How to use background thread in swift?
Good answers though, anyway I want to share my Object Oriented solution Up to date for swift 5.
please check it out: AsyncTask
Conceptually inspired by android's AsyncTask, I've wrote my own class in Swift
AsyncTask enables proper and easy use of the UI thread. This class allows to perform background operations and publish results on the UI thread.
Here are few usage examples
Example 1 -
AsyncTask(backgroundTask: {(p:String)->Void in//set BGParam to String and BGResult to Void
print(p);//print the value in background thread
}).execute("Hello async");//execute with value 'Hello async'
Example 2 -
let task2=AsyncTask(beforeTask: {
print("pre execution");//print 'pre execution' before backgroundTask
},backgroundTask:{(p:Int)->String in//set BGParam to Int & BGResult to String
if p>0{//check if execution value is bigger than zero
return "positive"//pass String "poitive" to afterTask
}
return "negative";//otherwise pass String "negative"
}, afterTask: {(p:String) in
print(p);//print background task result
});
task2.execute(1);//execute with value 1
It has 2 generic types:
BGParam
- the type of the parameter sent to the task upon execution.
BGResult
- the type of the result of the background computation.
When you create an AsyncTask you can those types to whatever you need to pass in and out of the background task, but if you don't need those types, you can mark it as unused with just setting it to: Void
or with shorter syntax: ()
When an asynchronous task is executed, it goes through 3 steps:
beforeTask:()->Void
invoked on the UI thread just before the task is executed.
backgroundTask: (param:BGParam)->BGResult
invoked on the background thread immediately after
afterTask:(param:BGResult)->Void
invoked on the UI thread with result from the background task
How to a convert a date to a number and back again in MATLAB
Use DATESTR
>> datestr(40189)
ans =
12-Jan-0110
Unfortunately, Excel starts counting at 1-Jan-1900. Find out how to convert serial dates from Matlab to Excel by using DATENUM
>> datenum(2010,1,11)
ans =
734149
>> datenum(2010,1,11)-40189
ans =
693960
>> datestr(40189+693960)
ans =
11-Jan-2010
In other words, to convert any serial Excel date, call
datestr(excelSerialDate + 693960)
EDIT
To get the date in mm/dd/yyyy format, call datestr
with the specified format
excelSerialDate = 40189;
datestr(excelSerialDate + 693960,'mm/dd/yyyy')
ans =
01/11/2010
Also, if you want to get rid of the leading zero for the month, you can use REGEXPREP to fix things
excelSerialDate = 40189;
regexprep(datestr(excelSerialDate + 693960,'mm/dd/yyyy'),'^0','')
ans =
1/11/2010
Javascript replace with reference to matched group?
For the replacement string and the replacement pattern as specified by $
.
here a resume:
link to doc : here
"hello _there_".replace(/_(.*?)_/g, "<div>$1</div>")
Note:
If you want to have a $
in the replacement string use $$
. Same as with vscode snippet system.
JPA: How to get entity based on field value other than ID?
In my Spring Boot app I resolved a similar type of issue like this:
@Autowired
private EntityManager entityManager;
public User findByEmail(String email) {
User user = null;
Query query = entityManager.createQuery("SELECT u FROM User u WHERE u.email=:email");
query.setParameter("email", email);
try {
user = (User) query.getSingleResult();
} catch (Exception e) {
// Handle exception
}
return user;
}
How to get file_get_contents() to work with HTTPS?
TO CHECK IF AN URL IS UP OR NOT
The code in your question can be rewritten as to a working version:
function send($packet=NULL, $url) {
// Do whatever you wanted to do with $packet
// The below two lines of code will let you know if https url is up or not
$command = 'curl -k '.$url;
return exec($command, $output, $retValue);
}
What is the best way to determine a session variable is null or empty in C#?
To follow on from what others have said. I tend to have two layers:
The core layer. This is within a DLL that is added to nearly all web app projects. In this I have a SessionVars class which does the grunt work for Session state getters/setters. It contains code like the following:
public class SessionVar
{
static HttpSessionState Session
{
get
{
if (HttpContext.Current == null)
throw new ApplicationException("No Http Context, No Session to Get!");
return HttpContext.Current.Session;
}
}
public static T Get<T>(string key)
{
if (Session[key] == null)
return default(T);
else
return (T)Session[key];
}
public static void Set<T>(string key, T value)
{
Session[key] = value;
}
}
Note the generics for getting any type.
I then also add Getters/Setters for specific types, especially string since I often prefer to work with string.Empty rather than null for variables presented to Users.
e.g:
public static string GetString(string key)
{
string s = Get<string>(key);
return s == null ? string.Empty : s;
}
public static void SetString(string key, string value)
{
Set<string>(key, value);
}
And so on...
I then create wrappers to abstract that away and bring it up to the application model. For example, if we have customer details:
public class CustomerInfo
{
public string Name
{
get
{
return SessionVar.GetString("CustomerInfo_Name");
}
set
{
SessionVar.SetString("CustomerInfo_Name", value);
}
}
}
You get the idea right? :)
NOTE: Just had a thought when adding a comment to the accepted answer. Always ensure objects are serializable when storing them in Session when using a state server. It can be all too easy to try and save an object using the generics when on web farm and it go boom. I deploy on a web farm at work so added checks to my code in the core layer to see if the object is serializable, another benefit of encapsulating the Session Getters and Setters :)
How to apply a CSS filter to a background image
All you actually need is "filter":
blur(«WhatEverYouWantInPixels»);"
_x000D_
_x000D_
body {_x000D_
color: #fff;_x000D_
font-family: Helvetica, Arial, sans-serif;_x000D_
}_x000D_
_x000D_
#background {_x000D_
background-image: url('https://cdn2.geckoandfly.com/wp-content/uploads/2018/03/ios-11-3840x2160-4k-5k-beach-ocean-13655.jpg');_x000D_
background-repeat: no-repeat;_x000D_
background-size: cover;_x000D_
width: 100vw;_x000D_
height: 100vh;_x000D_
overflow: hidden;_x000D_
position: absolute;_x000D_
top: 0;_x000D_
left: 0;_x000D_
z-index: -1;_x000D_
_x000D_
/* START */_x000D_
/* START */_x000D_
/* START */_x000D_
/* START */_x000D_
_x000D_
/* You can adjust the blur-radius as you'd like */_x000D_
filter: blur(3px);_x000D_
}
_x000D_
<div id="background"></div>_x000D_
_x000D_
<p id="randomContent">Lorem Ipsum</p>
_x000D_
_x000D_
_x000D_
Java: Most efficient method to iterate over all elements in a org.w3c.dom.Document?
I also stumbled over this problem recently. Here is my solution.
I wanted to avoid recursion, so I used a while loop.
Because of the adds and removes in arbitrary places on the list,
I went with the LinkedList
implementation.
/* traverses tree starting with given node */
private static List<Node> traverse(Node n)
{
return traverse(Arrays.asList(n));
}
/* traverses tree starting with given nodes */
private static List<Node> traverse(List<Node> nodes)
{
List<Node> open = new LinkedList<Node>(nodes);
List<Node> visited = new LinkedList<Node>();
ListIterator<Node> it = open.listIterator();
while (it.hasNext() || it.hasPrevious())
{
Node unvisited;
if (it.hasNext())
unvisited = it.next();
else
unvisited = it.previous();
it.remove();
List<Node> children = getChildren(unvisited);
for (Node child : children)
it.add(child);
visited.add(unvisited);
}
return visited;
}
private static List<Node> getChildren(Node n)
{
List<Node> children = asList(n.getChildNodes());
Iterator<Node> it = children.iterator();
while (it.hasNext())
if (it.next().getNodeType() != Node.ELEMENT_NODE)
it.remove();
return children;
}
private static List<Node> asList(NodeList nodes)
{
List<Node> list = new ArrayList<Node>(nodes.getLength());
for (int i = 0, l = nodes.getLength(); i < l; i++)
list.add(nodes.item(i));
return list;
}
Javascript - Track mouse position
ES6 based code:
let handleMousemove = (event) => {
console.log(`mouse position: ${event.x}:${event.y}`);
};
document.addEventListener('mousemove', handleMousemove);
If you need throttling for mousemoving, use this:
let handleMousemove = (event) => {
console.warn(`${event.x}:${event.y}\n`);
};
let throttle = (func, delay) => {
let prev = Date.now() - delay;
return (...args) => {
let current = Date.now();
if (current - prev >= delay) {
prev = current;
func.apply(null, args);
}
}
};
// let's handle mousemoving every 500ms only
document.addEventListener('mousemove', throttle(handleMousemove, 500));
here is example
GCM with PHP (Google Cloud Messaging)
You can use this PHP library available on packagist:
https://github.com/CoreProc/gcm-php
After installing it you can do this:
$gcmClient = new GcmClient('your-gcm-api-key-here');
$message = new Message($gcmClient);
$message->addRegistrationId('xxxxxxxxxx');
$message->setData([
'title' => 'Sample Push Notification',
'message' => 'This is a test push notification using Google Cloud Messaging'
]);
try {
$response = $message->send();
// The send() method returns a Response object
print_r($response);
} catch (Exception $exception) {
echo 'uh-oh: ' . $exception->getMessage();
}
How to fix HTTP 404 on Github Pages?
I bound my domain before this problem appeared. I committed and pushed the branch gh-pages and it solved my problem. New commits force jekyll to rebuild your pages.
How to connect to my http://localhost web server from Android Emulator
Try http://10.0.2.2:8080/
where 8080
is your port number. It worked perfectly. If you just try 10.0.2.2
it won't work. You need to add port number to it. Also if Microsoft IIS has been installed try turning off that feature from control panel (if using any windows os) and then try as given above.
How to restart tomcat 6 in ubuntu
if you are using extracted tomcat then,
startup.sh
and shutdown.sh
are two script located in TOMCAT/bin/ to start and shutdown tomcat, You could use that
if tomcat is installed then
/etc/init.d/tomcat5.5 start
/etc/init.d/tomcat5.5 stop
/etc/init.d/tomcat5.5 restart
How do I get a UTC Timestamp in JavaScript?
Since new Date().toUTCString()
returns a string like "Wed, 11 Oct 2017 09:24:41 GMT"
you can slice the last 3 characters and pass the sliced string to new Date()
:
new Date()
// Wed Oct 11 2017 11:34:33 GMT+0200 (CEST)
new Date(new Date().toUTCString().slice(0, -3))
// Wed Oct 11 2017 09:34:33 GMT+0200 (CEST)
How to check whether a Button is clicked by using JavaScript
Try adding an event listener for clicks:
document.getElementById('button').addEventListener("click", function() {
alert("You clicked me");
}?);?
Using addEventListener
is probably a better idea then setting onclick
- onclick
can easily be overwritten by another piece of code.
You can use a variable to store whether or not the button has been clicked before:
var clicked = false
document.getElementById('button').addEventListener("click", function() {
clicked = true
}?);?
addEventListener on MDN
Create an array with random values
Using some new ES6 features, this can now be achieved using:
function getRandomInt(min, max) {
"use strict";
if (max < min) {
// Swap min and max
[min, max] = [min, max];
}
// Generate random number n, where min <= n <= max
let range = max - min + 1;
return Math.floor(Math.random() * range) + min;
}
let values = Array.from({length: 40}, () => getRandomInt(0, 40));
console.log(values);
Note that this solution will only work in modern browsers that support these ES6 features: arrow functions and Array.from().
Function inside a function.?
This is useful concept for recursion without static properties , reference etc:
function getRecursiveItems($id){
$allItems = array();
function getItems($parent_id){
return DB::findAll()->where('`parent_id` = $parent_id');
}
foreach(getItems($id) as $item){
$allItems = array_merge($allItems, getItems($item->id) );
}
return $allItems;
}
Remove the newline character in a list read from a file
You could actually put the newlines to good use by reading the entire file into memory as a single long string and then use them to split that into the list of grades.
with open("grades.dat") as input:
grades = [line.split(",") for line in input.read().splitlines()]
etc...
Access Tomcat Manager App from different host
Each deployed webapp has a context.xml
file that lives in
$CATALINA_BASE/conf/[enginename]/[hostname]
(conf/Catalina/localhost by default)
and has the same name as the webapp (manager.xml
in this case). If no file is present, default values are used.
So, you need to create a file conf/Catalina/localhost/manager.xml
and specify the rule you want to allow remote access. For example, the following content of manager.xml
will allow access from all machines:
<Context privileged="true" antiResourceLocking="false"
docBase="${catalina.home}/webapps/manager">
<Valve className="org.apache.catalina.valves.RemoteAddrValve" allow="^YOUR.IP.ADDRESS.HERE$" />
</Context>
Note that the allow attribute of the Valve
element is a regular expression that matches the IP address of the connecting host. So substitute your IP address for YOUR.IP.ADDRESS.HERE (or some other useful expression).
Other Valve
classes cater for other rules (e.g. RemoteHostValve
for matching host names). Earlier versions of Tomcat use a valve class org.apache.catalina.valves.RemoteIpValve for IP address matching.
