How to execute a bash command stored as a string with quotes and asterisk
Have you tried:
eval $cmd
For the follow-on question of how to escape *
since it has special meaning when it's naked or in double quoted strings: use single quotes.
MYSQL='mysql AMORE -u username -ppassword -h localhost -e'
QUERY="SELECT "'*'" FROM amoreconfig" ;# <-- "double"'single'"double"
eval $MYSQL "'$QUERY'"
Bonus: It also reads nice: eval mysql query ;-)
C# Linq Group By on multiple columns
var consolidatedChildren =
from c in children
group c by new
{
c.School,
c.Friend,
c.FavoriteColor,
} into gcs
select new ConsolidatedChild()
{
School = gcs.Key.School,
Friend = gcs.Key.Friend,
FavoriteColor = gcs.Key.FavoriteColor,
Children = gcs.ToList(),
};
var consolidatedChildren =
children
.GroupBy(c => new
{
c.School,
c.Friend,
c.FavoriteColor,
})
.Select(gcs => new ConsolidatedChild()
{
School = gcs.Key.School,
Friend = gcs.Key.Friend,
FavoriteColor = gcs.Key.FavoriteColor,
Children = gcs.ToList(),
});
Trim spaces from end of a NSString
Taken from this answer here: https://stackoverflow.com/a/5691567/251012
- (NSString *)stringByTrimmingTrailingCharactersInSet:(NSCharacterSet *)characterSet {
NSRange rangeOfLastWantedCharacter = [self rangeOfCharacterFromSet:[characterSet invertedSet]
options:NSBackwardsSearch];
if (rangeOfLastWantedCharacter.location == NSNotFound) {
return @"";
}
return [self substringToIndex:rangeOfLastWantedCharacter.location+1]; // non-inclusive
}
Finding the average of a list
There is a statistics library if you are using python >= 3.4
https://docs.python.org/3/library/statistics.html
You may use it's mean method like this. Let's say you have a list of numbers of which you want to find mean:-
list = [11, 13, 12, 15, 17]
import statistics as s
s.mean(list)
It has other methods too like stdev, variance, mode, harmonic mean, median etc which are too useful.
How to send 500 Internal Server Error error from a PHP script
You can simplify it like this:
if ( that_happened || something_else_happened )
{
header('X-Error-Message: Incorrect username or password', true, 500);
die;
}
It will return following header:
HTTP/1.1 500 Internal Server Error
...
X-Error-Message: Incorrect username or password
...
Added: If you need to know exactly what went wrong, do something like this:
if ( that_happened )
{
header('X-Error-Message: Incorrect username', true, 500);
die('Incorrect username');
}
if ( something_else_happened )
{
header('X-Error-Message: Incorrect password', true, 500);
die('Incorrect password');
}
SVN check out linux
There should be svn
utility on you box, if installed:
$ svn checkout http://example.com/svn/somerepo somerepo
This will check out a working copy from a specified repository to a directory somerepo
on our file system.
You may want to print commands, supported by this utility:
$ svn help
uname -a
output in your question is identical to one, used by Parallels Virtuozzo Containers for Linux 4.0 kernel, which is based on Red Hat 5 kernel, thus your friends are rpm
or the following command:
$ sudo yum install subversion
Why is my CSS style not being applied?
For me, the problem was incorrect content type of the served .css file (if it included certain unicode characters).
Changing the content-type to text/css
solved the problem.
SQL - Update multiple records in one query
Execute the below code if you want to update all record in all columns:
update config set column1='value',column2='value'...columnN='value';
and if you want to update all columns of a particular row then execute below code:
update config set column1='value',column2='value'...columnN='value' where column1='value'
Spring: @Component versus @Bean
@Component
Preferable for component scanning and automatic wiring.
When should you use @Bean?
Sometimes automatic configuration is not an option. When? Let's imagine that you want to wire components from 3rd-party libraries (you don't have the source code so you can't annotate its classes with @Component), so automatic configuration is not possible.
The @Bean annotation returns an object that spring should register as bean in application context. The body of the method bears the logic responsible for creating the instance.
Android Studio - local path doesn't exist
I managed to find a temporary workaround. Do all by yourself using command line :
// build apk
./gradlew assemble --daemon
// debug apk is unaligned so we need to align it
zipalign -f 4 app/build/apk/app-debug-unaligned.apk app/build/apk/app-debug.apk
// reinstall it using adb
adb install -r app/build/apk/app-debug.apk
This is temporary, but I hope they will fix this for 0.2.5
Edit : not fixed in 0.2.5
Edit2 : fixed for now by adding in my module.iml file (in facet/configuration) :
<option name="APK_PATH" value="/build/apk/appname-debug-unaligned.apk" />
Testing the type of a DOM element in JavaScript
You can use typeof(N)
to get the actual object type, but what you want to do is check the tag, not the type of the DOM element.
In that case, use the elem.tagName
or elem.nodeName
property.
if you want to get really creative, you can use a dictionary of tagnames and anonymous closures instead if a switch or if/else.
Reverse each individual word of "Hello World" string with Java
You need to do this on each word after you split
into an array
of words.
public String reverse(String word) {
char[] chs = word.toCharArray();
int i=0, j=chs.length-1;
while (i < j) {
// swap chs[i] and chs[j]
char t = chs[i];
chs[i] = chs[j];
chs[j] = t;
i++; j--;
}
return String.valueOf(chs);
}
Visual Studio Code Tab Key does not insert a tab
For those of you not about that space bar life (- _ - )( - _ -)
Keybinding for ? Tab isn't set to anything so you have to do it manually
Navigate to Preferences/Environment/Keybindings and search for "tab"
Click on Edit Binding at the bottom and press the tab key.
Press "Apply" then "Ok"
Key bound!
IEnumerable vs List - What to Use? How do they work?
The advantage of IEnumerable is deferred execution (usually with databases). The query will not get executed until you actually loop through the data. It's a query waiting until it's needed (aka lazy loading).
If you call ToList, the query will be executed, or "materialized" as I like to say.
There are pros and cons to both. If you call ToList, you may remove some mystery as to when the query gets executed. If you stick to IEnumerable, you get the advantage that the program doesn't do any work until it's actually required.
How to return a value from try, catch, and finally?
Here is another example that return's a boolean value using try/catch.
private boolean doSomeThing(int index){
try {
if(index%2==0)
return true;
} catch (Exception e) {
System.out.println(e.getMessage());
}finally {
System.out.println("Finally!!! ;) ");
}
return false;
}
Command prompt won't change directory to another drive
As @nasreddine answered or you can use /d
cd /d d:\Docs\Java
For more help on the cd
command use:
C:\Documents and Settings\kenny>help cd
Displays the name of or changes the current directory.
CHDIR [/D] [drive:][path]
CHDIR [..]
CD [/D] [drive:][path]
CD [..]
.. Specifies that you want to change to the parent directory.
Type CD drive: to display the current directory in the specified drive.
Type CD without parameters to display the current drive and directory.
Use the /D switch to change current drive in addition to changing current
directory for a drive.
If Command Extensions are enabled CHDIR changes as follows:
The current directory string is converted to use the same case as
the on disk names. So CD C:\TEMP would actually set the current
directory to C:\Temp if that is the case on disk.
CHDIR command does not treat spaces as delimiters, so it is possible to
CD into a subdirectory name that contains a space without surrounding
the name with quotes. For example:
cd \winnt\profiles\username\programs\start menu
is the same as:
cd "\winnt\profiles\username\programs\start menu"
which is what you would have to type if extensions were disabled.
Run react-native on android emulator
I had similar issue running emulator from android studio everytime, or on a physical device. Instead, you can quickly run android emulator from command line,
android avd
Once the emulator is running, you can check with adb devices
if the emulator shows up.
Then you can simply use
react-native run-android
to run the app on the emulator.
Make sure you've platform tools installed to be able to use adb
. Or you can use
brew install android-platform-tools
Update int column in table with unique incrementing values
Assuming that you have a primary key for this table (you should have), as well as using a CTE or a WITH, it is also possible to use an update with a self-join to the same table:
UPDATE a
SET a.interfaceId = b.sequence
FROM prices a
INNER JOIN
(
SELECT ROW_NUMBER() OVER ( ORDER BY b.priceId ) + ( SELECT MAX( interfaceId ) + 1 FROM prices ) AS sequence, b.priceId
FROM prices b
WHERE b.interfaceId IS NULL
) b ON b.priceId = a.priceId
I have assumed that the primary key is price-id.
The derived table, alias b, is used to generated the sequence via the ROW_NUMBER() function together with the primary key column(s). For each row where the column interface-id is NULL, this will generate a row with a unique sequence value together with the primary key value.
It is possible to order the sequence in some other order rather than the primary key.
The sequence is offset by the current MAX interface-id + 1 via a sub-query. The MAX() function ignores NULL values.
The WHERE clause limits the update to those rows that are NULL.
The derived table is then joined to the same table, alias a, joining on the primary key column(s) with the column to be updated set to the generated sequence.
bootstrap 3 wrap text content within div for horizontal alignment
Your code is working fine using bootatrap v3.3.7, but you can use word-break: break-word
if it's not working at your end.
which would then look like this -
_x000D_
_x000D_
<html>_x000D_
_x000D_
<head>_x000D_
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css"_x000D_
integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">_x000D_
</head>_x000D_
_x000D_
<body>_x000D_
<div class="row" style="box-shadow: 0 0 30px black;">_x000D_
<div class="col-6 col-sm-6 col-lg-4">_x000D_
<h3 style="word-break: break-word;">2005 Volkswagen Jetta 2.5 Sedan (worcester http://www.massmotorcars.com)_x000D_
$6900</h3>_x000D_
<p>_x000D_
<small>2005 volkswagen jetta 2.5 for sale has 110,000 miles powere doors,power windows,has ,car drives_x000D_
excellent ,comes with warranty if you're ...</small>_x000D_
</p>_x000D_
<p>_x000D_
<a class="btn btn-default" href="/search/1355/detail/" role="button">View details »</a>_x000D_
<button type="button" class="btn bookmark" id="1355">_x000D_
<span class="_x000D_
glyphicon glyphicon-star-empty "></span>_x000D_
</button>_x000D_
</p>_x000D_
</div>_x000D_
<!--/span-->_x000D_
<div class="col-6 col-sm-6 col-lg-4">_x000D_
<h3 style="word-break: break-word;">2006 Honda Civic EX Sedan (Worcester www.massmotorcars.com) $7950</h3>_x000D_
<p>_x000D_
<small>2006 honda civic ex has 110,176 miles, has power doors ,power windows,sun roof,alloy wheels,runs_x000D_
great, cd player, 4 cylinder engen, ...</small>_x000D_
</p>_x000D_
<p>_x000D_
<a class="btn btn-default" href="/search/1356/detail/" role="button">View details »</a>_x000D_
<button type="button" class="btn bookmark" id="1356">_x000D_
<span class="_x000D_
glyphicon glyphicon-star-empty "></span>_x000D_
</button>_x000D_
</p>_x000D_
_x000D_
</div>_x000D_
<!--/span-->_x000D_
<div class="col-6 col-sm-6 col-lg-4">_x000D_
<h3 style="word-break: break-word;">2004 Honda Civic LX Sedan (worcester www.massmotorcars.com) $5900</h3>_x000D_
<p>_x000D_
<small>2004 honda civic lx sedan has 134,000 miles, great looking car, interior and exterior looks_x000D_
nice,has_x000D_
cd player, power windows ...</small>_x000D_
</p>_x000D_
<p>_x000D_
<a class="btn btn-default" href="/search/1357/detail/" role="button">View details »</a>_x000D_
<button type="button" class="btn bookmark" id="1357">_x000D_
<span class="_x000D_
glyphicon glyphicon-star-empty "></span>_x000D_
</button>_x000D_
</p>_x000D_
</div>_x000D_
</div>_x000D_
</body>_x000D_
_x000D_
</html>
_x000D_
_x000D_
_x000D_
How to change the default browser to debug with in Visual Studio 2008?
To permanently make Visual Studio open a project in IE without changing the default browser you can do the following:
Project Properties -> Web -> Start Action
Start external program: C:\Program Files\Internet Explorer\iexplore.exe
Command line arguments: Enter the url of the path to your start page ie http:\localhost\myproject\default.aspx
This won't allow you to debug client side script in Visual Studio though.
How to convert string values from a dictionary, into int/float datatypes?
If you'd decide for a solution acting "in place" you could take a look at this one:
>>> d = [ { 'a':'1' , 'b':'2' , 'c':'3' }, { 'd':'4' , 'e':'5' , 'f':'6' } ]
>>> [dt.update({k: int(v)}) for dt in d for k, v in dt.iteritems()]
[None, None, None, None, None, None]
>>> d
[{'a': 1, 'c': 3, 'b': 2}, {'e': 5, 'd': 4, 'f': 6}]
Btw, key order is not preserved because that's the way standard dictionaries work, ie without the concept of order.
How to check file input size with jQuery?
Plese try this:
var sizeInKB = input.files[0].size/1024; //Normally files are in bytes but for KB divide by 1024 and so on
var sizeLimit= 30;
if (sizeInKB >= sizeLimit) {
alert("Max file size 30KB");
return false;
}
How to use Tomcat 8 in Eclipse?
The latest version of Springsource STS (3.6) supports Tomcat 8. It is based on eclipse Luna 4.4 and supports Java 8. Have at it!
Getting title and meta tags from external website
My solution (adapted from parts of cronoklee's & shamittomar's posts) so I can call it from anywhere and get a JSON return. Can be easily parsed into any content.
<?php
header('Content-type: application/json; charset=UTF-8');
if (!empty($_GET['url']))
{
file_get_contents_curl($_GET['url']);
}
else
{
echo "No Valid URL Provided.";
}
function file_get_contents_curl($url)
{
$ch = curl_init();
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
$data = curl_exec($ch);
curl_close($ch);
echo json_encode(getSiteOG($data), JSON_PRETTY_PRINT | JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);
}
function getSiteOG( $OGdata){
$doc = new DOMDocument();
@$doc->loadHTML($OGdata);
$res['title'] = $doc->getElementsByTagName('title')->item(0)->nodeValue;
foreach ($doc->getElementsByTagName('meta') as $m){
$tag = $m->getAttribute('name') ?: $m->getAttribute('property');
if(in_array($tag,['description','keywords']) || strpos($tag,'og:')===0) $res[str_replace('og:','',$tag)] = utf8_decode($m->getAttribute('content'));
}
return $res;
}
?>
Xcode 4 - "Valid signing identity not found" error on provisioning profiles on a new Macintosh install
I had the same error but the issue was slightly different.
We have a team of developers but we all use the same Apple ID (Developer Account), so when I generated the Provisioning profile, I kept getting the same error as in the subject question. Then although I had downloaded the certificate (that gets prompted as part of the Development Provisioning Assistant steps), I was still getting that error. Then I found the issue was that our Apple Developer account was using a Certificate that was generated on my work mate machine, so I needed to revoke it, and generate a new certificate, then create the provisioning profile.
The Summary, the lesson learned is that the certificate that is used for your provisioning profile must be generated on the same computer where the provisioning profile will be used. This is especially important to consider when you have a team of developers sharing the same Apple ID.
Hope it helps somebody
Insert text with single quotes in PostgreSQL
This is so many worlds of bad, because your question implies that you probably have gaping SQL injection holes in your application.
You should be using parameterized statements. For Java, use PreparedStatement
with placeholders. You say you don't want to use parameterised statements, but you don't explain why, and frankly it has to be a very good reason not to use them because they're the simplest, safest way to fix the problem you are trying to solve.
See Preventing SQL Injection in Java. Don't be Bobby's next victim.
There is no public function in PgJDBC for string quoting and escaping. That's partly because it might make it seem like a good idea.
