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  • Event Handlers and Automatic Postback in ASP.NET 3.5 Web Controls

    In one of last week s tutorials Creating Database-Driven ASP.NET 3.5 Input and List Web Controls you learned how to create a dynamic input web control that instead of setting values statically stored its list and values directly from the MS SQL server 2 8 database. This tutorial is a sequel to that article. It deals mostly with the server side coding aspect of dynamic web controls. It is recommended that you read the earlier tutorial first as the Visual Web Developer Project in that tutorial will be used extensively in this article.... Download a Free Trial of Windows 7 Reduce Management Costs and Improve Productivity with Windows 7

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  • Why C# is not statically typed but F# and Haskell are?

    - by ??????? ???????
    There was a talk given by Brian Hurt about advantages and disadvantages of static typing. Brian said that by static typing he don't mean C#, but F# and Haskell. Is it because of dynamic keyword added to C#-4.0? But this feature is relatively rarely useful. By the way, there are ? and unsafeCoerse in Haskell which obviously are not the same, but something that could blown your head off in runtime similarly like exception thrown as a result of dynamic. Finally, why F# and Haskell could be named a statically typed languages and C# couldn't?

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  • Apress Deal of the day - 5/Feb/2011

    - by TATWORTH
    Today's $10 Deal of the Day from Apress at http://www.apress.com/info/dailydeal is: Pro ASP.NET 4 in C# 2010, Fourth Edition ASP.NET 4 is the latest version of Microsoft's revolutionary ASP.NET technology. It is the principal standard for creating dynamic web pages on the Windows platform. Pro ASP.NET 4 in C# 2010 raises the bar for high-quality, practical advice on learning and deploying Microsoft's dynamic web solution. $59.99 | Published Jun 2010 | Matthew MacDonald I am reviewing this book at the moment but I was already sufficiently impressed by this book to have bought the PDF the day it was available last December.

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  • Cannot boot Windows 7 after installing Ubuntu 13.04

    - by whowantsakookie
    So I boot up my computer after installing Ubuntu 13.04. Grub correctly shows me all available boot options and I am able to boot to Ubuntu. However, when I try to boot into Windows 7, grub hangs at a purple screen. I have an HP laptop. It came with all four primary partitions taken up by the Windows bootloader, the actual Windows partition, one called HP_TOOLS, and another for HP Restore. I was able to back up and delete HP_TOOLS and the recovery partition, and change my disk type from Dynamic to Basic (GParted doesn't recognize Dynamic drives). I then booted into a live session of Ubuntu and made two partitions with GParted: one large partition for storage space that I could use between the two operating systems (sda4), and another extended partition (sda3) which contained Ubuntu (sda6) and it's swap space (sda5). It currently looks like this: I'm not sure if the second paragraph is actually relevant, I just want you to know all the variables in the equation. Thank you in advance for helping this poor noob.

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  • HTML5, PHP, JAVA or asp?

    - by user67418
    I am building a new website for a friend of mine. Its all plain html, and a server side include. The problem is to build static pages for 500 products would not be fun to create, or maintain. So i am forced to at least put dynamic information on these pages based off a spreadsheet, or dynamic pages all together. What i want to do is have a spreadsheet that can be used to keep track of in stock quantity, sku numbers, ecc.. that way i dont have to update hundreds of pages every night. He can just edit the spreadsheet and the pages will automatically adjust. I am a busy man, and i am not asking anyone to just give me the answer. But to save some time what is more worth learning to get this done fastest. HTML5, PHP, JAVA asp, or is there somehthing else better suited?

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  • web.xml not reloading in tomcat even after stop/start