Once the changes above have been made, you should be presented with an authentication dialog when accessing the manager URL. If you enter the details you have supplied in tomcat-users.xml
you should have access to the Manager.
How to instantiate a File object in JavaScript?
The idea ...To create a File object (api) in javaScript for images already present in the DOM :
<img src="../img/Products/fijRKjhudDjiokDhg1524164151.jpg">
var file = new File(['fijRKjhudDjiokDhg1524164151'],
'../img/Products/fijRKjhudDjiokDhg1524164151.jpg',
{type:'image/jpg'});
// created object file
console.log(file);
Don't do that ! ... (but I did it anyway)
-> the console give a result similar as an Object File :
File(0) {name: "fijRKjokDhgfsKtG1527053050.jpg", lastModified: 1527053530715, lastModifiedDate: Wed May 23 2018 07:32:10 GMT+0200 (Paris, Madrid (heure d’été)), webkitRelativePath: "", size: 0, …}
lastModified:1527053530715
lastModifiedDate:Wed May 23 2018 07:32:10 GMT+0200 (Paris, Madrid (heure d’été)) {}
name:"fijRKjokDhgfsKtG1527053050.jpg"
size:0
type:"image/jpg"
webkitRelativePath:""__proto__:File
But the size of the object is wrong ...
Why i need to do that ?
For example to retransmit
an image form already uploaded, during a product update, along with additional images added during the update
How to create new folder?
You probably want os.makedirs as it will create intermediate directories as well, if needed.
import os
#dir is not keyword
def makemydir(whatever):
try:
os.makedirs(whatever)
except OSError:
pass
# let exception propagate if we just can't
# cd into the specified directory
os.chdir(whatever)
What is a mixin, and why are they useful?
What separates a mixin from multiple inheritance? Is it just a matter of semantics?
A mixin is a limited form of multiple inheritance. In some languages the mechanism for adding a mixin to a class is slightly different (in terms of syntax) from that of inheritance.
In the context of Python especially, a mixin is a parent class that provides functionality to subclasses but is not intended to be instantiated itself.
What might cause you to say, "that's just multiple inheritance, not really a mixin" is if the class that might be confused for a mixin can actually be instantiated and used - so indeed it is a semantic, and very real, difference.
Example of Multiple Inheritance
This example, from the documentation, is an OrderedCounter:
class OrderedCounter(Counter, OrderedDict):
'Counter that remembers the order elements are first encountered'
def __repr__(self):
return '%s(%r)' % (self.__class__.__name__, OrderedDict(self))
def __reduce__(self):
return self.__class__, (OrderedDict(self),)
It subclasses both the Counter
and the OrderedDict
from the collections
module.
Both Counter
and OrderedDict
are intended to be instantiated and used on their own. However, by subclassing them both, we can have a counter that is ordered and reuses the code in each object.
This is a powerful way to reuse code, but it can also be problematic. If it turns out there's a bug in one of the objects, fixing it without care could create a bug in the subclass.
Example of a Mixin
Mixins are usually promoted as the way to get code reuse without potential coupling issues that cooperative multiple inheritance, like the OrderedCounter, could have. When you use mixins, you use functionality that isn't as tightly coupled to the data.
Unlike the example above, a mixin is not intended to be used on its own. It provides new or different functionality.
For example, the standard library has a couple of mixins in the socketserver
library.
Forking and threading versions of each type of server can be created
using these mix-in classes. For instance, ThreadingUDPServer is
created as follows:
class ThreadingUDPServer(ThreadingMixIn, UDPServer):
pass
The mix-in class comes first, since it overrides a method defined in
UDPServer. Setting the various attributes also changes the behavior of
the underlying server mechanism.
In this case, the mixin methods override the methods in the UDPServer
object definition to allow for concurrency.
The overridden method appears to be process_request
and it also provides another method, process_request_thread
. Here it is from the source code:
class ThreadingMixIn:
"""Mix-in class to handle each request in a new thread."""
# Decides how threads will act upon termination of the
# main process
daemon_threads = False
def process_request_thread(self, request, client_address):
"""Same as in BaseServer but as a thread.
In addition, exception handling is done here.
"""
try:
self.finish_request(request, client_address)
except Exception:
self.handle_error(request, client_address)
finally:
self.shutdown_request(request)
def process_request(self, request, client_address):
"""Start a new thread to process the request."""
t = threading.Thread(target = self.process_request_thread,
args = (request, client_address))
t.daemon = self.daemon_threads
t.start()
A Contrived Example
This is a mixin that is mostly for demonstration purposes - most objects will evolve beyond the usefulness of this repr:
class SimpleInitReprMixin(object):
"""mixin, don't instantiate - useful for classes instantiable
by keyword arguments to their __init__ method.
"""
__slots__ = () # allow subclasses to use __slots__ to prevent __dict__
def __repr__(self):
kwarg_strings = []
d = getattr(self, '__dict__', None)
if d is not None:
for k, v in d.items():
kwarg_strings.append('{k}={v}'.format(k=k, v=repr(v)))
slots = getattr(self, '__slots__', None)
if slots is not None:
for k in slots:
v = getattr(self, k, None)
kwarg_strings.append('{k}={v}'.format(k=k, v=repr(v)))
return '{name}({kwargs})'.format(
name=type(self).__name__,
kwargs=', '.join(kwarg_strings)
)
and usage would be:
class Foo(SimpleInitReprMixin): # add other mixins and/or extend another class here
__slots__ = 'foo',
def __init__(self, foo=None):
self.foo = foo
super(Foo, self).__init__()
And usage:
>>> f1 = Foo('bar')
>>> f2 = Foo()
>>> f1
Foo(foo='bar')
>>> f2
Foo(foo=None)
Creating a recursive method for Palindrome
public static boolean isPalindrome(String str)
{
int len = str.length();
int i, j;
j = len - 1;
for (i = 0; i <= (len - 1)/2; i++)
{
if (str.charAt(i) != str.charAt(j))
return false;
j--;
}
return true;
}
Is unsigned integer subtraction defined behavior?
With unsigned numbers of type unsigned int
or larger, in the absence of type conversions, a-b
is defined as yielding the unsigned number which, when added to b
, will yield a
. Conversion of a negative number to unsigned is defined as yielding the number which, when added to the sign-reversed original number, will yield zero (so converting -5 to unsigned will yield a value which, when added to 5, will yield zero).
Note that unsigned numbers smaller than unsigned int
may get promoted to type int
before the subtraction, the behavior of a-b
will depend upon the size of int
.
What is the result of % in Python?
Modulus - Divides left hand operand by right hand operand and returns remainder.
If it helps:
1:0> 2%6
=> 2
2:0> 8%6
=> 2
3:0> 2%6 == 8%6
=> true
... and so on.
Can I use Twitter Bootstrap and jQuery UI at the same time?
For future reference (since this is google's top answer ATM), to prevent jQuery UI from overriding bootstrap's or your custom style, you need to create a custom download and select the no-theme
theme. That will only include jQuery UI's resets, and not overload bootstrap's style for various elements.
While we're at it, some jQuery UI components (such as datepicker) have a native bootstrap implementation. The native bootstrap implementations will use the bootstrap css classes, attributes and layouts, so should have a better integration with the rest of the framework.
Swift: Convert enum value to String?
There are multiple ways to do this. Either you could define a function in the enum which returns the string based on the value of enum type:
enum Audience{
...
func toString()->String{
var a:String
switch self{
case .Public:
a="Public"
case .Friends:
a="Friends"
...
}
return a
}
Or you could can try this:
enum Audience:String{
case Public="Public"
case Friends="Friends"
case Private="Private"
}
And to use it:
var a:Audience=Audience.Public
println(a.toRaw())
How can I use goto in Javascript?
There is a way this can be done, but it needs to be planned carefully.
Take for example the following QBASIC program:
1 A = 1; B = 10;
10 print "A = ",A;
20 IF (A < B) THEN A = A + 1; GOTO 10
30 PRINT "That's the end."
Then create your JavaScript to initialize all variables first, followed by making an initial function call to start the ball rolling (we execute this initial function call at the end), and set up functions for every set of lines that you know will be executed in the one unit.
Follow this with the initial function call...
var a, b;
function fa(){
a = 1;
b = 10;
fb();
}
function fb(){
document.write("a = "+ a + "<br>");
fc();
}
function fc(){
if(a<b){
a++;
fb();
return;
}
else
{
document.write("That's the end.<br>");
}
}
fa();
The result in this instance is:
a = 1
a = 2
a = 3
a = 4
a = 5
a = 6
a = 7
a = 8
a = 9
a = 10
That's the end.
how to get the last part of a string before a certain character?
Difference between split and partition is split returns the list without delimiter and will split where ever it gets delimiter in string i.e.
x = 'http://test.com/lalala-134-431'
a,b,c = x.split(-)
print(a)
"http://test.com/lalala"
print(b)
"134"
print(c)
"431"
and partition will divide the string with only first delimiter and will only return 3 values in list
x = 'http://test.com/lalala-134-431'
a,b,c = x.partition('-')
print(a)
"http://test.com/lalala"
print(b)
"-"
print(c)
"134-431"
so as you want last value you can use rpartition it works in same way but it will find delimiter from end of string
x = 'http://test.com/lalala-134-431'
a,b,c = x.partition('-')
print(a)
"http://test.com/lalala-134"
print(b)
"-"
print(c)
"431"
Find duplicates and delete all in notepad++
If it is possible to change the sequence of the lines you could do:
- sort line with Edit -> Line Operations -> Sort Lines Lexicographically ascending
- do a Find / Replace:
- Find What:
^(.*\r?\n)\1+
- Replace with: (Nothing, leave empty)
- Check Regular Expression in the lower left
- Click Replace All
How it works: The sorting puts the duplicates behind each other. The find matches a line ^(.*\r?\n)
and captures the line in \1
then it continues and tries to find \1
one or more times (+
) behind the first match. Such a block of duplicates (if it exists) is replaced with nothing.
The \r?\n
should deal nicely with Windows and Unix lineendings.
Insert json file into mongodb
Use
mongoimport --jsonArray --db test --collection docs --file example2.json
Its probably messing up because of the newline characters.
Import PEM into Java Key Store
I'm always forgetting how to do this because it's something that I just do once in a while, this is one possible solution, and it just works:
- Go to your favourite browser and download the main certificate from the secured website.
Execute the two following lines of code:
$ openssl x509 -outform der -in GlobalSignRootCA.crt -out GlobalSignRootCA.der
$ keytool -import -alias GlobalSignRootCA -keystore GlobalSignRootCA.jks -file GlobalSignRootCA.der
If executing in Java SE environment add the following options:
$ java -Djavax.net.ssl.trustStore=GlobalSignRootCA.jks -Djavax.net.ssl.trustStorePassword=trustStorePassword -jar MyJar.jar
Or add the following to the java code:
System.setProperty("javax.net.ssl.trustStore", "GlobalSignRootCA.jks");
System.setProperty("javax.net.ssl.trustStorePassword","trustStorePassword");
The other option for step 2 is to just using the keytool
command. Bellow is an example with a chain of certificates:
$ keytool -import -file org.eu.crt -alias orgcrt -keystore globalsignrs.jks
$ keytool -import -file GlobalSignOrganizationValidationCA-SHA256-G2.crt -alias globalsignorgvalca -keystore globalsignrs.jks
$ keytool -import -file GlobalSignRootCA.crt -alias globalsignrootca -keystore globalsignrs.jks
how do I create an array in jquery?
You may be confusing Javascript arrays with PHP arrays. In PHP, arrays are very flexible. They can either be numerically indexed or associative, or even mixed.
array('Item 1', 'Item 2', 'Items 3') // numerically indexed array
array('first' => 'Item 1', 'second' => 'Item 2') // associative array
array('first' => 'Item 1', 'Item 2', 'third' => 'Item 3')
Other languages consider these two to be different things, Javascript being among them. An array in Javascript is always numerically indexed:
['Item 1', 'Item 2', 'Item 3'] // array (numerically indexed)
An "associative array", also called Hash or Map, technically an Object in Javascript*, works like this:
{ first : 'Item 1', second : 'Item 2' } // object (a.k.a. "associative array")
They're not interchangeable. If you need "array keys", you need to use an object. If you don't, you make an array.
*
Technically everything is an Object in Javascript, please put that aside for this argument. ;)
How can I specify a branch/tag when adding a Git submodule?
To switch branch for a submodule (assuming you already have the submodule as part of the repository):
cd
to root of your repository containing the submodules
- Open
.gitmodules
for editing
- Add line below
path = ...
and url = ...
that says branch = your-branch
, for each submodule; save file .gitmodules
.
- then without changing directory do
$ git submodule update --remote
...this should pull in the latest commits on the specified branch, for each submodule thus modified.
