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• Are "EXC_BREAKPOINT (SIGTRAP)" exceptions caused by debugging breakpoints?

  - by Dennis

  I have a multithreaded app that is very stable on all my test machines and seems to be stable for almost every one of my users (based on no complaints of crashes). The app crashes frequently for one user, though, who was kind enough to send crash reports. All the crash reports (~10 consecutive reports) look essentially identical: Date/Time: 2010-04-06 11:44:56.106 -0700 OS Version: Mac OS X 10.6.3 (10D573) Report Version: 6 Exception Type: EXC_BREAKPOINT (SIGTRAP) Exception Codes: 0x0000000000000002, 0x0000000000000000 Crashed Thread: 0 Dispatch queue: com.apple.main-thread Thread 0 Crashed: Dispatch queue: com.apple.main-thread 0 com.apple.CoreFoundation 0x90ab98d4 __CFBasicHashRehash + 3348 1 com.apple.CoreFoundation 0x90adf610 CFBasicHashRemoveValue + 1264 2 com.apple.CoreText 0x94e0069c TCFMutableSet::Intersect(__CFSet const*) const + 126 3 com.apple.CoreText 0x94dfe465 TDescriptorSource::CopyMandatoryMatchableRequest(__CFDictionary const*, __CFSet const*) + 115 4 com.apple.CoreText 0x94dfdda6 TDescriptorSource::CopyDescriptorsForRequest(__CFDictionary const*, __CFSet const*, long (*)(void const*, void const*, void*), void*, unsigned long) const + 40 5 com.apple.CoreText 0x94e00377 TDescriptor::CreateMatchingDescriptors(__CFSet const*, unsigned long) const + 135 6 com.apple.AppKit 0x961f5952 __NSFontFactoryWithName + 904 7 com.apple.AppKit 0x961f54f0 +[NSFont fontWithName:size:] + 39 (....more text follows) First, I spent a long time investigating [NSFont fontWithName:size:]. I figured that maybe the user's fonts were screwed up somehow, so that [NSFont fontWithName:size:] was requesting something non-existent and failing for that reason. I added a bunch of code using [[NSFontManager sharedFontManager] availableFontNamesWithTraits:NSItalicFontMask] to check for font availability in advance. Sadly, these changes didn't fix the problem. I've now noticed that I forgot to remove some debugging breakpoints, including _NSLockError, [NSException raise], and objc_exception_throw. However, the app was definitely built using "Release" as the active build configuration. I assume that using the "Release" configuration prevents setting of any breakpoints--but then again I am not sure exactly how breakpoints work or whether the program needs to be run from within gdb for breakpoints to have any effect. My questions are: could my having left the breakpoints set be the cause of the crashes observed by the user? If so, why would the breakpoints cause a problem only for this one user? If not, has anybody else had similar problems with [NSFont fontWithName:size:]? I will probably just try removing the breakpoints and sending back to the user, but I'm not sure how much currency I have left with that user. And I'd like to understand more generally whether leaving the breakpoints set could possibly cause a problem (when the app is built using "Release" configuration).

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• Wierdness debugging Visual Studio C++ 2008

  - by Jeff Dege

  I have a legacy C++ app, that in its most incarnation we've been building with makefiles and VS2003's command-line tool. I'm trying to get it to build using VS2008 and MsBuild. The build is working OK, but I'm getting errors where I'd never seen errors, before, and stepping through in VS2008's debugger only confuses me. The app links a number of static libraries, which fall into two categories: those that are part of the same application suite, and those that are shared between a number of application suites. Originally, I had a .csproj file for each static library, and two .sln files, one for the application suite (including the suite-specific libraries) and one for the non-suite-specific shared libraries. The shared libraries were included in the link, their projects were not included in the application suite .sln. The application instantiates an object from a class that is defined in one of the shared libraries. The class has a member object of a class that wraps a linked list. The constructor of the linked list class sets its "head" pointer to null. When I run the app, and try to add an element to the linked list, I get an error - the head pointer contains the value 0xCCCCCCCC. So I step through with the debugger. And see weirdness. When the current line in the debugger is in a source file belonging to the static library, the head pointer contains 0x00000000. When I step into the constructor, I can see the pointer being set to that value, and when I'm stepped into any other method of the class, I can see that the head pointer still contains 0x00000000. But when I step out into methods that are defined in the application suite .sln, it contains 0xCCCCCCCC. It's not like it's being overwritten. It changes back and forth depending upon which source file I am currently debugging. So I included the shared library's project in the application suite .sln, and now I see the head pointer containing 0xCCCCCCCC all the time. It looks like the constructor of the linked list class is not being called. So now, I'm entirely confused. Anyone have any ideas?