There are built-in quoting functions quote_literal
and quote_ident
in PostgreSQL, but they are for PL/PgSQL
functions that use EXECUTE
. These days quote_literal
is mostly obsoleted by EXECUTE ... USING
, which is the parameterised version, because it's safer and easier. You cannot use them for the purpose you explain here, because they're server-side functions.
Imagine what happens if you get the value ');DROP SCHEMA public;--
from a malicious user. You'd produce:
insert into test values (1,'');DROP SCHEMA public;--');
which breaks down to two statements and a comment that gets ignored:
insert into test values (1,'');
DROP SCHEMA public;
--');
Whoops, there goes your database.
SelectedValue vs SelectedItem.Value of DropDownList
Be careful using SelectedItem.Text...
If there is no item selected, then SelectedItem will be null and SelectedItem.Text will generate a null-value exception.
.NET should have provided a SelectedText property like the SelectedValue property that returns String.Empty when there is no selected item.
What are Keycloak's OAuth2 / OpenID Connect endpoints?
FQDN/auth/realms/{realm_name}/.well-known/openid-configuration
you will see everything here, plus if the identity provider is also Keycloak then feeding this URL will setup everything also true with other identity providers if they support and they already handled it
How to hide command output in Bash
You should not use bash in this case to get rid of the output. Yum does have an option -q
which suppresses the output.
You'll most certainly also want to use -y
echo "Installing nano..."
yum -y -q install nano
To see all the options for yum, use man yum
.
java.lang.NoClassDefFoundError: Could not initialize class XXX
I had the same exception - but only while running in debug mode,
this is how I solved the problem (after 3 whole days):
in the build.gradle i had :
"multiDexEnabled true" set in the defaultConfig section.
defaultConfig {
applicationId "com.xxx.yyy"
minSdkVersion 15
targetSdkVersion 28
versionCode 5123
versionName "5123"
// Enabling multidex support.
multiDexEnabled true
}
but apparently this wasn't enough.
but when i changed:
public class MyAppClass extends Application
to:
public class MyAppClass extends MultiDexApplication
this solved it.
hope this will help someone
SQL Server Linked Server Example Query
Following Query is work best.
Try this Query:
SELECT * FROM OPENQUERY([LINKED_SERVER_NAME], 'SELECT * FROM [DATABASE_NAME].[SCHEMA].[TABLE_NAME]')
It Very helps to link MySQL to MS SQL
Can we have functions inside functions in C++?
As others have mentioned, you can use nested functions by using the gnu language extensions in gcc. If you (or your project) sticks to the gcc toolchain, your code will be mostly portable across the different architectures targeted by the gcc compiler.
However, if there is a possible requirement that you might need to compile code with a different toolchain, then I'd stay away from such extensions.
I'd also tread with care when using nested functions. They are a beautiful solution for managing the structure of complex, yet cohesive blocks of code (the pieces of which are not meant for external/general use.) They are also very helpful in controlling namespace pollution (a very real concern with naturally complex/long classes in verbose languages.)
But like anything, they can be open to abuse.
It is sad that C/C++ does not support such features as an standard. Most pascal variants and Ada do (almost all Algol-based languages do). Same with JavaScript. Same with modern languages like Scala. Same with venerable languages like Erlang, Lisp or Python.
And just as with C/C++, unfortunately, Java (with which I earn most of my living) does not.
I mention Java here because I see several posters suggesting usage of classes and class' methods as alternatives to nested functions. And that's also the typical workaround in Java.
Short answer: No.
Doing so tend to introduce artificial, needless complexity on a class hierarchy. With all things being equal, the ideal is to have a class hierarchy (and its encompassing namespaces and scopes) representing an actual domain as simple as possible.
Nested functions help deal with "private", within-function complexity. Lacking those facilities, one should try to avoid propagating that "private" complexity out and into one's class model.
In software (and in any engineering discipline), modeling is a matter of trade-offs. Thus, in real life, there will be justified exceptions to those rules (or rather guidelines). Proceed with care, though.
Import Excel to Datagridview
Since you have not replied to my comment above, I am posting a solution for both.
You are missing '
in Extended Properties
For Excel 2003 try this (TRIED AND TESTED)
private void button1_Click(object sender, EventArgs e)
{
String name = "Items";
String constr = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" +
"C:\\Sample.xls" +
";Extended Properties='Excel 8.0;HDR=YES;';";
OleDbConnection con = new OleDbConnection(constr);
OleDbCommand oconn = new OleDbCommand("Select * From [" + name + "$]", con);
con.Open();
OleDbDataAdapter sda = new OleDbDataAdapter(oconn);
DataTable data = new DataTable();
sda.Fill(data);
grid_items.DataSource = data;
}
BTW, I stopped working with Jet longtime ago. I use ACE now.
private void button1_Click(object sender, EventArgs e)
{
String name = "Items";
String constr = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" +
"C:\\Sample.xls" +
";Extended Properties='Excel 8.0;HDR=YES;';";
OleDbConnection con = new OleDbConnection(constr);
OleDbCommand oconn = new OleDbCommand("Select * From [" + name + "$]", con);
con.Open();
OleDbDataAdapter sda = new OleDbDataAdapter(oconn);
DataTable data = new DataTable();
sda.Fill(data);
grid_items.DataSource = data;
}
For Excel 2007+
private void button1_Click(object sender, EventArgs e)
{
String name = "Items";
String constr = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" +
"C:\\Sample.xlsx" +
";Extended Properties='Excel 12.0 XML;HDR=YES;';";
OleDbConnection con = new OleDbConnection(constr);
OleDbCommand oconn = new OleDbCommand("Select * From [" + name + "$]", con);
con.Open();
OleDbDataAdapter sda = new OleDbDataAdapter(oconn);
DataTable data = new DataTable();
sda.Fill(data);
grid_items.DataSource = data;
}
Easy way to test an LDAP User's Credentials
You should check out Softerra's LDAP Browser (the free version of LDAP Administrator), which can be downloaded here :
http://www.ldapbrowser.com/download.htm
I've used this application extensively for all my Active Directory, OpenLDAP, and Novell eDirectory development, and it has been absolutely invaluable.
If you just want to check and see if a username\password combination works, all you need to do is create a "Profile" for the LDAP server, and then enter the credentials during Step 3 of the creation process :
By clicking "Finish", you'll effectively issue a bind to the server using the credentials, auth mechanism, and password you've specified. You'll be prompted if the bind does not work.
Select subset of columns in data.table R
This seems an improvement:
> cols<-!(colnames(dt) %in% c("V1","V2","V3","V5"))
> new_dt<-subset(dt,,cols)
> cor(new_dt)
V4 V6 V7 V8 V9 V10
V4 1.0000000 0.14141578 -0.44466832 0.23697216 -0.1020074 0.48171747
V6 0.1414158 1.00000000 -0.21356218 -0.08510977 -0.1884202 -0.22242274
V7 -0.4446683 -0.21356218 1.00000000 -0.02050846 0.3209454 -0.15021528
V8 0.2369722 -0.08510977 -0.02050846 1.00000000 0.4627034 -0.07020571
V9 -0.1020074 -0.18842023 0.32094540 0.46270335 1.0000000 -0.19224973
V10 0.4817175 -0.22242274 -0.15021528 -0.07020571 -0.1922497 1.00000000
This one is not quite as easy to grasp but might have use for situations there there were a need to specify columns by a numeric vector:
subset(dt, , !grepl(paste0("V", c(1:3,5),collapse="|"),colnames(dt) ))
How to display my location on Google Maps for Android API v2
Before enabling the My Location layer, you must request location permission from the user. This sample does not include a request for location permission.
To simplify, in terms of lines of code, the request for the location permit can be made using the library EasyPermissions.
Then following the example of the official documentation of The My Location Layer my code works as follows for all versions of Android that contain Google services.
- Create an activity that contains a map and implements the interfaces
OnMyLocationClickListener
y OnMyLocationButtonClickListener
.
- Define in app/build.gradle
implementation 'pub.devrel:easypermissions:2.0.1'
Forward results to EasyPermissions within method onRequestPermissionsResult()
EasyPermissions.onRequestPermissionsResult(requestCode, permissions, grantResults, this);
Request permission and operate according to the user's response with requestLocationPermission()
- Call
requestLocationPermission()
and set the listeners to onMapReady()
.
MapsActivity.java
public class MapsActivity extends FragmentActivity implements
OnMapReadyCallback,
GoogleMap.OnMyLocationClickListener,
GoogleMap.OnMyLocationButtonClickListener {
private final int REQUEST_LOCATION_PERMISSION = 1;
private GoogleMap mMap;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
// Obtain the SupportMapFragment and get notified when the map is ready to be used.
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
}
@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
requestLocationPermission();
mMap.setOnMyLocationButtonClickListener(this);
mMap.setOnMyLocationClickListener(this);
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
// Forward results to EasyPermissions
EasyPermissions.onRequestPermissionsResult(requestCode, permissions, grantResults, this);
}
@SuppressLint("MissingPermission")
@AfterPermissionGranted(REQUEST_LOCATION_PERMISSION)
public void requestLocationPermission() {
String[] perms = {Manifest.permission.ACCESS_FINE_LOCATION};
if(EasyPermissions.hasPermissions(this, perms)) {
mMap.setMyLocationEnabled(true);
Toast.makeText(this, "Permission already granted", Toast.LENGTH_SHORT).show();
}
else {
EasyPermissions.requestPermissions(this, "Please grant the location permission", REQUEST_LOCATION_PERMISSION, perms);
}
}
@Override
public boolean onMyLocationButtonClick() {
Toast.makeText(this, "MyLocation button clicked", Toast.LENGTH_SHORT).show();
return false;
}
@Override
public void onMyLocationClick(@NonNull Location location) {
Toast.makeText(this, "Current location:\n" + location, Toast.LENGTH_LONG).show();
}
}
Source
Several ports (8005, 8080, 8009) required by Tomcat Server at localhost are already in use
What I did after reading all the suggested answer and as I know my port was already in use. I double clicked on Tomcat under the Servers tab in eclipse and it opened overview information and then find port information. Just changed conflicting port as mine was 8009 port (error mentioned during starting the server). I have changed it to 8008 and it works fine. Give a try if the changed port would not be in use server will start.
Using --add-host or extra_hosts with docker-compose
Basic docker-compose.yml
with extra hosts:
version: '3'
services:
api:
build: .
ports:
- "5003:5003"
extra_hosts:
- "your-host.name.com:162.242.195.82" #host and ip
- "your-host--1.name.com your-host--2.name.com:50.31.209.229" #multiple hostnames with same ip
The content in the /etc/hosts
file in the created container:
162.242.195.82 your-host.name.com
50.31.209.229 your-host--1.name.com your-host--2.name.com
You can check the /etc/hosts
file with the following commands:
$ docker-compose -f path/to/file/docker-compose.yml run api bash # 'api' is service name
#then inside container bash
root@f7c436910676:/app# cat /etc/hosts
Why does the JFrame setSize() method not set the size correctly?
I know that this question is about 6+ years old, but the answer by @Kyle doesn't work.
Using this
setSize(width - (getInsets().left + getInsets().right), height - (getInsets().top + getInsets().bottom));
But this always work in any size:
setSize(width + 14, height + 7);
If you don't want the border to border, and only want the white area, here:
setSize(width + 16, height + 39);
Also this only works on Windows 10, for MacOS users, use @ben's answer.
Changing text of UIButton programmatically swift
Swift 3
When you make the @IBAction:
@IBAction func btnAction(_ sender: UIButton) {
sender.setTitle("string goes here", for: .normal)
}
This sets the sender as UIButton (instead of Any) so it targets the btnAction as a UIButton
Can't start Tomcat as Windows Service
The simplest answer that worked for me was the one mentioned by Prashant, and edited by Bluish.
Go to Start > Configure Tomcat > Startup > Mode = Java Shutdown > Mode
= Java
Unfortunately I had(and possibly others) to do this in a different way, I went to the tomcat bin directory and ran the "tomcat7w" application, which is how I changed the configuration.
There I was able to change the startup mode and shutdown mode to Java. Like this:
Step1) Locate
tomcat7w:
general location => %TomCatHomeDIR%/bin
In my case tomcat was in the xampp folder so my address was:
C:\xampp\tomcat\bin
tomcat7w file location screenshot
Step2) Launch tomcat7w && change the Mode in the Startup and Shutdown tabs
tomcat7w startup tab screenshot
Note >This based on version 7.0.22 that comes standard with XAMPP.
Is it possible to decompile an Android .apk file?
Decompilation of APK file is possible. But it might be difficult to understand the code if it is obfuscated.
ApkTool to view resources inside APK File
- Extracts AndroidManifest.xml and everything in res folder(layout xml files, images, htmls used on webview etc..)
- command :
apktool.bat d sampleApp.apk
- NOTE: You can achieve this by using zip utility like 7-zip. But, It also extracts the .smali file of all .class files.
Using dex2jar
- Generates .jar file from .apk file, we need JD-GUI to view the source code from this .jar.
- command :
dex2jar sampleApp.apk
Decompiling .jar using JD-GUI
- decompiles the .class files (obfuscated- in a case of the android app, but a readable original code is obtained in a case of other .jar file). i.e., we get .java back from the application.
How to post pictures to instagram using API
I tried using IFTTT and many other services but all were doing things or post from Instagram to another platform not to Instagram. I read more to found Instagram does not provide any such API as of now.
Using blue stack is again involving heavy installation and doing things manually only.
However, you can use your Google Chrome on the desktop version to make a post on Instagram. It needs a bit tweak.
- Open your chrome and browse Instagram.com
- Go to inspect element by right clicking on chrome.
- From top right corener menu drop down on developer tools, select more tool.
- Further select network conditions.
- In the network selection section, see the second section there named user agent.
- Uncheck select automatically, and select chrome for Android from the list of given user agent.
- Refresh your Instagram.com page.
You will notice a change in UI and the option to make a post on Instagram.
Your life is now easy.
Let me know an easier way if you can find any.
I wrote on https://www.inteligentcomp.com/2018/11/how-to-upload-to-instagram-from-pc-mac.html about it.
Working Screenshot
Remove items from one list in another
You can use Except:
List<car> list1 = GetTheList();
List<car> list2 = GetSomeOtherList();
List<car> result = list2.Except(list1).ToList();
You probably don't even need those temporary variables:
List<car> result = GetSomeOtherList().Except(GetTheList()).ToList();
Note that Except
does not modify either list - it creates a new list with the result.
Logger slf4j advantages of formatting with {} instead of string concatenation
It is about string concatenation performance. It's potentially significant if your have dense logging statements.
(Prior to SLF4J 1.7) But only two parameters are possible
Because the vast majority of logging statements have 2 or fewer parameters, so SLF4J API up to version 1.6 covers (only) the majority of use cases. The API designers have provided overloaded methods with varargs parameters since API version 1.7.
For those cases where you need more than 2 and you're stuck with pre-1.7 SLF4J, then just use either string concatenation or new Object[] { param1, param2, param3, ... }
. There should be few enough of them that the performance is not as important.
Try-catch speeding up my code?
Well, the way you're timing things looks pretty nasty to me. It would be much more sensible to just time the whole loop:
var stopwatch = Stopwatch.StartNew();
for (int i = 1; i < 100000000; i++)
{
Fibo(100);
}
stopwatch.Stop();
Console.WriteLine("Elapsed time: {0}", stopwatch.Elapsed);
That way you're not at the mercy of tiny timings, floating point arithmetic and accumulated error.
Having made that change, see whether the "non-catch" version is still slower than the "catch" version.
EDIT: Okay, I've tried it myself - and I'm seeing the same result. Very odd. I wondered whether the try/catch was disabling some bad inlining, but using [MethodImpl(MethodImplOptions.NoInlining)]
instead didn't help...
