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  • compiling php5.4 on macosx 10.6.8

    - by ling
    I'm trying to compile php 5.4.7 on mac osx 10.6.8. I could install it using the default procedure: ./configure \ --prefix=/usr/local \ --with-config-file-path=/usr/local/etc \ --with-apxs2=/usr/local/apache2/bin/apxs \ --with-mysql sudo make clean sudo make sudo make install But now if I try to install to compile php with the curl module it fails: ./configure \ --prefix=/usr/local \ --with-config-file-path=/usr/local/etc \ --with-curl=/usr \ --with-apxs2=/usr/local/apache2/bin/apxs \ --with-mysql sudo make clean sudo make = last lines of make output: Undefined symbols: "_CRYPTO_set_locking_callback", referenced from: _zm_shutdown_curl in interface.o _zm_startup_curl in interface.o "_CRYPTO_num_locks", referenced from: _zm_shutdown_curl in interface.o _zm_startup_curl in interface.o "_CRYPTO_get_id_callback", referenced from: _zm_startup_curl in interface.o "_CRYPTO_set_id_callback", referenced from: _zm_shutdown_curl in interface.o _zm_startup_curl in interface.o ld: symbol(s) not found collect2: ld returned 1 exit status make: * [libs/libphp5.bundle] Error 1 I read somewhere ( http://user.xmission.com/~georgeps/documentation/tutorials/compilation_and_makefiles.html ) that in this case, I should tell the compiler where to find the missing library, so that it can links the missing files. The problem is that I don't what library I should look for, is it libssl2 ?

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  • Segmentation fault while switching QCompleter for QLineEdit [on hold]

    - by san
    I have a QLineEdit that uses autocompletion one which on focusIn event in which it shows paths from XML List(here I have used hardcoded list) but if user doesn't find the path from that list popped by QCompleter than I want user to be able to browse to path typing '/' in QLineEdit , I am not able to select the paths say /Users etc and on trying to type Segmentation fault occurs. from PyQt4.Qt import Qt, QObject,QLineEdit from PyQt4.QtCore import pyqtSlot,SIGNAL,SLOT from PyQt4 import QtGui, QtCore import sys class DirLineEdit(QLineEdit, QtCore.QObject): """docstring for DirLineEdit""" def __init__(self): super(DirLineEdit, self).__init__() self.defaultList = ['~/Development/python/searchMethod', '~/Development/Nuke_python', '~/Development/python/openexr', '~/Development/python/cpp2python'] self.textChanged.connect(self.__dirCompleter) def focusInEvent(self, event): if len(self.text()) == 0: self._pathsList() QtGui.QLineEdit.focusInEvent(self, event) self.completer().complete() def __dirCompleter(self): if len(self.text()) == 0: model = MyListModel(self.defaultList, self) completer = QtGui.QCompleter(model, self) completer.setModel(model) else: dirModel = QtGui.QFileSystemModel() dirModel.setRootPath(QtCore.QDir.currentPath()) dirModel.setFilter(QtCore.QDir.AllDirs | QtCore.QDir.NoDotAndDotDot | QtCore.QDir.Files) dirModel.setNameFilterDisables(0) completer = QtGui.QCompleter(dirModel, self) completer.setCaseSensitivity(QtCore.Qt.CaseInsensitive) completer.setModel(dirModel) self.setCompleter(completer) def _pathsList(self): completerList = QtCore.QStringList() for i in self.defaultList: completerList.append(QtCore.QString(i)) lineEditCompleter = QtGui.QCompleter(completerList) lineEditCompleter.setCompletionMode(QtGui.QCompleter.UnfilteredPopupCompletion) self.setCompleter(lineEditCompleter) class MyListModel(QtCore.QAbstractListModel): def __init__(self, datain, parent=None, *args): """ datain: a list where each item is a row """ QtCore.QAbstractTableModel.__init__(self, parent, *args) self.listdata = datain def rowCount(self, parent=QtCore.QModelIndex()): return len(self.listdata) def data(self, index, role): if index.isValid() and role == QtCore.Qt.DisplayRole: return QtCore.QVariant(self.listdata[index.row()]) else: return QtCore.QVariant() app = QtGui.QApplication(sys.argv) smObj = DirLineEdit() smObj.show() app.exec_() Please help fix this or suggest better way of implementation?

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  • Unable to load memcache.so extension ??

