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• Hopping from a C++ to a Perl Unix profile?

  - by rocknroll

  Hi all, I have been a C++,Linux Developer till now and I am adept in this stack. Off late I have been getting opportunities that require Perl,Unix (with knowledge of C++,shell scripting) expertise. Organisations are showing interest even thought I don't have much scripting experience to boast off. The roll is more in a Support,maintenance project involving SQL as well. Off late I am in a fix whether to forgo these offers or not. I don't know the dynamics of an IT organisation and thus on one hand I fear that my C++ experience will be nullified and on the positive side I am getting to work on a new technology stack which will only add to my skill set. I am sure, most of you at some point of time have encountered such dilemmas and would have taken some decision. I want you to share your perspectives on such a scenario where a person is required to change his/her technology stack when changing his/her job. What are the merits and demerits in going with either of the choices? Also I know that C++ isn't going anywhere in the near future. What about perl? I have no clue as to what the future holds for perl developer? Whether there are enough opportunities for a perl developer? I am asking this question here because most of my fellow programmers face this career choice dilemma. Thanks.

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• How to get a debug flow of execution in C++

  - by Rich

  Hi, I work on a global trading system which supports many users. Each user can book,amend,edit,delete trades. The system is regulated by a central deal capture service. The deal capture service informs all the user of any updates that occur. The problem comes when we have crashes, as the production environment is impossible to re-create on a test system, I have to rely on crash dumps and log files. However this doesn't tell me what the user has been doing. I'd like a system that would (at the time of crashing) dump out a history of what the user has been doing. Anything that I add has to go into the live environment so it can't impact performance too much. Ideas wise I was thinking of a MACRO at the top of each function which acted like a stack trace (only I could supply additional user information, like trade id's, user dialog choices, etc ..) The system would record stack traces (on a per thread basis) and keep a history in a cyclic buffer (varying in size, depending on how much history you wanted to capture). Then on crash, I could dump this history stack. I'd really like to hear if anyone has a better solution, or if anyone knows of an existing framework? Thanks Rich

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• Questions regarding detouring by modifying the virtual table

  - by Elliott Darfink

  I've been practicing detours using the same approach as Microsoft Detours (replace the first five bytes with a jmp and an address). More recently I've been reading about detouring by modifying the virtual table. I would appreciate if someone could shed some light on the subject by mentioning a few pros and cons with this method compared to the one previously mentioned! I'd also like to ask about patched vtables and objects on the stack. Consider the following situation: // Class definition struct Foo { virtual void Call(void) { std::cout << "FooCall\n"; } }; // If it's GCC, 'this' is passed as the first parameter void MyCall(Foo * object) { std::cout << "MyCall\n"; } // In some function Foo * foo = new Foo; // Allocated on the heap Foo foo2; // Created on the stack // Arguments: void ** vtable, uint offset, void * replacement PatchVTable(*reinterpret_cast<void***>(foo), 0, MyCall); // Call the methods foo->Call(); // Outputs: 'MyCall' foo2.Call(); // Outputs: 'FooCall' In this case foo->Call() would end up calling MyCall(Foo * object) whilst foo2.Call() call the original function (i.e Foo::Call(void) method). This is because the compiler will try to decide any virtual calls during compile time if possible (correct me if I'm wrong). Does that mean it does not matter if you patch the virtual table or not, as long as you use objects on the stack (not heap allocated)?

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• Can this line of code really throw an IndexOutOfRange exception?

  - by Jonathan M

  I am getting an IndexOutOfRange exception on the following line of code: var searchLastCriteria = (SearchCriteria)Session.GetSafely(WebConstants.KeyNames.SEARCH_LAST_CRITERIA); I'll explain the above here: SearchCriteria is an Enum with only two values Session is the HttpSessionState GetSafely is an extension method that looks like this: public static object GetSafely(this HttpSessionState source, string key) { try { return source[key]; } catch (Exception exc) { log.Info(exc); return null; } } WebConstants.KeyNames.SEARCH_LAST_CRITERIA is simply a constant I've tried everything to replicate this error, but I cannot reproduce it. I am beginning to think the stack trace is wrong. I thought perhaps the exception was actually coming from the GetSafely call, but it is swallowing the exceptions, so that can't be the case, and even if it was, it should show up in the stack trace. Is there anything in the line of code above that could possible throw an IndexOutOfRange exception? I know the line will throw an NullReferenceException if GetSafely returns null, and it will also throw an InvalidCastException if it returns anything that cannot be cast to SearchCriteria, but an IndexOutOfRange exception? I'm scratching my head here. Here is the stack trace: $LOG--> 2010-06-11 07:01:33,814 [ERROR] SERVERA (14) Web.Global - Index was outside the bounds of the array. System.Web.HttpUnhandledException: Exception of type 'System.Web.HttpUnhandledException' was thrown. ---> System.IndexOutOfRangeException: Index was outside the bounds of the array. at IterateSearchResult(Boolean next) in C:\Projects\Web\UserControls\AccountHeader.ascx.cs:line 242 at nextAccountLink_Click(Object sender, EventArgs e) in C:\Projects\Web\UserControls\AccountHeader.ascx.cs:line 232