    - by ajay
    This is in relation to:- http://stackoverflow.com/questions/2576514/basic-tomcat-servlet-error I changed my web.xml file, did ant compile , all, /etc/init.d/tomcat stop , start Even then my web.xml file in tomcat deployment is still unchanged. This is build.properties file:- app.name=hello catalina.home=/usr/local/tomcat manager.username=admin manager.password=admin This is my build.xml file. Is there something wrong with this:- <!-- Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file distributed with this work for additional information regarding copyright ownership. The ASF licenses this file to You under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. --> <!-- General purpose build script for web applications and web services, including enhanced support for deploying directly to a Tomcat 6 based server. This build script assumes that the source code of your web application is organized into the following subdirectories underneath the source code directory from which you execute the build script: docs Static documentation files to be copied to the "docs" subdirectory of your distribution. src Java source code (and associated resource files) to be compiled to the "WEB-INF/classes" subdirectory of your web applicaiton. web Static HTML, JSP, and other content (such as image files), including the WEB-INF subdirectory and its configuration file contents. $Id: build.xml.txt 562814 2007-08-05 03:52:04Z markt $ --> <!-- A "project" describes a set of targets that may be requested when Ant is executed. The "default" attribute defines the target which is executed if no specific target is requested, and the "basedir" attribute defines the current working directory from which Ant executes the requested task. This is normally set to the current working directory. --> <project name="My Project" default="compile" basedir="."> <!-- ===================== Property Definitions =========================== --> <!-- Each of the following properties are used in the build script. Values for these properties are set by the first place they are defined, from the following list: * Definitions on the "ant" command line (ant -Dfoo=bar compile). * Definitions from a "build.properties" file in the top level source directory of this application. * Definitions from a "build.properties" file in the developer's home directory. * Default definitions in this build.xml file. You will note below that property values can be composed based on the contents of previously defined properties. This is a powerful technique that helps you minimize the number of changes required when your development environment is modified. Note that property composition is allowed within "build.properties" files as well as in the "build.xml" script. --> <property file="build.properties"/> <property file="${user.home}/build.properties"/> <!-- ==================== File and Directory Names ======================== --> <!-- These properties generally define file and directory names (or paths) that affect where the build process stores its outputs. app.name Base name of this application, used to construct filenames and directories. Defaults to "myapp". app.path Context path to which this application should be deployed (defaults to "/" plus the value of the "app.name" property). app.version Version number of this iteration of the application. build.home The directory into which the "prepare" and "compile" targets will generate their output. Defaults to "build". catalina.home The directory in which you have installed a binary distribution of Tomcat 6. This will be used by the "deploy" target. dist.home The name of the base directory in which distribution files are created. Defaults to "dist". manager.password The login password of a user that is assigned the "manager" role (so that he or she can execute commands via the "/manager" web application) manager.url The URL of the "/manager" web application on the Tomcat installation to which we will deploy web applications and web services. manager.username The login username of a user that is assigned the "manager" role (so that he or she can execute commands via the "/manager" web application) --> <property name="app.name" value="myapp"/> <property name="app.path" value="/${app.name}"/> <property name="app.version" value="0.1-dev"/> <property name="build.home" value="${basedir}/build"/> <property name="catalina.home" value="../../../.."/> <!-- UPDATE THIS! --> <property name="dist.home" value="${basedir}/dist"/> <property name="docs.home" value="${basedir}/docs"/> <property name="manager.url" value="http://localhost:8080/manager"/> <property name="src.home" value="${basedir}/src"/> <property name="web.home" value="${basedir}/web"/> <!-- ==================== External Dependencies =========================== --> <!-- Use property values to define the locations of external JAR files on which your application will depend. In general, these values will be used for two purposes: * Inclusion on the classpath that is passed to the Javac compiler * Being copied into the "/WEB-INF/lib" directory during execution of the "deploy" target. Because we will automatically include all of the Java classes that Tomcat 6 exposes to web applications, we will not need to explicitly list any of those dependencies. You only need to worry about external dependencies for JAR files that you are going to include inside your "/WEB-INF/lib" directory. --> <!-- Dummy external dependency --> <!-- <property name="foo.jar" value="/path/to/foo.jar"/> --> <!-- ==================== Compilation Classpath =========================== --> <!-- Rather than relying on the CLASSPATH environment variable, Ant includes features that makes it easy to dynamically construct the classpath you need for each compilation. The example below constructs the compile classpath to include the servlet.jar file, as well as the other components that Tomcat makes available to web applications automatically, plus anything that you explicitly added. --> <path id="compile.classpath"> <!-- Include all JAR files that will be included in /WEB-INF/lib --> <!-- *** CUSTOMIZE HERE AS REQUIRED BY YOUR APPLICATION *** --> <!-- <pathelement location="${foo.jar}"/> --> <!-- Include all elements that Tomcat exposes to applications --> <fileset dir="${catalina.home}/bin"> <include name="*.jar"/> </fileset> <pathelement location="${catalina.home}/lib"/> <fileset dir="${catalina.home}/lib"> <include name="*.jar"/> </fileset> </path> <!-- ================== Custom Ant Task Definitions ======================= --> <!-- These properties define custom tasks for the Ant build tool that interact with the "/manager" web application installed with Tomcat 6. Before they can be successfully utilized, you must perform the following steps: - Copy the file "lib/catalina-ant.jar" from your Tomcat 6 installation into the "lib" directory of your Ant installation. - Create a "build.properties" file in your application's top-level source directory (or your user login home directory) that defines appropriate values for the "manager.password", "manager.url", and "manager.username" properties described above. For more information about the Manager web application, and the functionality of these tasks, see <http://localhost:8080/tomcat-docs/manager-howto.html>. --> <taskdef resource="org/apache/catalina/ant/catalina.tasks" classpathref="compile.classpath"/> <!