    - by billyduc
    I built php from source with configure command : './configure' '--prefix=/usr/local/php-5.2.8' '--with-config-file-path=/etc --with-config-file-scan-dir=/etc/php.d' '--with-apxs2=/usr/local/httpd/bin/apxs' '--with-mysql=/usr/local/mysql/' '--with-zlib' I installed php memcache extension : wget http://pecl.php.net/get/memcache tar -zxvf memcache-2.2.5.tgz cd memcache-2.2.5 phpize ./configure --enable-memcache make make install I add to my /usr/local/lib/php.in extension=memcache.so Rebooted my apache and run php-m but php seem doesn't load memcache extension I followed this solution from this site http://www.howtoforge.com/forums/showthread.php?t=26554 I added full path extension=/usr/local/lib/php/extensions/no-debug-non-zts-20060613/memcache.so rebooted apache But it didn't load memcache extension ! I google around but the same issue ! How can I load this extension _ _"

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  • Installing a program on Linux: providing a short command

    - by rwallace
    Suppose you're distributing a program to run on Linux, call it Foo, and the program executable is called foo.exe (because it's a CLR program so it runs under Mono) and it needs a couple of DLLs in the same directory and maybe a later version might need some data files that it reads on startup and whatever, so relocating it to a global bin directory is a bit of hassle and it really prefers to remain in its original directory... But the user would prefer to invoke the program by typing foo instead of mono /path/to/foo.exe. What's the best/most usual way to provide such a short command? Can/should an install script/makefile create a one line script called foo that invokes the full path, and put the one line script in a global bin directory? If so, what should be the target bin directory, and are there any directions about exactly how to do this? Or is there a preferred alternative?

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  • X Session from Mac

    - by tekknolagi
    How can I log into an X server from Mac OS X? I know that ssh -X username@host will log me in and I will have the capability to run X applications. On Cygwin/X you can log in and have a whole X session from your computer... and it will look something like this: How can I replicate this? Using this batch script: @echo off SET DISPLAY=127.0.0.1:0.0 SET REMOTE_HOST=%1 IF "%REMOTE_HOST%" == "" SET REMOTE_HOST=10.0.0.1 SET CYGWIN_ROOT=\cygwin SET RUN=%CYGWIN_ROOT%\bin\run -p /usr/bin SET PATH=.;%CYGWIN_ROOT%\bin;%PATH% SET XAPPLRESDIR= SET XCMSDB= SET XKEYSYMDB= SET XNLSPATH= if not exist %CYGWIN_ROOT%\tmp\.X11-unix\X0 goto CLEANUP-FINISH attrib -s %CYGWIN_ROOT%\tmp\.X11-unix\X0 del %CYGWIN_ROOT%\tmp\.X11-unix\X0 :CLEANUP-FINISH if exist %CYGWIN_ROOT%\tmp\.X11-unix rmdir %CYGWIN_ROOT%\tmp\.X11-unix if "%OS%" == "Windows_NT" goto OS_NT echo startxdmcp.bat - Starting on Windows 95/98/Me goto STARTUP :OS_NT REM Windows NT/2000/XP echo startxdmcp.bat - Starting on Windows NT/2000/XP :STARTUP %RUN% XWin -query tekknolagi.dyndns.org -clipboard -lesspointer -scrollbars -screen 0 1050x1655@2 -screen 1 1680x985@1

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  • Tweaking log4net Settings Programmatically

    - by PSteele
    A few months ago, I had to dynamically add a log4net appender at runtime.  Now I find myself in another log4net situation.  I need to modify the configuration of my appenders at runtime. My client requires all files generated by our applications to be saved to a specific location.  This location is determined at runtime.  Therefore, I want my FileAppenders to log their data to this specific location – but I won't know the location until runtime so I can't add it to the XML configuration file I'm using. No problem.  Bing is my new friend and returned a couple of hits.  I made a few tweaks to their LINQ queries and created a generic extension method for ILoggerRepository (just a hunch that I might want this functionality somewhere else in the future – sorry YAGNI fans): public static void ModifyAppenders<T>(this ILoggerRepository repository, Action<T> modify) where T:log4net.Appender.AppenderSkeleton { var appenders = from appender in log4net.LogManager.GetRepository().GetAppenders() where appender is T select appender as T;   foreach (var appender in appenders) { modify(appender); appender.ActivateOptions(); } } Now I can easily add the proper directory prefix to all of my FileAppenders at runtime: log4net.LogManager.GetRepository().ModifyAppenders<FileAppender>(a => { a.File = Path.Combine(settings.ConfigDirectory, Path.GetFileName(a.File)); }); Thanks beefycode and Wil Peck. Technorati Tags: .NET,log4net,LINQ

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  • How do you create a bootable partition on a USB drive?

