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  • Const parameter at constructor causes stackoverflow

    - by Luca
    I've found this strange behavior with VS2005 C++ compiler. Here is the situation: I cannot publish the code, but situation is very simple. Here is initial code: it work perfectly class Foo { public: Foo(Bar &bar) { ... } } The constructor implementation stores a reference, setup some members... indeed nothing special. If I change the code in the following way: class Foo { public: Foo(const Bar &bar) { ... } } I've added a const qualifier to the only constructor routine parameter. It compiles correctly, but the compiler outputs a warning saying that the routine Foo::Foo will cause a stackoverflow (even if the execution path doesn't construct any object Foo); effectively this happens. So, why the code without the const parameter works perfectly, while the one with the const qualifier causes a stackoverflow? What can cause this strange behavior?

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  • How to give a custom ASP.NET control the ability to parse XML markup to a collection?

    - by Vilx-
    I'm writing a custom ASP.NET webcontrol and would like it to have a collection of custom items which can also be specified in the XML markup. Something like this: class MyControl: WebControl { public IList<MyItemType> MyItems { get; private set; } } And in the markup: <asd:MyControl runat="server" id="mc1"> <MyItems> <MyDerivedCustomItem asd="dsa"/> <MyOtherDerivedCustomItem asd="dsa"/> </MyItems> </asd:MyControl> How do I do this? I though this was all about implementing some interface on the collection or adding some special attributes to the property, but nothing I do seems to work.

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  • How to Embed Image in Outlook Signature?

    - by BlackMael
    Is it possible to create an HTML email signature for Outlook 2003 or above that doesn't reference external images? That is, using those special "cid" reference but embed the image itself in the signature and not on the file system or network. This is for an web application that generates a "standard" email signature based on various input from a user. It has worked fine so far with a single "embedded" image. But a new feature is going to require the possible addition of multiple tiny images. Getting to user to save one email signature template and one image to the user's machine is about the limit of what I'd like to require of the user. But forcing the user to save multiple images seem to be pushing things a little to far in my opinion. So my problem is trying to embed the images into without having to inconvenience the user with multiple downloads first.

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  • platform independent and open source

    - by Lukas Schmelzeisen
    Hey, OK i want to start writing platform independent and open source code (mostly C++). What do i have to consider when doing so? Stop using IDEs and better use makefiles from now on? What do all the "professional" open source coders do (like the guys behind GNU) and what tools do they use? I'm special interested into developing shared libraries. How do you get the cross platform (so working as ".so" on Linux and as ".dll" on Windows)? I'm working on Windows so I'm not that much into all the Linux tools and words, are there good tools to get the same result on Windows as on ?Linux Thanks

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  • jquery $(window).width() and $(window).height() return different values when viewport has not been r

    - by Manca Weeks
    I am writing a site using jquery that repeatedly repeatedly calls $(window).width() and $(window).height() to position and size elements based on the viewport size... In troubleshooting I discovered that I am getting slightly different viewport size reports in repeated calls to the above jquery functions when the viewport is not resized... Wondering if there is any special case anyone knows of when this happens, or if this is just the way it is. The difference in sizes reported are 20px or less, it appears. It happens in Safari 4.0.4, Firefox 3.6.2 and Chrome 5.0.342.7 beta on Mac OS X 10.6.2... I didn't test other browsers yet because it doesn't appear to be specific to the browser. I was also unable to figure out what the difference depends upon - if it isn't the viewport size, could there be another factor that makes the results differ? Any insight would be appreciated... Thanks MAnca

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  • ResultSet and aggregation

    - by kachanov
    Ok, I admit my situation is special There is a data system that supports SQL-92 and JDBC interface However the SQL requets are pretty expensive, and in my application I need to retreive the same data multiple times and aggregate it ("group by") on different fields to show different dimensions of the same data. For example on one screen I have three tables that show the same set or records but aggregated by City (1st grid), by Population (2nd grid), by number of babies (3rd grid) This amounts to 3 SQL queries (which is very slow), UNLESS anyone of you can suggest any idea any library from apache commons or from google code, so that I can select all records into ResultSet and get 3 arrays of data group by different fields from this single ResultSet. Am I'm missing some obvious and unexpected solution to this problem?

