:32 --> Model Class Initialized DEBUG - 2010-03-27 14:50:32 --> Controller Class Initialized DEBUG - 2010-03-27 14:50:32 --> Language file loaded: language/english/form_validation_lang.php DEBUG - 2010-03-27 14:50:32 --> XSS Filtering completed DEBUG - 2010-03-27 14:50:32 --> XSS Filtering completed DEBUG - 2010-03-27 14:50:32 --> Config Class Initialized DEBUG - 2010-03-27 14:50:32 --> Hooks Class Initialized DEBUG - 2010-03-27 14:50:32 --> URI Class Initialized DEBUG - 2010-03-27 14:50:32 --> Router Class Initialized DEBUG - 2010-03-27 14:50:32 --> Output Class Initialized DEBUG - 2010-03-27 14:50:32 --> Input Class Initialized DEBUG - 2010-03-27 14:50:32 --> XSS Filtering completed DEBUG - 2010-03-27 14:50:32 --> Global POST and COOKIE data sanitized DEBUG - 2010-03-27 14:50:32 --> Language Class Initialized DEBUG - 2010-03-27 14:50:32 --> Loader Class Initialized ... This repeats three more times

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  • How to create a compiler in vb.net

    - by Cyclone
    Before answering this question, understand that I am not asking how to create my own programming language, I am asking how, using vb.net code, I can create a compiler for a language like vb.net itself. Essentially, the user inputs code, they get a .exe. By NO MEANS do I want to write my own language, as it seems other compiler related questions on here have asked. I also do not want to use the vb.net compiler itself, nor do I wish to duplicate the IDE. The exact purpose of what I wish to do is rather hard to explain, but all I need is a nudge in the right direction for writing a compiler (from scratch if possible) which can simply take input and create a .exe. I have opened .exe files as plain text before (my own programs) to see if I could derive some meaning from what I assumed would be human readable text, yet I was obviously sorely disappointed to see the random ascii, though it is understandable why this is all I found. I know that a .exe file is simply lines of code, being parsed by the computer it is on, but my question here really boils down to this: What code makes up a .exe? How could I go about making one in a plain text editor if I wanted to? (No, I do not want to do that, but if I understand the process my goals will be much easier to achieve.) What makes an executable file an executable file? Where does the logic of the code fit in? This is intended to be a programming question as opposed to a computer question, which is why I did not post it on SuperUser. I know plenty of information about the System.IO namespace, so I know how to create a file and write to it, I simply do not know what exactly I would be placing inside this file to get it to work as an executable file. I am sorry if this question is "confusing", "dumb", or "obvious", but I have not been able to find any information regarding the actual contents of an executable file anywhere. One of my google searches Something that looked promising EDIT: The second link here, while it looked good, was an utter fail. I am not going to waste hours of my time hitting keys and recording the results. "Use the "Alt" and the 3-digit combinations to create symbols that do not appear on the keyboard but that you need in the program." (step 4) How the heck do I know what symbols I need??? Thank you very much for your help, and my apologies if this question is a nooby or "bad" one. To sum this up simply: I want to create a program in vb.net that can compile code in a particular language to a single executable file. What methods exist that can allow me to do this, and if there are none, how can I go about writing my own from scratch?

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  • What is "Call By Name"?

    - by forellana
    Hi to everyone! I'm working in a homework, and the professor asked me to implement the evaluation strategy called "call by name" in scheme in a certain language that we developed and he gave us an example at http://www.scala-lang.org/node/138 in the scala language, but i don't understand in what consists the call by name evaluation strategy? what differences it has with call by need? thanks, greetings

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  • jQuery / javascript and nested if statements

