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  • What exactly are signals and slots in Qt?

    - by Jen
    I know how they work conceptually, but how are signals and slots implemented in the Qt framework? Qt Creator treats them as keywords, but are they simply a set of macros, or is a special pre-processor required before these source files can be compiled? In other words, if I use Qt's signal/slot features in my code, can I easily compile it on any C++ compiler?

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  • Wix Bootstrapper - difficulty detecting if software is already installed c++ redistributable, sql server ce 3.5 sp2

    - by gdeck
    I apologize if this is answered elsewhere. So far (thanks to a post from Rob Mensching), my code will detect .NET 4.0 if it's installed and it'll pass right over it. I'm not able to correctly detect Microsoft Visual C++ 2010 x86 Redistributable OR Microsoft SQL Server Compact 3.5 Service Pack 2. My code is below. I'm learning, so I would appreciate as much constructive criticism as possible. <!--Search for .NET 4.0--> <util:RegistrySearch Id="NETFRAMEWORK40" Root="HKLM" Key="SOFTWARE\Microsoft\Net Framework Setup\NDP\v4\Full" Value="Install" Variable="NETFRAMEWORK40" Result="value"/> <!--Search for Microsoft Visual C++ 2010 x86 Redistributable--> <util:RegistrySearch Id="SearchForCPP2010X86" Root="HKLM" Key="SOFTWARE\Microsoft\VisualStudio\10.0\VC\VCRedist\x86" Value="Install" Variable="CPP2010Redist" Result="exists"/> <!--Search for Microsoft SQL Server Compact 3.5 Service Pack 2--> <util:RegistrySearch Id="SearchForSQLSvrCE35SP2" Root="HKLM" Key="SOFTWARE\Microsoft\Microsoft SQL Server Compact Edition\v3.5\ENU" Value="Install" Variable="SQLSvrCE35SP2" Result="exists"/> <Chain> <!-- Install .Net 4 Full --> <PackageGroupRef Id="Net4Full"/> <!-- Install Microsoft Visual C++ 2010 x86 Redistributable --> <PackageGroupRef Id="MSVisCPP2010x86Redist"/> <!-- Install Microsoft SQL Server Compact 3.5 Service Pack 2 --> <PackageGroupRef Id="SQLExpressCE"/> </Chain> <!--Install .NET 4.0--> <PackageGroup Id="Net4Full"> <ExePackage Id="Net4Full" Name="Microsoft .NET Framework 4.0 Setup" Cache="no" Compressed="yes" PerMachine="yes" Permanent="yes" Vital="yes" SourceFile="BootstrapperLibrary\dotNetFx40_Full_setup.exe" DetectCondition="NETFRAMEWORK40"/> </PackageGroup> <!--Install Microsoft Visual C++ 2010 x86 Redistributable--> <PackageGroup Id="MSVisCPP2010x86Redist"> <ExePackage Id="MSVisCPP2010x86Redis" Name="Microsoft Visual C++ 2010 x86 Redistributable " Cache="no" Compressed="yes" PerMachine="yes" Permanent="yes" Vital="yes" SourceFile="BootstrapperLibrary\vcredist_x86.exe" DetectCondition="CPP2010Redist"/> </PackageGroup> <!--Install Microsoft SQL Server Compact 3.5 Service Pack 2--> <PackageGroup Id="SQLExpressCE"> <ExePackage Id="SQLExpressCE" Name="Microsoft SQL Server Compact 3.5 Service Pack 2 Setup" Cache="no" Compressed="yes" PerMachine="yes" Permanent="yes" Vital="yes" SourceFile="BootstrapperLibrary\SSCERuntime-ENU.exe"/> </PackageGroup>

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  • KohanaPHP redirection loop

    - by sorrko
    Hello, I got problem. I'm builing an app with KohanaPHP framework and I got rediretion endless loop. Here's the code I put in constructor oh my main controller: if(empty($this->user->real_name)) { url::redirect('/'); } Any ideas how to solve that issue?

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  • Spring Security 3 - Login is not working

    - by newbie
    I use Spring Security with Spring Framework 3 and when I tyr to login from homepage I get following error: 2010-04-26 12:16:39,525 [tomcat-http--2] WARN org.springframework.web.servlet.PageNotFound - No mapping found for HTTP request with URI [/AppName/app/j_spring_security_check] in DispatcherServlet with name 'Spring MVC Dispatcher Servlet' Spring Security is initialized as loggings tell and there are no errors. So what could be reason for this error? I have understood that j_spring_security_check is default url for Spring Security login chekeing servlet.