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• Holding variables in memory, C++

  - by b-gen-jack-o-neill

  Today something strange came to my mind. When I want to hold some string in C (C++) the old way, without using string header, I just create array and store that string into it. But, I read that any variable definition in C in local scope of function ends up in pushing these values onto the stack. So, the string is actually 2* bigger than needed. Because first, the push instructions are located in memory, but then when they are executed (pushed onto the stack) another "copy" of the string is created. First the push instructions, than the stack space is used for one string. So, why is it this way? Why doesn't compiler just add the string (or other variables) to the program instead of creating them once again when executed? Yes, I know you cannot just have some data inside program block, but it could just be attached to the end of the program, with some jump instruction before. And than, we would just point to these data? Because they are stored in RAM when the program is executed. Thanks.

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• i don't know how to solve this error

  - by wide

  in local it works. when i load server, i got this error. Using themed css files requires a header control on the page. (e.g. <head runat="server" />). Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.InvalidOperationException: Using themed css files requires a header control on the page. (e.g. <head runat="server" />). Source Error: An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below. Stack Trace: [InvalidOperationException: Using themed css files requires a header control on the page. (e.g. <head runat="server" />).] System.Web.UI.PageTheme.SetStyleSheet() +2458406 System.Web.UI.Page.OnInit(EventArgs e) +8699420 System.Web.UI.Control.InitRecursive(Control namingContainer) +333 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +378

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• Mahout - Clustering - "naming" the cluster elements

  - by Mark Bramnik

  I'm doing some research and I'm playing with Apache Mahout 0.6 My purpose is to build a system which will name different categories of documents based on user input. The documents are not known in advance and I don't know also which categories do I have while collecting these documents. But I do know, that all the documents in the model should belong to one of the predefined categories. For example: Lets say I've collected a N documents, that belong to 3 different groups : Politics Madonna (pop-star) Science fiction I don't know what document belongs to what category, but I know that each one of my N documents belongs to one of those categories (e.g. there are no documents about, say basketball among these N docs) So, I came up with the following idea: Apply mahout clustering (for example k-mean with k=3 on these documents) This should divide the N documents to 3 groups. This should be kind of my model to learn with. I still don't know which document really belongs to which group, but at least the documents are clustered now by group Ask the user to find any document in the web that should be about 'Madonna' (I can't show to the user none of my N documents, its a restriction). Then I want to measure 'similarity' of this document and each one of 3 groups. I expect to see that the measurement for similarity between user_doc and documents in Madonna group in the model will be higher than the similarity between the user_doc and documents about politics. I've managed to produce the cluster of documents using 'Mahout in Action' book. But I don't understand how should I use Mahout to measure similarity between the 'ready' cluster group of document and one given document. I thought about rerunning the cluster with k=3 for N+1 documents with the same centroids (in terms of k-mean clustering) and see whether where the new document falls, but maybe there is any other way to do that? Is it possible to do with Mahout or my idea is conceptually wrong? (example in terms of Mahout API would be really good) Thanks a lot and sorry for a long question (couldn't describe it better) Any help is highly appreciated P.S. This is not a home-work project :)

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• Simple method for reliably detecting code in text?

  - by Jeff Atwood

  GMail has this feature where it will warn you if you try to send an email that it thinks might have an attachment. Because GMail detected the string see the attached in the email, but no actual attachment, it warns me with an OK / Cancel dialog when I click the Send button. We have a related problem on Stack Overflow. That is, when a user enters a post like this one: my problem is I need to change the database but I don't won't to create a new connection. example: DataSet dsMasterInfo = new DataSet(); Database db = DatabaseFactory.CreateDatabase("ConnectionString"); DbCommand dbCommand = db.GetStoredProcCommand("uspGetMasterName"); This user did not format their code as code! That is, they didn't indent by 4 spaces per Markdown, or use the code button (or the keyboard shortcut ctrl+k) which does that for them. Thus, our system is accreting a lot of edits where people have to go in and manually format code for people that are somehow unable to figure this out. This leads to a lot of bellyaching. We've improved the editor help several times, but short of driving over to the user's house and pressing the correct buttons on their keyboard for them, we're at a loss to see what to do next. That's why we are considering a Google GMail style warning: Did you mean to post code? You wrote stuff that we think looks like code, but you didn't format it as code by indenting 4 spaces, using the toolbar code button or the ctrl+k code formatting command. However, presenting this warning requires us to detect the presence of what we think is unformatted code in a question. What is a simple, semi-reliable way of doing this? Per Markdown, code is always indented by 4 spaces or within backticks, so anything correctly formatted can be discarded from the check immediately. This is only a warning and it will only apply to low-reputation users asking their first questions (or providing their first answers), so some false positives are OK, so long as they are about 5% or less. Questions on Stack Overflow can be in any language, though we can realistically limit our check to, say, the "big ten" languages. Per the tags page that would be C#, Java, PHP, JavaScript, Objective-C, C, C++, Python, Ruby. Use the Stack Overflow creative commons data dump to audit your potential solution (or just pick a few questions in the top 10 tags on Stack Overflow) and see how it does. Pseudocode is fine, but we use c# if you want to be extra friendly. The simpler the better (so long as it works). KISS! If your solution requires us to attempt to compile posts in 10 different compilers, or an army of people to manually train a bayesian inference engine, that's ... not exactly what we had in mind.

