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  • Would a pointer to a pointer to nil match against NULL?

    - by dontWatchMyProfile
    Example: A validation method contains this check to see if an NSError object shall be created or not: - (BOOL)validateCompanyName:(NSString *)newName error:(NSError **)outError { if (outError != NULL) { // do it... Now I pass an NSError object, like this: NSError *error = nil; BOOL ok = [self validateCompanyName:@"Apple" error:&error]; I'm not sure if this matches the check for not NULL. I think it's not NULL, since I believe NULL is not nil. Maybe someone can clear this up?

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  • Python references

    - by hekevintran
    Can someone explain why the example with integers results in different values for x and y and the example with the list results in x and y being the same object? x = 42 y = x x = x + 1 print x # 43 print y # 42 x = [ 1, 2, 3 ] y = x x[0] = 4 print x # [4, 2, 3] print y # [4, 2, 3] x is y # True

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  • When Something Occurs in a BackgroundWorker, Trigger Code on a Different Thread?

    - by Soo
    I have a background worker that runs and looks for stuff, and when it finds stuff, I want to update my main WinForm. The issue that I'm having is that when I try to update my WinForm from my background worker, I get errors that tell me I can't modify things that were made outside of my background worker (in other words, everything in my form). Can someone provide a simple code example of how I can get my code to work the way I want it to? Thanks!

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  • XML Import how would you do it?

    - by Rico
    XML is used as one of our main integration points. it comes over by many clients at a time but too many clients importing at the same time can slow down our database to a crawl. Someone has to have solved a problem like this. I am basically using VB to parse through the data and import what i want and don't want. Is there a better way?

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  • How can I limit user bandwidth usage?

    - by Scarface
    Ok, I have a site, and it serves all images and mp3s through a php script and can be controlled and limited, but I am now worried about overall bandwidth of my site. For example, what if someone just sends a million requests to one of my pages? Does anyone have any suggestions into server methods used to prevent this? Should I use mod_cband http://www.howtoforge.com/mod_cband_apache2_bandwidth_quota_throttling_p2?

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  • Retrieve all hashtags from a tweet in a PHP function

    - by snorpey
    Hi. I want to retrieve all hashtags from a tweet using a PHP function. I know someone asked a similar question here, but there is no hint how exactly to implement this in PHP. Since I'm not very familiar with regular expressions, don't know how to write a function that returns an array of all hashtags in a tweet. So how do I do this, using the following regular expression: #\S*\w

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  • Is there better documentation then the original OpenAL docs? [closed]

    - by mystify
    OpenAL is such a huge thing, and the documentation doesn't tell what values are acceptable for properties. That's really bad. I'm using the document: "OpenAL_Programmers_Guide.pdf" Whenever I look up a property I'm left in the dark what value might be ok. For example, take AL_PITCH. What value? Maybe someone wrote a better one? Or is there something like a wiki place with more details?

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  • parseInt('07')=='7', but parseInt('08')=='0'? why?

    - by KOHb
    Here's a simple script that gives a strange result: alert(parseInt('01')+' - '+parseInt('02')+' - '+parseInt('03')+' - '+parseInt('04')+' - '+parseInt('05')+' - '+parseInt('06')+' - '+parseInt('07')+' - '+parseInt('08')+' - '+parseInt('09')+' - '+parseInt('10')); I would expect it to give 1 - 2 - 3 and so on, but it gives me this (in FireFox, Chrome and IE6): 1 - 2 - 3 - 4 - 5 - 6 - 7 - 0 - 0 - 10 Can someone please explain me why?

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  • How do I understand the 3 lines batch script?

    - by Runner
    ECHO @ECHO OFF ^& (IF EXIST "%%~dp0%~n1.swf" (DEL "%%~dp0%~n1.swf")) ^& %mxmlcPath% %opts% -file-specs "%%~dp0%~nx1" ^& (IF EXIST "%%~dp0%~n1.swf" (CALL "%%~dp0%~n1.swf") ELSE (PAUSE)) > "%~dpn1.bat" REM Immediately execute the generated bat @ECHO on CALL "%~dpn1.bat" It's really a mess for me(like ECHO @ECHO OFF,what's that intended for?), can someone elaborate it?

