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iOS app error - Can't add self as subview

... I am speculating based on something similar that I debugged recently... if you push (or pop) a view controller with Animated:YES it doesn't complete right away, and bad things happen if you do another push or pop before the animation completes. You can ...
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How to extract text from a PDF? [closed]

Can anyone recommend a library/API for extracting the text and images from a PDF? We need to be able to get at text that is contained in pre-known regions of the document, so the API will need to give us positional information of each element on the page. ...
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How to check size of a file using Bash?

...he output format, you can also look at stat. On Linux, you'd start with something like stat -c '%s' file.txt, and on BSD/Mac OS X, something like stat -f '%z' file.txt. share | improve this answer ...
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How to vertically center divs? [duplicate]

I'm trying to make a small username and password input box. 17 Answers 17 ...
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How to add an Access-Control-Allow-Origin header

...1.com,http://site2.com (Multiple values are not supported in current implementations) share | improve this answer | follow | ...
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How can I transform string to UTF-8 in C#?

...String = Encoding.UTF8.GetString(bytes); Another thing you may have to remember: If you are using Console.WriteLine to output some strings, then you should also write Console.OutputEncoding = System.Text.Encoding.UTF8;!!! Or all utf8 strings will be outputed as gbk... ...
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What is an example of the simplest possible Socket.io example?

...en trying to understand Socket.io lately, but I am not a supergreat programmer, and almost every example I can find on the web (believe me I have looked for hours and hours), has extra stuff that complicates things. A lot of the examples do a bunch of things that confuse me, or connect to some weird...
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Log all queries in mysql

Is it possible for me to turn on audit logging on my mysql database? 10 Answers 10 ...
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How to create a cron job using Bash automatically without the interactive editor?

Does crontab have an argument for creating cron jobs without using the editor (crontab -e). If so, What would be the code create a cronjob from a Bash script? ...
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Getting value of select (dropdown) before change

... previous = this.value; }).change(function() { // Do something with the previous value after the change alert(previous); // Make sure the previous value is updated previous = this.value; }); })(); Working example: http://jsfiddle.net/x5PKf/766 ...