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• Improve Microsoft Visual C++ Application Security and Robustness with SafeInt

  In this age of cloud computing, massive parallel systems and complex security threats like identity theft and decentralized botnets, devoting resources to combat the seemingly age-old issue of integer overflow appears distinctly passC). Despite the fact that integer overflow is such a well know problem, particularly within C and C++ programming, the problem remains a real issue from both a defect and security standpoint, that's why the introduction of the SafeInt template class in Visual C++ 2010 to address overflows is a great addition.

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• IE issues with my Website (Help me fix my CSS)

  - by cam77

  I'm struggling geting my website to test fully positive in IE, the following problems keep arising, only in IE; My '#grey box' div displaying 200px to the left out of place, and it seems to move with the adjustment of the IE window size, does this in no other browsers, just IE. It creates this unnecessary horizontal scroll. I have the width set to pretty large, but have "overflow: hidden" and again, works fine across except for IE. On a few of my pages, the footer is somewhat cropped and out of place. My biggest concern is the particular page's CSS, pasted below. #container { width : 1265px; height : 920px; background-color : #addceb; overflow : hidden; padding : 0; } #logo { font-size : 38px; height : 167px; width : 427px; margin-left : 435px; padding-top : 20px; margin-bottom : -10px; margin-top: 10px; border : none; } #menunav { width : 100%; background-image : url(../imagesnew/menunav.png); background-repeat : repeat-x; height : 40px; text-align : center; font-size : 14px; font-family : Palatino Linotype, Book Antiqua, Palatino, FreeSerif, serif; overflow : auto; } #menunav ul { list-style-type : none; background-image : url(); height : 40px; width : 800px; margin : auto; } #menunav ul a { background-image : url(); background-repeat : no-repeat; background-position : right; padding-right : 32px; padding-left : 15px; display : block; line-height : 30px; text-decoration : none; font-size : 14px; } #mainbox { position : relative; background-image : url(../premiumslideimgs/premiumbox.png); background-repeat : no-repeat; width : 900px; height : 800px; margin-left : 16%; top : 22px; padding-top : 5px; overflow : hidden; } #simplegallery1 { position : absolute; left : 50%; width : 800px; height : 800px; margin-top : 44px; margin-bottom: -44px; margin-bottom : 240px; margin-left : -397px; background-color : #a1bbfe; padding-top : 0; } #textbelowbox { position : absolute; width : 830px; height : 45px; margin-left : 209px; margin-bottom : 240px; margin-top : -240px; overflow : hidden; } #footer { background-image : url(../imagesnew/footerimg.png); background-repeat : no-repeat; background-position : right; height : 275px; margin-top : -285px; } a:hover { color : #addceb; } #right { float : right; margin-top : 3px; } #left { float : left; margin-left : 30px; } body { font-family : Palatino Linotype, Book Antiqua, Palatino, FreeSerif, serif; background-color : #addceb; margin : 0; padding : 0; } #textabovebox { width : 920px; position : absolute; margin-left : 228px; margin-bottom : 80px; margin-top : 38px; z-index : 2000; font-family : Palatino Linotype, Book Antiqua, Palatino, FreeSerif, serif; } a.submenu:hover { color : #333; font-weight : bolder; } #dialog { font-size : 12px; } #greybox { position : absolute; width : 275px; height : 465px; margin-left : 715px; margin-top : 80px; overflow : hidden; z-index : 2000; } ul { background-image : url(); height : 40px; width : 800px; margin : auto; } ul a { background-image : url(); background-repeat : no-repeat; background-position : right; padding-right : 32px; padding-left : 15px; display : block; line-height : 30px; text-decoration : none; font-size : 14px; } li { float : left; } a:link { color : #ffffff; text-decoration : none; } a:visited { color : #ffffff; text-decoration : none; } a:active { color : #ffffff; text-decoration : none; } a:hover { color : #addceb; } #right { float : right; margin-top : 3px; } #left { float : left; margin-left : 30px; } #text { float : left; margin-left : 30px; } body { font-family : Palatino Linotype, Book Antiqua, Palatino, FreeSerif, serif; padding : 0; margin : 0; } body { background-color : #addceb; } a.submenu:link { color : #333333; } a.submenu:active { color : #333333; } a.submenu:visited { color : #333333; } a.submenu:hover { color : #333333; font-weight : bolder; } { margin: 0; padding: 0; } Please help if you can, thanks a lot.