-- ==================== Compilation Control Options ==================== --> <!-- These properties control option settings on the Javac compiler when it is invoked using the <javac> task. compile.debug Should compilation include the debug option? compile.deprecation Should compilation include the deprecation option? compile.optimize Should compilation include the optimize option? --> <property name="compile.debug" value="true"/> <property name="compile.deprecation" value="false"/> <property name="compile.optimize" value="true"/> <!-- ==================== All Target ====================================== --> <!-- The "all" target is a shortcut for running the "clean" target followed by the "compile" target, to force a complete recompile. --> <target name="all" depends="clean,compile" description="Clean build and dist directories, then compile"/> <!-- ==================== Clean Target ==================================== --> <!-- The "clean" target deletes any previous "build" and "dist" directory, so that you can be ensured the application can be built from scratch. --> <target name="clean" description="Delete old build and dist directories"> <delete dir="${build.home}"/> <delete dir="${dist.home}"/> </target> <!-- ==================== Compile Target ================================== --> <!-- The "compile" target transforms source files (from your "src" directory) into object files in the appropriate location in the build directory. This example assumes that you will be including your classes in an unpacked directory hierarchy under "/WEB-INF/classes". --> <target name="compile" depends="prepare" description="Compile Java sources"> <!-- Compile Java classes as necessary --> <mkdir dir="${build.home}/WEB-INF/classes"/> <javac srcdir="${src.home}" destdir="${build.home}/WEB-INF/classes" debug="${compile.debug}" deprecation="${compile.deprecation}" optimize="${compile.optimize}"> <classpath refid="compile.classpath"/> </javac> <!-- Copy application resources --> <copy todir="${build.home}/WEB-INF/classes"> <fileset dir="${src.home}" excludes="**/*.java"/> </copy> </target> <!-- ==================== Dist Target ===================================== --> <!-- The "dist" target creates a binary distribution of your application in a directory structure ready to be archived in a tar.gz or zip file. Note that this target depends on two others: * "compile" so that the entire web application (including external dependencies) will have been assembled * "javadoc" so that the application Javadocs will have been created --> <target name="dist" depends="compile,javadoc" description="Create binary distribution"> <!-- Copy documentation subdirectories --> <mkdir dir="${dist.home}/docs"/> <copy todir="${dist.home}/docs"> <fileset dir="${docs.home}"/> </copy> <!-- Create application JAR file --> <jar jarfile="${dist.home}/${app.name}-${app.version}.war" basedir="${build.home}"/> <!-- Copy additional files to ${dist.home} as necessary --> </target> <!-- ==================== Install Target ================================== --> <!-- The "install" target tells the specified Tomcat 6 installation to dynamically install this web application and make it available for execution. It does *not* cause the existence of this web application to be remembered across Tomcat restarts; if you restart the server, you will need to re-install all this web application. If you have already installed this application, and simply want Tomcat to recognize that you have updated Java classes (or the web.xml file), use the "reload" target instead. NOTE: This target will only succeed if it is run from the same server that Tomcat is running on. NOTE: This is the logical opposite of the "remove" target. --> <target name="install" depends="compile" description="Install application to servlet container"> <deploy url="${manager.url}" username="${manager.username}" password="${manager.password}" path="${app.path}" localWar="file://${build.home}"/> </target> <!-- ==================== Javadoc Target ================================== --> <!-- The "javadoc" target creates Javadoc API documentation for the Java classes included in your application. Normally, this is only required when preparing a distribution release, but is available as a separate target in case the developer wants to create Javadocs independently. --> <target name="javadoc" depends="compile" description="Create Javadoc API documentation"> <mkdir dir="${dist.home}/docs/api"/> <javadoc sourcepath="${src.home}" destdir="${dist.home}/docs/api" packagenames="*"> <classpath refid="compile.classpath"/> </javadoc> </target> <!-- ====================== List Target =================================== --> <!-- The "list" target asks the specified Tomcat 6 installation to list the currently running web applications, either loaded at startup time or installed dynamically. It is useful to determine whether or not the application you are currently developing has been installed. --> <target name="list" description="List installed applications on servlet container"> <list url="${manager.url}" username="${manager.username}" password="${manager.password}"/> </target> <!-- ==================== Prepare Target ================================== --> <!-- The "prepare" target is used to create the "build" destination directory, and copy the static contents of your web application to it. If you need to copy static files from external dependencies, you can customize the contents of this task. Normally, this task is executed indirectly when needed. --> <target name="prepare"> <!-- Create build directories as needed --> <mkdir dir="${build.home}"/> <mkdir dir="${build.home}/WEB-INF"/> <mkdir dir="${build.home}/WEB-INF/classes"/> <!-- Copy static content of this web application --> <copy todir="${build.home}"> <fileset dir="${web.home}"/> </copy> <!-- Copy external dependencies as required --> <!-- *** CUSTOMIZE HERE AS REQUIRED BY YOUR APPLICATION *** --> <mkdir dir="${build.home}/WEB-INF/lib"/> <!-- <copy todir="${build.home}/WEB-INF/lib" file="${foo.jar}"/> --> <!-- Copy static files from external dependencies as needed --> <!-- *** CUSTOMIZE HERE AS REQUIRED BY YOUR APPLICATION *** --> </target> <!-- ==================== Reload Target =================================== --> <!-- The "reload" signals the specified application Tomcat 6 to shut itself down and reload. This can be useful when the web application context is not reloadable and you have updated classes or property files in the /WEB-INF/classes directory or when you have added or updated jar files in the /WEB-INF/lib directory. NOTE: The /WEB-INF/web.xml web application configuration file is not reread on a reload. If you have made changes to your web.xml file you must stop then start the web application. --> <target name="reload" depends="compile" description="Reload application on servlet container"> <reload url="${manager.url}" username="${manager.username}" password="${manager.password}" path="${app.path}"/> </target> <!-- ==================== Remove Target =================================== --> <!-- The "remove" target tells the specified Tomcat 6 installation to dynamically remove this web application from service. NOTE: This is the logical opposite of the "install" target. --> <target name="remove" description="Remove application on servlet container"> <undeploy url="${manager.url}" username="${manager.username}" password="${manager.password}" path="${app.path}"/> </target> </project>

