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• Career Day in kindergarten: how to demonstrate programming in 20 minutes?

  - by Péter Török

  I was invited to the kindergarten group of my elder daughter to talk, and aswer the kids' questions, about my profession. There are 26 kids of age 4-6 in the group (plus 3 teachers who are fairly scared of anything related to programming and IT themselves, but bold enough to learn new tricks). I would have about 20-30 minutes, without projector or anything. (They have an old computer though, which by its look may be a 486, and I am not even sure if it's functioning.) My research turned up excellent earlier threads, with lots of good tips: How would you explain your job to a 5-year old? Career Day: how do I make “computer programmer” sound cool to 8 year olds? What things can I teach a group of children about programming in one day? My situation is different from each of the above though. So any advice on how to teach the kids (and their teachers) in a fun way about programming is appreciated.

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• Paging enormous tables on DB2

  - by grenade

  We have a view that, without constraints, will return 90 million rows and a reporting application that needs to display paged datasets of that view. We're using nhibernate and recently noticed that its paging mechanism looks like this: select * from (select rownumber() over() as rownum, this_.COL1 as COL1_20_0_, this_.COL2 as COL2_20_0_ FROM SomeSchema.SomeView this_ WHERE this_.COL1 = 'SomeValue') as tempresult where rownum between 10 and 20 The query brings the db server to its knees. I think what's happening is that the nested query is assigning a row number to every row satisfied by the where clause before selecting the subset (rows 10 - 20). Since the nested query will return a lot of rows, the mechanism is not very efficient. I've seen lots of tips and tricks for doing this efficiently on other SQL platforms but I'm struggling to find a DB2 solution. In fact an article on IBM's own site recommends the approach that nhibernate has taken. Is there a better way?

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• Freezing Eclipse

  - by Radek Šimko

  I use Eclipse for programming in PHP and Java(Android) and sometimes Python, unfortunately Eclipse is nowadays much more often freezing. Often when I write this bracket "[" for defining an array in PHP, Eclipse just freeze and I have to close it manualy and start again. I've noted also, that Eclipse is consuming really much of my RAM... 200-300MiB of my available memory is nothing special. :-( Is there any way to check, what is consuming the memory in Eclipse and why it's freezing? I'm running on Windows Vista, 3GB RAM.

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• VBA Outlook Mail .display, recording when/if sent manually

  - by ExcelCyclist

  My code displays a message with basic subject, body, attachment. Next the user manually updates and customizes the message and should send it. I want to record when (if) the email is sent. Is this possible or any tips? My environment is Office 2007 with an excel based macro going to Outlook. [Excerpt] Dim OutApp As Outlook.Application Dim OutMail As Outlook.MailItem Set OutApp = CreateObject("Outlook.Application") OutApp.Session.Logon Set OutMail = OutApp.CreateItem(olMailItem) With OutMail .To = Email '.CC = .Subject = Subj .BodyFormat = olFormatHTML .Body = Msg '.HTMLBody = Msg If Not FileAttach = vbNullString Then .Attachments.Add (FileAttach) .Display End With

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• Is it worthwhile learning about Emacs? [closed]

  - by dole doug

  Hi there Some time ago, I've heard what a great tool Emacs can be. I've read some papers about it and some watched some video too. I've read that emacs is great not only for developers but for usual users too...so i decided to start learning how to use it and wok with it. The problem is that I'm a MS Windows user and I learn in my spare time PHP and C(I also did some products on those languages, but i still considering myself in learning stage). Another problem is that I learn alone (no friends around to ask/learn from them, programming related stuff). Can you give me some tips about how to use those type of tools(especially those written for gnu/unix) with "poor" GUI but rich features? Do you recommend to use the specific windows written applications only and forget about those which come from GNU?

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• Tomcat, Hibernate and the java.io.EOFException

  - by Marco

  Hi, My Java application, which uses Hibernate and it's hosted by Tomcat 6.0, gets the following exception after a long time of inactivity when it tries to access the DB: com.mysql.jdbc.CommunicationsException: Communications link failure due to underlying exception: ** BEGIN NESTED EXCEPTION ** java.io.EOFException STACKTRACE: java.io.EOFException at com.mysql.jdbc.MysqlIO.readFully(MysqlIO.java:1963) at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:2375) at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2874) at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1623) at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:1715) at com.mysql.jdbc.Connection.execSQL(Connection.java:3249) at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1268) at com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:1403) at org.hibernate.jdbc.AbstractBatcher.getResultSet(AbstractBatcher.java:208) at org.hibernate.loader.Loader.getResultSet(Loader.java:1812) at org.hibernate.loader.Loader.doQuery(Loader.java:697) at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:259) at org.hibernate.loader.Loader.doList(Loader.java:2232) at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2129) at org.hibernate.loader.Loader.list(Loader.java:2124) at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:401) at org.hibernate.hql.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:363) at org.hibernate.engine.query.HQLQueryPlan.performList(HQLQueryPlan.java:196) at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1149) at org.hibernate.impl.QueryImpl.list(QueryImpl.java:102) Any tips? Thanks

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• GetVersionEx Not Working on Windows 7?!