Fill drop down list on selection of another drop down list
Model:
namespace MvcApplicationrazor.Models
{
public class CountryModel
{
public List<State> StateModel { get; set; }
public SelectList FilteredCity { get; set; }
}
public class State
{
public int Id { get; set; }
public string StateName { get; set; }
}
public class City
{
public int Id { get; set; }
public int StateId { get; set; }
public string CityName { get; set; }
}
}
Controller:
public ActionResult Index()
{
CountryModel objcountrymodel = new CountryModel();
objcountrymodel.StateModel = new List<State>();
objcountrymodel.StateModel = GetAllState();
return View(objcountrymodel);
}
//Action result for ajax call
[HttpPost]
public ActionResult GetCityByStateId(int stateid)
{
List<City> objcity = new List<City>();
objcity = GetAllCity().Where(m => m.StateId == stateid).ToList();
SelectList obgcity = new SelectList(objcity, "Id", "CityName", 0);
return Json(obgcity);
}
// Collection for state
public List<State> GetAllState()
{
List<State> objstate = new List<State>();
objstate.Add(new State { Id = 0, StateName = "Select State" });
objstate.Add(new State { Id = 1, StateName = "State 1" });
objstate.Add(new State { Id = 2, StateName = "State 2" });
objstate.Add(new State { Id = 3, StateName = "State 3" });
objstate.Add(new State { Id = 4, StateName = "State 4" });
return objstate;
}
//collection for city
public List<City> GetAllCity()
{
List<City> objcity = new List<City>();
objcity.Add(new City { Id = 1, StateId = 1, CityName = "City1-1" });
objcity.Add(new City { Id = 2, StateId = 2, CityName = "City2-1" });
objcity.Add(new City { Id = 3, StateId = 4, CityName = "City4-1" });
objcity.Add(new City { Id = 4, StateId = 1, CityName = "City1-2" });
objcity.Add(new City { Id = 5, StateId = 1, CityName = "City1-3" });
objcity.Add(new City { Id = 6, StateId = 4, CityName = "City4-2" });
return objcity;
}
View:
@model MvcApplicationrazor.Models.CountryModel
@{
ViewBag.Title = "Index";
Layout = "~/Views/Shared/_Layout.cshtml";
}
<script src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8/jquery-ui.min.js"></script>
<script language="javascript" type="text/javascript">
function GetCity(_stateId) {
var procemessage = "<option value='0'> Please wait...</option>";
$("#ddlcity").html(procemessage).show();
var url = "/Test/GetCityByStateId/";
$.ajax({
url: url,
data: { stateid: _stateId },
cache: false,
type: "POST",
success: function (data) {
var markup = "<option value='0'>Select City</option>";
for (var x = 0; x < data.length; x++) {
markup += "<option value=" + data[x].Value + ">" + data[x].Text + "</option>";
}
$("#ddlcity").html(markup).show();
},
error: function (reponse) {
alert("error : " + reponse);
}
});
}
</script>
<h4>
MVC Cascading Dropdown List Using Jquery</h4>
@using (Html.BeginForm())
{
@Html.DropDownListFor(m => m.StateModel, new SelectList(Model.StateModel, "Id", "StateName"), new { @id = "ddlstate", @style = "width:200px;", @onchange = "javascript:GetCity(this.value);" })
<br />
<br />
<select id="ddlcity" name="ddlcity" style="width: 200px">
</select>
<br /><br />
}
Does bootstrap have builtin padding and margin classes?
Bootstrap has many facility of classes to easily style elements if HTML. It includes a various of padding and margin classes for modification of the appearance of the element.
.m-0 { margin:0!important; }
.m-1 { margin:.25rem!important; }
.m-2 { margin:.5rem!important; }
.m-3 { margin:1rem!important; }
.m-4 { margin:1.5rem!important; }
.m-5 { margin:3rem!important; }
.mt-0 { margin-top:0!important; }
.mr-0 { margin-right:0!important; }
.mb-0 { margin-bottom:0!important; }
.ml-0 { margin-left:0!important; }
.mx-0 { margin-left:0!immortant;margin-right:0!immortant; }
.my-0 { margin-top:0!important;margin-bottom:0!important; }
.mt-1 { margin-top:.25rem!important; }
.mr-1 { margin-right:.25rem!important; }
.mb-1 { margin-bottom:.25rem!important; }
.ml-1 { margin-left:.25rem!important; }
.mx-1 { margin-left:.25rem!important;margin-right:.25rem!important; }
.my-1 { margin-top:.25rem!important;margin-bottom:.25rem!important; }
.mt-2 { margin-top:.5rem!important; }
.mr-2 { margin-right:.5rem!important; }
.mb-2 { margin-bottom:.5rem!important; }
.ml-2 { margin-left:.5rem!important; }
.mx-2 { margin-right:.5rem!important;margin-left:.5rem!important; }
.my-2 { margin-top:.5rem!important;margin-bottom:.5rem!important; }
.mt-3 { margin-top:1rem!important; }
.mr-3 { margin-right:1rem!important; }
.mb-3 { margin-bottom:1rem!important; }
.ml-3 { margin-left:1rem!important; }
.mx-3 { margin-right:1rem!important;margin-left:1rem!important; }
.my-3 { margin-bottom:1rem!important;margin-top:1rem!important; }
.mt-4 { margin-top:1.5rem!important; }
.mr-4 { margin-right:1.5rem!important; }
.mb-4 { margin-bottom:1.5rem!important; }
.ml-4 { margin-left:1.5rem!important; }
.mx-4 { margin-right:1.5rem!important;margin-left:1.5rem!important; }
.my-4 { margin-top:1.5rem!important;margin-bottom:1.5rem!important; }
.mt-5 { margin-top:3rem!important; }
.mr-5 { margin-right:3rem!important; }
.mb-5 { margin-bottom:3rem!important; }
.ml-5 { margin-left:3rem!important; }
.mx-5 { margin-right:3rem!important;margin-left:3rem!important; }
.my-5 { margin-top:3rem!important;margin-bottom:3rem!important; }
.mt-auto { margin-top:auto!important; }
.mr-auto { margin-right:auto!important; }
.mb-auto { margin-bottom:auto!important; }
.ml-auto { margin-left:auto!important; }
.mx-auto { margin-right:auto!important;margin-left:auto!important; }
.my-auto { margin-bottom:auto!important;margin-top:auto!important; }
.p-0 { padding:0!important; }
.p-1 { padding:.25rem!important; }
.p-2 { padding:.5rem!important; }
.p-3 { padding:1rem!important; }
.p-4 { padding:1.5rem!important; }
.p-5 { padding:3rem!important; }
.pt-0 { padding-top:0!important; }
.pr-0 { padding-right:0!important; }
.pb-0 { padding-bottom:0!important; }
.pl-0 { padding-left:0!important; }
.px-0 { padding-left:0!important;padding-right:0!important; }
.py-0 { padding-top:0!important;padding-bottom:0!important; }
.pt-1 { padding-top:.25rem!important; }
.pr-1 { padding-right:.25rem!important; }
.pb-1 { padding-bottom:.25rem!important; }
.pl-1 { padding-left:.25rem!important; }
.px-1 { padding-left:.25rem!important;padding-right:.25rem!important; }
.py-1 { padding-top:.25rem!important;padding-bottom:.25rem!important; }
.pt-2 { padding-top:.5rem!important; }
.pr-2 { padding-right:.5rem!important; }
.pb-2 { padding-bottom:.5rem!important; }
.pl-2 { padding-left:.5rem!important; }
.px-2 { padding-right:.5rem!important;padding-left:.5rem!important; }
.py-2 { padding-top:.5rem!important;padding-bottom:.5rem!important; }
.pt-3 { padding-top:1rem!important; }
.pr-3 { padding-right:1rem!important; }
.pb-3 { padding-bottom:1rem!important; }
.pl-3 { padding-left:1rem!important; }
.py-3 { padding-bottom:1rem!important;padding-top:1rem!important; }
.px-3 { padding-right:1rem!important;padding-left:1rem!important; }
.pt-4 { padding-top:1.5rem!important; }
.pr-4 { padding-right:1.5rem!important; }
.pb-4 { padding-bottom:1.5rem!important; }
.pl-4 { padding-left:1.5rem!important; }
.px-4 { padding-right:1.5rem!important;padding-left:1.5rem!important; }
.py-4 { padding-top:1.5rem!important;padding-bottom:1.5rem!important; }
.pt-5 { padding-top:3rem!important; }
.pr-5 { padding-right:3rem!important; }
.pb-5 { padding-bottom:3rem!important; }
.pl-5 { padding-left:3rem!important; }
.px-5 { padding-right:3rem!important;padding-left:3rem!important; }
.py-5 { padding-top:3rem!important;padding-bottom:3rem!important; }
https://jsfiddle.net/ssuryar/x47bca1u/
How do I set the timeout for a JAX-WS webservice client?
I know this is old and answered elsewhere but hopefully this closes this down. I'm not sure why you would want to download the WSDL dynamically but the system properties:
sun.net.client.defaultConnectTimeout (default: -1 (forever))
sun.net.client.defaultReadTimeout (default: -1 (forever))
should apply to all reads and connects using HttpURLConnection which JAX-WS uses. This should solve your problem if you are getting the WSDL from a remote location - but a file on your local disk is probably better!
Next, if you want to set timeouts for specific services, once you've created your proxy you need to cast it to a BindingProvider (which you know already), get the request context and set your properties. The online JAX-WS documentation is wrong, these are the correct property names (well, they work for me).
MyInterface myInterface = new MyInterfaceService().getMyInterfaceSOAP();
Map<String, Object> requestContext = ((BindingProvider)myInterface).getRequestContext();
requestContext.put(BindingProviderProperties.REQUEST_TIMEOUT, 3000); // Timeout in millis
requestContext.put(BindingProviderProperties.CONNECT_TIMEOUT, 1000); // Timeout in millis
myInterface.callMyRemoteMethodWith(myParameter);
Of course, this is a horrible way to do things, I would create a nice factory for producing these binding providers that can be injected with the timeouts you want.
How to hide code from cells in ipython notebook visualized with nbviewer?
jupyter nbconvert yourNotebook.ipynb --no-input --no-prompt
jupyter nbconvert yourNotebook.ipynb
This part of the code will take the latex file format of the jupyter notebook and converts it to a html
--no-input
This is like a parameter we are saying during conversion that dont add any inputs : here the input to a cell is the code.. so we hide it
--no-prompt
Here also we are saying, During conversion dont show any prompts form the code like errors or warnings in the final HTML file ) so that that html will have only the Text and the code output in the form of a report !!..
Hope it helps :)
Installing ADB on macOS
If you've already installed Android Studio --
Add the following lines to the end of ~/.bashrc
or ~/.zshrc
(if using Oh My ZSH):
export ANDROID_HOME=/Users/$USER/Library/Android/sdk
export PATH=${PATH}:$ANDROID_HOME/tools:$ANDROID_HOME/platform-tools
Restart Terminal and you're good to go.
Laravel Eloquent "WHERE NOT IN"
The dynamic way of implement whereNotIn:
$users = User::where('status',0)->get();
foreach ($users as $user) {
$data[] = $user->id;
}
$available = User::orderBy('name', 'DEC')->whereNotIn('id', $data)->get();
Load image from resources area of project in C#
JDS's answer worked best. C# example loading image:
- Include the image as Resource (Project tree->Resources, right click to add the desirable file ImageName.png)
- Embedded Resource (Project tree->Resources->ImageName.png, right click select properties)
- .png file format (.bmp .jpg should also be OK)
pictureBox1.Image = ProjectName.Properties.Resources.ImageName;
Note the followings:
- The resource image file is "ImageName.png", file extension should be omitted.
- ProjectName may perhaps be more adequately understood as "Assembly name", which is to be the respective text entry on the Project->Properties page.
The example code line is run successfully using VisualStudio 2015 Community.
Variables within app.config/web.config
You can use environment variables in your app.config
for that scenario you describe
<configuration>
<appSettings>
<add key="Dir1" value="%MyBaseDir%\Dir1"/>
</appSettings>
</configuration>
Then you can easily get the path with:
var pathFromConfig = ConfigurationManager.AppSettings["Dir1"];
var expandedPath = Environment.ExpandEnvironmentVariables(pathFromConfig);
How to use ScrollView in Android?
A ScrollView is a special type of FrameLayout in that it allows users to scroll through a list of views that occupy more space than the physical display.I just add some attributes .
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:fillViewport="true"
android:scrollbars = "vertical"
android:scrollbarStyle="insideInset"
>
<TableLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:stretchColumns="1"
>
<!-- Add here which you want -->
</TableLayout>
</ScrollView>
Is it possible to read the value of a annotation in java?
Yes, if your Column annotation has the runtime retention
@Retention(RetentionPolicy.RUNTIME)
@interface Column {
....
}
you can do something like this
for (Field f: MyClass.class.getFields()) {
Column column = f.getAnnotation(Column.class);
if (column != null)
System.out.println(column.columnName());
}
UPDATE : To get private fields use
Myclass.class.getDeclaredFields()
How to add google-services.json in Android?
Instead of putting in root folder as given in docs of firebase, just copy the google-json file in the projectname/app 's root folder and it works fine then .
Its just simple !
Run php function on button click
You can use isset()
.
<form method="post">
<input type="submit" name="test" id="test" value="RUN" />
</form>
<?php
function testfun()
{
echo "Your test function on button click is working";
}
if(isset($_POST('submit')))
{
testfun();
}
?>
Create a list with initial capacity in Python
Concerns about preallocation in Python arise if you're working with NumPy, which has more C-like arrays. In this instance, preallocation concerns are about the shape of the data and the default value.