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  • F# for the C# Programmer

    - by mbcrump
    Are you a C# Programmer and can’t make it past a day without seeing or hearing someone mention F#?  Today, I’m going to walk you through your first F# application and give you a brief introduction to the language. Sit back this will only take about 20 minutes. Introduction Microsoft's F# programming language is a functional language for the .NET framework that was originally developed at Microsoft Research Cambridge by Don Syme. In October 2007, the senior vice president of the developer division at Microsoft announced that F# was being officially productized to become a fully supported .NET language and professional developers were hired to create a team of around ten people to build the product version. In September 2008, Microsoft released the first Community Technology Preview (CTP), an official beta release, of the F# distribution . In December 2008, Microsoft announced that the success of this CTP had encouraged them to escalate F# and it is now will now be shipped as one of the core languages in Visual Studio 2010 , alongside C++, C# 4.0 and VB. The F# programming language incorporates many state-of-the-art features from programming language research and ossifies them in an industrial strength implementation that promises to revolutionize interactive, parallel and concurrent programming. Advantages of F# F# is the world's first language to combine all of the following features: Type inference: types are inferred by the compiler and generic definitions are created automatically. Algebraic data types: a succinct way to represent trees. Pattern matching: a comprehensible and efficient way to dissect data structures. Active patterns: pattern matching over foreign data structures. Interactive sessions: as easy to use as Python and Mathematica. High performance JIT compilation to native code: as fast as C#. Rich data structures: lists and arrays built into the language with syntactic support. Functional programming: first-class functions and tail calls. Expressive static type system: finds bugs during compilation and provides machine-verified documentation. Sequence expressions: interrogate huge data sets efficiently. Asynchronous workflows: syntactic support for monadic style concurrent programming with cancellations. Industrial-strength IDE support: multithreaded debugging, and graphical throwback of inferred types and documentation. Commerce friendly design and a viable commercial market. Lets try a short program in C# then F# to understand the differences. Using C#: Create a variable and output the value to the console window: Sample Program. using System;   namespace ConsoleApplication9 {     class Program     {         static void Main(string[] args)         {             var a = 2;             Console.WriteLine(a);             Console.ReadLine();         }     } } A breeze right? 14 Lines of code. We could have condensed it a bit by removing the “using” statment and tossing the namespace. But this is the typical C# program. Using F#: Create a variable and output the value to the console window: To start, open Visual Studio 2010 or Visual Studio 2008. Note: If using VS2008, then please download the SDK first before getting started. If you are using VS2010 then you are already setup and ready to go. So, click File-> New Project –> Other Languages –> Visual F# –> Windows –> F# Application. You will get the screen below. Go ahead and enter a name and click OK. Now, you will notice that the Solution Explorer contains the following: Double click the Program.fs and enter the following information. Hit F5 and it should run successfully. Sample Program. open System let a = 2        Console.WriteLine a As Shown below: Hmm, what? F# did the same thing in 3 lines of code. Show me the interactive evaluation that I keep hearing about. The F# development environment for Visual Studio 2010 provides two different modes of execution for F# code: Batch compilation to a .NET executable or DLL. (This was accomplished above). Interactive evaluation. (Demo is below) The interactive session provides a > prompt, requires a double semicolon ;; identifier at the end of a code snippet to force evaluation, and returns the names (if any) and types of resulting definitions and values. To access the F# prompt, in VS2010 Goto View –> Other Window then F# Interactive. Once you have the interactive window type in the following expression: 2+3;; as shown in the screenshot below: I hope this guide helps you get started with the language, please check out the following books for further information. F# Books for further reading   Foundations of F# Author: Robert Pickering An introduction to functional programming with F#. Including many samples, this book walks through the features of the F# language and libraries, and covers many of the .NET Framework features which can be leveraged with F#.       Functional Programming for the Real World: With Examples in F# and C# Authors: Tomas Petricek and Jon Skeet An introduction to functional programming for existing C# developers written by Tomas Petricek and Jon Skeet. This book explains the core principles using both C# and F#, shows how to use functional ideas when designing .NET applications and presents practical examples such as design of domain specific language, development of multi-core applications and programming of reactive applications.

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  • How to build glibc 2.11.2 on RHEL5?

