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• Guiding a Robot Through a Path

  - by Hamza Yerlikaya

  I have a field filled with obstacles, I know where they are located, and I know the robot's position. Using a path-finding algorithm, I calculate a path for the robot to follow. Now my problem is, I am guiding the robot from grid to grid but this creates a not-so-smooth motion. I start at A, turn the nose to point B, move straight until I reach point B, rinse and repeat until the final point is reached. So my question is: What kind of techniques are used for navigating in such an environment so that I get a smooth motion? The robot has two wheels and two motors. I change the direction of the motor by turning the motors in reverse. EDIT: I can vary the speed of the motors basically the robot is an arduino plus ardumoto, I can supply values between 0-255 to the motors on either direction.

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• How do I compile Android Browser (or other android-supplied applications)

  - by afriza

  I want to add support for Arabic (or other languages which are currently unsupported) to the applications supplied by android platform (e.g. Browser) without having root-access. To add Arabic support (at least displaying only) in a normal application (using developer SDK), I will need to: Add fonts Modify (reshape) the characters to be rendered For illustration, if I have string a aaa, I will need to change a aaa into a bcd because letter a at the beginning, middle, and end of a word need to be changed to b,c and d respectively) But now I want to compile android's Browser (and other apps). I am planning to get the source codes for these applications and their dependencies and bundle them as stand-alone applications which do not require root-access, and thus do not void the warranty. Other solutions which void the warranty can be obtained here. My Questions: Is the application's (e.g. Browser's) source code + 'developer SDK' enough to accomplish this? Do I need to get the source code + the development environment for the android platform? Any tips?

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• How do I mock memory allocation failures ?

  - by Andrei Ciobanu

  I want to extensively test some pieces of C code for memory leaks. On my machine I have 4 Gb of RAM, so it's very unlikely for a dynamic memory allocation to fail. Still I want to see the comportment of the code if memory allocation fails, and see if the recover mechanism is "strong" enough. What do you suggest ? How do I emulate an environment with lower memory specs ? How do i mock my tests ? EDIT: I want my tests to be code independent. I only have "access" to return values for different functions in the library I am testing. I am not supposed to write "test logic" inside the code I am testing.

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• Need Descriptive architecture to develop file server in dot net.

  - by Vivek

  Hello All, I have to develop a file server service that transfer file form a specified location to its client.Client when starts, requests file to server for current date. Server transfer those file to client. Now constrains are as 1.Application run in intranet. 2.Need to transfer multiple file at a single transaction. 3.File size may be in GB. 4.System runs in real time environment.So proper transaction and acknowledgment needed. 5.Application develop in .net. 5.More than one client can present. Now please help to decide architecture and .net technology (WCF (Http binding) WCF (net tcp binding) ,Socket Programing ( i want to use WCF )) that i choose to develop file server. and Please refer some sample application.

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• ASP.NET SetAuthCookie Impersonation Help

  - by rlb.usa

  Hello SO, I'm trying to do user impersonation for a web application we have. The user selects the user they'd like to emulate/impersonate and then clicks the button which fires this: protected void uxImpersonate_Click(object sender, EventArgs e) { ... FormsAuthentication.SetAuthCookie(uxUserToEmulate.SelectedValue, false); Response.Redirect("Impersonation.aspx"); //reload page manually } We have a dev - test - production server environment and on two servers this works just fine, but on another one, in all browsers, it kicks me to the login screen. What's going on and how can I fix it? We're on ASP.NET 2.0, and I'm using http://stackoverflow.com/questions/549016/user-impersonation-with-asp-net-forms-authentication as a guide. UPDATE: It appears that the user actually is impersonated successfully but is loosing their Role as admin (only Admin Role's can access this impersonation page).

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• Ruby gems gone after after jruby install

  - by James

  Today I installed jruby by downloading it, extracting it to /home/james/jruby-1.4.0 and adding the following line to .bashrc export JRUBY_HOME=/home/james/jruby-1.4.0 export PATH=$JRUBY_HOME/bin:$PATH And then I installed some jruby gems via jruby -S gem install ... Jruby works fine, but this seemed to have cause two problems: 1) When I try to run a ruby (not jruby) on rails migration, I see: Missing the Rails gem. Please `gem install -v= rails`, update your RAILS_GEM_VERSION setting in config/environment.rb for the Rails version you do have installed, or comment out RAILS_GEM_VERSION to use the latest version installed. 2) when I do gem list --local, I only see the gems that I've installed for jruby. Launching web applications via ruby script/server succeeds without any warnings. Please help.