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• Debugging matchit plugin in vim (under Cygwin)

  - by system PAUSE

  The "matchit" plugin for vim is supposed to allow you to use the % key to jump between matching start/end tags when editing HTML, as well as /* and */ comment delimiters when editing other kinds of code. I've followed the exact instructions in ":help matchit", but % still doesn't work for me. It seems silly to ask "Why doesn't this work?" so instead I'm asking How can I diagnose the problem? Pointers to references are welcome, but specific vim-plugin-debugging techniques are preferred. Here is the ~/.vim directory: $ ls -ltaGR ~/.vim /cygdrive/y/.vim: total 0 drwxr-xr-x 1 spause 0 Sep 17 13:20 .. drwxr-xr-x 1 spause 0 Sep 16 13:59 doc drwxr-xr-x 1 spause 0 Sep 16 13:58 . drwxr-xr-x 1 spause 0 Sep 16 13:58 plugin /cygdrive/y/.vim/doc: total 24 -rw-r--r-- 1 spause 1961 Sep 16 13:59 tags drwxr-xr-x 1 spause 0 Sep 16 13:59 . -rw-r--r-- 1 spause 19303 Sep 16 13:58 matchit.txt drwxr-xr-x 1 spause 0 Sep 16 13:58 .. /cygdrive/y/.vim/plugin: total 32 drwxr-xr-x 1 spause 0 Sep 16 13:58 .. -rw-r--r-- 1 spause 30714 Sep 16 13:58 matchit.vim drwxr-xr-x 1 spause 0 Sep 16 13:58 . I am running vim 7.2 under Cygwin (installed Fall 2008). cygcheck shows: 1829k 2008/06/12 C:\cygwin\bin\cygwin1.dll Cygwin DLL version info: DLL version: 1.5.25 DLL epoch: 19 DLL bad signal mask: 19005 DLL old termios: 5 DLL malloc env: 28 API major: 0 API minor: 156 Shared data: 4 DLL identifier: cygwin1 Mount registry: 2 Cygnus registry name: Cygnus Solutions Cygwin registry name: Cygwin Program options name: Program Options Cygwin mount registry name: mounts v2 Cygdrive flags: cygdrive flags Cygdrive prefix: cygdrive prefix Cygdrive default prefix: Build date: Thu Jun 12 19:34:46 CEST 2008 CVS tag: cr-0x5f1 Shared id: cygwin1S4 In vim, :set shows: --- Options --- autoindent fileformat=dos shiftwidth=3 background=dark filetype=html syntax=html cedit=^F scroll=24 tabstop=3 expandtab shelltemp textmode viminfo='20,<50,s10,h Notably, the syntax and filetype are both recognized as HTML. (The syntax colouring is just fine.) If additional info is needed, please comment. UPDATE: Per answer by too much php: After trying vim -V1, I had changed my .vimrc to include a line set nocp so the compatible option is not on. :let loadad_matchit loaded_matchit #1 :set runtimepath? runtimepath=~/.vim,/usr/share/vim/vimfiles,/usr/share/vim/vim72,/usr/share/vim/vimfiles/after,~/.vim/after (~ is /cygdrive/y) Per answer by michael: :scriptnames 1: /cygdrive/y/.vimrc 2: /usr/share/vim/vim72/syntax/syntax.vim 3: /usr/share/vim/vim72/syntax/synload.vim 4: /usr/share/vim/vim72/syntax/syncolor.vim 5: /usr/share/vim/vim72/filetype.vim 6: /usr/share/vim/vim72/colors/evening.vim 7: /cygdrive/y/.vim/plugin/matchit.vim 8: /cygdrive/y/.vim/plugin/python_match.vim 9: /usr/share/vim/vim72/plugin/getscriptPlugin.vim 10: /usr/share/vim/vim72/plugin/gzip.vim 11: /usr/share/vim/vim72/plugin/matchparen.vim 12: /usr/share/vim/vim72/plugin/netrwPlugin.vim 13: /usr/share/vim/vim72/plugin/rrhelper.vim 14: /usr/share/vim/vim72/plugin/spellfile.vim 15: /usr/share/vim/vim72/plugin/tarPlugin.vim 16: /usr/share/vim/vim72/plugin/tohtml.vim 17: /usr/share/vim/vim72/plugin/vimballPlugin.vim 18: /usr/share/vim/vim72/plugin/zipPlugin.vim 19: /usr/share/vim/vim72/syntax/html.vim 20: /usr/share/vim/vim72/syntax/javascript.vim 21: /usr/share/vim/vim72/syntax/vb.vim 22: /usr/share/vim/vim72/syntax/css.vim Note that matchit.vim, html.vim, tohtml.vim, css.vim, and javascript.vim are all present. :echo b:match_words E121: Undefined variable: b:match_words E15: Invalid expression: b:match_words Hm, this looks highly relevant. I'm now looking through :help matchit-debug to find out how to fix b:match_words.

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• How can I improve my skills while working on actual projects, in the absence of more experienced developers?

  - by LolCoder

  I'm the lead developer at a small company, working with C# and ASP.Net. Our team is small, 2-3 people, without much experience in development and design. I don't have the opportunity to learn from more senior developers, there is no one in my team to guide me and help me choose the best approaches, as I take care most of the projects myself. How can I improve my software development skills while working on actual projects, in the absence of more experienced developers?

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• How to improve UI development skills (for a Java developer)?