Consider NumPy if you're doing numerical computation on massive lists and want performance.
grep for special characters in Unix
You could try removing any alphanumeric characters and space. And then use -n
will give you the line number. Try following:
grep -vn "^[a-zA-Z0-9 ]*$" application.log
How to convert milliseconds to seconds with precision
Surely you just need:
double seconds = milliseconds / 1000.0;
There's no need to manually do the two parts separately - you just need floating point arithmetic, which the use of 1000.0
(as a double
literal) forces. (I'm assuming your milliseconds
value is an integer of some form.)
Note that as usual with double
, you may not be able to represent the result exactly. Consider using BigDecimal
if you want to represent 100ms as 0.1 seconds exactly. (Given that it's a physical quantity, and the 100ms wouldn't be exact in the first place, a double
is probably appropriate, but...)
Fatal error: Cannot use object of type stdClass as array in
Controller (Example: User.php)
<?php
defined('BASEPATH') or exit('No direct script access allowed');
class Users extends CI_controller
{
// Table
protected $table = 'users';
function index()
{
$data['users'] = $this->model->ra_object($this->table);
$this->load->view('users_list', $data);
}
}
View (Example: users_list.php)
<table>
<thead>
<tr>
<th>Name</th>
<th>Surname</th>
</tr>
</thead>
<tbody>
<?php foreach($users as $user) : ?>
<tr>
<td><?php echo $user->name; ?></td>
<td><?php echo $user->surname; ?></th>
</tr>
<?php endforeach; ?>
</tbody>
</table>
<!-- // User table -->
Merge/flatten an array of arrays
To flatten an array of single element arrays, you don't need to import a library, a simple loop is both the simplest and most efficient solution :
for (var i = 0; i < a.length; i++) {
a[i] = a[i][0];
}
To downvoters: please read the question, don't downvote because it doesn't suit your very different problem. This solution is both the fastest and simplest for the asked question.
Convert a object into JSON in REST service by Spring MVC
The Json conversion should work out-of-the box. In order this to happen you need add some simple configurations:
First add a contentNegotiationManager into your spring config file. It is responsible for negotiating the response type:
<bean id="contentNegotiationManager"
class="org.springframework.web.accept.ContentNegotiationManagerFactoryBean">
<property name="favorPathExtension" value="false" />
<property name="favorParameter" value="true" />
<property name="ignoreAcceptHeader" value="true" />
<property name="useJaf" value="false" />
<property name="defaultContentType" value="application/json" />
<property name="mediaTypes">
<map>
<entry key="json" value="application/json" />
<entry key="xml" value="application/xml" />
</map>
</property>
</bean>
<mvc:annotation-driven
content-negotiation-manager="contentNegotiationManager" />
<context:annotation-config />
Then add Jackson2 jars (jackson-databind and jackson-core) in the service's class path. Jackson is responsible for the data serialization to JSON. Spring will detect these and initialize the MappingJackson2HttpMessageConverter automatically for you.
Having only this configured I have my automatic conversion to JSON working. The described config has an additional benefit of giving you the possibility to serialize to XML if you set accept:application/xml header.
How to create a Restful web service with input parameters?
You can try this... put parameters as :
http://localhost:8080/WebApplication11/webresources/generic/getText?arg1=hello
in your browser...
package newpackage;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.UriInfo;
import javax.ws.rs.PathParam;
import javax.ws.rs.Produces;
import javax.ws.rs.Consumes;
import javax.ws.rs.DefaultValue;
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.PUT;
import javax.ws.rs.QueryParam;
@Path("generic")
public class GenericResource {
@Context
private UriInfo context;
/**
* Creates a new instance of GenericResource
*/
public GenericResource() {
}
/**
* Retrieves representation of an instance of newpackage.GenericResource
* @return an instance of java.lang.String
*/
@GET
@Produces("text/plain")
@Consumes("text/plain")
@Path("getText/")
public String getText(@QueryParam("arg1")
@DefaultValue("") String arg1) {
return arg1 ; }
@PUT
@Consumes("text/plain")
public void putText(String content) {
}
}
Automatically deleting related rows in Laravel (Eloquent ORM)
Note: This answer was written for Laravel 3. Thus might or might not works well in more recent version of Laravel.
You can delete all related photos before actually deleting the user.
<?php
class User extends Eloquent
{
public function photos()
{
return $this->has_many('Photo');
}
public function delete()
{
// delete all related photos
$this->photos()->delete();
// as suggested by Dirk in comment,
// it's an uglier alternative, but faster
// Photo::where("user_id", $this->id)->delete()
// delete the user
return parent::delete();
}
}
Hope it helps.
Curl Command to Repeat URL Request
You could use URL sequence substitution with a dummy query string (if you want to use CURL and save a few keystrokes):
curl http://www.myurl.com/?[1-20]
If you have other query strings in your URL, assign the sequence to a throwaway variable:
curl http://www.myurl.com/?myVar=111&fakeVar=[1-20]
Check out the URL section on the man page: https://curl.haxx.se/docs/manpage.html
Error:Execution failed for task ':app:transformClassesWithDexForDebug'
Just correct Google play services dependencies:
You are including all play services in your project. Only add those you want.
For example , if you are using only maps and g+ signin, than change
compile 'com.google.android.gms:play-services:8.1.0'
to
compile 'com.google.android.gms:play-services-maps:8.1.0'
compile 'com.google.android.gms:play-services-plus:8.1.0'
From the doc :
In versions of Google Play services prior to 6.5, you had to compile
the entire package of APIs into your app. In some cases, doing so made
it more difficult to keep the number of methods in your app (including
framework APIs, library methods, and your own code) under the 65,536
limit.
From version 6.5, you can instead selectively compile Google Play
service APIs into your app. For example, to include only the Google
Fit and Android Wear APIs, replace the following line in your
build.gradle file:
compile 'com.google.android.gms:play-services:8.3.0'
with these lines:
compile 'com.google.android.gms:play-services-fitness:8.3.0'
compile 'com.google.android.gms:play-services-wearable:8.3.0'
Whole list can be found here.
Shall we always use [unowned self] inside closure in Swift
According to Apple-doc
Weak references are always of an optional type, and automatically
become nil when the instance they reference is deallocated.
If the captured reference will never become nil, it should always be captured as an unowned reference, rather than a weak reference
Example -
// if my response can nil use [weak self]
resource.request().onComplete { [weak self] response in
guard let strongSelf = self else {
return
}
let model = strongSelf.updateModel(response)
strongSelf.updateUI(model)
}
// Only use [unowned self] unowned if guarantees that response never nil
resource.request().onComplete { [unowned self] response in
let model = self.updateModel(response)
self.updateUI(model)
}
How do I get the current mouse screen coordinates in WPF?
Do you want coordinates relative to the screen or the application?
If it's within the application just use:
Mouse.GetPosition(Application.Current.MainWindow);
If not, I believe you can add a reference to System.Windows.Forms
and use:
System.Windows.Forms.Control.MousePosition;
Syntax for a for loop in ruby
If you don't need to access your array, (just a simple for loop) you can use upto or each :
Upto:
1.9.3p392 :030 > 2.upto(4) {|i| puts i}
2
3
4
=> 2
Each:
1.9.3p392 :031 > (2..4).each {|i| puts i}
2
3
4
=> 2..4
How do I to insert data into an SQL table using C# as well as implement an upload function?
You should use parameters in your query to prevent attacks, like if someone entered '); drop table ArticlesTBL;--'
as one of the values.
string query = "INSERT INTO ArticlesTBL (ArticleTitle, ArticleContent, ArticleType, ArticleImg, ArticleBrief, ArticleDateTime, ArticleAuthor, ArticlePublished, ArticleHomeDisplay, ArticleViews)";
query += " VALUES (@ArticleTitle, @ArticleContent, @ArticleType, @ArticleImg, @ArticleBrief, @ArticleDateTime, @ArticleAuthor, @ArticlePublished, @ArticleHomeDisplay, @ArticleViews)";
SqlCommand myCommand = new SqlCommand(query, myConnection);
myCommand.Parameters.AddWithValue("@ArticleTitle", ArticleTitleTextBox.Text);
myCommand.Parameters.AddWithValue("@ArticleContent", ArticleContentTextBox.Text);
// ... other parameters
myCommand.ExecuteNonQuery();
(xkcd)
text-align:center won't work with form <label> tag (?)
label
is an inline element so its width is equal to the width of the text it contains. The browser is actually displaying the label with text-align:center
but since the label is only as wide as the text you don't notice.
The best thing to do is to apply a specific width to the label
that is greater than the width of the content - this will give you the results you want.
Object array initialization without default constructor
Nope.
But lo! If you use std::vector<Car>
, like you should be (never ever use new[]
), then you can specify exactly how elements should be constructed*.
*Well sort of. You can specify the value of which to make copies of.
Like this:
#include <iostream>
#include <vector>
class Car
{
private:
Car(); // if you don't use it, you can just declare it to make it private
int _no;
public:
Car(int no) :
_no(no)
{
// use an initialization list to initialize members,
// not the constructor body to assign them
}
void printNo()
{
// use whitespace, itmakesthingseasiertoread
std::cout << _no << std::endl;
}
};
int main()
{
int userInput = 10;
// first method: userInput copies of Car(5)
std::vector<Car> mycars(userInput, Car(5));
// second method:
std::vector<Car> mycars; // empty
mycars.reserve(userInput); // optional: reserve the memory upfront
for (int i = 0; i < userInput; ++i)
mycars.push_back(Car(i)); // ith element is a copy of this
// return 0 is implicit on main's with no return statement,
// useful for snippets and short code samples
}
With the additional function:
void printCarNumbers(Car *cars, int length)
{
for(int i = 0; i < length; i++) // whitespace! :)
std::cout << cars[i].printNo();
}
int main()
{
// ...
printCarNumbers(&mycars[0], mycars.size());
}
Note printCarNumbers
really should be designed differently, to accept two iterators denoting a range.
How to clear textarea on click?
You may try this code,
<textarea name="textarea" cols="70" rows="2" class="searchBox" id="textarea" onfocus="if(this.value == 'Please describe why') this.value='';" onblur="if(this.value == '') this.value='Please describe why';">Please describe why</textarea>
Sqlite or MySql? How to decide?
My few cents to previous excellent replies.
the site www.sqlite.org works on a sqlite database. Here is the link when the author (Richard Hipp) replies to a similar question.
How can I start an interactive console for Perl?
Not only did Matt Trout write an article about a REPL, he actually wrote one - Devel::REPL
I've used it a bit and it works fairly well, and it's under active development.
BTW, I have no idea why someone modded down the person who mentioned using "perl -e" from the console. This isn't really a REPL, true, but it's fantastically useful, and I use it all the time.
Hexadecimal value 0x00 is a invalid character
In my case, it took some digging, but found it.
My Context
I'm looking at exception/error logs from the website using Elmah. Elmah returns the state of the server at the of time the exception, in the form of a large XML document. For our reporting engine I pretty-print the XML with XmlWriter.
During a website attack, I noticed that some xmls weren't parsing and was receiving this '.', hexadecimal value 0x00, is an invalid character.
exception.
NON-RESOLUTION: I converted the document to a byte[]
and sanitized it of 0x00, but it found none.
When I scanned the xml document, I found the following:
...
<form>
...
<item name="SomeField">
<value
string="C:\boot.ini�.htm" />
</item>
...
There was the nul byte encoded as an html entity �
!!!
RESOLUTION: To fix the encoding, I replaced the �
value before loading it into my XmlDocument
, because loading it will create the nul byte and it will be difficult to sanitize it from the object. Here's my entire process:
XmlDocument xml = new XmlDocument();
details.Xml = details.Xml.Replace("�", "[0x00]"); // in my case I want to see it, otherwise just replace with ""
xml.LoadXml(details.Xml);
string formattedXml = null;
// I have this in a helper function, but for this example I have put it in-line
StringBuilder sb = new StringBuilder();
XmlWriterSettings settings = new XmlWriterSettings {
OmitXmlDeclaration = true,
Indent = true,
IndentChars = "\t",
NewLineHandling = NewLineHandling.None,
};
using (XmlWriter writer = XmlWriter.Create(sb, settings)) {
xml.Save(writer);
formattedXml = sb.ToString();
}
LESSON LEARNED: sanitize for illegal bytes using the associated html entity, if your incoming data is html encoded on entry.
git revert back to certain commit
You can revert all your files under your working directory and index by typing following this command
git reset --hard <SHAsum of your commit>
You can also type
git reset --hard HEAD #your current head point
or
git reset --hard HEAD^ #your previous head point
Hope it helps
Setting property 'source' to 'org.eclipse.jst.jee.server:JSFTut' did not find a matching property
Update to the latest release
Since this commit, this is is fixed in the development version of Tomcat. And now in released versions 9.0.13, 8.5.35, and 7.0.92.
