How to set 'X-Frame-Options' on iframe?
You can not really add the x-iframe in your HTML body as it has to be provided by the site owner and it lies within the server rules.
What you can probably do is create a PHP file which loads the content of target URL and iframe that php URL, this should work smoothly.
What's the best practice using a settings file in Python?
I Found this the most useful and easy to use
https://wiki.python.org/moin/ConfigParserExamples
You just create a "myfile.ini" like:
[SectionOne]
Status: Single
Name: Derek
Value: Yes
Age: 30
Single: True
[SectionTwo]
FavoriteColor=Green
[SectionThree]
FamilyName: Johnson
[Others]
Route: 66
And retrieve the data like:
>>> import ConfigParser
>>> Config = ConfigParser.ConfigParser()
>>> Config
<ConfigParser.ConfigParser instance at 0x00BA9B20>
>>> Config.read("myfile.ini")
['c:\\tomorrow.ini']
>>> Config.sections()
['Others', 'SectionThree', 'SectionOne', 'SectionTwo']
>>> Config.options('SectionOne')
['Status', 'Name', 'Value', 'Age', 'Single']
>>> Config.get('SectionOne', 'Status')
'Single'
How to pass credentials to httpwebrequest for accessing SharePoint Library
If you need to run request as the current user from desktop application use CredentialCache.DefaultCredentials
(see on MSDN).
Your code looks fine if you need to run a request from server side code or under a different user.
Please note that you should be careful when storing passwords - consider using the SecureString
version of the constructor.
How to match letters only using java regex, matches method?
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.regex.*;
/* Write an application that prompts the user for a String that contains at least
* five letters and at least five digits. Continuously re-prompt the user until a
* valid String is entered. Display a message indicating whether the user was
* successful or did not enter enough digits, letters, or both.
*/
public class FiveLettersAndDigits {
private static String readIn() { // read input from stdin
StringBuilder sb = new StringBuilder();
int c = 0;
try { // do not use try-with-resources. We don't want to close the stdin stream
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
while ((c = reader.read()) != 0) { // read all characters until null
// We don't want new lines, although we must consume them.
if (c != 13 && c != 10) {
sb.append((char) c);
} else {
break; // break on new line (or else the loop won't terminate)
}
}
// reader.readLine(); // get the trailing new line
} catch (IOException ex) {
System.err.println("Failed to read user input!");
ex.printStackTrace(System.err);
}
return sb.toString().trim();
}
/**
* Check the given input against a pattern
*
* @return the number of matches
*/
private static int getitemCount(String input, String pattern) {
int count = 0;
try {
Pattern p = Pattern.compile(pattern);
Matcher m = p.matcher(input);
while (m.find()) { // count the number of times the pattern matches
count++;
}
} catch (PatternSyntaxException ex) {
System.err.println("Failed to test input String \"" + input + "\" for matches to pattern \"" + pattern + "\"!");
ex.printStackTrace(System.err);
}
return count;
}
private static String reprompt() {
System.out.print("Entered input is invalid! Please enter five letters and five digits in any order: ");
String in = readIn();
return in;
}
public static void main(String[] args) {
int letters = 0, digits = 0;
String in = null;
System.out.print("Please enter five letters and five digits in any order: ");
in = readIn();
while (letters < 5 || digits < 5) { // will keep occuring until the user enters sufficient input
if (null != in && in.length() > 9) { // must be at least 10 chars long in order to contain both
// count the letters and numbers. If there are enough, this loop won't happen again.
letters = getitemCount(in, "[A-Za-z]");
digits = getitemCount(in, "[0-9]");
if (letters < 5 || digits < 5) {
in = reprompt(); // reset in case we need to go around again.
}
} else {
in = reprompt();
}
}
}
}
Should I learn C before learning C++?
If you decide to learn both (and as other people have mentioned, there's no explicit need to learn both), learn C first. Going from C to C++ feels like a natural progression; going the other way feels like deliberately tying one hand behind your back. :-)
jquery json to string?
You could parse the JSON to an object, then create your malformed JSON from the ajavscript object. This may not be the best performance-wise, tho.
Otherwise, if you only need to make very small changes to the string, just treat it as a string, and mangle it using standard javascript.
How do I find the date a video (.AVI .MP4) was actually recorded?
The best way I found of getting the "dateTaken" date for either video or pictures is to use:
Imports Microsoft.WindowsAPICodePack.Shell
Imports Microsoft.WindowsAPICodePack.Shell.PropertySystem
Imports System.IO
Dim picture As ShellObject = ShellObject.FromParsingName(path)
Dim picture As ShellObject = ShellObject.FromParsingName(path)
Dim ItemDate=picture.Properties.System.ItemDate
The above code requires the shell api, which is internal to Microsoft, and does not depend on any other external dll.
How to specify the JDK version in android studio?
You can use cmd + ; for Mac or Ctrl + Alt + Shift + S for Windows/Linux to pull up the Project Structure dialog. In there, you can set the JDK location as well as the Android SDK location.
To get your JDK location, run /usr/libexec/java_home -v 1.7
in terminal. Send 1.7 for Java 7 or 1.8 for Java 8.
Getting net::ERR_UNKNOWN_URL_SCHEME while calling telephone number from HTML page in Android
Try this way,hope this will help you to solve your problem.
main.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:gravity="center">
<WebView
android:id="@+id/webView"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</LinearLayout>
MyActivity.java
public class MyActivity extends Activity {
private WebView webView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
webView = (WebView) findViewById(R.id.webView);
webView.loadData("<a href=\"tel:+1800229933\">Call us free!</a>", "text/html", "utf-8");
}
}
Please add this permission in AndroidManifest.xml
<uses-permission android:name="android.permission.CALL_PHONE"/>
SQLAlchemy: What's the difference between flush() and commit()?
Use flush when you need to write, for example to get a primary key ID from an autoincrementing counter.
john=Person(name='John Smith', parent=None)
session.add(john)
session.flush()
son=Person(name='Bill Smith', parent=john.id)
Without flushing, john would never get an ID from the DB and so couldn't represent the parent/child relationship in code.
Like others have said, without commit()
none of this will be permanently persisted to DB.
How to find largest objects in a SQL Server database?
If you are using Sql Server Management Studio 2008 there are certain data fields you can view in the object explorer details window. Simply browse to and select the tables folder. In the details view you are able to right-click the column titles and add fields to the "report". Your mileage may vary if you are on SSMS 2008 express.
Getting byte array through input type = file
_x000D_
_x000D_
$(document).ready(function(){_x000D_
(function (document) {_x000D_
var input = document.getElementById("files"),_x000D_
output = document.getElementById("result"),_x000D_
fileData; // We need fileData to be visible to getBuffer._x000D_
_x000D_
// Eventhandler for file input. _x000D_
function openfile(evt) {_x000D_
var files = input.files;_x000D_
// Pass the file to the blob, not the input[0]._x000D_
fileData = new Blob([files[0]]);_x000D_
// Pass getBuffer to promise._x000D_
var promise = new Promise(getBuffer);_x000D_
// Wait for promise to be resolved, or log error._x000D_
promise.then(function(data) {_x000D_
// Here you can pass the bytes to another function._x000D_
output.innerHTML = data.toString();_x000D_
console.log(data);_x000D_
}).catch(function(err) {_x000D_
console.log('Error: ',err);_x000D_
});_x000D_
}_x000D_
_x000D_
/* _x000D_
Create a function which will be passed to the promise_x000D_
and resolve it when FileReader has finished loading the file._x000D_
*/_x000D_
function getBuffer(resolve) {_x000D_
var reader = new FileReader();_x000D_
reader.readAsArrayBuffer(fileData);_x000D_
reader.onload = function() {_x000D_
var arrayBuffer = reader.result_x000D_
var bytes = new Uint8Array(arrayBuffer);_x000D_
resolve(bytes);_x000D_
}_x000D_
}_x000D_
_x000D_
// Eventlistener for file input._x000D_
input.addEventListener('change', openfile, false);_x000D_
}(document));_x000D_
});
_x000D_
<!DOCTYPE html>_x000D_
<html>_x000D_
<head>_x000D_
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>_x000D_
</head>_x000D_
<body>_x000D_
_x000D_
<input type="file" id="files"/>_x000D_
<div id="result"></div>_x000D_
</body>_x000D_
</html>
_x000D_
_x000D_
_x000D_
How can I access "static" class variables within class methods in Python?
As with all good examples, you've simplified what you're actually trying to do. This is good, but it is worth noting that python has a lot of flexibility when it comes to class versus instance variables. The same can be said of methods. For a good list of possibilities, I recommend reading Michael Fötsch' new-style classes introduction, especially sections 2 through 6.
One thing that takes a lot of work to remember when getting started is that python is not java. More than just a cliche. In java, an entire class is compiled, making the namespace resolution real simple: any variables declared outside a method (anywhere) are instance (or, if static, class) variables and are implicitly accessible within methods.
With python, the grand rule of thumb is that there are three namespaces that are searched, in order, for variables:
- The function/method
- The current module
- Builtins
{begin pedagogy}
There are limited exceptions to this. The main one that occurs to me is that, when a class definition is being loaded, the class definition is its own implicit namespace. But this lasts only as long as the module is being loaded, and is entirely bypassed when within a method. Thus:
>>> class A(object):
foo = 'foo'
bar = foo
>>> A.foo
'foo'
>>> A.bar
'foo'
but:
>>> class B(object):
foo = 'foo'
def get_foo():
return foo
bar = get_foo()
Traceback (most recent call last):
File "<pyshell#11>", line 1, in <module>
class B(object):
File "<pyshell#11>", line 5, in B
bar = get_foo()
File "<pyshell#11>", line 4, in get_foo
return foo
NameError: global name 'foo' is not defined
{end pedagogy}
In the end, the thing to remember is that you do have access to any of the variables you want to access, but probably not implicitly. If your goals are simple and straightforward, then going for Foo.bar or self.bar will probably be sufficient. If your example is getting more complicated, or you want to do fancy things like inheritance (you can inherit static/class methods!), or the idea of referring to the name of your class within the class itself seems wrong to you, check out the intro I linked.
Passing arguments to require (when loading module)
I'm not sure if this will still be useful to people, but with ES6 I have a way to do it that I find clean and useful.
class MyClass {
constructor ( arg1, arg2, arg3 )
myFunction1 () {...}
myFunction2 () {...}
myFunction3 () {...}
}
module.exports = ( arg1, arg2, arg3 ) => { return new MyClass( arg1,arg2,arg3 ) }
And then you get your expected behaviour.
var MyClass = require('/MyClass.js')( arg1, arg2, arg3 )
Angular Material: mat-select not selecting default
_x000D_
_x000D_
public options2 = [_x000D_
{"id": 1, "name": "a"},_x000D_
{"id": 2, "name": "b"}_x000D_
]_x000D_
_x000D_
YourFormGroup = FormGroup; _x000D_
mode: 'create' | 'update' = 'create';_x000D_
_x000D_
constructor(@Inject(MAT_DIALOG_DATA) private defaults: defautValuesCpnt,_x000D_
private fb: FormBuilder,_x000D_
private cd: ChangeDetectorRef) {_x000D_
}_x000D_
_x000D_
ngOnInit() {_x000D_
_x000D_
if (this.defaults) {_x000D_
this.mode = 'update';_x000D_
} else {_x000D_
this.defaults = {} as Cpnt;_x000D_
}_x000D_
_x000D_
this.YourFormGroup.patchValue({_x000D_
..._x000D_
fCtrlName: this.options2.find(x => x.name === this.defaults.name).id,_x000D_
... _x000D_
});_x000D_
_x000D_
this.YourFormGroup = this.fb.group({_x000D_
fCtrlName: [ , Validators.required]_x000D_
});_x000D_
_x000D_
}
_x000D_
<div>_x000D_
<mat-select formControlName="fCtrlName"> <mat-option_x000D_
*ngFor="let option of options2"_x000D_
value="{{ option.id }}">_x000D_
{{ option.name }}_x000D_
</mat-option>_x000D_
</mat-select>_x000D_
</div>
_x000D_
_x000D_
_x000D_
how to overwrite css style
You can add your styles in the required page after the external style sheet so they'll cascade and overwrite the first set of rules.
<link rel="stylesheet" href="allpages.css">
<style>
.flex-control-thumbs li {
width: auto;
float: none;
}
</style>
2D character array initialization in C
How to create an array size 5 containing pointers to characters:
char *array_of_pointers[ 5 ]; //array size 5 containing pointers to char
char m = 'm'; //character value holding the value 'm'
array_of_pointers[0] = &m; //assign m ptr into the array position 0.
printf("%c", *array_of_pointers[0]); //get the value of the pointer to m
How to create a pointer to an array of characters:
char (*pointer_to_array)[ 5 ]; //A pointer to an array containing 5 chars
char m = 'm'; //character value holding the value 'm'
*pointer_to_array[0] = m; //dereference array and put m in position 0
printf("%c", (*pointer_to_array)[0]); //dereference array and get position 0
How to create an 2D array containing pointers to characters:
char *array_of_pointers[5][2];
//An array size 5 containing arrays size 2 containing pointers to char
char m = 'm';
//character value holding the value 'm'
array_of_pointers[4][1] = &m;
//Get position 4 of array, then get position 1, then put m ptr in there.
printf("%c", *array_of_pointers[4][1]);
//Get position 4 of array, then get position 1 and dereference it.
How to create a pointer to an 2D array of characters:
char (*pointer_to_array)[5][2];
//A pointer to an array size 5 each containing arrays size 2 which hold chars
char m = 'm';
//character value holding the value 'm'
(*pointer_to_array)[4][1] = m;
//dereference array, Get position 4, get position 1, put m there.
printf("%c", (*pointer_to_array)[4][1]);
//dereference array, Get position 4, get position 1
To help you out with understanding how humans should read complex C/C++ declarations read this: http://www.programmerinterview.com/index.php/c-cplusplus/c-declarations/
Name attribute in @Entity and @Table
@Entity(name = "someThing") => this name will be used to name the Entity
@Table(name = "someThing") => this name will be used to name a table in DB
So, in the first case your table and entity will have the same name, that will allow you to access your table with the same name as the entity while writing HQL or JPQL.
And in second case while writing queries you have to use the name given in @Entity and the name given in @Table will be used to name the table in the DB.
