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• Does pressing Back always cause Activity to finish()?

  - by stormin986

  I've heard that pressing the back button will essentially cause the current Activity to finish(). Is this always the case? Seems like it would be with the way it pops the Activity off the stack. The one situation I'm not so sure about is when the root Activity in a Task has back pressed. I'm currently experiencing a very weird effect, described as follows: On loading my application, the first Activity is for initialization, and once it finishes, it calls my main Activity (a TabActivity). This first init activity has android:noHistory="true" set in the Manifest so pressing Back from my main Activity won't go back to that. It goes to the Launcher. When I click on my App in the Launcher a second time, the initialization activity loads again, and loads the main Activity when done. Almost immediately after, it loads a second instance of my main Activity. But ONLY after the Application has already been run once, and was exited by pressing BACK from the main Activity. It does it every subsequent time until I force quit the app or load a new version from the IDE. Based on this, I am suspecting some kind of Activity instance is lying around and being reused, since it only happens on the second+ time I run the application (and exit with BACK -- using HOME just returns to the last state of the app, no big deal). Anyone have any thoughts??

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• OO Objective-C design with XML parsing

  - by brainfsck

  Hi, I need to parse an XML record that represents a QuizQuestion. The "type" attribute tells the type of question. I then need to create an appropriate subclass of QuizQuestion based on the question type. The following code works ([auto]release statements omitted for clarity): QuizQuestion *question = [[QuizQuestion alloc] initWithXMLString:xml]; if( [ [question type] isEqualToString:@"multipleChoiceQuestion"] ) { [myQuestions addObject:[[MultipleChoiceQuizQuestion alloc] initWithXMLString:xml]; } //QuizQuestion.m -(id)initWithXMLString:(NSString*)xml { self.type = ...// parse "type" attribute from xml // parse the rest of the xml } //MultipleChoiceQuizQuestion.m -(id)initWithXMLString:(NSString*)xml { if( self= [super initWithXMLString:xml] ) { // multiple-choice stuff } } Of course, this means that the XML is parsed twice: once to find out the type of QuizQuestion, and once when the appropriate QuizQuestion is initialized. To prevent parsing the XML twice, I tried the following approach: // MultipleChoiceQuizQuestion.m -(id)initWithQuizRecord:(QuizQuestion*)record { self=record; // record has already parsed the "type" and other parameters // multiple-choice stuff } However, this fails due to the "self=record" assignment; whenever the MultipleChoiceQuizQuestion tries to call an instance-method, it tries to call the method on the QuizQuestion class instead. Can someone tell me the correct approach for parsing XML into the appropriate subclass when the parent class needs to be initialized to know which subclass is appropriate?

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• Why Standards Place Limits on Data Transfer Rates?

  - by Mehrdad

  This is a rather general question about hardware and standards in general: Why do they place limits on data transfer rates, and disallow manufacturers from exceeding those rates? (E.g. 100 Mbit/s for Wireless G, 150 Mbit/s for Wireless N, ...) Why not allow for some sort of handshake protocol, whereby the devices being connected agree upon the maximum throughput that they each support, and use that value instead? Why does there have to be a hard-coded limit, which would require a new standard for every single improvement to a data rate?

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• Microsoft Outlook tips and tricks for improving user experience?

  - by Roee Adler

  I'm one of those heavy Microsoft Outlook users, currently working on the 2007 version. God knows this tool is heavy and may impose problems. I wondered what the Super User crowd has to suggest in order to improve the usage experience. Several suggestions of my own: Always work in cached mode (Tools--Account Settings--Change--Use Cached Exchange Mode) Use Outlook's local archiving capabilities Use Outlook's RSS reader - it's simple and allows offline access to your feeds If you have e-mail subscriptions to magazines, blogs, etc. - create a subdirectory to keep them, and a rule to automatically move them there when they arrive (one rule per subscription, based on the sender e-mail.) You can also share suggestions that require configuration of Exchange Server, for those of us who can make bring them to their IT managers. What are your suggestions? PS: "Use Gmail" is not an accepted answer, some of us don't control what email system we use...