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  • Recommendations for a free GIS library supporting raster images

    - by gspr
    Hi. I'm quite new to the whole field of GIS, and I'm about to make a small program that essentially overlays GPS tracks on a map together with some other annotations. I primarily need to allow scanned (thus raster) maps (although it would be nice to support proper map formats and something like OpenStreetmap in the long run). My first exploratory program uses Qt's graphics view framework and overlays the GPS points by simply projecting them onto the tangent plane to the WGS84 ellipsoid at a calibration point. This gives half-decent accuracy, and actually looks good. But then I started wondering. To get the accuracy I need (i.e. remove the "half" in "half-decent"), I have to correct for the map projection. While the math is not a problem in itself, supporting many map projection feels like needless work. Even though a few projections would probably be enough, I started thinking about just using something like the PROJ.4 library to do my projections. But then, why not take it all the way? Perhaps I might aswell use a full-blown map library such as Mapnik (edit: Quantum GIS also looks very nice), which will probably pay off when I start to want even more fancy annotations or some other symptom of featuritis. So, finally, to the question: What would you do? Would you use a full-blown map library? If so, which one? Again, it's important that it supports using (and zooming in and out with) raster maps and has pretty overlay features. Or would you just keep it simple, and go with Qt's own graphics view framework together with something like PROJ.4 to handle the map projections? I appreciate any feedback! Some technicalities: I'm writing in C++ with a Qt-based GUI, so I'd prefer something that plays relatively nicely with those. Also, the library must be free software (as in FOSS), and at least decently cross-platform (GNU/Linux, Windows and Mac, at least). Edit: OK, it seems I didn't do quite enough research before asking this question. Both Quantum GIS and Mapnik seem very well suited for my purpose. The former especially so since it's based on Qt.

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  • Can you reverse order a string in one line with LINQ or a LAMBDA expression

    - by Student for Life
    Not that I would want to use this practically (for many reasons) but out of strict curiousity I would like to know if there is a way to reverse order a string using LINQ and/or LAMBDA expressions in one line of code, without utilising any framework "Reverse" methods. e.g. string value = "reverse me"; string reversedValue = (....); and reversedValue will result in "em esrever" EDIT Clearly an impractical problem/solution I know this, so don't worry it's strictly a curiosity question around the LINQ/LAMBDA construct.

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  • How to write a CXF client with implicit security header.

    - by Jayaprakash
    Hi everyone, I have to access a service which is developed using different framework. The client program is using CXF. I dont have access to the provider environment so I cannot use any config files (Cxf.xml, cxfservlet.xml etc..). I need to access the webservice with implicit security header (UsernameTokenType, oasis-200401-wss-wssecurity-secext-1.0.xsd) . Can anyone throw some light on this?..

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  • Kohana newbie - sample CRUD application

    - by titel
    I'm completely new to this framework and I'm trying to find some sample CRUD application to get started with Kohana 3. There is a tutorial and information in the unofficial Kohana 3 Wiki (http://kerkness.ca/wiki/doku.php), but event there, there are some aspects that are not covered (the model, validation, etc).

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  • Symbian V/S windows mobile

    - by messy123
    Hi, i have done the UI development on windows mobile platform using C#, presently i am a symbian developer, i am using Qt framework for the developemnt process. i want to know out of these symbian and windows mobile, which has the feature, boom. i will be anticipating the answers from you.

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  • Using the Callback Method on a View in ASP.NET MVC

    - by Tony
    I have a master page with that code: public string CallbackMethod; protected void Page_Load(object sender, EventArgs e) { CallbackMethod = Page.ClientScript.GetCallbackEventReference(this, "message", "Dodanie", "context", true); } /other code here/ then, in the View (which is based on that master page) I need to invoke the CallbackMethod string, but the problem is, the framework firstly renders the View, and then invokes the Page_Load method. As the obvious result, the error appears: the name 'CallbackMethod' does not exist in the current context. How do I fix this?

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  • Is it possible to use ASP.NET Dynamic Data and SubSonic 3?

    - by James
    Is it possible to use ASP.NET Dynamic Data with SubSonic 3 in-place of Linq to SQL classes or the Entity Framework? MetaModel.RegisterContext() throws an exception if you use the context class that SubSonic generates. I thought I remembered coming across a SubSonic/Dynamic Data example back before SubSonic 3 was released but I can't find it now. Has anyone been able to get this to work?