From the 9.0.13 changelog:
Ignore an attribute named source on Context elements provided by StandardContext. This is to suppress warnings generated by the Eclipse / Tomcat integration provided by Eclipse. Based on a patch by mdfst13. (markt)
There are similar entries in the 7.0.92 and 8.5.35 changelogs.
The effect of this change is to suppress a warning when a source
attribute is declared on a Context
element in either server.xml or a context.xml. Since those are the two places that Eclipse puts such an attribute, that fixes this particular issue.
TL;DR: update to the latest Tomcat version in its branch, e.g. 9.0.13 or newer.
Convert bytes to bits in python
Here how to do it using format()
print "bin_signedDate : ", ''.join(format(x, '08b') for x in bytevector)
It is important the 08b . That means it will be a maximum of 8 leading zeros be appended to complete a byte. If you don't specify this then the format will just have a variable bit length for each converted byte.
Xml Parsing in C#
First add an Enrty
and Category
class:
public class Entry { public string Id { get; set; } public string Title { get; set; } public string Updated { get; set; } public string Summary { get; set; } public string GPoint { get; set; } public string GElev { get; set; } public List<string> Categories { get; set; } } public class Category { public string Label { get; set; } public string Term { get; set; } }
Then use LINQ to XML
XDocument xDoc = XDocument.Load("path"); List<Entry> entries = (from x in xDoc.Descendants("entry") select new Entry() { Id = (string) x.Element("id"), Title = (string)x.Element("title"), Updated = (string)x.Element("updated"), Summary = (string)x.Element("summary"), GPoint = (string)x.Element("georss:point"), GElev = (string)x.Element("georss:elev"), Categories = (from c in x.Elements("category") select new Category { Label = (string)c.Attribute("label"), Term = (string)c.Attribute("term") }).ToList(); }).ToList();
How to automatically update an application without ClickOnce?
This is the code to update the file but not to install
This program is made through dos for copying files to the latest date and run your program automatically. may help you
open notepad and save file below with ext .bat
xcopy \\IP address\folder_share_name\*.* /s /y /d /q
start "label" /b "youraplicationname.exe"
How to read embedded resource text file
Some VS .NET project types don’t auto-generate a .NET (.resx) file. The following steps add a Resource file to your project:
- Right-click the project node and select Add/New Item, scroll to Resources File. In the Name box choose an appropriate name, for instance Resources and click the button Add.
- The resource file Resources.resx is added to the project and can be seen as a node in the solution explorer.
- Actually, two files are created, there is also an auto-generated C# class Resources.Designer.cs. Don’t edit it, it is maintained by VS. The file contains a class named
Resources
.
Now you can add a text file as a resource, for example an xml file:
- Double-click Resources.resx. Select Add Resource > Add Existing File and scroll to the file you want to be included. Leave the default value Internal for Access Modify.
- An icon represents the new resource item. If selected, the property pane shows its properties. For xml files, under the property Encoding select Unicode (UTF-8) – Codepage 65001 instead of the default local codepage. For other text files select the correct encoding of this file, for example codepage 1252.
- For text files like xml files, the class
Resources
has a property of type string
that is named after the included file. If the file name is e.g. RibbonManifest.xml, then the property should have the name RibbonManifest
. You find the exact name in the code file Resources.Designer.cs.
- Use the string property like any other string property, for example:
string xml = Resources.RibbonManifest
. The general form is ResourceFileName.IncludedTextFileName
. Don’t use ResourceManager.GetString
since the get-function of the string property has done that already.
How do I pass multiple parameters in Objective-C?
You need to delimit each parameter name with a ":" at the very least. Technically the name is optional, but it is recommended for readability. So you could write:
- (NSMutableArray*)getBusStops:(NSString*)busStop :(NSSTimeInterval*)timeInterval;
or what you suggested:
- (NSMutableArray*)getBusStops:(NSString*)busStop forTime:(NSSTimeInterval*)timeInterval;
How do I change the UUID of a virtual disk?
The following worked for me:
run VBoxManage internalcommands sethduuid "VDI/VMDK file" twice (the first time is just to conveniently generate an UUID, you could use any other UUID generation method instead)
open the .vbox file in a text editor
replace the UUID found in Machine uuid="{...}" with the UUID you got when you ran sethduuid the first time
replace the UUID found in HardDisk uuid="{...}" and in Image uuid="{}" (towards the end) with the UUID you got when you ran sethduuid the second time
iOS 6 apps - how to deal with iPhone 5 screen size?
You need to add a 640x1136 pixels PNG image ([email protected]
) as a 4 inch default splash image of your project, and it will use extra spaces (without efforts on simple table based applications, games will require more efforts).
I've created a small UIDevice category in order to deal with all screen resolutions. You can get it here, but the code is as follows:
File UIDevice+Resolutions.h:
enum {
UIDeviceResolution_Unknown = 0,
UIDeviceResolution_iPhoneStandard = 1, // iPhone 1,3,3GS Standard Display (320x480px)
UIDeviceResolution_iPhoneRetina4 = 2, // iPhone 4,4S Retina Display 3.5" (640x960px)
UIDeviceResolution_iPhoneRetina5 = 3, // iPhone 5 Retina Display 4" (640x1136px)
UIDeviceResolution_iPadStandard = 4, // iPad 1,2,mini Standard Display (1024x768px)
UIDeviceResolution_iPadRetina = 5 // iPad 3 Retina Display (2048x1536px)
}; typedef NSUInteger UIDeviceResolution;
@interface UIDevice (Resolutions)
- (UIDeviceResolution)resolution;
NSString *NSStringFromResolution(UIDeviceResolution resolution);
@end
File UIDevice+Resolutions.m:
#import "UIDevice+Resolutions.h"
@implementation UIDevice (Resolutions)
- (UIDeviceResolution)resolution
{
UIDeviceResolution resolution = UIDeviceResolution_Unknown;
UIScreen *mainScreen = [UIScreen mainScreen];
CGFloat scale = ([mainScreen respondsToSelector:@selector(scale)] ? mainScreen.scale : 1.0f);
CGFloat pixelHeight = (CGRectGetHeight(mainScreen.bounds) * scale);
if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone){
if (scale == 2.0f) {
if (pixelHeight == 960.0f)
resolution = UIDeviceResolution_iPhoneRetina4;
else if (pixelHeight == 1136.0f)
resolution = UIDeviceResolution_iPhoneRetina5;
} else if (scale == 1.0f && pixelHeight == 480.0f)
resolution = UIDeviceResolution_iPhoneStandard;
} else {
if (scale == 2.0f && pixelHeight == 2048.0f) {
resolution = UIDeviceResolution_iPadRetina;
} else if (scale == 1.0f && pixelHeight == 1024.0f) {
resolution = UIDeviceResolution_iPadStandard;
}
}
return resolution;
}
@end
This is how you need to use this code.
1) Add the above UIDevice+Resolutions.h & UIDevice+Resolutions.m files to your project
2) Add the line #import "UIDevice+Resolutions.h" to your ViewController.m
3) Add this code to check what versions of device you are dealing with
int valueDevice = [[UIDevice currentDevice] resolution];
NSLog(@"valueDevice: %d ...", valueDevice);
if (valueDevice == 0)
{
//unknow device - you got me!
}
else if (valueDevice == 1)
{
//standard iphone 3GS and lower
}
else if (valueDevice == 2)
{
//iphone 4 & 4S
}
else if (valueDevice == 3)
{
//iphone 5
}
else if (valueDevice == 4)
{
//ipad 2
}
else if (valueDevice == 5)
{
//ipad 3 - retina display
}
What is the difference between Tomcat, JBoss and Glassfish?
Tomcat is just a servlet container, i.e. it implements only the servlets and JSP specification. Glassfish and JBoss are full Java EE servers (including stuff like EJB, JMS, ...), with Glassfish being the reference implementation of the latest Java EE 6 stack, but JBoss in 2010 was not fully supporting it yet.
Simplest way to detect a pinch
My answer is inspired by Jeffrey's answer. Where that answer gives a more abstract solution, I try to provide more concrete steps on how to potentially implement it. This is simply a guide, one that can be implemented more elegantly. For a more detailed example check out this tutorial by MDN web docs.
HTML:
<div id="zoom_here">....</div>
JS
<script>
var dist1=0;
function start(ev) {
if (ev.targetTouches.length == 2) {//check if two fingers touched screen
dist1 = Math.hypot( //get rough estimate of distance between two fingers
ev.touches[0].pageX - ev.touches[1].pageX,
ev.touches[0].pageY - ev.touches[1].pageY);
}
}
function move(ev) {
if (ev.targetTouches.length == 2 && ev.changedTouches.length == 2) {
// Check if the two target touches are the same ones that started
var dist2 = Math.hypot(//get rough estimate of new distance between fingers
ev.touches[0].pageX - ev.touches[1].pageX,
ev.touches[0].pageY - ev.touches[1].pageY);
//alert(dist);
if(dist1>dist2) {//if fingers are closer now than when they first touched screen, they are pinching
alert('zoom out');
}
if(dist1<dist2) {//if fingers are further apart than when they first touched the screen, they are making the zoomin gesture
alert('zoom in');
}
}
}
document.getElementById ('zoom_here').addEventListener ('touchstart', start, false);
document.getElementById('zoom_here').addEventListener('touchmove', move, false);
</script>
how to overwrite css style
You can create one more class naming
.flex-control-thumbs-without-width li {
width: auto;
float: initial; or none
}
Add this class whenever you need to override like below,
<li class="flex-control-thumbs flex-control-thumbs-without-width"> </li>
And do remove whenever you don't need for other <li>
Forward host port to docker container
Your docker host exposes an adapter to all the containers. Assuming you are on recent ubuntu, you can run
ip addr
This will give you a list of network adapters, one of which will look something like
3: docker0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP
link/ether 22:23:6b:28:6b:e0 brd ff:ff:ff:ff:ff:ff
inet 172.17.42.1/16 scope global docker0
inet6 fe80::a402:65ff:fe86:bba6/64 scope link
valid_lft forever preferred_lft forever
You will need to tell rabbit/mongo to bind to that IP (172.17.42.1). After that, you should be able to open connections to 172.17.42.1 from within your containers.
Meaning of Open hashing and Closed hashing
The use of "closed" vs. "open" reflects whether or not we are locked in to using a certain position or data structure (this is an extremely vague description, but hopefully the rest helps).
For instance, the "open" in "open addressing" tells us the index (aka. address) at which an object will be stored in the hash table is not completely determined by its hash code. Instead, the index may vary depending on what's already in the hash table.
The "closed" in "closed hashing" refers to the fact that we never leave the hash table; every object is stored directly at an index in the hash table's internal array. Note that this is only possible by using some sort of open addressing strategy. This explains why "closed hashing" and "open addressing" are synonyms.
Contrast this with open hashing - in this strategy, none of the objects are actually stored in the hash table's array; instead once an object is hashed, it is stored in a list which is separate from the hash table's internal array. "open" refers to the freedom we get by leaving the hash table, and using a separate list. By the way, "separate list" hints at why open hashing is also known as "separate chaining".
In short, "closed" always refers to some sort of strict guarantee, like when we guarantee that objects are always stored directly within the hash table (closed hashing). Then, the opposite of "closed" is "open", so if you don't have such guarantees, the strategy is considered "open".
How can I tell Moq to return a Task?
Your method doesn't have any callbacks so there is no reason to use .CallBack()
. You can simply return a Task with the desired values using .Returns()
and Task.FromResult, e.g.:
MyType someValue=...;
mock.Setup(arg=>arg.DoSomethingAsync())
.Returns(Task.FromResult(someValue));
Update 2014-06-22
Moq 4.2 has two new extension methods to assist with this.
mock.Setup(arg=>arg.DoSomethingAsync())
.ReturnsAsync(someValue);
mock.Setup(arg=>arg.DoSomethingAsync())
.ThrowsAsync(new InvalidOperationException());
Update 2016-05-05
As Seth Flowers mentions in the other answer, ReturnsAsync
is only available for methods that return a Task<T>
. For methods that return only a Task,
.Returns(Task.FromResult(default(object)))
can be used.
As shown in this answer, in .NET 4.6 this is simplified to .Returns(Task.CompletedTask);
, e.g.:
mock.Setup(arg=>arg.DoSomethingAsync())
.Returns(Task.CompletedTask);
The preferred way of creating a new element with jQuery
If #box
is empty, nothing, but if it's not these do very different things. The former will add a div
as the last child node of #box
. The latter completely replaces the contents of #box
with a single empty div
, text and all.
jQuery's .on() method combined with the submit event
You need to delegate event to the document level
$(document).on('submit','form.remember',function(){
// code
});
$('form.remember').on('submit'
work same as $('form.remember').submit(
but when you use $(document).on('submit','form.remember'
then it will also work for the DOM added later.
DIV height set as percentage of screen?
By using absolute positioning, you can make <body>
or <form>
or <div>
, fit to your browser page. For example:
<body style="position: absolute; bottom: 0px; top: 0px; left: 0px; right: 0px;">
and then simply put a <div>
inside it and use whatever percentage of either height
or width
you wish
<div id="divContainer" style="height: 100%;">
What does it mean by select 1 from table?