    - by rayne
    I have a multi-lingual page where I want to display form validation error in the user's language. I use a hidden input to determine which language version the user is browsing like this: <input type="hidden" name="lang" id="lang" value="<?php echo $lang; ?>" /> The PHP side of the script works, but jQuery doesn't seem to realize which language is passed on. It displays the English error message no matter on which language site I am. Here's the code (I removed the other form fields for length): $(document).ready(function(){ $('#contact').submit(function() { $(".form_message").hide(); var emailReg = /^([\w-\.]+@([\w-]+\.)+[\w-]{2,4})?$/; var lang = $("#lang").val(); var name = $("#name").val(); var dataString = { 'lang': lang, 'name': name } if (name == '') { if (lang == 'de') { $("#posted").after('<div class="form_message"><p><span class="error">Fehler:</span> Bitte gib deinen Namen an!</p></div>'); } else { $("#posted").after('<div class="form_message"><p><span class="error">Error:</span> Please enter your name!</p></div>'); } $("#name").focus(); $("#name").addClass('req'); } else { $("#loading").show(); $("#loading").fadeIn(400).html('<img src="/img/loading.gif" />Loading...'); $.ajax({ type: "POST", url: "/contact-post.php", data: dataString, cache: false, success: function(html){ $("#loading").hide(); $("#posted").after('<div class="form_message"><p>Thank you! Your contact request has been sent.</p></div>'); $("#contact input:submit").attr("disabled", "disabled").val("Success!"); } }); }return false; }); }); The problem seems to be somewhere in the nested if statement. Does jQuery / javascript even recognize nested ifs? And if yes, why is it not working?

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  • Validating button click event using JS from inside ascx nested inside updatepanel

    - by Viswa
    Hello I have a button inside an ascx inside an update panel inside aspx content page. When the button is clicked i want it to run a JS function that causes to show a panel. Here is my Code. <pre> <%@ Control Language="C#" AutoEventWireup="true" CodeBehind="ABC.ascx.cs" Inherits="App.ABC" %> <script type= "text/javascript" language="javascript"> var val1=0; var val2=0; function ShowPanel(val2) { if(val2 != 0) { switch(val2) { case 1 : document.getElementById('<%=pnl1.ClientID%>').style.visibility = 'visible'; break; } } return false; } </script> <asp:LinkButton ID="lbl1" runat="server" OnClick="return ShowPanel(1);">count</asp:LinkButton> I am not sue how to do this. Please help Update #1 - ABC.ascx is in updatepanel in the aspx page XYZ.aspx <%@ Control Language="C#" AutoEventWireup="true" CodeBehind="ABC.ascx.cs" Inherits="App.ABC" %> <script type= "text/javascript" language="javascript"> var val1=0; var val2=0; function ShowPanel(val2) { if (val2 != 0) { switch (val2) { case 1: document.getElementById("<%= this.pnl1.ClientID%>").style.display = "none"; break; } } return false; } </script> <div> <div style="text-align:center"> </div> <table style="width:100%; text-align:center; border-color:#99CCFF" border="3"> <tr style="text-align:left"> <td><asp:LinkButton ID="lbl1" runat="server" OnClientClick="return ShowPanel(1);">count</asp:LinkButton> </td> <td style="text-align:right"><asp:Button ID="btnHide1" runat="server" Text="hide" Height="18px" Width="32px"/> </td> </tr> <tr> <td colspan="2"><asp:Panel ID="pnl1" runat="server" Visible="false"> </asp:Panel> </td> </tr> </table> </div>

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  • what is the difference between response.redirect and response status 301 redirects in asp ?

    - by Nikhil Vaghela
    Our asp application is moving to new server and i want to implement a permenant url redirection. I am aware of following two approaches , i need to understand which one to user over other and when ? Option 1: <%@ Language=VBScript %><% Response.Redirect “http://www.new-url.com” %> Option 2: <%@ Language=VBScript %><% Response.Status="301 Moved Permanently" Response.AddHeader "Location","http://www.new-url.com/" %> Thanks, Nikhil.

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  • Why is Perl commonly used for writing CGI scripts?

    - by Michael Vasquez
    I plan to add a better search feature to my site, so I thought that I would write it in C and use the CGI as a means to access it. But it seems that Perl is the most popular language when it comes to CGI-based stuff. Why is that? Wouldn't it be faster programmed in C or machine code? What advantages, if any, are there to writing it in a scripting language? Thanks.