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  • How to call an event when the user "finally" selects an item in a list?

    - by herzmeister der welten
    When a user clicks once on an item in a Grid or a ListBox, that item is usually selected, hence most UI frameworks have a onSelected event or the like for that. However, how can we generally call the next step when a user "finally" selects an item by e.g. double clicking an entry? You know when some popup might appear in the context of the selected item and the user can do further stuff. Strangely enough, I think I have never seen a word for that in any UI framework. onPicked, onAccepted, onChosen, onFinallySelected, onResult? All kinda awkward or too special. Any other ideas?

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  • Why does the token returned by LogonUser() in Win x64 not belong to LOCAL group?

    - by edwinbs
    Hi, I have a piece of code that calls LogonUser() followed by CreateProcessAsUser(). In Win32, the resulting process belongs to a user (say, TESTDOMAIN\user1) who belongs to the LOCAL group. However, in x64, the process owner does not belong to LOCAL. The owner still belongs to all other groups (Authenticated Users, Everyone, etc.) Does anyone know if this is a documented behavior change? Or am I supposed to put some special flag in x64 when calling LogonUser()? Thanks.

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  • AES acceleration for Java

    - by chris_l
    I want to encrypt/decrypt lots of small (2-10kB) pieces of data. The performance is ok for now: On a Core2Duo, I get about 90 MBytes/s AES256 (when using 2 threads). But I may need to improve that in the future - or at least reduce the impact on the CPU. Is it possible to use dedicated AES encryption hardware with Java (using JCE, or maybe a different API)? Would Java take advantage of special CPU features (SSE5?!), if I get a better CPU? Or are there faster JCE providers? (I tried SunJCE and BouncyCastle - no big difference.) Other possiblilities?

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  • What is it about Fibonacci numbers?

    - by Ian Bishop
    Fibonacci numbers have become a popular introduction to recursion for Computer Science students and there's a strong argument that they persist within nature. For these reasons, many of us are familiar with them. They also exist within Computer Science elsewhere too; in surprisingly efficient data structures and algorithms based upon the sequence. There are two main examples that come to mind: Fibonacci heaps which have better amortized running time than binomial heaps. Fibonacci search which shares O(log N) running time with binary search on an ordered array. Is there some special property of these numbers that gives them an advantage over other numerical sequences? Is it a density quality? What other possible applications could they have? It seems strange to me as there are many natural number sequences that occur in other recursive problems, but I've never seen a Catalan heap.

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  • What, if any, is wrong with this definition of letrec in Scheme?

    - by Lajla
    R5RS gives proposed macro definitions for library forms of syntax: http://schemers.org/Documents/Standards/R5RS/HTML/r5rs-Z-H-10.html#%_sec_7.3 Which also defines letrec, in a very complicated way, certainly not how I would define it, I would simply use: (define-syntax letrec2 (syntax-rules () ((letrec2 ((name val) ...) body bodies ...) ((lambda () (define name val) ... body bodies ...))))) As far as I understand the semantics of letrec, which I use very often as a named let. It works in this way, however as I've had my fair share of debates with philosophers who think they can just disprove special relativity or established phonological theories, I know that when you think you have a simple solution to a complex problem, it's probably WRONG. There has got to be some point where this macro does not satify the semantics of letrec else they'd probably have used it. In this definition, the definitions are local to the body of the letrec, they can refer to each other for mutual recursion, I'm not quite sure what (if any) is wrong.

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  • How to handle right to left languages in Flash (pre version 10)?

    - by Maan Ashgar
    Hello, We are currently working with Flex creating a web application. We are having trouble taking Arabic text from the user and displaying correctly (like in a chat feature). While presumably Flash 10 will solve this problem, we don't want to force our users to upgrade. Flash flips the order of the sentence's words. so if I wrote something like "Hello World" in the text field, it will appear as "World Hello" in the chat area. Is there a standard way to work with Right to Left languages in Flash? *We currently flip the order of the words with a function, but it things get messed up when using English or special characters in the chat like :) or :D *

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  • Non-string role names in ASP.NET MVC?