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  • Why Isn't My .Net Object Serializable?

    - by Rob P.
    I've got a 'MyDataTable' class that inherits from System.Data.DataTable I've implemented ISerializable in my class and have a 'Public Overrides Sub GetObjectData...' But when I try to serialize the an object of 'MyDataTable' I get an error saying that 'MyDataTable' is not marked as serializable. If I used a DataTable instead - my code serializes correctly. If I add a serializable attribute to the 'MyDataTable' class - it serializes correctly, but I'm told that is unnecessary if I implement ISerializable. Can someone point me in the right direction?

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  • CouchDB in-place updates

    - by Jason
    Hi http://wiki.apache.org/couchdb/Document_Update_Handlers CouchDB ( 0.10 and above ) supports in-place updates now. I'm having trouble understanding how it works. I tried to use the example provided but I couldn't get it to work. Can someone provide some examples and uris used to access the in-place updates. Thanks

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  • Should I use "User Defined Functions" in SQL server, or C#?

    - by sanity
    I have a fairly complicated mathematical function that I've been advised should be implemented as a User Defined Function in SQL Server so that it can be used efficiently from within a SQL query. The problem is that it must be very efficient as it may be executed thousands of times per second, and I subsequently heard that UDFs are very inefficient. Someone suggested that I could implement the function in C# instead, and that this would be much more efficient. What should I do?

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  • Hibernate query cache automatically refreshed on external update?

    - by artgon
    I'm creating a service that has read-only access to the database. I have a query cache and a second level cache enabled (READ_ONLY mode) in Hibernate to speed up the service, as the tables being accessed change rarely. My question is, if someone goes into the DB and changes the tables manually (i.e. outside of Hibernate), does the cache recognize automatically that it needs to be cleared? Is there a time limit on the cache?

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  • How is this site opening a new window

    - by user217428
    Normally we can specify a target in the link or use javascript window.open to open a new window. But when I access this site www.wenxuecity.com (It is a chinese site) I could't find out how it opens each news in a new window. no target in the link. debug javascript doesn't show any call to window.open Could someone tell me how it is implemented? Thanks

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  • Do compiled PHP scripts exist?

    - by dabito
    Hi, I am wondering if anyone has used or read about PHP scripts compiled as a .so extension for Apache... Thing is I think I remember reading about it somewhere but dont know if such a thing exists. This looks promising, but incomplete and abandoned: http://phpcompiler.org/ Im interested because i think it could improve performance... Perhaps someone could point out a framework or apache extension that does this. Thanks!!

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  • What is the use of different types of function call in js?

    - by sparrow
    I have seen different type of js function call like function aTestFunction(param) { // function body } and also: aTestFunction = function(param) { // function body } what is the difference in above to implementaion? Also, i found that jquery/prototype js framework uses the second implementation in most cases. Is there any special reason for that? Sorry, I am a novice so this question may be silly to someone but will be helpful me if any guru out there helps me with this silly question. Thanks in advance.

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  • Regular Expression - Block Spam

    - by Immanuel
    Could someone lead me on finding a regular expression that blocks a comma separated list of Spam words I already have? The regular expression needs to match a string with the spam word list I already have. Not that it matters, but I am using PHP.

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  • For a Chemical Equation Balancer App (Android), how do I count the number of atoms of each element in each term?

    - by Upas
    This is my app: If someone enters "C6H12O6+O2=CO2+H2O", then I have already written code to split the equation into terms, so in an ArrayList called rterms I have the strings: C6H12O6 CO2 and in another ArrayList called pterms, I have: CO2 H2O I need to count the number of C's in each term of the reactants, so 6 for term 1, 0 for term 2, and then the H's and then O's. How would I do this? Any help is appreciated.

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