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• "Use of undefined constant CURLOPT_PROTOCOLS and CURLPROTO_HTTP" but it works?

  - by Dave

  Hi on our dev environment we have show all errors, warnings and notices. I'm getting this: Notice: Use of undefined constant CURLOPT_PROTOCOLS - assumed 'CURLOPT_PROTOCOLS' in C:\notion\implementation\development\asterix\library\ExternalLibs\panda.php on line 69 Notice: Use of undefined constant CURLPROTO_HTTP - assumed 'CURLPROTO_HTTP' in C:\notion\implementation\development\asterix\library\ExternalLibs\panda.php on line 69 The code on line 69: curl_setopt($curl, CURLOPT_PROTOCOLS, CURLPROTO_HTTP); But the CURL code works, it goes off to the other server and retrieves whats necessary. What do these notices mean? Thanks very much.

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• Server 2003 SP2 BSOD caused by fltmgr.sys

  - by MasterMax1313

  I'm running into a problem where a Server 2003 SP2 box has started crashing roughly once an hour, BSODing out with the message that fltmgr.sys is probably the cause. I ran dumpchk.exe on the memory.dmp file, indicating the same thing. Any thoughts on typical root causes? The following is the error code I'm seeing: Error code 0000007e, parameter1 c0000005, parameter2 f723e087, parameter3 f78cea8c, parameter4 f78ce788. After running dumpchk on the memory.dmp file, I get the following note: Probably caused by : fltmgr.sys ( fltmgr!FltGetIrpName+63f ) The full log is here: Microsoft (R) Windows Debugger Version 6.12.0002.633 X86 Copyright (c) Microsoft Corporation. All rights reserved. Loading Dump File [c:\windows\memory.dmp] Kernel Complete Dump File: Full address space is available Symbol search path is: *** Invalid *** **************************************************************************** * Symbol loading may be unreliable without a symbol search path. * * Use .symfix to have the debugger choose a symbol path. * * After setting your symbol path, use .reload to refresh symbol locations. * **************************************************************************** Executable search path is: ********************************************************************* * Symbols can not be loaded because symbol path is not initialized. * * * * The Symbol Path can be set by: * * using the _NT_SYMBOL_PATH environment variable. * * using the -y <symbol_path> argument when starting the debugger. * * using .sympath and .sympath+ * ********************************************************************* *** ERROR: Symbol file could not be found. Defaulted to export symbols for ntkrnlpa.exe - Windows Server 2003 Kernel Version 3790 (Service Pack 2) UP Free x86 compatible Product: Server, suite: TerminalServer SingleUserTS Built by: 3790.srv03_sp2_gdr.101019-0340 Machine Name: Kernel base = 0x80800000 PsLoadedModuleList = 0x8089ffa8 Debug session time: Wed Oct 5 08:48:04.803 2011 (UTC - 4:00) System Uptime: 0 days 14:25:12.085 ********************************************************************* * Symbols can not be loaded because symbol path is not initialized. * * * * The Symbol Path can be set by: * * using the _NT_SYMBOL_PATH environment variable. * * using the -y <symbol_path> argument when starting the debugger. * * using .sympath and .sympath+ * ********************************************************************* *** ERROR: Symbol file could not be found. Defaulted to export symbols for ntkrnlpa.exe - Loading Kernel Symbols ............................................................... ................................................. Loading User Symbols Loading unloaded module list ... ******************************************************************************* * * * Bugcheck Analysis * * * ******************************************************************************* Use !analyze -v to get detailed debugging information. BugCheck 7E, {c0000005, f723e087, f78dea8c, f78de788} ***** Kernel symbols are WRONG. Please fix symbols to do analysis. *** ERROR: Symbol file could not be found. Defaulted to export symbols for fltmgr.sys - --omitted-- Probably caused by : fltmgr.sys ( fltmgr!FltGetIrpName+63f ) Followup: MachineOwner --------- ----- 32 bit Kernel Full Dump Analysis DUMP_HEADER32: MajorVersion 0000000f MinorVersion 00000ece KdSecondaryVersion 00000000 DirectoryTableBase 004e7000 PfnDataBase 81600000 PsLoadedModuleList 8089ffa8 PsActiveProcessHead 808a61c8 MachineImageType 0000014c NumberProcessors 00000001 BugCheckCode 0000007e BugCheckParameter1 c0000005 BugCheckParameter2 f723e087 BugCheckParameter3 f78dea8c BugCheckParameter4 f78de788 PaeEnabled 00000001 KdDebuggerDataBlock 8088e3e0 SecondaryDataState 00000000 ProductType 00000003 SuiteMask 00000110 Physical Memory Description: Number of runs: 3 (limited to 3) FileOffset Start Address Length 00001000 0000000000001000 0009e000 0009f000 0000000000100000 bfdf0000 bfe8f000 00000000bff00000 00100000 Last Page: 00000000bff8e000 00000000bffff000 KiProcessorBlock at 8089f300 1 KiProcessorBlock entries: ffdff120 Windows Server 2003 Kernel Version 3790 (Service Pack 2) UP Free x86 compatible Product: Server, suite: TerminalServer SingleUserTS Built by: 3790.srv03_sp2_gdr.101019-0340 Machine Name:*** ERROR: Module load completed but symbols could not be loaded for srv.sys Kernel base = 0x80800000 PsLoadedModuleList = 0x8089ffa8 Debug session time: Wed Oct 5 08:48:04.803 2011 (UTC - 4:00) System Uptime: 0 days 14:25:12.085 start end module name 80800000 80a50000 nt Tue Oct 19 10:00:49 2010 (4CBDA491) 80a50000 80a6f000 hal Sat Feb 17 00:48:25 2007 (45D69729) b83d4000 b83fe000 Fastfat Sat Feb 17 01:27:55 2007 (45D6A06B) b8476000 b84a1000 RDPWD Sat Feb 17 00:44:38 2007 (45D69646) b8549000 b8554000 TDTCP Sat Feb 17 00:44:32 2007 (45D69640) b8fe1000 b9045000 srv Thu Feb 17 11:58:17 2011 (4D5D53A9) b956d000 b95be000 HTTP Fri Nov 06 07:51:22 2009 (4AF41BCA) b9816000 b982d780 hgfs Tue Aug 12 20:36:54 2008 (48A22CA6) b9b16000 b9b20000 ndisuio Sat Feb 17 00:58:25 2007 (45D69981) b9cf6000 b9d1ac60 iwfsd Wed Sep 29 01:43:59 2004 (415A4B9F) b9e5b000 b9e62000 parvdm Tue Mar 25 03:03:49 2003 (3E7FFF55) b9e63000 b9e67860 lgtosync Fri Sep 12 04:38:13 2003 (3F6185F5) b9ed3000 b9ee8000 Cdfs Sat Feb 17 01:27:08 2007 (45D6A03C) b9f10000 b9f2e000 EraserUtilRebootDrv Thu Jul 07 21:45:11 2011 (4E166127) b9f2e000 b9f8c000 eeCtrl Thu Jul 07 21:45:11 2011 (4E166127) b9f8c000 b9f9d000 Fips Sat Feb 17 01:26:33 2007 (45D6A019) b9f9d000 ba013000 mrxsmb Fri Feb 18 10:22:23 2011 (4D5E8EAF) ba013000 ba043000 rdbss Wed Feb 24 10:54:03 2010 (4B854B9B) ba043000 ba0ad000 