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• Best ways to teach a beginner to program?

  - by Justin Standard

  Original Question I am currently engaged in teaching my brother to program. He is a total beginner, but very smart. (And he actually wants to learn). I've noticed that some of our sessions have gotten bogged down in minor details, and I don't feel I've been very organized. (But the answers to this post have helped a lot.) What can I do better to teach him effectively? Is there a logical order that I can use to run through concept by concept? Are there complexities I should avoid till later? The language we are working with is Python, but advice in any language is welcome. How to Help If you have good ones please add the following in your answer: Beginner Exercises and Project Ideas Resources for teaching beginners Screencasts / blog posts / free e-books Print books that are good for beginners Please describe the resource with a link to it so I can take a look. I want everyone to know that I have definitely been using some of these ideas. Your submissions will be aggregated in this post. Online Resources for teaching beginners: A Gentle Introduction to Programming Using Python How to Think Like a Computer Scientist Alice: a 3d program for beginners Scratch (A system to develop programming skills) How To Design Programs Structure and Interpretation of Computer Programs Learn To Program Robert Read's How To Be a Programmer Microsoft XNA Spawning the Next Generation of Hackers COMP1917 Higher Computing lectures by Richard Buckland (requires iTunes) Dive into Python Python Wikibook Project Euler - sample problems (mostly mathematical) pygame - an easy python library for creating games Create Your Own Games With Python ebook Foundations of Programming for a next step beyond basics. Squeak by Example Recommended Print Books for teaching beginners Accelerated C++ Python Programming for the Absolute Beginner Code by Charles Petzold

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• Disable cache in Silverlight HttpWebRequest

  - by synergetic

  My Silverlight4 app is hosted in ASP.NET MVC 2 web application. I do web request through HttpWebRequest class but it gives back a result previously cached. How to disable this caching behavior? There are some links which talks about HttpWebRequest in .NET but Silverlight HttpWebrequest is different. Someone suggested to add unique dummy query string on every web request, but I'd prefer more elegant solution. I also tried the following, but it didn't work: _myHttpWebRequest.BeginGetRequestStream(new AsyncCallback(BeginRequest), new Guid()); In fact, by setting browser history settings it is possible to disable caching. See the following link: http://stackoverflow.com/questions/3027145/asp-net-mvc-with-sql-server-backend-returns-old-data-when-query-is-executed But asking a user to change browser settings is not an option for me.

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• Is there a perfect algorithm for chess?

  - by Overflown

  Dear Stack Overflow community, I was recently in a discussion with a non-coder person on the possibilities of chess computers. I'm not well versed in theory, but think I know enough. I argued that there could not exist a deterministic Turing machine that always won or stalemated at chess. I think that, even if you search the entire space of all combinations of player1/2 moves, the single move that the computer decides upon at each step is based on a heuristic. Being based on a heuristic, it does not necessarily beat ALL of the moves that the opponent could do. My friend thought, to the contrary, that a computer would always win or tie if it never made a "mistake" move (however do you define that?). However, being a programmer who has taken CS, I know that even your good choices - given a wise opponent - can force you to make "mistake" moves in the end. Even if you know everything, your next move is greedy in matching a heuristic. Most chess computers try to match a possible end game to the game in progress, which is essentially a dynamic programming traceback. Again, the endgame in question is avoidable though. -- thanks, Allan Edit: Hmm... looks like I ruffled some feathers here. That's good. Thinking about it again, it seems like there is no theoretical problem with solving a finite game like chess. I would argue that chess is a bit more complicated than checkers in that a win is not necessarily by numerical exhaustion of pieces, but by a mate. My original assertion is probably wrong, but then again I think I've pointed out something that is not yet satisfactorily proven (formally). I guess my thought experiment was that whenever a branch in the tree is taken, then the algorithm (or memorized paths) must find a path to a mate (without getting mated) for any possible branch on the opponent moves. After the discussion, I will buy that given more memory than we can possibly dream of, all these paths could be found.

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• How to update Child grid in asp.net using LINQ

  - by Raj Kumar

  Hi I have an asp.net page where i am using LINQdatasource to bind grid. Now whenever, if some one changes something in grid I want to update a history table. which is also shown as child grid for each row Let say I have a grid with two column Name and Age. it also has a child row with column field and datetime. so when ever if some one changes something in Name or Age column and saves it. A new row is inserted in child row with the name of field changed and date time when it was changed

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• dcommit to SVN in 1 commit after cherry-picking in git

  - by DJ

  I would like to know if there is a clean way to do git-svn dcommit of multiple local commits as 1 commit into subversion. The situation that I have is I am cherry picking some bug fixes changes from our trunk into the maintenance branch. The project preference is to have the bug fixes to be committed as 1 commit in subversion, but I would like to keep the history of changes that I had cherry-picked on my local git for references. Currently what I do is to do all cherry-picking on branch X and then do a squash merge into new branch Y. The dcommit will then be done from branch Y. Is there a better way to do it without using an intermediary branch?

