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  • How to protect against GHC7 compiled programs taking all memory?

    - by Petr Pudlák
    When playing with various algorithms in Haskell it often happens to me that I create a program with a memory leak, as it often happens with lazy evaluation. The program taking all the memory isn't really fun, I often have difficulty killing it if I realize it too late. When using GHC6 I simply had export GHCRTS='-M384m' in my .bashrc. But in GHC7 they added a security measure that unless a program is compiled with -rtsopts, it simply fails when it is given any RTS option either on a command line argument or in GHCRTS. Unfortunately, almost no Haskell programs are compiled with this flag, so setting this variable makes everything to fail (as I discovered in After upgrading to GHC7, all programs suddenly fail saying "Most RTS options are disabled. Link with -rtsopts to enable them."). Any ideas how to make any use of GHCRTS with GHC7, or another convenient way how to prevent my programs taking all memory?

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  • Are private members inherited in C#?

    - by Petr
    Just seen one tutorial saying that: Class Dog { private string Name; } Class SuperDog:Dog { private string Mood; } Then there was an UML displaying that SuperDog will inherit Name as well. I have tried but to me it seems that only public members are inherited. At least I could not access Name unless it was declared as public.

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  • Why is my BeginInvoke method not async?

    - by Petr
    Hi, In order to avoid freezing of GUI, I wanted to run method connecting to DB asynchronously. Therefore I have written this: DelegatLoginu dl = ConnectDB; IAsyncResult ar=dl.BeginInvoke(null, null); bool result = (bool)dl.EndInvoke(ar); But it is still freezing and I do not understand why - I though BeginInvoke assures that method it references is run in another thread. Thank you!

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  • VS Express - accessing image added to project folder

    - by Petr
    Hi, I would like to know following: I added the folder "Graphics" into my project and placed one BMP to it. Now I would like to load the image from my code, but I cannot figure out how. I know its simple with resources but is there a way without adding the image into resources? Thanks

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  • WPF textbox derived control override drag&drop OnPreviewDrop (C sharp)

    - by Petr Klus
    Hi, I have been working on my custom control derived from the TextBox and I have encountered a problem I can not solve right now. Brief description of the problem: my textbox contains plain text which contains tags which I want to keep consistent - so far I have overriden text selection so they can be selected only as a whole tag etc. Right now I have moved to processing of drag&drop. If any text is dropped on the textfield and it is dropped on the tag, I want the insertion to be moved before or after the tag. The actual problem is with setting of the e.Handled=true. If I set it to true, it almost works - the text is inserted via my routine, but it is not removed from the source. If I set it to false, after executing my method the original textbox's insertion method is run. Is there any way to alter event routing? Or am I approaching this wrong from the start? Code of my method: protected override void OnPreviewDragEnter(DragEventArgs e) { base.OnPreviewDragEnter(e); e.Handled = true; // let us draw our very own caret... } protected override void OnPreviewDrop(DragEventArgs e) { base.OnPreviewDrop(e); fieldsReady = false; int selStart = this.SelectionStart; int selLength = this.SelectionLength; string droppedData = (string)e.Data.GetData(DataFormats.StringFormat); // where to insert Point whereDropped = e.GetPosition(this); int droppedIndex = GetCharacterIndexFromPoint(whereDropped, true); if (droppedIndex == this.Text.Length - 1) { double c = GetRectFromCharacterIndex(droppedIndex).X; if (whereDropped.X > c) droppedIndex++; } // only if the source was us, do this: if (this.SelectionLength > 0) // this means that we are dragging from our textbox! { // was there any selection? if so, remove it! this.Text = this.Text.Substring(0, selStart) + this.Text.Substring(selStart + selLength); e.Handled = true; // 2DO!! alter the indices depending on the removed selection // insertion this.Text = this.Text.Substring(0, droppedIndex) + droppedData + this.Text.Substring(droppedIndex); } }

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  • PHP while(variable=mysql_fetch_assoc) - explanation

    - by Petr
    Hi, I have been working with C# so this is quite strange for me: while($variable=mysql_fetch_assoc) I have not been able to look up in PHP manual how it works. I guess that in each loop it advances to next element of assoc.array. But what is this generally called in PHP? I am just not used to see '=' in loop condition.

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  • Why can't I set attribute "TYPE" of LI element in IE?

    - by Petr Urban
    Hello, I've just come to an unusual beghavior of Internet Explorer IE (v8.0.6001.18904). When I try to set "type" attribute of any <LI> element, it will result into error. I used jQuery (v1.32): $("<li>").attr("type", "test"); The same thing works for DIV. LI element does not seem to have "type" attribute reserved by HTML or XHTML definitions. It also might be jQuery issue. Solution is simple - just use another attribute name :-) But is there someone out there who knows WHY does this error occur? Could it happen with another attribute names? Why the error comes with LI element only?