  - by bluetech

  I have worked on backend development with mostly Java. For past 6 months I have been working on UI a lot and I want to improve my skills. I am aware of HTML, CSS and JavaScript (also jQuery and YUI) but I have never been able to master them so that I can develop efficient and maintainable solutions much quicker than how I do now. Can other UI developers give me any tips/resources? I also wanted to learn about patterns and best practices for UI development.

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• Debugging cucumber/gem dependencies

  - by mobmad

  How do you debug and fix gem errors like below? Although the below case is very specific, I'm also looking for solution to related problems like "gem already activated [...]", and resources to gem management/debugging. mycomputer:projectfolder username$ cucumber features Using the default profile... WARNING: No DRb server is running. Running features locally: /Users/username/.gem/ruby/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. Use #requirement can't activate , already activated ruby-hmac-0.4.0 (Gem::Exception) /Users/username/.gem/ruby/1.8/gems/rails-2.3.5/lib/rails/gem_dependency.rb:101:in `specification' /Users/username/.gem/ruby/1.8/gems/rails-2.3.5/lib/rails/plugin/locator.rb:81:in `plugins' /Library/Ruby/Site/1.8/rubygems/custom_require.rb:31:in `inject' /Users/username/.gem/ruby/1.8/gems/rails-2.3.5/lib/rails/plugin/locator.rb:81:in `each' /Users/username/.gem/ruby/1.8/gems/rails-2.3.5/lib/rails/plugin/locator.rb:81:in `inject' /Users/username/.gem/ruby/1.8/gems/rails-2.3.5/lib/rails/plugin/locator.rb:81:in `plugins' /Users/username/.gem/ruby/1.8/gems/rails-2.3.5/lib/rails/plugin/loader.rb:109:in `locate_plugins' /Users/username/.gem/ruby/1.8/gems/rails-2.3.5/lib/rails/plugin/loader.rb:108:in `map' /Users/username/.gem/ruby/1.8/gems/rails-2.3.5/lib/rails/plugin/loader.rb:108:in `locate_plugins' /Users/username/.gem/ruby/1.8/gems/rails-2.3.5/lib/rails/plugin/loader.rb:32:in `all_plugins' /Users/username/.gem/ruby/1.8/gems/rails-2.3.5/lib/rails/plugin/loader.rb:22:in `plugins' /Users/username/.gem/ruby/1.8/gems/rails-2.3.5/lib/rails/plugin/loader.rb:53:in `add_plugin_load_paths' /Users/username/.gem/ruby/1.8/gems/rails-2.3.5/lib/initializer.rb:294:in `add_plugin_load_paths' /Users/username/.gem/ruby/1.8/gems/rails-2.3.5/lib/initializer.rb:136:in `process' /Users/username/.gem/ruby/1.8/gems/rails-2.3.5/lib/initializer.rb:113:in `send' /Users/username/.gem/ruby/1.8/gems/rails-2.3.5/lib/initializer.rb:113:in `run' /Users/username/Documents/projectfolder.0/sites/projectfolder/config/environment.rb:9 /Library/Ruby/Site/1.8/rubygems/custom_require.rb:31:in `gem_original_require' /Library/Ruby/Site/1.8/rubygems/custom_require.rb:31:in `polyglot_original_require' /Library/Ruby/Gems/1.8/gems/polyglot-0.2.9/lib/polyglot.rb:70:in `require' ./features/support/env.rb:12 /Library/Ruby/Gems/1.8/gems/spork-0.7.5/lib/spork.rb:23:in `prefork' ./features/support/env.rb:9 /Library/Ruby/Site/1.8/rubygems/custom_require.rb:31:in `gem_original_require' /Library/Ruby/Site/1.8/rubygems/custom_require.rb:31:in `polyglot_original_require' /Library/Ruby/Gems/1.8/gems/polyglot-0.2.9/lib/polyglot.rb:70:in `require' /Library/Ruby/Gems/1.8/gems/cucumber-0.4.4/bin/../lib/cucumber/rb_support/rb_language.rb:124:in `load_code_file' /Library/Ruby/Gems/1.8/gems/cucumber-0.4.4/bin/../lib/cucumber/step_mother.rb:84:in `load_code_file' /Library/Ruby/Gems/1.8/gems/cucumber-0.4.4/bin/../lib/cucumber/step_mother.rb:76:in `load_code_files' /Library/Ruby/Gems/1.8/gems/cucumber-0.4.4/bin/../lib/cucumber/step_mother.rb:75:in `each' /Library/Ruby/Gems/1.8/gems/cucumber-0.4.4/bin/../lib/cucumber/step_mother.rb:75:in `load_code_files' /Library/Ruby/Gems/1.8/gems/cucumber-0.4.4/bin/../lib/cucumber/cli/main.rb:47:in `execute!' /Library/Ruby/Gems/1.8/gems/cucumber-0.4.4/bin/../lib/cucumber/cli/main.rb:24:in `execute' /Library/Ruby/Gems/1.8/gems/cucumber-0.4.4/bin/cucumber:8 /usr/bin/cucumber:19:in `load' /usr/bin/cucumber:19 And this is the output from gem list actionmailer (2.3.5, 2.2.2, 1.3.6) actionpack (2.3.5, 2.2.2, 1.13.6) actionwebservice (1.2.6) activerecord (2.3.5, 2.2.2, 1.15.6) activeresource (2.3.5, 2.2.2) activesupport (2.3.5, 2.2.2, 1.4.4) acts_as_ferret (0.4.4, 0.4.3) adamwiggins-rest-client (1.0.4) aslakhellesoy-webrat (0.4.4.1) aslakjo-comatose (2.0.5.12) authlogic (2.1.3) authlogic-oid (1.0.4) builder (2.1.2) capistrano (2.5.17, 2.5.2) cgi_multipart_eof_fix (2.5.0) configuration (1.1.0) cucumber (0.4.4) cucumber-rails (0.3.0) daemons (1.0.10) database_cleaner (0.5.0) diff-lcs (1.1.2) dnssd (1.3.1, 0.6.0) fakeweb (1.2.8) fastthread (1.0.7, 1.0.1) fcgi (0.8.8, 0.8.7) ferret (0.11.6) gem_plugin (0.2.3) gemcutter (0.4.1) heroku (1.8.0) highline (1.5.2, 1.5.0) hoe (2.5.0) hpricot (0.8.2, 0.6.164) json (1.2.2) json_pure (1.2.2) launchy (0.3.5) libxml-ruby (1.1.3, 1.1.2) linecache (0.43) log4r (1.1.5) mime-types (1.16) mongrel (1.1.5) mysql (2.8.1) needle (1.3.0) net-scp (1.0.2, 1.0.1) net-sftp (2.0.4, 2.0.1, 1.1.1) net-ssh (2.0.20, 2.0.4, 1.1.4) net-ssh-gateway (1.0.1, 1.0.0) nifty-generators (0.3.2) nokogiri (1.4.1) oauth (0.3.6) oniguruma (1.1.0) plist (3.1.0) polyglot (0.2.9) rack (1.1.0, 1.0.1) rack-test (0.5.3) rails (2.3.5, 2.2.2, 1.2.6) rake (0.8.7, 0.8.3) RedCloth (4.2.2, 4.1.1) rest-client (1.4.0) rspec (1.3.0) rspec-rails (1.3.2) ruby-activeldap (0.8.3.1) ruby-debug-base (0.10.3) ruby-debug-ide (0.4.9) ruby-hmac (0.4.0) ruby-net-ldap (0.0.4) ruby-openid (2.1.7, 2.1.2) ruby-yadis (0.3.4) rubyforge (2.0.4) rubygems-update (1.3.6) rubynode (0.1.5) rubyzip (0.9.4) sanitize (1.2.0) sequel (3.0.0) sinatra (0.9.2) spork (0.7.5) sqlite3-ruby (1.2.5, 1.2.4) taps (0.2.26) term-ansicolor (1.0.4) termios (0.9.4) textpow (0.10.1) thor (0.9.9) treetop (1.4.2) twitter4r (0.3.2, 0.3.1) ultraviolet (0.10.2) webrat (0.7.0) will_paginate (2.3.12) xmpp4r (0.5, 0.4)