This means that You want a value "1" as output or Most of the time used as Inner Queries because for some reason you want to calculate the outer queries based on the result of inner queries.. not all the time you use 1 but you have some specific values...
This will statically gives you output as value 1.
How do I put two increment statements in a C++ 'for' loop?
I came here to remind myself how to code a second index into the increment clause of a FOR loop, which I knew could be done mainly from observing it in a sample that I incorporated into another project, that written in C++.
Today, I am working in C#, but I felt sure that it would obey the same rules in this regard, since the FOR statement is one of the oldest control structures in all of programming. Thankfully, I had recently spent several days precisely documenting the behavior of a FOR loop in one of my older C programs, and I quickly realized that those studies held lessons that applied to today's C# problem, in particular to the behavior of the second index variable.
For the unwary, following is a summary of my observations. Everything I saw happening today, by carefully observing variables in the Locals window, confirmed my expectation that a C# FOR statement behaves exactly like a C or C++ FOR statement.
- The first time a FOR loop executes, the increment clause (the 3rd of its three) is skipped. In Visual C and C++, the increment is generated as three machine instructions in the middle of the block that implements the loop, so that the initial pass runs the initialization code once only, then jumps over the increment block to execute the termination test. This implements the feature that a FOR loop executes zero or more times, depending on the state of its index and limit variables.
- If the body of the loop executes, its last statement is a jump to the first of the three increment instructions that were skipped by the first iteration. After these execute, control falls naturally into the limit test code that implements the middle clause. The outcome of that test determines whether the body of the FOR loop executes, or whether control transfers to the next instruction past the jump at the bottom of its scope.
- Since control transfers from the bottom of the FOR loop block to the increment block, the index variable is incremented before the test is executed. Not only does this behavior explain why you must code your limit clauses the way you learned, but it affects any secondary increment that you add, via the comma operator, because it becomes part of the third clause. Hence, it is not changed on the first iteration, but it is on the last iteration, which never executes the body.
If either of your index variables remains in scope when the loop ends, their value will be one higher than the threshold that stops the loop, in the case of the true index variable. Likewise, if, for example, the second variable is initialized to zero before the loop is entered, its value at the end will be the iteration count, assuming that it is an increment (++), not a decrement, and that nothing in the body of the loop changes its value.
Having services in React application
I am in the same boot like you. In the case you mention, I would implement the input validation UI component as a React component.
I agree the implementation of the validation logic itself should (must) not be coupled. Therefore I would put it into a separate JS module.
That is, for logic that should not be coupled use a JS module/class in separate file, and use require/import to de-couple the component from the "service".
This allows for dependency injection and unit testing of the two independently.
HTML form submit to PHP script
Try this:
<form method="post" action="check.php">
<select name="website_string">
<option value="" selected="selected"></option>
<option VALUE="abc"> ABC</option>
<option VALUE="def"> def</option>
<option VALUE="hij"> hij</option>
</select>
<input TYPE="submit" name="submit" />
</form>
Both your select control and your submit button had the same name
attribute, so the last one used was the submit button when you clicked it. All other syntax errors aside.
check.php
<?php
echo $_POST['website_string'];
?>
Obligatory disclaimer about using raw $_POST
data. Sanitize anything you'll actually be using in application logic.
Why do I get PLS-00302: component must be declared when it exists?
You can get that error if you have an object with the same name as the schema. For example:
create sequence s2;
begin
s2.a;
end;
/
ORA-06550: line 2, column 6:
PLS-00302: component 'A' must be declared
ORA-06550: line 2, column 3:
PL/SQL: Statement ignored
When you refer to S2.MY_FUNC2
the object name is being resolved so it doesn't try to evaluate S2 as a schema name. When you just call it as MY_FUNC2
there is no confusion, so it works.
The documentation explains name resolution. The first piece of the qualified object name - S2 here - is evaluated as an object on the current schema before it is evaluated as a different schema.
It might not be a sequence; other objects can cause the same error. You can check for the existence of objects with the same name by querying the data dictionary.
select owner, object_type, object_name
from all_objects
where object_name = 'S2';
How to make a shape with left-top round rounded corner and left-bottom rounded corner?
This bug is filed here.
This is a bug of android devices having API level less than 12.
You've to put correct versions of your layouts in drawable-v12 folder which will be used for API level 12 or higher.
And an erroneous version(corners switched/reversed) of the same layout will be put in the default drawable folder which will be used by the devices having API level less than 12.
For example: I had to design a button with rounded corner at bottom-right.
In 'drawable' folder - button.xml: I had to make bottom-left corner rounded.
<shape>
<corners android:bottomLeftRadius="15dp"/>
</shape>
In 'drawable-v12' folder - button.xml: Correct version of the layout was placed here to be used for API level 12 or higher.
<shape>
<corners android:bottomLeftRadius="15dp"/>
</shape>
How to determine the version of android SDK installed in computer?
Create a Batch file (.bat) in Windows with the following command in it:
%ANDROID_HOME%\tools\bin\sdkmanager.bat --list && pause
NOTE: Using && pause
is necessary to be able to review the information, once it is listed. If not used, the batch file will simply run, show the information in just mere few seconds and exit right away.
How to pass parameter to click event in Jquery
Better Approach:
<script type="text/javascript">
$('#btn').click(function() {
var id = $(this).attr('id');
alert(id);
});
</script>
<input id="btn" type="button" value="click" />
But, if you REALLY need to do the click handler inline, this will work:
<script type="text/javascript">
function display(el) {
var id = $(el).attr('id');
alert(id);
}
</script>
<input id="btn" type="button" value="click" OnClick="display(this);" />
Inserting values into tables Oracle SQL
You can expend the following function in order to pull out more parameters from the DB before the insert:
--
-- insert_employee (Function)
--
CREATE OR REPLACE FUNCTION insert_employee(p_emp_id in number, p_emp_name in varchar2, p_emp_address in varchar2, p_emp_state in varchar2, p_emp_position in varchar2, p_emp_manager in varchar2)
RETURN VARCHAR2 AS
p_state_id varchar2(30) := '';
BEGIN
select state_id
into p_state_id
from states where lower(emp_state) = state_name;
INSERT INTO Employee (emp_id, emp_name, emp_address, emp_state, emp_position, emp_manager) VALUES
(p_emp_id, p_emp_name, p_emp_address, p_state_id, p_emp_position, p_emp_manager);
return 'SUCCESS';
EXCEPTION
WHEN others THEN
RETURN 'FAIL';
END;
/
Restore LogCat window within Android Studio
In Android Studio 2.3.2 you will have to click on "Android Monitor" panel at the bottom and "logcat" is a tab of this pannel. See attachment.
If you do not have this panel you will have to go to Your main menu and then View->ToolBar/ToolButtons/Statusbar/Navigationbar
This app won't run unless you update Google Play Services (via Bazaar)
I've been trying to run an Android Google Maps v2 under an emulator, and I found many ways to do that, but none of them worked for me. I have always this warning in the Logcat Google Play services out of date. Requires 3025100 but found 2010110
and when I want to update Google Play services on the emulator nothing happened. The problem was that the com.google.android.gms APK was not compatible with the version of the library in my Android SDK.
I installed these files "com.google.android.gms.apk", "com.android.vending.apk" on my emulator and my app Google Maps v2 worked fine. None of the other steps regarding /system/app were required.
How do I set proxy for chrome in python webdriver?
from selenium import webdriver
from selenium.webdriver.common.proxy import *
myProxy = "86.111.144.194:3128"
proxy = Proxy({
'proxyType': ProxyType.MANUAL,
'httpProxy': myProxy,
'ftpProxy': myProxy,
'sslProxy': myProxy,
'noProxy':''})
driver = webdriver.Firefox(proxy=proxy)
driver.set_page_load_timeout(30)
driver.get('http://whatismyip.com')
Rails params explained?
Params contains the following three groups of parameters:
- User supplied parameters
- GET (http://domain.com/url?param1=value1¶m2=value2 will set params[:param1] and params[:param2])
- POST (e.g. JSON, XML will automatically be parsed and stored in params)
- Note: By default, Rails duplicates the user supplied parameters and stores them in params[:user] if in UsersController, can be changed with wrap_parameters setting
- Routing parameters
match '/user/:id'
in routes.rb will set params[:id]
- Default parameters
params[:controller]
and params[:action]
is always available and contains the current controller and action
Using $setValidity inside a Controller
$setValidity needs to be called on the ngModelController. Inside the controller, I think that means $scope.myForm.file.$setValidity()
.
See also section "Custom Validation" on the Forms page, if you haven't already.
Also, for the first argument to $setValidity, use just 'filetype' and 'size'.
How to delete directory content in Java?
All files must be delete from the directory before it is deleted.
There are third party libraries that have a lot of common utilities, including ones that does that for you:
Python: Ignore 'Incorrect padding' error when base64 decoding
Simply add additional characters like "=" or any other and make it a multiple of 4 before you try decoding the target string value. Something like;
if len(value) % 4 != 0: #check if multiple of 4
while len(value) % 4 != 0:
value = value + "="
req_str = base64.b64decode(value)
else:
req_str = base64.b64decode(value)
SQL Server: SELECT only the rows with MAX(DATE)
If rownumber() over(...)
is available for you ....
select OrderNO,
PartCode,
Quantity
from (select OrderNO,
PartCode,
Quantity,
row_number() over(partition by OrderNO order by DateEntered desc) as rn
from YourTable) as T
where rn = 1
Mysql where id is in array
Change
$array=array_map('intval', explode(',', $string));
To:
$array= implode(',', array_map('intval', explode(',', $string)));
array_map returns an array, not a string. You need to convert the array to a comma separated string in order to use in the WHERE clause.
implement time delay in c
you can simply call delay() function. So if you want to delay the process in 3 seconds, call delay(3000)...
disable textbox using jquery?
HTML
<span id="radiobutt">
<input type="radio" name="rad1" value="1" />
<input type="radio" name="rad1" value="2" />
<input type="radio" name="rad1" value="3" />
</span>
<div>
<input type="text" id="textbox1" />
<input type="checkbox" id="checkbox1" />
</div>
Javascript
$("#radiobutt input[type=radio]").each(function(i){
$(this).click(function () {
if(i==2) { //3rd radiobutton
$("#textbox1").attr("disabled", "disabled");
$("#checkbox1").attr("disabled", "disabled");
}
else {
$("#textbox1").removeAttr("disabled");
$("#checkbox1").removeAttr("disabled");
}
});
});
Throwing multiple exceptions in a method of an interface in java
You can declare as many Exceptions as you want for your interface method. But the class you gave in your question is invalid. It should read
public class MyClass implements MyInterface {
public void find(int x) throws A_Exception, B_Exception{
----
----
---
}
}
Then an interface would look like this
public interface MyInterface {
void find(int x) throws A_Exception, B_Exception;
}
Multiple actions were found that match the request in Web Api
In my Case Everything was right
1) Web Config was configured properly
2) Route prefix and Route attributes were proper
Still i was getting the error. In my Case "Route" attribute (by pressing F12) was point to System.Web.MVc but not System.Web.Http which caused the issue.
Failed to load resource: the server responded with a status of 500 (Internal Server Error) in Bind function
The 500 code would normally indicate an error on the server, not anything with your code. Some thoughts
- Talk to the server developer for more info. You can't get more info directly.
- Verify your arguments into the call (values). Look for anything you might think could cause a problem for the server process. The process should not die and should return you a better code, but bugs happen there also.
- Could be intermittent, like if the server database goes down. May be worth trying at another time.
Java 8 Filter Array Using Lambda
even simpler, adding up to String[]
,
use built-in filter filter(StringUtils::isNotEmpty)
of org.apache.commons.lang3
import org.apache.commons.lang3.StringUtils;
String test = "a\nb\n\nc\n";
String[] lines = test.split("\\n", -1);
String[] result = Arrays.stream(lines).filter(StringUtils::isNotEmpty).toArray(String[]::new);
System.out.println(Arrays.toString(lines));
System.out.println(Arrays.toString(result));
and output:
[a, b, , c, ]
[a, b, c]
How can I disable the UITableView selection?
Swift Solution w/ Custom Cell:
import Foundation
class CustomTableViewCell: UITableViewCell
{
required init(coder aDecoder: NSCoder)
{
fatalError("init(coder:) has not been implemented")
}
override init(style: UITableViewCellStyle, reuseIdentifier: String?)
{
super.init(style: style, reuseIdentifier: reuseIdentifier)
self.selectionStyle = UITableViewCellSelectionStyle.None
}
}
phpMyAdmin + CentOS 6.0 - Forbidden
Edit your httpd.conf file as follows:
# nano /etc/httpd/conf/httpd.conf
Add the following lines here:
<Directory "/usr/share/phpmyadmin">
Order allow,deny
Allow from all
</Directory>
Issue the following command:
# service httpd restart
If your problem is not solved then disable your SELinux.
How to insert Records in Database using C# language?
You should form the command with the contents of the textboxes:
sql = "insert into Main (Firt Name, Last Name) values(" + textbox2.Text + "," + textbox3.Text+ ")";
This, of course, provided that you manage to open the connection correctly.