Basically you'll need to look at the optimized JITted code under cordbg, I suspect...
EDIT: A few more bits of information:
- Putting the try/catch around just the
n++;
line still improves performance, but not by as much as putting it around the whole block
- If you catch a specific exception (
ArgumentException
in my tests) it's still fast
- If you print the exception in the catch block it's still fast
- If you rethrow the exception in the catch block it's slow again
- If you use a finally block instead of a catch block it's slow again
- If you use a finally block as well as a catch block, it's fast
Weird...
EDIT: Okay, we have disassembly...
This is using the C# 2 compiler and .NET 2 (32-bit) CLR, disassembling with mdbg (as I don't have cordbg on my machine). I still see the same performance effects, even under the debugger. The fast version uses a try
block around everything between the variable declarations and the return statement, with just a catch{}
handler. Obviously the slow version is the same except without the try/catch. The calling code (i.e. Main) is the same in both cases, and has the same assembly representation (so it's not an inlining issue).
Disassembled code for fast version:
[0000] push ebp
[0001] mov ebp,esp
[0003] push edi
[0004] push esi
[0005] push ebx
[0006] sub esp,1Ch
[0009] xor eax,eax
[000b] mov dword ptr [ebp-20h],eax
[000e] mov dword ptr [ebp-1Ch],eax
[0011] mov dword ptr [ebp-18h],eax
[0014] mov dword ptr [ebp-14h],eax
[0017] xor eax,eax
[0019] mov dword ptr [ebp-18h],eax
*[001c] mov esi,1
[0021] xor edi,edi
[0023] mov dword ptr [ebp-28h],1
[002a] mov dword ptr [ebp-24h],0
[0031] inc ecx
[0032] mov ebx,2
[0037] cmp ecx,2
[003a] jle 00000024
[003c] mov eax,esi
[003e] mov edx,edi
[0040] mov esi,dword ptr [ebp-28h]
[0043] mov edi,dword ptr [ebp-24h]
[0046] add eax,dword ptr [ebp-28h]
[0049] adc edx,dword ptr [ebp-24h]
[004c] mov dword ptr [ebp-28h],eax
[004f] mov dword ptr [ebp-24h],edx
[0052] inc ebx
[0053] cmp ebx,ecx
[0055] jl FFFFFFE7
[0057] jmp 00000007
[0059] call 64571ACB
[005e] mov eax,dword ptr [ebp-28h]
[0061] mov edx,dword ptr [ebp-24h]
[0064] lea esp,[ebp-0Ch]
[0067] pop ebx
[0068] pop esi
[0069] pop edi
[006a] pop ebp
[006b] ret
Disassembled code for slow version:
[0000] push ebp
[0001] mov ebp,esp
[0003] push esi
[0004] sub esp,18h
*[0007] mov dword ptr [ebp-14h],1
[000e] mov dword ptr [ebp-10h],0
[0015] mov dword ptr [ebp-1Ch],1
[001c] mov dword ptr [ebp-18h],0
[0023] inc ecx
[0024] mov esi,2
[0029] cmp ecx,2
[002c] jle 00000031
[002e] mov eax,dword ptr [ebp-14h]
[0031] mov edx,dword ptr [ebp-10h]
[0034] mov dword ptr [ebp-0Ch],eax
[0037] mov dword ptr [ebp-8],edx
[003a] mov eax,dword ptr [ebp-1Ch]
[003d] mov edx,dword ptr [ebp-18h]
[0040] mov dword ptr [ebp-14h],eax
[0043] mov dword ptr [ebp-10h],edx
[0046] mov eax,dword ptr [ebp-0Ch]
[0049] mov edx,dword ptr [ebp-8]
[004c] add eax,dword ptr [ebp-1Ch]
[004f] adc edx,dword ptr [ebp-18h]
[0052] mov dword ptr [ebp-1Ch],eax
[0055] mov dword ptr [ebp-18h],edx
[0058] inc esi
[0059] cmp esi,ecx
[005b] jl FFFFFFD3
[005d] mov eax,dword ptr [ebp-1Ch]
[0060] mov edx,dword ptr [ebp-18h]
[0063] lea esp,[ebp-4]
[0066] pop esi
[0067] pop ebp
[0068] ret
In each case the *
shows where the debugger entered in a simple "step-into".
EDIT: Okay, I've now looked through the code and I think I can see how each version works... and I believe the slower version is slower because it uses fewer registers and more stack space. For small values of n
that's possibly faster - but when the loop takes up the bulk of the time, it's slower.
Possibly the try/catch block forces more registers to be saved and restored, so the JIT uses those for the loop as well... which happens to improve the performance overall. It's not clear whether it's a reasonable decision for the JIT to not use as many registers in the "normal" code.
EDIT: Just tried this on my x64 machine. The x64 CLR is much faster (about 3-4 times faster) than the x86 CLR on this code, and under x64 the try/catch block doesn't make a noticeable difference.
CheckBox in RecyclerView keeps on checking different items
Complete example
public class ChildAddressAdapter extends RecyclerView.Adapter<ChildAddressAdapter.CartViewHolder> {
private Activity context;
private List<AddressDetail> addressDetailList;
private int selectedPosition = -1;
public ChildAddressAdapter(Activity context, List<AddressDetail> addressDetailList) {
this.context = context;
this.addressDetailList = addressDetailList;
}
@NonNull
@Override
public CartViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
LayoutInflater inflater = LayoutInflater.from(context);
View myView = inflater.inflate(R.layout.address_layout, parent, false);
return new CartViewHolder(myView);
}
@Override
public void onBindViewHolder(@NonNull CartViewHolder holder, int position) {
holder.adress_checkbox.setOnClickListener(view -> {
selectedPosition = holder.getAdapterPosition();
notifyDataSetChanged();
});
if (selectedPosition==position){
holder.adress_checkbox.setChecked(true);
}
else {
holder.adress_checkbox.setChecked(false);
}
}
@Override
public int getItemCount() {
return addressDetailList.size();
}
class CartViewHolder extends RecyclerView.ViewHolder
{
TextView address_text,address_tag;
CheckBox adress_checkbox;
CartViewHolder(View itemView) {
super(itemView);
address_text = itemView.findViewById(R.id.address_text);
address_tag = itemView.findViewById(R.id.address_tag);
adress_checkbox = itemView.findViewById(R.id.adress_checkbox);
}
}
}
Java format yyyy-MM-dd'T'HH:mm:ss.SSSz to yyyy-mm-dd HH:mm:ss
I was trying to format the date string received from a JSON response e.g. 2016-03-09T04:50:00-0800 to yyyy-MM-dd. So here's what I tried and it worked and helped me assign the formatted date string a calendar widget.
String DATE_FORMAT_I = "yyyy-MM-dd'T'HH:mm:ss";
String DATE_FORMAT_O = "yyyy-MM-dd";
SimpleDateFormat formatInput = new SimpleDateFormat(DATE_FORMAT_I);
SimpleDateFormat formatOutput = new SimpleDateFormat(DATE_FORMAT_O);
Date date = formatInput.parse(member.getString("date"));
String dateString = formatOutput.format(date);
This worked. Thanks.
MongoDB - Update objects in a document's array (nested updating)
There is no way to do this in single query. You have to search the document in first query:
If document exists:
db.bar.update( {user_id : 123456 , "items.item_name" : "my_item_two" } ,
{$inc : {"items.$.price" : 1} } ,
false ,
true);
Else
db.bar.update( {user_id : 123456 } ,
{$addToSet : {"items" : {'item_name' : "my_item_two" , 'price' : 1 }} } ,
false ,
true);
No need to add condition {$ne : "my_item_two" }
.
Also in multithreaded enviourment you have to be careful that only one thread can execute the second (insert case, if document did not found) at a time, otherwise duplicate embed documents will be inserted.
What is the best method to merge two PHP objects?
This snippet of code will recursively convert that data to a single type (array or object) without the nested foreach loops. Hope it helps someone!
Once an Object is in array format you can use array_merge and convert back to Object if you need to.
abstract class Util {
public static function object_to_array($d) {
if (is_object($d))
$d = get_object_vars($d);
return is_array($d) ? array_map(__METHOD__, $d) : $d;
}
public static function array_to_object($d) {
return is_array($d) ? (object) array_map(__METHOD__, $d) : $d;
}
}
Procedural way
function object_to_array($d) {
if (is_object($d))
$d = get_object_vars($d);
return is_array($d) ? array_map(__FUNCTION__, $d) : $d;
}
function array_to_object($d) {
return is_array($d) ? (object) array_map(__FUNCTION__, $d) : $d;
}
All credit goes to: Jason Oakley
Vue v-on:click does not work on component
As mentioned by Chris Fritz (Vue.js Core Team Emeriti) in VueCONF US 2019
if we had Kia enter .native
and then the root element of the base input changed from an input to a label suddenly this component is broken and it's not obvious and in fact, you might not even catch it right away unless you have a really good test. Instead by avoiding the use of the .native
modifier which I currently consider an anti-pattern will be removed in Vue 3 you'll be able to explicitly define that the parent might care about which element listeners are added to...
With Vue 2
Using $listeners
:
So, if you are using Vue 2 a better option to resolve this issue would be to use a fully transparent wrapper logic. For this Vue provides a $listeners
property containing an object of listeners being used on the component. For example:
{
focus: function (event) { /* ... */ }
input: function (value) { /* ... */ },
}
and then we just need to add v-on="$listeners"
to the test
component like:
Test.vue (child component)
<template>
<div v-on="$listeners">
click here
</div>
</template>
Now the <test>
component is a fully transparent wrapper, meaning it can be used exactly like a normal <div>
element: all the listeners will work, without the .native
modifier.
Demo:
_x000D_
_x000D_
Vue.component('test', {_x000D_
template: `_x000D_
<div class="child" v-on="$listeners">_x000D_
Click here_x000D_
</div>`_x000D_
})_x000D_
_x000D_
new Vue({_x000D_
el: "#myApp",_x000D_
data: {},_x000D_
methods: {_x000D_
testFunction: function(event) {_x000D_
console.log('test clicked')_x000D_
}_x000D_
}_x000D_
})
_x000D_
div.child{border:5px dotted orange; padding:20px;}
_x000D_
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.17/vue.min.js"></script>_x000D_
<div id="myApp">_x000D_
<test @click="testFunction"></test>_x000D_
</div>
_x000D_
_x000D_
_x000D_
Using $emit
method:
We can also use $emit
method for this purpose, which helps us to listen to child components events in parent component. For this, we first need to emit a custom event from child component like:
Test.vue (child component)
<test @click="$emit('my-event')"></test>
Important: Always use kebab-case for event names. For more information and demo regading this point please check out this answer: VueJS passing computed value from component to parent.
Now, we just need to listen to this emitted custom event in parent component like:
App.vue
<test @my-event="testFunction"></test>
So, basically instead of v-on:click
or the shorthand @click
we will simply use v-on:my-event
or just @my-event
.
Demo:
_x000D_
_x000D_
Vue.component('test', {_x000D_
template: `_x000D_
<div class="child" @click="$emit('my-event')">_x000D_
Click here_x000D_
</div>`_x000D_
})_x000D_
_x000D_
new Vue({_x000D_
el: "#myApp",_x000D_
data: {},_x000D_
methods: {_x000D_
testFunction: function(event) {_x000D_
console.log('test clicked')_x000D_
}_x000D_
}_x000D_
})
_x000D_
div.child{border:5px dotted orange; padding:20px;}
_x000D_
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.17/vue.min.js"></script>_x000D_
<div id="myApp">_x000D_
<test @my-event="testFunction"></test>_x000D_
</div>
_x000D_
_x000D_
_x000D_
With Vue 3
Using v-bind="$attrs"
:
Vue 3 is going to make our life much easier in many ways. One of the examples for it is that it will help us to create a simpler transparent wrapper with very less config by just using v-bind="$attrs"
. By using this on child components not only our listener will work directly from the parent but also any other attribute will also work just like it a normal <div>
only.
So, with respect to this question, we will not need to update anything in Vue 3 and your code will still work fine as <div>
is the root element here and it will automatically listen to all child events.
Demo #1:
_x000D_
_x000D_
const { createApp } = Vue;_x000D_
_x000D_
const Test = {_x000D_
template: `_x000D_
<div class="child">_x000D_
Click here_x000D_
</div>`_x000D_
};_x000D_
_x000D_
const App = {_x000D_
components: { Test },_x000D_
setup() {_x000D_
const testFunction = event => {_x000D_
console.log("test clicked");_x000D_
};_x000D_
return { testFunction };_x000D_
}_x000D_
};_x000D_
_x000D_
createApp(App).mount("#myApp");
_x000D_
div.child{border:5px dotted orange; padding:20px;}
_x000D_
<script src="//unpkg.com/vue@next"></script>_x000D_
<div id="myApp">_x000D_
<test v-on:click="testFunction"></test>_x000D_
</div>
_x000D_
_x000D_
_x000D_
But for complex components with nested elements where we need to apply attributes and events to main <input />
instead of the parent label we can simply use v-bind="$attrs"
Demo #2:
_x000D_
_x000D_
const { createApp } = Vue;_x000D_
_x000D_
const BaseInput = {_x000D_
props: ['label', 'value'],_x000D_
template: `_x000D_
<label>_x000D_
{{ label }}_x000D_
<input v-bind="$attrs">_x000D_
</label>`_x000D_
};_x000D_
_x000D_
const App = {_x000D_
components: { BaseInput },_x000D_
setup() {_x000D_
const search = event => {_x000D_
console.clear();_x000D_
console.log("Searching...", event.target.value);_x000D_
};_x000D_
return { search };_x000D_
}_x000D_
};_x000D_
_x000D_
createApp(App).mount("#myApp");
_x000D_
input{padding:8px;}
_x000D_
<script src="//unpkg.com/vue@next"></script>_x000D_
<div id="myApp">_x000D_
<base-input _x000D_
label="Search: "_x000D_
placeholder="Search"_x000D_
@keyup="search">_x000D_
</base-input><br/>_x000D_
</div>
_x000D_
_x000D_
_x000D_
How to Allow Remote Access to PostgreSQL database
This is a complementary answer for the specific case of you using AWS cloud computing (either EC2 or RDS machines).
Besides doing everything proposed above, when using AWS cloud computing you will need to set you inbound rules in a way that let you access to the ports.
Please check this post, which is valid for EC2 and RDS.
When to use Interface and Model in TypeScript / Angular
As @ThierryTemplier said for receiving data from server and also transmitting model between components (to keep intellisense list and make design time error), it's fine to use interface but I think for sending data to server (DTOs) it's better to use class to take advantages of auto mapping DTO from model.
Javascript - validation, numbers only
Match against /^\d+$/
. $
means "end of line", so any non-digit characters after the initial run of digits will cause the match to fail.
Edit:
RobG wisely suggests the more succinct /\D/.test(z)
. This operation tests the inverse of what you want. It returns true
if the input has any non-numeric characters.
Simply omit the negating !
and use if(/\D/.test(z))
.
How do I set the default locale in the JVM?
From the Oracle Reference:
The default locale of your application is determined in three ways.
First, unless you have explicitly changed the default, the
Locale.getDefault()
method returns the locale that was initially determined
by the Java Virtual Machine (JVM) when it first loaded. That is, the
JVM determines the default locale from the host environment. The host
environment's locale is determined by the host operating system and
the user preferences established on that system.
Second, on some Java runtime implementations, the application user can
override the host's default locale by providing this information on
the command line by setting the user.language
, user.country
, and
user.variant
system properties.
Third, your application can call the Locale.setDefault(Locale)
method. The setDefault(Locale aLocale) method lets your application
set a systemwide (actually VM-wide) resource. After you set the default locale with this
method, subsequent calls to Locale.getDefault() will return the newly
set locale.
How to right-align and justify-align in Markdown?