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• Ruby on rails generates tests for you. Do those give a false sense of a safety net?

  - by Hamish Grubijan

  Disclaimer: I have not used RoR, and I have not generated tests. But, I will still dare to post this question. Quality Assurance is theoretically impossible to get 100% right in general (Undecidable problem ;), and it is hard in practice. So many developers do not understand that writing good automated tests is an art, and it is hard. When I hear that RoR generates the tests for you, I get very skeptical. It cannot be that easy. Testing is a general concept; it applies across languages. So does the concept of code contracts, it is similar for languages that support it. Code contracts do not generate themselves. The programmer must add the requirements and the promises manually, after doing some thinking about the algorithm / function. If a human gets it wrong, then the tools will propagate the error. Similarly with testing - it takes human judgement about what should happen. Tests do not write themselves, and we are far from the day when a business analyst can just have a conversation with a computer and tell it informally what the requirements are and have the computer do all the work. There is no magic ... how can RoR generate good tests for you? Please shed some light on this. Opinions are ok, for this is a community wiki. Thanks!

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• Extending Perforce to use a custom content diff tool for certain file extensions

  - by Fraser Graham

  I have various custom binary files stored in perforce and for many of the file types I have built a custom diff tool to show the content creators a diff of the actual changes to the file. E.g. If the file holds simple key value pairs as a compressed binary blob the diff tool would load each version into an in memory format and generate a list of additions, deletions and edits to the file presented in a nice clean report view. Much like the built in image diff tool in P4V i'd like to be able to use my own diff tool for certain file extensions within my depot and allow the users to use the existing P4V interface to pick revisions to diff between and examine history. So, I am aware you can write add-ins to P4V but I can't find any documentation on it and I'd like to know if this kind of extension functionality is available in P4V and how to use it?

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• Starter question of declarative style SQLAlchemy relation()

  - by jfding

  I am quite new to SQLAlchemy, or even database programming, maybe my question is too simple. Now I have two class/table: class User(Base): __tablename__ = 'users' id = Column(Integer, primary_key=True) name = Column(String(40)) ... class Computer(Base): __tablename__ = 'comps' id = Column(Integer, primary_key=True) buyer_id = Column(None, ForeignKey('users.id')) user_id = Column(None, ForeignKey('users.id')) buyer = relation(User, backref=backref('buys', order_by=id)) user = relation(User, backref=backref('usings', order_by=id)) Of course, it cannot run. This is the backtrace: File "/Library/Python/2.6/site-packages/SQLAlchemy-0.5.8-py2.6.egg/sqlalchemy/orm/state.py", line 71, in initialize_instance fn(self, instance, args, kwargs) File "/Library/Python/2.6/site-packages/SQLAlchemy-0.5.8-py2.6.egg/sqlalchemy/orm/mapper.py", line 1829, in _event_on_init instrumenting_mapper.compile() File "/Library/Python/2.6/site-packages/SQLAlchemy-0.5.8-py2.6.egg/sqlalchemy/orm/mapper.py", line 687, in compile mapper._post_configure_properties() File "/Library/Python/2.6/site-packages/SQLAlchemy-0.5.8-py2.6.egg/sqlalchemy/orm/mapper.py", line 716, in _post_configure_properties prop.init() File "/Library/Python/2.6/site-packages/SQLAlchemy-0.5.8-py2.6.egg/sqlalchemy/orm/interfaces.py", line 408, in init self.do_init() File "/Library/Python/2.6/site-packages/SQLAlchemy-0.5.8-py2.6.egg/sqlalchemy/orm/properties.py", line 716, in do_init self._determine_joins() File "/Library/Python/2.6/site-packages/SQLAlchemy-0.5.8-py2.6.egg/sqlalchemy/orm/properties.py", line 806, in _determine_joins "many-to-many relation, 'secondaryjoin' is needed as well." % (self)) sqlalchemy.exc.ArgumentError: Could not determine join condition between parent/child tables on relation Package.maintainer. Specify a 'primaryjoin' expression. If this is a many-to-many relation, 'secondaryjoin' is needed as well. There's two foreign keys in class Computer, so the relation() callings cannot determine which one should be used. I think I must use extra arguments to specify it, right? And howto? Thanks