So in HQL your someThing will refer to otherThing in the DB.
How to get nth jQuery element
Live Example to access and remove the Nth element with jQuery:
<html>
<head></head>
<body>
<script type="text/javascript"
src="http://code.jquery.com/jquery-2.1.0.min.js"></script>
<script type="text/javascript">
$(document).ready(function(){
$('li:eq(1)').hide();
});
</script>
<ol>
<li>First</li>
<li>Second</li>
<li>Third</li>
</ol>
</body>
</html>
When it runs, there are two items in the ordered list that show, First, and Third. The second was hidden.
What is the difference between linear regression and logistic regression?
Logistic Regression is used in predicting categorical outputs like Yes/No, Low/Medium/High etc. You have basically 2 types of logistic regression Binary Logistic Regression (Yes/No, Approved/Disapproved) or Multi-class Logistic regression (Low/Medium/High, digits from 0-9 etc)
On the other hand, linear regression is if your dependent variable (y) is continuous.
y = mx + c is a simple linear regression equation (m = slope and c is the y-intercept). Multilinear regression has more than 1 independent variable (x1,x2,x3 ... etc)
"unexpected token import" in Nodejs5 and babel?
I have done the following to overcome the problem (ex.js script)
problem
$ cat ex.js
import { Stack } from 'es-collections';
console.log("Successfully Imported");
$ node ex.js
/Users/nsaboo/ex.js:1
(function (exports, require, module, __filename, __dirname) { import { Stack } from 'es-collections';
^^^^^^
SyntaxError: Unexpected token import
at createScript (vm.js:80:10)
at Object.runInThisContext (vm.js:152:10)
at Module._compile (module.js:624:28)
at Object.Module._extensions..js (module.js:671:10)
at Module.load (module.js:573:32)
at tryModuleLoad (module.js:513:12)
at Function.Module._load (module.js:505:3)
at Function.Module.runMain (module.js:701:10)
at startup (bootstrap_node.js:194:16)
at bootstrap_node.js:618:3
solution
# npm package installation
npm install --save-dev babel-preset-env babel-cli es-collections
# .babelrc setup
$ cat .babelrc
{
"presets": [
["env", {
"targets": {
"node": "current"
}
}]
]
}
# execution with node
$ npx babel ex.js --out-file ex-new.js
$ node ex-new.js
Successfully Imported
# or execution with babel-node
$ babel-node ex.js
Successfully Imported
What is the difference between x86 and x64
Oddly enough it was an Intel thing not a Microsoft thing. X86 referred to the Intel CPU series from the 8086 to the 80486. The Pentium series still use the same addressing system. The x64 refers to the I64 addressing system that Intel came out with later for the 64-bit CPUs. So Windows was just following Intel's architecture naming.
Convert seconds into days, hours, minutes and seconds
function convert($seconds){
$string = "";
$days = intval(intval($seconds) / (3600*24));
$hours = (intval($seconds) / 3600) % 24;
$minutes = (intval($seconds) / 60) % 60;
$seconds = (intval($seconds)) % 60;
if($days> 0){
$string .= "$days days ";
}
if($hours > 0){
$string .= "$hours hours ";
}
if($minutes > 0){
$string .= "$minutes minutes ";
}
if ($seconds > 0){
$string .= "$seconds seconds";
}
return $string;
}
echo convert(3744000);
Export data from R to Excel
I have been trying out the different packages including the function:
install.packages ("prettyR")
library (prettyR)
delimit.table (Corrvar,"Name the csv.csv")
## Corrvar
is a name of an object from an output I had on scaled variables to run a regression.
However I tried this same code for an output from another analysis (occupancy models model selection output) and it did not work. And after many attempts and exploration I:
- copied the output from R (Ctrl+c)
- in Excel sheet I pasted it (Ctrl+V)
- Select the first column where the data is
In the "Data" vignette, click on "Text to column"
Select Delimited option, click next
Tick space box in "Separator", click next
Click Finalize (End)
Your output now should be in a form you can manipulate easy in excel. So perhaps not the fanciest option but it does the trick if you just want to explore your data in another way.
PS. If the labels in excel are not the exact one it is because Im translating the lables from my spanish excel.
Is there a way to get a list of column names in sqlite?
Quick, interactive way to see column names
If you're working interactively in Python and just want to quickly 'see' the column names, I found cursor.description to work.
import sqlite3
conn = sqlite3.connect('test-db.db')
cursor = conn.execute('select * from mytable')
cursor.description
Outputs something like this:
(('Date', None, None, None, None, None, None),
('Object-Name', None, None, None, None, None, None),
('Object-Count', None, None, None, None, None, None))
Or, quick way to access and print them out.
colnames = cursor.description
for row in colnames:
print row[0]
Outputs something like this:
Date
Object-Name
Object-Count
How to read multiple text files into a single RDD?
Use union
as follows:
val sc = new SparkContext(...)
val r1 = sc.textFile("xxx1")
val r2 = sc.textFile("xxx2")
...
val rdds = Seq(r1, r2, ...)
val bigRdd = sc.union(rdds)
Then the bigRdd
is the RDD with all files.
Run "mvn clean install" in Eclipse
Right click on pom.xml, Run As, you should see the list of m2 options if you have Maven installed, you can select Maven Clean from there
Using import fs from 'fs'
ES6 modules support in Node.js is fairly recent; even in the bleeding-edge versions, it is still experimental. With Node.js 10, you can start Node.js with the --experimental-modules
flag, and it will likely work.
To import on older Node.js versions - or standard Node.js 10 - use CommonJS syntax:
const fs = require('fs');
Create nice column output in python
This is a little late to the party, and a shameless plug for a package I wrote, but you can also check out the Columnar package.
It takes a list of lists of input and a list of headers and outputs a table-formatted string. This snippet creates a docker-esque table:
from columnar import columnar
headers = ['name', 'id', 'host', 'notes']
data = [
['busybox', 'c3c37d5d-38d2-409f-8d02-600fd9d51239', 'linuxnode-1-292735', 'Test server.'],
['alpine-python', '6bb77855-0fda-45a9-b553-e19e1a795f1e', 'linuxnode-2-249253', 'The one that runs python.'],
['redis', 'afb648ba-ac97-4fb2-8953-9a5b5f39663e', 'linuxnode-3-3416918', 'For queues and stuff.'],
['app-server', 'b866cd0f-bf80-40c7-84e3-c40891ec68f9', 'linuxnode-4-295918', 'A popular destination.'],
['nginx', '76fea0f0-aa53-4911-b7e4-fae28c2e469b', 'linuxnode-5-292735', 'Traffic Cop'],
]
table = columnar(data, headers, no_borders=True)
print(table)
Or you can get a little fancier with colors and borders.
To read more about the column-sizing algorithm and see the rest of the API you can check out the link above or see the Columnar GitHub Repo
Facebook api: (#4) Application request limit reached
The Facebook API limit isn't really documented, but apparently it's something like: 600 calls per 600 seconds, per token & per IP. As the site is restricted, quoting the relevant part:
After some testing and discussion with the Facebook platform team, there is no official limit I'm aware of or can find in the documentation. However, I've found 600 calls per 600 seconds, per token & per IP to be about where they stop you. I've also seen some application based rate limiting but don't have any numbers.
As a general rule, one call per second should not get rate limited. On the surface this seems very restrictive but remember you can batch certain calls and use the subscription API to get changes.
As you can access the Graph API on the client side via the Javascript SDK; I think if you travel your request for photos from the client, you won't hit any application limit
as it's the user (each one with unique id) who's fetching data, not your application server (unique ID).
This may mean a huge refactor if everything you do go through a server. But it seems like the best solution if you have so many request (as it'll give a breath to your server).
Else, you can try batch
request, but I guess you're already going this way if you have big traffic.
If nothing of this works, according to the Facebook Platform Policy you should contact them.
If you exceed, or plan to exceed, any of the following thresholds please contact us as you may be subject to additional terms: (>5M MAU) or (>100M API calls per day) or (>50M impressions per day).
Using Excel VBA to export data to MS Access table
@Ahmed
Below is code that specifies fields from a named range for insertion into MS Access. The nice thing about this code is that you can name your fields in Excel whatever the hell you want (If you use * then the fields have to match exactly between Excel and Access) as you can see I have named an Excel column "Haha" even though the Access column is called "dte".
Sub test()
dbWb = Application.ActiveWorkbook.FullName
dsh = "[" & Application.ActiveSheet.Name & "$]" & "Data2" 'Data2 is a named range
sdbpath = "C:\Users\myname\Desktop\Database2.mdb"
sCommand = "INSERT INTO [main] ([dte], [test1], [values], [values2]) SELECT [haha],[test1],[values],[values2] FROM [Excel 8.0;HDR=YES;DATABASE=" & dbWb & "]." & dsh
Dim dbCon As New ADODB.Connection
Dim dbCommand As New ADODB.Command
dbCon.Open "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & sdbpath & "; Jet OLEDB:Database Password=;"
dbCommand.ActiveConnection = dbCon
dbCommand.CommandText = sCommand
dbCommand.Execute
dbCon.Close
End Sub
How to access the content of an iframe with jQuery?
<html>
<head>
<title></title>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.js"></script>
<script type="text/javascript">
$(function() {
//here you have the control over the body of the iframe document
var iBody = $("#iView").contents().find("body");
//here you have the control over any element (#myContent)
var myContent = iBody.find("#myContent");
});
</script>
</head>
<body>
<iframe src="mifile.html" id="iView" style="width:200px;height:70px;border:dotted 1px red" frameborder="0"></iframe>
</body>
</html>
Execute a batch file on a remote PC using a batch file on local PC
While I would recommend against this.
But you can use shutdown as client if the target machine has remote shutdown enabled and is in the same workgroup.
Example:
shutdown.exe /s /m \\<target-computer-name> /t 00
replacing <target-computer-name>
with the URI for the target machine,
Otherwise, if you want to trigger this through Apache, you'll need to configure the batch script as a CGI script by putting AddHandler cgi-script .bat
and Options +ExecCGI
into either a local .htaccess
file or in the main configuration for your Apache install.
Then you can just call the .bat
file containing the shutdown.exe
command from your browser.
What is difference between sleep() method and yield() method of multi threading?
Both methods are used to prevent thread execution.
But specifically,
sleep():
purpose:if a thread don't want to perform any operation for particular amount of time then we should go for sleep().for e.x. slide show .
yield():
purpose:if a thread wants to pause it's execution to give chance of execution to another waiting threads of same priority.thread which requires more execution time should call yield() in between execution.
Note:some platform may not provide proper support for yield() . because underlying system may not provide support for preemptive scheduling.moreover yield() is native method.
How can I parse a local JSON file from assets folder into a ListView?
Source code How to fetch Local Json from Assets folder
https://drive.google.com/open?id=1NG1amTVWPNViim_caBr8eeB4zczTDK2p
{
"responseCode": "200",
"responseMessage": "Recode Fetch Successfully!",
"responseTime": "10:22",
"employeesList": [
{
"empId": "1",
"empName": "Keshav",
"empFatherName": "Mr Ramesh Chand Gera",
"empSalary": "9654267338",
"empDesignation": "Sr. Java Developer",
"leaveBalance": "3",
"pfBalance": "60,000",
"pfAccountNo.": "12345678"
},
{
"empId": "2",
"empName": "Ram",
"empFatherName": "Mr Dasrath ji",
"empSalary": "9999999999",
"empDesignation": "Sr. Java Developer",
"leaveBalance": "3",
"pfBalance": "60,000",
"pfAccountNo.": "12345678"
},
{
"empId": "3",
"empName": "Manisha",
"empFatherName": "Mr Ramesh Chand Gera",
"empSalary": "8826420999",
"empDesignation": "BusinessMan",
"leaveBalance": "3",
"pfBalance": "60,000",
"pfAccountNo.": "12345678"
},
{
"empId": "4",
"empName": "Happy",
"empFatherName": "Mr Ramesh Chand Gera",
"empSalary": "9582401701",
"empDesignation": "Two Wheeler",
"leaveBalance": "3",
"pfBalance": "60,000",
"pfAccountNo.": "12345678"
},
{
"empId": "5",
"empName": "Ritu",
"empFatherName": "Mr Keshav Gera",
"empSalary": "8888888888",
"empDesignation": "Sararat Vibhag",
"leaveBalance": "3",
"pfBalance": "60,000",
"pfAccountNo.": "12345678"
}
]
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_employee);
emp_recycler_view = (RecyclerView) findViewById(R.id.emp_recycler_view);
emp_recycler_view.setLayoutManager(new LinearLayoutManager(EmployeeActivity.this,
LinearLayoutManager.VERTICAL, false));
emp_recycler_view.setItemAnimator(new DefaultItemAnimator());
employeeAdapter = new EmployeeAdapter(EmployeeActivity.this , employeeModelArrayList);
emp_recycler_view.setAdapter(employeeAdapter);
getJsonFileFromLocally();
}
public String loadJSONFromAsset() {
String json = null;
try {
InputStream is = EmployeeActivity.this.getAssets().open("employees.json"); //TODO Json File name from assets folder
int size = is.available();
byte[] buffer = new byte[size];
is.read(buffer);
is.close();
json = new String(buffer, "UTF-8");
} catch (IOException ex) {
ex.printStackTrace();
return null;
}
return json;
}
private void getJsonFileFromLocally() {
try {
JSONObject jsonObject = new JSONObject(loadJSONFromAsset());
String responseCode = jsonObject.getString("responseCode");
String responseMessage = jsonObject.getString("responseMessage");
String responseTime = jsonObject.getString("responseTime");
Log.e("keshav", "responseCode -->" + responseCode);
Log.e("keshav", "responseMessage -->" + responseMessage);
Log.e("keshav", "responseTime -->" + responseTime);
if(responseCode.equals("200")){
}else{
Toast.makeText(this, "No Receord Found ", Toast.LENGTH_SHORT).show();
}
JSONArray jsonArray = jsonObject.getJSONArray("employeesList"); //TODO pass array object name
Log.e("keshav", "m_jArry -->" + jsonArray.length());
for (int i = 0; i < jsonArray.length(); i++)
{
EmployeeModel employeeModel = new EmployeeModel();
JSONObject jsonObjectEmployee = jsonArray.getJSONObject(i);
String empId = jsonObjectEmployee.getString("empId");
String empName = jsonObjectEmployee.getString("empName");
String empDesignation = jsonObjectEmployee.getString("empDesignation");
String empSalary = jsonObjectEmployee.getString("empSalary");
String empFatherName = jsonObjectEmployee.getString("empFatherName");
employeeModel.setEmpId(""+empId);
employeeModel.setEmpName(""+empName);
employeeModel.setEmpDesignation(""+empDesignation);
employeeModel.setEmpSalary(""+empSalary);
employeeModel.setEmpFatherNamer(""+empFatherName);
employeeModelArrayList.add(employeeModel);
} // for
if(employeeModelArrayList!=null) {
employeeAdapter.dataChanged(employeeModelArrayList);
}
} catch (JSONException e) {
e.printStackTrace();
}
}
Auto-size dynamic text to fill fixed size container
I didn't find any of the previous solutions to be adequate enough due to bad performance, so I made my own that uses simple math instead of looping. Should work fine in all browsers as well.
