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boundingRectWithSize for NSAttributedString returning wrong size
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Attention! It does not always work! Sometimes the returned width is larger than the width of the size parameter. Even Apples method documentation states: "The constraints you specify in the size parameter are a guide for the renderer for how to size the string. How...
Faster s3 bucket duplication
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It supports non-concurrent sync based on file modified time, size, etc. It was blazing fast when I tried it. I believe the objects are copied directly on S3 without downloading them to the local machine. It doesn't run in parallel by default but I'm sure you could have multiple s...
How does password salt help against a rainbow table attack?
...pting to crack the password.
A public salt does two things: makes it more time-consuming to crack a large list of passwords, and makes it infeasible to use a rainbow table.
To understand the first one, imagine a single password file that contains hundreds of usernames and passwords. Without a salt...
Convert a python dict to a string and back
...ngs like this. Being (relatively) human readable is a BIG plus much of the time.
– Tyler Eaves
Dec 28 '10 at 16:17
31
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Can you have multiline HTML5 placeholder text in a ?
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No longer works in Chrome - for a long time now, I'd assume.
– Mike Rockétt
Feb 22 '17 at 14:08
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How to verify if a file exists in a batch file?
... If no date is given, copies only those files whose
source time is newer than the destination time.
/H Copies hidden and system files also.
/E Copies directories and subdirectories, including empty ones.
Same as /S /E. May be used to modify /T.
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Getting HTTP code in PHP using curl
...ck to check server side. For example, doing this first could save a lot of time:
if(!$url || !is_string($url) || ! preg_match('/^http(s)?:\/\/[a-z0-9-]+(.[a-z0-9-]+)*(:[0-9]+)?(\/.*)?$/i', $url)){
return false;
}
Make sure you only fetch the headers, not the body content:
@curl_setopt($ch, C...
How can I open multiple files using “with open” in Python?
I want to change a couple of files at one time, iff I can write to all of them. I'm wondering if I somehow can combine the multiple open calls with the with statement:
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How to check if an email address exists without sending an email?
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There are two methods you can sometimes use to determine if a recipient actually exists:
You can connect to the server, and issue a VRFY command. Very few servers support this command, but it is intended for exactly this. If the server responds with a 2.0.0...
How to get the text node of an element?
...ing two small numbers is better than comparing strings of various lengths (time and space considerations). The correct question to ask in this situation is "what kind / type of node do I have?", and not "what name do I have?" developer.mozilla.org/en-US/docs/Web/API/Node/nodeType
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