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How to test if a string is JSON or not?
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Read the second paragraph that starts with "JSON is built on two structures..." @ json.org or 4th and 5th paragraphs of ecma-international.org/publications/files/ECMA-ST/ECMA-404.pdf
– Onur Yıldırım
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Find location of a removable SD card
... scan additional SD cards and add them to the media provider and give apps read-only access to their files (which is also still supported in the platform today).
Android 4.4 is the first release of the platform that has actually allowed applications to use SD cards for storage. Any access to them p...
How to compare strings in Bash
...you want to do something when they don't match, replace = with !=. You can read more about string operations and arithmetic operations in their respective documentation.
Why do we use quotes around $x?
You want the quotes around $x, because if it is empty, your Bash script encounters a syntax erro...
Enum type constraints in C# [duplicate]
...(k))
Console.WriteLine(" {0} same as {1} Or {2}: {3} ", IO.FileAccess.ReadWrite, IO.FileAccess.Read, IO.FileAccess.Write, _
Enums.HasFlags(IO.FileAccess.ReadWrite, IO.FileAccess.Read Or IO.FileAccess.Write))
' These fail to compile as expected:
'Console.WriteLine(...
Why is “import *” bad?
...rted and can't easily find from which module a certain thing was imported (readability).
Because you can't use cool tools like pyflakes to statically detect errors in your code.
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What's a monitor in Java?
...nism to control concurrent access to an object.
This allows you to do:
Thread 1:
public void a()
{
synchronized(someObject) {
// do something (1)
}
}
Thread 2:
public void b()
{
synchronized(someObject) {
// do something else (2)
}
}
This prevents Threads 1 an...
Printing a variable memory address in swift
...s some Pointer Types that can be used when interacting with C, and you can read about them here: Swift Pointer Types
Moreover, you can understand more about them exploring their declaration (cmd+click on the type), to understand how to convert a type of pointer into another
var aString : NSStri...
How to delete and replace last line in the terminal using bash?
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echo a carriage return with \r
seq 1 1000000 | while read i; do echo -en "\r$i"; done
from man echo:
-n do not output the trailing newline
-e enable interpretation of backslash escapes
\r carriage return
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How to send a JSON object over Request with Android?
...TP Client. Here's a code sample on how to do it. You should create a new thread for network activities so as not to lock up the UI thread.
protected void sendJson(final String email, final String pwd) {
Thread t = new Thread() {
public void run() {
Looper.pr...
Origin is not allowed by Access-Control-Allow-Origin
I read about cross domain ajax requests, and understand the underlying security issue. In my case, 2 servers are running locally, and like to enable cross domain requests during testing.
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