Difference between SIP and SIPS URI?
I am reading SIP RFC 3261. I didn’t get the difference between sip uri and sips uri. Can Some one help.
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“unrecognized selector sent to instance” error in Objective-C
It looks like you’re not memory managing the view controller properly and it is being deallocated at some point – which causes the numberButtonClicked: method to be sent to another object that is now occupying the memory that the view controller was previously occupying… Make sure you’re properly retaining/releasing your view controller.
Using $this when not in object context in PHP
You are not inside instance of class to use $this. Try this, it will work
When do I use the PHP constant “PHP_EOL”?
Yes, PHP_EOL is ostensibly used to find the newline character in a cross-platform-compatible way, so it handles DOS/Unix issues. Note that PHP_EOL represents the endline character for the current system. For instance, it will not find a Windows endline when executed on a unix-like system.
How to concatenate two MP4 files using FFmpeg?
I ended up using mpg as the intermediate format and it worked (NOTE this is a dangerous example, -qscale 0 will re-encode the video…)
What is the difference between allFile and allMarkdownRemark in gatsby
It always depends on your filesystem and how it is set up. The short answer is that allFile retrieves all kind of files (images, markdowns, JSONs, etc) set in your gatsby-source-filesystem while allMarkdownRemark only fetches the markdown files because a transformer plugin has previously created a specific node to do so. allMarkdownRemark, of course, is more specific and has better performance, … Read more
Assembly’s manifest definition does not match assembly reference
Here’s how I managed to solve it: Go to the solution explorer and choose Antlr under References, right-click and say properties. Make sure the file version is the same the compiler is looking for. In my case, MSBuild wanted version 5.5.0.2, but the reference properties showed an earlier 2.x version. All I had to do is go … Read more
How to UPSERT (MERGE, INSERT … ON DUPLICATE UPDATE) in PostgreSQL?
9.5 and newer: PostgreSQL 9.5 and newer support INSERT … ON CONFLICT (key) DO UPDATE (and ON CONFLICT (key) DO NOTHING), i.e. upsert. Comparison with ON DUPLICATE KEY UPDATE. Quick explanation. For usage see the manual – specifically the conflict_action clause in the syntax diagram, and the explanatory text. Unlike the solutions for 9.4 and older that are given below, this feature works with … Read more
Does != have meaning in OCaml?
you have experienced the difference between structural and physical equality. <> is to = (structural equality) as != is to == (physical equality) is false because each is instantiated in different memory locations, doing: Most of the time you’ll want to use = and <>. edit about when structural and physical equality are equivalent: You can use the what_is_it function and find out all the types that … Read more