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• Distributing a bundle of files across an extranet

  - by John Zwinck

  I want to be able to distribute bundles of files, about 500 MB per bundle, to all machines on a corporate "extranet" (which is basically a few LANs connected using various private mechanisms, including leased lines and VPN). The total number of hosts is roughly 100, and the goal is to get a copy of the bundle from one host onto all the other hosts reliably, quickly, and efficiently. One important issue is that some hosts are grouped together on single fast LANs in which case the network I/O should be done once from one group to the next and then within each group between all the peers. This is as opposed to a strict central server system where multiple hosts might each fetch the same bundle over a slow link, rather than once via the slow link and then between each other quickly. A new bundle will be produced every few days, and occasionally old bundles will be deleted (but that problem can be solved separately). The machines in question happen to run recent Linuxes, but bonus points will go to solutions which are at least somewhat cross-platform (in which case the bundle might differ per platform but maybe the same mechanism can be used). That's pretty much it. I'm not opposed to writing some code to handle this, but it would be preferable if it were one of bash, Python, Ruby, Lua, C, or C++.

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• Experience with MQ File Transfer Edition?

  - by mfinni

  We've got several processes that move files across servers - SFTP, FTP, SCP; Windows, Linux, AIX; there is a workflow component (usually require a control file with filenames and hash values to move a batch of related files). The action is often initiated on our servers to get the files, so we need to make sure they're done being written. We have some homegrown scripts to do this, but they don't always work properly, and troubleshooting, maintenance, and log review is not easy this way. There's a lot of servers, and our scripts don't have central logging or a dashboard/console/etc. We're looking into commercial products to do this. Has anyone used MQ File Transfer Edition? Another team in our company is using Aspera, does anyone have any thoughts on that, or other favored products? I have no idea what our budget is for this, yet. Just trying to get a handle on the product space from the perspective of other admins.

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• Asus z53 laptop overheating problem

  - by Tiberiu Hajas

  hi all, wondering if anyone encountered overheating of asus laptop ? especially the z53 model ? usually the right side of the laptop and vent in the upper corner is blowing hot air when under even minimal load, the CPU temperature can easily get to 65-70C and GPU is even above 80C. I'm using NHC (notebook health control) to set to a higher conservatory power consumption but that helps only a bit, anyone opened up the case ? wondering is require a dust clean ...etc ? I still have some warranty on it. thanks

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• Variable amount of columns returned in mysqli prepared statement

  - by manyxcxi

  I have a situation where a dynamic query is being generated that could select anywhere from 1 to over 300 different columns across multiple tables. It currently works fine just doing a query, however the issue I'm running into in using a prepared statement is that I do not know how to handle the fact that I don't know how many columns I will be asking for each time and therefor don't know how to process the results. The reason I believe a bind statement will help is because once this query is run once, it will most likely (though not always) be run again with the exact same parameters. Currently I have something like this: $rows = array(); $this->statement = $this->db->prepare($query); $this->statement->bind_param('i',$id); $this->statement->execute(); $this->statement->bind_result($result); while($this->statement->fetch()) { $rows[] = $result; } I know this doesn't work as I want it to, my question is how do I get the data back out of the query. Is it possible to bring the columns back in an associative array by column name, like a standard mysqli query?

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• Python Twisted Client Connection Lost

  - by MovieYoda

  I have this twisted client, which connects with a twisted server having an index. I ran this client from command-line. It worked fine. Now I modified it to run in loop (see main()) so that I can keep querying. But the client runs only once. Next time it simply says connection lost \n Connection lost - goodbye!. What am i doing wrong? In the loop I am reconnecting to the server, it that wrong? from twisted.internet import reactor from twisted.internet import protocol from settings import AS_SERVER_HOST, AS_SERVER_PORT # a client protocol class Spell_client(protocol.Protocol): """Once connected, send a message, then print the result.""" def connectionMade(self): self.transport.write(self.factory.query) def dataReceived(self, data): "As soon as any data is received, write it back." if data == '!': self.factory.results = '' else: self.factory.results = data self.transport.loseConnection() def connectionLost(self, reason): print "\tconnection lost" class Spell_Factory(protocol.ClientFactory): protocol = Spell_client def __init__(self, query): self.query = query self.results = '' def clientConnectionFailed(self, connector, reason): print "\tConnection failed - goodbye!" reactor.stop() def clientConnectionLost(self, connector, reason): print "\tConnection lost - goodbye!" reactor.stop() # this connects the protocol to a server runing on port 8090 def main(): print 'Connecting to %s:%d' % (AS_SERVER_HOST, AS_SERVER_PORT) while True: print query = raw_input("Query:") if query == '': return f = Spell_Factory(query) reactor.connectTCP(AS_SERVER_HOST, AS_SERVER_PORT, f) reactor.run() print f.results return if __name__ == '__main__': main()

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• MySQL Windows vs. Linux: performance, caveats, pros and cons?