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  • Programming terms - field, member, properties (C#)

    - by Petr
    Hi, I was trying to find meaning of this terms but especially due to language barrier I was not able to understand what they are used for. I assume that "field" is variable (object too?) in the class while "property" is just an object that returns specific value and cannot contain methods etc. By "member" I understand any object that is declared on the class level. But these are just my assumptions based on commented code samples where some careful programmers used "property region" etc. I would really appreciate if someone could explain it to me.

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  • C# - are private members inherited?

    - by Petr
    Hi, Just seen one tutorial saying that: Class Dog { private string Name; } Class SuperDog:Dog { private string Mood; } Then there was an UML displaying that SuperDog will inherit Name as well. I have tried but to me it seems that only public members are inherited. At least I could not access Name unless it was declared as public. Thanks

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  • Background image JFrame with content

    - by Petr Safar
    I have a JFrame with BorderLayout, there are panels on all sides (North, East ,...). In the panels there are labels and buttons mostly. Now I want the frame to have a background image, some research told me that i had to change the content pane of my frame. When I try this however, the content gets put in the background and isn't visible. Also, I don't know how to resize the image if the frame is resized. Is there an easy fix for this or will I have to rework most of my code?

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  • Join data from two Lists into one object

    - by Petr Mensik
    I ran into following situation and I am wondering about best solution. Let's say I have List<Object1> and List<Object2>, these lists are result of two separated queries. Both of them have the same size and there is relationship 1:1 between elements in the lists based on ID. I know that best solution would be fetching data in one DB query but that's possible right now. So my question is, what is the best way to join these lists into let's say List<Object3>?

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  • PHP mysql_fetch does not return values

    - by Petr
    Hi, Being quite new with PHP, I cannot find any solution why this does not work. The query is OK and the resource is returned. But I dunno why fetch_assoc does not print values. Thanks $query=sprintf("SELECT ID,NAME FROM USERS WHERE PASS='%s' AND NAME='%s'",mysql_real_escape_string($p),mysql_real_escape_string($n)); $result=mysql_query($query); if ($result) { while ($row = mysql_fetch_assoc($result)) { echo $row['ID']; echo $row['NAME']; } } }

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  • Why string.Replace("X","Y") works only when assigned to new string?

    - by Petr
    Hi, I guess it has to do something with string being a reference type but I dont get why simply string.Replace("X","Y") does not work? Why I need to do `string A=stringB.Replace("X","Y") I thought it is just a method to be done on specified instance? Thanks for explanation EDIT: Thank you so far. I extend my question Why "b+="FFF"works but the b.replace is not?

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  • Singleton rule questions (do not allow to create copy and deserialization)

    - by Petr
    Hi, Reading some article about singleton, I stopped at the point saying: "Do not allow to crate copy of existing instance". I realized that I do not know how would I do that! Could you tell me, please, how could I copy existing instance of class? And the second one: deserializaition. How it could be dangerous? And for both - how to deny creating copies or deserialization? Thanks

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  • Archbeat Link-O-Rama Top 10 Facebook Faves for October 20-26, 2013

