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  • Is it safe to draw three separate QImages in three separate QThreads?

    - by yan bellavance
    I have a QMainWindow with three widgets inside that are promoted to a class containing a subclassed QThread. They each draw on a local QImage in their rexpective qthread which is sent with a signal once its drawn and then rendered by calling update (mandlebrot example) from the slot. Is this safe or dangerous? They do not share any data, at least none that I am generating and am wondering what data they could be sharing that is outside of my coding range ie that is generated by Qt automatically.

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  • Looping on a closed range

    - by AProgrammer
    How would you fix this code? template <typename T> void closed_range(T begin, T end) { for (T i = begin; i <= end; ++i) { // do something } } T is constrained to be an integer type, can be the wider of such types and can be signed or unsigned begin can be numeric_limits<T>::min() end can be numeric_limits<T>::max() (in which case ++i will overflow in the above code) I've several ways, but none I really like.

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  • Visual Studio Code Analysis - Does Microsoft follow it themselves?

    - by Oskar Kjellin
    Did a quick search but could not find anything about this. I guess all of you know that the Visual Studio Code Analysis is quite nitpicking and gives warnings about a lot of things. Does anybody know how well Microsoft follow this themselves..? That is, if I were to run a code analysis on their assemblies, would the warnings be none or very few (perhaps surpress warning with a justification..?).

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  • A Beginners' Guide to Learning JavaScript?

    - by CloseDiamond
    There's a few mentions of Javascript newbies getting starting by checking out some of Douglas Crockford's work (http://stackoverflow.com/questions/11246/best-resources-to-learn-javascript), but none of his resources seem to be for those looking to learn from the ground up. Are there any suggestions for complete beginners regarding how best to learn JavaScript? Personally I have plenty of HTML and CSS experience, and some PHP (which would help learning JS), but for those that don't know any programming language what would you recommend?

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  • In mercurial, is there a way to disable ALL configurations (system, user, repo)?

    - by Geoffrey Zheng
    On any non-trivial hg installation, the hgrc's tend to contain significant stuff. Is there a way to completely ignore/bypass ALL configurations, from system, user, to repo-level? The use case is to use some hg core functionalities in some automation scripts. Currently, if anything is misconfigured (and I mess with my ~/.hgrc a lot), the scripts will abort for something it doesn't use at all. It'd be perfect is I can just hg <whatever> --config:none.

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  • How to get rid of box around linked image

    - by Earlz
    Hello, I know I've solved this problem before, but I can't remember or find the solution, so here I am... In Firefox 3.5 this code causes an undesirable blue border around the image. How do I get rid of this blue border? <a style="text-decoration: none;" href="index.html"> <img src="http://www.google.com/logos/stpatricksday10-hp.gif" /> </a> http://jsbin.com/umuzo3

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  • how to use @ in python.. and the @property

    - by zjm1126
    this is my code: def a(): print 'sss' @a() def b(): print 'aaa' b() and the Traceback is: sss Traceback (most recent call last): File "D:\zjm_code\a.py", line 8, in <module> @a() TypeError: 'NoneType' object is not callable so how to use the '@' thanks updated class a: @property def b(x): print 'sss' aa=a() print aa.b it print : sss None how to use @property thanks

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  • "Forwarding" keypresses from an applet to a JFrame

    - by hansengel
    I have a JFrame which contains a JApplet. There are shortcut keys that I have configured for the JFrame that work fine when the focus is on some panel of it, but once I click into the applet, none of the shortcut keys work anymore. Is there any way that I can forward these key presses to the JFrame so that the events are still fired?

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  • Hide command button on word doc

    - by d daly
    Hi I have a .doc with a command button (cmdStart) which opens a form. After populating the form I click a button to close the form and populate the .doc. I want to hide the initial cmdStart on the .doc as well when the form closes, Ive tries document.shapes(1).visible=false and cmdStart.visible=false but none seems to work. Any ideas? thanks (ps I cant just opne the form from the autonew, I need the cmdStart visible to begin with)

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  • Old query String hard coded 301 url redirection using htaccess

    - by Nilesh Toshniwal
    I have recently changed CMS of my website and now looking to redirect old urls like: oldpage.php?key=7cdb93c26 to some new urls but I want all of them in hard coded way and it should be a 301 redirect I tried the following rules but none of them work for me redirect 301 /oldpage.php?key=7cdb93c26 http://www.mynewsite.com/my-new-page.html redirect 301 "/oldpage.php?key=7cdb93c26" http://www.mynewsite.com/my-new-page.html RewriteRule ^oldpage.php?key=7cdb93c26$ http://www.mynewsite.com/my-new-page.html [L,R=301] RewriteRule ^oldpage.php?key=7cdb93c26$ /my-new-page.html [L,R=301]

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  • Erlang Facebook Example

    - by werg
    Does anyone know of an example facebook app (or facebook connect app) done in Erlang? I'm looking for something that includes the whole process. Specifically I don't seem to find anything on user authentication. I've checked out erlang_facebook, erlang2facebook and erlyface but none of them seem to offer a simple and comprehensive example accessible to me as a beginner . I'd be happy for just a bit of code to plough through though, preferably using mochiweb as backend.