As mentioned here, markdown do not support right aligned text or blocks. But the HTML result does it, via Cascading Style Sheets (CSS).
On my Jekyll Blog is use a syntax which works in markdown as well. To "terminate" a block use two spaces at the end or two times new line.
Of course you can also add a css-class with {: .right }
instead of {: style="text-align: right" }
.
Text to right
{: style="text-align: right" }
This text is on the right
Text as block
{: style="text-align: justify" }
This text is a block
jquery .html() vs .append()
if by .add
you mean .append
, then the result is the same if #myDiv
is empty.
is the performance the same? dont know.
.html(x)
ends up doing the same thing as .empty().append(x)
How can I get the external SD card path for Android 4.0+?
I am sure this code will surely resolve your issues...This is working fine for me...\
try {
File mountFile = new File("/proc/mounts");
usbFoundCount=0;
sdcardFoundCount=0;
if(mountFile.exists())
{
Scanner usbscanner = new Scanner(mountFile);
while (usbscanner.hasNext()) {
String line = usbscanner.nextLine();
if (line.startsWith("/dev/fuse /storage/usbcard1")) {
usbFoundCount=1;
Log.i("-----USB--------","USB Connected and properly mounted---/dev/fuse /storage/usbcard1" );
}
}
}
if(mountFile.exists()){
Scanner sdcardscanner = new Scanner(mountFile);
while (sdcardscanner.hasNext()) {
String line = sdcardscanner.nextLine();
if (line.startsWith("/dev/fuse /storage/sdcard1")) {
sdcardFoundCount=1;
Log.i("-----USB--------","USB Connected and properly mounted---/dev/fuse /storage/sdcard1" );
}
}
}
if(usbFoundCount==1)
{
Toast.makeText(context,"USB Connected and properly mounted", 7000).show();
Log.i("-----USB--------","USB Connected and properly mounted" );
}
else
{
Toast.makeText(context,"USB not found!!!!", 7000).show();
Log.i("-----USB--------","USB not found!!!!" );
}
if(sdcardFoundCount==1)
{
Toast.makeText(context,"SDCard Connected and properly mounted", 7000).show();
Log.i("-----SDCard--------","SDCard Connected and properly mounted" );
}
else
{
Toast.makeText(context,"SDCard not found!!!!", 7000).show();
Log.i("-----SDCard--------","SDCard not found!!!!" );
}
}catch (Exception e) {
e.printStackTrace();
}
Username and password in https url
When you put the username and password in front of the host, this data is not sent that way to the server. It is instead transformed to a request header depending on the authentication schema used. Most of the time this is going to be Basic Auth which I describe below. A similar (but significantly less often used) authentication scheme is Digest Auth which nowadays provides comparable security features.
With Basic Auth, the HTTP request from the question will look something like this:
GET / HTTP/1.1
Host: example.com
Authorization: Basic Zm9vOnBhc3N3b3Jk
The hash like string you see there is created by the browser like this: base64_encode(username + ":" + password)
.
To outsiders of the HTTPS transfer, this information is hidden (as everything else on the HTTP level). You should take care of logging on the client and all intermediate servers though. The username will normally be shown in server logs, but the password won't. This is not guaranteed though. When you call that URL on the client with e.g. curl
, the username and password will be clearly visible on the process list and might turn up in the bash history file.
When you send passwords in a GET request as e.g. http://example.com/login.php?username=me&password=secure the username and password will always turn up in server logs of your webserver, application server, caches, ... unless you specifically configure your servers to not log it. This only applies to servers being able to read the unencrypted http data, like your application server or any middleboxes such as loadbalancers, CDNs, proxies, etc. though.
Basic auth is standardized and implemented by browsers by showing this little username/password popup you might have seen already. When you put the username/password into an HTML form sent via GET or POST, you have to implement all the login/logout logic yourself (which might be an advantage and allows you to more control over the login/logout flow for the added "cost" of having to implement this securely again). But you should never transfer usernames and passwords by GET parameters. If you have to, use POST instead. The prevents the logging of this data by default.
When implementing an authentication mechanism with a user/password entry form and a subsequent cookie-based session as it is commonly used today, you have to make sure that the password is either transported with POST requests or one of the standardized authentication schemes above only.
Concluding I could say, that transfering data that way over HTTPS is likely safe, as long as you take care that the password does not turn up in unexpected places. But that advice applies to every transfer of any password in any way.
Getting raw SQL query string from PDO prepared statements
A bit late probably but now there is PDOStatement::debugDumpParams
Dumps the informations contained by a prepared statement directly on
the output. It will provide the SQL query in use, the number of
parameters used (Params), the list of parameters, with their name,
type (paramtype) as an integer, their key name or position, and the
position in the query (if this is supported by the PDO driver,
otherwise, it will be -1).
You can find more on the official php docs
Example:
<?php
/* Execute a prepared statement by binding PHP variables */
$calories = 150;
$colour = 'red';
$sth = $dbh->prepare('SELECT name, colour, calories
FROM fruit
WHERE calories < :calories AND colour = :colour');
$sth->bindParam(':calories', $calories, PDO::PARAM_INT);
$sth->bindValue(':colour', $colour, PDO::PARAM_STR, 12);
$sth->execute();
$sth->debugDumpParams();
?>
<strong> vs. font-weight:bold & <em> vs. font-style:italic
HTML represents meaning; CSS represents appearance. How you mark up text in a document is not determined by how that text appears on screen, but simply what it means. As another example, some other HTML elements, like headings, are styled font-weight: bold
by default, but they are marked up using <h1>
–<h6>
, not <strong>
or <b>
.
In HTML5, you use <strong>
to indicate important parts of a sentence, for example:
<p><strong>Do not touch.</strong> Contains <strong>hazardous</strong> materials.
And you use <em>
to indicate linguistic stress, for example:
<p>A Gentleman: I suppose he does. But there's no point in asking.
<p>A Lady: Why not?
<p>A Gentleman: Because he doesn't row.
<p>A Lady: He doesn't <em>row</em>?
<p>A Gentleman: No. He <em>doesn't</em> row.
<p>A Lady: Ah. I see what you mean.
These elements are semantic elements that just happen to have bold and italic representations by default, but you can style them however you like. For example, in the <em>
sample above, you could represent stress emphasis in uppercase instead of italics, but the functional purpose of the <em>
element remains the same — to change the context of a sentence by emphasizing specific words or phrases over others:
em {
font-style: normal;
text-transform: uppercase;
}
Note that the original answer (below) applied to HTML standards prior to HTML5, in which <strong>
and <em>
had somewhat different meanings, <b>
and <i>
were purely presentational and had no semantic meaning whatsoever. Like <strong>
and <em>
respectively, they have similar presentational defaults but may be styled differently.
You use <strong>
and <em>
to indicate intense emphasis and normal emphasis respectively.
Or think of it this way: font-weight: bold
is closer to <b>
than <strong>
, and font-style: italic
is closer to <i>
than <em>
. These visual styles are purely visual: tools like screen readers aren't going to understand what bold and italic mean, but some screen readers are able to read <strong>
and <em>
text in a more emphasized tone.
Best way to work with dates in Android SQLite
You can use a text field to store dates within SQLite
.
Storing dates in UTC format, the default if you use datetime('now')
(yyyy-MM-dd HH:mm:ss)
will then allow sorting by the date column.
Retrieving dates as strings from SQLite
you can then format/convert them as required into local regionalised formats using the Calendar or the android.text.format.DateUtils.formatDateTime
method.
Here's a regionalised formatter method I use;
public static String formatDateTime(Context context, String timeToFormat) {
String finalDateTime = "";
SimpleDateFormat iso8601Format = new SimpleDateFormat(
"yyyy-MM-dd HH:mm:ss");
Date date = null;
if (timeToFormat != null) {
try {
date = iso8601Format.parse(timeToFormat);
} catch (ParseException e) {
date = null;
}
if (date != null) {
long when = date.getTime();
int flags = 0;
flags |= android.text.format.DateUtils.FORMAT_SHOW_TIME;
flags |= android.text.format.DateUtils.FORMAT_SHOW_DATE;
flags |= android.text.format.DateUtils.FORMAT_ABBREV_MONTH;
flags |= android.text.format.DateUtils.FORMAT_SHOW_YEAR;
finalDateTime = android.text.format.DateUtils.formatDateTime(context,
when + TimeZone.getDefault().getOffset(when), flags);
}
}
return finalDateTime;
}
Java ByteBuffer to String
Just wanted to point out, it's not safe to assume ByteBuffer.array() will always work.
byte[] bytes;
if(buffer.hasArray()) {
bytes = buffer.array();
} else {
bytes = new byte[buffer.remaining()];
buffer.get(bytes);
}
String v = new String(bytes, charset);
Usually buffer.hasArray() will always be true or false depending on your use case. In practice, unless you really want it to work under any circumstances, it's safe to optimize away the branch you don't need. But the rest of the answers may not work with a ByteBuffer that's been created through ByteBuffer.allocateDirect().
How to add items to a spinner in Android?
An easier way is to use the material spinner library: https://github.com/jaredrummler/MaterialSpinner
first add to your project:
compile 'com.jaredrummler:material-spinner:1.2.4'
and use like this:
<com.jaredrummler.materialspinner.MaterialSpinner
android:id="@+id/spinner"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
and java code that you can add items in java so easy:
MaterialSpinner spinner = (MaterialSpinner) findViewById(R.id.spinner);
spinner.setItems("item 1", "item 2", "item 3", "item 4", "item 5");
spinner.setOnItemSelectedListener(new MaterialSpinner.OnItemSelectedListener<String>() {
@Override public void onItemSelected(MaterialSpinner view, int position, long id, String item) {
Snackbar.make(view, "Clicked " + item, Snackbar.LENGTH_LONG).show();
}
});
Arrays.fill with multidimensional array in Java
In simple words java donot provide such an API.
You need to iterate through loop and using fill method you can fill 2D array with one loop.
int row = 5;
int col = 6;
int cache[][]=new int[row][col];
for(int i=0;i<=row;i++){
Arrays.fill(cache[i]);
}
7-zip commandline
try this one. it worked for me.
7z.exe a d:\newFileName.7z "d:\ExistingFile.txt"
open cmd and if you have installed 7zip app then try this.
on command prompt it will like c:\programs and files\7zip\7z.exe a d:\newFileName.7z "d:\ExistingFile.txt"
ansible : how to pass multiple commands
I faced the same issue. In my case, part of my variables were in a dictionary i.e. with_dict variable (looping) and I had to run 3 commands on each item.key. This solution is more relevant where you have to use with_dict dictionary with running multiple commands (without requiring with_items)
Using with_dict and with_items in one task didn't help as it was not resolving the variables.
My task was like:
- name: Make install git source
command: "{{ item }}"
with_items:
- cd {{ tools_dir }}/{{ item.value.artifact_dir }}
- make prefix={{ tools_dir }}/{{ item.value.artifact_dir }} all
- make prefix={{ tools_dir }}/{{ item.value.artifact_dir }} install
with_dict: "{{ git_versions }}"
roles/git/defaults/main.yml was:
---
tool: git
default_git: git_2_6_3
git_versions:
git_2_6_3:
git_tar_name: git-2.6.3.tar.gz
git_tar_dir: git-2.6.3
git_tar_url: https://www.kernel.org/pub/software/scm/git/git-2.6.3.tar.gz
The above resulted in an error similar to the following for each {{ item }} (for 3 commands as mentioned above). As you see, the values of tools_dir is not populated (tools_dir is a variable which is defined in a common role's defaults/main.yml and also item.value.git_tar_dir value was not populated/resolved).
failed: [server01.poc.jenkins] => (item=cd {# tools_dir #}/{# item.value.git_tar_dir #}) => {"cmd": "cd '{#' tools_dir '#}/{#' item.value.git_tar_dir '#}'", "failed": true, "item": "cd {# tools_dir #}/{# item.value.git_tar_dir #}", "rc": 2}
msg: [Errno 2] No such file or directory
Solution was easy. Instead of using "COMMAND" module in Ansible, I used "Shell" module and created a a variable in roles/git/defaults/main.yml
So, now roles/git/defaults/main.yml looks like:
---
tool: git
default_git: git_2_6_3
git_versions:
git_2_6_3:
git_tar_name: git-2.6.3.tar.gz
git_tar_dir: git-2.6.3
git_tar_url: https://www.kernel.org/pub/software/scm/git/git-2.6.3.tar.gz
#git_pre_requisites_install_cmds: "cd {{ tools_dir }}/{{ item.value.git_tar_dir }} && make prefix={{ tools_dir }}/{{ item.value.git_tar_dir }} all && make prefix={{ tools_dir }}/{{ item.value.git_tar_dir }} install"
#or use this if you want git installation to work in ~/tools/git-x.x.x
git_pre_requisites_install_cmds: "cd {{ tools_dir }}/{{ item.value.git_tar_dir }} && make prefix=`pwd` all && make prefix=`pwd` install"
#or use this if you want git installation to use the default prefix during make
#git_pre_requisites_install_cmds: "cd {{ tools_dir }}/{{ item.value.git_tar_dir }} && make all && make install"
and the task roles/git/tasks/main.yml looks like:
- name: Make install from git source
shell: "{{ git_pre_requisites_install_cmds }}"
become_user: "{{ build_user }}"
with_dict: "{{ git_versions }}"
tags:
- koba
This time, the values got successfully substituted as the module was "SHELL" and ansible output echoed the correct values. This didn't require with_items: loop.
"cmd": "cd ~/tools/git-2.6.3 && make prefix=/home/giga/tools/git-2.6.3 all && make prefix=/home/giga/tools/git-2.6.3 install",
How to increase size of DOSBox window?
Here's how to change the dosbox.conf file in Linux to increase the size of the window. I actually DID what follows, so I can say it works (in 32-bit PCLinuxOS fullmontyKDE, anyway). The question's answer is in the .conf file itself.
You find this file in Linux at /home/(username)/.dosbox . In Konqueror or Dolphin, you must first check 'Hidden files' or you won't see the folder. Open it with KWrite superuser or your fav editor.
- Save the file with another name like 'dosbox-0.74original.conf' to preserve the original file in case you need to restore it.
- Search on 'resolution' and carefully read what the conf file says about changing it. There are essentially two variables: resolution and output. You want to leave fullresolution alone for now. Your question was about WINDOW, not full. So look for windowresolution, see what the comments in conf file say you can do. The best suggestion is to use a bigger-window resolution like 900x800 (which is what I used on a 1366x768 screen), but NOT the actual resolution of your machine (which would make the window fullscreen, and you said you didn't want that). Be specific, replacing the 'windowresolution=original' with 'windowresolution=900x800' or other dimensions. On my screen, that doubled the window size just as it does with the max Font tab in Windows Properties (for the exe file; as you'll see below the ==== marks, 32-bit Windows doesn't need Dosbox).
Then, search on 'output', and as the instruction in the conf file warns, if and only if you have 'hardware scaling', change the default 'output=surface' to something else; he then lists the optional other settings. I changed it to 'output=overlay'. There's one other setting to test: aspect. Search the file for 'aspect', and change the 'false' to 'true' if you want an even bigger window. When I did this, the window took up over half of the screen. With 'false' left alone, I had a somewhat smaller window (I use widescreen monitors, whether laptop or desktop, maybe that's why).
So after you've made the changes, save the file with the original name of dosbox-0.74.conf . Then, type dosbox at the command line or create a Launcher (in KDE, this is a right click on the desktop) with the command dosbox. You still have to go through the mount command (i.e., mount c~ c:\123 if that's the location and file you'll execute). I'm sure there's a way to make a script, but haven't yet learned how to do that.