According to this performance test case it is much faster then the other solutions found here.
(function($) {
$.fn.textfill = function(maxFontSize) {
maxFontSize = parseInt(maxFontSize, 10);
return this.each(function(){
var ourText = $("span", this),
parent = ourText.parent(),
maxHeight = parent.height(),
maxWidth = parent.width(),
fontSize = parseInt(ourText.css("fontSize"), 10),
multiplier = maxWidth/ourText.width(),
newSize = (fontSize*(multiplier-0.1));
ourText.css(
"fontSize",
(maxFontSize > 0 && newSize > maxFontSize) ?
maxFontSize :
newSize
);
});
};
})(jQuery);
If you want to contribute I've added this to Gist.
How do I get an animated gif to work in WPF?
I had this issue, until I discovered that in WPF4, you can simulate your own keyframe image animations. First, split your animation into a series of images, title them something like "Image1.gif", "Image2,gif", and so on. Import those images into your solution resources. I'm assuming you put them in the default resource location for images.
You are going to use the Image control. Use the following XAML code. I've removed the non-essentials.
<Image Name="Image1">
<Image.Triggers>
<EventTrigger RoutedEvent="Image.Loaded"
<EventTrigger.Actions>
<BeginStoryboard>
<Storyboard>
<ObjectAnimationUsingKeyFrames Duration="0:0:1" Storyboard.TargetProperty="Source" RepeatBehavior="Forever">
<DiscreteObjectKeyFrames KeyTime="0:0:0">
<DiscreteObjectKeyFrame.Value>
<BitmapImage UriSource="Images/Image1.gif"/>
</DiscreteObjectKeyFrame.Value>
</DiscreteObjectKeyFrames>
<DiscreteObjectKeyFrames KeyTime="0:0:0.25">
<DiscreteObjectKeyFrame.Value>
<BitmapImage UriSource="Images/Image2.gif"/>
</DiscreteObjectKeyFrame.Value>
</DiscreteObjectKeyFrames>
<DiscreteObjectKeyFrames KeyTime="0:0:0.5">
<DiscreteObjectKeyFrame.Value>
<BitmapImage UriSource="Images/Image3.gif"/>
</DiscreteObjectKeyFrame.Value>
</DiscreteObjectKeyFrames>
<DiscreteObjectKeyFrames KeyTime="0:0:0.75">
<DiscreteObjectKeyFrame.Value>
<BitmapImage UriSource="Images/Image4.gif"/>
</DiscreteObjectKeyFrame.Value>
</DiscreteObjectKeyFrames>
<DiscreteObjectKeyFrames KeyTime="0:0:1">
<DiscreteObjectKeyFrame.Value>
<BitmapImage UriSource="Images/Image5.gif"/>
</DiscreteObjectKeyFrame.Value>
</DiscreteObjectKeyFrames>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</BeginStoryboard>
</EventTrigger.Actions>
</EventTrigger>
</Image.Triggers>
</Image>
Convert long/lat to pixel x/y on a given picture
The translation you are addressing has to do with Map Projection, which is how the spherical surface of our world is translated into a 2 dimensional rendering. There are multiple ways (projections) to render the world on a 2-D surface.
If your maps are using just a specific projection (Mercator being popular), you should be able to find the equations, some sample code, and/or some library (e.g. one Mercator solution - Convert Lat/Longs to X/Y Co-ordinates. If that doesn't do it, I'm sure you can find other samples - https://stackoverflow.com/search?q=mercator. If your images aren't map(s) using a Mercator projection, you'll need to determine what projection it does use to find the right translation equations.
If you are trying to support multiple map projections (you want to support many different maps that use different projections), then you definitely want to use a library like PROJ.4, but again I'm not sure what you'll find for Javascript or PHP.
Get position/offset of element relative to a parent container?
in pure js just use offsetLeft
and offsetTop
properties.
Example fiddle: http://jsfiddle.net/WKZ8P/
_x000D_
_x000D_
var elm = document.querySelector('span');_x000D_
console.log(elm.offsetLeft, elm.offsetTop);
_x000D_
p { position:relative; left:10px; top:85px; border:1px solid blue; }_x000D_
span{ position:relative; left:30px; top:35px; border:1px solid red; }
_x000D_
<p>_x000D_
<span>paragraph</span>_x000D_
</p>
_x000D_
_x000D_
_x000D_
How to find all tables that have foreign keys that reference particular table.column and have values for those foreign keys?
Listing all foreign keys in a db including description
SELECT
i1.CONSTRAINT_NAME, i1.TABLE_NAME,i1.COLUMN_NAME,
i1.REFERENCED_TABLE_SCHEMA,i1.REFERENCED_TABLE_NAME, i1.REFERENCED_COLUMN_NAME,
i2.UPDATE_RULE, i2.DELETE_RULE
FROM
information_schema.KEY_COLUMN_USAGE AS i1
INNER JOIN
information_schema.REFERENTIAL_CONSTRAINTS AS i2
ON i1.CONSTRAINT_NAME = i2.CONSTRAINT_NAME
WHERE i1.REFERENCED_TABLE_NAME IS NOT NULL
AND i1.TABLE_SCHEMA ='db_name';
restricting to a specific column in a table table
AND i1.table_name = 'target_tb_name' AND i1.column_name = 'target_col_name'
JavaScript set object key by variable
You need to make the object first, then use []
to set it.
var key = "happyCount";
var obj = {};
obj[key] = someValueArray;
myArray.push(obj);
UPDATE 2018:
If you're able to use ES6 and Babel, you can use this new feature:
{
[yourKeyVariable]: someValueArray,
}
Ruby, Difference between exec, system and %x() or Backticks
system
The system
method calls a system program. You have to provide the command as a string argument to this method. For example:
>> system("date")
Wed Sep 4 22:03:44 CEST 2013
=> true
The invoked program will use the current STDIN
, STDOUT
and STDERR
objects of your Ruby program. In fact, the actual return value is either true
, false
or nil
. In the example the date was printed through the IO object of STDIN
. The method will return true
if the process exited with a zero status, false
if the process exited with a non-zero status and nil
if the execution failed.
As of Ruby 2.6, passing exception: true
will raise an exception instead of returning false
or nil
:
>> system('invalid')
=> nil
>> system('invalid', exception: true)
Traceback (most recent call last):
...
Errno::ENOENT (No such file or directory - invalid)
Another side effect is that the global variable $?
is set to a Process::Status
object. This object will contain information about the call itself, including the process identifier (PID) of the invoked process and the exit status.
>> system("date")
Wed Sep 4 22:11:02 CEST 2013
=> true
>> $?
=> #<Process::Status: pid 15470 exit 0>
Backticks
Backticks (``) call a system program and return its output. As opposed to the first approach, the command is not provided through a string, but by putting it inside a backticks pair.
>> `date`
=> Wed Sep 4 22:22:51 CEST 2013
The global variable $?
is set through the backticks, too. With backticks you can also make use string interpolation.
%x()
Using %x
is an alternative to the backticks style. It will return the output, too. Like its relatives %w
and %q
(among others), any delimiter will suffice as long as bracket-style delimiters match. This means %x(date)
, %x{date}
and %x-date-
are all synonyms. Like backticks %x
can make use of string interpolation.
exec
By using Kernel#exec
the current process (your Ruby script) is replaced with the process invoked through exec
. The method can take a string as argument. In this case the string will be subject to shell expansion. When using more than one argument, then the first one is used to execute a program and the following are provided as arguments to the program to be invoked.
Open3.popen3
Sometimes the required information is written to standard input or standard error and you need to get control over those as well. Here Open3.popen3
comes in handy:
require 'open3'
Open3.popen3("curl http://example.com") do |stdin, stdout, stderr, thread|
pid = thread.pid
puts stdout.read.chomp
end
How can I modify the size of column in a MySQL table?
ALTER TABLE <tablename> CHANGE COLUMN <colname> <colname> VARCHAR(65536);
You have to list the column name twice, even if you aren't changing its name.
Note that after you make this change, the data type of the column will be MEDIUMTEXT
.
Miky D is correct, the MODIFY
command can do this more concisely.
Re the MEDIUMTEXT
thing: a MySQL row can be only 65535 bytes (not counting BLOB/TEXT columns). If you try to change a column to be too large, making the total size of the row 65536 or greater, you may get an error. If you try to declare a column of VARCHAR(65536)
then it's too large even if it's the only column in that table, so MySQL automatically converts it to a MEDIUMTEXT
data type.
mysql> create table foo (str varchar(300));
mysql> alter table foo modify str varchar(65536);
mysql> show create table foo;
CREATE TABLE `foo` (
`str` mediumtext
) ENGINE=MyISAM DEFAULT CHARSET=latin1
1 row in set (0.00 sec)
I misread your original question, you want VARCHAR(65353)
, which MySQL can do, as long as that column size summed with the other columns in the table doesn't exceed 65535.
mysql> create table foo (str1 varchar(300), str2 varchar(300));
mysql> alter table foo modify str2 varchar(65353);
ERROR 1118 (42000): Row size too large.
The maximum row size for the used table type, not counting BLOBs, is 65535.
You have to change some columns to TEXT or BLOBs
Node JS Promise.all and forEach
I had through the same situation. I solved using two Promise.All().
I think was really good solution, so I published it on npm: https://www.npmjs.com/package/promise-foreach
I think your code will be something like this
var promiseForeach = require('promise-foreach')
var jsonItems = [];
promiseForeach.each(jsonItems,
[function (jsonItems){
return new Promise(function(resolve, reject){
if(jsonItems.type === 'file'){
jsonItems.getFile().then(function(file){ //or promise.all?
resolve(file.getSize())
})
}
})
}],
function (result, current) {
return {
type: current.type,
size: jsonItems.result[0]
}
},
function (err, newList) {
if (err) {
console.error(err)
return;
}
console.log('new jsonItems : ', newList)
})
In which case do you use the JPA @JoinTable annotation?
It's the only solution to map a ManyToMany association : you need a join table between the two entities tables to map the association.
It's also used for OneToMany (usually unidirectional) associations when you don't want to add a foreign key in the table of the many side and thus keep it independent of the one side.
Search for @JoinTable in the hibernate documentation for explanations and examples.
Simple Popup by using Angular JS
If you are using bootstrap.js then the below code might be useful. This is very simple. Dont have to write anything in js to invoke the pop-up.
Source :http://www.w3schools.com/bootstrap/tryit.asp?filename=trybs_modal&stacked=h
<!DOCTYPE html>
<html lang="en">
<head>
<title>Bootstrap Example</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.0/jquery.min.js"></script>
<script src="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>
</head>
<body>
<div class="container">
<h2>Modal Example</h2>
<!-- Trigger the modal with a button -->
<button type="button" class="btn btn-info btn-lg" data-toggle="modal" data-target="#myModal">Open Modal</button>
<!-- Modal -->
<div class="modal fade" id="myModal" role="dialog">
<div class="modal-dialog">
<!-- Modal content-->
<div class="modal-content">
<div class="modal-header">
<button type="button" class="close" data-dismiss="modal">×</button>
<h4 class="modal-title">Modal Header</h4>
</div>
<div class="modal-body">
<p>Some text in the modal.</p>
</div>
<div class="modal-footer">
<button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
</div>
</div>
</div>
</div>
</div>
</body>
</html>
Why can't radio buttons be "readonly"?
For the non-selected radio buttons, flag them as disabled. This prevents them from responding to user input and clearing out the checked radio button. For example:
<input type="radio" name="var" checked="yes" value="Yes"></input>
<input type="radio" name="var" disabled="yes" value="No"></input>
Google Maps V3 marker with label
If you just want to show label below the marker, then you can extend google maps Marker to add a setter method for label and you can define the label object by extending google maps overlayView like this..
<script type="text/javascript">
var point = { lat: 22.5667, lng: 88.3667 };
var markerSize = { x: 22, y: 40 };
google.maps.Marker.prototype.setLabel = function(label){
this.label = new MarkerLabel({
map: this.map,
marker: this,
text: label
});
this.label.bindTo('position', this, 'position');
};
var MarkerLabel = function(options) {
this.setValues(options);
this.span = document.createElement('span');
this.span.className = 'map-marker-label';
};
MarkerLabel.prototype = $.extend(new google.maps.OverlayView(), {
onAdd: function() {
this.getPanes().overlayImage.appendChild(this.span);
var self = this;
this.listeners = [
google.maps.event.addListener(this, 'position_changed', function() { self.draw(); })];
},
draw: function() {
var text = String(this.get('text'));
var position = this.getProjection().fromLatLngToDivPixel(this.get('position'));
this.span.innerHTML = text;
this.span.style.left = (position.x - (markerSize.x / 2)) - (text.length * 3) + 10 + 'px';
this.span.style.top = (position.y - markerSize.y + 40) + 'px';
}
});
function initialize(){
var myLatLng = new google.maps.LatLng(point.lat, point.lng);
var gmap = new google.maps.Map(document.getElementById('map_canvas'), {
zoom: 5,
center: myLatLng,
mapTypeId: google.maps.MapTypeId.ROADMAP
});
var myMarker = new google.maps.Marker({
map: gmap,
position: myLatLng,
label: 'Hello World!',
draggable: true
});
}
</script>
<style>
.map-marker-label{
position: absolute;
color: blue;
font-size: 16px;
font-weight: bold;
}
</style>
This will work.
Get battery level and state in Android
Other answers didn't mention how to access battery status (chraging or not).