SPBBCDrv Mon Dec 14 23:39:00 2009 (4B2712E4) ba0ad000 ba0d7000 afd Thu Feb 10 08:42:18 2011 (4D53EB3A) ba0d7000 ba108000 netbt Sat Feb 17 01:28:57 2007 (45D6A0A9) ba108000 ba19c000 tcpip Sat Aug 15 05:53:38 2009 (4A8685A2) ba19c000 ba1b5000 ipsec Sat Feb 17 01:29:28 2007 (45D6A0C8) ba275000 ba288600 NAVENG Fri Jul 29 08:10:02 2011 (4E32A31A) ba289000 ba2ae000 SYMEVENT Thu Apr 15 21:31:23 2010 (4BC7BDEB) ba2ae000 ba42d300 NAVEX15 Fri Jul 29 08:07:28 2011 (4E32A280) ba42e000 ba479000 SRTSP Fri Mar 04 15:31:08 2011 (4D714C0C) ba485000 ba487b00 dump_vmscsi Wed Apr 11 13:55:32 2007 (461D2114) ba4e1000 ba540000 update Mon May 28 08:15:16 2007 (465AC7D4) ba568000 ba59f000 rdpdr Sat Feb 17 00:51:00 2007 (45D697C4) ba59f000 ba5b1000 raspptp Sat Feb 17 01:29:20 2007 (45D6A0C0) ba5b1000 ba5ca000 ndiswan Sat Feb 17 01:29:22 2007 (45D6A0C2) ba5da000 ba5e4000 dump_diskdump Sat Feb 17 01:07:44 2007 (45D69BB0) ba66a000 ba67e000 rasl2tp Sat Feb 17 01:29:02 2007 (45D6A0AE) ba67e000 ba69a000 VIDEOPRT Sat Feb 17 01:10:30 2007 (45D69C56) ba69a000 ba6c1000 ks Sat Feb 17 01:30:40 2007 (45D6A110) ba6c1000 ba6d5000 redbook Sat Feb 17 01:07:26 2007 (45D69B9E) ba6d5000 ba6ea000 cdrom Sat Feb 17 01:07:48 2007 (45D69BB4) ba6ea000 ba6ff000 serial Sat Feb 17 01:06:46 2007 (45D69B76) ba6ff000 ba717000 parport Sat Feb 17 01:06:42 2007 (45D69B72) ba717000 ba72a000 i8042prt Sat Feb 17 01:30:40 2007 (45D6A110) baff0000 baff3700 CmBatt Sat Feb 17 00:58:51 2007 (45D6999B) bf800000 bf9d3000 win32k Thu Mar 03 08:55:02 2011 (4D6F9DB6) bf9d3000 bf9ea000 dxg Sat Feb 17 01:14:39 2007 (45D69D4F) bf9ea000 bf9fec80 vmx_fb Sat Aug 16 07:23:10 2008 (48A6B89E) bf9ff000 bfa4a000 ATMFD Tue Feb 15 08:19:22 2011 (4D5A7D5A) bff60000 bff7e000 RDPDD Sat Feb 17 09:01:19 2007 (45D70AAF) f7214000 f723a000 KSecDD Mon Jun 15 13:45:11 2009 (4A3688A7) f723a000 f725f000 fltmgr Sat Feb 17 00:51:08 2007 (45D697CC) f725f000 f7272000 CLASSPNP Sat Feb 17 01:28:16 2007 (45D6A080) f7272000 f7283000 symmpi Mon Dec 13 16:03:14 2004 (41BE0392) f7283000 f72a2000 SCSIPORT Sat Feb 17 01:28:41 2007 (45D6A099) f72a2000 f72bf000 atapi Sat Feb 17 01:07:34 2007 (45D69BA6) f72bf000 f72e9000 volsnap Sat Feb 17 01:08:23 2007 (45D69BD7) f72e9000 f7315000 dmio Sat Feb 17 01:10:44 2007 (45D69C64) f7315000 f733c000 ftdisk Sat Feb 17 01:08:05 2007 (45D69BC5) f733c000 f7352000 pci Sat Feb 17 00:59:03 2007 (45D699A7) f7352000 f7386000 ACPI Sat Feb 17 00:58:47 2007 (45D69997) f7487000 f7490000 WMILIB Tue Mar 25 03:13:00 2003 (3E80017C) f7497000 f74a6000 isapnp Sat Feb 17 00:58:57 2007 (45D699A1) f74a7000 f74b4000 PCIIDEX Sat Feb 17 01:07:32 2007 (45D69BA4) f74b7000 f74c7000 MountMgr Sat Feb 17 01:05:35 2007 (45D69B2F) f74c7000 f74d2000 PartMgr Sat Feb 17 01:29:25 2007 (45D6A0C5) f74d7000 f74e7000 disk Sat Feb 17 01:07:51 2007 (45D69BB7) f74e7000 f74f3000 Dfs Sat Feb 17 00:51:17 2007 (45D697D5) f74f7000 f7501000 crcdisk Sat Feb 17 01:09:50 2007 (45D69C2E) f7507000 f7517000 agp440 Sat Feb 17 00:58:53 2007 (45D6999D) f7517000 f7522000 TDI Sat Feb 17 01:01:19 2007 (45D69A2F) f7527000 f7532000 ptilink Sat Feb 17 01:06:38 2007 (45D69B6E) f7537000 f7540000 raspti Sat Feb 17 00:59:23 2007 (45D699BB) f7547000 f7556000 termdd Sat Feb 17 00:44:32 2007 (45D69640) f7557000 f7561000 Dxapi Tue Mar 25 03:06:01 2003 (3E7FFFD9) f7577000 f7580000 mssmbios