    - by Nathan DeWitt
    I have a bootable ISO designed to be burned to a double-layer DVD. I don't have a double layer DVD burner, so I would like to stick the ISO image on a 50 GB partition on a USB hard drive I have. How do I get the boot info onto the hard drive? If it helps, it's an OSx86 Live CD. Attempt 1: booted into Ubuntu 9.04 LiveCD deleted the partition on my existing USB hard drive sudo dd if=/path/to/image.iso of=/dev/MyUSB booted to USB drive error: Error Loading OS Atempt 2: booted into Ubuntu 9.04 LiveCD deleted the partition on my existing USB hard drive sudo mkdosfs -I -v -n iPC /dev/MyUSB sudo syslinux /dev/MyUSB sudo dd if=/path/to/image.iso of=/dev/MyUSB booted to USB drive error: Selected boot device not available - strike F1 to retry boot, F2 for setup utility

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  • Is it OK to use dynamic typing to reduce the amount of variables in scope?

    - by missingno
    Often, when I am initializing something I have to use a temporary variable, for example: file_str = "path/to/file" file_file = open(file) or regexp_parts = ['foo', 'bar'] regexp = new RegExp( regexp_parts.join('|') ) However, I like to reduce the scope my variables to the smallest scope possible so there is less places where they can be (mis-)used. For example, I try to use for(var i ...) in C++ so the loop variable is confined to the loop body. In these initialization cases, if I am using a dynamic language, I am then often tempted to reuse the same variable in order to prevent the initial (and now useless) value from being used latter in the function. file = "path/to/file" file = open(file) regexp = ['...', '...'] regexp = new RegExp( regexp.join('|') ) The idea is that by reducing the number of variables in scope I reduce the chances to misuse them. However this sometimes makes the variable names look a little weird, as in the first example, where "file" refers to a "filename". I think perhaps this would be a non issue if I could use non-nested scopes begin scope1 filename = ... begin scope2 file = open(filename) end scope1 //use file here //can't use filename on accident end scope2 but I can't think of any programming language that supports this. What rules of thumb should I use in this situation? When is it best to reuse the variable? When is it best to create an extra variable? What other ways do we solve this scope problem?

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  • DELL DRAC & Ubuntu VPN Connection

    - by Mikunos
    I am trying to connect to a DELL DRAC card without success by Ubuntu VPN Connection Manager. I have these data: Protocol: PPTP SERVER IP PPTP: 1233.123.123.123 DRAC IP: 192.168.10.25 Subnet: 255.255.0.0 User: myuser Pass: mypass where have I to write these parameters? I have configured the PPTP connection using the graphical tool in Ubuntu 11.10 ... but in the /var/log/syslog I get these messages: Apr 15 11:33:15 shinet NetworkManager[1035]: <info> Starting VPN service 'pptp'... Apr 15 11:33:15 shinet NetworkManager[1035]: <info> VPN service 'pptp' started (org.freedesktop.NetworkManager.pptp), PID 18180 Apr 15 11:33:15 shinet NetworkManager[1035]: <info> VPN service 'pptp' appeared; activating connections Apr 15 11:33:15 shinet NetworkManager[1035]: <info> VPN plugin state changed: 3 Apr 15 11:33:15 shinet NetworkManager[1035]: <info> VPN connection 'Connessione VPN 1' (Connect) reply received. Apr 15 11:33:15 shinet pppd[18182]: Plugin /usr/lib/pppd/2.4.5/nm-pptp-pppd-plugin.so loaded. Apr 15 11:33:15 shinet pppd[18182]: pppd 2.4.5 started by root, uid 0 Apr 15 11:33:15 shinet pppd[18182]: Using interface ppp0 Apr 15 11:33:15 shinet pppd[18182]: Connect: ppp0 <--> /dev/pts/1 Apr 15 11:33:15 shinet NetworkManager[1035]: SCPlugin-Ifupdown: devices added (path: /sys/devices/virtual/net/ppp0, iface: ppp0) Apr 15 11:33:15 shinet NetworkManager[1035]: SCPlugin-Ifupdown: device added (path: /sys/devices/virtual/net/ppp0, iface: ppp0): no ifupdown configuration found. Apr 15 11:33:15 shinet pptp[18185]: nm-pptp-service-18180 log[main:pptp.c:314]: The synchronous pptp option is NOT activated Apr 15 11:33:46 shinet pppd[18182]: LCP: timeout sending Config-Requests Apr 15 11:33:46 shinet pppd[18182]: Connection terminated. Apr 15 11:33:46 shinet avahi-daemon[1081]: Withdrawing workstation service for ppp0. Apr 15 11:33:46 shinet NetworkManager[1035]: SCPlugin-Ifupdown: devices removed (path: /sys/devices/virtual/net/ppp0, iface: ppp0) Apr 15 11:33:46 shinet NetworkManager[1035]: <warn> VPN plugin failed: 1 Apr 15 11:33:46 shinet pppd[18182]: Modem hangup Apr 15 11:33:46 shinet NetworkManager[1035]: <warn> VPN plugin failed: 1 Apr 15 11:33:51 shinet pppd[18182]: Exit. Apr 15 11:33:51 shinet NetworkManager[1035]: <warn> VPN plugin failed: 1 Apr 15 11:33:51 shinet NetworkManager[1035]: <info> VPN plugin state changed: 6 Apr 15 11:33:51 shinet NetworkManager[1035]: <info> VPN plugin state change reason: 0 Apr 15 11:33:51 shinet NetworkManager[1035]: <warn> error disconnecting VPN: Could not process the request because no VPN connection was active. Apr 15 11:33:51 shinet NetworkManager[1035]: <info> Policy set 'Wired connection 1' (eth0) as default for IPv4 routing and DNS. Apr 15 11:33:57 shinet NetworkManager[1035]: <info> VPN service 'pptp' disappeared Thanks

