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  • What good programming practices will change with C++0x?

    - by Jon
    For example, "Don't return objects by value if they are expensive to copy" (RVO can't always be used). This advice might change because of rvalue references. The same might be said about storing collections of pointers to objects, because copying them by value into the collection was too expensive; this reason might no longer be valid. Or the use of enums might be discouraged in favour of "enum class". What other practices or tips will change?

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  • Setting XTick or XLabels for a plot containing millisecond data

    - by Dave
    I am trying to set the X-Axis labels on a plot. I have a vector of times, these go down to the millisecond level. I have tried setting both XTick and XTickLabel properties but things are not working correctly (labels are not valid). Any suggestions on what one needs to do to get datetick to work when working with times that go down to the second/millisecond level? Are there any alternatives to using datetick? Any suggestions are appreciated.

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  • Are the ususal database performance-tuning tips invalide for a third-party app like Drupal

    - by Paul Strugger
    When you have a slow database app, the first suggestions that people make is to: Track the slow queries Add appropriate indexes In the case you are building your own application this is very logical, but when you use a CMS like Drupal, that are people have developed and tuned, is this approach valid? I mean, aren't Drupal tables already fine-tuned for performance? Even if I try to see which queries are the slow ones, what could I do about it? Re-write Drupal core?!?

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  • session fixation

    - by markiv
    Hi All, I am new to web development, and trying to get a hold on security issues. I went through this article on http://guides.rubyonrails.org/security.html these are some of the steps the author has mentioned how an attacker fixes session. 1. The attacker creates a valid session id: He loads the login page of the web application where he wants to fix the session, and takes the session id in the cookie from the response (see number 1 and 2 in the image). 2. He possibly maintains the session. Expiring sessions, for example every 20 minutes, greatly reduces the time-frame for attack. Therefore he accesses the web application from time to time in order to keep the session alive. 3. Now the attacker will force the user’s browser into using this session id (see number 3 in the image). As you may not change a cookie of another domain (because of the same origin policy), the attacker has to run a JavaScript from the domain of the target web application. Injecting the JavaScript code into the application by XSS accomplishes this attack. Here is an example: <script>?document.cookie="_session_id=16d5b78abb28e3d6206b60f22a03c8d9";?</script>. Read more about XSS and injection later on. 4. The attacker lures the victim to the infected page with the JavaScript code. By viewing the page, the victim’s browser will change the session id to the trap session id. 5. As the new trap session is unused, the web application will require the user to authenticate. 6. From now on, the victim and the attacker will co-use the web application with the same session: The session became valid and the victim didn’t notice the attack. I dont understand couple of points. i) why is user made to login in step5, since session is sent through. ii) I saw possible solutions on wiki, like user properties check and others why cant we just reset the session for the user whoever is login in when they enter username and password in step5? Thanks in advance Markiv

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  • C++ operator[ ] on integer litteral

    - by gregseth
    I found this piece of code: char a = 1["ABC"]; A few quick test led me to the fact it was the same than writing: char a = "ABC"[1]; Which seems far more logical to me. So my questions: Why is this notation valid? Is there any reason to write something that way?

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  • PHP rsa gePublicKey from .pem file

    - by mazheruddin
    Trying to verify received signature with following code. $file = "C:\key_file.pem"; $keypair = Crypt_RSA_KeyPair::fromPEMString(file_get_contents($file)); $public_key = $keypair->getPublicKey(); $rsa_pub_key = Crypt_RSA_Key::fromString($public_key->toString()); $rsa_obj = new Crypt_RSA; $verify_status = $rsa_obj->validateSign($text,$recieved_signed_sign, $rsa_pub_key) ? 'valid' : 'invalid'; getting error as Fatal error: Call to undefined method PEAR_Error::getPublicKey() in C:\Program Files\xxxx\rsa.php

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  • Validation library for PHP/mysql

    - by Industrial
    Hi! Is there any lightweight validation library available for PHP that easily can check if a specific string or value is valid for a known database type - Something like this: if (is_MEDIUMINT($var)) { $this->db->insert($anothervar); } Thanks!

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  • Why does isNaN(123.) return false?

    - by vivekraman
    Hi, Why does the Javascript function call isNaN(123.) return false? Is this a universally acceptable number or will it cause errors downstream? I'm validating whether a value is a valid decimal using isNaN along with split. Are there cross-browser issues with isNaN? Should I use a bespoke implementation? Thanks.

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  • Java syntax of +

    - by Pindatjuh
    Why is the following syntax correct: x = y+++y; (Where it means y++ + y or y + ++y which both mean y * 2 + 1) But this is not valid syntax: x = y+++++y; (Which should mean y++ + ++y, which must mean y and increase y and then add ++y which increases y thus y * 2 + 2) Is there a reason for this?

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  • folder deleting not working

    - by user1150440
    If System.IO.Directory.Exists(HttpContext.Current.Server.MapPath(Server.MapPath("images/TravelogueGallery/" & getMaxID()))) Then System.IO.Directory.Delete(HttpContext.Current.Server.MapPath("images/TravelogueGallery/" & getMaxID()), True) End If I am using the above code snippet to delete a directory but i get this error "'G:\Projects\Latest\LTCIndia 05-04-12 1415\images\TravelogueGallery\19' is not a valid virtual path. " Whats wrong with the code?

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  • Regular Expression Fails

    - by Meander365
    Anyone help? When I run this I get " invalid quantifier ?<=href= " var aHrefMatch = new RegExp("(?<=href\=")[^]+?(?=")"); var matchedLink = mystring.match(aHrefMatch); But I know the regular expression is valid. Any ideas?

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  • Accessing JAR resources

    - by Pablo Fernandez
    I have a jar file with resources (mainly configuration for caches, logging, etc) that I want to distribute. I'm having a problem with the relative paths for those resources, so I did what I've found in another stackoverflow question, which said that this was a valid way: ClassInTheSamePackageOfTheResource.class.getResourceAsStream('resource.xml'); Sadly this does not work. Any ideas? Thanks! PS: Obviously I cannot use absolute paths, and I'd like to avoid environment variables if possible

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  • getJSON callback not firing

    - by Marty Trenouth
    I'm making the call using the following script which is called on click of an anchor tag function GetToken(videoId) { debugger; var json = $.getJSON("/Vod/RequestAccessToken/"+videoId, function(result){ alert("token recieved: " + result.token); }); } In the server application I recieve the call so I know it is a valid URL, but the callback is not being invoked. If i set though the jquery code (f11/f10) the callback is called??!!!?

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  • temp. download links (with codeigniter)

    - by Ayrton
    Hi everyone I was wondering how I could start generating temporarily download links based on files from a protected directory (e.g. /downloads/). These links need to be valid until someone used it 5 times or so or after a week or so, after that the link shouldn't be accessible anymore. Any help would be appreciated.

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  • Cancel the calculation if input-mismatch was found

    - by Lert Pianapitham
    Hallo everybody, i have programmed a sub procedure, that will be called in the main procedure (called by event of mainForm), to valid the inputs before the main calculation. now i'm searching for a method, how can i cancel the calculation and refocus the mainForm if some inputs mismatch. i think, it's unnecessary to use the Try-Catch statment to trap the error from calculation because i know what is its source and it should be prevented due to the code preformance. Has someone an idea to due with this? best regards Lert Pianapitham

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