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• Can't step into stored procedure on remote SQL Server 2008

  - by abatishchev

  I have a domain installed on virtual Windows Server 2008 x64. SQL Server 2008 Express x64 is running in Windows Server 2008 x64 and client on Windows 7 RTM x86. Both are into the domain. I'm starting both Visual Studio 2008 and SQL Server Management Studio 2008 under domain admin user. This account is a member of group sysadmin on SQL Server. Server has firewall exceptions for both TCP and UDP on ports 135-139 and 1433-1434. Visual Studio 2008 Remote debugger services is started on server and Domain Admins group is allowed to debug, When I'm starting debugging of a query in SMS I'm getting this error: Failed to start debugger Error HRESULT E_FAIL has been returned from a call to a COM component. (mscorlib) Program Location: at System.Runtime.InteropServices.Marshal.ThrowExceptionForHRInternal(Int32 errorCode, IntPtr errorInfo) at Microsoft.SqlServer.Management.UI.VSIntegration.DebugSession.DebugCallbacks.OnSqlInitializeDebuggingEvent(ISqlInitializeDebuggingEvent sqlInitializeDebuggingEvent) at Microsoft.SqlServer.Management.UI.VSIntegration.DebugSession.DebugCallbacks.Microsoft.VisualStudio.Debugger.Interop.IDebugEventCallback2.Event(IDebugEngine2 debugEngine, IDebugProcess2 debugProcess, IDebugProgram2 debugProgram, IDebugThread2 debugThread, IDebugEvent2 debugEvent, Guid& riidEvent, UInt32 attribute) and Unable to access the SQL Server debugging interface. The Visual Studio debugger cannot connect to the remote computer. A firewall may be preventing communication via DCOM to the remote computer. Please see Help for assistance. and Unable to start program MSSSQL://server.mydomain.local/master/sys/=0 And when stepping-in into a stored procedure using VS I'm getting the first one and this: Exception from HRESULT: 0x89710016 What have I do?