How to define static constant in a class in swift
If you actually want a static property of your class, that isn't currently supported in Swift. The current advice is to get around that by using global constants:
let testStr = "test"
let testStrLen = countElements(testStr)
class MyClass {
func myFunc() {
}
}
If you want these to be instance properties instead, you can use a lazy stored property for the length -- it will only get evaluated the first time it is accessed, so you won't be computing it over and over.
class MyClass {
let testStr: String = "test"
lazy var testStrLen: Int = countElements(self.testStr)
func myFunc() {
}
}
C++ Loop through Map
The value_type
of a map
is a pair
containing the key and value as it's first
and second
member, respectively.
map<string, int>::iterator it;
for (it = symbolTable.begin(); it != symbolTable.end(); it++)
{
std::cout << it->first << ' ' << it->second << '\n';
}
Or with C++11, using range-based for:
for (auto const& p : symbolTable)
{
std::cout << p.first << ' ' << p.second << '\n';
}
tell pip to install the dependencies of packages listed in a requirement file
Any way to do this without manually re-installing the packages in a new virtualenv to get their dependencies ? This would be error-prone and I'd like to automate the process of cleaning the virtualenv from no-longer-needed old dependencies.
That's what pip-tools package is for (from https://github.com/jazzband/pip-tools):
Installation
$ pip install --upgrade pip # pip-tools needs pip==6.1 or higher (!)
$ pip install pip-tools
Example usage for pip-compile
Suppose you have a Flask project, and want to pin it for production. Write the following line to a file:
# requirements.in
Flask
Now, run pip-compile requirements.in:
$ pip-compile requirements.in
#
# This file is autogenerated by pip-compile
# Make changes in requirements.in, then run this to update:
#
# pip-compile requirements.in
#
flask==0.10.1
itsdangerous==0.24 # via flask
jinja2==2.7.3 # via flask
markupsafe==0.23 # via jinja2
werkzeug==0.10.4 # via flask
And it will produce your requirements.txt
, with all the Flask dependencies (and all underlying dependencies) pinned. Put this file under version control as well and periodically re-run pip-compile
to update the packages.
Example usage for pip-sync
Now that you have a requirements.txt
, you can use pip-sync
to update your virtual env to reflect exactly what's in there. Note: this will install/upgrade/uninstall everything necessary to match the requirements.txt
contents.
$ pip-sync
Uninstalling flake8-2.4.1:
Successfully uninstalled flake8-2.4.1
Collecting click==4.1
Downloading click-4.1-py2.py3-none-any.whl (62kB)
100% |¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦| 65kB 1.8MB/s
Found existing installation: click 4.0
Uninstalling click-4.0:
Successfully uninstalled click-4.0
Successfully installed click-4.1
How to make canvas responsive
extending accepted answer with jquery
what if you want to add more canvas?, this jquery.each answer it
responsiveCanvas(); //first init
$(window).resize(function(){
responsiveCanvas(); //every resizing
stage.update(); //update the canvas, stage is object of easeljs
});
function responsiveCanvas(target){
$(canvas).each(function(e){
var parentWidth = $(this).parent().outerWidth();
var parentHeight = $(this).parent().outerHeight();
$(this).attr('width', parentWidth);
$(this).attr('height', parentHeight);
console.log(parentWidth);
})
}
it will do all the job for you
why we dont set the width
or the height
via css or style? because it will stretch your canvas instead of make it into expecting size
Python circular importing?
For those of you who, like me, come to this issue from Django, you should know that the docs provide a solution:
https://docs.djangoproject.com/en/1.10/ref/models/fields/#foreignkey
"...To refer to models defined in another application, you can explicitly specify a model with the full application label. For example, if the Manufacturer model above is defined in another application called production, you’d need to use:
class Car(models.Model):
manufacturer = models.ForeignKey(
'production.Manufacturer',
on_delete=models.CASCADE,
)
This sort of reference can be useful when resolving circular import dependencies between two applications...."
Validation for 10 digit mobile number and focus input field on invalid
After testing all answers without success. Some times input take alpha character also.
Here is the last full working code with only numbers input also keeping in mind backspace button key event for user if something number is incorrect.
_x000D_
_x000D_
$("#phone").keydown(function(event) {_x000D_
k = event.which;_x000D_
if ((k >= 96 && k <= 105) || k == 8) {_x000D_
if ($(this).val().length == 10) {_x000D_
if (k == 8) {_x000D_
return true;_x000D_
} else {_x000D_
event.preventDefault();_x000D_
return false;_x000D_
_x000D_
}_x000D_
}_x000D_
} else {_x000D_
event.preventDefault();_x000D_
return false;_x000D_
}_x000D_
_x000D_
});
_x000D_
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>_x000D_
<input name="phone" id="phone" placeholder="Mobile Number" class="form-control" type="number" required>
_x000D_
_x000D_
_x000D_
Go test string contains substring
To compare, there are more options:
import (
"fmt"
"regexp"
"strings"
)
const (
str = "something"
substr = "some"
)
// 1. Contains
res := strings.Contains(str, substr)
fmt.Println(res) // true
// 2. Index: check the index of the first instance of substr in str, or -1 if substr is not present
i := strings.Index(str, substr)
fmt.Println(i) // 0
// 3. Split by substr and check len of the slice, or length is 1 if substr is not present
ss := strings.Split(str, substr)
fmt.Println(len(ss)) // 2
// 4. Check number of non-overlapping instances of substr in str
c := strings.Count(str, substr)
fmt.Println(c) // 1
// 5. RegExp
matched, _ := regexp.MatchString(substr, str)
fmt.Println(matched) // true
// 6. Compiled RegExp
re = regexp.MustCompile(substr)
res = re.MatchString(str)
fmt.Println(res) // true
Benchmarks:
Contains
internally calls Index
, so the speed is almost the same (btw Go 1.11.5 showed a bit bigger difference than on Go 1.14.3).
BenchmarkStringsContains-4 100000000 10.5 ns/op 0 B/op 0 allocs/op
BenchmarkStringsIndex-4 117090943 10.1 ns/op 0 B/op 0 allocs/op
BenchmarkStringsSplit-4 6958126 152 ns/op 32 B/op 1 allocs/op
BenchmarkStringsCount-4 42397729 29.1 ns/op 0 B/op 0 allocs/op
BenchmarkStringsRegExp-4 461696 2467 ns/op 1326 B/op 16 allocs/op
BenchmarkStringsRegExpCompiled-4 7109509 168 ns/op 0 B/op 0 allocs/op
Simple InputBox function
The simplest way to get an input box is with the Read-Host cmdlet and -AsSecureString parameter.
$us = Read-Host 'Enter Your User Name:' -AsSecureString
$pw = Read-Host 'Enter Your Password:' -AsSecureString
This is especially useful if you are gathering login info like my example above. If you prefer to keep the variables obfuscated as SecureString objects you can convert the variables on the fly like this:
[Runtime.InteropServices.Marshal]::PtrToStringAuto([Runtime.InteropServices.Marshal]::SecureStringToBSTR($us))
[Runtime.InteropServices.Marshal]::PtrToStringAuto([Runtime.InteropServices.Marshal]::SecureStringToBSTR($pw))
If the info does not need to be secure at all you can convert it to plain text:
$user = [Runtime.InteropServices.Marshal]::PtrToStringAuto([Runtime.InteropServices.Marshal]::SecureStringToBSTR($us))
Read-Host and -AsSecureString appear to have been included in all PowerShell versions (1-6) but I do not have PowerShell 1 or 2 to ensure the commands work identically.
https://docs.microsoft.com/en-us/powershell/module/microsoft.powershell.utility/read-host?view=powershell-3.0
Add newly created specific folder to .gitignore in Git
I'm incredibly lazy. I just did a search hoping to find a shortcut to this problem but didn't get an answer so I knocked this up.
~/bin/IGNORE_ALL
#!/bin/bash
# Usage: IGNORE_ALL <commit message>
git status --porcelain | grep '^??' | cut -f2 -d' ' >> .gitignore
git commit -m "$*" .gitignore
EG: IGNORE_ALL added stat ignores
This will just append all the ignore files to your .gitignore and commit. note you might want to add annotations to the file afterwards.
How to make a progress bar
Basically its this: You have three files: Your long running PHP script, a progress bar controlled by Javascript (@SapphireSun gives an option), and a progress script. The hard part is the Progress Script; your long script must be able to report its progress without direct communication to your progress script. This can be in the form of session id's mapped to progress meters, a database, or check of whats not finished.
The process is simple:
- Execute your script and zero out progress bar
- Using AJAX, query your progress script
- Progress script must somehow check on progress
- Change the progress bar to reflect the value
- Clean up when finished
NOW() function in PHP
MySQL function NOW()
returns the current timestamp. The only way I found for PHP is using the following code.
$curr_timestamp = date('Y-m-d H:i:s');
How to convert DataSet to DataTable
A DataSet
already contains DataTables
. You can just use:
DataTable firstTable = dataSet.Tables[0];
or by name:
DataTable customerTable = dataSet.Tables["Customer"];
Note that you should have using
statements for your SQL code, to ensure the connection is disposed properly:
using (SqlConnection conn = ...)
{
// Code here...
}
How to detect DataGridView CheckBox event change?
Ben Voigt found the best solution in a comment-reply above:
private void dgvStandingOrder_CurrentCellDirtyStateChanged(object sender, EventArgs e)
{
if (dgvStandingOrder.CurrentCell is DataGridViewCheckBoxCell)
dgvStandingOrder.CommitEdit(DataGridViewDataErrorContexts.Commit);
}
Seriously, that's ALL you need.
Way to create multiline comments in Bash?
Multiline comment in bash
: <<'END_COMMENT'
This is a heredoc (<<) redirected to a NOP command (:).
The single quotes around END_COMMENT are important,
because it disables variable resolving and command resolving
within these lines. Without the single-quotes around END_COMMENT,
the following two $() `` commands would get executed:
$(gibberish command)
`rm -fr mydir`
comment1
comment2
comment3
END_COMMENT
Creating a simple login form
Check it -
You can try this code for your login form design as you ask thank you.
Explain css -
First, we define property font style and width And after that I have defined form id to set background image and the border And after that I have to define the header text in tag and after that I have added new and define by.New to set background properties and width. Thanks
Create a file index.html
<!DOCTYPE html>
<html>
<head>
<link rel="stylesheet" href="style.css">
</head>
<body>
<div id="login_form">
<div class="new"><span>enter login details</span></div>
<!-- This is your header text-->
<form name="f1" method="post" action="login.php" id="f1">
<table>
<tr>
<td class="f1_label">User Name :</td>
<!-- This is your first Input Box Label-->
<td>
<input type="text" name="username" value="" /><!-- This is your first Input Box-->
</td>
</tr>
<tr>
<td class="f1_label">Password :</td>
<!-- This is your Second Input Box Label-->
<td>
<input type="password" name="password" value="" /><!-- This is your Second Input Box -->
</td>
</tr>
<tr>
<td>
<input type="submit" name="login" value="Log In" style="font-size:18px; " /><!-- This is your submit button -->
</td>
</tr>
</table>
</form>
</div>
</body>
</html>
Create css file style.css
body {
font-style: italic;
width: 50%;
margin: 0px auto;
}
#login_form {}
#f1 {
background-color: #FFF;
border-style: solid;
border-width: 1px;
padding: 23px 1px 20px 114px;
}
.f1_label {
white-space: nowrap;
}
span {
color: white;
}
.new {
background: black;
text-align: center;
}
Select Tag Helper in ASP.NET Core MVC
Using the Select Tag helpers to render a SELECT element
In your GET action, create an object of your view model, load the EmployeeList
collection property and send that to the view.
public IActionResult Create()
{
var vm = new MyViewModel();
vm.EmployeesList = new List<Employee>
{
new Employee { Id = 1, FullName = "Shyju" },
new Employee { Id = 2, FullName = "Bryan" }
};
return View(vm);
}
And in your create view, create a new SelectList
object from the EmployeeList
property and pass that as value for the asp-items
property.
@model MyViewModel
<form asp-controller="Home" asp-action="Create">
<select asp-for="EmployeeId"
asp-items="@(new SelectList(Model.EmployeesList,"Id","FullName"))">
<option>Please select one</option>
</select>
<input type="submit"/>
</form>
And your HttpPost action method to accept the submitted form data.
[HttpPost]
public IActionResult Create(MyViewModel model)
{
// check model.EmployeeId
// to do : Save and redirect
}
Or
If your view model has a List<SelectListItem>
as the property for your dropdown items.
public class MyViewModel
{
public int EmployeeId { get; set; }
public string Comments { get; set; }
public List<SelectListItem> Employees { set; get; }
}
And in your get action,
public IActionResult Create()
{
var vm = new MyViewModel();
vm.Employees = new List<SelectListItem>
{
new SelectListItem {Text = "Shyju", Value = "1"},
new SelectListItem {Text = "Sean", Value = "2"}
};
return View(vm);
}
And in the view, you can directly use the Employees
property for the asp-items
.
@model MyViewModel
<form asp-controller="Home" asp-action="Create">
<label>Comments</label>
<input type="text" asp-for="Comments"/>
<label>Lucky Employee</label>
<select asp-for="EmployeeId" asp-items="@Model.Employees" >
<option>Please select one</option>
</select>
<input type="submit"/>
</form>
The class SelectListItem
belongs to Microsoft.AspNet.Mvc.Rendering
namespace.
Make sure you are using an explicit closing tag for the select element. If you use the self closing tag approach, the tag helper will render an empty SELECT element!
The below approach will not work
<select asp-for="EmployeeId" asp-items="@Model.Employees" />
But this will work.
<select asp-for="EmployeeId" asp-items="@Model.Employees"></select>
Getting data from your database table using entity framework
The above examples are using hard coded items for the options. So i thought i will add some sample code to get data using Entity framework as a lot of people use that.
Let's assume your DbContext object has a property called Employees
, which is of type DbSet<Employee>
where the Employee
entity class has an Id
and Name
property like this
public class Employee
{
public int Id { set; get; }
public string Name { set; get; }
}
You can use a LINQ query to get the employees and use the Select method in your LINQ expression to create a list of SelectListItem
objects for each employee.
public IActionResult Create()
{
var vm = new MyViewModel();
vm.Employees = context.Employees
.Select(a => new SelectListItem() {
Value = a.Id.ToString(),
Text = a.Name
})
.ToList();
return View(vm);
}
Assuming context
is your db context object. The view code is same as above.
Using SelectList
Some people prefer to use SelectList
class to hold the items needed to render the options.
public class MyViewModel
{
public int EmployeeId { get; set; }
public SelectList Employees { set; get; }
}
Now in your GET action, you can use the SelectList
constructor to populate the Employees
property of the view model. Make sure you are specifying the dataValueField
and dataTextField
parameters.
public IActionResult Create()
{
var vm = new MyViewModel();
vm.Employees = new SelectList(GetEmployees(),"Id","FirstName");
return View(vm);
}
public IEnumerable<Employee> GetEmployees()
{
// hard coded list for demo.
// You may replace with real data from database to create Employee objects
return new List<Employee>
{
new Employee { Id = 1, FirstName = "Shyju" },
new Employee { Id = 2, FirstName = "Bryan" }
};
}
Here I am calling the GetEmployees
method to get a list of Employee objects, each with an Id
and FirstName
property and I use those properties as DataValueField
and DataTextField
of the SelectList
object we created. You can change the hardcoded list to a code which reads data from a database table.
The view code will be same.
<select asp-for="EmployeeId" asp-items="@Model.Employees" >
<option>Please select one</option>
</select>
Render a SELECT element from a list of strings.
Sometimes you might want to render a select element from a list of strings. In that case, you can use the SelectList
constructor which only takes IEnumerable<T>
var vm = new MyViewModel();
var items = new List<string> {"Monday", "Tuesday", "Wednesday"};
vm.Employees = new SelectList(items);
return View(vm);
The view code will be same.