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• chat application: pubsubhubbub vs xmpp

  - by sofia

  I'm unsure on the best stack to build a chat application. Currently I'm thinking of two main options: facebook tornado cons: does not use the main chat protocol xmpp but pubsubhubbub pros: i really like its simplicity for development (webserver + webframework); pubsubhubbub also seems simpler as a protocol than xmpp; and i know python xmpp + bosch, punjab, ejabberd cons: don't know erlang; overall seems a bit harder to develop pros: uses xmpp protocol The chat app will need to have the following: Private messages Public rooms Private rooms Chat history for rooms (not forever, just the last n messages) html embedding url to chat room Both options seem scalable so that's not really my worry (we're thinking of running the app in amazon's ec2 as well). I know there's a project that builds a xmpp server using tornado but it's not ready for production use and our deadline isn't that big. Basically my main worry is ease of development vs somehow regretting later using pubsubhubbub to develop a chat app but I read somewhere that PubSubHubbub might eventually replace XMPP as REST replaced SOAP - so what do you think?

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• AnkhSVN Commits Are Very Slow

  - by jakdep

  Recently, I had to move my SVN repositories to a different server, but I am experiencing some performance problems since the move. I am using Visual Studio 2005, AnkhSVN 2.1.7819.411 and TortoiseSVN 1.6.6 on my workstation and VisualSVN Server on the server which runs Windows Server 2008. Whenever I try to commit a file or view the file history in Visual Studio it takes twenty odd seconds. I confirmed that an exception has been made for VisualSVN Server on the server's firewall, but when I disable the server's firewall the performance is back to normal (1-2 seconds for a commit). When I do a commit or check the log on a file in TortoiseSVN the performance is fine as well. To ensure that the problem was not related to the moving of the repositories, I am running these tests against a new repository which was created on the new server. So, I reckon the problem lies with AnkhSVN, but am at a loss as how to diagnose it further. Any help would be greatly appreciated.

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• Enterprise distribution Program for iPhone

  - by Mohammed Sadiq

  Hi all, I would like to implement a application which backs up all the internal datas like sms, mms, videos, audios, documents, call history stored in iPhone. But this seems to be not possible with api docs that the apple has released so far ... I have gone through the pdf of ENterprise distribution program and some of the links related to Enterprise Distribution Program, specifies about the Remote wipe and accessing of internal datas like Calendar, sms, mms ect .... But they didnt mention how to do it programmatically. Does Apple provide any special priviledges like extra api support to access the internal data in their Enterprise Distribution Program?. Is there any difference between Enterprise Distribution Program and Standard Distribution Program in the development point of view? And since in-house distribution does not require Apple approval, shall we use some other method which are not officially mentioned in apple docs, to access the internal stored data .. If so can anyone point out the way to do it? Any help would be greatly appreciated awaiting for your response Best regards, Mohammed Sadiq ....

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• jquery script removal

  - by VictorS

  I am working on a page(ASP.NET 3.5) that has alert when "Save" button is pressed, i.e.this in page code behind: Page.ClientScript.RegisterStartupScript(this.GetType(), "alertMsg", "alert('" + Message + "');", true); So when I look at the page after sucessful save I see a script tag added: <script type="text/javascript"> //<![CDATA[ alert('Save Sucessful.'); </script> The problem is that there is another button that redirects to another page and on that page there is a button to jump back to this page, i.e. javascript:history.go(-1); So if you save then go to another page and come back you see alert again. Unless there is a better way of handling this situation, I think I need to remove that script when I redirect from the page, can I do it with jQuery, i.e. on redirect button click remove above script from the page?

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• python urllib post question

  - by paul

  hello ALL im making some simple python post script but it not working well. there is 2 part to have to login. first login is using 'http://mybuddy.buddybuddy.co.kr/userinfo/UserInfo.asp' this one. and second login is using 'http://user.buddybuddy.co.kr/usercheck/UserCheckPWExec.asp' i can login first login page, but i couldn't login second page website. and return some error 'illegal access' such like . i heard this is related with some cooke but i don't know how to implement to resolve this problem. if anyone can help me much appreciated!! Thanks! import re,sys,os,mechanize,urllib,time import datetime,socket params = urllib.urlencode({'ID':'ph896011', 'PWD':'pk1089' }) rq = mechanize.Request("http://mybuddy.buddybuddy.co.kr/userinfo/UserInfo.asp", params) rs = mechanize.urlopen(rq) data = rs.read() logged_fail = r';history.back();</script>' in data if not logged_fail: print 'login success' try: params = urllib.urlencode({'PASSWORD':'pk1089'}) rq = mechanize.Request("http://user.buddybuddy.co.kr/usercheck/UserCheckPWExec.asp", params ) rs = mechanize.urlopen(rq) data = rs.read() print data except: print 'error'