    - by netvope
    Using gcc-4.4.4 or 4.5.0, I'm unable to make glibc-2.11.2 on RHEL 5.5: .././scripts/mkinstalldirs /dev/shm/glibc-2.11.2-build/sunrpc/rpcsvc CPP='gcc -B/home/klaw/share/rhel5/ -E -x c-header' /dev/shm/glibc-2.11.2-build/elf/ld-linux-x86-64.so.2 --library-path /dev/shm/glibc-2.11.2-build:/dev/shm/glibc-2.11.2-build/math:/dev/shm/glibc-2.11.2-build/elf:/dev/shm/glibc-2.11.2-build/dlfcn:/dev/shm/glibc-2.11.2-build/nss:/dev/shm/glibc-2.11.2-build/nis:/dev/shm/glibc-2.11.2-build/rt:/dev/shm/glibc-2.11.2-build/resolv:/dev/shm/glibc-2.11.2-build/crypt:/dev/shm/glibc-2.11.2-build/nptl /dev/shm/glibc-2.11.2-build/sunrpc/rpcgen -Y ../scripts -c rpcsvc/bootparam_prot.x -o /dev/shm/glibc-2.11.2-build/sunrpc/xbootparam_prot.T Inconsistency detected by ld.so: dynamic-link.h: 209: elf_get_dynamic_info: Assertion `info[15] == ((void *)0)' failed! make[2]: *** [/dev/shm/glibc-2.11.2-build/sunrpc/xnlm_prot.stmp] Error 127 make[2]: Leaving directory `/dev/shm/glibc-2.11.2/sunrpc' make[1]: *** [sunrpc/others] Error 2 make[1]: Leaving directory `/dev/shm/glibc-2.11.2' make: *** [all] Error 2 The error comes from the ld.so made by glibc: $ elf/ld.so Inconsistency detected by ld.so: dynamic-link.h: 209: elf_get_dynamic_info: Assertion `info[15] == ((void *)0)' failed! $ I got similar error with glibc-2.11.1 (only the line number of dynamic-link.h is different). Any ideas how I can fix this? gcc-4.4.4 and 4.5.0 were compiled with: binutils-2.20.1 gmp-5.0.1 mpc-0.8.2 mpfr-2.4.2

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  • Changes made to cli's php.ini not taking effect

    - by Sandeepan Nath
    I have two php.ini files - /etc/php.ini which loads in case of cli /opt/lampp/etc/php.ini which loads in case of browser. I am able to use PHP's Mailparse extension after adding the line extension=mailparse.so in the /opt/lampp/etc/php.ini and restarting lampp. But I am not able to load the same in case of command line - getting PHP Fatal error: Call to undefined function mailparse_msg_create() in ... mailparse_msg_create() is a part of the Mailparse extension. I tried by relogging with the user after making the change and even restarting the system. What needs to be done so that the change takes effect. Update I checked that php -i | grep 'Configuration File' gives PHP Warning: PHP Startup: Unable to load dynamic library '/usr/lib/php/modules/mailparse.so' - /usr/lib/php/modules/mailparse.so: cannot open shared object file: No such file or directory in Unknown on line 0 Configuration File (php.ini) Path => /etc Loaded Configuration File => /etc/php.ini Update 2 I copied the mailparse.so from /opt/lampp/lib/php/extensions/no-debug-non-zts-20090626 and put it in /usr/lib/php/modules. I added extension=mailparse.so to /etc/php.ini as well. But it still showed this warning PHP Warning: PHP Startup: Unable to load dynamic library ... As told by Lekensteyn, I did ldd /usr/lib/php/modules/mailparse.so and got ldd: warning: you do not have execution permission for /usr/lib/php/modules/mailparse.so' So I gave execute permission. Then ldd /usr/lib/php/modules/mailparse.so showed linux-gate.so.1 => (0x00110000) libc.so.6 => /lib/libc.so.6 (0x0011d000) /lib/ld-linux.so.2 (0x003aa000) which looks normal. BUt now, running php command says PHP Warning: PHP Startup: Unable to load dynamic library '/usr/lib/php/modules/mailparse.so' - /usr/lib/php/modules/mailparse.so: undefined symbol: mbfl_name2no_encoding in Unknown on line 0

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  • Make dhcp assign same IP and hostname for different interfaces at one machine

    - by Egeshi
    I have a feeling that question itself looks stupid but it is not. Please let me clarify. I have dynamic DNS with BIND and NIS configured at my LAN and have laptop which I am using in both wireless and wired mode. I mean that sometimes I have to use wired interface to achieve higher throughput but most of time I don't need it and using wireless mode. Everything works great. Issue is that I want both interfaces get same IP from DHCP. Just for convenient firewall setup. If I add both hosts to dhcp in this manner # bt wireless host bt { hardware ethernet 00:1f:1f:62:60:28; fixed-address 172.16.77.110; } # bt wired host bt { hardware ethernet 00:14:22:b7:5a:de; fixed-address 172.16.77.110; } DHCP says logs following message dhcpd: Dynamic and static leases present for 172.16.77.110 dhcpd: Remove host declaration bt-wired or remove 172.16.77.110 dhcpd: from the dynamic address pool for 172.16/16 Host records are added outside of any subnet, but it makes no difference if I put them there, effect is still the same. This is not critical but either is not my whim because even if DHCP seems to work fine for that "bt" host, I cannot make connection TO it from remote machine anymore with this definitely incorrect DHCP config. I'd be thankful if one spares a minute for advice about how to configure DHCPD correctly. UPDATE. I realize that there's a soulution to assign different hostname in DHCP config but would like to use benefits of short host names.