Setting selected options
Some times,you might want to set one option as the default option in the SELECT element (For example, in an edit screen, you want to load the previously saved option value). To do that, you may simply set the EmployeeId
property value to the value of the option you want to be selected.
public IActionResult Create()
{
var vm = new MyViewModel();
vm.Employees = new List<SelectListItem>
{
new SelectListItem {Text = "Shyju", Value = "11"},
new SelectListItem {Text = "Tom", Value = "12"},
new SelectListItem {Text = "Jerry", Value = "13"}
};
vm.EmployeeId = 12; // Here you set the value
return View(vm);
}
This will select the option Tom in the select element when the page is rendered.
Multi select dropdown
If you want to render a multi select dropdown, you can simply change your view model property which you use for asp-for
attribute in your view to an array type.
public class MyViewModel
{
public int[] EmployeeIds { get; set; }
public List<SelectListItem> Employees { set; get; }
}
This will render the HTML markup for the select element with the multiple
attribute which will allow the user to select multiple options.
@model MyViewModel
<select id="EmployeeIds" multiple="multiple" name="EmployeeIds">
<option>Please select one</option>
<option value="1">Shyju</option>
<option value="2">Sean</option>
</select>
Setting selected options in multi select
Similar to single select, set the EmployeeIds
property value to the an array of values you want.
public IActionResult Create()
{
var vm = new MyViewModel();
vm.Employees = new List<SelectListItem>
{
new SelectListItem {Text = "Shyju", Value = "11"},
new SelectListItem {Text = "Tom", Value = "12"},
new SelectListItem {Text = "Jerry", Value = "13"}
};
vm.EmployeeIds= new int[] { 12,13} ;
return View(vm);
}
This will select the option Tom and Jerry in the multi select element when the page is rendered.
Using ViewBag to transfer the list of items
If you do not prefer to keep a collection type property to pass the list of options to the view, you can use the dynamic ViewBag to do so.(This is not my personally recommended approach as viewbag is dynamic and your code is prone to uncatched typo errors)
public IActionResult Create()
{
ViewBag.Employees = new List<SelectListItem>
{
new SelectListItem {Text = "Shyju", Value = "1"},
new SelectListItem {Text = "Sean", Value = "2"}
};
return View(new MyViewModel());
}
and in the view
<select asp-for="EmployeeId" asp-items="@ViewBag.Employees">
<option>Please select one</option>
</select>
Using ViewBag to transfer the list of items and setting selected option
It is same as above. All you have to do is, set the property (for which you are binding the dropdown for) value to the value of the option you want to be selected.
public IActionResult Create()
{
ViewBag.Employees = new List<SelectListItem>
{
new SelectListItem {Text = "Shyju", Value = "1"},
new SelectListItem {Text = "Bryan", Value = "2"},
new SelectListItem {Text = "Sean", Value = "3"}
};
vm.EmployeeId = 2; // This will set Bryan as selected
return View(new MyViewModel());
}
and in the view
<select asp-for="EmployeeId" asp-items="@ViewBag.Employees">
<option>Please select one</option>
</select>
Grouping items
The select tag helper method supports grouping options in a dropdown. All you have to do is, specify the Group
property value of each SelectListItem
in your action method.
public IActionResult Create()
{
var vm = new MyViewModel();
var group1 = new SelectListGroup { Name = "Dev Team" };
var group2 = new SelectListGroup { Name = "QA Team" };
var employeeList = new List<SelectListItem>()
{
new SelectListItem() { Value = "1", Text = "Shyju", Group = group1 },
new SelectListItem() { Value = "2", Text = "Bryan", Group = group1 },
new SelectListItem() { Value = "3", Text = "Kevin", Group = group2 },
new SelectListItem() { Value = "4", Text = "Alex", Group = group2 }
};
vm.Employees = employeeList;
return View(vm);
}
There is no change in the view code. the select tag helper will now render the options inside 2 optgroup items.
req.query and req.param in ExpressJS
req.query
will return a JS object after the query string is parsed.
/user?name=tom&age=55 - req.query
would yield {name:"tom", age: "55"}
req.params
will return parameters in the matched route.
If your route is /user/:id and you make a request to /user/5 - req.params
would yield {id: "5"}
req.param
is a function that peels parameters out of the request. All of this can be found here.
UPDATE
If the verb is a POST
and you are using bodyParser
, then you should be able to get the form body in you function with req.body
. That will be the parsed JS version of the POST
ed form.
How to get the current time in milliseconds from C in Linux?
This version need not math library and checked the return value of clock_gettime().
#include <time.h>
#include <stdlib.h>
#include <stdint.h>
/**
* @return milliseconds
*/
uint64_t get_now_time() {
struct timespec spec;
if (clock_gettime(1, &spec) == -1) { /* 1 is CLOCK_MONOTONIC */
abort();
}
return spec.tv_sec * 1000 + spec.tv_nsec / 1e6;
}
Java String to SHA1
SHA-1 (and all other hashing algorithms) return binary data. That means that (in Java) they produce a byte[]
. That byte
array does not represent any specific characters, which means you can't simply turn it into a String
like you did.
If you need a String
, then you have to format that byte[]
in a way that can be represented as a String
(otherwise, just keep the byte[]
around).
Two common ways of representing arbitrary byte[]
as printable characters are BASE64 or simple hex-Strings (i.e. representing each byte
by two hexadecimal digits). It looks like you're trying to produce a hex-String.
There's also another pitfall: if you want to get the SHA-1 of a Java String
, then you need to convert that String
to a byte[]
first (as the input of SHA-1 is a byte[]
as well). If you simply use myString.getBytes()
as you showed, then it will use the platform default encoding and as such will be dependent on the environment you run it in (for example it could return different data based on the language/locale setting of your OS).
A better solution is to specify the encoding to use for the String
-to-byte[]
conversion like this: myString.getBytes("UTF-8")
. Choosing UTF-8 (or another encoding that can represent every Unicode character) is the safest choice here.
Have a fixed position div that needs to scroll if content overflows
Leaving an answer for anyone looking to do something similar but in a horizontal direction, like I wanted to.
Tweaking @strider820's answer like below will do the magic:
.fixed-content { //comments showing what I replaced.
left:0; //top: 0;
right:0; //bottom:0;
position:fixed;
overflow-y:hidden; //overflow-y:scroll;
overflow-x:auto; //overflow-x:hidden;
}
That's it. Also check this comment where @train explained using overflow:auto
over overflow:scroll
.
Difference between git pull and git pull --rebase
Sometimes we have an upstream that rebased/rewound a branch we're depending on. This can be a big problem -- causing messy conflicts for us if we're downstream.
The magic is git pull --rebase
A normal git pull is, loosely speaking, something like this (we'll use a remote called origin and a branch called foo in all these examples):
# assume current checked out branch is "foo"
git fetch origin
git merge origin/foo
At first glance, you might think that a git pull --rebase does just this:
git fetch origin
git rebase origin/foo
But that will not help if the upstream rebase involved any "squashing" (meaning that the patch-ids of the commits changed, not just their order).
Which means git pull --rebase has to do a little bit more than that. Here's an explanation of what it does and how.
Let's say your starting point is this:
a---b---c---d---e (origin/foo) (also your local "foo")
Time passes, and you have made some commits on top of your own "foo":
a---b---c---d---e---p---q---r (foo)
Meanwhile, in a fit of anti-social rage, the upstream maintainer has not only rebased his "foo", he even used a squash or two. His commit chain now looks like this:
a---b+c---d+e---f (origin/foo)
A git pull at this point would result in chaos. Even a git fetch; git rebase origin/foo would not cut it, because commits "b" and "c" on one side, and commit "b+c" on the other, would conflict. (And similarly with d, e, and d+e).
What git pull --rebase
does, in this case, is:
git fetch origin
git rebase --onto origin/foo e foo
This gives you:
a---b+c---d+e---f---p'---q'---r' (foo)
You may still get conflicts, but they will be genuine conflicts (between p/q/r and a/b+c/d+e/f), and not conflicts caused by b/c conflicting with b+c, etc.
Answer taken from (and slightly modified):
http://gitolite.com/git-pull--rebase
What is a magic number, and why is it bad?
In programming, a "magic number" is a value that should be given a symbolic name, but was instead slipped into the code as a literal, usually in more than one place.
It's bad for the same reason SPOT (Single Point of Truth) is good: If you wanted to change this constant later, you would have to hunt through your code to find every instance. It is also bad because it might not be clear to other programmers what this number represents, hence the "magic".
People sometimes take magic number elimination further, by moving these constants into separate files to act as configuration. This is sometimes helpful, but can also create more complexity than it's worth.
How to launch PowerShell (not a script) from the command line
The color and window sizing are defined by the shortcut LNK file. I think I found a way that will do what you need, try this:
explorer.exe "Windows PowerShell.lnk"
The LNK file is in the all user start menu which is located in different places depending whether your on XP or Windows 7. In 7 the LNK file is here:
C:\ProgramData\Microsoft\Windows\Start Menu\Programs\Accessories\Windows PowerShell
Delete last char of string
What about doing it this way
strgroupids = string.Join( ",", groupIds );
A lot cleaner.
It will append all elements inside groupIds
with a ','
between each, but it will not put a ','
at the end.
Is it possible to capture the stdout from the sh DSL command in the pipeline
Now, the sh
step supports returning stdout by supplying the parameter returnStdout
.
// These should all be performed at the point where you've
// checked out your sources on the slave. A 'git' executable
// must be available.
// Most typical, if you're not cloning into a sub directory
gitCommit = sh(returnStdout: true, script: 'git rev-parse HEAD').trim()
// short SHA, possibly better for chat notifications, etc.
shortCommit = gitCommit.take(6)
See this example.
How to manually set an authenticated user in Spring Security / SpringMVC
I had the same problem as you a while back. I can't remember the details but the following code got things working for me. This code is used within a Spring Webflow flow, hence the RequestContext and ExternalContext classes. But the part that is most relevant to you is the doAutoLogin method.
public String registerUser(UserRegistrationFormBean userRegistrationFormBean,
RequestContext requestContext,
ExternalContext externalContext) {
try {
Locale userLocale = requestContext.getExternalContext().getLocale();
this.userService.createNewUser(userRegistrationFormBean, userLocale, Constants.SYSTEM_USER_ID);
String emailAddress = userRegistrationFormBean.getChooseEmailAddressFormBean().getEmailAddress();
String password = userRegistrationFormBean.getChoosePasswordFormBean().getPassword();
doAutoLogin(emailAddress, password, (HttpServletRequest) externalContext.getNativeRequest());
return "success";
} catch (EmailAddressNotUniqueException e) {
MessageResolver messageResolvable
= new MessageBuilder().error()
.source(UserRegistrationFormBean.PROPERTYNAME_EMAIL_ADDRESS)
.code("userRegistration.emailAddress.not.unique")
.build();
requestContext.getMessageContext().addMessage(messageResolvable);
return "error";
}
}
private void doAutoLogin(String username, String password, HttpServletRequest request) {
try {
// Must be called from request filtered by Spring Security, otherwise SecurityContextHolder is not updated
UsernamePasswordAuthenticationToken token = new UsernamePasswordAuthenticationToken(username, password);
token.setDetails(new WebAuthenticationDetails(request));
Authentication authentication = this.authenticationProvider.authenticate(token);
logger.debug("Logging in with [{}]", authentication.getPrincipal());
SecurityContextHolder.getContext().setAuthentication(authentication);
} catch (Exception e) {
SecurityContextHolder.getContext().setAuthentication(null);
logger.error("Failure in autoLogin", e);
}
}
Take multiple lists into dataframe
I think you're almost there, try removing the extra square brackets around the lst
's (Also you don't need to specify the column names when you're creating a dataframe from a dict like this):
import pandas as pd
lst1 = range(100)
lst2 = range(100)
lst3 = range(100)
percentile_list = pd.DataFrame(
{'lst1Title': lst1,
'lst2Title': lst2,
'lst3Title': lst3
})
percentile_list
lst1Title lst2Title lst3Title
0 0 0 0
1 1 1 1
2 2 2 2
3 3 3 3
4 4 4 4
5 5 5 5
6 6 6 6
...
If you need a more performant solution you can use np.column_stack
rather than zip
as in your first attempt, this has around a 2x speedup on the example here, however comes at bit of a cost of readability in my opinion:
import numpy as np
percentile_list = pd.DataFrame(np.column_stack([lst1, lst2, lst3]),
columns=['lst1Title', 'lst2Title', 'lst3Title'])
ListBox vs. ListView - how to choose for data binding
A ListView is a specialized ListBox (that is, it inherits from ListBox). It allows you to specify different views rather than a straight list. You can either roll your own view, or use GridView (think explorer-like "details view"). It's basically the multi-column listbox, the cousin of windows form's listview.
If you don't need the additional capabilities of ListView, you can certainly use ListBox if you're simply showing a list of items (Even if the template is complex).
How to use Bootstrap 4 in ASP.NET Core
Looking into this, it seems like the LibMan approach works best for my needs with adding Bootstrap. I like it because it is now built into Visual Studio 2017(15.8 or later) and has its own dialog boxes.
Update 6/11/2020: bootstrap 4.1.3 is now added by default with VS-2019.5 (Thanks to Harald S. Hanssen for noticing.)
The default method VS adds to projects uses Bower but it looks like it is on the way out. In the header of Microsofts bower page they write:
Following a couple links lead to Use LibMan with ASP.NET Core in Visual Studio where it shows how libs can be added using a built-in Dialog:
In Solution Explorer, right-click the project folder in which the
files should be added. Choose Add > Client-Side Library. The Add
Client-Side Library dialog appears: [source: Scott Addie 2018]
Then for bootstrap just (1) select the unpkg, (2) type in "bootstrap@.." (3) Install. After this, you would just want to verify all the includes in the _Layout.cshtml or other places are correct. They should be something like href="~/lib/bootstrap/dist/js/bootstrap...")
How can I regenerate ios folder in React Native project?
- Open Terminal/cmd
- Move to the folder/directory where the project "ProjectName" folder exist(Do not go into project directory)
- run command as: react-native init "ProjectName" and it will warn that project directory already exist but you continue.
- It will install all updated node modules as well as missing platform (android/ios) folders inside project without disturbing the code already written.
- cd "ProjectName" and then cd ios and then run pod install
PS: Take backup of your code in case it changes App.js
How to use apply a custom drawable to RadioButton?
In programmatically, add the background image
minSdkVersion 16
RadioGroup rg = new RadioGroup(this);
RadioButton radioButton = new RadioButton(this);
radioButton.setBackground(R.drawable.account_background);
rg.addView(radioButton);
How to define an enumerated type (enum) in C?
If you declare the name for enumeration no error will occur.
If not declared, you have to use a typedef
:
enum enum_name {RANDOM, IMMEDIATE, SEARCH} strategy;
strategy = IMMEDIATE;
It will not display an error...
What is initial scale, user-scalable, minimum-scale, maximum-scale attribute in meta tag?
They are viewport meta tags, and is most applicable on mobile browsers.
width=device-width
This means, we are telling to the browser “my website adapts to your device width”.
initial-scale
This defines the scale of the website, This parameter sets the initial zoom level, which means 1 CSS pixel is equal to 1 viewport pixel. This parameter help when you're changing orientation, or preventing default zooming. Without this parameter, responsive site won't work.
maximum-scale
Maximum-scale defines the maximum zoom. When you access the website, top priority is maximum-scale=1
, and it won’t allow the user to zoom.
minimum-scale
Minimum-scale defines the minimum zoom. This works the same as above, but it defines the minimum scale. This is useful, when maximum-scale
is large, and you want to set minimum-scale
.
user-scalable
User-scalable assigned to 1.0 means the website is allowing the user to zoom in or zoom out.
But if you assign it to user-scalable=no
, it means the website is not allowing the user to zoom in or zoom out.
