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What is the difference between -viewWillAppear: and -viewDidAppear:?

... In general, this is what I do: 1) ViewDidLoad - Whenever I'm adding controls to a view that should appear together with the view, right away, I put it in the ViewDidLoad method. Basically this method is called whenever the v...
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Unloading classes in java?

...ustom class loader so that a desktop application can dynamically start loading classes from an AppServer I need to talk to. We did this since the amount of jars that are required to do this are ridiculous (if we wanted to ship them). We also have version problems if we don't load the classes dynamic...
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When should one use HTML entities?

This has been confusing me for some time. With the advent of UTF-8 as the de-facto standard in web development I'm not sure in which situations I'm supposed to use the HTML entities and for which ones should I just use the UTF-8 character. For example, ...
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Sending email with attachments from C#, attachments arrive as Part 1.2 in Thunderbird

...n which emails out Excel spreadsheet reports via an Exchange 2007 server using SMTP. These arrive fine for Outlook users, but for Thunderbird and Blackberry users the attachments have been renamed as "Part 1.2". ...
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Sending a mail from a linux shell script

I want to send an email from a Linux Shell script. What is the standard command to do this and do I need to set up any special server names? ...
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.gitignore after commit [duplicate]

I have a git repository hosted on Github. After committing many files, I am realizing that I need to create .gitignore and exclude .exe , .obj files. ...
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How to tell if a file is git tracked (by shell exit code)?

Is there a way to tell if a file is being tracked by running some git command and checking its exit code? 8 Answers ...
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Are inline virtual functions really a non-sense?

I got this question when I received a code review comment saying virtual functions need not be inline. 13 Answers ...
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Use email address as primary key?

Is email address a bad candidate for primary when compared to auto incrementing numbers? 25 Answers ...
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WebSockets protocol vs HTTP

... the WebSockets protocol better? WebSockets is better for situations that involve low-latency communication especially for low latency for client to server messages. For server to client data you can get fairly low latency using long-held connections and chunked transfer. However, this doesn't help...