  - by gravyface

  Looking for (preferrably) some hard data or at least some experienced anecdotal responses with regards to hosting a MySQL database (roughly 5k transactions a day, 60-70% more reads than writes, < 100k of data per transaction i.e. no large binary objects like images, etc.) on Windows 2003/2008 vs. a Debian-based derivative (Ubuntu/Debian, etc.). This server will function only as a database server with a separate Web server on another physical box; this server will require remote access for management (SSH for Linux, RDP for Windows). I suspect that the Linux kernel/OS will compete less than the Windows Server for resources, but for this I can't be certain. There's also security footprint: even with Windows 2008, I'm thinking that the Linux box can be locked down more easily than the Windows Server. Anyone have any experience with both configurations?

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• yum list installed including version of all installed packages CentOS 5.4

  - by Andy

  I have a list of packages installed with yum on CentOS 5.4 [root@server ~]# yum list installed ... Installed Packages GConf2.x86_64 2.14.0-9.el5 installed ImageMagick.x86_64 6.2.8.0-4.el5_1.1 installed MAKEDEV.x86_64 3.23-1.2 installed MySQL-python.x86_64 1.2.1-1 installed I would like to download these rpms locally using yumdownloader --resolve MySQL-python-1.2.1-1.x86_64 etc. However the package formatting is different (MySQL-python.x86_64 1.2.1-1 vs MySQL-python-1.2.1-1.x86_64) so I am unable to download them using the above command. I don't want to have to parse the output of yum list installed, and I also don't want to use the contents of /var/log/yum.log* as I'll have to account for erased packages and version discrepancies. However /var/log/yum.log* does have the formatting I require... May 25 14:58:15 Installed: groff-1.18.1.1-11.1.x86_64 May 25 14:58:15 Installed: bzip2-1.0.3-4.el5_2.x86_64 Any suggestions?

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• How can I visualise a "broken" hierarchical dataset?

  I have a reasonably large datatable structured something like this: StaffNo Grade Direct Boss2 Boss3 Boss4 Boss5 Boss6 ------- ----- ----- ----- ----- ----- ----- ----- 10001 1 10002 10002 10057 10094 10043 10099 10002 2 10057 NULL 10057 10094 10043 10099 10003 1 10004 10004 10057 10094 10043 10099 10004 2 10057 NULL 10057 10094 10043 10099 10057 3 10094 NULL NULL 10094 10043 10099 etc.... i.e. a unique id , their level (grade) in the hierarchy, a record of their bosses ID and the IDs of the supervisors above. (The 2,3,4, etc refers to the boss at that particular grade). The system relies on a strict hierarchy - if you are my boss (/parent) then your boss must be my grandparent. Unfortunately this rule is not enforced within the data model and the data ultimately comes from other systems which don't even know about the rule, let alone observe it. So you and I may share the same boss, but our bosses boss won't be the same. note: I cannot change the data model I cannot fix the data at source. So (for the moment) I have to fix the data once it's in place. Once a fortnight someone will do something which breaks the model and I'll need to modify the procs slightly to resolve. Not ideal, but I'm stuck with this for the next six months. Anyway, specific queries are easy to produce but I find it hard to keep track of the bigger picutre. The application which sits on this runs without complaint regardless but navigating around the system becoming extraordinarily confusing. So my question is: Can anyone recommend a tool (or technique) for generating some kind of "broken tree" diagram in this sort of circumstances? I don't want something that will fix things for me, or attempt statistical analysis but at least something that will give a visual indication of how broken it is at any one time. Note : At the moment this is in a SQL Server database but I'm open to ideas utilising C#, Perl or Python.

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• Options for remote desktop software for helping remote users?

  - by Nick G

  I need an easy way to jump on someone elses machine to help them solve a problem. It needs to be really easy for them to install (preferably doesn't actually require an "install" but just running an exe?). It must punch through any firewalls automatically using a relay server or P2P (so Remote Desktop itself is no use to me). I've found commercial products like MeetMeNow but they're really expensive. I want something that you can either buy a cheap pack of sessions or minutes, or preferably something free. I'm not in the business of commerical support and would only use it once every couple of months perhaps.

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• Recommend an SFTP solution for Windows (Server & Client) that integrates well with Dreamweaver

  - by aaandre

  Could you please recommend a secure FTP solution for updating files on a remote windows server from windows workstations? We would like to replace the FTP-based workflow with a secure FTP one. Windows Server 2003 on the remotely hosted webserver, WinXP on the workstations. We manage the files via Dreamweaver's built-in FTP. My understanding is Dreamweaver supports sFTP out of the box so I guess I am looking for a good sFTP server for Windows Server 2003. Ideally, that would not require cygwin. Ideally, the solution would use authentication based on the existing windows accounts and permissions. Thank you!