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• c# Unit Test: Writing to Settings in unit test does not save values in user.config

  - by HorstWalter

  I am running a c# unit test (VS 2008). Within the test I do write to the settings, which should result in saving the data to the user.config. Settings.Default.X = "History"; // X is string Settings.Default.Save(); But this simply does not create the file (I have crosschecked under "C:\Documents and Settings\HW\Local Settings\Application Data"). If I create the same stuff as a Console application, there is no problem persisting the data (same code). Is there something special I need to consider doing this in a UnitTest?

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• Any way to view dynamic java content ex-post? Browser session still open

  - by Ryan

  I feel like a grandpa from 1996 asking this, but is it at all possible to view a representation of a particular screen that was rendered as part of a java-based online checkout process I executed a couple days ago? I haven't cleared my browser cache or temp files or anything, and I don't think I've restarted the comp or even the browser since. I'm using mac OS X 10.6.8, and the page(s) were viewed with Chrome version 21.0.1180.89 in standard mode (not incognito). Specifically the page in question was part of Verizon Wireless's 'iconic' contract/checkout process, which leads the user through several pages to make selections on various criteria and seems to be based on java. (Obviously I'm a dummy regarding web stuff so the question is probably not very well defined, I'm happy to elaborate). ^This is the tl;dr question. If it belongs on another site please just let me know. This is what I've been able to figure out on my own, for the bored / ultra-helpful / those who could use a laugh at a noob fumbling his way around cache files with no idea what he's doing: The progress through the selection pages is very clear in Chrome's browser history, the sequential pages are: https://www.verizonwireless.com/b2c/accountholder/estore/phoneupgrade?execution=e3s2 https://www.verizonwireless.com/b2c/accountholder/estore/phoneupgrade?execution=e3s3 https://www.verizonwireless.com/b2c/accountholder/estore/phoneupgrade?execution=e3s4 https://www.verizonwireless.com/b2c/accountholder/estore/phoneupgrade?execution=e3s5 https://preorder.verizonwireless.com/iconic/?format=JSON&value={%22action%22:%22START_ORDER%22,%22custType%22:%22EXISTING%22,%22orderType%22:%22UPGRADE%22,%22lookupMtn%22:%22*(NumberA)*%22,%22lineData%22:[{%22mtn%22:%22*(NumberA)*%22,%22upgType%22:%22ALTERNATE_UPGRADE%22,%22eligibleMtn%22:%22*(NumberB)*%22}]} https://preorder.verizonwireless.com/iconic/iconic/secured/screens/IconicOrder.do?format=JSON&value={%22action%22:%22START_ORDER%22,%22custType%22:%22EXISTING%22,%22orderType%22:%22UPGRADE%22,%22lookupMtn%22:%22*(NumberA)*%22,%22lineData%22:[{%22mtn%22:%22*(NumberA)*%22,%22upgType%22:%22ALTERNATE_UPGRADE%22,%22eligibleMtn%22:%22*(NumberB)*%22}]} https://preorder.verizonwireless.com/iconic/iconic/secured/screens/IconicEligibility.do https://preorder.verizonwireless.com/iconic/iconic/secured/screens/IconicDeviceSelection.do https://preorder.verizonwireless.com/iconic/iconic/secured/screens/PlanOptions.do https://preorder.verizonwireless.com/iconic/iconic/secured/screens/IconicFeatures.do https://preorder.verizonwireless.com/iconic/iconic/secured/screens/IconicAccessories.do https://preorder.verizonwireless.com/iconic/iconic/secured/screens/IconicShipmentBilling.do https://preorder.verizonwireless.com/iconic/iconic/secured/screens/IconicReview.do https://preorder.verizonwireless.com/iconic/iconic/secured/screens/IconicPaymentCreditInfo.do https://preorder.verizonwireless.com/iconic/iconic/secured/screens/IconicConfirmation.do The visual representation I would need could come from any of these pages, as the necessary information was shown at the top of each of them (although the two with long URLs were just like redirects or something). Of course, clicking the link to the page in History right now requires a new sign-in and just returns the user to the initial step for doing the process again; it does not pull up a representation of the page as it was seen several days ago. This I understand. Instead using Chrome's integrated cache viewer by typing about:cache in the address bar, I can search and find links that appear to be relevant, when I click on the link I just get a http header and a bunch of hexadecimal gobbledygook. I've tried to use the URL at the top of the cache and URLs in the http headers, but they take me to current versions of those pages and not the versions I saw during the checkout process. I tried this with a few of them but stopped because I noticed that it updated the date in the http header to the present moment and I don't want to take chances overwriting the cache files since I don't know what I'm doing. The links to the cache files look like this: https://login.verizonwireless.com/amserver/UI/Login?realm=vzw&goto=https%3A%2F%2Fpreorder.verizonwireless.com%3A443%2Ficonic%2Ficonic%2Fsecured%2Fscreens%2FPlanOptions.do https://preorder.verizonwireless.com/iconic/iconic/screens/customerTypeOverlay.jsp