  - by Andreas Rejbrand

  On my Windows 7 system, the GetVersionEx Windows API function returns "6.0", indicating Windows Vista, when it should return "6.1". If it matters, I used the following Delphi code: function winver: string; var ver: TOSVersionInfo; begin ver.dwOSVersionInfoSize := SizeOf(ver); if GetVersionEx(ver) then with ver do result := IntToStr(dwMajorVersion) + '.' + IntToStr(dwMinorVersion) + '.' + IntToStr(dwBuildNumber) + ' (' + szCSDVersion + ')'; end; and the string "6.0.6002 (Service Pack 2)" was returned. Isn't this highly odd?

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• How to stop NpgsqlDataReader from blocking?

  - by Swingline Rage

  Running the following code against a large PostgreSQL table, the NpgsqlDataReader object blocks until all data is fetched. NpgsqlCommand cmd = new NpgsqlCommand(strQuery, _conn); NpgsqlDataReader reader = cmd.ExecuteReader(); // <-- takes 30 seconds How can I get it to behave such that it doesn't prefetch all the data? I want to step through the resultset row by row without having it fetch all 15 GB into memory at once. I know there were issues with this sort of thing in Npgsql 1.x but I'm on 2.0. This is against a PostgreSQL 8.3 database on XP/Vista/7. I also don't have any funky "force Npgsql to prefetch" stuff in my connection string. I'm at a complete loss for why this is happening.

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• Link error after update from VS2008 to VS2010

  - by Caihua

  Hi all, Today I met an link problem after updating the VS version from 2008 to 2010, the error is something like this: error LNK2019: unresolved external symbol "public: static void __cdecl std::_String_base::_Xran(void)" (?_Xran@_String_base@std@@SAXXZ) referenced in function "public: class std::basic_string,class std::allocator & __thiscall std::basic_string,class std::allocator ::assign(class std::basic_string,class std::allocator const &,unsigned int,unsigned int)" (?assign@?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QAEAAV12@ABV12@II@Z) error LNK2019: unresolved external symbol "public: static void __cdecl std::_String_base::_Xlen(void)" (?_Xlen@_String_base@std@@SAXXZ) referenced in function "protected: bool __thiscall std::basic_string,class std::allocator ::_Grow(unsigned int,bool)" (?_Grow@?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@IAE_NI_N@Z) I have googled this issue on the web, and found a similar post in this address : http://social.msdn.microsoft.com/Forums/en/vcgeneral/thread/5ac28a31-3339-4db1-90f4-68edad360309 But none of these answers can solve my problem. Could anyone give me some tips on how to solve this issue? Thanks a lot for the help!

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• Java program strange behavior, how to fix it ?

  - by Frank

  My notebook has Intel CPU, running Windows Vista. My program looks like this : public class Tool_Lib_Simple { public static void main(String[] args) { System.out.println("123"); } } When I run it, I expect to see : "123", but the output was : "Hi NM : How are you NM ?" which was the old output from two days ago before I changed my program. If I copy this program into another project in Netbean 6.7, it will run correctly and output "123", and if I change the program name from "Tool_Lib_Simple" to something else, it will also output "123", but just not under the name of "Tool_Lib_Simple" in the current project's src directory, I've deleted the "build" directory and did re-compile, re-build, it still gives me "Hi NM : How are you NM ?" as a result, seems to me the old version of my program is saved in the hard drive or ram and got stuck there, I've programmed many years, hardly ever encounter this kind of problem, how to fix this ? Frank

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• TAPI App on 64bits OS

  - by mvg

  I have a TAPI Application (Delphi 2007) working on 32bits OSs (XP, Vista, Win7). The TAPI server is 32bits Windows 2003 SP2. While TAPI APP is running on 64bits OS, I can connect to the line but i cannot get TAPI messages on my App. I can see messages have arrived on machine through Tracing tapisrv but the WaitForSingleObjectEx to the event handle (returned by lineInitializeEx) is never signaled (always returns WAIT_TIMEOUT). I've also tried C++ code and 64bits compiler but the 64bits App had the same behavior (except not even starting on 32bits OS :-) ). Is there any ideas how i can receive the TAPI messages to my App??? EDIT: Well, it seems that only the messages regarding incoming calls are cut. If (while App is running) i execute "tcmsetup /c /d" (=disable TAPI) then i DO receive LINE_CLOSE and LINE_REMOVE messages. Then, if i execute "tcmsetup /c server_name", i DO get the LINE_CREATE message. I can lineOpen the new line provided but still CANNOT get LINE_APPNEWCALL, LINE_CALLSTATE etc

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• is it possible to achieve an image clipping/masking effect with html + css3?