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  • Can I make ssh tell me which control file it would use for multiplexing?

    - by Ryan Thompson
    I am using the following options in my ~/.ssh/config in order to enable connection multiplexing: ControlMaster auto ControlPath ~/.ssh/control/master-%r@%h:%p However, this has the annoying problem that the first shell to connect to a particular server must be the last to disconnect, because it is the master connection that all the other connections are using. So if you log out of the master, it appears to just hang. To solve this, I would like to wrap ssh with a script that checks if the control master file exists, and if not, starts a master ssh process in the background. Then it would start a slave ssh session. In order to accomplish this, my script would have to determine the path to the control file that ssh would use. This would entail parsing the ssh command line options and config files and implementing the logic for determining the ControlPath. Is there any way to just ask ssh what path it would use, so I can check it?

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  • Asynchrony in C# 5 (Part I)

    - by javarg
    I’ve been playing around with the new Async CTP preview available for download from Microsoft. It’s amazing how language trends are influencing the evolution of Microsoft’s developing platform. Much effort is being done at language level today than previous versions of .NET. In these post series I’ll review some major features contained in this release: Asynchronous functions TPL Dataflow Task based asynchronous Pattern Part I: Asynchronous Functions This is a mean of expressing asynchronous operations. This kind of functions must return void or Task/Task<> (functions returning void let us implement Fire & Forget asynchronous operations). The two new keywords introduced are async and await. async: marks a function as asynchronous, indicating that some part of its execution may take place some time later (after the method call has returned). Thus, all async functions must include some kind of asynchronous operations. This keyword on its own does not make a function asynchronous thought, its nature depends on its implementation. await: allows us to define operations inside a function that will be awaited for continuation (more on this later). Async function sample: Async/Await Sample async void ShowDateTimeAsync() {     while (true)     {         var client = new ServiceReference1.Service1Client();         var dt = await client.GetDateTimeTaskAsync();         Console.WriteLine("Current DateTime is: {0}", dt);         await TaskEx.Delay(1000);     } } The previous sample is a typical usage scenario for these new features. Suppose we query some external Web Service to get data (in this case the current DateTime) and we do so at regular intervals in order to refresh user’s UI. Note the async and await functions working together. The ShowDateTimeAsync method indicate its asynchronous nature to the caller using the keyword async (that it may complete after returning control to its caller). The await keyword indicates the flow control of the method will continue executing asynchronously after client.GetDateTimeTaskAsync returns. The latter is the most important thing to understand about the behavior of this method and how this actually works. The flow control of the method will be reconstructed after any asynchronous operation completes (specified with the keyword await). This reconstruction of flow control is the real magic behind the scene and it is done by C#/VB compilers. Note how we didn’t use any of the regular existing async patterns and we’ve defined the method very much like a synchronous one. Now, compare the following code snippet  in contrast to the previuous async/await: Traditional UI Async void ComplicatedShowDateTime() {     var client = new ServiceReference1.Service1Client();     client.GetDateTimeCompleted += (s, e) =>     {         Console.WriteLine("Current DateTime is: {0}", e.Result);         client.GetDateTimeAsync();     };     client.GetDateTimeAsync(); } The previous implementation is somehow similar to the first shown, but more complicated. Note how the while loop is implemented as a chained callback to the same method (client.GetDateTimeAsync) inside the event handler (please, do not do this in your own application, this is just an example).  How it works? Using an state workflow (or jump table actually), the compiler expands our code and create the necessary steps to execute it, resuming pending operations after any asynchronous one. The intention of the new Async/Await pattern is to let us think and code as we normally do when designing and algorithm. It also allows us to preserve the logical flow control of the program (without using any tricky coding patterns to accomplish this). The compiler will then create the necessary workflow to execute operations as the happen in time.