https://verizonwireless.tt.omtrdc.net/m2/verizonwireless/mbox/standard?mboxHost=login.verizonwireless.com&mboxSession=1347776884663-145230&mboxPC=1347609748832-956765.19&mboxPage=1347776884663-145230&screenHeight=1200&screenWidth=1920&browserWidth=1299&browserHeight=868&browserTimeOffset=-420&colorDepth=24&mboxCount=1&mbox=My_Verizon_Global&mboxId=0&mboxTime=1347751684666&mboxURL=https%3A%2F%2Flogin.verizonwireless.com%2Famserver%2FUI%2FLogin%3Frealm%3Dvzw%26goto%3Dhttps%253A%252F%252Fpreorder.verizonwireless.com%253A443%252Ficonic%252Ficonic%252Fsecured%252Fscreens%252FPlanOptions.do&mboxReferrer=&mboxVersion=41 and https://verizonwireless.tt.omtrdc.net/m2/verizonwireless/mbox/standard?mboxHost=login.verizonwireless.com&mboxSession=1347735676953-663794&mboxPC=1347609748832-956765.19&mboxPage=1347738347511-550383&screenHeight=1200&screenWidth=1920&browserWidth=1299&browserHeight=845&browserTimeOffset=-420&colorDepth=24&mboxCount=1&mbox=My_Verizon_Global&mboxId=0&mboxTime=1347713147517&mboxURL=https%3A%2F%2Flogin.verizonwireless.com%2Famserver%2FUI%2FLogin%3Frealm%3Dvzw%26goto%3Dhttps%253A%252F%252Fpreorder.verizonwireless.com%253A443%252Ficonic%252Ficonic%252Fsecured%252Fscreens%252FIconicOrder.do%253Fformat%253DJSON%2526value%253D%257B%252522action%252522%253A%252522START_ORDER%252522%252C%252522custType%252522%253A%252522EXISTING%252522%252C%252522orderType%252522%253A%252522UPGRADE%252522%252C%252522lookupMtn%252522%253A%252522*(NumberA)*%252522%252C%252522lineData%252522%253A%255B%257B%252522mtn%252522%253A%252522*(NumberA)*%252522%252C%252522upgType%252522%253A%252522ALTERNATE_UPGRADE%252522%252C%252522eligibleMtn%252522%253A%252522*(NumberB)*%252522%257D%255D%257D&mboxReferrer=&mboxVersion=41 and the http headers look like this: HTTP/1.1 200 OK Server: VZW Date: Sun, 16 Sep 2012 14:55:48 GMT Cache-control: private Pragma: no-cache Expires: 0 X-dsameversion: VZW Am_client_type: genericHTML Content-type: text/html;charset=ISO-8859-1 Content-Encoding: gzip Content-Length: 6220 and HTTP/1.1 200 OK Cache-Control: no-cache Date: Sun, 16 Sep 2012 16:16:30 GMT Content-Type: text/html Expires: Thu, 01 Jan 1970 00:00:00 GMT Content-Encoding: gzip X-Powered-By: Servlet/2.5 JSP/2.1 and HTTP/1.1 302 Moved Temporarily Server: VZW Date: Sun, 16 Sep 2012 16:29:32 GMT Cache-control: private Pragma: no-cache X-dsameversion: VZW Am_client_type: genericHTML Location: https://preorder.verizonwireless.com:443/iconic/iconic/secured/screens/IconicOrder.do?format=JSON&value={%22action%22:%22START_ORDER%22,%22custType%22:%22EXISTING%22,%22orderType%22:%22UPGRADE%22,%22lookupMtn%22:%22*(*(NumberA)*%22,%22lineData%22:[{%22mtn%22:%22*(NumberA)*%22,%22upgType%22:%22ALTERNATE_UPGRADE%22,%22eligibleMtn%22:%22*(NumberB)*%22}]} Content-length: 0 ^^this last one actually returned me to a page in the middle of the process when I used the "Location:" given in this http header rather than the URL at the top of the cache page (and was signed in to Verizon's website through a separate tab), but the page it took me to had already been updated to reflect new information, it wasn't presented as of the time the actions were taken several days ago when the page was originally viewed. (It's clear I can't achieve what I'm looking for by visiting current versions of these pages on the web…I should actually probably disable my network adapter while testing this out). The cache folder seems promising, but I don't know what to make of all that hexadecimal mess - if it contains what I'm looking for and if so, how to view it. Finally, the third thing I've come across is the Google Chrome cache folder on my local machine, at ~/Library/Caches/Google/Chrome/ then there are 'Default' and 'Media Cache' folders within. There are ~4,000 files in the former averaging ~100kb each, and 100 files in the latter averaging ~900kb each. The filenames all start "f_00xxxx" except for files titled data_0 through data_4 in each folder. I'm not sure how to observe the contents of these files and don't really want to start opening them up and potentially overwriting existing cached pages, as I notice there are already some holes in the arrangement of the files which I have never deleted manually. Hopefully this is an easy question to answer for someone who knows this stuff, admittedly web stuff is my weak point. As such, I've spent the past five hours searching around and trying to provide all the information I can. I'm probably asking for a miracle - like can those cached pages full of hexadecimal data be used to recreate the representation of the information that was on screen during the process? Or could screenshots of the previously viewed webpages be lurking in the /Caches folder? I have doubt because the content wasn't viewed at a permanent link, rather it seems like the on-screen information was served by Verizon's db, and probably securely so. I'm just not sure if Chrome saves the visual rendering of the page contents somewhere, even just temporarily. Alternatively I would be happy just to get the raw data that was on the page, even if not a visual representation…I just need to be able to demonstrate the phone line that was referenced on this page: https://preorder.verizonwireless.com/iconic/iconic/secured/screens/IconicFeatures.do . Can anyone point me in the right direction?