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  • My login controller doesn't work. Problem with fetching username.

    - by misterwebz
    Currently my login controller doesn't work because i can't seem to fetch the username and password. I'm currently using something like this: form_username = str(request.params.get('username')) db_user = meta.Session.query(User).filter_by(username=form_username) if db_user is None: return redirect('auth/error') No matter which username is use, db_user always returns True and thus never goes to auth/error. I used the shell to play with this and i was able establish a connection with the database, so i'm not sure what i'm doing wrong here.

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  • How to check if an element is really visible with javascript.

    - by Macha
    In javascript, how would you check if an object is actually visible. I don't just mean checking the visibility and display attributes. I mean, checking that the element is not visibility:hidden or display:none underneath another element scrolled off the edge of the screen. EDIT: For technical reasons, I can't include any scripts. I can however use prototype as it is on the page already. EDIT 2: This is no longer neccesary, but I'd still find an answer interesting)

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  • C#, how to create an XML document from an object?

    - by JL
    I have the following variable that accepts a file name: var xtr = new XmlTextReader(xmlFileName) { WhitespaceHandling = WhitespaceHandling.None }; var xd = new XmlDocument(); xd.Load(xtr); I would like to change it so that I can pass in an object. I don't want to have to serialize the object to file first. Is this possible?

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  • Perl: Printing without a newline

    - by synapz
    I have a computationally expensive task in perl, and would like to inform the user that computation is ongoing by printing out a period after each portion of the computation is completed. Unfortunately, until I print a "\n", none of my periods are printed. How can I address this?

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  • Setting 0/1-to-1 relationship in SQLAlchemy?

    - by Timmy
    is there a proper way of setting up a 0/1-to-1 relationship? i want to be able to check if the related item exists without creating it: if item.relationship is None: item.relationship = item2() but it creates the insert statements on the if statement

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  • .NET allocations profiling

    - by nimoraca
    I need a way to track all allocations in a .NET application that happen during a single step in the process of debugging my application. I mean, when I'm in the debugger, stepping through code, I would like to see for a single step what allocation took place. Is there a tool or a way to do it? I tried several memory profilers including CLR profiler, JetBrains and .NET Memory Profiler 3.5 and none of them seems to provide this kind of funcionality.

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  • how to make DIV show up on top of other Divs

    - by feelexit
    I upload my code on jsFiddle, you can see it there. http://jsfiddle.net/SrT2U/2/ When you click on the link, the hidden FAQ section will show up, and it will push other divs down. But that is not what I want, I need all other divs stay where they are, and my hidden FAQ section just float on the top. Not sure how to do it. Not even sure if this should be done in HTML, CSS or jQuery. My jQuery code: $(function(){ $(".OpenTopMessage").click(function () { $("#details").slideToggle("slow"); }); }); HTML code: <div style="border: 1px solid #000;"> <span>link</span> <span>&nbsp;&nbsp;|&nbsp;&nbsp;</span> <span>link</span> <span>&nbsp;&nbsp;|&nbsp;&nbsp;</span> <span>link</span> <span>&nbsp;&nbsp;|&nbsp;&nbsp;</span> <span>link</span> <span>&nbsp;&nbsp;|&nbsp;&nbsp;</span> <span>link</span> <span>&nbsp;&nbsp;|&nbsp;&nbsp;</span> </div> <div id="faqBox"> <table width="100%"> <tr><td><a href="#" id="openFAQ" class="OpenTopMessage">this is hte faq section</a></td> </tr> </table> <div id="details" style="display:none"> <br/><br/><br/><br/><br/><br/><br/><br/> the display style property is set to none to ensure that the element no longer affects the layout of the page <br/><br/><br/><br/><br/><br/><br/><br/> </div> </div> <br/><br/> <div style="background:#c00;">other stuff heren the height reaches 0 after a hiding animation, the display style property is set to </div>

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  • P=NP?-Problem: What are the most promising methods?

    - by phimuemue
    Hello everybody, I know that P=NP has not been solved up to now, but can anybody tell me something about the following: What are currently the most promising mathematical / computer scientific methods that could be helpful to tackle this problem? Or are there even none such methods known to be potentially helpful up to now? Is there any (free) compendium on this topic where I can find all / most of the research done in this area?

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