Sat Feb 17 00:59:12 2007 (45D699B0) f7587000 f7595000 NDProxy Wed Nov 03 09:25:59 2010 (4CD162E7) f75a7000 f75b1000 flpydisk Tue Mar 25 03:04:32 2003 (3E7FFF80) f75b7000 f75c0080 SRTSPX Fri Mar 04 15:31:24 2011 (4D714C1C) f75d7000 f75e3000 vga Sat Feb 17 01:10:30 2007 (45D69C56) f75e7000 f75f2000 Msfs Sat Feb 17 00:50:33 2007 (45D697A9) f75f7000 f7604000 Npfs Sat Feb 17 00:50:36 2007 (45D697AC) f7607000 f7615000 msgpc Sat Feb 17 00:58:37 2007 (45D6998D) f7617000 f7624000 netbios Sat Feb 17 00:58:29 2007 (45D69985) f7627000 f7634000 wanarp Sat Feb 17 00:59:17 2007 (45D699B5) f7637000 f7646000 intelppm Sat Feb 17 00:48:30 2007 (45D6972E) f7647000 f7652000 kbdclass Sat Feb 17 01:05:39 2007 (45D69B33) f7657000 f7661000 mouclass Tue Mar 25 03:03:09 2003 (3E7FFF2D) f7667000 f7671000 serenum Sat Feb 17 01:06:44 2007 (45D69B74) f7677000 f7682000 fdc Sat Feb 17 01:07:16 2007 (45D69B94) f7687000 f7694b00 vmx_svga Sat Aug 16 07:22:07 2008 (48A6B85F) f7697000 f76a0000 watchdog Sat Feb 17 01:11:45 2007 (45D69CA1) f76a7000 f76b0000 ndistapi Sat Feb 17 00:59:19 2007 (45D699B7) f76b7000 f76c6000 raspppoe Sat Feb 17 00:59:23 2007 (45D699BB) f76c8000 f7707000 NDIS Sat Feb 17 01:28:49 2007 (45D6A0A1) f7707000 f770f000 kdcom Tue Mar 25 03:08:00 2003 (3E800050) f770f000 f7717000 BOOTVID Tue Mar 25 03:07:58 2003 (3E80004E) f7717000 f771e000 intelide Sat Feb 17 01:07:32 2007 (45D69BA4) f771f000 f7726000 dmload Tue Mar 25 03:08:08 2003 (3E800058) f777f000 f7786000 dxgthk Tue Mar 25 03:05:52 2003 (3E7FFFD0) f7787000 f778e000 vmmemctl Tue Aug 12 20:37:25 2008 (48A22CC5) f77cf000 f77d6280 vmxnet Mon Sep 08 21:17:10 2008 (48C5CE96) f77d7000 f77df000 audstub Tue Mar 25 03:09:12 2003 (3E800098) f77ef000 f77f7000 Fs_Rec Tue Mar 25 03:08:36 2003 (3E800074) f77f7000 f77fe000 Null Tue Mar 25 03:03:05 2003 (3E7FFF29) f77ff000 f7806000 Beep Tue Mar 25 03:03:04 2003 (3E7FFF28) f7807000 f780f000 mnmdd Tue Mar 25 03:07:53 2003 (3E800049) f780f000 f7817000 RDPCDD Tue Mar 25 03:03:05 2003 (3E7FFF29) f7817000 f781f000 rasacd Tue Mar 25 03:11:50 2003 (3E800136) f7878000 f7897000 Mup Tue Apr 12 15:05:46 2011 (4DA4A28A) f7897000 f7899980 compbatt Sat Feb 17 00:58:51 2007 (45D6999B) f789b000 f789e900 BATTC Sat Feb 17 00:58:46 2007 (45D69996) f789f000 f78a1b00 vmscsi Wed Apr 11 13:55:32 2007 (461D2114) f79af000 f79b0280 vmmouse Mon Aug 11 07:16:51 2008 (48A01FA3) f79b1000 f79b2280 swenum Sat Feb 17 01:05:56 2007 (45D69B44) f7b4a000 f7bdf000 Ntfs Sat Feb 17 01:27:23 2007 (45D6A04B) Unloaded modules: ba65a000 ba668000 imapi.sys Timestamp: unavailable (00000000) Checksum: 00000000 ImageSize: 0000E000 ba1c4000 ba1d5000 vpc-8042.sys Timestamp: unavailable (00000000) Checksum: 00000000 ImageSize: 00011000 f77df000 f77e7000 Sfloppy.SYS Timestamp: unavailable (00000000) Checksum: 00000000 ImageSize: 00008000 ******************************************************************************* * * * Bugcheck Analysis * * * ******************************************************************************* Use !analyze -v to get detailed debugging information. BugCheck 7E, {c0000005, f723e087, f78dea8c, f78de788} ***** Kernel symbols are WRONG. Please fix symbols to do analysis. --omitted-- Probably caused by : fltmgr.sys ( fltmgr!FltGetIrpName+63f ) Followup: MachineOwner --------- Finished dump check