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• error when installing mysql ruby gem on OSX 10.6.3

  - by kapil.israni

  So I am getting the same issue as mentioned here - http://stackoverflow.com/questions/1366746/gem-install-mysql-failure-in-snow-leopard But I haven't been able to get it fixed using the answers on this link. Here's a brief history - I had MAMP on my machine, but now I downloaded the latest MySQL from mysql.com and installed version 5.1.46 this new version runs fine and client "mysql" is able to connect and I also have XCode v3.2.1, since someone mentioned that it can cause issues. Here's the error - **Building native extensions. This could take a while... ERROR: Error installing mysql: ERROR: Failed to build gem native extension. /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby extconf.rb --with-mysql-config=/usr/local/mysql/bin/mysql_config mkmf.rb can't find header files for ruby at /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/ruby.h Gem files will remain installed in /Library/Ruby/Gems/1.8/gems/mysql-2.8.1 for inspection. Results logged to /Library/Ruby/Gems/1.8/gems/mysql-2.8.1/ext/mysql_api/gem_make.out**

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• Preferred method to reload page with JavaScript?

  - by Mel

  Hey Guys, which way to reload a current page (using a button) would you prefer? <input type="button" value="Reload" onClick="history.go(0)"> <input type="button" value="Reload" onClick="location.reload(true)"> <input type="button" value="Reload" onClick="window.location.reload(true)"> <input type="button" value="Reload" onClick="window.location.href=window.location.href"> <input type="button" value="Reload" onClick="document.location.reload(true)"> <input type="button" value="Reload" onClick="document.location.href=document.location.href"> As the URL of the page changes frequently AFAIK a 'fallback function' like <a href="urlOfCurrentPage.html" onclick="window.location.reload(true);return false;">Reload</a> won't work for me, right?

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• Visual Studio Package for 2005/2008/2010 ??

  - by asp2go

  We are looking to turn an internal tool we have developed into a Visual Studio Package that we would sell to other developers. The tool will impact the custom editor and/or custom languages. Visual Studio 2010 has redesigned the API's heavily to simplify much of the work involved for these types of integration but the key question we have is: What is the typical adoption pace of new Visual Studio versions? Is there any information out there on adoption rates based on history? How many shops are still using 2005? This will help us to consider whether to target just 2010 using the new APIs or whether trying to go back and support 2008 (maybe 2005) and testing it forward.

