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for each loop in Objective-C for accessing NSMutable dictionary
...
for (NSString* key in xyz) {
id value = xyz[key];
// do stuff
}
This works for every class that conforms to the NSFastEnumeration protocol (available on 10.5+ and iOS), though NSDictionary is one of the few collections which lets you enumerate keys...
Why would an Enum implement an Interface?
...ple here is wrong, since Enum already implements that. You can't even override it.
A better example is having an interface that defines, let's say, a data type. You can have an enum to implement the simple types, and have normal classes to implement complicated types:
interface DataType {
// met...
Tuning nginx worker_process to obtain 100k hits per min
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Use worker_rlimit_nofile but one should also call 'ulimit -n' to set the open file count value per process. This is better done in the init script.
– Ethan
May 19 '13 at 20:53
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Boolean literals in PowerShell
... coerces to a boolean value, if the type has to be boolean, e.g. in method calls that require boolean (and have no conflicting overload), or conditional statements. Most non-null objects are true, for example. null, empty strings, empty arrays and the number 0 are false.
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Rails 3 migrations: Adding reference column?
...gration AddUserRefToProducts user:references
like you can see on rails guides
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UITextField - capture return button event
...;
return NO;
}
When enter button is clicked then this delegate method is called.you can capture return button from this delegate method.
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Undo VS 'Exclude from project'?
...e showing all files. There is a button at the top of the Solution Explorer called "Show All Files". To see this button, make sure that your project is selected in the solution explorer.
Show All Files
When this option is active, the file should be there, just grayed out. Right click it, and selec...
how to restart only certain processes using supervisorctl?
...ervisor.rpcinterface:make_main_rpcinterface
supervisorctl command can be called with a group name:
supervisorctl restart foo:
as well as with multiple process names:
supervisorctl restart foo:cat1 cat2
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How to express a One-To-Many relationship in Django
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In Django, a one-to-many relationship is called ForeignKey. It only works in one direction, however, so rather than having a number attribute of class Dude you will need
class Dude(models.Model):
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class PhoneNumber(models.Model):
dude = models.ForeignKe...
转：postfix安装Q&A - 更多技术 - 清泛网 - 专注C/C++及内核技术
... SYS_MYSQL_SOCKET = /tmp/mysql.sock
QUOTE:
Q：
Can't call method "prepare" on an undefined value at /usr/local/httpd/htdocs/extman/libs/Ext/Mgr/MySQL.pm line 59.
A:
在mysql.pm里将RaiseError => 0 改为1 这个是打开mysql更多的出错提示。
QUOTE:...