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• -[CFString length]: message sent to deallocated instance 0x3881940 when i scroll to near the bottom

  - by James

  Hey guys, i've got a problem debugging an iphone app that i'm attempting to write and it's got me stumped, bear with me, i'm a n00b to programming and might get some of the terminology wrong but i'll try to explain it as best as i can. The app gets an XML doc from the a web site, parses it into an array, and then displays it in a table view, i have the parser in a separate file. The ViewDidLoad in RootViewController sends it a url, the parser goes to work and then returns an NSMutableArray. When i run the app it works fine with small XML files (5 entries or so, and 1-3 sections), but when i use a larger one(20+ rows, over 12 sections) i get the error "-[CFString length]: message sent to deallocated instance 0x3881940" when i scroll near the bottom of the tableview, just as the last section title is about to come onto the viewable area on the screen to be precise. if i return a static string instead of the object in my array in this method it doesn't crash, but i can use NSLog to call the array and it returns the title no problems. - (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)indexPath { return [[returnedEvents objectAtIndex:indexPath ] objectAtIndex:0]; } The returnedEvents array isn't released until -(void) dealloc {} I have read a few other posts on here, and a few guides on debugging and as of yet am unable to find anything that was able to help me, i'd be more than happy to post some code up here and any more information, i'm just not sure where to start... Thanks in advance for anyone willing to have a go at helping me out.

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• nedmalloc: where does mem<fm come from?

  - by Suma

  While implementing nedmalloc into my application, I am frequently hitting a situation when nedmalloc refuses to free a block of memory, claiming it did not allocate it. While debugging I have come up to the point I see a particular condition which is failing, all other (including magic numbers) succeed. The condition is this: if((size_t)mem-(size_t)fm>=(size_t)1<<(SIZE_T_BITSIZE-1)) return 0; On Win32 this seems to be equivalent to: if((int)((size_t)mem-(size_t)fm)<0) return 0; Which seems to be the same as: if((size_t)mem<(size_t)fm) return 0; In my case I really see mem < fm. What I do not understand now is, where does this condition come from. I cannot find anything which would guarantee the fm <= m anywhere in code. Yet, "select isn't broken": I doubt it would really be a bug in nedmalloc, most likely I am doing something wrong somewhere, but I cannot find it. Once I turn debugging features of nedmalloc on, the problem goes away. If someone here understands inner working of nedmalloc, could you please explain to me why is fm <= m?

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• Viewing namespaced global variables in Visual Studio debugger?

  - by Chris

  When debugging a non-managed C++ project in Visual Studio 2008, I occasionally want to see the value of a global variable. We don't have a lot of these but those that are there all declared within a namespace called 'global'. e.g. namespace global { int foo; bool bar; ... } The problem is that when the code is stopped at a breakpoint, the default debugging tooltip (from pointing at the variable name) and quickwatch (shift-f9 on the variable name) don't take the namespace into consideration and hence won't work. So for example I can point at 'foo' and nothing comes up. If I shift-f9 on foo, it will bring up the quickwatch, which then says 'CXX0017: Error: symbol "foo" not found'. I can get around that by manually editing the variable name in the quickwatch window to prefix it with "global::" (which is cumbersome considering you have to do it each time you want to quickwatch), but there is no fix for the tooltip that I can work out. Setting the 'default namespace' of the project properties doesn't help. How can I tell the VS debugger to use the namespace that it already knows the variable is declared in (since it has the declaration right there), or, alternatively, tell it a default namespace to look for variables in if it doesn't find them? My google-fu has failed to find an answer. This report lists the same problem, with MS saying it's "by design", but even so I am hoping there is some way to work around it (perhaps with clever use of autoexp.dat?)

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• How to debug into my apache module built using a Makefile?

  - by AJ

  Firstly, I come from Windows-VisualStudio-C++ background. Now I am developing in a Ubuntu environment. With the help of a Makefile, I built a mymodule.so and copied it to the modules folder within apache. Now, it appears that the module is working fine. But I would like to debug into this module to understand it better. So, first, is there any way I can get something similar to the Visual Studio debugger type of feel while debugging this module? Now, i read that i can use gdb to debug into apache modules, can somebody tell me in detail how this is done or point me to some resource that does it. Ideally, i would like to single step and stuff. I am trying Code::Blocks IDE which has some debugging support. Using the IDE and custom make file, I build the module. Copied it to module location, but how do i debug. How do i hook to the apache process. Should I use Attach to Process. I tried that with the pid of httpd, but with no success. Also, while building is there some flag that i should set so that the .so file is debuggable? I am pretty basic with Linux because i come from windows programming background. Kindly suggest how I go about this. Thanks in advance, Arjun

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• Using unset member variables within a class or struct