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• ASP.NET authentication login and logout with browser back button

  - by Eatdoku

  Hi, I am looking for a solution for user use the browser's back button to navigate to previous page once logged out. I have a web application build in asp.net and using a custom membership provider for authentication and authorization. Everything works fine except when the user click on the logout link to log out of the application and being redirect to a default cover page, if the use click on the BACK BUTTON on their browser, it will actually go back to where they were before and the data will still show up. Of course they can't do anything on that page, click on anything link they will be redirect to a login page again. But having those information display is making a lot users confused. i am just wondering if there is any way i can either clear the browser's history so use can't go BACK, or when they click on the back button and have them redirect to the login page. thanks

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• Ideas for networking project

  - by Chris Thompson

  Hi all, I'm a graduating senior in computer science taking a computer networks class and I'm trying to figure out my final project. I normally am not at a loss for ideas but be it senioritis or straight burn out, I've got nothing. I've done some fun stuff in the past, but I just can't seem to come up with a good idea. Given the mass of brilliance on this site, I figured it would be a good place to request some suggestions. To give you an idea of scope, it's due in about a month and I would consider myself proficient with mobile architectures like Android (although I have no iPhone experience) along with Java, C++, etc. If you can suggest an idea, I'd be happy to make it work in whatever language I know. Like I said, I'm a senior and will be graduating so I'd rather not take on something that would kill me... Also, I'd be happy to make it open source if it's an idea you'd always wanted to work on but didn't have the time to start. Thanks in advance for the help! Chris Edit 1: Thanks so much for the suggestions everyone! Unfortunately I've actually already written a chat client (for a network security class) and I think I'd run into some honor code issues if I did that again, although that's always a great option. I like the game idea and that's actually something I've never attempted before (in any capacity) although given that, I'm a little scared about time...

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• Logoff button IIS6 ASP.NET Basic Authentication

  - by willyconnor

  I have a requirement for an explicit logout button for users in a ASP.NET web app. I am using IIS6 with Basic Authentication (SSL). I can redirect to another web page but the browser keeps the session alive. I have googled around and found a way to do it by enabling an active x control to communicate with IIS and kill the session. I am in a restricted environment that does not allow forms authentication and active x controls are not forbidden as well. Has anyone else had this requirement and how have you handled it? Okay that is what I was afraid of. I have seen similar answers on the net and I was hoping someone would have a way of doing it. Thanks for your time though. I guess I can use javascript to prevent the back button like the history.back()

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• FileSystem.GetFiles() + UnauthorizedAccessException error?

  - by OverTheRainbow

  Hello, It seems like FileSystem.GetFiles() is unable to recover from the UnauthorizedAccessException exception that .Net triggers when trying to access an off-limit directory. In this case, does it mean this class/method isn't useful when scanning a whole drive and I should use some other solution (in which case: Which one?)? Here's some code to show the issue: Private Sub bgrLongProcess_DoWork(ByVal sender As System.Object, ByVal e As System.ComponentModel.DoWorkEventArgs) Handles bgrLongProcess.DoWork Dim drive As DriveInfo Dim filelist As Collections.ObjectModel.ReadOnlyCollection(Of String) Dim filepath As String 'Scan all fixed-drives for MyFiles.* For Each drive In DriveInfo.GetDrives() If drive.DriveType = DriveType.Fixed Then Try 'How to handle "Access to the path 'C:\System Volume Information' is denied." error? filelist = My.Computer.FileSystem.GetFiles(drive.ToString, FileIO.SearchOption.SearchAllSubDirectories, "MyFiles.*") For Each filepath In filelist DataGridView1.Rows.Add(filepath.ToString, "temp") 'Trigger ProgressChanged() event bgrLongProcess.ReportProgress(0, filepath) Next filepath Catch Ex As UnauthorizedAccessException 'How to ignore this directory and move on? End Try End If Next drive End Sub Thank you. Edit: What about using a Try/Catch just to have GetFiles() fill the array, ignore the exception and just resume? Private Sub bgrLongProcess_DoWork(ByVal sender As System.Object, ByVal e As System.ComponentModel.DoWorkEventArgs) Handles bgrLongProcess.DoWork 'Do lengthy stuff here Dim filelist As Collections.ObjectModel.ReadOnlyCollection(Of String) Dim filepath As String filelist = Nothing Try filelist = My.Computer.FileSystem.GetFiles("C:\", FileIO.SearchOption.SearchAllSubDirectories, "MyFiles.*") Catch ex As UnauthorizedAccessException 'How to just ignore this off-limit directory and resume searching? End Try 'Object reference not set to an instance of an object For Each filepath In filelist bgrLongProcess.ReportProgress(0, filepath) Next filepath End Sub

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• What might make "Xclients" be executed twice when boot system?