    - by MikeWyatt
    ASP.NET MVC has good support for role-based security, but the usage of strings as role names is maddening, simply because they cannot be strongly-typed as enumerations. For example, I have an "Admin" role in my app. The "Admin" string will now exist in the Authorize attribute of my action, in my master page (for hiding a tab), in my database (for defining the roles available to each user), and any other place in my code or view files where I need to perform special logic for admin or non-admin users. Is there a better solution, short of writing my own authorization attribute and filter, that would perhaps deal with a collection of enumeration values?

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  • How to split Chinese characters one by one?

    - by Nano HE
    Hi If there is no special character(such as white space, : etc) between firstname and lastname. Then how to split the Chinese characters below. use strict; use warnings; use Data::Dumper; my $fh = \*DATA; my $fname; # ? ; my $lname; # ??; while(my $name = <$fh>) { $name =~ ??? ; print $fname"/n"; print $lname; } __DATA__ ??? Output ? ??

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  • How are Flash library symbols constructed? Why are width/height already available in constructor?

    - by Triynko
    Suppose I draw a square on the stage, convert it to a symbol, export it for ActionScript with a classname of "MySquare" (and of course a base class of MovieClip). How is it that in the MySquare constructor, the width and height of this MovieClip are already available? In fact, any named instances in the clip are also available. I'm confused about how the Flash player seems to be able to pre-construct my movie clip by populating its properties and child clips before my constructor for the class ever runs. I thought that it would have to first construct the clip, calling my constructor code, and then construct and add any children, but obviously the player is doing something special for clips designed in the Flash authoring environment.

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  • Sex appeal of computer graphics: movie like UI systems [closed]

    - by anon
    It's well know that 1) the way computers actually work 2) the way computers are protrayed in movies are not the same. In particular (2) looks much much cooler than (1). Where can I learn more about making flashy, superficially useful but deepdown useless fancy graphics UIs like that? It's almost in the realm of "hollywood special effects" -- like fire/smoke/fire, but I don't want natural phenomenon; I want user interfaces. Concrete question: where can I learn about creating flashy, cool looking (though not necessairly useful) user interfaces? [Perferably in OpenGL]

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  • Strange behavior of for loop in scheduler_tick

    - by EpsilonVector
    I'm working on Linux kernel 2.4 (homework) and I inserted the following code into the scheduler_tick function: if (unlikely(rt_task(p)) || (p->policy==SCHED_PROD && p->time_ran>=p->process_expected_time)) { /* * RR tasks need a special form of timeslice management. * FIFO tasks have no timeslices. */ if ((p->policy == SCHED_RR || /*change*/p->policy==SCHED_PROD) && !--p->time_slice) { /*changes*/ if (p->policy == SCHED_PROD){ for (i=0; i<5000; i++){ printk("I'm leeching off SCHED_RR code! %d\n", i); } } /*end changes*/ The addition was added for debugging purposes. For some reason this causes very weird behavior: when a SCHED_PROD process triggers this code (and consequently the loop that follows) the loop counts to about 4600 normally, but then goes back to 4600 each time it counts to 4800, and gets stuck in an infinite loop. What's going on?? EDIT: The i variable is my own.

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  • How can I make my tableview enter editing mode?

    - by Jake
    Hi, for some reason I can't get my tableview to enter editing mode. It's a little harder than it might seem because I'm using some open source code to make a calendar (iCal esque) with a tableview under it, and it's not quite as straightforward as just using a regular tableview. Basically, I have two classes. One (let's say Class A) is a UIViewController and the other (Class B) is that viewController's datasource and tableview delegate. In Class B, I've implemented -(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath; which works fine, but if I put an edit nav bar item in Class A (the view controller), nothing happens. Am I forgetting certain protocols, or certain special methods that I need to write? Thanks for any help, and apologies if I'm missing something, I'm just learning to work with other people's code.

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  • is there a specialized educational institution in enterprise software design ?

    - by dfafa
    Is a software engineering degree sufficient for being able to design efficient code in enterprise architecture ? I mean that's what I want to do, some people go to game schools (Vancouver Film School) to make games or work in that industry. are there such similar programs for enterprise software design/development ? Are there special courses in Java EE space and .NET ? is it suitable to just focus on java or both ? My ultimate goal would be consulting and developing enterprise software independently....but right now, I am starting school and just keep learning on the side. any guidance to resources on this industry would be appreciated or your insights. Thank you.