IntentFilter ifilter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);
Intent batteryStatus = context.registerReceiver(null, ifilter);
// Are we charging / charged?
int status = batteryStatus.getIntExtra(BatteryManager.EXTRA_STATUS, -1);
boolean isCharging = status == BatteryManager.BATTERY_STATUS_CHARGING ||
status == BatteryManager.BATTERY_STATUS_FULL;
// How are we charging?
int chargePlug = batteryStatus.getIntExtra(BatteryManager.EXTRA_PLUGGED, -1);
boolean usbCharge = chargePlug == BatteryManager.BATTERY_PLUGGED_USB;
boolean acCharge = chargePlug == BatteryManager.BATTERY_PLUGGED_AC;
How do I set up a simple delegate to communicate between two view controllers?
Simple example...
Let's say the child view controller has a UISlider
and we want to pass the value of the slider back to the parent via a delegate.
In the child view controller's header file, declare the delegate type and its methods:
ChildViewController.h
#import <UIKit/UIKit.h>
// 1. Forward declaration of ChildViewControllerDelegate - this just declares
// that a ChildViewControllerDelegate type exists so that we can use it
// later.
@protocol ChildViewControllerDelegate;
// 2. Declaration of the view controller class, as usual
@interface ChildViewController : UIViewController
// Delegate properties should always be weak references
// See http://stackoverflow.com/a/4796131/263871 for the rationale
// (Tip: If you're not using ARC, use `assign` instead of `weak`)
@property (nonatomic, weak) id<ChildViewControllerDelegate> delegate;
// A simple IBAction method that I'll associate with a close button in
// the UI. We'll call the delegate's childViewController:didChooseValue:
// method inside this handler.
- (IBAction)handleCloseButton:(id)sender;
@end
// 3. Definition of the delegate's interface
@protocol ChildViewControllerDelegate <NSObject>
- (void)childViewController:(ChildViewController*)viewController
didChooseValue:(CGFloat)value;
@end
In the child view controller's implementation, call the delegate methods as required.
ChildViewController.m
#import "ChildViewController.h"
@implementation ChildViewController
- (void)handleCloseButton:(id)sender {
// Xcode will complain if we access a weak property more than
// once here, since it could in theory be nilled between accesses
// leading to unpredictable results. So we'll start by taking
// a local, strong reference to the delegate.
id<ChildViewControllerDelegate> strongDelegate = self.delegate;
// Our delegate method is optional, so we should
// check that the delegate implements it
if ([strongDelegate respondsToSelector:@selector(childViewController:didChooseValue:)]) {
[strongDelegate childViewController:self didChooseValue:self.slider.value];
}
}
@end
In the parent view controller's header file, declare that it implements the ChildViewControllerDelegate
protocol.
RootViewController.h
#import <UIKit/UIKit.h>
#import "ChildViewController.h"
@interface RootViewController : UITableViewController <ChildViewControllerDelegate>
@end
In the parent view controller's implementation, implement the delegate methods appropriately.
RootViewController.m
#import "RootViewController.h"
@implementation RootViewController
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
ChildViewController *detailViewController = [[ChildViewController alloc] init];
// Assign self as the delegate for the child view controller
detailViewController.delegate = self;
[self.navigationController pushViewController:detailViewController animated:YES];
}
// Implement the delegate methods for ChildViewControllerDelegate
- (void)childViewController:(ChildViewController *)viewController didChooseValue:(CGFloat)value {
// Do something with value...
// ...then dismiss the child view controller
[self.navigationController popViewControllerAnimated:YES];
}
@end
Hope this helps!
javascript Unable to get property 'value' of undefined or null reference
You can't access element like you did (document.frm_new_user_request
). You have to use the function getElementById
:
document.getElementById("frm_new_user_request")
So getting a value from an input could look like this:
var value = document.getElementById("frm_new_user_request").value
Also you can use some JavaScript framework, e.g. jQuery, which simplifies operations with DOM (Document Object Model) and also hides differences between various browsers from you.
Getting a value from an input using jQuery would look like this:
- input with ID "element":
var value = $("#element).value
- input with class "element":
var value = $(".element).value
Reading From A Text File - Batch
Your code "for /f "tokens=* delims=" %%x in (a.txt) do echo %%x" will work on most Windows Operating Systems unless you have modified commands.
So you could instead "cd" into the directory to read from before executing the "for /f" command to follow out the string. For instance if the file "a.txt" is located at C:\documents and settings\%USERNAME%\desktop\a.txt then you'd use the following.
cd "C:\documents and settings\%USERNAME%\desktop"
for /f "tokens=* delims=" %%x in (a.txt) do echo %%x
echo.
echo.
echo.
pause >nul
exit
But since this doesn't work on your computer for x reason there is an easier and more efficient way of doing this. Using the "type" command.
@echo off
color a
cls
cd "C:\documents and settings\%USERNAME%\desktop"
type a.txt
echo.
echo.
pause >nul
exit
Or if you'd like them to select the file from which to write in the batch you could do the following.
@echo off
:A
color a
cls
echo Choose the file that you want to read.
echo.
echo.
tree
echo.
echo.
echo.
set file=
set /p file=File:
cls
echo Reading from %file%
echo.
type %file%
echo.
echo.
echo.
set re=
set /p re=Y/N?:
if %re%==Y goto :A
if %re%==y goto :A
exit
Filename timestamp in Windows CMD batch script getting truncated
The first four lines of this code will give you reliable YY DD MM YYYY HH Min Sec variables in XP Pro and higher, using WMIC.
@echo off
for /f "tokens=2 delims==" %%a in ('wmic OS Get localdatetime /value') do set "dt=%%a"
set "YY=%dt:~2,2%" & set "YYYY=%dt:~0,4%" & set "MM=%dt:~4,2%" & set "DD=%dt:~6,2%"
set "HH=%dt:~8,2%" & set "Min=%dt:~10,2%" & set "Sec=%dt:~12,2%"
set "datestamp=%YYYY%%MM%%DD%" & set "timestamp=%HH%%Min%%Sec%"
set "fullstamp=%YYYY%-%MM%-%DD%_%HH%-%Min%-%Sec%"
echo datestamp: "%datestamp%"
echo timestamp: "%timestamp%"
echo fullstamp: "%fullstamp%"
pause
Output example:
datestamp: "20200828"
timestamp: "085513"
fullstamp: "2020-08-28_08-55-13"
Press any key to continue . . .
Easiest way to detect Internet connection on iOS?
I did a little more research and I am updating my answer with a more current solution. I am not sure if you have already looked at it but there is a nice sample code provided by Apple.
Download the sample code here
Include the Reachability.h and Reachability.m files in your project. Take a look at ReachabilityAppDelegate.m to see an example on how to determine host reachability, reachability by WiFi, by WWAN etc. For a very simply check of network reachability, you can do something like this
Reachability *networkReachability = [Reachability reachabilityForInternetConnection];
NetworkStatus networkStatus = [networkReachability currentReachabilityStatus];
if (networkStatus == NotReachable) {
NSLog(@"There IS NO internet connection");
} else {
NSLog(@"There IS internet connection");
}
@BenjaminPiette's: Don't forget to add SystemConfiguration.framework to your project.
Could not open ServletContext resource
Do not use classpath. This may cause problems with different ClassLoaders (container vs. application). WEB-INF is always the better choice.
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/spring-config.xml</param-value>
</context-param>
and
<bean id="placeholderConfig" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="location">
<value>/WEB-INF/social.properties</value>
</property>
</bean>
Shell script : How to cut part of a string
I pasted the contents of your example into a file named so.txt
.
$ cat so.txt | awk '{ print $7 }' | cut -f2 -d"="
9
10
Explanation:
cat so.txt
will print the contents of the file to stdout
.
awk '{ print $7 }'
will print the seventh column, i.e. the one containing id=n
cut -f2 -d"="
will cut the output of step #2 using =
as the delimiter and get the second column (-f2
)
If you'd rather get id=
also, then:
$ cat so.txt | awk '{ print $7 }'
id=9
id=10
Add button to navigationbar programmatically
Try this.It work for me.
Add button to navigation bar programmatically, Also we set image to navigation bar button,
Below is Code:-
UIBarButtonItem *Savebtn=[[UIBarButtonItem alloc]initWithImage:
[[UIImage imageNamed:@"bt_save.png"]imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal]
style:UIBarButtonItemStylePlain target:self action:@selector(SaveButtonClicked)];
self.navigationItem.rightBarButtonItem=Savebtn;
-(void)SaveButtonClicked
{
// Add save button code.
}
Convert an integer to a byte array
Adding this option for dealing with basic uint8 to byte[] conversion
foo := 255 // 1 - 255
ufoo := uint16(foo)
far := []byte{0,0}
binary.LittleEndian.PutUint16(far, ufoo)
bar := int(far[0]) // back to int
fmt.Println("foo, far, bar : ",foo,far,bar)
output :
foo, far, bar : 255 [255 0] 255
Notification Icon with the new Firebase Cloud Messaging system
There is also one ugly but working way. Decompile FirebaseMessagingService.class and modify it's behavior. Then just put the class to the right package in yout app and dex use it instead of the class in the messaging lib itself. It is quite easy and working.
There is method:
private void zzo(Intent intent) {
Bundle bundle = intent.getExtras();
bundle.remove("android.support.content.wakelockid");
if (zza.zzac(bundle)) { // true if msg is notification sent from FirebaseConsole
if (!zza.zzdc((Context)this)) { // true if app is on foreground
zza.zzer((Context)this).zzas(bundle); // create notification
return;
}
// parse notification data to allow use it in onMessageReceived whe app is on foreground
if (FirebaseMessagingService.zzav(bundle)) {
zzb.zzo((Context)this, intent);
}
}
this.onMessageReceived(new RemoteMessage(bundle));
}
This code is from version 9.4.0, method will have different names in different version because of obfuscation.
How to do SELECT MAX in Django?
Django also has the 'latest(field_name = None)' function that finds the latest (max. value) entry. It not only works with date fields but also with strings and integers.
You can give the field name when calling that function:
max_rated_entry = YourModel.objects.latest('rating')
return max_rated_entry.details
Or you can already give that field name in your models meta data:
from django.db import models
class YourModel(models.Model):
#your class definition
class Meta:
get_latest_by = 'rating'
Now you can call 'latest()' without any parameters:
max_rated_entry = YourModel.objects.latest()
return max_rated_entry.details
What happens when a duplicate key is put into a HashMap?
Maps from JDK are not meant for storing data under duplicated keys.
No duplicates:
Stream.of("one").collect(Collectors.toMap(x -> x, x -> x))
Ok. You will get: $2 ==> {one=one}
Duplicated stream:
Stream.of("one", "not one", "surely not one").collect(Collectors.toMap(x -> 1, x -> x))
Exception java.lang.IllegalStateException: Duplicate key 1 (attempted merging values one and not one)
| at Collectors.duplicateKeyException (Collectors.java:133)
| at Collectors.lambda$uniqKeysMapAccumulator$1 (Collectors.java:180)
| at ReduceOps$3ReducingSink.accept (ReduceOps.java:169)
| at Spliterators$ArraySpliterator.forEachRemaining (Spliterators.java:948)
| at AbstractPipeline.copyInto (AbstractPipeline.java:484)
| at AbstractPipeline.wrapAndCopyInto (AbstractPipeline.java:474)
| at ReduceOps$ReduceOp.evaluateSequential (ReduceOps.java:913)
| at AbstractPipeline.evaluate (AbstractPipeline.java:234)
| at ReferencePipeline.collect (ReferencePipeline.java:578)
| at (#4:1)
To deal with duplicated keys - use other package, e.g:
https://google.github.io/guava/releases/19.0/api/docs/com/google/common/collect/Multimap.html
There is a lot of other implementations dealing with duplicated keys.
Those are needed for web (e.g. duplicated cookie keys, Http headers can have same fields, ...)
Good luck! :)
Get the records of last month in SQL server
If you are looking for last month so try this,
SELECT
FROM #emp
WHERE DATEDIFF(MONTH,CREATEDDATE,GETDATE()) = 1
If you are looking for last month so try this,
SELECT
FROM #emp
WHERE DATEDIFF(day,CREATEDDATE,GETDATE()) between 1 and 30
Remove a folder from git tracking
From the git documentation:
Another useful thing you may want to do is to keep the file in your working tree but remove it from your staging area. In other words, you may want to keep the file on your hard drive but not have Git track it anymore. This is particularly useful if you forgot to add something to your .gitignore file and accidentally staged it, like a large log file or a bunch of .a compiled files. To do this, use the --cached option:
$ git rm --cached readme.txt
So maybe don't include the "-r"?
Set a default font for whole iOS app?
None of these solutions works universally throughout the app. One thing I found to help manage the fonts in Xcode is opening the Storyboard as Source code (Control-click storyboard in Files navigator > "Open as" > "Source"), and then doing a find-and-replace.
var.replace is not a function
You are not passing a string otherwise it would have a replace
method. I hope you didnt type function trim(str) { return var.replace(blah); }
instead of return str.replace
.
How to check a string for specific characters?
Quick comparison of timings in response to the post by Abbafei:
import timeit
def func1():
phrase = 'Lucky Dog'
return any(i in 'LD' for i in phrase)
def func2():
phrase = 'Lucky Dog'
if ('L' in phrase) or ('D' in phrase):
return True
else:
return False
if __name__ == '__main__':
func1_time = timeit.timeit(func1, number=100000)
func2_time = timeit.timeit(func2, number=100000)
print('Func1 Time: {0}\nFunc2 Time: {1}'.format(func1_time, func2_time))
Output:
Func1 Time: 0.0737484362111
Func2 Time: 0.0125144964371
So the code is more compact with any, but faster with the conditional.
EDIT : TL;DR -- For long strings, if-then is still much faster than any!