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• Multiple Denial of Service vulnerabilities in Wireshark

  - by chandan

  CVE DescriptionCVSSv2 Base ScoreComponentProduct and Resolution CVE-2012-0041 Denial of Service(DoS) vulnerability 1.9 Wireshark Solaris 11 11/11 SRU 04 CVE-2012-0042 Denial of Service(DoS) vulnerability 2.9 CVE-2012-0043 Buffer Overflow vulnerability 5.4 CVE-2012-0066 Denial of Service(DoS) vulnerability 1.9 CVE-2012-0067 Denial of Service(DoS) vulnerability 1.9 CVE-2012-0068 Buffer Overflow vulnerability 4.4 This notification describes vulnerabilities fixed in third-party components that are included in Sun's product distribution.Information about vulnerabilities affecting Oracle Sun products can be found on Oracle Critical Patch Updates and Security Alerts page.

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• Getting a null reference exception exporting a slightly complex rdlc report to excel

  - by George Handlin

  Have an issue in exporting a slightly complex report to excel from an rdlc. Exporting a simple tabular report works fine, but getting a null reference exception with a more complex one. As is usually the case, it works on the server in the development environment, but not in the test environment. The server in the development environment has iis, sql and sql reporting services on it and test only has iis (I didn't set them up). I'm guessing there is something that gets installed with SSRS that is not installed with just the report viewer. The report has several parameters going into it and a few generic lists going in for datasources. Some tables for display as well as a list. Working with the 2005 version. Exception follows: [NullReferenceException: Object reference not set to an instance of an object.] Microsoft.ReportingServices.Rendering.ExcelRenderer.ExcelRenderer.RenderPageLayout(PageLayout pageLayout, Int32& currentPageNumber, Stack& stack) +91 Microsoft.ReportingServices.Rendering.ExcelRenderer.ExcelRenderer.RenderPageCollection(PageCollection pageCollection, Int32& currentPageNumber, Stack& stack, PageLayout& lastPageLayout) +607 Microsoft.ReportingServices.Rendering.ExcelRenderer.ExcelRenderer.GenerateWorkSheets() +150 Microsoft.ReportingServices.Rendering.ExcelRenderer.ExcelRenderer.GenerateMainSheet() +358 Microsoft.ReportingServices.Rendering.ExcelRenderer.ExcelRenderer.RenderExcelWorkBook(CreateAndRegisterStream createAndRegisterStream) +158 Microsoft.ReportingServices.Rendering.ExcelRenderer.ExcelRenderer.ProcessReport(CreateAndRegisterStream createAndRegisterStream) +385 Microsoft.ReportingServices.Rendering.ExcelRenderer.ExcelRenderer.Render(Report report, NameValueCollection reportServerParameters, NameValueCollection deviceInfo, NameValueCollection clientCapabilities, EvaluateHeaderFooterExpressions evaluateHeaderFooterExpressions, CreateAndRegisterStream createAndRegisterStream) +230 [ReportRenderingException: An error occurred during rendering of the report.] Microsoft.ReportingServices.Rendering.ExcelRenderer.ExcelRenderer.Render(Report report, NameValueCollection reportServerParameters, NameValueCollection deviceInfo, NameValueCollection clientCapabilities, EvaluateHeaderFooterExpressions evaluateHeaderFooterExpressions, CreateAndRegisterStream createAndRegisterStream) +296 Microsoft.ReportingServices.ReportProcessing.ReportProcessing.RenderSnapshot(IRenderingExtension renderer, CreateReportChunk createChunkCallback, RenderingContext rc, GetResource getResourceCallback) +1124 [WrapperReportRenderingException: An error occurred during rendering of the report.] Microsoft.ReportingServices.ReportProcessing.ReportProcessing.RenderSnapshot(IRenderingExtension renderer, CreateReportChunk createChunkCallback, RenderingContext rc, GetResource getResourceCallback) +1681 Microsoft.Reporting.LocalService.RenderWithDataCache(PreviewItemContext itemContext, ParameterInfoCollection reportParameters, IEnumerable dataSources, DatasourceCredentialsCollection credentials, IRenderingExtension renderer, ReportProcessing repProc, CreateAndRegisterStream createStreamCallback, ReportRuntimeSetup runtimeSetup) +1693 Microsoft.Reporting.LocalService.Render(PreviewItemContext itemContext, Boolean allowInternalRenderers, ParameterInfoCollection reportParameters, IEnumerable dataSources, DatasourceCredentialsCollection credentials, CreateAndRegisterStream createStreamCallback, ReportRuntimeSetup runtimeSetup, ProcessingMessageList& warnings) +227 Microsoft.Reporting.WebForms.LocalReport.InternalRender(String format, Boolean allowInternalRenderers, String deviceInfo, CreateAndRegisterStream createStreamCallback, Warning[]& warnings) +235 [LocalProcessingException: An error occurred during local report processing.] Microsoft.Reporting.WebForms.LocalReport.InternalRender(String format, Boolean allowInternalRenderers, String deviceInfo, CreateAndRegisterStream createStreamCallback, Warning[]& warnings) +276 Microsoft.Reporting.WebForms.LocalReport.InternalRender(String format, Boolean allowInternalRenderers, String deviceInfo, String& mimeType, String& encoding, String& fileNameExtension, String[]& streams, Warning[]& warnings) +189 Microsoft.Reporting.WebForms.LocalReport.Render(String format, String deviceInfo, String& mimeType, String& encoding, String& fileNameExtension, String[]& streams, Warning[]& warnings) +28 Microsoft.Reporting.WebForms.LocalReportControlSource.RenderReport(String format, String deviceInfo, NameValueCollection additionalParams, String& mimeType, String& fileNameExtension) +52 Microsoft.Reporting.WebForms.ExportOperation.PerformOperation(NameValueCollection urlQuery, HttpResponse response) +153 Microsoft.Reporting.WebForms.HttpHandler.ProcessRequest(HttpContext context) +202 System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +303 System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +64