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  • Apache MaxClients doubt

    - by Milan Babuškov
    I have a busy Apache server serving only dynamic PHP+MySQL pages. It is a prefork Apache, version 2.2.4 with following config: KeepAlive off StartServers 8 MinSpareServers 32 MaxSpareServers 64 ServerLimit 512 MaxClients 512 MaxRequestsPerChild 4000 MaxClients/ServerLimit used to be set to 256, but I got the following error in error_log so I increased it: [error] server reached MaxClients setting, consider raising the MaxClients setting It seems to work now, but I have a doubt. Looking at MySQL log of queries, I have a couple hundred clients per seconds, but "ps ax" only shows 8, 9 or 10 processes running: [root@engine ~]# ps ax | grep http | wc -l 10 I even got this many processes when the above error message was shown in error_log. This made me investigate further. When I run netstat -a, I get something like this: tcp 0 0 engine:http adsl-105-143.teol.net:21453 TIME_WAIT tcp 0 0 engine:http 118-36.static.kds:mck-ivpip TIME_WAIT tcp 0 0 engine:http 118-36.static:oce-snmp-trap TIME_WAIT tcp 0 0 engine:http 118-36.static.kd:unifyadmin TIME_WAIT tcp 0 0 engine:http cable-188-2-25-29.dyna:4906 TIME_WAIT tcp 0 0 engine:http adsl-105-143.teol.net:21458 TIME_WAIT tcp 0 0 engine:http 109-92-83-91.dynamic.:62821 TIME_WAIT tcp 0 0 engine:http cable-89-216-142-192.:63576 TIME_WAIT tcp 0 0 engine:http 109-92-83-91.dynamic.:62819 TIME_WAIT tcp 1081 0 engine:http pttnetadsl38-36.ptt.r:50496 ESTABLISHED tcp 0 0 engine:http cable-188-2-36-196.dyn:4136 TIME_WAIT tcp 0 0 engine:http cable-89-216-142-192.:63580 TIME_WAIT tcp 0 0 engine:http cable-89-216-142-192.:63581 TIME_WAIT etc. When counting those, I get: [root@engine ~]# netstat -a | grep http | wc -l 431 Can anyone tell me what is really going on here and how to make sure my server keeps working, because I only use 50% of available RAM in machine?

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  • Scaling a node.js application, nginx as a base server, but varnish or redis for caching?

    - by AntelopeSalad
    I'm not close to being well versed in using nginx or varnish but this is my setup at the moment. I have a node.js server running which is serving either json, html templates, or socket.io events. Then I have nginx running in front of node which is serving all static content (css, js, etc.). At this point I would like to cache both static content and dynamic content to memory. It's to my understanding that varnish can cache static content quite well and it wouldn't require touching my application code. I also think it's capable of caching dynamic content too but there cannot be any cookie headers? I do use redis at the moment for holding session data and planned to use it for other things in the future like keeping track of non-crucial but fun stats. I just have no idea how I should handle caching everything on the site. I think it comes down to these options but there might be more: Throw varnish in front of nginx and let varnish cache static pages, no app code changes. Redis would cache dynamic db calls which would require modifying my app code. Ignore using varnish completely and let redis handle caching everything, then use one of the nginx-redis modules. I'm not sure if this would require a lot of app code changes (for the static files). I'm not having any luck finding benchmarks that compare nginx+varnish vs nginx+redis and I'm too inexperienced to bench it myself (high chances of my configs being awful). I'm basically looking for the solution that would be the most efficient in terms of req/sec and scalable in the future (throw new hardware at the problem + maybe adjust some values in a config = new servers up and running semi-painlessly).