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  • JSON Web Service over simple HTTP GET/POST

    - by whoi
    Hi; Can you suggest a way or a framework or etc. for JEE in order to make simple HTTP GET/POST calls to some web services like in SOAP web services but transport format must be JSON; not XML and there must not be any wrapper around(may be some vey lightweight header) like SOAP etc. In short, my purpose is to serve web services using JSON and HTTP Get/Post in a maximum possible lightweight solution. Thanks

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  • Why second user login redirects me to /accounts/profile/ url?

    - by drupality
    I am using Django built in view for user login: url(r'^user/login/$', 'django.contrib.auth.views.login', {'template_name': 'users/templates/login.html'}, name='user-login'), After login when I goto user/login again I can login second time. I submit the form and getting: The current URL, accounts/profile/, didn't match any of these. I haven't declare this url in urls.py. What I am doing wrong? Why framework want to redirect to this url?

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  • Attaining Explicit and Predictable Ruby on Rails...

    - by Winston
    I need help, how can I learn this framework? Here's what I need to know. Routes, it's expected outcome, the prefix/suffix methods associated with every changes made with it. ActiveRecord, the dynamic generation of methods, the behind the scenes with prefix_ and _suffix methods. The View, how do I know what prefix/suffix methods can be used in the View. Is there's a way to know all those behind-the-scenes actions in console.

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  • Stored Functions with Linq to Entities

    - by Lawnmower
    Hi, How can I make a MS-SQL stored function availabe in LINQ expressions if using the Entity framework? The SQL function was created with CREATE FUNCTION MyFunction(@name) ...). I was hoping to access it similarly to this: var data = from c in entities.Users where MyFunction(c.name) = 3; Unfortunately I have only .NET 3.5 available.

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  • What's your "best practice" for the first Java EE Spring project?

    - by cringe
    I'm currently trying to get into the Java EE development with the Spring framework. As I'm new to Spring, it is hard to imaging how a good running project should start off. Do you have any best practices, tipps or major DO NOTs for a starter? How did you start with Spring - big project or small tutorial-like applications? Which technology did you use right away: AOP, complex Hibernate...

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  • How to quote and reference MS SQL table and field names

    - by artvolk
    Good day! Despite the fact LINQ2SQL and ADO.NET Entity Framework exists there were situations when I need to revert to plain old DataSet (not typed) and friends. While writing SQL for SqlCommand: Is it needed to quote field and table names with []? Is it good to prefix table names with [dbo] I use to use this syntax: SqlCommand command = new SqlCommand("SELECT [Field1], [Field2] FROM [dbo].[TableName]", connection); May be there is a better way? Thanks in advance!

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  • Is it possible to reliably auto-decode user files to Unicode? [C#]

    - by NVRAM
    I have a web application that allows users to upload their content for processing. The processing engine expects UTF8 (and I'm composing XML from multiple users' files), so I need to ensure that I can properly decode the uploaded files. Since I'd be surprised if any of my users knew their files even were encoded, I have very little hope they'd be able to correctly specify the encoding (decoder) to use. And so, my application is left with task of detecting before decoding. This seems like such a universal problem, I'm surprised not to find either a framework capability or general recipe for the solution. Can it be I'm not searching with meaningful search terms? I've implemented BOM-aware detection (http://en.wikipedia.org/wiki/Byte_order_mark) but I'm not sure how often files will be uploaded w/o a BOM to indicate encoding, and this isn't useful for most non-UTF files. My questions boil down to: Is BOM-aware detection sufficient for the vast majority of files? In the case where BOM-detection fails, is it possible to try different decoders and determine if they are "valid"? (My attempts indicate the answer is "no.") Under what circumstances will a "valid" file fail with the C# encoder/decoder framework? Is there a repository anywhere that has a multitude of files with various encodings to use for testing? While I'm specifically asking about C#/.NET, I'd like to know the answer for Java, Python and other languages for the next time I have to do this. So far I've found: A "valid" UTF-16 file with Ctrl-S characters has caused encoding to UTF-8 to throw an exception (Illegal character?) (That was an XML encoding exception.) Decoding a valid UTF-16 file with UTF-8 succeeds but gives text with null characters. Huh? Currently, I only expect UTF-8, UTF-16 and probably ISO-8859-1 files, but I want the solution to be extensible if possible. My existing set of input files isn't nearly broad enough to uncover all the problems that will occur with live files. Although the files I'm trying to decode are "text" I think they are often created w/methods that leave garbage characters in the files. Hence "valid" files may not be "pure". Oh joy. Thanks.

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