It would be helpful to know what's happening with your current code. If you are getting some error displayed in that message box, it would be great to know what it's saying.
You should also validate the inputs before actually running the command (i.e. make sure they don't contain malicious code...).
Error: Selection does not contain a main type
Put your Main Java class file in src/main/java
folder and check if there is not any error in 'Java Build Path' by following right click on project and select Java Build Path->Source
.
How to open the terminal in Atom?
First, you should install "platformio-ide-terminal": Open "Preferences ?," >> Click "+ Install" >> In "Search packages" type "platformio-ide-terminal" >> Click "Install".
And answering exactly the question. If you have previously installed, just use:
- Shortcut:
ctrl-`
or Option+Command+T (??T)
- by Menu: Go to Packages > platformio-ide-terminal [or other] > New terminal
PHP combine two associative arrays into one array
I use a wrapper around array_merge to deal with SeanWM's comment about null arrays; I also sometimes want to get rid of duplicates. I'm also generally wanting to merge one array into another, as opposed to creating a new array. This ends up as:
/**
* Merge two arrays - but if one is blank or not an array, return the other.
* @param $a array First array, into which the second array will be merged
* @param $b array Second array, with the data to be merged
* @param $unique boolean If true, remove duplicate values before returning
*/
function arrayMerge(&$a, $b, $unique = false) {
if (empty($b)) {
return; // No changes to be made to $a
}
if (empty($a)) {
$a = $b;
return;
}
$a = array_merge($a, $b);
if ($unique) {
$a = array_unique($a);
}
}
How to print VARCHAR(MAX) using Print Statement?
I was looking to use the print statement to debug some dynamic sql as I imagin most of you are using print for simliar reasons.
I tried a few of the solutions listed and found that Kelsey's solution works with minor tweeks (@sql is my @script) n.b. LENGTH isn't a valid function:
--http://stackoverflow.com/questions/7850477/how-to-print-varcharmax-using-print-statement
--Kelsey
DECLARE @Counter INT
SET @Counter = 0
DECLARE @TotalPrints INT
SET @TotalPrints = (LEN(@sql) / 4000) + 1
WHILE @Counter < @TotalPrints
BEGIN
PRINT SUBSTRING(@sql, @Counter * 4000, 4000)
SET @Counter = @Counter + 1
END
PRINT LEN(@sql)
This code does as commented add a new line into the output, but for debugging this isn't a problem for me.
Ben B's solution is perfect and is the most elegent, although for debugging is a lot of lines of code so I choose to use my slight modification of Kelsey's. It might be worth creating a system like stored procedure in msdb for Ben B's code which could be reused and called in one line?
Alfoks' code doesn't work unfortunately because that would have been easier.
How to Automatically Close Alerts using Twitter Bootstrap
Calling window.setTimeout(function, delay)
will allow you to accomplish this. Here's an example that will automatically close the alert 2 seconds (or 2000 milliseconds) after it is displayed.
$(".alert-message").alert();
window.setTimeout(function() { $(".alert-message").alert('close'); }, 2000);
If you want to wrap it in a nifty function you could do this.
function createAutoClosingAlert(selector, delay) {
var alert = $(selector).alert();
window.setTimeout(function() { alert.alert('close') }, delay);
}
Then you could use it like so...
createAutoClosingAlert(".alert-message", 2000);
I am certain there are more elegant ways to accomplish this.
"CASE" statement within "WHERE" clause in SQL Server 2008
select TUM1.userid,TUM1.first_name + ' ' +TUM1.last_name as NAME,tum1.Business_Title,TUM1.manager_id,tum2.First_Name + ' ' + tum2.Last_Name as [MANAGER NAME],TUM1.project,TUM1.project_code,TUM1.rcc_code,TUM1.department,TCM.Company_Name,
case
when tum1.Gender_ID=1 then 'male'
else 'female'
end 'GENDER'
,tum1.Band as BAND,
case when tum1.Inactive=0 then 'STILL IN COMPANY'
else 'LEFT COMPANY'
end 'ACTIVE/INACTIVE'
from tbl_user_master TUM1
join tbl_Company_Master TCM on TCM.Company_Code=TUM1.Company_Code
join tbl_User_Master TUM2 on TUM1.Manager_ID=TUM2.UserID
where tum1.UserID in ('54545414')
Creating table variable in SQL server 2008 R2
@tableName
Table variables are alive for duration of the script running only i.e. they are only session level objects.
To test this, open two query editor windows under sql server management studio, and create table variables with same name but different structures. You will get an idea. The @tableName
object is thus temporary and used for our internal processing of data, and it doesn't contribute to the actual database structure.
There is another type of table object which can be created for temporary use. They are #tableName
objects declared like similar create statement for physical tables:
Create table #test (Id int, Name varchar(50))
This table object is created and stored in temp database. Unlike the first one, this object is more useful, can store large data and takes part in transactions etc. These tables are alive till the connection is open. You have to drop the created object by following script before re-creating it.
IF OBJECT_ID('tempdb..#test') IS NOT NULL
DROP TABLE #test
Hope this makes sense !
What resources are shared between threads?
Something that really needs to be pointed out is that there are really two aspects to this question - the theoretical aspect and the implementations aspect.
First, let's look at the theoretical aspect. You need to understand what a process is conceptually to understand the difference between a process and a thread and what's shared between them.
We have the following from section 2.2.2 The Classical Thread Model in Modern Operating Systems 3e by Tanenbaum:
The process model is based on two independent concepts: resource
grouping and execution. Sometimes it is useful to separate them;
this is where threads come in....
He continues:
One way of looking at a process is that it is a way to
group related resources together. A process has an address space
containing program text and data, as well as other resources. These
resource may include open files, child processes, pending alarms,
signal handlers, accounting information, and more. By putting them
together in the form of a process, they can be managed more easily.
The other concept a process has is a thread of execution, usually
shortened to just thread. The thread has a program counter that keeps
track of which instruction to execute next. It has registers, which
hold its current working variables. It has a stack, which contains the
execution history, with one frame for each procedure called but not
yet returned from. Although a thread must execute in some process, the
thread and its process are different concepts and can be treated
separately. Processes are used to group resources together; threads
are the entities scheduled for execution on the CPU.
Further down he provides the following table:
Per process items | Per thread items
------------------------------|-----------------
Address space | Program counter
Global variables | Registers
Open files | Stack
Child processes | State
Pending alarms |
Signals and signal handlers |
Accounting information |
The above is what you need for threads to work. As others have pointed out, things like segments are OS dependant implementation details.
SQL JOIN and different types of JOINs
I'm going to push my pet peeve: the USING keyword.
If both tables on both sides of the JOIN have their foreign keys properly named (ie, same name, not just "id) then this can be used:
SELECT ...
FROM customers JOIN orders USING (customer_id)
I find this very practical, readable, and not used often enough.
When to use React setState callback
Yes there is, since setState
works in an asynchronous
way. That means after calling setState
the this.state
variable is not immediately changed. so if you want to perform an action immediately after setting state on a state variable and then return a result, a callback will be useful
Consider the example below
....
changeTitle: function changeTitle (event) {
this.setState({ title: event.target.value });
this.validateTitle();
},
validateTitle: function validateTitle () {
if (this.state.title.length === 0) {
this.setState({ titleError: "Title can't be blank" });
}
},
....
The above code may not work as expected since the title
variable may not have mutated before validation is performed on it. Now you may wonder that we can perform the validation in the render()
function itself but it would be better and a cleaner way if we can handle this in the changeTitle function itself since that would make your code more organised and understandable
In this case callback is useful
....
changeTitle: function changeTitle (event) {
this.setState({ title: event.target.value }, function() {
this.validateTitle();
});
},
validateTitle: function validateTitle () {
if (this.state.title.length === 0) {
this.setState({ titleError: "Title can't be blank" });
}
},
....
Another example will be when you want to dispatch
and action when the state changed. you will want to do it in a callback and not the render()
as it will be called everytime rerendering occurs and hence many such scenarios are possible where you will need callback.
Another case is a API Call
A case may arise when you need to make an API call based on a particular state change, if you do that in the render method, it will be called on every render onState
change or because some Prop passed down to the Child Component
changed.
In this case you would want to use a setState callback
to pass the updated state value to the API call
....
changeTitle: function (event) {
this.setState({ title: event.target.value }, () => this.APICallFunction());
},
APICallFunction: function () {
// Call API with the updated value
}
....
gcc/g++: "No such file or directory"
Your compiler just tried to compile the file named foo.cc
. Upon hitting line number line
, the compiler finds:
#include "bar"
or
#include <bar>
The compiler then tries to find that file. For this, it uses a set of directories to look into, but within this set, there is no file bar
. For an explanation of the difference between the versions of the include statement look here.
How to tell the compiler where to find it
g++
has an option -I
. It lets you add include search paths to the command line. Imagine that your file bar
is in a folder named frobnicate
, relative to foo.cc
(assume you are compiling from the directory where foo.cc
is located):
g++ -Ifrobnicate foo.cc
You can add more include-paths; each you give is relative to the current directory. Microsoft's compiler has a correlating option /I
that works in the same way, or in Visual Studio, the folders can be set in the Property Pages of the Project, under Configuration Properties->C/C++->General->Additional Include Directories.
Now imagine you have multiple version of bar
in different folders, given:
// A/bar
#include<string>
std::string which() { return "A/bar"; }
// B/bar
#include<string>
std::string which() { return "B/bar"; }
// C/bar
#include<string>
std::string which() { return "C/bar"; }
// foo.cc
#include "bar"
#include <iostream>
int main () {
std::cout << which() << std::endl;
}
The priority with #include "bar"
is leftmost:
$ g++ -IA -IB -IC foo.cc
$ ./a.out
A/bar
As you see, when the compiler started looking through A/
, B/
and C/
, it stopped at the first or leftmost hit.
This is true of both forms, include <>
and incude ""
.
Difference between #include <bar>
and #include "bar"
Usually, the #include <xxx>
makes it look into system folders first, the #include "xxx"
makes it look into the current or custom folders first.
E.g.:
Imagine you have the following files in your project folder:
list
main.cc
with main.cc
:
#include "list"
....
For this, your compiler will #include
the file list
in your project folder, because it currently compiles main.cc
and there is that file list
in the current folder.
But with main.cc
:
#include <list>
....
and then g++ main.cc
, your compiler will look into the system folders first, and because <list>
is a standard header, it will #include
the file named list
that comes with your C++ platform as part of the standard library.
This is all a bit simplified, but should give you the basic idea.
Details on <>
/""
-priorities and -I
According to the gcc-documentation, the priority for include <>
is, on a "normal Unix system", as follows:
/usr/local/include
libdir/gcc/target/version/include
/usr/target/include
/usr/include
For C++ programs, it will also look in /usr/include/c++/version, first. In the above, target is the canonical name of the system GCC was configured to compile code for; [...].
The documentation also states:
You can add to this list with the -Idir command line option. All the directories named by -I are searched, in left-to-right order, before the default directories. The only exception is when dir is already searched by default. In this case, the option is ignored and the search order for system directories remains unchanged.
To continue our #include<list> / #include"list"
example (same code):
g++ -I. main.cc
and
#include<list>
int main () { std::list<int> l; }
and indeed, the -I.
prioritizes the folder .
over the system includes and we get a compiler error.
How can I merge two commits into one if I already started rebase?
If you want to combine the two most recent commits and just use the older commit's message, you can automate the process using expect
.
I assume:
- You're using vi as your editor
- Your commits are one-line each
I tested with git version 2.14.3 (Apple Git-98)
.
#!/usr/bin/env expect
spawn git rebase -i HEAD~2
# change the second "pick" to "squash"
# down, delete word, insert 's' (for squash), Escape, save and quit
send "jdwis \033:wq\r"
expect "# This is a"
# skip past first commit message (assumed to be one line), delete rest of file
# down 4, delete remaining lines, save and quit
send "4jdG\r:wq\r"
interact
How to get relative path from absolute path
I'm using this:
public static class StringExtensions
{
/// <summary>
/// Creates a relative path from one file or folder to another.
/// </summary>
/// <param name="absPath">Absolute path.</param>
/// <param name="relTo">Directory that defines the start of the relative path.</param>
/// <returns>The relative path from the start directory to the end path.</returns>
public static string MakeRelativePath(this string absPath, string relTo)
{
string[] absParts = absPath.Split(Path.DirectorySeparatorChar);
string[] relParts = relTo.Split(Path.DirectorySeparatorChar);
// Get the shortest of the two paths
int len = absParts.Length < relParts.Length
? absParts.Length : relParts.Length;
// Use to determine where in the loop we exited
int lastCommonRoot = -1;
int index;
// Find common root
for (index = 0; index < len; index++)
{
if (absParts[index].Equals(relParts[index], StringComparison.OrdinalIgnoreCase))
lastCommonRoot = index;
else
break;
}
// If we didn't find a common prefix then throw
if (lastCommonRoot == -1)
throw new ArgumentException("The path of the two files doesn't have any common base.");
// Build up the relative path
var relativePath = new StringBuilder();
// Add on the ..
for (index = lastCommonRoot + 1; index < relParts.Length; index++)
{
relativePath.Append("..");
relativePath.Append(Path.DirectorySeparatorChar);
}
// Add on the folders
for (index = lastCommonRoot + 1; index < absParts.Length - 1; index++)
{
relativePath.Append(absParts[index]);
relativePath.Append(Path.DirectorySeparatorChar);
}
relativePath.Append(absParts[absParts.Length - 1]);
return relativePath.ToString();
}
}
How to check if a character is upper-case in Python?