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  • Apache rewrite_mod: RewriteRule path and query string

    - by 1ace
    I currently have a website with a standard web interface on index.php, and I made an iPhone-friendly version in iphone.php. Both pages handle the same arguments. It works fine when I manually go to .../iphone.php, but I'd like to rewrite anything on .../path/ and .../path/index.php to iphone.php if %{HTTP_USER_AGENT} contains mobile, and optionally add the query string (not sure if/when I'd need to add it). So far, this is what I have in my .../path/.htaccess: RewriteEngine On RewriteCond %{HTTP_USER_AGENT} ^.+mobile.+$ [NC] RewriteRule index.php?(.*) iphone.php?$1 [L] RewriteRule index.php iphone.php [L] The problems are, it matches index.php in any subfolder, and it won't match .../path/?args… Special thanks to anyone who can correct/simplify/optimize anything =)

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  • Is it safe to catch EXCEPTION_GUARD_PAGE

    - by Michael J
    Environment is VC++ 9 on various Win platforms (XP and later) I'm writing an unhandled exception handler. I have a vague recollection from my kernel days that it was bad to catch an EXCEPTION_GUARD_PAGE, as this was generated to tell the OS to enlarge the stack. My question is twofold: Can such an exception occur in user space? If so, is it safe to catch it? I'm not especially interested in doing anything with it. I just want to know if I need to put special code in to not catch it (as I'm catching everything at the moment).

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  • Cant see images on print preview

    - by Viren
    I been ask to lay a page where user can click on print option to print that page All the code is hooked up the print command works with one exception the images on web page arent getting reflected in print preview . there isnt any special stylesheet applied for printing to be specific the page has no stylesheet The code for print is given below <a href="javascript:window.print()">Print</a> Attaching the screenshot of the page And the print preview page for better understanding Note : Each images along with qrcode code is render using iframe so what you in web page contain 2 iframe each row to display qrode along with images of a products

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  • illegal charcters in facebook graph api

    - by user1465888
    i was trying to get how many facebook likes an url got, through facebook graph api. to get the likes i need to get the content from this url: http://graph.facebook.com/?id=URL for example, try to get into this url: "graph.facebook.com/?id=http://stackoverflow.com" you will see how many "shares" the url got. shares is the sum of shares and likes, so every thing was working good when i was trying to this. the problem start when i use special charcters. when i using the "?" charcter everything work okey. but when i use "&" charcter the url cuts itself. try this: "graph.facebook.com/?id=http://stackoverflow.com?p=blabla&a=fsdf" you can see in this page that the id actullay cut itself when it get to the "&" charcter and the page ends like this: { "id": "http://stackoverflow.com?p=blabla" } sorry for my bad english...

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  • How can I convert Perl regular expressions to boost regular expressions?

    - by YY
    I'm not familiar with Perl and boost regular expression and I want to convert a Perl code to c++. I want to convert special regular expression in Perl into c++ using Boost regexp library. Please help me understand what I must do? Here is some regexps that a word of a sentence may match: if ($word =~ /^[\.:\,()\'\`-]/) { # hack for punctuation } if ($word =~ /^[A-Z]/) { return; } if ($word =~ /[A-Za-z0-9]+\-[A-Za-z0-9]+/) { # all hyphenated words return; } if ($word =~ /.*[0-9].*/) { # all numbers return; }

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  • Got blue screen with a warning that I boot loader may not be properly configured, workaround?

    - by JohnHF
    After running sudo apt-get update got this message: Configuring grub-pc You chose not to install GRUB to any devices. If you continue, the boot loader may not be properly configured, and when your computer next starts up it will use whatever was previously in the boot sector. If there is an earlier version of GRUB 2 in the boot sector, it may be unable to load modules or handle the current configuration file. If you are already running a different boot loader and want to carry on doing so, or if this is a special environment where you do not need a boot loader, then you should continue anyway. Otherwise, you should install GRUB somewhere. Continue without installing GRUB? <Yes> <No> Apparently there is a bug in ubuntu 10.04. But this hang the system. Any ideas on how to fix this? All I wanted was to install gcc that is missing.

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