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  • Run Bash Script Another Server

    - by psce
    I want to run command one by one, for change the names of the directories on the server. When I run script, directories renamed in server 1. But, directories are not found in server 2. What the error could be in the script? Script; #!/bin/bash mach_directory=/home/user/example erase_dir1=cache erase_dir2=tmp for i in {0..10} do user=user server=$(ssh $user@server$i hostname) ssh $user@$server find $mach_directory -type d -name $erase_dir1 ! -path "*Admin/$erase_dir1*" -print0 | while IFS= read -r -d '' file ; do mv "$file" "${file}_$(date +%d%m%Y)"; done ssh $user@$server find $mach_directory -type d -name $erase_dir2 ! -path "*Admin/$erase_dir2*" -print0 | while IFS= read -r -d '' file ; do mv "$file" "${file}_$(date +%d%m%Y)"; done done

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  • How to pass an argument to a Windows Scheduled Task with spaces in it

    - by Rodney
    I need to set up a Windows Scheduled Task. It accepts 1 parameter/argument which is a path and can contain spaces. My Scheduled task does not work - it "breaks" the parameter up at the first space. If I run it in the Command Prompt I can just wrap the argument in " " and it works fine, however, this does not work in the Scheduled Task UI. e.g. C:\Program Files\xyz\FTP File Transfer\FTPFileTransferTask.exe "C:\Program Files\xyz\The Interface\Folder Path" I have tried wrapping the argument with " " ' ' [ ] () and have tried filling in the spaces with %20, ~1 etc. with no luck. I know of one solution to make a bat file and use " " around my argument but I don't want to add more complexity. I tried it on Windows 7 and Windows 2008 Server and both failed. There seems to be no discussions on this?

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  • qemu/virt-manager no permisson on shared folder

    - by TomAtToe
    I have a strange problem. Iam trying to create a shared folder via the add-hardware-filesystem option. For Type and Modus i choose Passtrought and for Driver Path. The Source Path is /free and target is mytag. I mount it with: mount -t 9p -o trans=virtio mytag /mnt/test -oversion=9p2000.L Everything worked without problems. But when i enter /mnt/test and do a ls, i get "ls: Öffnen von Verzeichnis . nicht möglich: Keine Berechtigung" in english something like "ls: cant open folder . no permission" I set permissions of /free to 777 recursivly but nothing changed. Also tried some other modes in virt-manager but nothing changes. Do you have any clues, what i am doing wrong? The guest-os ist Ubuntu 12.04 and the host-os is Ubuntu 11.10 Thank you for your help.

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  • What types of programming contest problems are there?

    - by Alex
    Basically, I want to make a great reference for use with programming contests that would have all of the algorithms that I can put together that I would need during a contest as well as sample useage for the code. I'm planning on making this into a sort of book that I could print off and take with me to competitions. I would like to do this rather than simply bringing other books (such as Algorithms books) because I think that I will learn a lot more by going over all of the algorithms myself as well as I would know exactly what I have in the book, making it more efficient to have and use. So, I've been doing research to determine what types of programming problems and algorithms are common on contests, and the only thing I can really find is this (which I have seen referenced a few times): Hal Burch conducted an analysis over spring break of 1999 and made an amazing discovery: there are only 16 types of programming contest problems! Furthermore, the top several comprise almost 80% of the problems seen at the IOI. Here they are: Dynamic Programming Greedy Complete Search Flood Fill Shortest Path Recursive Search Techniques Minimum Spanning Tree Knapsack Computational Geometry Network Flow Eulerian Path Two-Dimensional Convex Hull BigNums Heuristic Search Approximate Search Ad Hoc Problems The most challenging problems are Combination Problems which involve a loop (combinations, subsets, etc.) around one of the above algorithms - or even a loop of one algorithm with another inside it. These seem extraordinarily tricky to get right, even though conceptually they are ``obvious''. Now that's good and all, but that study was conducted in 1999, which was 13 years ago! One thing I know is that there are no BigNums problems any more (as Java has a BigInteger class, they have stopped making those problems). So, I'm wondering if anyone knows of any more recent studies of the types of problems that may be seen in a programming contest? Or what the most helpful algorithms on contests would be?