I decided to compare the timing for a long random string based on some of the valid points raised in the comments:
# Tested in Python 2.7.14
import timeit
from string import ascii_letters
from random import choice
def create_random_string(length=1000):
random_list = [choice(ascii_letters) for x in range(length)]
return ''.join(random_list)
def function_using_any(phrase):
return any(i in 'LD' for i in phrase)
def function_using_if_then(phrase):
if ('L' in phrase) or ('D' in phrase):
return True
else:
return False
if __name__ == '__main__':
random_string = create_random_string(length=2000)
func1_time = timeit.timeit(stmt="function_using_any(random_string)",
setup="from __main__ import function_using_any, random_string",
number=200000)
func2_time = timeit.timeit(stmt="function_using_if_then(random_string)",
setup="from __main__ import function_using_if_then, random_string",
number=200000)
print('Time for function using any: {0}\nTime for function using if-then: {1}'.format(func1_time, func2_time))
Output:
Time for function using any: 0.1342546
Time for function using if-then: 0.0201827
If-then is almost an order of magnitude faster than any!
How do you perform wireless debugging in Xcode 9 with iOS 11, Apple TV 4K, etc?
My problem was about network SSID broadcasting.
I've tried all the solutions above but still couldn't connect my device, there was no 'globe' icon for my device at all. Then I found that for some reason my network had turned its SSID broadcasting off(tho I could still connect the network by inputing the SSID manually). Once I turned the SSID broadcasting on, I could connect my device via 'Connect via IP Address...'.
How to determine the screen width in terms of dp or dip at runtime in Android?
Get Screen Width and Height in terms of DP with some good decoration:
Step 1: Create interface
public interface ScreenInterface {
float getWidth();
float getHeight();
}
Step 2: Create implementer class
public class Screen implements ScreenInterface {
private Activity activity;
public Screen(Activity activity) {
this.activity = activity;
}
private DisplayMetrics getScreenDimension(Activity activity) {
DisplayMetrics displayMetrics = new DisplayMetrics();
activity.getWindowManager().getDefaultDisplay().getMetrics(displayMetrics);
return displayMetrics;
}
private float getScreenDensity(Activity activity) {
return activity.getResources().getDisplayMetrics().density;
}
@Override
public float getWidth() {
DisplayMetrics displayMetrics = getScreenDimension(activity);
return displayMetrics.widthPixels / getScreenDensity(activity);
}
@Override
public float getHeight() {
DisplayMetrics displayMetrics = getScreenDimension(activity);
return displayMetrics.heightPixels / getScreenDensity(activity);
}
}
Step 3: Get width and height in activity:
Screen screen = new Screen(this); // Setting Screen
screen.getWidth();
screen.getHeight();
How to get element by innerText
I think you'll need to be a bit more specific for us to help you.
- How are you finding this? Javascript? PHP? Perl?
- Can you apply an ID attribute to the tag?
If the text is unique (or really, if it's not, but you'd have to run through an array) you could run a regular expression to find it. Using PHP's preg_match() would work for that.
If you're using Javascript and can insert an ID attribute, then you can use getElementById('id'). You can then access the returned element's attributes through the DOM: https://developer.mozilla.org/en/DOM/element.1.
Simple UDP example to send and receive data from same socket
I'll try to keep this short, I've done this a few months ago for a game I was trying to build, it does a UDP "Client-Server" connection that acts like TCP, you can send (message) (message + object) using this. I've done some testing with it and it works just fine, feel free to modify it if needed.
Getting URL parameter in java and extract a specific text from that URL
Import these libraries
import org.apache.http.NameValuePair;
import org.apache.http.message.BasicNameValuePair;
Similar to the verisimilitude, but with the capabilities of handling multivalue parameters. Note: I've seen HTTP GET requests without a value, in this case the value will be null.
public static List<NameValuePair> getQueryMap(String query)
{
List<NameValuePair> queryMap = new ArrayList<NameValuePair>();
String[] params = query.split(Pattern.quote("&"));
for (String param : params)
{
String[] chunks = param.split(Pattern.quote("="));
String name = chunks[0], value = null;
if(chunks.length > 1) {
value = chunks[1];
}
queryMap.add(new BasicNameValuePair(name, value));
}
return queryMap;
}
Example:
GET /bottom.gif?e235c08=1509896923&%49%6E%...
AngularJS : Factory and Service?
Service vs Factory
The difference between factory and service is just like the difference between a function and an object
Factory Provider
Gives us the function's return value ie. You just create an object, add properties to it, then return that same object.When you pass this service into your controller, those properties on the object will now be available in that controller through your factory. (Hypothetical Scenario)
Singleton and will only be created once
Reusable components
Factory are a great way for communicating between controllers like sharing data.
Can use other dependencies
Usually used when the service instance requires complex creation logic
Cannot be injected in .config()
function.
Used for non configurable services
If you're using an object, you could use the factory provider.
Syntax: module.factory('factoryName', function);
Service Provider
Gives us the instance of a function (object)- You just instantiated with the ‘new’ keyword and you’ll add properties to ‘this’ and the service will return ‘this’.When you pass the service into your controller, those properties on ‘this’ will now be available on that controller through your service. (Hypothetical Scenario)
Singleton and will only be created once
Reusable components
Services are used for communication between controllers to share data
You can add properties and functions to a service object by using the this
keyword
Dependencies are injected as constructor arguments
Used for simple creation logic
Cannot be injected in .config()
function.
If you're using a class you could use the service provider
Syntax: module.service(‘serviceName’, function);
Sample Demo
In below example I have define MyService
and MyFactory
. Note how in .service
I have created the service methods using this.methodname.
In .factory
I have created a factory object and assigned the methods to it.
AngularJS .service
module.service('MyService', function() {
this.method1 = function() {
//..method1 logic
}
this.method2 = function() {
//..method2 logic
}
});
AngularJS .factory
module.factory('MyFactory', function() {
var factory = {};
factory.method1 = function() {
//..method1 logic
}
factory.method2 = function() {
//..method2 logic
}
return factory;
});
Also Take a look at this beautiful stuffs
Confused about service vs factory
AngularJS Factory, Service and Provider
Angular.js: service vs provider vs factory?
how to get request path with express req object
In some cases you should use:
req.path
This gives you the path, instead of the complete requested URL. For example, if you are only interested in which page the user requested and not all kinds of parameters the url:
/myurl.htm?allkinds&ofparameters=true
req.path will give you:
/myurl.html
Read response headers from API response - Angular 5 + TypeScript
Have you exposed the X-Token
from server side using access-control-expose-headers
? because not all headers are allowed to be accessed from the client side, you need to expose them from the server side
Also in your frontend, you can use new HTTP module to get a full response using {observe: 'response'}
like
http
.get<any>('url', {observe: 'response'})
.subscribe(resp => {
console.log(resp.headers.get('X-Token'));
});
NameError: uninitialized constant (rails)
If none of the above work, I also have a different approach, as it happened to me in a real scenario.
More specifically using auto-generated Ruby files from Thrift.
In my situation, I had a Module
with several classes, so the order is important in this case:
Class A
makes use of Class B
in the same module. However, Class B
was declared after Class A
.
Simply making Class B
to be declared before Class A
solved the issue to me.
Generating HTML email body in C#
Use the System.Web.UI.HtmlTextWriter class.
StringWriter writer = new StringWriter();
HtmlTextWriter html = new HtmlTextWriter(writer);
html.RenderBeginTag(HtmlTextWriterTag.H1);
html.WriteEncodedText("Heading Here");
html.RenderEndTag();
html.WriteEncodedText(String.Format("Dear {0}", userName));
html.WriteBreak();
html.RenderBeginTag(HtmlTextWriterTag.P);
html.WriteEncodedText("First part of the email body goes here");
html.RenderEndTag();
html.Flush();
string htmlString = writer.ToString();
For extensive HTML that includes the creation of style attributes HtmlTextWriter is probably the best way to go. However it can be a bit clunky to use and some developers like the markup itself to be easily read but perversly HtmlTextWriter's choices with regard indentation is a bit wierd.
In this example you can also use XmlTextWriter quite effectively:-
writer = new StringWriter();
XmlTextWriter xml = new XmlTextWriter(writer);
xml.Formatting = Formatting.Indented;
xml.WriteElementString("h1", "Heading Here");
xml.WriteString(String.Format("Dear {0}", userName));
xml.WriteStartElement("br");
xml.WriteEndElement();
xml.WriteElementString("p", "First part of the email body goes here");
xml.Flush();
Change type of varchar field to integer: "cannot be cast automatically to type integer"
Try this, it will work for sure.
When writing Rails migrations to convert a string column to an integer you'd usually say:
change_column :table_name, :column_name, :integer
However, PostgreSQL will complain:
PG::DatatypeMismatch: ERROR: column "column_name" cannot be cast automatically to type integer
HINT: Specify a USING expression to perform the conversion.
The "hint" basically tells you that you need to confirm you want this to happen, and how data shall be converted. Just say this in your migration:
change_column :table_name, :column_name, 'integer USING CAST(column_name AS integer)'
The above will mimic what you know from other database adapters. If you have non-numeric data, results may be unexpected (but you're converting to an integer, after all).
Printing Batch file results to a text file
For showing result of batch file in text file, you can use
this command
chdir > test.txt
This command will redirect result to test.txt.
When you open test.txt you will found current path of directory in test.txt
async for loop in node.js
I like to use the recursive pattern for this scenario. For example, something like this:
// If config is an array of queries
var config = JSON.parse(queries.querrryArray);
// Array of results
var results;
processQueries(config);
function processQueries(queries) {
var searchQuery;
if (queries.length == 0) {
// All queries complete
res.writeHead(200, {'content-type': 'application/json'});
res.end(JSON.stringify({results: results}));
return;
}
searchQuery = queries.pop();
search(searchQuery, function(result) {
results.push(JSON.stringify({result: result});
processQueries();
});
}
processQueries
is a recursive function that will pull a query element out of an array of queries to process. Then the callback function calls processQueries
again when the query is complete. The processQueries
knows to end when there are no queries left.
It is easiest to do this using arrays, but it could be modified to work with object key/values I imagine.
How to get relative path from absolute path
public static string ToRelativePath(string filePath, string refPath)
{
var pathNormalized = Path.GetFullPath(filePath);
var refNormalized = Path.GetFullPath(refPath);
refNormalized = refNormalized.TrimEnd('\\', '/');
if (!pathNormalized.StartsWith(refNormalized))
throw new ArgumentException();
var res = pathNormalized.Substring(refNormalized.Length + 1);
return res;
}
What is stdClass in PHP?
You can also use object
to cast arrays to an object of your choice:
Class Example
{
public $name;
public $age;
}
Now to create an object of type Example
and to initialize it you can do either of these:
$example = new Example();
$example->name = "some name";
$example->age = 22;
OR
$example = new Example();
$example = (object) ['name' => "some name", 'age' => 22];
The second method is mostly useful for initializing objects with many properties.
NSURLSession/NSURLConnection HTTP load failed on iOS 9
If you're having this problem with Amazon S3 as me, try to paste this on your info.plist as a direct child of your top level tag
<key>NSAppTransportSecurity</key>
<dict>
<key>NSExceptionDomains</key>
<dict>
<key>amazonaws.com</key>
<dict>
<key>NSThirdPartyExceptionMinimumTLSVersion</key>
<string>TLSv1.0</string>
<key>NSThirdPartyExceptionRequiresForwardSecrecy</key>
<false/>
<key>NSIncludesSubdomains</key>
<true/>
</dict>
<key>amazonaws.com.cn</key>
<dict>
<key>NSThirdPartyExceptionMinimumTLSVersion</key>
<string>TLSv1.0</string>
<key>NSThirdPartyExceptionRequiresForwardSecrecy</key>
<false/>
<key>NSIncludesSubdomains</key>
<true/>
</dict>
</dict>
</dict>
You can find more info at:
http://docs.aws.amazon.com/mobile/sdkforios/developerguide/ats.html#resolving-the-issue
Submit form using a button outside the <form> tag
A solution that works great for me, is still missing here. It requires having a visually hidden <submit>
or <input type="submit">
element whithin the <form>
, and an associated <label>
element outside of it. It would look like this:
<form method="get" action="something.php">
<input type="text" name="name" />
<input type="submit" id="submit-form" class="hidden" />
</form>
<label for="submit-form" tabindex="0">Submit</label>
Now this link enables you to 'click' the form <submit>
element by clicking the <label>
element.
Pad a number with leading zeros in JavaScript
function padToFour(number) {
if (number<=9999) { number = ("000"+number).slice(-4); }
return number;
}
Something like that?
Bonus incomprehensible-but-slicker single-line ES6 version:
let padToFour = number => number <= 9999 ? `000${number}`.slice(-4) : number;
ES6isms:
let
is a block scoped variable (as opposed to var
’s functional scoping)
=>
is an arrow function that among other things replaces function
and is prepended by its parameters
- If a arrow function takes a single parameter you can omit the parentheses (hence
number =>
)
- If an arrow function body has a single line that starts with
return
you can omit the braces and the return
keyword and simply use the expression
- To get the function body down to a single line I cheated and used a ternary expression
delete image from folder PHP
There are a few routes. One, the most simple, would involve making that into a form; when it submits you react to POST data and delete the image using unlink
DISCLAIMER: This is not secure. An attacker could use this code to delete any file on your server. You must expand on this demonstration code to add some measure of security, otherwise you can expect bad things.
Each image's display markup would contain a form something like this:
echo '<form method="post">';
echo '<input type="hidden" value="'.$file.'" name="delete_file" />';
echo '<input type="submit" value="Delete image" />';
echo '</form>';
...and at at the top of that same PHP file:
if (array_key_exists('delete_file', $_POST)) {
$filename = $_POST['delete_file'];
if (file_exists($filename)) {
unlink($filename);
echo 'File '.$filename.' has been deleted';
} else {
echo 'Could not delete '.$filename.', file does not exist';
}
}
// existing code continues below...
You can elaborate on this by using javascript: instead of submitting the form, you could send an AJAX request. The server-side code would look rather similar to this.
Documentation and Related Reading
How do implement a breadth first traversal?
Use the following algorithm to traverse in breadth first search-
- First add the root node into the queue with the put method.
- Iterate while the queue is not empty.
- Get the first node in the queue, and then print its value.
- Add both left and right children into the queue (if the current
nodehas children).