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• GEM Version Requirements Deprecated

  - by Kevin Sylvestre

  When creating a new Rails project using: rails sample Then creating a model using: script/generate model person first_name:string last_name:string Everything is fine. However, if I add any gems to my environment.rb: config.gem "authlogic" And run the same generator, I get the following: /Library/Ruby/Gems/1.8/gems/rails-2.3.5/lib/rails/gem_dependency.rb:119:Warning: Gem::Dependency#version_requirements is deprecated and will be removed on or after August 2010. The warning just recently appeared (I think), but I would like to fix it if possible. Any hints or similar experiences? Thanks.

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• Looking for how-to use UIGraphicsSetPDFContextURLForRect on iOS or Cocoa

  - by user1676332

  I'm playing to manipulate PDF on iOS (display but also and mostly generation). I wish to embed rectangular areas which act as "external" links (URLs like http://host.tld/path/file). Do you know where I can find an example(s) of how to use the UIGraphicsSetPDFContextURLForRect function? I find absolutly nothing on Internet. If I understand well, the only requirement is that the current graphic context should be PDF "type" and I think I respect this since, upstream, I call UIGraphicsPushContext why my PDF context as parameter (this was anyway required for methods like drawAtPoint: that I use also with success). I do not think it is important but just in case I specify that this DOES NOT take place in the drawRect: of a View subclass. You're quite right to say me unequivocally that I have "all wrong". The graphical environment is so sophisticated and rich in iOS that I assume to have not assimilated more than 1 or 2% for now. Thank you in advance.

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• Albacore msbuild task problem

  - by Dejan

  Just updated albacore to version 0.14 and ran into a major problem. My current environment is: Ruby 1.9.1 Rake 0.8.7 Albacore 0.1.4 The problem is that as of now all my rake build throw a funny little exception: undefined method 'push' for #<Enumerator:0x???????> So far I have traced the problem to albacore msbuild.rb line 38 and 26. To be honest I just don't have a clue why this is happening. As a little help here is the rake task that is turning my hear Grey :) desc "Build solution" msbuild :build => :prepareOutput do |msb| msb.properties :configuration => :Release msb.targets :Clean, :Build msb.solution = "../xxx/xxx/xxx.sln" end

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• Known "Z notation" applications ?

  - by Amadeus45

  I was just remembering back my university classes and was wondering to know if anyone out here even used the "Z notation" in a professional environment. I honestly must say that it was the single most boring class that I have ever attended in my life. Maybe because of the teacher, but at the time we really all thought it was a big waste of time. I might have been wrong, which is why I'd like to hear you about it. If you are using it or some derived language (Z++), I'd just like to know how is it useful for you. Just curious to know some commonly-known applications of Z or your application. For those who are not familiar : http://staff.washington.edu/jon/z/z-examples.html

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• Invalid AuthenticityToken everywhere

  - by bwizzy

  I have a rails app that I just deployed which is generating Invalid AuthenticityToken errors anywhere a form is submitted. The app uses subdomains as account names and will also eventually allow for a custom domain to be entered. I have an entry in production.rb to allow for cross-domain session handling. The problem is that you can't login / or submit any form because everything raises an Invalid AuthenticityToken error. The issue looks similar but not the same as http://stackoverflow.com/questions/1201901/rails-invalid-authenticity-token-after-deploy plus I'm not using mongrel. I've tried clearing cookies in the browser, and restarting passenger but no luck. Anyone have any ideas? The server is running nginx + passenger 2.3.11, and Rails 2.3.5. #production.rb config.action_controller.session[:domain] = '.domain.com' #environment.rb config.action_controller.session = { :session_key => '_app_session', :secret => '.... nums and chars .....' }

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• Rails Unit Testing with MyISAM Tables

  - by tadman

  I've got an application that requires the use of MyISAM on a few tables, but the rest are the traditional InnoDB type. The application itself is not concerned with transactions where it applies to these records, but performance is a concern. The Rails testing environment assumes the engine used is transactional, though, so when the test database is generated from the schema.rb it is imported with the same engine. Is it possible to over-ride this behaviour in a simple manner? I've resorted to an awful hack to ensure the tables are the correct type by appending this to test_helper.rb: (ActiveRecord::Base.connection.select_values("SHOW TABLES") - %w[ schema_info ]).each do |table_name| ActiveRecord::Base.connection.execute("ALTER TABLE `#{table_name}` ENGINE=InnoDB") end Is there a better way to make a MyISAM-backed model be testable?