    - by OTN ArchBeat
    Here's this week's list of the Top 10 items shared on the OTN ArchBeat Facebook Page from October 27 - November 2, 2013. Visualizing and Process (Twitter) Events in Real Time with Oracle Coherence | Noah Arliss This OTN Virtual Developer Day session explores in detail how to create a dynamic HTML5 Web application that interacts with Oracle Coherence as it’s processing events in real time, using the Avatar project and Oracle Coherence’s Live Events feature. Part of OTN Virtual Developer Day: Harnessing the Power of Oracle WebLogic and Oracle Coherence, November 5, 2013. 9am to 1pm PT / 12pm to 4pm ET / 1pm to 5pm BRT. Register now! HTML5 Application Development with Oracle WebLogic Server | Doug Clarke This free OTN Virtual Developer Day session covers the support for WebSockets, RESTful data services, and JSON infrastructure available in Oracle WebLogic Server. Part of OTN Virtual Developer Day: Harnessing the Power of Oracle WebLogic and Oracle Coherence, November 5, 2013. 9am to 1pm PT / 12pm to 4pm ET / 1pm to 5pm BRT. Register now! Video: ADF BC and REST services | Frederic Desbiens Spend a few minutes with Oracle ADF principal product manager Frederic Desbiens and learn how to publish ADF Business Components as RESTful web services. One Client Two Clusters | David Felcey "Sometimes its desirable to have a client connect to multiple clusters, either because the data is dispersed or for instance the clusters are in different locations for high availability," says David Felcey. David shows you how in this post, which includes a simple example. Exceptions Handling and Notifications in ODI | Christophe Dupupet Oracle Fusion Middleware A-Team director Christophe Dupupet reviews the techniques that are available in Oracle Data Integrator to guarantee that the appropriate individuals are notified in the event that ODI processes are impacted by network outages or other mishaps. Securing WebSocket applications on Glassfish | Pavel Bucek WebSocket is a key capability standardized into Java EE 7. Many developers wonder how WebSockets can be secured. One very nice characteristic for WebSocket is that it in fact completely piggybacks on HTTP. In this post Pavel Bucek demonstrates how to secure WebSocket endpoints in GlassFish using TLS/SSL. Oracle Coherence, Split-Brain and Recovery Protocols In Detail | Ricardo Ferreira Ricardo Ferreira's article "provides a high level conceptual overview of Split-Brain scenarios in distributed systems," focusing on a "specific example of cluster communication failure and recovery in Oracle Coherence." Non-programmatic Authentication Using Login Form in JSF (For WebCenter & ADF) | JayJay Zheng Oracle ACE JayJay Zheng shares an approach that "avoids the programmatic authentication and works great for having a custom login page developed in WebCenter Portal integrated with OAM authentication." The latest article in the Industrial SOA series looks at mobile computing and how companies are developing SOA to go. http://pub.vitrue.com/PUxT Tech Article: SOA in Real Life: Mobile Solutions The ACE Director Thing | Dr. Frank Munz Frank Munz finally gets around to blogging about achieving Oracle ACE Director status and shares some interesting insight into what will change—and what won't—thanks to that new status. A good, short read for those interested in learning more about the Oracle ACE program. Thought for the Day "Even if you're on the right track, you'll get run over if you just sit there." — Will Rogers, American humorist (November 4, 1879 – August 15, 1935) Source: brainyquote.com

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  • CreateProcessAsUser doesn't draw the GUI

    - by pavel.tuzov
    Hi, I have a windows service running under "SYSTEM" account that checks if a specific application is running for each logged in user. If the application is not running, the service starts it (under corresponding user name). I'm trying to accomplish my goal using CreateProcessAsUser(). The service does start the application under corresponding user name, but the GUI is not drawn. (Yes, I'm making sure that "Allow service to interact with desktop" check box is enabled). System: XP SP3, labguage: C# Here is some code that might be of interest: PROCESS_INFORMATION processInfo = new PROCESS_INFORMATION(); startInfo.cb = Marshal.SizeOf(startInfo); startInfo.lpDesktop = "winsta0\\default"; bResult = Win32.CreateProcessAsUser(hToken, null, strCommand, IntPtr.Zero, IntPtr.Zero, false, 0, IntPtr.Zero, null, ref startInfo, out processInfo); As far as I understand, setting startInfo.lpDesktop = "winsta0\default"; should have used the desktop of corresponding user. Even contrary to what is stated here: http://support.microsoft.com/kb/165194, I tried setting lpDesktop to null, or not setting it at all, both giving the same result: process was started in the name of expected user and I could see a part of window's title bar. The "invisible" window intercepts mouse click events, handles them as expected. It just doesn't draw itself. Is anyone familiar with such a problem and knows what am I doing wrong?

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  • Use XMPP instead of HTTP

    - by pavel
    Hey guys. My friend and I, we are working on iPhone application. This application uses XMPP protocol to provide chat functionality. Right now we are designing architecture for the application. So my friend is working on iPhone side, and I am ruby on rails guy. My friend suggested, that we wrap every call, that is usually served via HTTP into XMPP. So, user registration, users search, profile editing, photo uploading, everything goes via XMPP. No HTTP at all. My friend wants to use XMPP, because he says, that it's much easier to implement XMPP on client-side rather HTTP. As for me, this is bullshit, but we've got a product owner, who have been working with my friend for a long time and he trusts him. So what I'm trying to do is to convince my friend and product owner that using XMPP for what HTTP can work find — is totally not the best idea. I feel, that if we implement everything on XMPP, we will have a pain in an ass till the end of lives. But how do I prove it? P.S. I'm not against chat over XMPP, I am against users search, photo uploading, rankings, nearby search and various other restful requests. Please, leave response. Any help appreciated. A little update: Yesterday we had a long discussion. And it turns out, it's quiete hard to receive response from both XMPP and HTTP in Objective-C. Because every single object and its data should be stored in Core Data model, while this model can't be securely modified from various places. Say, if you use HTTP transport, you always want to use only HTTP transport to update data in your model. And if you use XMPP, you should always use XMPP. So, you can't use both. That's what my iPhone buddy told me. It sounds weird for me, can anyone explain me that?