- Done. We will print the value of each node, level by level,by
poping/removing the element
Code is written below-
Queue<TreeNode> queue= new LinkedList<>();
private void breadthWiseTraversal(TreeNode root) {
if(root==null){
return;
}
TreeNode temp = root;
queue.clear();
((LinkedList<TreeNode>) queue).add(temp);
while(!queue.isEmpty()){
TreeNode ref= queue.remove();
System.out.print(ref.data+" ");
if(ref.left!=null) {
((LinkedList<TreeNode>) queue).add(ref.left);
}
if(ref.right!=null) {
((LinkedList<TreeNode>) queue).add(ref.right);
}
}
}
POST request with JSON body
I think cURL would be a good solution. This is not tested, but you can try something like this:
$body = '{
"kind": "blogger#post",
"blog": {
"id": "8070105920543249955"
},
"title": "A new post",
"content": "With <b>exciting</b> content..."
}';
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, "https://www.googleapis.com/blogger/v3/blogs/8070105920543249955/posts/");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_HTTPHEADER, array("Content-Type: application/json","Authorization: OAuth 2.0 token here"));
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $body);
$result = curl_exec($ch);
How to execute a command prompt command from python
Why do you want to call cmd.exe
? cmd.exe
is a command line (shell). If you want to change directory, use os.chdir("C:\\")
. Try not to call external commands if Python can provide it. In fact, most operating system commands are provide through the os
module (and sys). I suggest you take a look at os
module documentation to see the various methods available.
Rename Excel Sheet with VBA Macro
The "no frills" options are as follows:
ActiveSheet.Name = "New Name"
and
Sheets("Sheet2").Name = "New Name"
You can also check out recording macros and seeing what code it gives you, it's a great way to start learning some of the more vanilla functions.
How to display activity indicator in middle of the iphone screen?
Hope this will work:
// create activity indicator
UIActivityIndicatorView *activityIndicator = [[UIActivityIndicatorView alloc]
initWithFrame:CGRectMake(0.0f, 0.0f, 20.0f, 20.0f)];
[activityIndicator setActivityIndicatorViewStyle:UIActivityIndicatorViewStyleWhite];
...
[self.view addSubview:activityIndicator];
// release it
[activityIndicator release];
Force flex item to span full row width
When you want a flex item to occupy an entire row, set it to width: 100%
or flex-basis: 100%
, and enable wrap
on the container.
The item now consumes all available space. Siblings are forced on to other rows.
_x000D_
_x000D_
.parent {
display: flex;
flex-wrap: wrap;
}
#range, #text {
flex: 1;
}
.error {
flex: 0 0 100%; /* flex-grow, flex-shrink, flex-basis */
border: 1px dashed black;
}
_x000D_
<div class="parent">
<input type="range" id="range">
<input type="text" id="text">
<label class="error">Error message (takes full width)</label>
</div>
_x000D_
_x000D_
_x000D_
More info: The initial value of the flex-wrap
property is nowrap
, which means that all items will line up in a row. MDN
Regex for Comma delimited list
This regex extracts an element from a comma separated list, regardless of contents:
(.+?)(?:,|$)
If you just replace the comma with something else, it should work for any delimiter.
What is a PDB file?
Program Debug Database file (pdb) is a file format by Microsoft for storing debugging information.
When you build a project using Visual Studio or command prompt the compiler creates these symbol files.
Check Microsoft Docs
Anaconda vs. miniconda
Brief
conda
is both a command line tool, and a python package.
Miniconda installer = Python + conda
Anaconda installer = Python + conda
+ meta package anaconda
meta Python pkg anaconda
= about 160 Python pkgs for daily use in data science
Anaconda installer = Miniconda installer + conda install anaconda
Detail
conda
is a python manager and an environment manager, which makes it possible to
- install package with
conda install flake8
- create an environment with any version of Python with
conda create -n myenv python=3.6
Miniconda installer = Python + conda
conda
, the package manager and environment manager, is a Python package. So Python is installed. Cause conda distribute Python interpreter with its own libraries/dependencies but not the existing ones on your operating system, other minimal dependencies like openssl
, ncurses
, sqlite
, etc are installed as well.
Basically, Miniconda is just conda
and its minimal dependencies. And the environment where conda
is installed is the "base" environment, which is previously called "root" environment.
Anaconda installer = Python + conda
+ meta package anaconda
meta Python package anaconda
= about 160 Python pkgs for daily use in data science
Meta packages, are packages that do NOT contain actual softwares and simply depend on other packages to be installed.
Download an anaconda
meta package from Anaconda Cloud and extract the content from it. The actual 160+ packages to be installed are listed in info/recipe/meta.yaml
.
package:
name: anaconda
version: '2019.07'
build:
ignore_run_exports:
- '*'
number: '0'
pin_depends: strict
string: py36_0
requirements:
build:
- python 3.6.8 haf84260_0
is_meta_pkg:
- true
run:
- alabaster 0.7.12 py36_0
- anaconda-client 1.7.2 py36_0
- anaconda-project 0.8.3 py_0
# ...
- beautifulsoup4 4.7.1 py36_1
# ...
- curl 7.65.2 ha441bb4_0
# ...
- hdf5 1.10.4 hfa1e0ec_0
# ...
- ipykernel 5.1.1 py36h39e3cac_0
- ipython 7.6.1 py36h39e3cac_0
- ipython_genutils 0.2.0 py36h241746c_0
- ipywidgets 7.5.0 py_0
# ...
- jupyter 1.0.0 py36_7
- jupyter_client 5.3.1 py_0
- jupyter_console 6.0.0 py36_0
- jupyter_core 4.5.0 py_0
- jupyterlab 1.0.2 py36hf63ae98_0
- jupyterlab_server 1.0.0 py_0
# ...
- matplotlib 3.1.0 py36h54f8f79_0
# ...
- mkl 2019.4 233
- mkl-service 2.0.2 py36h1de35cc_0
- mkl_fft 1.0.12 py36h5e564d8_0
- mkl_random 1.0.2 py36h27c97d8_0
# ...
- nltk 3.4.4 py36_0
# ...
- numpy 1.16.4 py36hacdab7b_0
- numpy-base 1.16.4 py36h6575580_0
- numpydoc 0.9.1 py_0
# ...
- pandas 0.24.2 py36h0a44026_0
- pandoc 2.2.3.2 0
# ...
- pillow 6.1.0 py36hb68e598_0
# ...
- pyqt 5.9.2 py36h655552a_2
# ...
- qt 5.9.7 h468cd18_1
- qtawesome 0.5.7 py36_1
- qtconsole 4.5.1 py_0
- qtpy 1.8.0 py_0
# ...
- requests 2.22.0 py36_0
# ...
- sphinx 2.1.2 py_0
- sphinxcontrib 1.0 py36_1
- sphinxcontrib-applehelp 1.0.1 py_0
- sphinxcontrib-devhelp 1.0.1 py_0
- sphinxcontrib-htmlhelp 1.0.2 py_0
- sphinxcontrib-jsmath 1.0.1 py_0
- sphinxcontrib-qthelp 1.0.2 py_0
- sphinxcontrib-serializinghtml 1.1.3 py_0
- sphinxcontrib-websupport 1.1.2 py_0
- spyder 3.3.6 py36_0
- spyder-kernels 0.5.1 py36_0
# ...
The pre-installed packages from meta pkg anaconda
are mainly for web scraping and data science. Like requests
, beautifulsoup
, numpy
, nltk
, etc.
If you have a Miniconda installed, conda install anaconda
will make it same as an Anaconda installation, except that the installation folder names are different.
Miniconda2 v.s. Miniconda. Anaconda2 v.s. Anaconda.
2
means the bundled Python interpreter for conda
in the "base" environment is Python 2, but not Python 3.
#1045 - Access denied for user 'root'@'localhost' (using password: YES)
Go to config.inc.php
, find $cfg['Servers'][$i]['password']
and remove any password provided, i.e change $cfg['Servers'][$i]['password'] = 'password';
with $cfg['Servers'][$i]['password'] = '';
Now you can launch phpMyAdmin
Selecting Users menu from phpMyAdmin, select the root user and click Edit previlidges.
Now scroll down to Change Password area, switch between No Password and Password to provide your new password.
that's it.
ps1 cannot be loaded because running scripts is disabled on this system
If you are using visual studio code:
- Open terminal
- Run the command: Set-ExecutionPolicy -Scope CurrentUser -ExecutionPolicy Unrestricted
- Then run the command protractor conf.js
This is related to protractor test script execution related and I faced the same issue and it was resolved like this.
Spring JDBC Template for calling Stored Procedures
There are a number of ways to call stored procedures in Spring.
If you use CallableStatementCreator
to declare parameters, you will be using Java's standard interface of CallableStatement
, i.e register out parameters and set them separately. Using SqlParameter
abstraction will make your code cleaner.
I recommend you looking at SimpleJdbcCall
. It may be used like this:
SimpleJdbcCall jdbcCall = new SimpleJdbcCall(jdbcTemplate)
.withSchemaName(schema)
.withCatalogName(package)
.withProcedureName(procedure)();
...
jdbcCall.addDeclaredParameter(new SqlParameter(paramName, OracleTypes.NUMBER));
...
jdbcCall.execute(callParams);
For simple procedures you may use jdbcTemplate
's update
method:
jdbcTemplate.update("call SOME_PROC (?, ?)", param1, param2);
Hidden Features of Java
I think another "overlooked" feature of java is the JVM itself. It is probably the best VM available. And it supports lots of interesting and useful languages (Jython, JRuby, Scala, Groovy). All those languages can easily and seamlessly cooperate.
If you design a new language (like in the scala-case) you immediately have all the existing libraries available and your language is therefore "useful" from the very beginning.
All those languages make use of the HotSpot optimizations. The VM is very well monitor and debuggable.
JSON, REST, SOAP, WSDL, and SOA: How do they all link together
WSDL: Stands for Web Service Description Language
In SOAP(simple object access protocol), when you use web service and add a web service to your project, your client application(s) doesn't know about web service Functions. Nowadays it's somehow old-fashion and for each kind of different client you have to implement different WSDL
files. For example you cannot use same file for .Net
and php
client.
The WSDL
file has some descriptions about web service functions. The type of this file is XML
. SOAP
is an alternative for REST
.
REST: Stands for Representational State Transfer
It is another kind of API service, it is really easy to use for clients. They do not need to have special file extension like WSDL
files. The CRUD operation can be implemented by different HTTP Verbs
(GET for Reading, POST for Creation, PUT or PATCH for Updating and DELETE for Deleting the desired document) , They are based on HTTP
protocol and most of times the response is in JSON
or XML
format. On the other hand the client application have to exactly call the related HTTP Verb
via exact parameters names and types. Due to not having special file for definition, like WSDL
, it is a manually job using the endpoint. But it is not a big deal because now we have a lot of plugins for different IDEs to generating the client-side implementation.
SOA: Stands for Service Oriented Architecture
Includes all of the programming with web services concepts and architecture. Imagine that you want to implement a large-scale application. One practice can be having some different services, called micro-services and the whole application mechanism would be calling needed web service at the right time.
Both REST
and SOAP
web services are kind of SOA
.
JSON: Stands for javascript Object Notation
when you serialize an object for javascript the type of object format is JSON.
imagine that you have the human class :
class Human{
string Name;
string Family;
int Age;
}
and you have some instances from this class :
Human h1 = new Human(){
Name='Saman',
Family='Gholami',
Age=26
}
when you serialize the h1 object to JSON the result is :
[h1:{Name:'saman',Family:'Gholami',Age:'26'}, ...]
javascript
can evaluate this format by eval()
function and make an associative array from this JSON
string. This one is different concept in comparison to other concepts I described formerly.
Can you use a trailing comma in a JSON object?
According to the Class JSONArray specification:
- An extra , (comma) may appear just before the closing bracket.
- The null value will be inserted when there is , (comma) elision.
So, as I understand it, it should be allowed to write:
[0,1,2,3,4,5,]
But it could happen that some parsers will return the 7 as item count (like IE8 as Daniel Earwicker pointed out) instead of the expected 6.
Edited:
I found this JSON Validator that validates a JSON string against RFC 4627 (The application/json media type for JavaScript Object Notation) and against the JavaScript language specification. Actually here an array with a trailing comma is considered valid just for JavaScript and not for the RFC 4627 specification.
However, in the RFC 4627 specification is stated that:
2.3. Arrays
An array structure is represented as square brackets surrounding zero
or more values (or elements). Elements are separated by commas.
array = begin-array [ value *( value-separator value ) ] end-array
To me this is again an interpretation problem. If you write that Elements are separated by commas (without stating something about special cases, like the last element), it could be understood in both ways.
P.S. RFC 4627 isn't a standard (as explicitly stated), and is already obsolited by RFC 7159 (which is a proposed standard) RFC 7159
Refreshing page on click of a button
<button type="button" onClick="refreshPage()">Close</button>
<script>
function refreshPage(){
window.location.reload();
}
</script>
or
<button type="button" onClick="window.location.reload();">Close</button>
How to extract a value from a string using regex and a shell?
Yes regex can certainly be used to extract part of a string. Unfortunately different flavours of *nix and different tools use slightly different Regex variants.
This sed command should work on most flavours (Tested on OS/X and Redhat)
echo '12 BBQ ,45 rofl, 89 lol' | sed 's/^.*,\([0-9][0-9]*\).*$/\1/g'
In Java, how do you determine if a thread is running?
You can use this method:
boolean isAlive()
It returns true if the thread is still alive and false if the Thread is dead.
This is not static. You need a reference to the object of the Thread class.
One more tip:
If you're checking it's status to make the main thread wait while the new thread is still running, you may use join() method. It is more handy.
git clone through ssh
Disclaimer: This is just a copy of a comment by bobbaluba made more visible for future visitors. It helped me more than any other answer.
You have to drop the ssh://
prefix when using git clone
as an example
git clone [email protected]:owner/repo.git
Google Maps: how to get country, state/province/region, city given a lat/long value?
I wrote this function that extracts what you are looking for based on the address_components
returned from the gmaps API. This is the city (for example).
export const getAddressCity = (address, length) => {
const findType = type => type.types[0] === "locality"
const location = address.map(obj => obj)
const rr = location.filter(findType)[0]
return (
length === 'short'
? rr.short_name
: rr.long_name
)
}
Change locality
to administrative_area_level_1
for the State etc.
In my js code I am using like so:
const location =`${getAddressCity(address_components, 'short')}, ${getAddressState(address_components, 'short')}`
Will return: Waltham, MA
Can I display the value of an enum with printf()?
The correct answer to this has already been given: no, you can't give the name of an enum, only it's value.