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  • Multilanguage website sitemap

    - by Alex
    My site is i18n based on the following structure: mydomain.com/en mydomain.com/en/product/blue-widgets mydomain.com/fr mydomain.com/fr/product/blue-widgets The site is internationalised not localised, therefore i don't want to GEO target specific locals just target "french" or "english" speaking users. When submitting a sitemap to the search engines should i send one sitemap with links to all the different language versions or have one separate sitemap for each language. Is that even possible?

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  • Firebird Data Access Designer (DDEX) installation

    - by persian Dev
    hi i want to use firebird library , and i followed its instruction as below , but i get "The referenced component 'FirebirdSql.Data.Firebird' could not be found." error. instruction : Prerequisites Make sure that you have Visual Studio .NET 2005 Standard or higher edition. Express editions are not supported. Registry update Remember to update the path in FirebirdDDEXProviderPackageLess32.reg or FirebirdDDEXProviderPackageLess64.reg, places where to update it are marked %Path%. Install the .reg file into the registry. Machine.config update Add the following two sections to machine.config (located usually at C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\CONFIG\machine.config and C:\WINDOWS\Microsoft.NET\Framework64\v2.0.50727\CONFIG\machine.config on 64-bit system). <configuration> ... <configSections> ... <section name="firebirdsql.data.firebirdclient" type="System.Data.Common.DbProviderConfigurationHandler, System.Data, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" /> ... </configSections> ... <system.data> <DbProviderFactories> ... <add name="FirebirdClient Data Provider" invariant="FirebirdSql.Data.FirebirdClient" description=".Net Framework Data Provider for Firebird" type="FirebirdSql.Data.FirebirdClient.FirebirdClientFactory, FirebirdSql.Data.FirebirdClient, Version=%Version%, Culture=%Culture%, PublicKeyToken=%PublicKeyToken%" /> ... </DbProviderFactories> </system.data> ... </configuration> And subst: %Version% With the version of the provider assembly that you have in the GAC. %Culture% With the culture of the provider assembly that you have in the GAC. %PublicKeyToken% With the PublicKeyToken of the provider assembly that you have in the GAC.

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  • Executing Javascript without a browser?

    - by Daniel
    I am looking into Javascript programming without a browser. I want to run scripts from the Linux or Mac OS X command line, much like we run any other scripting language (ruby, php, perl, python...) $ javascript my_javascript_code.js I looked into spider monkey (Mozilla) and v8 (Google), but both of these appear to be embedded. Is anyone using Javascript as a scripting language to be executed from the command line? If anyone is curious why I am looking into this, I've been poking around node.js

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  • Internet Explorer cannot 'fully' load ActiveX Control

    - by K Browne
    Context I am migrating an installer for an ActiveX control from Per-Machine to Per-User. I did this by programming the installer write to HKCU\Software\Classes instead of HKLM\Software\Classes. Problem On my machine (Windows 7 with UAC Enabled), the ActiveX control successfully loads. On the other windows 7 test machines (one with UAC enabled, one with UAC disabled), the control 'partially' loads. What is Partially? When a user visits a page with the ActiveX control, Internet Explorer displays a warning message in a yellow bar on the top of the window. If you click the 'Run add-on' button in the bar, the control becomes visible and begins to run, but Javascript code that tries to access properties of the control return the error: Library not registered. Differences between machines On the dev machine reads from HKCR\CLSID\<GUID> succeed while on the test machines these reads fail. Reads from HKCU succeed on both dev and test machines. Reads from HKLM fail on both test and dev machines. (I collected reads using Sysinternals Process Monitor) Strangely, the keys that Internet Explorer fails to read are clearly visible if I use regedit to view HKCR\CLSID\<GUID> on the test machines. Question What can I do to get the per-user control to load on the test machines? What could cause this difference between the dev machine and the test machines? Why can I see the key in HKCR with RegEdit but Internet Explorer cannot see the key? Any help is appreciated. Thank you.

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