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  • scalacheck/scalatest not found: how to add it in sbt/scala?

    - by Pavel Reich
    I've installed typesafe-stack from http://typesafe.com/stack/download on my ubuntu12, than I created a play project (g8 typesafehub/play-scala) and now I want to add scalatest or scalacheck to my project. So my_app/project/plugins.sbt has the following lines: // The Typesafe repository resolvers += "Typesafe repository" at "http://repo.typesafe.com/typesafe/releases/" // Use the Play sbt plugin for Play projects addSbtPlugin("play" % "sbt-plugin" % "2.0.1") Then I added scalatest using addSbtPlugin: addSbtPlugin("org.scalatest" %% "scalatest" % "2.0.M1" % "test") and now it fails with the following message when I run 'sbt test' [info] Resolving org.scalatest#scalatest;2.0.M1 ... [warn] module not found: org.scalatest#scalatest;2.0.M1 [warn] ==== typesafe-ivy-releases: tried [warn] http://repo.typesafe.com/typesafe/ivy-releases/org.scalatest/scalatest/scala_2.9.1/sbt_0.11.3/2.0.M1/ivys/ivy.xml [warn] ==== local: tried [warn] ~/.ivy2/local/org.scalatest/scalatest/scala_2.9.1/sbt_0.11.3/2.0.M1/ivys/ivy.xml [warn] ==== Typesafe repository: tried [warn] http://repo.typesafe.com/typesafe/releases/org/scalatest/scalatest_2.9.1_0.11.3/2.0.M1/scalatest-2.0.M1.pom [warn] ==== typesafe-ivy-releases: tried [warn] http://repo.typesafe.com/typesafe/ivy- releases/org.scalatest/scalatest/scala_2.9.1/sbt_0.11.3/2.0.M1/ivys/ivy.xml [warn] ==== public: tried [warn] http://repo1.maven.org/maven2/org/scalatest/scalatest_2.9.1_0.11.3/2.0.M1/scalatest-2.0.M1.pom What I don't understand: why does it use this http://repo.typesafe.com/typesafe/releases/org/scalatest/scalatest_2.9.1_0.11.3/2.0.M1/scalatest-2.0.M1.pom URL instead of the real one http://repo.typesafe.com/typesafe/releases/org/scalatest/scalatest_2.9.1/2.0.M1/scalatest_2.9.1-2.0.M1.pom? Quite the same problem I have with scalacheck: it also tries to download using sbt-version specific artifactId whereas the repository has only scala-version specific. What am I doing wrong? I understand there must be a switch in sbt somewhere, not to use sbt-version as part of the artifact URL? I also tried using this in my plugins.sbt libraryDependencies += "org.scalatest" %% "scalatest" % "2.0.M1" % "test" but looks like it is completely ignored by sbt and scalatest.jar hasn't appeared in the classpath: my_app/test/AppTest.scala:1: object scalatest is not a member of package org [error] import org.scalatest.FunSuite because the output of sbt clean && sbt test has lots of Resolving org.easytesting#fest-util;1.1.6 or just another library, but nothing about scalatest. I use scala 2.9.1 and sbt 0.11.3, trying to use scalatest 2.0.M1 and 1.8; scalacheck: resolvers ++= Seq( "snapshots" at "http://oss.sonatype.org/content/repositories/snapshots", "releases" at "http://oss.sonatype.org/content/repositories/releases" ) libraryDependencies ++= Seq( "org.scalacheck" %% "scalacheck" % "1.9" % "test" ) With the same outcome, i.e. it uses the sbtVersion specific POM URL, which doesn't exist. What am I doing wrong? Thanks.

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  • IPhone app with SSL client certs

    - by Pavel Georgiev
    I'm building an iphone app that needs to access a web service over https using client certificates. If I put the client cert (in pkcs12 format) in the app bundle, I'm able to load it into the app and make the https call (largely thanks to stackoverflow.com). However, I need a way to distribute the app without any certs and leave it to the user to provide his own certificate. I thought I would just do that by instructing the user to import the certificate in iphone's profiles (settings-general-profiles), which is what you get by opening a .p12 file in Mail.app and then I would access that item in my app. I would expect that the certificates in profiles are available through the keychain API, but I guess I'm wrong on that. 1) Is there a way to access a certificate that I've already loaded in iphone's profile in my app? 2) What other options I have for loading a user specified certificate in my app? The only thing I can come up with is providing some interface where the user can give an URL to his .p12 cerificate, which I can then load into the app's keychain for later use, but thats not exactly user-friednly. I'm looking for something that would allow the user to put the cert on phone (email it to himself) and then load it in my app.

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