Nevertheless, just for fun, this will give you an enum and a lookup-table all in one and give you a means of printing it by name:
main.c:
#include "Enum.h"
CreateEnum(
EnumerationName,
ENUMValue1,
ENUMValue2,
ENUMValue3);
int main(void)
{
int i;
EnumerationName EnumInstance = ENUMValue1;
/* Prints "ENUMValue1" */
PrintEnumValue(EnumerationName, EnumInstance);
/* Prints:
* ENUMValue1
* ENUMValue2
* ENUMValue3
*/
for (i=0;i<3;i++)
{
PrintEnumValue(EnumerationName, i);
}
return 0;
}
Enum.h:
#include <stdio.h>
#include <string.h>
#ifdef NDEBUG
#define CreateEnum(name,...) \
typedef enum \
{ \
__VA_ARGS__ \
} name;
#define PrintEnumValue(name,value)
#else
#define CreateEnum(name,...) \
typedef enum \
{ \
__VA_ARGS__ \
} name; \
const char Lookup##name[] = \
#__VA_ARGS__;
#define PrintEnumValue(name, value) print_enum_value(Lookup##name, value)
void print_enum_value(const char *lookup, int value);
#endif
Enum.c
#include "Enum.h"
#ifndef NDEBUG
void print_enum_value(const char *lookup, int value)
{
char *lookup_copy;
int lookup_length;
char *pch;
lookup_length = strlen(lookup);
lookup_copy = malloc((1+lookup_length)*sizeof(char));
strcpy(lookup_copy, lookup);
pch = strtok(lookup_copy," ,");
while (pch != NULL)
{
if (value == 0)
{
printf("%s\n",pch);
break;
}
else
{
pch = strtok(NULL, " ,.-");
value--;
}
}
free(lookup_copy);
}
#endif
Disclaimer: don't do this.
Background image jumps when address bar hides iOS/Android/Mobile Chrome
This issue is caused by the URL bars shrinking/sliding out of the way and changing the size of the #bg1 and #bg2 divs since they are 100% height and "fixed". Since the background image is set to "cover" it will adjust the image size/position as the containing area is larger.
Based on the responsive nature of the site, the background must scale. I entertain two possible solutions:
1) Set the #bg1, #bg2 height to 100vh. In theory, this an elegant solution. However, iOS has a vh bug (http://thatemil.com/blog/2013/06/13/viewport-relative-unit-strangeness-in-ios-6/). I attempted using a max-height to prevent the issue, but it remained.
2) The viewport size, when determined by Javascript, is not affected by the URL bar. Therefore, Javascript can be used to set a static height on the #bg1 and #bg2 based on the viewport size. This is not the best solution as it isn't pure CSS and there is a slight image jump on page load. However, it is the only viable solution I see considering iOS's "vh" bugs (which do not appear to be fixed in iOS 7).
var bg = $("#bg1, #bg2");
function resizeBackground() {
bg.height($(window).height());
}
$(window).resize(resizeBackground);
resizeBackground();
On a side note, I've seen so many issues with these resizing URL bars in iOS and Android. I understand the purpose, but they really need to think through the strange functionality and havoc they bring to websites. The latest change, is you can no longer "hide" the URL bar on page load on iOS or Chrome using scroll tricks.
EDIT: While the above script works perfectly for keeping the background from resizing, it causes a noticeable gap when users scroll down. This is because it is keeping the background sized to 100% of the screen height minus the URL bar. If we add 60px to the height, as swiss suggests, this problem goes away. It does mean we don't get to see the bottom 60px of the background image when the URL bar is present, but it prevents users from ever seeing a gap.
function resizeBackground() {
bg.height( $(window).height() + 60);
}
How can I get my Twitter Bootstrap buttons to right align?
Use button
tag instead of input
and use pull-right
class.
pull-right
class totally messes up both of your buttons, but you can fix this by defining custom margin on the right side.
<button class="btn btn-primary pull-right btn-sm RbtnMargin" type="button">Save</button>
<button class="btn btn-primary pull-right btn-sm" type="button">Cancel</button>
Then use the following CSS for the class
.RbtnMargin { margin-left: 5px; }
unique object identifier in javascript
Actually, you don't need to modify the object
prototype and add a function there. The following should work well for your purpose.
var __next_objid=1;
function objectId(obj) {
if (obj==null) return null;
if (obj.__obj_id==null) obj.__obj_id=__next_objid++;
return obj.__obj_id;
}
Can scripts be inserted with innerHTML?
Here a solution that does not use eval
, and works with scripts, linked scripts , as well as with modules.
The function accepts 3 parameters :
- html : String with the html code to insert
- dest : reference to the target element
- append : boolean flag to enable appending at the end of the target element html
function insertHTML(html, dest, append=false){
// if no append is requested, clear the target element
if(!append) dest.innerHTML = '';
// create a temporary container and insert provided HTML code
let container = document.createElement('div');
container.innerHTML = html;
// cache a reference to all the scripts in the container
let scripts = container.querySelectorAll('script');
// get all child elements and clone them in the target element
let nodes = container.childNodes;
for( let i=0; i< nodes.length; i++) dest.appendChild( nodes[i].cloneNode(true) );
// force the found scripts to execute...
for( let i=0; i< scripts.length; i++){
let script = document.createElement('script');
script.type = scripts[i].type || 'text/javascript';
if( scripts[i].hasAttribute('src') ) script.src = scripts[i].src;
script.innerHTML = scripts[i].innerHTML;
document.head.appendChild(script);
document.head.removeChild(script);
}
// done!
return true;
}
align text center with android
add layout_gravity and gravity with center value on TextView
<TextView
android:text="welcome text"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center"
android:gravity="center"
/>
Google Maps: Set Center, Set Center Point and Set more points
Try using this code for v3:
gMap = new google.maps.Map(document.getElementById('map'));
gMap.setZoom(13); // This will trigger a zoom_changed on the map
gMap.setCenter(new google.maps.LatLng(37.4419, -122.1419));
gMap.setMapTypeId(google.maps.MapTypeId.ROADMAP);
How to trigger event in JavaScript?
Use jquery event call.
Write the below line where you want to trigger onChange of any element.
$("#element_id").change();
element_id is the ID of the element whose onChange you want to trigger.
Avoid the use of
element.fireEvent("onchange");
Because it has very less support. Refer this document for its support.
What does "Content-type: application/json; charset=utf-8" really mean?
The header just denotes what the content is encoded in. It is not necessarily possible to deduce the type of the content from the content itself, i.e. you can't necessarily just look at the content and know what to do with it. That's what HTTP headers are for, they tell the recipient what kind of content they're (supposedly) dealing with.
Content-type: application/json; charset=utf-8
designates the content to be in JSON format, encoded in the UTF-8 character encoding. Designating the encoding is somewhat redundant for JSON, since the default (only?) encoding for JSON is UTF-8. So in this case the receiving server apparently is happy knowing that it's dealing with JSON and assumes that the encoding is UTF-8 by default, that's why it works with or without the header.
Does this encoding limit the characters that can be in the message body?
No. You can send anything you want in the header and the body. But, if the two don't match, you may get wrong results. If you specify in the header that the content is UTF-8 encoded but you're actually sending Latin1 encoded content, the receiver may produce garbage data, trying to interpret Latin1 encoded data as UTF-8. If of course you specify that you're sending Latin1 encoded data and you're actually doing so, then yes, you're limited to the 256 characters you can encode in Latin1.
How to execute .sql file using powershell?
Try to see if SQL snap-ins are present:
get-pssnapin -Registered
Name : SqlServerCmdletSnapin100
PSVersion : 2.0
Description : This is a PowerShell snap-in that includes various SQL Server cmdlets.
Name : SqlServerProviderSnapin100
PSVersion : 2.0
Description : SQL Server Provider
If so
Add-PSSnapin SqlServerCmdletSnapin100 # here lives Invoke-SqlCmd
Add-PSSnapin SqlServerProviderSnapin100
then you can do something like this:
invoke-sqlcmd -inputfile "c:\mysqlfile.sql" -serverinstance "servername\serverinstance" -database "mydatabase" # the parameter -database can be omitted based on what your sql script does.
How to override trait function and call it from the overridden function?
Your last one was almost there:
trait A {
function calc($v) {
return $v+1;
}
}
class MyClass {
use A {
calc as protected traitcalc;
}
function calc($v) {
$v++;
return $this->traitcalc($v);
}
}
The trait is not a class. You can't access its members directly. It's basically just automated copy and paste...
how to include glyphicons in bootstrap 3
I think your particular problem isn't how to use Glyphicons but understanding how Bootstrap files work together.
Bootstrap requires a specific file structure to work. I see from your code you have this:
<link href="bootstrap.css" rel="stylesheet" media="screen">
Your Bootstrap.css is being loaded from the same location as your page, this would create a problem if you didn't adjust your file structure.
But first, let me recommend you setup your folder structure like so:
/css <-- Bootstrap.css here
/fonts <-- Bootstrap fonts here
/img
/js <-- Bootstrap JavaScript here
index.html
If you notice, this is also how Bootstrap structures its files in its download ZIP.
You then include your Bootstrap file like so:
<link href="css/bootstrap.css" rel="stylesheet" media="screen">
or
<link href="./css/bootstrap.css" rel="stylesheet" media="screen">
or
<link href="/css/bootstrap.css" rel="stylesheet" media="screen">
Depending on your server structure or what you're going for.
The first and second are relative to your file's current directory. The second one is just more explicit by saying "here" (./) first then css folder (/css).
The third is good if you're running a web server, and you can just use relative to root notation as the leading "/" will be always start at the root folder.
So, why do this?
Bootstrap.css has this specific line for Glyphfonts:
@font-face {
font-family: 'Glyphicons Halflings';
src: url('../fonts/glyphicons-halflings-regular.eot');
src: url('../fonts/glyphicons-halflings-regular.eot?#iefix') format('embedded-opentype'), url('../fonts/glyphicons-halflings-regular.woff') format('woff'), url('../fonts/glyphicons-halflings-regular.ttf') format('truetype'), url('../fonts/glyphicons-halflings-regular.svg#glyphicons-halflingsregular') format('svg');
}
What you can see is that that Glyphfonts are loaded by going up one directory ../
and then looking for a folder called /fonts
and THEN loading the font file.
The URL address is relative to the location of the CSS file. So, if your CSS file is at the same location like this:
/fonts
Bootstrap.css
index.html
The CSS file is going one level deeper than looking for a /fonts
folder.
So, let's say the actual location of these files are:
C:\www\fonts
C:\www\Boostrap.css
C:\www\index.html
The CSS file would technically be looking for a folder at:
C:\fonts
but your folder is actually in:
C:\www\fonts
So see if that helps. You don't have to do anything 'special' to load Bootstrap Glyphicons, except make sure your folder structure is set up appropriately.
When you get that fixed, your HTML should simply be:
<span class="glyphicon glyphicon-comment"></span>
Note, you need both classes. The first class glyphicon
sets up the basic styles while glyphicon-comment
sets the specific image.
ImportError: No module named psycopg2
You need to install the psycopg2
module.
On CentOS:
Make sure Python 2.7+ is installed. If not, follow these instructions: http://toomuchdata.com/2014/02/16/how-to-install-python-on-centos/
# Python 2.7.6:
$ wget http://python.org/ftp/python/2.7.6/Python-2.7.6.tar.xz
$ tar xf Python-2.7.6.tar.xz
$ cd Python-2.7.6
$ ./configure --prefix=/usr/local --enable-unicode=ucs4 --enable-shared LDFLAGS="-Wl,-rpath /usr/local/lib"
$ make && make altinstall
$ yum install postgresql-libs
# First get the setup script for Setuptools:
$ wget https://bitbucket.org/pypa/setuptools/raw/bootstrap/ez_setup.py
# Then install it for Python 2.7 and/or Python 3.3:
$ python2.7 ez_setup.py
$ easy_install-2.7 psycopg2
Even though this is a CentOS question, here are the instructions for Ubuntu:
$ sudo apt-get install python3-pip python-distribute python-dev
$ easy_install psycopg2
Cite: http://initd.org/psycopg/install/
How to print a dictionary line by line in Python?
# Declare and Initialize Map
map = {}
map ["New"] = 1
map ["to"] = 1
map ["Python"] = 5
map ["or"] = 2
# Print Statement
for i in map:
print ("", i, ":", map[i])
# New : 1
# to : 1
# Python : 5
# or : 2
Cache an HTTP 'Get' service response in AngularJS?
An easier way to do this in the current stable version (1.0.6) requires a lot less code.
After setting up your module add a factory:
var app = angular.module('myApp', []);
// Configure routes and controllers and views associated with them.
app.config(function ($routeProvider) {
// route setups
});
app.factory('MyCache', function ($cacheFactory) {
return $cacheFactory('myCache');
});
Now you can pass this into your controller:
app.controller('MyController', function ($scope, $http, MyCache) {
$http.get('fileInThisCase.json', { cache: MyCache }).success(function (data) {
// stuff with results
});
});
One downside is that the key names are also setup automatically, which could make clearing them tricky. Hopefully they'll add in some way to get key names.
Round a double to 2 decimal places
For two rounding digits. Very simple and you are basically updating the variable instead of just display purposes which DecimalFormat does.
x = Math.floor(x * 100) / 100;
How do I set a conditional breakpoint in gdb, when char* x points to a string whose value equals "hello"?
Since GDB 7.5 you can use these native Convenience Functions:
$_memeq(buf1, buf2, length)
$_regex(str, regex)
$_streq(str1, str2)
$_strlen(str)
Seems quite less problematic than having to execute a "foreign" strcmp()
on the process' stack each time the breakpoint is hit. This is especially true for debugging multithreaded processes.
Note your GDB needs to be compiled with Python support, which is not an issue with current linux distros. To be sure, you can check it by running show configuration
inside GDB and searching for --with-python
. This little oneliner does the trick, too:
$ gdb -n -quiet -batch -ex 'show configuration' | grep 'with-python'
--with-python=/usr (relocatable)
For your demo case, the usage would be
break <where> if $_streq(x, "hello")
or, if your breakpoint already exists and you just want to add the condition to it
condition <breakpoint number> $_streq(x, "hello")
$_streq
only matches the whole string, so if you want something more cunning you should use $_regex
, which supports the Python regular expression syntax.
BAT file to open CMD in current directory
The simplest command to do this:
start
You can always run this in command line to open new command line window in the same location. Or you can place it in your .bat file.