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• cmake doesn't work in windows XP

  - by Runner

  I'm new with cmake,just installed it and following this article: http://www.cs.swarthmore.edu/~adanner/tips/cmake.php D:\Works\c\cmake\build>cmake .. -- Building for: NMake Makefiles CMake Warning at CMakeLists.txt:2 (project): To use the NMake generator, cmake must be run from a shell that can use the compiler cl from the command line. This environment does not contain INCLUDE, LIB, or LIBPATH, and these must be set for the cl compiler to work. -- The C compiler identification is unknown -- The CXX compiler identification is unknown CMake Warning at D:/Tools/CMake 2.8/share/cmake-2.8/Modules/Platform/Windows-cl.cmake:32 (ENABLE_LANGUAGE): To use the NMake generator, cmake must be run from a shell that can use the compiler cl from the command line. This environment does not contain INCLUDE, LIB, or LIBPATH, and these must be set for the cl compiler to work. Call Stack (most recent call first): D:/Tools/CMake 2.8/share/cmake-2.8/Modules/CMakeCInformation.cmake:58 (INCLUDE) CMakeLists.txt:2 (project) CMake Error: your RC compiler: "CMAKE_RC_COMPILER-NOTFOUND" was not found. Please set CMAKE_RC_COMPILER to a valid compiler path or name. -- Check for CL compiler version -- Check for CL compiler version - failed -- Check if this is a free VC compiler -- Check if this is a free VC compiler - yes -- Using FREE VC TOOLS, NO DEBUG available -- Check for working C compiler: cl CMake Warning at CMakeLists.txt:2 (PROJECT): To use the NMake generator, cmake must be run from a shell that can use the compiler cl from the command line. This environment does not contain INCLUDE, LIB, or LIBPATH, and these must be set for the cl compiler to work. CMake Warning at D:/Tools/CMake 2.8/share/cmake-2.8/Modules/Platform/Windows-cl.cmake:32 (ENABLE_LANGUAGE): To use the NMake generator, cmake must be run from a shell that can use the compiler cl from the command line. This environment does not contain INCLUDE, LIB, or LIBPATH, and these must be set for the cl compiler to work. Call Stack (most recent call first): D:/Tools/CMake 2.8/share/cmake-2.8/Modules/CMakeCInformation.cmake:58 (INCLUDE) CMakeLists.txt:2 (PROJECT) CMake Error at D:/Tools/CMake 2.8/share/cmake-2.8/Modules/CMakeRCInformation.cmake:22 (GET_FILENAME_COMPONENT): get_filename_component called with incorrect number of arguments Call Stack (most recent call first): D:/Tools/CMake 2.8/share/cmake-2.8/Modules/Platform/Windows-cl.cmake:32 (ENABLE_LANGUAGE) D:/Tools/CMake 2.8/share/cmake-2.8/Modules/CMakeCInformation.cmake:58 (INCLUDE) CMakeLists.txt:2 (PROJECT) CMake Error: CMAKE_RC_COMPILER not set, after EnableLanguage CMake Error: your C compiler: "cl" was not found. Please set CMAKE_C_COMPILER to a valid compiler path or name. CMake Error: Internal CMake error, TryCompile configure of cmake failed -- Check for working C compiler: cl -- broken CMake Error at D:/Tools/CMake 2.8/share/cmake-2.8/Modules/CMakeTestCCompiler.cmake:52 (MESSAGE): The C compiler "cl" is not able to compile a simple test program. It fails with the following output: CMake will not be able to correctly generate this project. Call Stack (most recent call first): CMakeLists.txt:2 (project) CMake Error: your C compiler: "cl" was not found. Please set CMAKE_C_COMPILER to a valid compiler path or name. CMake Error: your CXX compiler: "cl" was not found. Please set CMAKE_CXX_COMPILER to a valid compiler path or name. -- Configuring incomplete, errors occurred! What are the complete requirement to use cmake successfully in windows XP?I've already installed Visual Studio under D:\Tools\Microsoft Visual Studio 9.0

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• C# asp:ListBox hide vertical scrollbar

  - by Codeffect

  How to hide the vertical scroll bar of a Listbox that is present inside a div. <div id="lstQueriesDiv" style="overflow-y: hidden !important; overflow-x: auto !important; Width: 650px; height:167px;" > <asp:ListBox ID="lstQueries" runat="server" CssClass="cssLstQueries" Rows="9"></asp:ListBox> </div> css: .cssLstQueries{ Width:auto; } I want to hide the vertical scrollbar of the listbox not the the vertical scrollbar of the div.