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  • Designing a persistent asynchronous TCP protocol

    - by dogglebones
    I have got a collection of web sites that need to send time-sensitive messages to host machines all over my metro area, each on its own generally dynamic IP. Until now, I have been doing this the way of the script kiddie: Each host machine runs an (s)FTP server, or an HTTP(s) server, and correspondingly has a certain port opened up by its gateway. Each host machine runs a program that watches a certain folder and automatically opens or prints or exec()s when a new file of a given extension shows up. Dynamic IP addresses are accommodated using a dynamic DNS service. Each web site does cURL or fsockopen or whatever and communicates directly with its recipient as-needed. This approach has been suprisingly reliable, however obvious issues have come up and the situation needs to be addressed. As stated, these messages are time-sensitive and failures need to be detected within minutes of submission by end-users. What I'm doing is building a messaging protocol. It will run on a machine and connection in my control. As far as the service is concerned, there is no distinction between web site and host machine -- there is only one device sending a message to another device. So that's where I'm at right now. I've got a skeleton server and a skeleton client. They can negotiate high-quality authentication and encryption. The (TCP) connection is persistent and asynchronous, and can handle delimited (i.e., read until \r\n or whatever) as well as length-prefixed (i.e., read exactly n bytes) messages. Unless somebody gives me a better idea, I think I'll handle messages as byte arrays. So I'm looking for suggestions on how to model the protocol itself -- at the application level. I'll mostly be transferring XML and DLM type files, as well as control messages for things like "handshake" and "is so-and-so online?" and so forth. Is there anything really stupid in my train of thought? Or anything I should read about before I get started? Stuff like that -- please and thanks.

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  • Can't start my phpMyAdmin

    - by vrynxzent
    i am creating my own portable server but i can't make it to run the phpMyAdmin, the mysql, php and apache is running except for phpMyAdmin. When i check Apache's error log, it states [Fri Nov 09 08:54:37 2012] [warn] pid file F:/Drive WebServer/Drive WebServer/bin/Debug/Apache2bak/logs/httpd.pid overwritten -- Unclean shutdown of previous Apache run? PHP Warning: PHP Startup: Unable to load dynamic library './php_mysql.dll' - The specified module could not be found.\r\n in Unknown on line 0 PHP Warning: PHP Startup: Unable to load dynamic library './php_mysqli.dll' - The specified module could not be found.\r\n in Unknown on line 0 [Fri Nov 09 08:54:37 2012] [notice] Apache/2.0.64 (Win32) PHP/5.2.17 configured -- resuming normal operations [Fri Nov 09 08:54:37 2012] [notice] Server built: Oct 18 2010 01:36:23 [Fri Nov 09 08:54:37 2012] [notice] Parent: Created child process 6784 i manually assign the exact path for this F:/php/ext/php_mysql.dll PHP Warning: PHP Startup: Unable to load dynamic library 'F:/php/ext/php_mysql.dll' - The specified module could not be found.\r\n in Unknown on line 0 but still the same error. i set this option in php.ini extension_dir = "./" another error goes pops out It says libmysql.dll is missing. PHP Version : 5.2.17 Any help would be appreciated. ;)

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  • Primefaces TreeView node expansion

    - by Boiler Bill
    Being new to primefaces, I have been researching a way to have TreeView in dynamic mode update a separate tab pane given the id on Node expansion. This works great for node selection with the "update" attribute. Can it work the same way on Node Expansion was well? Here is my code that works when a node is selected: <p:tree id="tree" dynamic="true" var="node" cache="true" update="details" value="#{treeBean.root}" rendered="#{treeBean.root != null}" styleClass="inventoryTree" nodeExpandListener="#{treeBean.onNodeExpand}" nodeSelectListener="#{treeBean.onNodeSelect}">

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  • Specify the search path for DllImport in .NET

    - by Stefan
    Is there a way to specify the paths to be searched for a given assembly that is imported with DllImport? [DllImport("MyDll.dll")] static extern void Func(); This will search for the dll in the app dir and in the PATH environment variable. But at times the dll will be placed elsewhere. Can this information be specified in app.config or manifest file to avoid dynamic loading and dynamic invocation?

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  • asp.net hover menu item

    - by WtFudgE
    When I hover on a static menu item that has a dynamic menu, the hover styles are in effect but once I start navigating the dynamic menu the static menu item goes back to the non-hover styles. Does anyone know how to make them stick until I stop ''using' that menu? I tried the 'selected' static menu item styles but that doesn't work - if I use them, even when I stop navigating the menu the last selected static menu item will display the selected style - after using the menu I want the styles to revert to the normal styles....

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  • Is there a measurestring equivalent in Silverlight xaml?

    - by Roy
    What I am trying to accomplish: Create a dynamic bubble that expands on height and width depending on the text in the bubble. What I researched so far: In an so article they described the measurestring to figure out the exact width or height so dynamic changes in the .cs to the width and height can be accomplished. Is there something like this in Silverlight? Is my only option to utilize the myTxt.Text.length and then change the myGrid.height and myGrid.width to leave wasted space to accommodate all cases?

