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  • When to retain a "delegate"

    - by Jose
    I know that in Objective-C you should never retain your delegates because it may cause a retain-cycle, however, how do you know the difference between a delegate and a non-delegate object ? Can't it be said that just sending a message to any object is delegating work to that object ?

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  • read Number from text file using CPP stream

    - by Yongwei Xing
    Hi all I have a text file like below 2 1 2 5 10 13 11 12 14 2 0 1 2 99 2 200 2 1 5 5 1 2 3 4 5 1 0 0 0 I want to read file line by line, and read the umbers from each line. I know how to use the stream to read a fixed field line, but what about the non-fixed line? Best Regards,

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  • How can I disable a model field in a django form

    - by jammon
    I have a model like this: class MyModel(models.Model): REGULAR = 1 PREMIUM = 2 STATUS_CHOICES = ((REGULAR, "regular"), (PREMIUM, "premium")) name = models.CharField(max_length=30) status = models.IntegerField(choices = STATUS_CHOICES, default = REGULAR) class MyForm(forms.ModelForm): class Meta: model = models.MyModel In a view I initialize one field and try to make it non-editable: myform = MyForm(initial = {'status': requested_status}) myform.fields['status'].editable = False But the user can still change that field. What's the real way to accomplish what I'm after?

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  • .htaccess: subdomain issue

    - by Oden
    Hey, How can i redirect a subdomain call to a folder? So when the site, sub.domain.com is requested I want to redirect it to show the content of domain.com/sub/ The server is configured to add every request to the domain, but i get a 404 page everytime i do a non-defined subdomain call (witch is trivial, because theres nothing defined) So the question is: How to solve this, with .htaccess?

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  • In App Purchase with Subscription Model

    - by Evangelist
    Does anyone have any idea of a service provider that provides In App Purchase with subscription model. I checked Urban Airship which has solution built around non-consumable approach and iLime is not available yet. Any pointers in the right direction would be appreciated.

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  • Is ctrl-s save universal for save or are there different combinations for different languages

    - by aepheus
    I imagine that there are different combination, just looking for an affirmation. Or, are we developers really that english-centric? If I were in japan, using a word processor on some computer, would ctrl-s save? Are there keyboards where ctrl-s doesn't even exist (non-english keyboards)? Most of what I've seen usually has latin + [insert language here] characters, usually overridden on the normal qwerty keyboard.

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  • How to recognize external hard drive from all local drives in .NET Framework?

    - by biajee
    I've already tried System.IO.DriveType. But it only provides to me with the information of whether it's a removable drive such as floppy disc or a USB flash drive. And a USB external hard drive will be recognized as a local non-removable drive in this case. Furthermore, since there are more than one kinds of external hard drive, for example, USB and IEEE 1394. It's really hard to figure it out from ports. Any information will be appreciated.

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  • C++ error message output format

    - by sub
    If I want to trigger an error in my interpreter I call this function: Error( ErrorType type, ErrorSeverity severity, const char* msg, int line ); However, with that I can only output Name error: Undefined variable in line 1 instead of Name error: Undefined variable 'someVariableName' in line 1 I'm working entirely with strings (except for the error messages as they all are constant at the moment), so sprintf won't work. What is the best way to create an efficient error function that can output a constant message combined with a string that describes which object, e.g.: a non-existing variable, triggered the error?

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  • when to make a method static

    - by Don
    Hi, I'd like to know how people decide whether to define a method as static. I'm aware that a method can only be defined as static if it doesn't require access to instance fields. So lets say we have a method that does not access instance fields, do you always define such a method as static, or only if you need to call it statically (without a reference to an instance). Perhaps another way of asking the same question, is whether you use static or non-static as the default? Thanks, Don

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  • Return reference from class to this.

    - by Thomas
    Hi, I have the following member of class foo. foo &foo::bar() { return this; } But I am getting compiler errors. What stupid thing am I doing wrong? Compiler error (gcc): error: invalid initialization of non-const reference of type 'foo&' from a temporary of type 'foo* const'

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  • JBoss database connection pool configuration

    - by Qben
    I am facing an connection pool issue in my clustered JBoss installation. From time to time one of my connection pools will hit the roof and I get a lot of these in my logfile. java.sql.SQLException: No ManagedConnections available within configured blocking timeout ( 30000 [ms] ); The odd thing is that I can see in the JMX console that the ConnectionCount hit the roof, but at the same time InUseConnectionCount is often quite small. The problem will resolve itself after a couple of minutes but during recovery phase my application will not work (for obvious reasons). The question is if this indicate an error in the configured timeouts of the connections (I pretty much use defaults), or if my pool is simply too small to handle the peaks. Under normal operation I would say I use ~40% of the configured max number of connections. The reason I just don't increase the max number of connection is that if I actually used up all connections I suspect that InUseConnectionCount would hit the roof. Hence I suspect I might have more issues than just a too small pool size. Maybe InUseConnectionCount has decreased at the time I check jmx-console and it actually do hit the roof? I tend to collect data every second minute. Any hints are more than welcome.