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• djb2 Hash Function

  - by Jainish

  I am using the djb2 algorithm to generate the hash key for a string which is as follows hash(unsigned char *str) { unsigned long hash = 5381; int c; while (c = *str++) hash = ((hash << 5) + hash) + c; /* hash * 33 + c */ return hash; } Now with every loop there is a multiplication with two big numbers, After some time with the 4th of 5th character of the string there is a overflow as the hash value becomes huge What is the correct way to refactor so that the hash value does not overflow and the hashing also happens correctly

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• Simultaneously calling multiple methods on a WCF service from silverlight

  - by ola karlsson

  A while back I had to debug some performance issues in an existing Silverlight app, as the problem / solution was a bit obscure and finding info about it was quite tricky, I thought I’d share, maybe it can help the next person with this problem. The App On start, the app would do a number of calls to different methods on a WCF service, this to populate the UI with the necessary data. Recently one of those services had been changed and was now taking quite a bit longer than it used to. This was resulting in quite a long loading time for the whole UI, which was set up so it wouldn’t let the user interact with anything, until all the service calls had finished. First I broke out the longer running service call from the others, then removed the constraint that it had to be loaded for the UI in general to become responsive. I also added a loading indicator just on that area of the UI, thinking that the main UI would load while this particular section could keep loading independently. The Problem However this is where things started to get a bit strange. I found that even after these changes, the main UI wouldn’t activate until the long running call returned. So now, I did what I should have done to start with, I got Fiddler out and had a look at what was really happening. What I found was that, once the call to the long running service method was placed, all subsequent call were waiting for that one to return before executing. Not having really worked with WCF previously or knowing much about it in general, I was stumped… I knew of the issues where Silverlight is restricted by the browsers networking features in regards to number of simultaneous connections etc. However that just didn’t seem to be the issue here, you can clearly see in Fiddler that there’s numerous calls, but they’re just not returning. I thought of the problem maybe being in the WCF service, but the calls were really not that complicated and surely the service should be able to handle a lot more than what I was throwing at it! So I did what every developer does in this type of scenario, I hit the search engines. I did a whole bunch of searching on things like “multiple simultaneous WCF calls from Silverlight” and “Calling long running WCF services from Silverlight” etc. etc. This however, pretty much got me nowhere, I found a whole heap of resources on how to do WCF calls from Silverlight but most of them were very basic and of no use what so ever. The fog is clearing It wasn’t until I came across the term “ WCF blocking calls” and started incorporating that in my searches I started to get somewhere. Those searches quite quickly brought me to the following thread in the Silverlight forum “Long-running WCF call blocking subsequent calls” which discussed the exact problem I was facing and the best part, one of the guys there had the solution! The short answer is in the forum post and the guys answering, has also done a more extensive blog post about it called “Silverlight, WCF, and ASP.Net Configuration Gotchas” which covers it very well.  So come on what’s the solution?! I heard you ask, unless you’ve already gone to the links and looked it up ;) The Solution Well, it turns out that the issue is founded in a mix of Silverlight, Asp.Net and WCF, basically if you’re doing multiple calls to a single WCF web-service and you have Asp.Net session state enabled, the calls will be executed sequentially by the service, hence any long running calls will block subsequent ones. So why is Asp.Net session state effecting us, we’re working in Silverlight, right? We'll as mentioned earlier, by default Silverlight uses the browsers networking stack when doing service calls, hence to the WCF service, the call looks like it might as well be coming from a normal Asp.Net. To get around this, we look to a feature introduced in Silverlight 3, namely the Client HTTP Stack. The Client HTTP Stack to the rescue By using the following syntax (for example in our App.xaml.cs, Application_Startup method) WebRequest.RegisterPrefix("http://", WebRequestCreator.ClientHttp); we can set our Silverlight application to use the Client HTTP Stack, which incidentally solves our problem! By using Silverlights own networking stack, rather than that of the browser, we get around the Asp.Net - WCF session state issue. The above code specifies that all calls to addresses starting with “http://” should go through the client stack, this can actually be set more granular and you can specify it to be used only for certain domains etc. Summary The actual solution is well covered in the forum and blog posts I link to above. This post is more about sharing my experience, hopefully helping to spread the word about this and maybe make it a bit easier for the next poor guy with this issue to find the solution. Until next time, Ola

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• regex search a mysql text column

  - by Ian

  Okay, I thought my head hurt with regular regex, but I can't seem to find what I'm looking for with regexp in mysql. I'm trying to look for situations in news articles where a Textile-formatted url has not ended with a slash so: "Catherine Zeta-Jones":/cr/catherinezeta-jones/ visited stack overflow is ok but "Catherine Zeta-Jones":/cr/catherinezeta-jones visited stack overflow is not. [just used Catherine as an example because I'm assuming an alpha search wouldn't catch the hyphen] One of these days I'll have to do that goat sacrifice so I can gain the proper knowledge of regex. Thanks everyone!

