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  • RTMPDUMPTV problem

    - by ranavita
    (Reading database ... 459988 files and directories currently installed.) Unpacking librtmp-dev (from .../librtmp-dev_2.4~20110711.gitc28f1bab-1_amd64.deb) ... dpkg: error processing /var/cache/apt/archives/librtmp-dev_2.4~20110711.gitc28f1bab-1_amd64.deb (--unpack): trying to overwrite '/usr/include/librtmp/amf.h', which is also in package rtmpdump 2.5-0ubuntu2~precise Errors were encountered while processing: /var/cache/apt/archives/librtmp-dev_2.4~20110711.gitc28f1bab-1_amd64.deb E: Sub-process /usr/bin/dpkg returned an error code (1) above error code results after running sudo apt-get install -f A I am trying to fix the broken package of rtmptv

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  • &lt;%: %&gt;, HtmlEncode, IHtmlString and MvcHtmlString

    - by Shaun
    One of my colleague and friend, Robin is playing and struggling with the ASP.NET MVC 2 on a project these days while I’m struggling with a annoying client. Since it’s his first time to use ASP.NET MVC he was meetings with a lot of problem and I was very happy to share my experience to him. Yesterday he asked me when he attempted to insert a <br /> element into his page he found that the page was rendered like this which is bad. He found his <br /> was shown as a part of the string rather than creating a new line. After checked a bit in his code I found that it’s because he utilized a new ASP.NET markup supported in .NET 4.0 – “<%: %>”. If you have been using ASP.NET MVC 1 or in .NET 3.5 world it would be very common that using <%= %> to show something on the page from the backend code. But when you do it you must ensure that the string that are going to be displayed should be Html-safe, which means all the Html markups must be encoded. Otherwise this might cause an XSS (cross-site scripting) problem. So that you’d better use the code like this below to display anything on the page. In .NET 4.0 Microsoft introduced a new markup to solve this problem which is <%: %>. It will encode the content automatically so that you will no need to check and verify your code manually for the XSS issue mentioned below. But this also means that it will encode all things, include the Html element you want to be rendered. So I changed his code like this and it worked well. After helped him solved this problem and finished a spreadsheet for my boring project I considered a bit more on the <%: %>. Since it will encode all thing why it renders correctly when we use “<%: Html.TextBox(“name”) %>” to show a text box? As you know the Html.TextBox will render a “<input name="name" id="name" type="text"/>” element on the page. If <%: %> will encode everything it should not display a text box. So I dig into the source code of the MVC and found some comments in the class MvcHtmlString. 1: // In ASP.NET 4, a new syntax <%: %> is being introduced in WebForms pages, where <%: expression %> is equivalent to 2: // <%= HttpUtility.HtmlEncode(expression) %>. The intent of this is to reduce common causes of XSS vulnerabilities 3: // in WebForms pages (WebForms views in the case of MVC). This involves the addition of an interface 4: // System.Web.IHtmlString and a static method overload System.Web.HttpUtility::HtmlEncode(object). The interface 5: // definition is roughly: 6: // public interface IHtmlString { 7: // string ToHtmlString(); 8: // } 9: // And the HtmlEncode(object) logic is roughly: 10: // - If the input argument is an IHtmlString, return argument.ToHtmlString(), 11: // - Otherwise, return HtmlEncode(Convert.ToString(argument)). 12: // 13: // Unfortunately this has the effect that calling <%: Html.SomeHelper() %> in an MVC application running on .NET 4 14: // will end up encoding output that is already HTML-safe. As a result, we're changing out HTML helpers to return 15: // MvcHtmlString where appropriate. <%= Html.SomeHelper() %> will continue to work in both .NET 3.5 and .NET 4, but 16: // changing the return types to MvcHtmlString has the added benefit that <%: Html.SomeHelper() %> will also work 17: // properly in .NET 4 rather than resulting in a double-encoded output. MVC developers in .NET 4 will then be able 18: // to use the <%: %> syntax almost everywhere instead of having to remember where to use <%= %> and where to use 19: // <%: %>. This should help developers craft more secure web applications by default. 20: // 21: // To create an MvcHtmlString, use the static Create() method instead of calling the protected constructor. The comment said the encoding rule of the <%: %> would be: If the type of the content is IHtmlString it will NOT encode since the IHtmlString indicates that it’s Html-safe. Otherwise it will use HtmlEncode to encode the content. If we check the return type of the Html.TextBox method we will find that it’s MvcHtmlString, which was implemented the IHtmlString interface dynamically. That is the reason why the “<input name="name" id="name" type="text"/>” was not encoded by <%: %>. So if we want to tell ASP.NET MVC, or I should say the ASP.NET runtime that the content is Html-safe and no need, or should not be encoded we can convert the content into IHtmlString. So another resolution would be like this. Also we can create an extension method as well for better developing experience. 1: using System; 2: using System.Collections.Generic; 3: using System.Linq; 4: using System.Web; 5: using System.Web.Mvc; 6:  7: namespace ShaunXu.Blogs.IHtmlStringIssue 8: { 9: public static class Helpers 10: { 11: public static MvcHtmlString IsHtmlSafe(this string content) 12: { 13: return MvcHtmlString.Create(content); 14: } 15: } 16: } Then the view would be like this. And the page rendered correctly.         Summary In this post I explained a bit about the new markup in .NET 4.0 – <%: %> and its usage. I also explained a bit about how to control the page content, whether it should be encoded or not. We can see the ASP.NET MVC gives us more points to control the web pages.   Hope this helps, Shaun All documents and related graphics, codes are provided "AS IS" without warranty of any kind. Copyright © Shaun Ziyan Xu. This work is licensed under the Creative Commons License.

