Tutorial by Examples: ch

To check exact strength in decibels use this- ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE); NetworkInfo Info = cm.getActiveNetworkInfo(); if (Info == null || !Info.isConnectedOrConnecting()) { Log.i(TAG, "No connection");...

Set up some constants for the server and authentication information. Assuming LDAPv3, but it's easy enough to change that. // Authentication, and the name of the server. private const string LDAPUser = "cn=example:app:mygroup:accts,ou=Applications,dc=example,dc=com"; private readonly ch...

The change the definition of a db column, the query below can be used for example, if we have this db schema users ( firstname varchar(20), lastname varchar(20), age char(2) ) To change the type of age column from char to int, we use the query below: ALTER TABLE users CHANGE age...

EXEC sp_configure "number of checkpoint tasks", 4

This will rollback both inserts due to an invalid datetime: BEGIN TRANSACTION BEGIN TRY INSERT INTO dbo.Sale(Price, SaleDate, Quantity) VALUES (5.2, GETDATE(), 1) INSERT INTO dbo.Sale(Price, SaleDate, Quantity) VALUES (5.2, 'not a date', 1) COMMIT TRANSACTION END TRY BEG...

If you know you need a packet <packet>, but you don't know the exact name <packet-exact-name>, instead of searching with Google try with the following: sudo apt-get update apt-cache search <packet> This will return you a list of packets name with a description. Once you have i...

This tutorial will guide you through the process from scratch. Please note some preliminary notes about this particular setup, useful in case that you already have some requested package: Is needed a version of php >=5.0 (I had troubles with php 7.0) Is requested any version of perl Is need...

When we want to handle array of data, its better to use async.each. When we want to perform something with all data & want to get the final callback once everything is done, then this method will be useful. This is handled in parallel way. function createUser(userName, callback) { //creat...

The regexp command is used to match a regular expression against a string. # This is a very simplistic e-mail matcher. # e-mail addresses are extremely complicated to match properly. # there is no guarantee that this regex will properly match e-mail addresses. set mydata "send mail to john....

You may use this command for listing the files for your own debuggable apk: adb shell run-as <sample.package.id> ls /data/data/sample.package.id/cache And this script for pulling from cache, this copy the content to sdcard first, pull and then remove it at the end: #!/bin/sh adb shell &q...

CHAR(n) is a string of a fixed length of n characters. If it is CHARACTER SET utf8mb4, that means it occupies exactly 4*n bytes, regardless of what text is in it. Most use cases for CHAR(n) involve strings that contain English characters, hence should be CHARACTER SET ascii. (latin1 will do just ...

Often you want to match an expression only in specific places (leaving them untouched in others, that is). Consider the following sentence: An apple a day keeps the doctor away (I eat an apple everyday). Here the "apple" occurs twice which can be solved with so called backtracking cont...

According to the C++ standard, The switch statement causes control to be transferred to one of several statements depending on the value of a condition. The keyword switch is followed by a parenthesized condition and a block, which may contain case labels and an optional default label. When t...

The catch keyword introduces an exception handler, that is, a block into which control will be transferred when an exception of compatible type is thrown. The catch keyword is followed by a parenthesized exception declaration, which is similar in form to a function parameter declaration: the paramet...

An integer type which is "large enough to store any member of the implementation’s basic character set". It is implementation-defined whether char is signed (and has a range of at least -127 to +127, inclusive) or unsigned (and has a range of at least 0 to 255, inclusive). const char zer...

C++11 An unsigned integer type with the same size and alignment as uint_least16_t, which is therefore large enough to hold a UTF-16 code unit. const char16_t message[] = u"你好，世界\n"; // Chinese for "hello, world\n" std::cout << sizeof(message)/sizeof(char16_t) ...

C++11 An unsigned integer type with the same size and alignment as uint_least32_t, which is therefore large enough to hold a UTF-32 code unit. const char32_t full_house[] = U"🂣🂳🂨🂸🃈"; // non-BMP characters std::cout << sizeof(full_house)/sizeof(char32_t) <<...

In the Adobe technical white paper Adobe Acrobat 9 Digital Signatures, Changes and Improvements, especially its section "Allowed and disallowed changes", Adobe clarifies the allowed changes (as seen by Acrobat 9 and up) that can be made to a certified or signed document without invalidatin...

The following code is taken from he official AutoHotkey documentation: Function implementation: #Persistent OnClipboardChange("ClipChanged") return ClipChanged(Type) { ToolTip Clipboard data type: %Type% Sleep 1000 ToolTip ; Turn off the tip. } Label implementati...

Some character may be reserved for HTML and cannot be used directly as it may obstruct the actual HTML codes. For example, trying to display the left and right angle brackets (<>) in the source code may cause unexpected results in the output. Similarly, white spaces as written in the source co...