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• Unnecessary scroll bars appearing in IE8

  - by Abhishek Jain

  Hi, In my web app there is a page(ChildPage) which is actually contained in an iframe element of another page(ParentPage). This ChildPage has its contents placed in ContentPlaceHolder of a MasterPage. <div id="DivScroll" runat="server" style="overflow-y: auto; overflow-x: auto; width: 100%; height: 100%;"> <asp:ContentPlaceHolder ID="ContentPlaceHolder1" runat="server"> </asp:ContentPlaceHolder> </div> As apparent in the code, contents of ChildPage are scrollable in the div containing it. There is never the need for the scroll bars of browser to appear and it is working this way till IE7. In IE8 browser scrollbras are appearing due to the presence of the following div in ChildPage. <div class="ReadOnlyFlat" id="Div1" style="z-index: 100; visibility: hidden; overflow: auto; width: 100%; position: absolute; height: 300px" runat="server" ms_positioning="FlowLayout"> <radA:RadAjaxPanel ID="RadAjaxPanelA" EnableOutsideScripts="True" runat="server"> <radT:RadTreeView ID="RadTreeView2" TabIndex="1" runat="server" Skin="web20"> <NodeTemplate> <asp:Label ID="Label2" runat="server">Label</asp:Label> <asp:Label ID="Label4" runat="server" Width="10px"></asp:Label> <asp:Label ID="Label3" runat="server" ForeColor="#FF8000" Font-Bold="True">Label</asp:Label> </NodeTemplate> </radT:RadTreeView> </radA:RadAjaxPanel> What actually happens in IE8 is as follows: The above div Div1 is diaplyed on the click of an ImageButton. On the page load this ImageButton is present on the bottom of the page. In this case IE8 shows browser's vertical scrollbar due to height of Div1. When I scroll DivScroll shown in first code snippet, the ImageButton moves up. When the ImageButton is moved sufficiently up so that it is above the bottommost part of page by more than 300px(i.e, the height of Div1) and if I click the ImageButton, the browser's vertical scrollbars disappear. Browser's vertical scrollbar appears in case the distance between ImageButton and the bottom most part of page is less than height of Div1 and disappears when the distance is more than height of Div1. I need that the browser's vertical scrollbar never appears. Please Help.

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• Does Python support short-circuiting?

  - by Dinah

  Surprisingly, I was unable to find the answer to this on Stack Overflow: Does Python support short-circuiting in boolean expressions?

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• IE6 "frame" layout with 100% height and scrollbars

  - by Joe

  I want to achieve a simple "frame" layout with fixed header, fixed left navigation area, and a main content area that fills 100% of the remainder of the viewport with scrollbars if necessary. My best attempt is below - but when I add enough content to the main div to force scrolling, I see that the scrollbar extends below the bottom of the viewport. What am I doing wrong? Or what is IE6 doing wrong and how can I fix it? NB please don't recommend using a more recent browser - I'd love to but can't. <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" > <head> <title></title> <style type="text/css"> html, body { height:100%; margin:0; padding:0; overflow:hidden; } div { border:0; margin:0; padding:0; } div#top { background-color:#dddddd; height:100px; } div#left { background-color:#dddddd; float:left; width:120px; height:100%; overflow:hidden; } div#main { height:100%; overflow:auto; } </style> </head> <body> <div id="top">Title</div> <div id="left">LeftNav</div> <div id="main"> Content <p> Lorem ipsum ... </p> ... repeated several times ... </div> </body> </html>

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• Galleria jQuery plugin briefly shows all images in IE 7 & 8