Questions every good Java/Java EE Developer should be able to answer?
Usage of final keyword in method calls.
For example why does the method test in below code does not give any compile error despite using final qualifier for the method parameter.
class Name {
private String name;
public Name (String s) {
this.name = s;
}
public void setName(String s) {
this.name = s;
}
}
private void test (final Name n) {
n.setName("test");
}
Hash table runtime complexity (insert, search and delete)
Hash tables are O(1)
average and amortized case complexity, however it suffers from O(n)
worst case time complexity. [And I think this is where your confusion is]
Hash tables suffer from O(n)
worst time complexity due to two reasons:
- If too many elements were hashed into the same key: looking inside this key may take
O(n)
time.
- Once a hash table has passed its load balance - it has to rehash [create a new bigger table, and re-insert each element to the table].
However, it is said to be O(1)
average and amortized case because:
- It is very rare that many items will be hashed to the same key [if you chose a good hash function and you don't have too big load balance.
- The rehash operation, which is
O(n)
, can at most happen after n/2
ops, which are all assumed O(1)
: Thus when you sum the average time per op, you get : (n*O(1) + O(n)) / n) = O(1)
Note because of the rehashing issue - a realtime applications and applications that need low latency - should not use a hash table as their data structure.
EDIT: Annother issue with hash tables: cache
Another issue where you might see a performance loss in large hash tables is due to cache performance. Hash Tables suffer from bad cache performance, and thus for large collection - the access time might take longer, since you need to reload the relevant part of the table from the memory back into the cache.
How can I select an element in a component template?
import { Component, ElementRef, OnInit } from '@angular/core';
@Component({
selector:'display',
template:`
<input (input)="updateName($event.target.value)">
<p> My name : {{ myName }}</p>
`
})
class DisplayComponent implements OnInit {
constructor(public element: ElementRef) {
this.element.nativeElement // <- your direct element reference
}
ngOnInit() {
var el = this.element.nativeElement;
console.log(el);
}
updateName(value) {
// ...
}
}
Example updated to work with the latest version
For more details on native element, here
Correct use for angular-translate in controllers
To make a translation in the controller you could use $translate
service:
$translate(['COMMON.SI', 'COMMON.NO']).then(function (translations) {
vm.si = translations['COMMON.SI'];
vm.no = translations['COMMON.NO'];
});
That statement only does the translation on controller activation but it doesn't detect the runtime change in language. In order to achieve that behavior, you could listen the $rootScope
event: $translateChangeSuccess
and do the same translation there:
$rootScope.$on('$translateChangeSuccess', function () {
$translate(['COMMON.SI', 'COMMON.NO']).then(function (translations) {
vm.si = translations['COMMON.SI'];
vm.no = translations['COMMON.NO'];
});
});
Of course, you could encapsulate the $translate
service in a method and call it in the controller and in the $translateChangeSucess
listener.
Correct way of using log4net (logger naming)
Disadvantage of second approach is big repository with created loggers. This loggers do the same if root is defined and class loggers are not defined. Standard scenario on production system is using few loggers dedicated to group of class. Sorry for my English.
Convert float to double without losing precision
I find converting to the binary representation easier to grasp this problem.
float f = 0.27f;
double d2 = (double) f;
double d3 = 0.27d;
System.out.println(Integer.toBinaryString(Float.floatToRawIntBits(f)));
System.out.println(Long.toBinaryString(Double.doubleToRawLongBits(d2)));
System.out.println(Long.toBinaryString(Double.doubleToRawLongBits(d3)));
You can see the float is expanded to the double by adding 0s to the end, but that the double representation of 0.27 is 'more accurate', hence the problem.
111110100010100011110101110001
11111111010001010001111010111000100000000000000000000000000000
11111111010001010001111010111000010100011110101110000101001000
How to import an existing project from GitHub into Android Studio
In Github click the "Clone or download" button of the project you want to import --> download the ZIP file and unzip it. In Android Studio Go to File -> New Project -> Import Project and select the newly unzipped folder -> press OK. It will build the Gradle automatically.
Good Luck with your project
The listener supports no services
You need to add your ORACLE_HOME
definition in your listener.ora file. Right now its not registered with any ORACLE_HOME
.
Sample listener.ora
abc =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = abc.kma.com)(PORT = 1521))
)
)
SID_LIST_abc =
(SID_LIST =
(SID_DESC =
(ORACLE_HOME= /abc/DbTier/11.2.0)
(SID_NAME = abc)
)
)
How can I read a whole file into a string variable
I'm not with computer,so I write a draft. You might be clear of what I say.
func main(){
const dir = "/etc/"
filesInfo, e := ioutil.ReadDir(dir)
var fileNames = make([]string, 0, 10)
for i,v:=range filesInfo{
if !v.IsDir() {
fileNames = append(fileNames, v.Name())
}
}
var fileNumber = len(fileNames)
var contents = make([]string, fileNumber, 10)
wg := sync.WaitGroup{}
wg.Add(fileNumber)
for i,_:=range content {
go func(i int){
defer wg.Done()
buf,e := ioutil.Readfile(fmt.Printf("%s/%s", dir, fileName[i]))
defer file.Close()
content[i] = string(buf)
}(i)
}
wg.Wait()
}
How to convert a DataFrame back to normal RDD in pyspark?
Answer given by kennyut/Kistian works very well but to get exact RDD like output when RDD consist of list of attributes e.g. [1,2,3,4] we can use flatmap command as below,
rdd = df.rdd.flatMap(list)
or
rdd = df.rdd.flatmap(lambda x: list(x))
Display images in asp.net mvc
Make sure you image is a relative path such as:
@Url.Content("~/Content/images/myimage.png")
MVC4
<img src="~/Content/images/myimage.png" />
You could convert the byte[]
into a Base64
string
on the fly.
string base64String = Convert.ToBase64String(imageBytes);
<img src="@String.Format("data:image/png;base64,{0}", base64string)" />
How to float 3 divs side by side using CSS?
<style>
.left-column
{
float:left;
width:30%;
background-color:red;
}
.right-column
{
float:right;
width:30%;
background-color:green;
}
.center-column
{
margin:auto;
width:30%;
background-color:blue;
}
</style>
<div id="container">
<section class="left-column">THIS IS COLUMN 1 LEFT</section>
<section class="right-column">THIS IS COLUMN 3 RIGHT</section>
<section class="center-column">THIS IS COLUMN 2 CENTER</section>
</div>
the advantage of this way is you can set each column width independant of the other as long as you keep it under 100%, if you use 3 x 30% the remaining 10% is split as a 5% divider space between the collumns
How to connect to a remote Git repository?
Now, if the repository is already existing on a remote machine, and you do not have anything locally, you do git clone instead.
The URL format is simple, it is PROTOCOL:/[user@]remoteMachineAddress/path/to/repository.git
For example, cloning a repository on a machine to which you have SSH access using the "dev" user, residing in /srv/repositories/awesomeproject.git and that machine has the ip 10.11.12.13 you do:
git clone ssh://[email protected]/srv/repositories/awesomeproject.git
How do I copy the contents of a String to the clipboard in C#?
I wish calling SetText
were that easy but there are quite a few gotchas that you have to deal with. You have to make sure that the thread you are calling it on is running in the STA. It can sometimes fail with an access denied error then work seconds later without problem - something to do with the COM timing issues in the clipboard. And if your application is accessed over Remote Desktop access to the clipboard is sketchy. We use a centralized method to handle all theses scenarios instead of calling SetText
directly.
@Stecy: Here's our centralized code:
The StaHelper class simply executes some arbitrary code on a thread in the Single Thread Apartment (STA) - required by the clipboard.
abstract class StaHelper
{
readonly ManualResetEvent _complete = new ManualResetEvent( false );
public void Go()
{
var thread = new Thread( new ThreadStart( DoWork ) )
{
IsBackground = true,
}
thread.SetApartmentState( ApartmentState.STA );
thread.Start();
}
// Thread entry method
private void DoWork()
{
try
{
_complete.Reset();
Work();
}
catch( Exception ex )
{
if( DontRetryWorkOnFailed )
throw;
else
{
try
{
Thread.Sleep( 1000 );
Work();
}
catch
{
// ex from first exception
LogAndShowMessage( ex );
}
}
}
finally
{
_complete.Set();
}
}
public bool DontRetryWorkOnFailed{ get; set; }
// Implemented in base class to do actual work.
protected abstract void Work();
}
Then we have a specific class for setting text on the clipboard. Creating a DataObject
manually is required in some edge cases on some versions of Windows/.NET. I don't recall the exact scenarios now and it may not be required in .NET 3.5.
class SetClipboardHelper : StaHelper
{
readonly string _format;
readonly object _data;
public SetClipboardHelper( string format, object data )
{
_format = format;
_data = data;
}
protected override void Work()
{
var obj = new System.Windows.Forms.DataObject(
_format,
_data
);
Clipboard.SetDataObject( obj, true );
}
}
Usage looks like this:
new SetClipboardHelper( DataFormats.Text, "See, I'm on the clipboard" ).Go();
How to convert a string from uppercase to lowercase in Bash?
The correct way to implement your code is
y="HELLO"
val=$(echo "$y" | tr '[:upper:]' '[:lower:]')
string="$val world"
This uses $(...)
notation to capture the output of the command in a variable. Note also the quotation marks around the string
variable -- you need them there to indicate that $val
and world
are a single thing to be assigned to string
.
If you have bash
4.0 or higher, a more efficient & elegant way to do it is to use bash
builtin string manipulation:
y="HELLO"
string="${y,,} world"
What is the difference between T(n) and O(n)?
A chart could make the previous answers easier to understand:
T-Notation - Same order | O-Notation - Upper bound
In English,
On the left, note that there is an upper bound and a lower bound that are both of the same order of magnitude (i.e. g(n) ). Ignore the constants, and if the upper bound and lower bound have the same order of magnitude, one can validly say f(n) = T(g(n)) or f(n) is in big theta of g(n).
Starting with the right, the simpler example, it is saying the upper bound g(n) is simply the order of magnitude and ignores the constant c (just as all big O notation does).
Find files and tar them (with spaces)
Would add a comment to @Steve Kehlet post but need 50 rep (RIP).
For anyone that has found this post through numerous googling, I found a way to not only find specific files given a time range, but also NOT include the relative paths OR whitespaces that would cause tarring errors. (THANK YOU SO MUCH STEVE.)
find . -name "*.pdf" -type f -mtime 0 -printf "%f\0" | tar -czvf /dir/zip.tar.gz --null -T -
.
relative directory
-name "*.pdf"
look for pdfs (or any file type)
-type f
type to look for is a file
-mtime 0
look for files created in last 24 hours
-printf "%f\0"
Regular -print0
OR -printf "%f"
did NOT work for me. From man pages:
This quoting is performed in the same way as for GNU ls. This is not the same quoting mechanism as the one used for -ls and -fls. If you are able to decide what format to use for the output of find then it is normally better to use '\0' as a terminator than to use newline, as file names can contain white space and newline characters.
-czvf
create archive, filter the archive through gzip , verbosely list files processed, archive name
Edit 2019-08-14:
I would like to add, that I was also able to use essentially use the same command in my comment, just using tar itself:
tar -czvf /archiveDir/test.tar.gz --newer-mtime=0 --ignore-failed-read *.pdf
Needed --ignore-failed-read
in-case there were no new PDFs for today.
Microsoft Visual C++ 14.0 is required (Unable to find vcvarsall.bat)
for Python 3.7.4 following set of commands worked:
Before those command, you need to confirm Desktop with C++ and Python is installed in Visual Studio.
cd "C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Auxiliary\Build"
vcvarsall.bat x86_amd64
cd \
set CL=-FI"%VCINSTALLDIR%\tools\msvc\14.16.27023\include\stdint.h"
pip install pycrypto
Call a VBA Function into a Sub Procedure
Calling a Sub Procedure – 3 Way technique
Once you have a procedure, whether you created it or it is part of the Visual Basic language, you can use it. Using a procedure is also referred to as calling it.
Before calling a procedure, you should first locate the section of code in which you want to use it. To call a simple procedure, type its name. Here is an example:
Sub CreateCustomer()
Dim strFullName As String
strFullName = "Paul Bertrand Yamaguchi"
msgbox strFullName
End Sub
Sub Exercise()
CreateCustomer
End Sub
Besides using the name of a procedure to call it, you can also precede it with the Call keyword. Here is an example:
Sub CreateCustomer()
Dim strFullName As String
strFullName = "Paul Bertrand Yamaguchi"
End Sub
Sub Exercise()
Call CreateCustomer
End Sub
When calling a procedure, without or without the Call keyword, you can optionally type an opening and a closing parentheses on the right side of its name. Here is an example:
Sub CreateCustomer()
Dim strFullName As String
strFullName = "Paul Bertrand Yamaguchi"
End Sub
Sub Exercise()
CreateCustomer()
End Sub
Procedures and Access Levels
Like a variable access, the access to a procedure can be controlled by an access level. A procedure can be made private or public. To specify the access level of a procedure, precede it with the Private or the Public keyword. Here is an example:
Private Sub CreateCustomer()
Dim strFullName As String
strFullName = "Paul Bertrand Yamaguchi"
End Sub
The rules that were applied to global variables are the same:
Private: If a procedure is made private, it can be called by other procedures of the same module. Procedures of outside modules cannot access such a procedure.
Also, when a procedure is private, its name does not appear in the Macros dialog box
Public: A procedure created as public can be called by procedures of the same module and by procedures of other modules.
Also, if a procedure was created as public, when you access the Macros dialog box, its name appears and you can run it from there
When are you supposed to use escape instead of encodeURI / encodeURIComponent?
For the purpose of encoding javascript has given three inbuilt functions -
escape()
- does not encode @*/+
This method is deprecated after the ECMA 3 so it should be avoided.
encodeURI()
- does not encode ~!@#$&*()=:/,;?+'
It assumes that the URI is a complete URI, so does not encode reserved characters that have special meaning in the URI.
This method is used when the intent is to convert the complete URL instead of some special segment of URL.
Example - encodeURI('http://stackoverflow.com');
will give - http://stackoverflow.com
encodeURIComponent()
- does not encode - _ . ! ~ * ' ( )
This function encodes a Uniform Resource Identifier (URI) component by replacing each instance of certain characters by one, two, three, or four escape sequences representing the UTF-8 encoding of the character. This method should be used to convert a component of URL. For instance some user input needs to be appended
Example - encodeURIComponent('http://stackoverflow.com');
will give - http%3A%2F%2Fstackoverflow.com
All this encoding is performed in UTF 8 i.e the characters will be converted in UTF-8 format.
encodeURIComponent differ from encodeURI in that it encode reserved characters and Number sign # of encodeURI
Aren't promises just callbacks?
In addition to the awesome answers above, 2 more points may be added:
1. Semantic difference:
Promises may be already resolved upon creation. This means they guarantee conditions rather than events. If they are resolved already, the resolved function passed to it is still called.
Conversely, callbacks handle events. So, if the event you are interested in has happened before the callback has been registered, the callback is not called.
2. Inversion of control
Callbacks involve inversion of control. When you register a callback function with any API, the Javascript runtime stores the callback function and calls it from the event loop once it is ready to be run.
Refer The Javascript Event loop for an explanation.
With Promises, control resides with the calling program. The .then() method may be called at any time if we store the promise object.
Error pushing to GitHub - insufficient permission for adding an object to repository database
Nothing of the above worked for me. A couple of hours later I found the reason for the problem:
I used a repo url of the type
ssh://[email protected]/~git/repo.git
Unfortunately I stored a putty session with the name example.com
which was configured to login as user myOtherUser
.
So, while I thought git connects to the host example.com
with the User 'git', Git/TortoiseGit has connected to the putty session example.com
which uses the User myOtherUser
. This leads to the exact same ..insufficient permission..
error (cause both users are in different groups).