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  • Apache ProxyPass ignore static files

    - by virtualeyes
    Having an issue with Apache front server connecting to a Jetty application server. I thought that ProxyPass ! in a location block was supposed to NOT pass on processing to the application server, but for some reason that is not happening in my case, Jetty shows a 404 on the missing statics (js, css, etc.) Here's my Apache (v 2.4, BTW) virtual host block: DocumentRoot /path/to/foo ServerName foo.com ServerAdmin [email protected] RewriteEngine On <Directory /path/to/foo> AllowOverride None Require all granted </Directory> ProxyRequests Off ProxyVia Off ProxyPreserveHost On <Proxy *> AddDefaultCharset off Order deny,allow Allow from all </Proxy> # don't pass through requests for statics (image,js,css, etc.) <Location /static/> ProxyPass ! </Location> <Location /> ProxyPass http://localhost:8081/ ProxyPassReverse http://localhost:8081/ SetEnv proxy-sendchunks 1 </Location>

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  • Using PowerShell, in Active Direcotry, how would I change all the DNS A records that have a given IP to a new IP?

    - by djsumdog
    We've been moving data centers and I have a lot of old records that were not correctly but in DNS as CNAME records, but A records that have a direct IP (e.g. 192.168.100.n) and they're all moving to a new subnet (10.19.100.n). I just need to write a powershell script to change all those records. I found this site: http://www.indented.co.uk/index.php/2008/12/30/administering-microsoft-dns-in-powershell/ and from it I made this simple script: $dnsServer = "meldc2" $scope = New-Object Management.ManagementScope("\\$dnsServer\root\MicrosoftDNS") $path = New-Object Management.ManagementPath("MicrosoftDNS_Zone") $options = New-Object Management.ObjectGetOptions($Null,[System.TimeSpan]::MaxValue, $True) $ZoneClass= New-Object Management.ManagementClass($scope,$path,$options) $Zones = Get-WMIObject -Computer $dnsServer -Namespace "root\MicrosoftDNS" -Class "MicrosoftDNS_Zone" $Zones | Get-Member foreach($Z in $Zones) { $Z | Select-Object Name,DsIntegrated,ZoneType,Reverse,Data } but that only gets me a listing of root zones. I don't understand how to iterate over all the entries in each of the zones. Also, all the examples I've seen involve adding new zones, but there aren't any examples I can find on modifying existing A records.

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  • Setting XSL-FO XML Schema in Visual Studio

    - by Lukasz Kurylo
    I'm playing lately with an XSL-FO for generating a pdf documents. XSL-FO has a long list of available tags and attributes, which for a new guy who want to create a simple document is a nightmare to find a proper one. Fortunatelly we can set an schema for XSL-FO, so will result in acquire a full intellisense in VS. For a simple *.fo file, we can set the path to the schema directly in file: <?xml version="1.0" encoding="utf-8"?> <fo:root       xmlns:fo="http://www.w3.org/1999/XSL/Format"       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"       xsi:schemaLocation=" http://www.w3.org/1999/XSL/Format http://www.xmlblueprint.com/documents/fop.xsd"> ...   We can of course use the build in VS XML Schemas selector. To use it, we must copy the schema file to the Schemas catalog (defaut path for VS2012 is C:\Program Files (x86)\Microsoft Visual Studio 11.0\Xml\Schemas). Then we can go to Properties of the opened xml/xslt file and set the new added schema to file:                 From now, we should have an enable intellisense as shown below: .

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  • What are the disadvantages of self-encapsulation?