Using if(isset($_POST['submit'])) to not display echo when script is open is not working
Whats wrong in this?
<form class="navbar-form navbar-right" method="post" action="login.php">
<div class="form-group">
<input type="email" name="email" class="form-control" placeholder="email">
<input type="password" name="password" class="form-control" placeholder="password">
</div>
<input type="submit" name="submit" value="submit" class="btn btn-success">
</form>
login.php
if(isset($_POST['submit']) && !empty($_POST['submit'])) {
// if (!logged_in())
echo 'asodj';
}
What is the use of ObservableCollection in .net?
One of the biggest uses is that you can bind UI components to one, and they'll respond appropriately if the collection's contents change. For example, if you bind a ListView's ItemsSource to one, the ListView's contents will automatically update if you modify the collection.
EDIT:
Here's some sample code from MSDN:
http://msdn.microsoft.com/en-us/library/ms748365.aspx
In C#, hooking the ListBox to the collection could be as easy as
listBox.ItemsSource = NameListData;
though if you haven't hooked the list up as a static resource and defined NameItemTemplate you may want to override PersonName's ToString(). For example:
public override ToString()
{
return string.Format("{0} {1}", this.FirstName, this.LastName);
}
A field initializer cannot reference the nonstatic field, method, or property
private dynamic defaultReminder = reminder.TimeSpanText[TimeSpan.FromMinutes(15)];
is a field initializer and executes first (before any field without an initializer is set to its default value and before the invoked instance constructor is executed). Instance fields that have no initializer will only have a legal (default) value after all instance field initializers are completed. Due to the initialization order, instance constructors are executed last, which is why the instance is not created yet the moment the initializers are executed. Therefore the compiler cannot allow any instance property (or field) to be referenced before the class instance is fully constructed. This is because any access to an instance variable like reminder
implicitly references the instance (this
) to tell the compiler the concrete memory location of the instance to use.
This is also the reason why this
is not allowed in an instance field initializer.
A variable initializer for an instance field cannot reference the
instance being created. Thus, it is a compile-time error to reference
this in a variable initializer, as it is a compile-time error for a
variable initializer to reference any instance member through a
simple_name.
The only type members that are guaranteed to be initialized before instance field initializers are executed are class (static) field initializers and class (static) constructors and class methods. Since static members are instance independent, they can be referenced at any time:
class SomeOtherClass
{
private static Reminders reminder = new Reminders();
// This operation is allowed,
// since the compiler can guarantee that the referenced class member is already initialized
// when this instance field initializer executes
private dynamic defaultReminder = reminder.TimeSpanText[TimeSpan.FromMinutes(15)];
}
That's why instance field initializers are only allowed to reference a class member (static member). This compiler initialization rules will ensure a deterministic type instantiation.
For more details I recommend this document: Microsoft Docs: Class declarations.
This means that an instance field that references another instance member to initialize its value, must be initialized from the instance constructor or the referenced member must be declared static
.
How to include scripts located inside the node_modules folder?
To use multiple files from node_modules in html, the best way I've found is to put them to an array and then loop on them to make them visible for web clients, for example to use filepond modules from node_modules:
const filePondModules = ['filepond-plugin-file-encode', 'filepond-plugin-image-preview', 'filepond-plugin-image-resize', 'filepond']
filePondModules.forEach(currentModule => {
let module_dir = require.resolve(currentModule)
.match(/.*\/node_modules\/[^/]+\//)[0];
app.use('/' + currentModule, express.static(module_dir + 'dist/'));
})
And then in the html (or layout) file, just call them like this :
<link rel="stylesheet" href="/filepond/filepond.css">
<link rel="stylesheet" href="/filepond-plugin-image-preview/filepond-plugin-image-preview.css">
...
<script src="/filepond-plugin-image-preview/filepond-plugin-image-preview.js" ></script>
<script src="/filepond-plugin-file-encode/filepond-plugin-file-encode.js"></script>
<script src="/filepond-plugin-image-resize/filepond-plugin-image-resize.js"></script>
<script src="/filepond/filepond.js"></script>
Injecting $scope into an angular service function()
The $scope
that you see being injected into controllers is not some service (like the rest of the injectable stuff), but is a Scope object. Many scope objects can be created (usually prototypically inheriting from a parent scope). The root of all scopes is the $rootScope
and you can create a new child-scope using the $new()
method of any scope (including the $rootScope
).
The purpose of a Scope is to "glue together" the presentation and the business logic of your app. It does not make much sense to pass a $scope
into a service.
Services are singleton objects used (among other things) to share data (e.g. among several controllers) and generally encapsulate reusable pieces of code (since they can be injected and offer their "services" in any part of your app that needs them: controllers, directives, filters, other services etc).
I am sure, various approaches would work for you. One is this:
Since the StudentService
is in charge of dealing with student data, you can have the StudentService
keep an array of students and let it "share" it with whoever might be interested (e.g. your $scope
). This makes even more sense, if there are other views/controllers/filters/services that need to have access to that info (if there aren't any right now, don't be surprised if they start popping up soon).
Every time a new student is added (using the service's save()
method), the service's own array of students will be updated and every other object sharing that array will get automatically updated as well.
Based on the approach described above, your code could look like this:
angular.
module('cfd', []).
factory('StudentService', ['$http', '$q', function ($http, $q) {
var path = 'data/people/students.json';
var students = [];
// In the real app, instead of just updating the students array
// (which will be probably already done from the controller)
// this method should send the student data to the server and
// wait for a response.
// This method returns a promise to emulate what would happen
// when actually communicating with the server.
var save = function (student) {
if (student.id === null) {
students.push(student);
} else {
for (var i = 0; i < students.length; i++) {
if (students[i].id === student.id) {
students[i] = student;
break;
}
}
}
return $q.resolve(student);
};
// Populate the students array with students from the server.
$http.get(path).then(function (response) {
response.data.forEach(function (student) {
students.push(student);
});
});
return {
students: students,
save: save
};
}]).
controller('someCtrl', ['$scope', 'StudentService',
function ($scope, StudentService) {
$scope.students = StudentService.students;
$scope.saveStudent = function (student) {
// Do some $scope-specific stuff...
// Do the actual saving using the StudentService.
// Once the operation is completed, the $scope's `students`
// array will be automatically updated, since it references
// the StudentService's `students` array.
StudentService.save(student).then(function () {
// Do some more $scope-specific stuff,
// e.g. show a notification.
}, function (err) {
// Handle the error.
});
};
}
]);
One thing you should be careful about when using this approach is to never re-assign the service's array, because then any other components (e.g. scopes) will be still referencing the original array and your app will break.
E.g. to clear the array in StudentService
:
/* DON'T DO THAT */
var clear = function () { students = []; }
/* DO THIS INSTEAD */
var clear = function () { students.splice(0, students.length); }
See, also, this short demo.
LITTLE UPDATE:
A few words to avoid the confusion that may arise while talking about using a service, but not creating it with the service()
function.
Quoting the docs on $provide
:
An Angular service is a singleton object created by a service factory. These service factories are functions which, in turn, are created by a service provider. The service providers are constructor functions. When instantiated they must contain a property called $get
, which holds the service factory function.
[...]
...the $provide
service has additional helper methods to register services without specifying a provider:
- provider(provider) - registers a service provider with the $injector
- constant(obj) - registers a value/object that can be accessed by providers and services.
- value(obj) - registers a value/object that can only be accessed by services, not providers.
- factory(fn) - registers a service factory function, fn, that will be wrapped in a service provider object, whose $get property will contain the given factory function.
- service(class) - registers a constructor function, class that will be wrapped in a service provider object, whose $get property will instantiate a new object using the given constructor function.
Basically, what it says is that every Angular service is registered using $provide.provider()
, but there are "shortcut" methods for simpler services (two of which are service()
and factory()
).
It all "boils down" to a service, so it doesn't make much difference which method you use (as long as the requirements for your service can be covered by that method).
BTW, provider
vs service
vs factory
is one of the most confusing concepts for Angular new-comers, but fortunately there are plenty of resources (here on SO) to make things easier. (Just search around.)
(I hope that clears it up - let me know if it doesn't.)
How to kill a running SELECT statement
There is no need to kill entire session. In Oracle 18c you could use ALTER SYSTEM CANCEL
:
Cancelling a SQL Statement in a Session
You can cancel a SQL statement in a session using the ALTER SYSTEM CANCEL SQL statement.
Instead of terminating a session, you can cancel a high-load SQL statement in a session. When you cancel a DML statement, the statement is rolled back.
ALTER SYSTEM CANCEL SQL 'SID, SERIAL[, @INST_ID][, SQL_ID]';
If @INST_ID is not specified, the instance ID of the current session is used.
If SQL_ID is not specified, the currently running SQL statement in the specified session is terminated.
How different is Objective-C from C++?
Off the top of my head:
- Styles - Obj-C is dynamic, C++ is
typically static
- Although they are both OOP, I'm
certain the solutions would be
different.
- Different object model (C++ is
restricted by its compile-time type
system).
To me, the biggest difference is the model system. Obj-C lets you do messaging and introspection, but C++ has the ever-so-powerful templates.
Each have their strengths.
get the titles of all open windows
Based on the previous answer that give me some errors, finaly I use this code with GetOpenedWindows
function:
public class InfoWindow
{
public IntPtr Handle = IntPtr.Zero;
public FileInfo File = new FileInfo( Application.ExecutablePath );
public string Title = Application.ProductName;
public override string ToString() {
return File.Name + "\t>\t" + Title;
}
}//CLASS
/// <summary>Contains functionality to get info on the open windows.</summary>
public static class RuningWindows
{
internal static event EventHandler WindowActivatedChanged;
internal static Timer TimerWatcher = new Timer();
internal static InfoWindow WindowActive = new InfoWindow();
internal static void DoStartWatcher() {
TimerWatcher.Interval = 500;
TimerWatcher.Tick += TimerWatcher_Tick;
TimerWatcher.Start();
}
/// <summary>Returns a dictionary that contains the handle and title of all the open windows.</summary>
/// <returns>A dictionary that contains the handle and title of all the open windows.</returns>
public static IDictionary<IntPtr , InfoWindow> GetOpenedWindows()
{
IntPtr shellWindow = GetShellWindow();
Dictionary<IntPtr , InfoWindow> windows = new Dictionary<IntPtr , InfoWindow>();
EnumWindows( new EnumWindowsProc( delegate( IntPtr hWnd , int lParam ) {
if ( hWnd == shellWindow ) return true;
if ( !IsWindowVisible( hWnd ) ) return true;
int length = GetWindowTextLength( hWnd );
if ( length == 0 ) return true;
StringBuilder builder = new StringBuilder( length );
GetWindowText( hWnd , builder , length + 1 );
var info = new InfoWindow();
info.Handle = hWnd;
info.File = new FileInfo( GetProcessPath( hWnd ) );
info.Title = builder.ToString();
windows[hWnd] = info;
return true;
} ) , 0 );
return windows;
}
private delegate bool EnumWindowsProc( IntPtr hWnd , int lParam );
public static string GetProcessPath( IntPtr hwnd )
{
uint pid = 0;
GetWindowThreadProcessId( hwnd , out pid );
if ( hwnd != IntPtr.Zero ) {
if ( pid != 0 ) {
var process = Process.GetProcessById( (int) pid );
if ( process != null ) {
return process.MainModule.FileName.ToString();
}
}
}
return "";
}
[DllImport( "USER32.DLL" )]
private static extern bool EnumWindows( EnumWindowsProc enumFunc , int lParam );
[DllImport( "USER32.DLL" )]
private static extern int GetWindowText( IntPtr hWnd , StringBuilder lpString , int nMaxCount );
[DllImport( "USER32.DLL" )]
private static extern int GetWindowTextLength( IntPtr hWnd );
[DllImport( "USER32.DLL" )]
private static extern bool IsWindowVisible( IntPtr hWnd );
[DllImport( "USER32.DLL" )]
private static extern IntPtr GetShellWindow();
[DllImport( "user32.dll" )]
private static extern IntPtr GetForegroundWindow();
//WARN: Only for "Any CPU":
[DllImport( "user32.dll" , CharSet = CharSet.Auto , SetLastError = true )]
private static extern int GetWindowThreadProcessId( IntPtr handle , out uint processId );
static void TimerWatcher_Tick( object sender , EventArgs e )
{
var windowActive = new InfoWindow();
windowActive.Handle = GetForegroundWindow();
string path = GetProcessPath( windowActive.Handle );
if ( string.IsNullOrEmpty( path ) ) return;
windowActive.File = new FileInfo( path );
int length = GetWindowTextLength( windowActive.Handle );
if ( length == 0 ) return;
StringBuilder builder = new StringBuilder( length );
GetWindowText( windowActive.Handle , builder , length + 1 );
windowActive.Title = builder.ToString();
if ( windowActive.ToString() != WindowActive.ToString() ) {
//fire:
WindowActive = windowActive;
if ( WindowActivatedChanged != null ) WindowActivatedChanged( sender , e );
Console.WriteLine( "Window: " + WindowActive.ToString() );
}
}
}//CLASS
Warning: You can only compil/debug under "Any CPU" to access to 32bits Apps...
Oracle Sql get only month and year in date datatype
Easiest solution is to create the column using the correct data type: DATE
For example:
Create table:
create table test_date (mydate date);
Insert row:
insert into test_date values (to_date('01-01-2011','dd-mm-yyyy'));
To get the month and year, do as follows:
select to_char(mydate, 'MM-YYYY') from test_date;
Your result will be as follows: 01-2011
Another cool function to use is "EXTRACT"
select extract(year from mydate) from test_date;
This will return: 2011
IOS 7 Navigation Bar text and arrow color
I think previous answers are correct , this is another way of doing the same thing. I am sharing it here with others just in case if it becomes useful for someone. This is how you can change the text/title color for the navbar in ios7:
UIColor *red = [UIColor colorWithRed:254.0f/255.0f green:0.0f/255.0f blue:0.0f/255.0f alpha:1.0];
NSMutableDictionary *navBarTextAttributes = [NSMutableDictionary dictionaryWithCapacity:1];
[navBarTextAttributes setObject:red forKey:NSForegroundColorAttributeName ];
self.navigationController.navigationBar.titleTextAttributes = navBarTextAttributes;