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  • Asp.net MVC VirtualPathProvider views parse error

    - by madcapnmckay
    Hi, I am working on a plugin system for Asp.net MVC 2. I have a dll containing controllers and views as embedded resources. I scan the plugin dlls for controller using StructureMap and I then can pull them out and instantiate them when requested. This works fine. I then have a VirtualPathProvider which I adapted from this post public class AssemblyResourceProvider : VirtualPathProvider { protected virtual string WidgetDirectory { get { return "~/bin"; } } private bool IsAppResourcePath(string virtualPath) { var checkPath = VirtualPathUtility.ToAppRelative(virtualPath); return checkPath.StartsWith(WidgetDirectory, StringComparison.InvariantCultureIgnoreCase); } public override bool FileExists(string virtualPath) { return (IsAppResourcePath(virtualPath) || base.FileExists(virtualPath)); } public override VirtualFile GetFile(string virtualPath) { return IsAppResourcePath(virtualPath) ? new AssemblyResourceVirtualFile(virtualPath) : base.GetFile(virtualPath); } public override CacheDependency GetCacheDependency(string virtualPath, IEnumerable virtualPathDependencies, DateTime utcStart) { return IsAppResourcePath(virtualPath) ? null : base.GetCacheDependency(virtualPath, virtualPathDependencies, utcStart); } } internal class AssemblyResourceVirtualFile : VirtualFile { private readonly string path; public AssemblyResourceVirtualFile(string virtualPath) : base(virtualPath) { path = VirtualPathUtility.ToAppRelative(virtualPath); } public override Stream Open() { var parts = path.Split('/'); var resourceName = Path.GetFileName(path); var apath = HttpContext.Current.Server.MapPath(Path.GetDirectoryName(path)); var assembly = Assembly.LoadFile(apath); return assembly != null ? assembly.GetManifestResourceStream(assembly.GetManifestResourceNames().SingleOrDefault(s => string.Compare(s, resourceName, true) == 0)) : null; } } The VPP seems to be working fine also. The view is found and is pulled out into a stream. I then receive a parse error Could not load type 'System.Web.Mvc.ViewUserControl<dynamic>'. which I can't find mentioned in any previous example of pluggable views. Why would my view not compile at this stage? Thanks for any help, Ian EDIT: Getting closer to an answer but not quite clear why things aren't compiling. Based on the comments I checked the versions and everything is in V2, I believe dynamic was brought in at V2 so this is fine. I don't even have V3 installed so it can't be that. I have however got the view to render, if I remove the <dynamic> altogether. So a VPP works but only if the view is not strongly typed or dynamic This makes sense for the strongly typed scenario as the type is in the dynamically loaded dll so the viewengine will not be aware of it, even though the dll is in the bin. Is there a way to load types at app start? Considering having a go with MEF instead of my bespoke Structuremap solution. What do you think?

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  • Opening link in new window

    - by kedar kamthe
    I am working on a CMS site that uses dynamic navigation. There is one link on the site that I would like to be able to open in a new window. However, since this is a dynamic environment I can't add the standard, target="_blank" to the link. so how can i open the link in new window without using jquery ?

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  • ctypes for static libraries?

    - by Begbie00
    Hi all - I'm attempting to write a Python wrapper for poker-eval, a c static library. All the documentation I can find on ctypes indicates that it works on shared/dynamic libraries. Is there a ctypes for static libraries? I know about cython, but should I use that or recompile the poker-eval into a dynamic library so that I can use ctypes? Thanks, Mike

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  • pathinfo vs fnmatch

    - by zaf
    There was a small debate regarding the speed of fnmatch over pathinfo here : http://stackoverflow.com/questions/2692536/how-to-check-if-file-is-php I wasn't totally convinced so decided to benchmark the two functions. Using dynamic and static paths showed that pathinfo was faster. Is my benchmarking logic and conclusion valid? I include a sample of the results which are in seconds for 100,000 iterations on my machine : dynamic path pathinfo 3.79311800003 fnmatch 5.10071492195 x1.34 static path pathinfo 1.03921294212 fnmatch 2.37709188461 x2.29 Code: <pre> <?php $iterations=100000; // Benchmark with dynamic file path print("dynamic path\n"); $i=$iterations; $t1=microtime(true); while($i-->0){ $f='/'.uniqid().'/'.uniqid().'/'.uniqid().'/'.uniqid().'.php'; if(pathinfo($f,PATHINFO_EXTENSION)=='php') $d=uniqid(); } $t2=microtime(true) - $t1; print("pathinfo $t2\n"); $i=$iterations; $t1=microtime(true); while($i-->0){ $f='/'.uniqid().'/'.uniqid().'/'.uniqid().'/'.uniqid().'.php'; if(fnmatch('*.php',$f)) $d=uniqid(); } $t3 = microtime(true) - $t1; print("fnmatch $t3\n"); print('x'.round($t3/$t2,2)."\n\n"); // Benchmark with static file path print("static path\n"); $f='/'.uniqid().'/'.uniqid().'/'.uniqid().'/'.uniqid().'.php'; $i=$iterations; $t1=microtime(true); while($i-->0) if(pathinfo($f,PATHINFO_EXTENSION)=='php') $d=uniqid(); $t2=microtime(true) - $t1; print("pathinfo $t2\n"); $i=$iterations; $t1=microtime(true); while($i-->0) if(fnmatch('*.php',$f)) $d=uniqid(); $t3=microtime(true) - $t1; print("fnmatch $t3\n"); print('x'.round($t3/$t2,2)."\n\n"); ?> </pre>

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