  - by Doug Kavendek

  It's pretty nice to catch some really obvious errors when using unset local variables or when accessing a class or struct's members directly prior to initializing them. In visual studio 2008 you get an "uninitialized local variable used" warning at compile-time and get a run-time check failure at the point of access when debugging. However, if you access an uninitialized struct's member variable through one of its functions, you don't get any warnings or assertions. Obviously the easiest solution is don't do that, but nobody's perfect. For example: struct Test { float GetMember() const { return member; } float member; }; Test test; float f1 = test.member; // Raises warning, asserts in VS debugger at runtime float f2 = test.GetMember(); // No problem, just keeps on going This surprised me, but it makes some sense -- the compiler can't assume calling a function on an unused struct is an error, or how else would you initialize or construct it? And anything fancier just quickly brings up so many other complications that it makes sense that it wouldn't bother classifying which functions are ok to call and when, especially just as a debugging help. I know I can set up my own assertions or error checking within the class itself, but that can complicate some simpler structs. Still, it would seem like within the context of the function call, wouldn't it know insides GetMember() that member wasn't initialized yet? I'm assuming it's not only relying on static compile-time deduction, given the Run-Time Check Failure #3 it raises during execution, so based on my current understanding of it it would seem reasonable for the same checks to apply. Is this just a limitation of this specific compiler/debugger (Visual Studio 2008), or more tied to how C++ works?

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• Debugged Program Window Won't Close

  - by Marc Bernier

  Hi, I'm using VS 2008 on a 64-bit XP machine. I'm debugging a 32-bit C++ DLL via a console program. The DLL and EXE projects are contained in the same SLN so that I can modify the DLL as I test. What happens is that every once in a while I kill the program with Debug | Stop Debugging (Shift-F5). VS stops the program, but the console window stays open! If I'm sitting at a breakpoint and hit Shift-F5, it will terminate properly, but if the program is running full-tilt when I stop it, I often see this instead. The big problem is that I can't close these zombie windows. Using End Task in Task Manager does nothing (no message, no nothing). When I shut down the machine, it is unable to due to the orphans and I have to resort to actually turning off the power. I think this is connected to having the DLL and EXE project in the same SLN, as for months I worked on this project in 2 VS instances, one for the DLL and the other for the EXE. I would continually jump back and forth between the windows as I worked. This problem never happened until I put the two projects into a single SLN. The single SLN works a lot better, but this anomaly is very irritating. Any ideas anyone? UPDATE After a bit of searching (here), I found that it appears to have to do with one of the updates from last Tuesday (KB977165 or KB978037). Thank you Microsoft for your excellent pre-release testing.

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• Why are a visual studio project's command-line settings stored per user? Is it OK to check-in (and

  - by DanO

  We're creating an application that understands some command-line parameters. There are some default's we would like to supply on the command-line when debugging, and these are easily set in the project settings as explained here. The thing is visual studio stores these settings in a *.csproj.user file, and the default settings for integrated source control do not check-in *.user files. We would like to just have these default command-line parameters in everyone's IDE when debugging this project. Often (but not always) when visual studio guides you into doing things a certain way it is for good reason. We probably don't want to just check-in someone's .csproj.user file... right? This question is has a few parts: Why does Visual Studio store this particular setting per user? Is there a way to alter this behavior? - Would doing so bring bad juju? Under these circumstances is it OK to check-in and share a .user file? Is there a better way to accomplish what we are trying to do here? Thank you -

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• What are the most important Professional Development opportunities for you

  - by Dmitriy Nagirnyak

  Hi, Have been thinking about what professional development opportunities are important for me to work in a company. Some of them are: Professional surrounding by people with different skills. Ability and support for professional growth. Paid and free courses. Best tools for the job (partially related). Ability and support for trying out new technologies. What are yours? Cheers, Dmitriy.

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• Any netbeans features that will make my day?

  - by Kris

  Hi all, I've recently gotten quite fond of netbeans for my php work because of the XDebug integration. It has made me all but forget about textmate (which imho still beats netbeans for the little things) What do you think is the one awesome netbeans feature I should know about, and more importantly why and how do I use it? I'm asking this to optimize my skills in the use of the IDE and based on the idea that what works well for others might just work for me (and hopefully others).

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• How to troubleshoot an unresponsive Java application/process in Linux

  - by Sasha

  Say your application is unresponsive and you cannot attach a debugger to it, as it rejects everything. All you have is a Linux Bash and process id. How would you investigate the issue? What tools would you use? My goal is to better my troubleshooting skills using Java. This particular issue we had in production, on customer site.