  - by hollyb

  I'm using the galleria jQuery plugin on a site. When the gallery first loads, all of the images appear briefly & vertically in ie 7 & 8. This doesn't happen when i isolate the gallery, only when i put it on a somewhat heavy page. This leads me to believe that it happens when the page is a little slow to load. Does anybody know a way to fix this? I feel like an overflow: hidden should fix this, but I've applied it along with a height in every container I could think of. Anybody have any ideas? Here is my css: .galleria{list-style:none;width:350px; overflow:hidden; height: 70px;} .galleria li{display:block;width:50px;height:50px;overflow:hidden;float:left;margin:4px 10px 20px 0;} .galleria li a{display:none;} .galleria li div{position:absolute;display:none;top:0;left:180px;} .galleria li div img{cursor:pointer;} .galleria li.active div img,.galleria li.active div{display:block;} .galleria li img.thumb{cursor:pointer;top:auto;left:auto;display:block;width:auto;height:auto} .galleria li .caption{display: inline;padding-top:.5em; width: 300px; } * html .galleria li div span{width:350px;} /* MSIE bug */ html: <ul class="gallery"> <li class="active"><img src="1.jpg" cap="A great veiw by so and so. This is a long block of info.<br /><span style=color:#666;>Photo by: Billy D. Williams</span>" alt="Image01"></li> <li><img src="2.jpg" cap="A mountain <span style=color:#666;>Photo by: Billy D. Williams</span>" alt="Image01"></li> <li><img src="3.jpg" cap="Another witty caption <span style=color:#666;>Photo by: Billy D. Williams</span>" alt="Image01"></li> <li><img src="4.jpg" cap="<span style=color:#666;>Photo by: Billy D. Williams</span>" alt="Image01"></li> </ul>

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• Why Chrome does not show CSS3 ::-webkit-scrollbar scrollbar for iframe?

  - by Binyamin

  Why Chrome does not show CSS3 ::-webkit-scrollbar scrollbar for iframe? Demo http://jsfiddle.net/laukstein/C9s3P/ <iframe scrolling="yes" style="overflow-x:hidden; overflow-y:scroll; width:150px; height:50px;" src="http://en.wikipedia.org/wiki/Web_browser"></iframe> CSS ::-webkit-scrollbar{ width:0.8em; height:0.8em; background-color:#fff; } ::-webkit-scrollbar:hover{ background-color:#eee; } ::-webkit-resizer{ -webkit-border-radius:4px; background-color:#666; } ::-webkit-scrollbar-thumb{ min-height:0.8em; min-width:0.8em; -webkit-border-radius:4px; background-color: #ddd; } ::-webkit-scrollbar-thumb:hover{ background-color: #bbb; } ::-webkit-scrollbar-thumb:active{ background-color:#888; }

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• How do we group in BIRT without wasting lines, and still only printing the group item on the first l

  - by paxdiablo

  When grouping in BIRT, we frequently want the grouping value to show up on the first line as follows: Group User Reputation ------ --------------- ---------- Admins Bill The Weasel 51,018 Mark Grovel 118,101 Users pax_my_bags 73,554 Jon Scoot **,***,*** <- overflow clueless 92,928 The normal way of acheiving this is to lay out the group in the designer as follws: +---------+--------+--------------+ Tbl Hdr | Group | User | Reputation | +---------+--------+--------------+ Grp Hdr | [Group] | | | +---------+--------+--------------+ Grp Dtl | | [User] | [Reputation] | +---------+--------+--------------+ Grp Ftr | | | | +---------+--------+--------------+ Tbl Ftr | | | | +---------+--------+--------------+ which, unfortunately, lays out the data in exactly that way, with the grouped value on a different line: Group User Reputation ------ --------------- ---------- Admins Bill The Weasel 51,018 Mark Grovel 118,101 Users pax_my_bags 73,554 Jon Scoot **,***,*** <- overflow clueless 92,928 This is particularly painful with data where there's lots of groups with only one user since we use twice as much space as needed. If we move the [Group] data item down to the Grp Dtl line, we get it printed for every line in the group. How, in BIRT, do we merge the two lines Grp Hdr and the first Grp Dtl?

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• Recursion VS memory allocation

  - by Vladimir Kishlaly

  Which approach is most popular in real-world examples: recursion or iteration? For example, simple tree preorder traversal with recursion: void preorderTraversal( Node root ){ if( root == null ) return; root.printValue(); preorderTraversal( root.getLeft() ); preorderTraversal( root.getRight() ); } and with iteration (using stack): Push the root node on the stack While the stack is not empty Pop a node Print its value If right child exists, push the node's right child If left child exists, push the node's left child In the first example we have recursive method calls, but in the second - new ancillary data structure. Complexity is similar in both cases - O(n). So, the main question is memory footprint requirement?

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• openmp in mex : stackoverflow error

  - by Edwin

  i have got the following fraction of code that getting me the stack overflow error #pragma omp parallel shared(Mo1, Mo2, sum_normalized_p_gn, Data, Mean_Out,Covar_Out,Prior_Out, det) private(i) num_threads( number_threads ) { //every thread has a new copy double* normalized_p_gn = (double*)malloc(NMIX*sizeof(double)); #pragma omp critical { int id = omp_get_thread_num(); int threads = omp_get_num_threads(); mexEvalString("drawnow"); } #pragma omp for //some parallel process..... } the variables declared in the shared are created by malloc. and they consumes with large amount of memory there are 2 questions regarding to the above code. 1) why this would generate the stack overflow error( i.e. segmentation fault) before it goes into the parallel for loop? it works fine when it runs in the sequential mode.... 2) am i right to dynamic allocate memory for each thread like "normalized_p_gn" above? Regards Edwin

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