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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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  • 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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  • 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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  • Converting higher bit rate songs to 128 kbps AAC

    - by danny wilson
    i was updating my ipod classic tonight when for some stupid reason i checked the box which says "convert higher bit rate to 128 kbps aac". straight away it changed my audio amount from 67gb to 79gb and then started to sync, i stopped it right away as i thought the whole reason was to reduce space not add anymore to it. everytime i try to sync up now it keeps going back to try this same task and i dont know how to stop it apart from the obvious and cancelling the sync but then i cant update my ipod then? anybody got any ideas for me please? thanks in advance.

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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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  • using trickle to slow down browser

    - by tester
    according to trickle's man page, http://linux.die.net/man/1/trickle i can limit the download speed of a process, e.g. trickle -u 10 -d 20 ncftp to Launch ncftp(1) limiting its upload capacity to 10 KB/s, and download capacity at 20 KB/s. how would I go about limiting google-chrome or firefox with trickle? Edit: For those of you asking why I asked such an obvious question, I tried trickle -u 10 -d 20 firefox and I'm getting an error trickle: Could not reach trickled, working independently: No such file or directory firefox opens right after, but is definitely not rate limited...

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  • Option and command keys in Mac OS X are swapped and keyboard preferences do not set them back.

    - by bikesandcode
    On my MacBook Pro, I occasionally use external keyboards, generally Windows ones and things have been fine. Yesterday, I plugged in a new one, remapped the command/option keys so the windows/alt keys were in the same configuration, again, nothing new here. However, this time when I unplugged the USB keyboard, the laptops option/command keys remained switched. More annoying is that if I go into the System Preferences - Keyboards - Modifier keys, remapping the keys to actions does not work. I can use the drop downs to disable any specific keys, but switching the behaviours does nothing. (Cmd/Option obvious, tried remapping anything to caps lock and a few other combinations, no joy. Restore defaults set the configuration to what I'd expect, but the settings are evidently ignored.) So: Any ideas?

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  • Windows File Checksums - Is my system hacked?

    - by rism
    I would like to know if there is a utility to verify the checksums of every windows file on my Win 7 Ultimate system. It seems on the surface such an obvious utility but I dont ever remember seeing one? I had a very weird experience while surfing earlier today and now Im not entirely sure my system is secure. I have a collection of tools in the WSCC suite but these tools no doubt just make system calls to the win32 api and if that has been subverted then the tools are practically useless. How do I know my Win 7 files are actually Win 7 files? I am particularly interested in verifying the integrity of all network TCP/IP files.

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  • What are the recognized ways to increase the size of the RAID array online/offline?

    - by user149509
    Is it possible, in theory, increase the size of the RAID-array of any level just by adding new drive(s)? Variant like "backup whole data - delete old array - add/replace disks - create new array - restore data" is obvious so what are the other options? Does it depend on the RAID-level only or on the implementation of RAID-controller only, or on both? Adding new disks to a striped array necessarily leads to a rebuilding of the array with the redistribution of the strips to the new drives? What steps should be done to increase size of RAID-array in online/offline scenarios? Especially interesting RAID-5 and RAID-10. I would like to see the big picture.

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  • Created a new zone in DNS manager - can't get site bindings to work in iis 7

    - by nick gowdy
    Firstly I would like to say that I am a noob when it comes to DNS, I am a web developer and I am trying to setup an intranet site for a charity. I have windows server 2008 and I installed both iis 7 and dns manager. In IIS I have this binding that works - Type: http:// IP Address: 192.168.1.9 Port: 80 Host name: My host name is empty and when I try to navigate to this website on the network, the http code is 200 and the page renders. Now if I try Host name of test.organization.intranet Internet explorer says "Internet Explorer cannot display the webpage" and the server response is aborted. In DNS manager I created a new forward lookup zone of organization.intranet I did this through the configure a dns server wizard and I created a host (A) with the same IP as the one being used in IIS. The full Host name is test.organization.intranet but it doesn't work. Maybe I am missing something obvious because it's not an area of IT that I know very well, but I am stuck for why I can't get it to work.

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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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  • 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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  • 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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  • 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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  • 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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  • 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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  • 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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  • Nonblocking io webserver/framework for java

    - by SeekingNonblockingIo
    Does anyone know of any node.js style webserver framework for java? I realized that having nonblocking callback behavior while handling a web request will require deep support at the webserver level. I am interested in node.js, but when I have a web server that ends up persisting data, I would like to take advantage of the static type system that Java offers. However, I want the scalability of non-blocking io.

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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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  • Apache: Stealth 404 the admin area until authenticated via basic auth, then allow access

    - by Kzqai
    Given a administrative area with urls like this: wp-admin/ wp-admin/whatever wp-admin/another-page wp-adminsecretlogin/ A standard basic-auth coverage would provide a username and password prompt on all three urls, and return a 403 on all failed auth attempts. This is a pretty obvious signal that something exists there, and thus is an invitation to script/brute force access. I would like to instead, require basic auth everywhere, but when not authenticated, not prompt for username and password, and instead return a 404 not found error for all urls except a wp-adminsecretlogin/ url. At that individual-to-the-site url, basic auth could go through, and unlock the rest of the administrative functionality (though the standard application login would still be necessary). How would I do that via apache .htaccess or .conf directives?

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  • Learn as much as possible about the setup behind a website.

    - by carrier
    Let's say I'm in the process of planning the setup of a website. I study similar sites that offer similar services or might receive similar traffic model. Is there a way to determine a bit the kind of setup, software and/or hardware. Some things are obvious. If I see .php or .jsp then I already know a bit. But any ideas on how to decipher more? Maybe where the site is hosted, hardware, platforms...

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