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• Subversion LDAP Configuration

  - by dbyrne

  I am configuring a subversion repository to use basic LDAP authentication. I have an entry in my http.conf file that looks like this: <Location /company/some/location> DAV svn SVNPath /repository/some/location AuthType Basic AuthName LDAP AuthBasicProvider ldap Require valid-user AuthLDAPBindDN "cn=SubversionAdmin,ou=admins,o=company.com" AuthLDAPBindPassword "XXXXXXX" AuthLDAPURL "ldap://company.com/ou=people,o=company.com?personid" </Location> This works fine for living, breathing people who need to log in. However, I also need to provide application accounts access to the repository. These accounts are in a different OU. Do I need to add a whole new <location> element, or can I add a second AuthLDAPURLto the existing entry?

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• Permanently override background colour of Emacs theme

  - by John J. Camilleri

  I want to use the Emacs theme billw, except with a different background colour. I have the following in my .emacs file: (require 'color-theme) (color-theme-initialize) (color-theme-billw) (set-background-color "gray12") However this doesn't seem to change the background colour on startup; I need to manually run set-background-color "gray12" in the minibuffer at the beginning of each session. Any help with this? I tried creating my own custom theme based on the output of color-theme-print but this caused more problems than it's worth...

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• Appropriate Network switch for small server cluster

  - by Chris Dutrow

  Need to build a small business server cluster for the purpose of crunching data. It will not host a web site that needs to be available 24/7. It does need to support servers that host Redis, a Cassandra database cluster, and a Python web server. Operating system will most likely be Centos 6.4 Other servers in the cluster should be able to communicate very fast with each other, especially the Redis server. This will probably require the use of internal IP addresses. We will need to use multi-data center replication to synchronize the Cassandra cluster with the one that we currently have hosted on the cloud Was looking into network switches and we are unsure of the appropriate specifications that we should be looking for. Does the switch need to be "managed" or can it be "unmanged"? Does the switch need to support IPv6 or just IPv4? Do we need an enterprise level Cisco switch, or can we go with something like a $200 DLink managed (or unmanaged) small business switch? Thanks so much!

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• Share one monitor with another user and display their screen as well

  - by Xiong Chiamiov

  My housemate and I just started playing the original RollerCoaster Tycoon again - what a nostalgia trip! Anyways, we both have two monitors, and would like to view the other's game on the secondary monitor while playing, since we're in different rooms. VNC-like applications sorta work, but they require two separate instances running (one to share each direction), and as a whole are rather slow and clumsy. We don't need any remote control at all, just viewing. I'm using XP, he Win7. We could probably get it to run through some means in Linux, if necessary.

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• subversion: enforce TLS

  - by Daniel Marschall

  Hello, I am running subversion on a Debian Squeeze system with Apache2 and mod_dav for viewing the contents with a webbrowser. I want to enforce the usage of TLS, so that the login data and the SVN contents cannot be read from the connection. I have tried following: <Location /svn> DAV svn SVNParentPath /daten/subversion/ # our access control policy AuthzSVNAccessFile /daten/subversion/access_control # try anonymous access first, resort to real # authentication if necessary. Satisfy Any Require valid-user # how to authenticate a user AuthType Basic AuthName "Subversion repository" AuthUserFile /daten/subversion/.htpasswd # Test SSLRequireSSL RewriteEngine On RewriteCond %{SERVER_PORT} !443 RewriteRule ^svn/(.)$ https://www.viathinksoft.de/svn/$1 [R,L] </Location> at file /etc/apache2/conf.d/subversion.conf Alas, this does not work. There is no redirect and there is still a HTTP request working at /svn/(projectname)/(somefolder) . This SSL-enforce-policy should work for - viewing the contents with webbrowser - retrieve contents with TurtoiseSVN client - committing contents with TurtoiseSVN client Can you please help me? Regards Daniel Marschall

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• Using forward declarations for build in datatypes.

  - by bdhar

  I understand that wherever possible we shall use forward declarations instead of includes to speed up the compilation. I have a class Person like this. #pragma once #include <string> class Person { public: Person(std::string name, int age); std::string GetName(void) const; int GetAge(void) const; private: std::string _name; int _age; }; and a class Student like this #pragma once #include <string> class Person; class Student { public: Student(std::string name, int age, int level = 0); Student(const Person& person); std::string GetName(void) const; int GetAge(void) const; int GetLevel(void) const; private: std::string _name; int _age; int _level; }; In Student.h, I have a forward declaration class Person; to use Person in my conversion constructor. Fine. But I have done #include <string> to avoid compilation error while using std::string in the code. How to use forward declaration here to avoid the compilation error? Is it possible? Thanks.