    - by Dave Jarvis
    Background Tony Hoare's billion dollar mistake was the invention of null. Subsequently, a lot of code has become riddled with null pointer exceptions (segfaults) when software developers try to use (dereference) uninitialized variables. In 1989, Wirfs-Brock and Wikerson wrote: Direct references to variables severely limit the ability of programmers to re?ne existing classes. The programming conventions described here structure the use of variables to promote reusable designs. We encourage users of all object-oriented languages to follow these conventions. Additionally, we strongly urge designers of object-oriented languages to consider the effects of unrestricted variable references on reusability. Problem A lot of software, especially in Java, but likely in C# and C++, often uses the following pattern: public class SomeClass { private String someAttribute; public SomeClass() { this.someAttribute = "Some Value"; } public void someMethod() { if( this.someAttribute.equals( "Some Value" ) ) { // do something... } } public void setAttribute( String s ) { this.someAttribute = s; } public String getAttribute() { return this.someAttribute; } } Sometimes a band-aid solution is used by checking for null throughout the code base: public void someMethod() { assert this.someAttribute != null; if( this.someAttribute.equals( "Some Value" ) ) { // do something... } } public void anotherMethod() { assert this.someAttribute != null; if( this.someAttribute.equals( "Some Default Value" ) ) { // do something... } } The band-aid does not always avoid the null pointer problem: a race condition exists. The race condition is mitigated using: public void anotherMethod() { String someAttribute = this.someAttribute; assert someAttribute != null; if( someAttribute.equals( "Some Default Value" ) ) { // do something... } } Yet that requires two statements (assignment to local copy and check for null) every time a class-scoped variable is used to ensure it is valid. Self-Encapsulation Ken Auer's Reusability Through Self-Encapsulation (Pattern Languages of Program Design, Addison Wesley, New York, pp. 505-516, 1994) advocated self-encapsulation combined with lazy initialization. The result, in Java, would resemble: public class SomeClass { private String someAttribute; public SomeClass() { setAttribute( "Some Value" ); } public void someMethod() { if( getAttribute().equals( "Some Value" ) ) { // do something... } } public void setAttribute( String s ) { this.someAttribute = s; } public String getAttribute() { String someAttribute = this.someAttribute; if( someAttribute == null ) { setAttribute( createDefaultValue() ); } return someAttribute; } protected String createDefaultValue() { return "Some Default Value"; } } All duplicate checks for null are superfluous: getAttribute() ensures the value is never null at a single location within the containing class. Efficiency arguments should be fairly moot -- modern compilers and virtual machines can inline the code when possible. As long as variables are never referenced directly, this also allows for proper application of the Open-Closed Principle. Question What are the disadvantages of self-encapsulation, if any? (Ideally, I would like to see references to studies that contrast the robustness of similarly complex systems that use and don't use self-encapsulation, as this strikes me as a fairly straightforward testable hypothesis.)

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  • VMWare tools on Ubuntu Server 10.10 kernel source problem

    - by Hamid Elaosta
    After install and running the vm-ware config, the config needs my kernel headers to compile some modules, ok, so I'll give it them, but it just won't work. It asks for the path of the directory of C header files that match my running kernel. If I uname -r I get 2.6.35-22-generic-pae So I tell it the source path is /lib/modules/2.6.25-22-generic-pae/build/include and it returns "The directory of kernel headers (version @@VMWARE@@ UTS_RELEASE) does not match your running kernel (version 2.6.35-22-generic-pae). ..I'm confused? can anyone offer suggestions please? I installed hte kernel source andh eaders myself using sudo apt-get install linux-headers-$(uname -r)

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  • rsync -c -i flags identical files as different

    - by Scott
    My goal: given a list of files on local server, show any differences to the files with the same absolute path on remote server; e.g. compare local /etc/init.d/apache to same file on remote server. "Difference" for me means different checksum. I don't care about file modification times. I also do not want to sync the files (yet); only show the diffs. I have rsync 3.0.6 on both local and remote servers, which should be able to do what I want. However, it is claiming that local and remote files, even with identical checksums, are still different. Here's the command line: $ rsync --dry-run -avi --checksum --files-from=/home/me/test.txt --rsync-path="cd / && rsync" / me@remote:/ where: "me" = my username; "remote" = remote server hostname current working directory is '/' test.txt contains one line reading "/etc/init.d/apache" OS: Linux 2.6.9 Running cksum on /etc/init.d/apache on both servers yields the same result. The files are the same. However, rsync output is: me@remote's password: building file list ... done .d..t...... etc/ cd+++++++++ etc/init.d/ <f+++++++++ etc/init.d/apache sent 93 bytes received 21 bytes 20.73 bytes/sec total size is 2374 speedup is 20.82 (DRY RUN) The output codes (see http://www.samba.org/ftp/rsync/rsync.html) mean that rsync thinks /etc is identical except for mod time /etc/init.d needs to be changed /etc/init.d/apache will be sent to the remote server I don't understand how, with --checksum option, and the files having identical checksums, that rsync should think they're different. (I've tried with other files having identical mod times, and those files are not flagged as different.) I did run this in /, and made sure (AFAIK) that it's run remotely in /, so even relative pathnames will still be correct. I ran rsync with -avvvi for more debug info, but saw nothing remarkable. I'm wondering: is rsync still looking at file mod times, even with --checksum? am I somehow not setting up the path(s) right? what am I doing wrong?

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  • How to build a "traffic AI"?