  - by sa125

  Hi - I'm trying to place a nice border around an image that's 250x250, using only html and css. The markup is this: <div id="img-container"><img src="pic.jpg" border="0"/></div> And the css is: #img-container { height: 225px; width: 225px; padding: 3px; border: 1px solid black; z-index: 10; position: relative; overflow: hidden; border-radius: 10px; } #img-container img { z-index: 5; } Basically, I want the div container to clip the picture's edges that exceed its boundaries. This will achieve the rounded edges effect using the border-radius property (-moz-border-radius, -webkit-border-radius, etc) - if it actually works or could even be done. Looking for tips and tricks on this. Thanks. And, yes, I'm obviously not a web designer :)

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• What Simple Changes Made the Biggest Improvements to Your Delphi Programs

  - by lkessler

  I have a Delphi 2009 program that handles a lot of data and needs to be as fast as possible and not use too much memory. What small simple changes have you made to your Delphi code that had the biggest impact on the performance of you program by noticeably reducing execution time or memory use? Thanks everyone for all your answers. Many great tips. For completeness, I'll post a few important articles on Delphi optimization that I found. Before you start optimizing Delphi code at About.com Speed and Size: Top 10 Tricks also at About.com Code Optimization Fundamentals and Delphi Optimization Guidelines at High Performance Delphi, relating to Delphi 7 but still very pertinent.

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• ASP.NET MVC TDD with LINQ and SQL database

  - by dean nolan

  I am trying to start a new MVC project with tests and I thought the best way to go would have 2 databases. 1 for testing against and 1 for when I run the app and use it (also test really as it's not production yet). For the test database I was thinking of putting create table scripts and fill data scripts within the test setup method and then deleting all this in the tear down method. I am going to be using Linq to SQL though and I don't think that will allow me to do this? Will I have to just go the ADO route if I want to do it this way? Or should I just use a mock object and store data as an array or something?. Any tips on best practices? How did Jeff go about doing this for StackOveflow?

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• "Disabled use of AcceptEx() WinSock2 API" error on Windows 7 using Tomcat

  - by Richard

  When starting Tomcat 6 on Windows 7 Enterprise with JRE 6 using C:\Program Files\Apache Software Foundation\Tomcat 6.0\bin\tomcat6.exe the application does not open and my event viewer has the message: "Disabled use of AcceptEx() WinSock2 API." The same installer of Tomcat worked on Windows Vista before I upgraded my operating system. Can anyone please suggest a way to fix this? The only site I can find mentioning this is http://www.apachelounge.com/viewtopic.php?p=4418 which suggests using this config setting "Win32DisableAcceptEx" - but it's for Apache, not Tomcat, and I have no idea where in what config file it might need to go in Tomcat.

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• VBA olMailItem .display, recording when/if sent manually

  - by ExcelCyclist

  My code to displays a message with basic subject, body, attachment. Next the user manually updates and customizes the message and should send it. I want to record when (if) the email is sent. Is this possible or any tips? My environment is Office 2007 with an excel based macro going to Outlook. [Excerpt] Dim OutApp As Outlook.Application Dim OutMail As Outlook.MailItem Set OutApp = CreateObject("Outlook.Application") OutApp.Session.Logon Set OutMail = OutApp.CreateItem(olMailItem) With OutMail .To = Email '.CC = .Subject = Subj .BodyFormat = olFormatHTML .Body = Msg '.HTMLBody = Msg If Not FileAttach = vbNullString Then .Attachments.Add (PathFile) .Display End With

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• "Could not load file or assembly 'XXX.YYY' or one of its dependencies. The system cannot find the file specified."

  - by Niall Collins

  I have a .net visual studio solution with a number of projects (class libraries and a web application). I did some refractoring which moved files between projects, created new projects, deleted ones not being used and renamed some existing projects. The solution builds without an issue but when I run the web application, the following exception occurs: "Could not load file or assembly 'XXX.YYY' or one of its dependencies. The system cannot find the file specified." The project called XXX.YYY which was deleted in the refractoring outputed a dll called XXX.YYY. But this isnt used anywhere in the application. I deleted the web applications obj directory and bin folder and rebuild but it still occurs. Anyone have any ideas when this might be occurring, any tips??