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• How do you implement caching in Linq to SQL?

  - by Glenn Slaven

  We've just started using LINQ to SQL at work for our DAL & we haven't really come up with a standard for out caching model. Previously we had being using a base 'DAL' class that implemented a cache manager property that all our DAL classes inherited from, but now we don't have that. I'm wondering if anyone has come up with a 'standard' approach to caching LINQ to SQL results? We're working in a web environment (IIS) if that makes a difference. I know this may well end up being a subjective question, but I still think the info would be valuable. EDIT: To clarify, I'm not talking about caching an individual result, I'm after more of an architecture solution, as in how do you set up caching so that all your link methods use the same caching architecture.

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• rubygem "Argument list too long"

  - by mehmermaid

  My problem is that during or after running a process which uses Ruby intensively, when I use any gem command including gem --version or gem install rake, it hangs for just over a minute and then gives me this error: $ gem list /Users/username/.rvm/bin/gem: line 5: /Users/username/.rvm/bin/gem: Argument list too long /Users/username/.rvm/bin/gem: line 5: /Users/username/.rvm/bin/gem: Unknown error: 0 file at : line 5: /Users/username/.rvm/bin/gem #!/usr/bin/env bash if [[ -s "/Users/username/.rvm/environments/ruby-1.8.7-p334" ]] ; then source "/Users/username/.rvm/environments/ruby-1.8.7-p334" exec gem "$@" # this is line 5 else echo "ERROR: Missing RVM environment file: '/Users/username/.rvm/environments/ruby- 1.8.7-p334'" >&2 exit 1 fi The only way that I have found to get this working again is to restart my computer, which is obviously undesirable. I am using OSX 10.6.5 I have spent quite a while trying to find anyone else who has had this problem, and been unsuccessful. Do you have any idea why this might be happening?

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• Trying to execute netdom.exe from a ruby script or IRB does nothing

  - by Joraff

  I'm trying to write a script that will rename a computer and join it to a domain, and was planning to call on netdom.exe to do the dirty work. However, trying to run this utility in the script (same results in irb) does absolutely nothing. No output, no execution. I tried with backticks and with the system() method. System() returns false for everything but system("netdom") (which returns true). Backticks never return anything but an empty string. I have verified that netdom runs and works in the environment the script will be running in, and I'm calling other command-line utilities earlier in the script that work (w32tm, getmac, ping). Here's the exact line that gets executed: `netdom renamecomputer %COMPUTERNAME% /NewName:#{newname} /force` FYI, This is windows 7 x64

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• Jqm is not a function

  - by kris

  Hi all, I'm having some trouble with Jquery and JqModal, and I hope you are able to help, since I've been struggling for hours.. Having a single button element with an onclick action running my method "test" (shown below): $('#picture_form').jqm({ajax: '/test.php'}); $('#picture_form').jqmShow(); This will load the ajax content of test.php into my div element picture_form, shown using JqModal as its supposed to! Though when I close this window, and re-clicks the button I'm getting the error: $("#picture_form").jqm is not a function. As a solution I've tried to use the JqModal trigger function, and this leaves me able to open and close the JqModal windows as many times as I want to. Sadly I can only call the 'trigger' using test environment, in my production code I have to open the JqModal window using a function.. Does anyone have a clue why this 'bug' appears when calling the opening when using a function? Thanks in advance

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• Aging Data Structure in C#

  - by thelsdj

  I want a data structure that will allow querying how many items in last X minutes. An item may just be a simple identifier or a more complex data structure, preferably the timestamp of the item will be in the item, rather than stored outside (as a hash or similar, wouldn't want to have problems with multiple items having same timestamp). So far it seems that with LINQ I could easily filter items with timestamp greater than a given time and aggregate a count. Though I'm hesitant to try to work .NET 3.5 specific stuff into my production environment yet. Are there any other suggestions for a similar data structure? The other part that I'm interested in is aging old data out, If I'm only going to be asking for counts of items less than 6 hours ago I would like anything older than that to be removed from my data structure because this may be a long-running program.