    - by Lunikon
    A project I am working on right now features a lot of "traffic" in the sense of cars moving along roads, aircraft moving aroun an apron etc. As of now the available paths are precalculated, so nodes are generated automatically for crossings which themselves are interconnected by edges. When a character/agent spawns into the world it starts at some node and finds a path to a target node by means of a simply A* algorithm. The agent follows the path and ultimately reaches its destination. No problem so far. Now I need to enable the agents to avoid collisions and to handle complex traffic situations. Since I'm new to the field of AI I looked up several papers/articles on steering behavior but found them to be too low-level. My problem consists less of the actual collision avoidance (which is rather simple in this case because the agents follow strictly defined paths) but of situations like one agent leaving a dead-end while another one wants to enter exactly the same one. Or two agents meeting at a bottleneck which only allows one agent to pass at a time but both need to pass it (according to the optimal route found before) and they need to find a way to let the other one pass first. So basically the main aspect of the problem would be predicting traffic movement to avoid dead-locks. Difficult to describe, but I guess you get what I mean. Do you have any recommendations for me on where to start looking? Any papers, sample projects or similar things that could get me started? I appreciate your help!

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  • How do I create an encrypted file system inside a file?

    - by darent
    Recently i've found this interesting tutorial: http://flossstuff.wordpress.com/2011/08/07/using-a-file-as-a-storage-device/ It explains how to create an empty file, format it as ext4, and mount it as a device. I'd like to know if it can be created as an encrypted ext4 file system. I've tried using palimpsest (the disk utility found in System menu) to format the already created file system but it doesn't works as it detects the file system being used. If I try to unmount the file system, it won't work neither because it doesn't detect the device (since it's not a real device like a hardrive or a usb drive). So my question is, is there an option to create the file system encrypted from the begining? I've used these commands: Create an empty file 200Mb size: dd if=/dev/zero of=/path/to/file bs=1M count=200 Make it ext4: mkfs -t ext4 file Mount it in a folder inside my home: sudo mount -o loop file /path/to/mount_point Is there any way the mkfs command creates the ext4 encrypted asking for a decryption password? I'm planing to use this as a way to encrypt files inside Dropbox. Thanks for your time.

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  • Effortlessly resize images in Orchard 1.7

    - by Bertrand Le Roy
    I’ve written several times about image resizing in .NET, but never in the context of Orchard. With the imminent release of Orchard 1.7, it’s time to correct this. The new version comes with an extensible media pipeline that enables you to define complex image processing workflows that can automatically resize, change formats or apply watermarks. This is not the subject of this post however. What I want to show here is one of the underlying APIs that enable that feature, and that comes in the form of a new shape. Once you have enabled the media processing feature, a new ResizeMediaUrl shape becomes available from your views. All you have to do is feed it a virtual path and size (and, if you need to override defaults, a few other optional parameters), and it will do all the work for you of creating a unique URL for the resized image, and write that image to disk the first time the shape is rendered: <img src="@Display.ResizeMediaUrl(Path: img, Width: 59)"/> Notice how I only specified a maximum width. The height could of course be specified, but in this case will be automatically determined so that the aspect ratio is preserved. The second time the shape is rendered, the shape will notice that the resized file already exists on disk, and it will serve that directly, so caching is handled automatically and the image can be served almost as fast as the original static one, because it is also a static image. Only the URL generation and checking for the file existence takes time. Here is what the generated thumbnails look like on disk: In the case of those product images, the product page will download 12kB worth of images instead of 1.87MB. The full size images will only be downloaded as needed, if the user clicks on one of the thumbnails to get the full-scale. This is an extremely useful tool to use in your themes to easily render images of the exact right size and thus limit your bandwidth consumption. Mobile users will thank you for that.

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  • MySQL - Configuration

    - by Stuart Brierley
    Having previously detailed how to install MySQL Server, the next step is configuring MySQL. The MySQL configuration wizard can either be run immediately following installation from the MySQL installation wizard or manually from the Start Menu. Following the splash screen you can then choose whether to run a detailed or standard configuration. The detailed configuration allows you to create the optimal configuration for your specific machine, whereas the standard configuration creates a general configuration that can then be manually tuned. I chose detailed.   You are then asked to choose the type of server instance that is being configured. In this case it is a developer machine. Following this you are asked to choose the type of database usage that you expect on the server. I opted for multifunctional. You must then specify the location of the InnoDB tablespace.   Next specify the number of concurent connections to the server.   Now you must configure the networking options. I left the Strict mode enabled as this is the recommended option, but I disabled TCP/IP networking as I wanted to restrict this MySQL installation to the local machine only.   Set the character set that is best suited to your use - for me this was the default standard character set. Next up is the option to run MySQL as a service and whether or not to include the mysql dircetories in the windows PATH. I kept the install as a windows service option enabled, but unchecked the Launch MySQL server automatically option. This is because I only wanted MySQL running when I specifically want to use it. I also enabled the include in windows PATH option.   You can then change the security settings for the mysql installation. I opted to change the root password, disable root from local machines and disable annoymous access.   You are now ready to execute the configuration.   Once completed you should hopefully see the completed screen with lots of nice ticks against the various configuration tasks.

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