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• fullCalendar: Implementing a custom event fetcher using event as function

  - by Nick-ACNB

  If I specify a json feed, the events are re-fetched everytime and the fetching time shows the item appearing which causes a delay which is undesirable (at least after initial fetch was done). I am using the latest version from gitHub 1.4.6. The lazyFetching property seems to only work when you change views and you previously fetched for example a month and are drilling down to week/day which is unusable since I only use agendaDay. Here is what I am trying to achieve: $("#calendar").fullCalendar({ events: function(start, end, callback) { $.getJSON( "/GetEvents", { start: start.valueOf() }, function(data, textStatus) { $.each(data, function(i, event) { //Goal here is to only add items that aren't already rendered. if ($("#calendar") .fullCalendar('clientEvents', event.id)=="") $("#calendar").fullCalendar('renderEvent', event, true); }); } ); }); The goal is to use the sticky property in the renderEvent method so that on-screen they aren't re-rendered if they we're previously fetched. I omitted a part where I manually delete those that we're deleted and modify those that we're updated since I am in multi-user settings but you get the point. My issue is that they are fetched once and added. But once I change day and come back, they don't render even if I used sticky... has anyone gotten this error or did I code anything wrong? Also, is this a wrong way to go? I will consider any input. :) Thank you very much.

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• What emulator / VM software can I use to create a Win32-portable Linux Guest?

  - by Jotham

  Hi, I want to create a portable VM setup so that I can boot a Linux install regardless of which Windows XP / Windows 7 host machine I am on. I was looking at Qemu but it doesn't appear to have a relatively safe win32 build. Other things like VirtualBox require complete install on the host OS for performance reasons. I'm not so concerned about performance, I just want to run a few curses based applications. My ideal end goal would be a a memory stick of some size with a VM/Emulator I can boot on most WinXP/Windows 7 machines and access my own curses based applications (probably archlinux or debian). Any help would be appreciated. Regards,

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• Download folders from dev server to local drive

  - by Niall Collins

  I am developing a .net web application on a local environment. I have a dev server that the application is installed on. Within the web application on the dev server I have four folders that I dont have locally and that are controlled by another application. In my day to day development I require the four folders on local PC. I would like to automate the process of pulling the folders from the dev server to my local drive, so I can keep thing in sync. Ideally something like this Run file from main folder (be it a bat file, powershell, some sort of job, open to recommendations) Download 4 folders supplied to it. First download bring everything down, from them on only pull the changes Not sure where to start with achieving this but would appreciate any help would with. I know there are apps out there that do something like this but would like to give a go writing something to do this before I resort to using one of them.

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• jQuery .html not writing span on page load, rights the span on ajax response

  - by pedalpete

  I've got a bit of a calendar I'm building with events that go beyond the boundary of one day. I've got a graph which shows how many events are running concurrently. In order to graph out the events which go into another day, I look for hours24, and run an extra bit of code. jQuery('li#hour'+placeGroup+'_'+schedDay2+'_'+thisHour,nextDay).data('count', numStaff).html(''+printHour+''+numEvents+' scheduled').css('height',numEvents*5+'px'); The code is working, the li items are being found, proper height is the css is being applied, data is set, which I've checked by running alert(jQuery('li#hour'+placeGroup+'_'+schedDay2+'_'+thisHour,nextDay).data('count')); right after the pervious bit of code. The only thing that isn't being done is the .html(add span) stuff. I run this code in two places. Once when the page loads, and once when an action is taken which changes the number of events via an ajax response. The li DOM object I'm writting to is created before the script is run, and the height is being applied, but not the span, and only on page load. Any ideas on this one? I'm stumped.

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• Recommending simple appliance for DansGuardian, iptables, snort inline

  - by SRobertJames

  I'm currently using a Linksys E2000 with dd-wrt. I'd like to add DansGuardian for Content Filtering and snort-inline for IPS; but those require a more powerful box (mainly, more storage). Can you recommend a good device to use? I'm open to both overwrite-the-firmware (like dd-wrt) and designed-to-be-customized boxes. Requirements: 1. 5+ Ethernet ports, pref. GigE 2. small form factor 3. No noise (office environment) 4. low power 5. Not sure about 802.11 wireless Budget < $400, pref. less.

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