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• Clustering and DB Replication in virtualized (and cloud) environments

  - by devdude

  Both replication and clustering are terms for servers setups with physical (real) servers, usually implemented on a DB or AS level. Now the question: In a virtualized environment with "easy" scalable servers (touching clustering) and a higher availability (DB replication) through the means of high availability of the virtual server by the cloudserver provider, do we really need replication and clustering (as in covering the problems of traditional servers) ? Question is asked from a soultion/application provider viewpoint. Please exclude the need of replication with a business requirement background, eg. the need to replicate a DB at 2 different geographical locations to ensure performance and data. Thanks for your insights !

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• Custom Build Step Paths Between x86 and x64 in Visual Studio

  - by Bob Somers

  For reference, I'm using Visual Studio 2010. I have a custom build step defined as follows: if exist "$(TargetDir)"server.dll copy "$(TargetDir)"server.dll "c:\program files (x86)\myapp\server.dll" This works great on my desktop, which is running 64-bit Windows. However, when I build on my laptop, c:\Program Files (x86)\ doesn't exist because it's running 32-bit Windows. I'd like to put in something that will work between both editions of Windows, since the project files are under version control and it's a real pain to change the paths every time I work on my laptop. If this were a *nix environment I'd just create a symlink and be done with it. Any ideas?

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• SH/BASH - Scan a log file until some text occurs, then exit. How??

  - by James

  Current working environment is OSX 10.4.11. My current script: #!/bin/sh tail -f log.txt | while read line do if echo $line | grep -q 'LOL CANDY'; then echo 'LOL MATCH FOUND' exit 0 fi done It works properly the first time, but on the second run and beyond it takes 2 occurrences of 'LOL CANDY' to appear before the script will exit, for whatever reason. And although I'm not sure it is specifically related, there is the problem of the "tail -f" staying open forever. Can someone please give me an example that will work without using tail -f? If you want you can give me a bash script, as OSX can handle sh, bash, and some other shells I think.

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• Setting up java configurations in eclipse. multiple .param files

  - by Charlie

  I'm going to be using ECJ for doing genetic programming and I haven't touched java in years. I'm working on setting up the eclipse environment and I'm catching a few snags. The ECJ source has several packages, and several sample programs come along with it. I ran one sample program (called tutorial1) by going to the run configurations and adding -file pathToParamsFile to the program arguments. This made it point to the params file of that tutorial and run that sample. In a new example I am testing (from the package gui) there are TWO params files. I tried pointing to just one param file and a program ran in the console, but there was supposed to be a GUI which did not load. I'm not sure what I'm doing wrong. Any help would be greaaatly appreciated.

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• setting mailx default smtp relay

  - by Arthur

  I heave searched Google for this and cannot seem to find a soloution I have bsd-mailx on my server and it sends mail just fine However I wished to have a development environment at home. I need mailx such that php can use its mail function. However the mail is failing to resolve the domain name @gmail.com I am aware that my ISP talk talk may be blocking this is they have a mail server smtp.talktalk.net I assume I would have to add somthing to /etc/mail.rc and use heirloom maEdit turned out I had a instance of send mail running that was doing weird things.. after killing ilx not bsd-mailx,,but would still need to set default smtp relay Im on ubuntu 12.4 thankyou Edit turned out I had a instance of send mail running that was doing weird things.. after killing that, I was able to add the smtp relay, but its now saying that the sender domain does not work. I assume this domain has to route back the the same machine the mail originated from. as i dont have a domain for my home address.

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• side effect gotchas in python/numpy? horror stories and narrow escapes wanted

  - by shabbychef

  I am considering moving from Matlab to Python/numpy for data analysis and numerical simulations. I have used Matlab (and SML-NJ) for years, and am very comfortable in the functional environment without side effects (barring I/O), but am a little reluctant about the side effects in Python. Can people share their favorite gotchas regarding side effects, and if possible, how they got around them? As an example, I was a bit surprised when I tried the following code in Python: lofls = [[]] * 4 #an accident waiting to happen! lofls[0].append(7) #not what I was expecting... print lofls #gives [[7], [7], [7], [7]] #instead, I should have done this (I think) lofls = [[] for x in range(4)] lofls[0].append(7) #only appends to the first list print lofls #gives [[7], [], [], []] thanks in advance

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