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  • Looking for a CSS Parser in java

    - by Richard
    Hi, I'm looking for a CSS Parser in java. In particular my requirement is, for a given node/element in an HTML document, to be able to ask/get the css styles for that element from the Parser. I know there is the W3C SAC interface and one or 2 implementations based on this - but turorials/examples appear non-existant. Any help/points in rigth direction much appreciated. Thanks

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  • Logging communication between two VMs

    - by sYnfo
    Hi, I'm trying to set up "malware lab" described in this paper. So far, I've set up Windows guest system, adding one Host-only Network adapter, and setting this (sorry if the names aren't exactely correct, I don't have an english language version): - IP Address - 10.0.0.3 - Subnet mask - 255.255.255.0 - Default gateway - not set - Preferred DNS - 10.0.0.4 - Alternate DNS - not set And a Linux guest system - Ubuntu 9.04 - with two Network adapters - Bridged (eth0) and Host-only (eth1), and setting eth1 IP Address to 10.0.0.4, leaving the eth0 to be set by DHCP. Then, I have configured iptables as described in the paper, ie.: iptables -F -t nat iptables -F -t mangle iptables -t mangle -P PREROUTING ACCEPT iptables -t mangle -P OUTPUT ACCEPT iptables -t nat -P PREROUTING ACCEPT iptables -t nat -P POSTROUTING ACCEPT iptables -t nat -P OUTPUT ACCEPT iptables -t mangle -A PREROUTING -i eth0 -j ACCEPT iptables -t mangle -A PREROUTING -p udp -i eth1 -d 10.0.0.3 --dport 53 -j ACCEPT iptables -t mangle -A PREROUTING -p tcp -i eth1 --dport 80 -j ACCEPT iptables -t mangle -A PREROUTING -p tcp -i eth1 -d 10.0.0.3 --dport 6000:7000 -j ACCEPT iptables -t mangle -A PREROUTING -i eth1 -j ULOG iptables -t mangle -A PREROUTING -i eth1 -j DROP Now, when I try to ping the windows system from within the Linux system, it does not reply, I guess thats perfectly normal, because iptables is blocking ping responce. Same when I try to ping the Linux system from within the Windows. But when I try to access any web page from within the Windows system, I would expect that this action should get logged by iptables. But thing is, I don't see any of that kind of lines in log file (If I am looking in the right place, that is. :) It is at /var/log/messages, isn't it?). So, what do you think might be the problem here? I should note, that this is the first time I'm using linux, so don't expect ANY working knowledge of Linux at all... :) Also, since english is not my mother tongue, feel free to point out any gramatical mistakes... :) Thanks for any advice.

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  • What is the fastest / best Base64 en/decoder for Java ?

    - by mP
    Just found the MIG Base 64 utility but its over 6 years old since its last release. It would appear to be quicker than the Apache commons equivalent but I have yet to confirm by writing up an actual test. Has anyone verified its correctness which is always a worry. If someone takes a look at the methods, please note i a referring to the non fast methods which make assumptions trading possible correctness for pure speed.

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  • [Smarty] Looking for variables which aren't assigned.

    - by Kel
    What could happen if my template looks for variables which weren't assigned? For example: var uwfs_id = '{$tpl_uwfs_id}'; This snippet is from my javascript code. I outputted the value and it is simply empty. I know I could use isset(). But I couldn't find anything about how Smarty handles non-existing variables. So, what happens if template can't find a variable, because it wasn't assigned?

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  • Getting the System tick count with basic C++?

    - by Donal Rafferty
    I essentially want to reconstruct the getTickCount() windows function so I can use it in basic C++ without any non standard libraries or even the STL. (So it complies with the libraries supplied with the Android NDK) I have looked at clock() localtime time But I'm still unsure whether it is possible to replicate the getTickCount windows function with the time library. Can anyone point me in the right direction as to how to do this or even if its possible?

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  • XSD validation error human readable

    - by Robert
    Hi, I want to be able to validate a XML against a XSD and generate user readable errors, for example, including XSD documentation tag. I just wanted to know if C# provides this in a easy, elegant and non-painful way, otherwise I'll parse down the error and find the node within XSD.

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  • Log files legal aspect?

    - by relwarc
    I like data. That is why I add a standalone PHP script which logs all relevant HTTP variables like: Date of visit IP User-agent Request URI Referer Am I allowed to store all this in non-public text files? Am I allowed to evaluate the data? What am I allowed to do with the log files? Do I have to delete them after some time?

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  • Then files in my project folder used for what?

    - by william-hu
    I finished one project. But others want me give them the non-Compiled code.what's that? My project folder include: Classes:of course, the source code. build: I don't understand clearly. imagesrc: I added, include the images of my project. The others are the nib file. Give me the explanation in detail,thank you so much.

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  • Why exactly do we use NoSQL?

    - by Tian H.
    Having understood some of the advantages that NoSQL offers (scalability, availability, etc.), I am still not clear why a website would want to use a non-relational database. Can I get some help on this, preferably with an example?

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  • Get Caret Position within an Text Input field

    - by MarkB29
    How could can I get the caret position from within an input field. I have seen a few bits and pieces on google but nothing bullet proof. Basically something like a Jquery plugin would be ideal so I could simply do $("#myinput").caretPosition() I realise there may by other non-jQuery solutions and these would also be brilliant if anyone has any??

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