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• IIS mystery: "Deadlock detected" periodically makes site unavailable

  - by jskunkle

  A few times a day, our vb.net (IIS 6.0) website is randomly throwing the following error and becomes completely unavailable for 5-15 minutes at a time while the application is recycled: ISAPI 'c:\windows\microsoft.net\framework\v2.0.50727\aspnet_isapi.dll' reported itself as unhealthy for the following reason: 'Deadlock detected'. The website ran for months on the exact same server in beta without problem - but the problem started over the weekend when we made the site live. The live site is under some load but less than many of our other production websites. How should I attack this problem? I've looked into orphaning the worker process and creating a dump file - but I'm not sure how to analyze that. Any advice or information is appreciated. Thanks, Shane

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• Crash dump analysis

  - by Ryan Ries

  I hope this isn't a stupid question, and if it is, then I want to at least get it over with so I don't feel so dumb in the future. Here we are, loading up a Windows crash dump with Windbg. Here are the first few lines of the debugger output: 0: kd> .dumpdebug ----- 64 bit Kernel Summary Dump Analysis DUMP_HEADER64: MajorVersion 0000000f MinorVersion 00001db1 ... The MinorVersion I mostly understand. It's hexadecimal and it translates to 7601 in decimal. Windows admins would already be able to tell from that that this must be either a Win7 x64 machine or a 2k8 R2 machine with SP1. But isn't 7601 the build number? It's supposed to be Major.Minor.Build/Revision... right? Also I don't understand the MajorVersion. It should be 6. This version of Windows is 6. But isn't 0000000f in hexadecimal 15 in decimal? The full version string of this version of Windows, when you launch the Command Prompt for instance, is 6.1.7601. If 7601 is the MinorVersion, then what is 1 and what is 6? And why does the crash dump say 0F?

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• centos 6 debuginfo repository does not have httpd debug version available

  - by Zippy Zeppoli

  I am trying to get the debug version of httpd so I can use it in conjunction with gdb. I am having a hard time getting them, and they don't seem to be in the standard epel-debuginfo repository. What should I do? > [root@buildbox-rhel6 ~]# debuginfo-install httpd Loaded plugins: fastestmirror, presto enabling epel-debuginfo Loading mirror speeds from cached hostfile epel-debuginfo/metalink | 8.3 kB 00:00 * base: mirrors.cicku.me * epel: mirrors.kernel.org * epel-debuginfo: mirrors.kernel.org * extras: mirrors.arpnetworks.com * updates: linux.mirrors.es.net epel-debuginfo | 3.1 kB 00:00 epel-debuginfo/primary_db | 487 kB 00:01 Checking for new repos for mirrors Could not find debuginfo for main pkg: httpd-2.2.15-15.el6.centos.1.x86_64 Could not find debuginfo pkg for dependency package apr-1.3.9-5.el6_2.x86_64 Could not find debuginfo pkg for dependency package apr-util-1.3.9-3.el6_0.1.x86_64 Could not find debuginfo pkg for dependency package glibc-2.12-1.80.el6_3.6.x86_64 Could not find debuginfo pkg for dependency package glibc-2.12-1.80.el6_3.6.x86_64 Could not find debuginfo pkg for dependency package glibc-2.12-1.80.el6_3.6.x86_64 Could not find debuginfo pkg for dependency package glibc-2.12-1.80.el6_3.6.x86_64 Could not find debuginfo pkg for dependency package glibc-2.12-1.80.el6_3.6.x86_64 Could not find debuginfo pkg for dependency package glibc-2.12-1.80.el6_3.6.x86_64 Could not find debuginfo pkg for dependency package db4-4.7.25-17.el6.x86_64 Could not find debuginfo pkg for dependency package expat-2.0.1-11.el6_2.x86_64 Could not find debuginfo pkg for dependency package openldap-2.4.23-26.el6_3.2.x86_64 Could not find debuginfo pkg for dependency package openldap-2.4.23-26.el6_3.2.x86_64 Could not find debuginfo pkg for dependency package glibc-2.12-1.80.el6_3.6.x86_64 Could not find debuginfo pkg for dependency package pcre-7.8-4.el6.x86_64 Could not find debuginfo pkg for dependency package glibc-2.12-1.80.el6_3.6.x86_64 Could not find debuginfo pkg for dependency package glibc-2.12-1.80.el6_3.6.x86_64 Could not find debuginfo pkg for dependency package libselinux-2.0.94-5.3.el6.x86_64 Could not find debuginfo pkg for dependency package zlib-1.2.3-27.el6.x86_64 No debuginfo packages available to install

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• How can I view a .evt file saved with the Event viewer of another computer?

  - by Adolfo G.U.

  I have a .evt file saved with the EventViewer of another computer. I think I can use my computer's EventViewer as long as I have the same version of the OS. Are there any other alternatives?

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• [Zend Debugger] Cannot receive start command

  - by tharkun

  Hi I have a WAMP install (Apache 2.2.3, PHP 5.2.8) with a working Zend Optimizer. As soon as I add the php.ini lines for Zend Debugger: [Zend Debugger] zend_extension_manager.debug_server_ts="C:\zenddebugger" zend_debugger.allow_hosts=127.0.0.1/32, 192.168.0.0/16, 192.168.1.0/255 zend_debugger.expose_remotely=always and restart apache, I get a blank page and the following entry in the apache error log. [Zend Debugger] Cannot receive start command [Zend Debugger] Cannot send message Now the incredible thing is that I had it working this morning and now, after reinstalling WAMP there is no way I can get it work again. php.ini is exactly the same as it was before. I would be extremely glad to get help, I'm trying to get a working server environment going for over a month, can you believe that? I tried XAMPP, Zend Server and now WAMP and I'm going crazy slowly but surely.