Solution: Rename the putty session example.com
to [email protected]
Differences between INDEX, PRIMARY, UNIQUE, FULLTEXT in MySQL?
All of these are kinds of indices.
primary: must be unique, is an index, is (likely) the physical index, can be only one per table.
unique: as it says. You can't have more than one row with a tuple of this value. Note that since a unique key can be over more than one column, this doesn't necessarily mean that each individual column in the index is unique, but that each combination of values across these columns is unique.
index: if it's not primary or unique, it doesn't constrain values inserted into the table, but it does allow them to be looked up more efficiently.
fulltext: a more specialized form of indexing that allows full text search. Think of it as (essentially) creating an "index" for each "word" in the specified column.
What event handler to use for ComboBox Item Selected (Selected Item not necessarily changed)
For UWP (Windows Store) apps none of the above will work (PointerPressed doesn't fire; no Preview, DropDownClosed or SelectedIndexChanged events exist)
I had to resort to a transparent button overlaying the ComboBox (but not its drop down arrow). When you press on the arrow, the list drops down as usual and the Combo Box's SelectionChanged event fires. When you click anywhere else on the Combo Box the transparent button's click event fires allowing you to re-select the Combo Box's current value.
Some working XAML code:
<Grid x:Name="ComboOverlay" Margin="0,0,5,0"> <!--See comments in code behind at ClickedComboButValueHasntChanged event handler-->
<ComboBox x:Name="NewFunctionSelect" Width="97" ItemsSource="{x:Bind Functions}"
SelectedItem="{x:Bind ChosenFunction}" SelectionChanged="Function_SelectionChanged"/>
<Button x:Name="OldFunctionClick" Height="30" Width="73" Background="Transparent" Click="ClickedComboButValueHasntChanged"/>
</Grid>
Some working C# code:
/// <summary>
/// It is impossible to simply click a ComboBox to select the shown value again. It always drops down the list of options but
/// doesn't raise SelectionChanged event if the value selected from the list is the same as before
///
/// To handle this, a transparent button is overlaid over the ComboBox (but not its dropdown arrow) to allow reselecting the old value
/// Thus clicking over the dropdown arrow allows the user to select a new option from the list, but
/// clicking anywhere else in the Combo re-selects the previous value
/// </summary>
private void ClickedComboButValueHasntChanged(object sender, RoutedEventArgs e)
{
//You could also dummy up a SelectionChangedEvent event and raise it to invoke Function_SelectionChanged handler, below
FunctionEntered(NewFunctionSelect.SelectedValue as string);
}
private void Function_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
FunctionEntered(e.AddedItems[0] as string);
}
Exchange Powershell - How to invoke Exchange 2010 module from inside script?
I know this is an old question, but rather than adding the snapin which is apparently unsupported, I just looked at the EMS shortcut properties and copied those commands.
The full shortcut target is:
C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe -noexit -command ". 'C:\Program Files\Microsoft\Exchange Server\V14\bin\RemoteExchange.ps1'; Connect-ExchangeServer -auto"
So I put the following at the start of my script and it seemed to function as expected:
. 'C:\Program Files\Microsoft\Exchange Server\V14\bin\RemoteExchange.ps1'
Connect-ExchangeServer -auto
Notes:
- Has to be run in 64bit PS
- This was tested on a server with just the Management Tools installed. It automatically connected to our existing Exchange infrastructure.
- No extensive testing has been done, so I do not know if this method is viable. I will edit this post if I run into any issues.
java comparator, how to sort by integer?
One simple way is
Comparator<Dog> ageAscendingComp = ...;
Comparator<Dog> ageDescendingComp = Collections.reverseOrder(ageAscendingComp);
// then call the sort method
On a side note, Dog should really not implement Comparator
. It means you have to do strange things like
Collections.sort(myList, new Dog("Rex", 4));
// ^-- why is a new dog being made? What are we even sorting by?!
Collections.sort(myList, myList.get(0));
// ^-- or perhaps more confusingly
Rather you should make Compartors as separate classes.
eg.
public class DogAgeComparator implments Comparator<Dog> {
public int compareTo(Dog d1, Dog d2) {
return d1.getAge() - d2.getAge();
}
}
This has the added benefit that you can use the name of the class to say how the Comparator will sort the list. eg.
Collections.sort(someDogs, new DogNameComparator());
// now in name ascending order
Collections.sort(someDogs, Collections.reverseOrder(new DogAgeComparator()));
// now in age descending order
You should also not not have Dog implement Comparable
. The Comparable
interface is used to denote that there is some inherent and natural way to order these objects (such as for numbers and strings). Now this is not the case for Dog objects as sometimes you may wish to sort by age and sometimes you may wish to sort by name.
The property 'value' does not exist on value of type 'HTMLElement'
A quick fix for this is use [ ] to select the attribute.
function greet(elementId) {
var inputValue = document.getElementById(elementId)["value"];
if(inputValue.trim() == "") {
inputValue = "World";
}
document.getElementById("greet").innerText = greeter(inputValue);
}
I just try few methods and find out this solution,
I don't know what's the problem behind your original script.
For reference you may refer to Tomasz Nurkiewicz's post.
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);
How can I change the image of an ImageView?
Just to go a little bit further in the matter, you can also set a bitmap directly, like this:
ImageView imageView = new ImageView(this);
Bitmap bImage = BitmapFactory.decodeResource(this.getResources(), R.drawable.my_image);
imageView.setImageBitmap(bImage);
Of course, this technique is only useful if you need to change the image.
Processing $http response in service
tosh shimayama have a solution but you can simplify a lot if you use the fact that $http returns promises and that promises can return a value:
app.factory('myService', function($http, $q) {
myService.async = function() {
return $http.get('test.json')
.then(function (response) {
var data = reponse.data;
console.log(data);
return data;
});
};
return myService;
});
app.controller('MainCtrl', function( myService,$scope) {
$scope.asyncData = myService.async();
$scope.$watch('asyncData', function(asyncData) {
if(angular.isDefined(asyncData)) {
// Do something with the returned data, angular handle promises fine, you don't have to reassign the value to the scope if you just want to use it with angular directives
}
});
});
A little demonstration in coffeescript: http://plunker.no.de/edit/ksnErx?live=preview
Your plunker updated with my method: http://plnkr.co/edit/mwSZGK?p=preview
PHP exec() vs system() vs passthru()
If you're running your PHP script from the command-line, passthru()
has one large benefit. It will let you execute scripts/programs such as vim
, dialog
, etc, letting those programs handle control and returning to your script only when they are done.
If you use system()
or exec()
to execute those scripts/programs, it simply won't work.
Gotcha: For some reason, you can't execute less
with passthru()
in PHP.
Create folder in Android
If you are trying to make more than just one folder on the root of the sdcard,
ex. Environment.getExternalStorageDirectory() + "/Example/Ex App/"
then instead of folder.mkdir()
you would use folder.mkdirs()
I've made this mistake in the past & I took forever to figure it out.
Creating a LinkedList class from scratch
Hint 1: read the description of linked lists at http://en.wikipedia.org/wiki/Linked_list
Hint 2: the Java implementation of LinkedList is a doubly linked list. Yours is a singly linked list. The algorithms don't directly apply.
Also:
... but creating [a linked list class] from scratch makes no sense whatsoever.
It depends on what the required outcome of the work is. If the goal is to produce code that meets certain functional / non-functional requirements, then you are right. If the real goal is for you to learn how to program / design APIs / implement non-trivial data structures, then the utility of the final product is almost entirely irrelevant.
And thus magically we have a linked list
What you actually have there is a open data type, that could be used to build a (sort of) list. But that is not what your teacher wants. And it certainly would not be considered to be a useful list abstraction. A useful abstraction would include:
methods to do the things that programmers don't want to have to repeat over and over again, and
an abstraction layer that stops programmers "breaking" the list; e.g. by accidentally creating a cycle, or accidentally stitching a sublist in two lists to create an inverted tree.
Rounding a variable to two decimal places C#
Use System.Math.Round to rounds a decimal value to a specified number of fractional digits.
var pay = 200 + bonus;
pay = System.Math.Round(pay, 2);
Console.WriteLine(pay);
MSDN References:
How to read file from res/raw by name
You can read files in raw/res using getResources().openRawResource(R.raw.myfilename)
.
BUT there is an IDE limitation that the file name you use can only contain lower case alphanumeric characters and dot. So file names like XYZ.txt
or my_data.bin
will not be listed in R.
Why does cURL return error "(23) Failed writing body"?
Another possibility, if using the -o
(output file) option - the destination directory does not exist.
eg. if you have -o /tmp/download/abc.txt
and /tmp/download does not exist.
Hence, ensure any required directories are created/exist beforehand, use the --create-dirs
option as well as -o
if necessary
How to solve "java.io.IOException: error=12, Cannot allocate memory" calling Runtime#exec()?
overcommit_memory
Controls overcommit of system memory, possibly allowing processes to allocate (but not use) more memory than is actually available.
0 - Heuristic overcommit handling. Obvious overcommits of address space are refused. Used for a typical system. It ensures a seriously wild allocation fails while allowing overcommit to reduce swap usage. root is allowed to allocate slighly more memory in this mode. This is the default.
1 - Always overcommit. Appropriate for some scientific applications.
2 - Don't overcommit. The total address space commit for the system is not permitted to exceed swap plus a configurable percentage (default is 50) of physical RAM. Depending on the percentage you use, in most situations this means a process will not be killed while attempting to use already-allocated memory but will receive errors on memory allocation as appropriate.
Automatically size JPanel inside JFrame
You can set a layout manager like BorderLayout and then define more specifically, where your panel should go:
MainPanel mainPanel = new MainPanel();
JFrame mainFrame = new JFrame();
mainFrame.setLayout(new BorderLayout());
mainFrame.add(mainPanel, BorderLayout.CENTER);
mainFrame.pack();
mainFrame.setVisible(true);
This puts the panel into the center area of the frame and lets it grow automatically when resizing the frame.
In c# what does 'where T : class' mean?
where T: class
literally means that T has to be a class
. It can be any reference type. Now whenever any code calls your DoThis<T>()
method it must provide a class to replace T. For example if I were to call your DoThis<T>()
method then I will have to call it like following:
DoThis<MyClass>();
If your metthod is like like the following:
public IList<T> DoThis<T>() where T : class
{
T variablename = new T();
// other uses of T as a type
}
Then where ever T appears in your method, it will be replaced by MyClass. So the final method that the compiler calls , will look like the following:
public IList<MyClass> DoThis<MyClass>()
{
MyClass variablename= new MyClass();
//other uses of MyClass as a type
// all occurences of T will similarly be replace by MyClass
}
Android: Test Push Notification online (Google Cloud Messaging)
Found a very easy way to do this.
Open http://phpfiddle.org/
Paste following php script in box. In php script set API_ACCESS_KEY, set device ids separated by coma.
Press F9 or click Run.
Have fun ;)
<?php
// API access key from Google API's Console
define( 'API_ACCESS_KEY', 'YOUR-API-ACCESS-KEY-GOES-HERE' );
$registrationIds = array("YOUR DEVICE IDS WILL GO HERE" );
// prep the bundle
$msg = array
(
'message' => 'here is a message. message',
'title' => 'This is a title. title',
'subtitle' => 'This is a subtitle. subtitle',
'tickerText' => 'Ticker text here...Ticker text here...Ticker text here',
'vibrate' => 1,
'sound' => 1
);
$fields = array
(
'registration_ids' => $registrationIds,
'data' => $msg
);
$headers = array
(
'Authorization: key=' . API_ACCESS_KEY,
'Content-Type: application/json'
);
$ch = curl_init();
curl_setopt( $ch,CURLOPT_URL, 'https://android.googleapis.com/gcm/send' );
curl_setopt( $ch,CURLOPT_POST, true );
curl_setopt( $ch,CURLOPT_HTTPHEADER, $headers );
curl_setopt( $ch,CURLOPT_RETURNTRANSFER, true );
curl_setopt( $ch,CURLOPT_SSL_VERIFYPEER, false );
curl_setopt( $ch,CURLOPT_POSTFIELDS, json_encode( $fields ) );
$result = curl_exec($ch );
curl_close( $ch );
echo $result;
?>
For FCM, google url would be: https://fcm.googleapis.com/fcm/send
For FCM v1 google url would be: https://fcm.googleapis.com/v1/projects/YOUR_GOOGLE_CONSOLE_PROJECT_ID/messages:send
Note: While creating API Access Key on google developer console, you have to use 0.0.0.0/0 as ip address. (For testing purpose).
In case of receiving invalid Registration response from GCM server, please cross check the validity of your device token. You may check the validity of your device token using following url:
https://www.googleapis.com/oauth2/v1/tokeninfo?access_token=YOUR_DEVICE_TOKEN
Some response codes:
Following is the description of some response codes you may receive from server.
{ "message_id": "XXXX" } - success
{ "message_id": "XXXX", "registration_id": "XXXX" } - success, device registration id has been changed mainly due to app re-install
{ "error": "Unavailable" } - Server not available, resend the message
{ "error": "InvalidRegistration" } - Invalid device registration Id
{ "error": "NotRegistered"} - Application was uninstalled from the device
Is this the right way to clean-up Fragment back stack when leaving a deeply nested stack?
Well there are a few ways to go about this depending on the intended behavior, but this link should give you all the best solutions and not surprisingly is from Dianne Hackborn
http://groups.google.com/group/android-developers/browse_thread/thread/d2a5c203dad6ec42
Essentially you have the following options
- Use a name for your initial back stack state and use
FragmentManager.popBackStack(String name,
FragmentManager.POP_BACK_STACK_INCLUSIVE)
.
- Use
FragmentManager.getBackStackEntryCount()
/getBackStackEntryAt().getId()
to retrieve the ID of the first entry on the back stack, and
FragmentManager.popBackStack(int id,
FragmentManager.POP_BACK_STACK_INCLUSIVE)
.
FragmentManager.popBackStack(null, FragmentManager.POP_BACK_STACK_INCLUSIVE)
is supposed to pop the entire back stack... I think the documentation for
that is just wrong. (Actually I guess it just doesn't cover the case where
you pass in POP_BACK_STACK_INCLUSIVE
),
How can I add a Google search box to my website?
Sorry for replying on an older question, but I would like to clarify the last question.
You use a "get" method for your form.
When the name of your input-field is "g", it will make a URL like this:
https://www.google.com/search?g=[value from input-field]
But when you search with google, you notice the following URL:
https://www.google.nl/search?q=google+search+bar
Google uses the "q" Querystring variable as it's search-query.
Therefor, renaming your field from "g" to "q" solved the problem.
How To: Execute command line in C#, get STD OUT results
There one other parameter I found useful, which I use to eliminate the process window
pProcess.StartInfo.CreateNoWindow = true;
this helps to hide the black console window from user completely, if that is what you desire.
Dynamically add child components in React
Sharing my solution here, based on Chris' answer. Hope it can help others.
I needed to dynamically append child elements into my JSX, but in a simpler way than conditional checks in my return statement. I want to show a loader in the case that the child elements aren't ready yet. Here it is:
export class Settings extends React.PureComponent {
render() {
const loading = (<div>I'm Loading</div>);
let content = [];
let pushMessages = null;
let emailMessages = null;
if (this.props.pushPreferences) {
pushMessages = (<div>Push Content Here</div>);
}
if (this.props.emailPreferences) {
emailMessages = (<div>Email Content Here</div>);
}
// Push the components in the order I want
if (emailMessages) content.push(emailMessages);
if (pushMessages) content.push(pushMessages);
return (
<div>
{content.length ? content : loading}
</div>
)
}
Now, I do realize I could also just put {pushMessages}
and {emailMessages}
directly in my return()
below, but assuming I had even more conditional content, my return()
would just look cluttered.