In this example, we use this database:
"your-project-name" : {
"users" : {
"randomUserId1" : {
"display-name" : "John Doe",
"gender" : "male"
}
"randomUserId2" :...
Note: You need to know which data referenced by getReference() first before you can completely understand this example.
There are three common method to get your data from Firebase Realtime Database:
addValueEventListener()
addListenerForSingleValueEvent()
addChildEventListener()
When w...
Step 1 - installing VirtualBox
Download and install VirtualBox according to your operating system. , it is required to run Genymotion.
Step 2 - downloading Genymotion
Go to the Genymotion download page and download Genymotion according to your operating system.
Note: you will need to create a ...
Many developers have this problem when they work on huge projects, especially if they work on some modular CMS on plugins, addons, components etc. Here is solution for safe session start where if first checked PHP version to cover all versions and on next is checked if session is started. If session...
Throwable has two direct subclasses, Exception and Error. While it's possible to create a new class that extends Throwable directly, this is inadvisable as many applications assume only Exception and Error exist.
More to the point there is no practical benefit to directly subclassing Throwable, as ...
If developers want to test Google Maps or any other Google service like Gmail,Youtube, Google drive etc. then they first need to install Google framework on Genymotion. Here are the steps:-
4.4 Kitkat
5.0 Lollipop
5.1 Lollipop
6.0 Marshmallow
7.0 Nougat
7.1 Nougat (webview patch)
Download fro...
A namespace can be given an alias (i.e., another name for the same namespace) using the namespace identifier = syntax. Members of the aliased namespace can be accessed by qualifying them with the name of the alias. In the following example, the nested namespace AReallyLongName::AnotherReallyLongNam...
Call this function with parameter argument as array with type 'any'. It will return you json string. Json string is used to submit array in web service call as request input parameter in Swift.
//-----------------------
let array = [["one" : 1], ["two" : 2], ["three" ...
# not all of this is required, but just here for reference
bl_info = {
"name": "Hello World", # name of the add-on
"author": "Blender developer", # name of the author
"version": (1, 0), ...
You can install ImageMagick from source or Binary.
In case of Windows Binary
Download executable binary file. And simply click on the appropriate version and it will launch itself and follow the wizard.
You can type the following command to find out whether ImageMagick is successfully installed o...
Using the magick command (or `convert for IM 6.x users) you con convert any image format to any other. with no other arguments, as little processing as possible will be done to move from one format to the other. Simply specify your input and output files. To convert a JPEG to a PNG:
$ magick image....
This example demonstrate how to dynamically insert data into MySQL using Python Scrapy.
You do not need to edit pipelines.py file for any project.
This example can be used for all your project.
Just yield you_data_dictionary from your Spider and inside pipelines.py a query will be created automat...
Enable pipelines in your settings.py
ITEM_PIPELINES = {
'project_folder.pipelines.MyPipeline': 100
}
Then write this code in items.py
# -*- coding: utf-8 -*-
from scrapy import Item, Field
from collections import OrderedDict
class DynamicItem(Item):
def __setitem__(self, key, v...
Create a new Xamarin Forms app using PCL File -> New Solution -> Multiplatform App -> Xamarin Forms -> Forms App; Name the project as EffectsDemo
Under the iOS project, add a new Effect class that inherits from PlatformEffect class and overrides the methods OnAttached, OnDetached and ...
There may be multiple reason why you want to create a text file in batch.
But whatever the reason may be, this is how you do it.
If you want to overwrite an existing text file use >.
Example:
@echo off
echo info to save > text.txt
But if you want to append text to an already existing t...
You may want to copy files from one place to another. In this example we'll teach you.
You can use the command xcopy. The syntax is xcopy c:\From C:\To
Example:
@echo off
xcopy C:\Folder\text.txt C:\User\Username\Desktop
There are also switches you can use. If you want to view them open up co...