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• Apache 403 after configuring varnish

  - by w0rldart

  I just don't know where else to look and what else to do. I keep getting a 403 error on all my vhosts after setting varnish 3.0 Apacher log: [error] [client 127.0.0.1] client denied by server configuration: /etc/apache2/htdocs Headers: http://domain.com/ GET / HTTP/1.1 Host: domain.com User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:16.0) Gecko/20100101 Firefox/16.0 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 Accept-Language: en-US,en;q=0.5 Accept-Encoding: gzip, deflate DNT: 1 Connection: keep-alive Cookie: __utma=106762181.277908140.1348005089.1354040972.1354058508.6; __utmz=106762181.1348005089.1.1.utmcsr=OTHERDOMAIN.com|utmccn=(referral)|utmcmd=referral|utmcct=/galerias/cocinas Cache-Control: max-age=0 HTTP/1.1 403 Forbidden Vary: Accept-Encoding Content-Encoding: gzip Content-Type: text/html; charset=iso-8859-1 X-Cacheable: YES Content-Length: 223 Accept-Ranges: bytes Date: Sat, 01 Dec 2012 20:35:14 GMT X-Varnish: 1030961813 1030961811 Age: 26 Via: 1.1 varnish Connection: keep-alive X-Cache: HIT ---------------------------------------------------------- /etc/default/varnish: DAEMON_OPTS="-a ip.ip.ip.ip:80 \ -T localhost:6082 \ -f /etc/varnish/main.domain.vcl \ -S /etc/varnish/secret \ -s file,/var/lib/varnish/$INSTANCE/varnish_storage.bin,1G" #-s malloc,256m" My vcl file: http://pastebin.com/axJ57kD8 So, any ideas what I could be missing? Update Just so you know, ports: NameVirtualHost *:8000 Listen 8000 and <VirtualHost 205.13.12.12:8000>

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• Visual Studio 2008 Debugger really slow with SSD

  - by Doug

  Hey guys, my setup is a laptop with Win 7 64bit, VS2008 SP1 on an intel x25-m 4gb RAM with page file turned off (no need) and 2.2 core duo What happens is weird: When i build my project and attach the debugger the symbols load REALLY slowly... like 1 every 5 secs Sometimes the symbols will fail to load at all. This is driving me crazy as this was a freshly installed win 7 box with default VS installation, working on ASP.net web applications... i've never had to use symbol servers or any of that jazz so i'm quite frustrated. With this SSD it should breath fire as it does with loading and doing everything else. Am i missing something?

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• mysqld-nt.exe exist in task list, but actually it's not running?

  - by PHP

  mysqld-nt.exe is showing in the task manager, but I cannot connect to it. I tried: telnet localhost 3306 And it fails to connect. So I restarted the server,and it's ok. This happens every day. Any ideas? EDIT Here is the error log(I didn't find anything abnormal though): 100122 10:11:16 [Note] D:\MySQL\MySQL Server 5.0\bin\mysqld-nt: Normal shutdown 100122 10:11:16 InnoDB: Starting shutdown... 100122 10:11:18 InnoDB: Shutdown completed; log sequence number 0 22939338 100122 10:11:18 [Note] D:\MySQL\MySQL Server 5.0\bin\mysqld-nt: Shutdown complete 100122 10:12:40 InnoDB: Started; log sequence number 0 22939338 100122 10:12:42 [Note] D:\MySQL\MySQL Server 5.0\bin\mysqld-nt: ready for connections. Version: '5.0.24-community-nt' socket: '' port: 3306 MySQL Community Edition (GPL) 100123 16:20:44 [Note] D:\MySQL\MySQL Server 5.0\bin\mysqld-nt: Normal shutdown 100123 16:20:44 InnoDB: Starting shutdown... 100123 16:20:46 InnoDB: Shutdown completed; log sequence number 0 22939832 100123 16:20:46 [Note] D:\MySQL\MySQL Server 5.0\bin\mysqld-nt: Shutdown complete 100123 16:22:09 InnoDB: Started; log sequence number 0 22939832 100123 16:22:11 [Note] D:\MySQL\MySQL Server 5.0\bin\mysqld-nt: ready for connections. Version: '5.0.24-community-nt' socket: '' port: 3306 MySQL Community Edition (GPL) 100125 9:18:59 [Note] D:\MySQL\MySQL Server 5.0\bin\mysqld-nt: Normal shutdown 100125 9:18:59 InnoDB: Starting shutdown... 100125 9:19:00 InnoDB: Shutdown completed; log sequence number 0 22941001 100125 9:19:00 [Note] D:\MySQL\MySQL Server 5.0\bin\mysqld-nt: Shutdown complete 100125 9:20:22 InnoDB: Started; log sequence number 0 22941001 100125 9:20:25 [Note] D:\MySQL\MySQL Server 5.0\bin\mysqld-nt: ready for connections. Version: '5.0.24-community-nt' socket: '' port: 3306 MySQL Community Edition (GPL)

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