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• NFOP performance problem

  - by Jay Stevens

  We're using NFOP in a project (C#, ASP.NET 2.0) to ultimately return PDF files to the user. The process currently goes like this: Stored Procedure - XML XML - XSLT - XSL-FO XSL-FO - NFOP - PDF This works fine, the PDF is generated BEAUTIFULLY. The problem is that it takes 300+ seconds to do it. The ANTS profiler indicates that the problem is sitting in the driver.run() method inside of NFOP. It's not like this is a gargantuan amount of data, the size of the xsl-fo source going into the nfop driver object is ~980k. What's the most likely source and resolution of this problem? ANY hints or tips or answers are most appreciated, we were supposed to head to VA scan at 11 am. :|

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• Creating tooltips for each field in Sharepoint form.

  - by ephieste

  I want to create tool tips for each part in a form which employees have to fill in a share point web page. When users move the mouse cursor on each field (Title, description, department etc.) the related tip will be automatically became visible as a simple pop-up (tool tip) and summarize what they should write there. and when the mouse cursor is not on one of these fields there is no tool tip. How can I design such a system via share point designer? I am not able use any add ons. I can't upload any additional things to the server. I have to make page based design. I would be glad if you kindly help me.

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• A Program that sits in the Notification Area

  - by Jimbob

  Hello, Thanks for taking the time to read my question. If I build a program, how can I get it to hide in the notifications area(windows 7, cant remember what it's called in XP or Vista) when I minimize it? Like say a Torrent program, or a AntiVirus program. Also I'd like to know, how can I hide it from the notifications area and bring it up when it a hotkey command is entered? Any clues on any of these two problems I'm having for an a program I am doing would be great. Thankyou

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• See return value in C#

  - by Snake

  Hi, Consider the following piece of code: As you can see we are on line 28. Is there any way to see the return value of the function at this point, without letting the code return to the caller function? Foo.Bar() is a function call which generates a unique path (for example). So it's NOT constant. In VB.NET it's possible by entering the function's name in the Watch, which will then threat it as a variable. But in C# this is not possible, any other tips? PS: rewriting is not an option.

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• Ruby - Subclassing array to make it randomize when flattened

  - by Markus O'Reilly

  I'm trying to subclass Array in ruby to make it randomize its elements when flatten! is called. Looking at the source code for Array#flatten (http://ruby-doc.org/core/classes/Array.src/M002218.html), it looks like it should recursively call flatten! on any array contained within an array. So, I tried doing something like this: class RandArray < Array def randomize! self.sort!{rand(3)-1} end def flatten! randomize! super end end However, when a normal array contains my RandArray and flatten is called on the normal array, flatten! is never called in my array. I figure ruby is just calling some other method to flatten the arrays recursively, but I can't figure out what that is. Any tips?

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• mod_php / mod_suphp / FastCGI | Which do you recommend and why.

  - by Saif Bechan

  I am at the point that I have to choose on what type of setup my application should run. I know there are some types available where apache runs smooth on, but they all have there downsides. System: Apache 2 / PHP 5.2 I hope you can give me some tips from firsthand experience. To give you an example of what to be covered. - Performance - Ease of setup - Security I know this does not really involve programming, but I have seen post concerning this and I know that you guys/girls here are certainly qualified to comment on this subject.

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• Downloading RSS using python

  - by Vojtech R.

  Hi, I have list of 200 rss feeds, which I have to downloading. It's continuous process - I have to download every post, nothing can be missing, but also no duplicates. So best practice should be remember last update of feed and control it for change in x-hour interval? And how to handle if downloader will be restarted? So downloader should remember, what were downloaded and dont download it again... It's somewhere implemented yet? Or any tips for article? Thanks

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• how to better use of eclipse code templates (PHP)?

  - by pocketfullofcheese

  One particular problem I was having was using ${word_selection} in an Eclipse PDT template. I was recently trying to use some code templates with Eclipse PDT 2.1 to speed up some common tasks. We use a lot of getters/setters, so I wrote the following template. function get${word_selection}() { return $$this->getData('${word_selection}'); } function set${word_selection}($$${word_selection}) { $$this->setData('${word_selection}', $$${word_selection}); } I named the template "getset" and the only way I know to use the Code Assist is to type: "getset" then hit my code assist keys (I have it set to Esc, but I think the default was Ctrl+Space). The problem is, this doesn't actually let me select a word to be used by the ${word_selection}. how do I type in my template name, hit the key combo, and have a word selected all at the same time? I also want to know what kinds of templates people have set up and any other tips for using templates to speed of programming.

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