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  • Google I/O 2012 - Fireside Chat with the Hangouts Team

    Google I/O 2012 - Fireside Chat with the Hangouts Team Come join a conversation with the Google+ Hangouts team. Hear the thinking behind Google's real time strategy and learn how businesses, broadcasters, developers, and families are all using the product. Ever wondered how a hangout on air works? Come to this session to get all your questions answered and learn what's in store for hangouts in the future. For all I/O 2012 sessions, go to developers.google.com From: GoogleDevelopers Views: 58 0 ratings Time: 01:00:01 More in Science & Technology

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  • Google Maps API Office Hours

    Google Maps API Office Hours Interested in knowing more about the Google Maps API announcements that were made at I/O? During this week's Google Maps API Office Hours, +Josh Livni and +Paul Saxman will give an overview of the Google Maps API features that were announced at I/O, and will talk about the I/O session content that is now available online. The next Office Hours will be this Tuesday at 11am, Pacific Time. Bring your questions, and join us there! From: GoogleDevelopers Views: 167 9 ratings Time: 21:25 More in Science & Technology

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  • Introduction to Google Apps Script Triggers

    Introduction to Google Apps Script Triggers Love Apps Script, but wish that it would just automatically work in the background? We've got just the thing for you - Triggers! This show will be an introductory level show about how to set up Apps Script so your scripts are run on a schedule, or in response to certain events like a spreadsheet being edited or a form submission. We'll talk about what triggers are, how to manually schedule triggers, how to programmatically create them, and some of the cool things you can do with them. From: GoogleDevelopers Views: 87 13 ratings Time: 50:17 More in Science & Technology

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  • Google I/O Sandbox Case Study: Doubletwist

    Google I/O Sandbox Case Study: Doubletwist We interviewed DoubleTwist at the Google I/O Sandbox on May 11, 2011. They explained to us the benefits of building their DoubleTap application on the Android Platform. DoubleTwist AirSync let's you wirelessly sync your music collection across all your devices. Their new app, DoubleTap, let's you share music between phones by simply tapping the phones together. For more information about developing on Android, visit: developer.android.com For more information on DoubleTwist, visit: www.doubletwist.com From: GoogleDevelopers Views: 13 0 ratings Time: 01:42 More in Science & Technology

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  • Two book reviews

    - by bipinjoshi
    I recently reviewed two books -  Programming Microsoft ASP.NET MVC, 2nd Edition and Programming Entity Framework - Code First. Here are the links to the complete reviews:Programming Microsoft ASP.NET MVC, 2nd Edition http://www.bipinjoshi.net/articles/43fcbd2d-2d44-4df7-9cf1-492eb63bc31a.aspx Programming Entity Framework - Code Firsthttp://www.bipinjoshi.net/articles/5e5ea033-a57e-436b-9b4c-e3638e8260b6.aspx  

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  • GDD-BR 2010 [1F] Flexible Android Applications

    GDD-BR 2010 [1F] Flexible Android Applications Speaker: Fred Chung Track: Android Time slot: F[15:30 - 16:15] Room: 1 Level: 201 Android provides facilities to make flexible applications that work well for everyone on any piece of hardware running Android. This session will cover localization and internationalization, as well as how to write an app that can detect and adapt to the hardware and software resources available to it. From: GoogleDevelopers Views: 10 0 ratings Time: 37:47 More in Science & Technology

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  • Fusion Tables API enfocando a los desarrolladores

    Fusion Tables API enfocando a los desarrolladores En este programa presentaremos una visión general de las novedades tecnológicas desde el equipo de relaciones para desarrolladores de la región de sur de Latinoamérica. Seguiremos presentando nuestro enfoque de desarrollo, ingeniería y las mejores prácticas para implementar tecnología Google favoreciendo la evolución de soluciones tecnológicas. Luego nos introduciremos en un escenario técnico en donde analizaremos la solución Fusion Tables API para desarrolladores(seguimos trabajando sobre los entornos de persistencia en la nube). Finalmente estaremos conversando con la comunidad de desarrollo, resolviendo un desafío técnico y premiando todo el talento regional From: GoogleDevelopers Views: 0 1 ratings Time: 00:00 More in Education

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  • Google Maps Developers Live: Mapping with Style

    Google Maps Developers Live: Mapping with Style Compelling and informative map visualizations require simple, yet useful, maps... and some beautiful data. For this episode of Google Maps Developers Live, Paul Saxman discusses how he designed a few of his favorite map styles, and shares a few of his tools and techniques for designing maps for visualizations. From: GoogleDevelopers Views: 0 0 ratings Time: 30:00 More in Education

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