  - by ablmf

  For some special purpose, I modified /etc/X11/xinit/Xclients to start firefox instead of start Desktop Environment. # Argh! Nothing good is installed. Fall back to twm { # gosh, neither fvwm95 nor fvwm2 is available; # fall back to failsafe settings [ -x /usr/bin/xsetroot ] && /usr/bin/xsetroot -solid '#222E45' # if [ -x /usr/bin/xclock ] ; then # /usr/bin/xclock -geometry 100x100-5+5 & # elif [ -x /usr/bin/xclock ] ; then # /usr/bin/xclock -geometry 100x100-5+5 & # fi # if [ -x /usr/bin/xterm ] ; then # /usr/bin/xterm -geometry 80x50-50+150 & # fi if [ -x /usr/bin/firefox ]; then /usr/bin/firefox -chrome http://127.0.0.1/ -width 1280 -height 768 fi # if [ -x /usr/bin/twm ] ; then # exec /usr/bin/twm # fi This used to work fine until today I tested it on another computer. Firefox reports that there's another running instance of firefox which stops responding. Thus, firefox could not autostart as I expected. I connected the computer with SSH and I found there are 2 firefox processes: [root@my113 xinit]# ps -ef | grep firefox root 4479 4371 0 17:34 ? 00:00:00 /bin/sh /usr/lib/firefox-3.0b5/run-mozilla.sh /usr/lib/firefox-3.0b5/firefox -chrome http://127.0.0.1/ -width 1280 -height 768 root 4600 4479 0 17:34 ? 00:00:01 /usr/lib/firefox-3.0b5/firefox -chrome http://127.0.0.1/ -width 1280 -height 768 root 4940 4906 0 17:35 ? 00:00:00 /bin/sh /usr/lib/firefox-3.0b5/run-mozilla.sh /usr/lib/firefox-3.0b5/firefox -chrome http://127.0.0.1/ -width 1280 -height 768 root 4963 4940 0 17:35 ? 00:00:00 /usr/lib/firefox-3.0b5/firefox -chrome http://127.0.0.1/ -width 1280 -height 768 root 5717 5345 0 17:51 pts/2 00:00:00 grep firefox I guess, for some reason, "Xclients" is executed twice. But I really knows very little about XWindows, so if anyone here could give me some clues, I will appreciate!

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• A question about the order of pagination

  - by SpawnCxy

  Currently I'm deal with a history message page using Cakephp.And I got a problem about records' order.In the controller,codes about pagination as follows $this->paginate['Msg'] = array('order'=>'Msg.created desc'); $msgs = $this->paginate('Msg'); $this->set('historymsgs',$msgs); Then I got a page of messges like this: tom:I'm eighteen. Jerry:How old are you? tom:Tom. Jerry:what's your name? tom:Hi nice to meet you too! Jerry:Hello,nice to meet you! But what I need is the reversed order of the messages.How can I append a condition of Msg.created asc here? Thanks in advance.

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• How can I disable the CTRL-ALT-DEL key combination completely on XP/Vista/7?

  - by Travesty3

  I have been googling extensively to figure this out, and nobody seems to be able to give a direct answer. Let me start by saying that I'm NOT talking about requiring CTRL-ALT-DEL to enter logon information. I'm working on a golf simulator program which is used at golf centers. I need the ability to completely disable the CTRL-ALT-DEL key sequence so that the golf center customers can't get out of the program and access the computer at all. I realize there are other key combinations that need to be handled as well, we already have this entire feature working in XP, but we're going to be switching to Windows 7 soon, and CTRL-ALT-DEL is the only one that doesn't seem to work in Win7. I'd really like an all-around solution if at all possible. This same program may also be installed on a client's personal computer for an in-home golf simulator, but the computers that really need this feature (golf center computers) are provided to the golf center by us, so would the best option be to write a new shell? I don't know anything about that at all, other than others that suggest writing a new shell for kiosk mode. I'd really like a simpler option, like modifying the registry in some way. I have heard that you can remove some buttons from the menu screen that pops up, but unless I can remove pretty much all of them (including the shutdown/restart button in the bottom-right corner), this won't be enough of a solution for me. Thanks for taking the time to read this and thanks again for any help you could provide! -Travis

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