You can use this regex:
^[A-Z][a-z]*(?:_[A-Z][a-z]*)*$
Sample code:
import re
strings = ["Alpha_beta_Gamma", "Alpha_Beta_Gamma"]
pattern = r'^[A-Z][a-z]*(?:_[A-Z][a-z]*)*$'
for s in strings:
if re.match(pattern, s):
print s + " conforms"
else:
print s + " doesn't conform"
As seen on codepad
Blue and Purple Default links, how to remove?
Hey define color #000
into as like you and modify your css as like this
.navBtn { text-decoration: none; color:#000; }
.navBtn:visited { text-decoration: none; color:#000; }
.navBtn:hover { text-decoration: none; color:#000; }
.navBtn:focus { text-decoration: none; color:#000; }
.navBtn:hover, .navBtn:active { text-decoration: none; color:#000; }
or this
li a { text-decoration: none; color:#000; }
li a:visited { text-decoration: none; color:#000; }
li a:hover { text-decoration: none; color:#000; }
li a:focus { text-decoration: none; color:#000; }
li a:hover, .navBtn:active { text-decoration: none; color:#000; }
Is there a "theirs" version of "git merge -s ours"?
A possible and tested solution for merging branchB into our checked-out branchA:
# in case branchA is not our current branch
git checkout branchA
# make merge commit but without conflicts!!
# the contents of 'ours' will be discarded later
git merge -s ours branchB
# make temporary branch to merged commit
git branch branchTEMP
# get contents of working tree and index to the one of branchB
git reset --hard branchB
# reset to our merged commit but
# keep contents of working tree and index
git reset --soft branchTEMP
# change the contents of the merged commit
# with the contents of branchB
git commit --amend
# get rid off our temporary branch
git branch -D branchTEMP
# verify that the merge commit contains only contents of branchB
git diff HEAD branchB
To automate it you can wrap it into a script using branchA and branchB as arguments.
This solution preserves the first and second parent of the merge commit, just as you would expect of git merge -s theirs branchB
.
Import txt file and having each line as a list
with open('path/to/file') as infile: # try open('...', 'rb') as well
answer = [line.strip().split(',') for line in infile]
If you want the numbers as int
s:
with open('path/to/file') as infile:
answer = [[int(i) for i in line.strip().split(',')] for line in infile]
ORA-28001: The password has expired
I had same problem, i am trying to login database it appear a message with: "ORA-28001: The password has expired" , I have fixed the problem simple steps
1.open command prompt
2.type sqlplus
3.It will ask Enter Password, you can give old password, it will show password has expired ORA-28001
4.It will ask new password and retype password
5.It will change with new password
6.Go to the sql database and try to connect with new password, it will connect.
How to transfer data from JSP to servlet when submitting HTML form
Well, there are plenty of database tutorials online for java (what you're looking for is called JDBC). But if you are using plain servlets, you will have a class that extends HttpServlet
and inside it you will have two methods that look like
public void doPost(HttpServletRequest req, HttpServletResponse resp){
}
and
public void doGet(HttpServletRequest req, HttpServletResponse resp){
}
One of them is called to handle GET
operations and another is used to handle POST
operations. You will then use the HttpServletRequest
object to get the parameters that were passed as part of the form like so:
String name = req.getParameter("name");
Then, once you have the data from the form, it's relatively easy to add it to a database using a JDBC tutorial that is widely available on the web. I also suggest searching for a basic Java servlet tutorial to get you started. It's very easy, although there are a number of steps that need to be configured correctly.
Given a class, see if instance has method (Ruby)
class Foo
def self.fclass_method
end
def finstance_method
end
end
foo_obj = Foo.new
foo_obj.class.methods(false)
=> [:fclass_method]
foo_obj.class.instance_methods(false)
=> [:fclass_method]
Hope this helps you!
How do I add slashes to a string in Javascript?
var str = "This is a single quote: ' and so is this: '";
console.log(str);
var replaced = str.replace(/'/g, "\\'");
console.log(replaced);
Gives you:
This is a single quote: ' and so is this: '
This is a single quote: \' and so is this: \'
Change multiple files
You could use grep and sed together. This allows you to search subdirectories recursively.
Linux: grep -r -l <old> * | xargs sed -i 's/<old>/<new>/g'
OS X: grep -r -l <old> * | xargs sed -i '' 's/<old>/<new>/g'
For grep:
-r recursively searches subdirectories
-l prints file names that contain matches
For sed:
-i extension (Note: An argument needs to be provided on OS X)
Using dig to search for SPF records
The dig utility is pretty convenient to use. The order of the arguments don't really matter.I'll show you some easy examples.
To get all root name servers use
# dig
To get a TXT record of a specific host use
# dig example.com txt
# dig host.example.com txt
To query a specific name server just add @nameserver.tld
# dig host.example.com txt @a.iana-servers.net
The SPF RFC4408 says that SPF records can be stored as SPF or TXT. However nearly all use only TXT records at the moment. So you are pretty safe if you only fetch TXT records.
I made a SPF checker for visualising the SPF records of a domain. It might help you to understand SPF records better. You can find it here:
http://spf.myisp.ch
Release generating .pdb files, why?
Because without the PDB files, it would be impossible to debug a "Release" build by anything other than address-level debugging. Optimizations really do a number on your code, making it very difficult to find the culprit if something goes wrong (say, an exception is thrown). Even setting breakpoints is extremely difficult, because lines of source code cannot be matched up one-to-one with (or even in the same order as) the generated assembly code. PDB files help you and the debugger out, making post-mortem debugging significantly easier.
You make the point that if your software is ready for release, you should have done all your debugging by then. While that's certainly true, there are a couple of important points to keep in mind:
You should also test and debug your application (before you release it) using the "Release" build. That's because turning optimizations on (they are disabled by default under the "Debug" configuration) can sometimes cause subtle bugs to appear that you wouldn't otherwise catch. When you're doing this debugging, you'll want the PDB symbols.
Customers frequently report edge cases and bugs that only crop up under "ideal" conditions. These are things that are almost impossible to reproduce in the lab because they rely on some whacky configuration of that user's machine. If they're particularly helpful customers, they'll report the exception that was thrown and provide you with a stack trace. Or they'll even let you borrow their machine to debug your software remotely. In either of those cases, you'll want the PDB files to assist you.
Profiling should always be done on "Release" builds with optimizations enabled. And once again, the PDB files come in handy, because they allow the assembly instructions being profiled to be mapped back to the source code that you actually wrote.
You can't go back and generate the PDB files after the compile.* If you don't create them during the build, you've lost your opportunity. It doesn't hurt anything to create them. If you don't want to distribute them, you can simply omit them from your binaries. But if you later decide you want them, you're out of luck. Better to always generate them and archive a copy, just in case you ever need them.
If you really want to turn them off, that's always an option. In your project's Properties window, set the "Debug Info" option to "none" for any configuration you want to change.
Do note, however, that the "Debug" and "Release" configurations do by default use different settings for emitting debug information. You will want to keep this setting. The "Debug Info" option is set to "full" for a Debug build, which means that in addition to a PDB file, debugging symbol information is embedded into the assembly. You also get symbols that support cool features like edit-and-continue. In Release mode, the "pdb-only" option is selected, which, like it sounds, includes only the PDB file, without affecting the content of the assembly. So it's not quite as simple as the mere presence or absence of PDB files in your /bin
directory. But assuming you use the "pdb-only" option, the PDB file's presence will in no way affect the run-time performance of your code.
* As Marc Sherman points out in a comment, as long as your source code has not changed (or you can retrieve the original code from a version-control system), you can rebuild it and generate a matching PDB file. At least, usually. This works well most of the time, but the compiler is not guaranteed to generate identical binaries each time you compile the same code, so there may be subtle differences. Worse, if you have made any upgrades to your toolchain in the meantime (like applying a service pack for Visual Studio), the PDBs are even less likely to match. To guarantee the reliable generation of ex postfacto PDB files, you would need to archive not only the source code in your version-control system, but also the binaries for your entire build toolchain to ensure that you could precisely recreate the configuration of your build environment. It goes without saying that it is much easier to simply create and archive the PDB files.
Random state (Pseudo-random number) in Scikit learn
If there is no randomstate provided the system will use a randomstate that is generated internally. So, when you run the program multiple times you might see different train/test data points and the behavior will be unpredictable. In case, you have an issue with your model you will not be able to recreate it as you do not know the random number that was generated when you ran the program.
If you see the Tree Classifiers - either DT or RF, they try to build a try using an optimal plan. Though most of the times this plan might be the same there could be instances where the tree might be different and so the predictions. When you try to debug your model you may not be able to recreate the same instance for which a Tree was built. So, to avoid all this hassle we use a random_state while building a DecisionTreeClassifier or RandomForestClassifier.
PS: You can go a bit in depth on how the Tree is built in DecisionTree to understand this better.
randomstate is basically used for reproducing your problem the same every time it is run. If you do not use a randomstate in traintestsplit, every time you make the split you might get a different set of train and test data points and will not help you in debugging in case you get an issue.
From Doc:
If int, randomstate is the seed used by the random number generator; If RandomState instance, randomstate is the random number generator; If None, the random number generator is the RandomState instance used by np.random.
node.js remove file
fs.unlinkSync()
if you want to remove files synchronously and
fs.unlink()
if you want to remove it asynchronously.
Here you can find a good article.
Running an executable in Mac Terminal
Unix will only run commands if they are available on the system path, as you can view by the $PATH variable
echo $PATH
Executables located in directories that are not on the path cannot be run unless you specify their full location. So in your case, assuming the executable is in the current directory you are working with, then you can execute it as such
./my-exec
Where my-exec
is the name of your program.
Is it possible to center text in select box?
On your select use width: auto and no padding to see how long your text is.
I'm using 100% available width on my select and all of my options have the same length, this allows me to use very simple css.
text-indent will move the text from left, similar to padding-left
120px is my text length - I want to center it so take half of that size and half of the select size, leaving me with 50% - 60px
select{
width: 100%;
text-indent: calc(50% - 60px);
}
What if I have different sizes of options?
It is possible, however, the solution will not be a pretty one.
The former solution might get you really close to being centered if the difference between options isn't like 5 characters.
If you still need to center it more precisely you can do this
Prepare this class:
.realWidth{
width: auto;
}
Apply onChange listener to select element
In that listener apply .realWidth to the select element with
const selectRef = document.getElementById("yourId");
selectRef.classList.add("realWidth");
Get access to the real width of the option.
const widthOfSelect = selectRef.getBoundingClientRect().width / 2;
widthOfSelect is the width you are looking for. Store it in global/component variable.
Remove the realWidth, you don't need it anymore.
selectRef.classList.remove("realWidth");
I am using react, I'm not sure this will work in vanilla, if not you have to find another solution.
<select style={`textIndent: calc(50% - ${widthOfSelect}) %`}> ... </select>
Another solution, however, that is a bad one could be creating the CSS classes with js and putting it to head.
PROS:
- probably works, I haven't tried the dynamic solution but it should work.
CONS:
- if the program is not fast enough user will see the width: auto taking place and thus wonder what's going on. If that is the case just create duplicate select, hide it behind something with a higher z-index and apply the on select listener from the original to the hidden duplicate.
- Might be hard to use if you cant inline the style because of vanilla limitation, but you can make a script to optimize the appendChild to the head.
Alternative for <blink>
No, there isn't in HTML. There is a good reason why the developers chose to go out of their way to remove support for an element whose implementation was otherwise untouched for upwards of a decade.
That said... you could emulate it using a CSS animation, but if I were you, I wouldn't risk CSS animations being axed due to being abused in this manner :)
Regular expression to check if password is "8 characters including 1 uppercase letter, 1 special character, alphanumeric characters"
( # Start of group
(?=.*\d) # must contain at least one digit
(?=.*[A-Z]) # must contain at least one uppercase character
(?=.*\W) # must contain at least one special symbol
. # match anything with previous condition checking
{8,8} # length is exactly 8 characters
) # End of group
In one line:
((?=.*\d)(?=.*[A-Z])(?=.*\W).{8,8})
Edit 2019-05-28:
You need to match entire input string. So, you can enclose the regex between ^
and $
to prevent accidentally assuming partial matches as matching entire input:
^((?=.*\d)(?=.*[A-Z])(?=.*\W).{8,8})$
Sources:
Format Date/Time in XAML in Silverlight
In SL5 I found this to work:
<TextBlock Name="textBlock" Text="{Binding JustificationDate, StringFormat=dd-MMMM-yy hh:mm}">
<TextBlock Name="textBlock" Text="{Binding JustificationDate, StringFormat='Justification Date: \{0:dd-MMMM-yy hh:mm\}'}">