Programs & Examples On #Serializable

Serialization is the process of converting a data structure or object state into a format that can be stored. The `SerializableAttribute` is a .NET Framework attribute that signifies the object is serializable. The `Serializable` Java marker interface indicates that an object can be serialized using standard JVM serialization mechanisms. Other languages and frameworks have similar abstract classes or attributes.

How to pass ArrayList<CustomeObject> from one activity to another?

You can pass an ArrayList<E> the same way, if the E type is Serializable.

You would call the putExtra (String name, Serializable value) of Intent to store, and getSerializableExtra (String name) for retrieval.

Example:

ArrayList<String> myList = new ArrayList<String>();
intent.putExtra("mylist", myList);

In the other Activity:

ArrayList<String> myList = (ArrayList<String>) getIntent().getSerializableExtra("mylist");

What is the difference between Serializable and Externalizable in Java?

https://docs.oracle.com/javase/8/docs/platform/serialization/spec/serialTOC.html

Default serialization is somewhat verbose, and assumes the widest possible usage scenario of the serialized object, and accordingly the default format (Serializable) annotates the resultant stream with information about the class of the serialized object.

Externalization give the producer of the object stream complete control over the precise class meta-data (if any) beyond the minimal required identification of the class (e.g. its name). This is clearly desirable in certain situations, such as closed environments, where producer of the object stream and its consumer (which reifies the object from the stream) are matched, and additional metadata about the class serves no purpose and degrades performance.

Additionally (as Uri point out) externalization also provides for complete control over the encoding of the data in the stream corresponding to Java types. For (a contrived) example, you may wish to record boolean true as 'Y' and false as 'N'. Externalization allows you to do that.

What does it mean: The serializable class does not declare a static final serialVersionUID field?

Any class that can be serialized (i.e. implements Serializable) should declare that UID and it must be changed whenever anything changes that affects the serialization (additional fields, removed fields, change of field order, ...). The field's value is checked during deserialization and if the value of the serialized object does not equal the value of the class in the current VM, an exception is thrown.

Note that this value is special in that it is serialized with the object even though it is static, for the reasons described above.

Android: Difference between Parcelable and Serializable?

I am late in answer, but posting with hope that it will help others.

In terms of Speed, Parcelable > Serializable. But, Custom Serializable is exception. It is almost in range of Parcelable or even more faster.

Reference : https://www.geeksforgeeks.org/customized-serialization-and-deserialization-in-java/

Example :

Custom Class to be serialized

class MySerialized implements Serializable { 

    String deviceAddress = "MyAndroid-04"; 

    transient String token = "AABCDS"; // sensitive information which I do not want to serialize

    private void writeObject(ObjectOutputStream oos) throws Exception {
        oos.defaultWriteObject();
        oos.writeObject("111111" + token); // Encrypted token to be serialized
    }

    private void readObject(ObjectInputStream ois) throws Exception {
        ois.defaultReadObject(); 
        token = ((String) ois.readObject()).subString(6);  // Decrypting token
    }

}

What is a JavaBean exactly?

Regarding the second part of your question, serialization is a persistence mechanism used to store objects as a sequence of signed bytes. Put less formally, it stores the state of an object so you can retrieve it later, by deserialization.

Intellij idea subversion checkout error: `Cannot run program "svn"`

I solved this by uncheking the "Use command-line client" option from Subversion settings.

This works with version 1.6 and 1.7 only. See @Vic's answer for SVN version 1.8.

Stacked Tabs in Bootstrap 3

Left, Right and Below tabs were removed from Bootstrap 3, but you can add custom CSS to achieve this..

.tabs-below > .nav-tabs,
.tabs-right > .nav-tabs,
.tabs-left > .nav-tabs {
  border-bottom: 0;
}

.tab-content > .tab-pane,
.pill-content > .pill-pane {
  display: none;
}

.tab-content > .active,
.pill-content > .active {
  display: block;
}

.tabs-below > .nav-tabs {
  border-top: 1px solid #ddd;
}

.tabs-below > .nav-tabs > li {
  margin-top: -1px;
  margin-bottom: 0;
}

.tabs-below > .nav-tabs > li > a {
  -webkit-border-radius: 0 0 4px 4px;
     -moz-border-radius: 0 0 4px 4px;
          border-radius: 0 0 4px 4px;
}

.tabs-below > .nav-tabs > li > a:hover,
.tabs-below > .nav-tabs > li > a:focus {
  border-top-color: #ddd;
  border-bottom-color: transparent;
}

.tabs-below > .nav-tabs > .active > a,
.tabs-below > .nav-tabs > .active > a:hover,
.tabs-below > .nav-tabs > .active > a:focus {
  border-color: transparent #ddd #ddd #ddd;
}

.tabs-left > .nav-tabs > li,
.tabs-right > .nav-tabs > li {
  float: none;
}

.tabs-left > .nav-tabs > li > a,
.tabs-right > .nav-tabs > li > a {
  min-width: 74px;
  margin-right: 0;
  margin-bottom: 3px;
}

.tabs-left > .nav-tabs {
  float: left;
  margin-right: 19px;
  border-right: 1px solid #ddd;
}

.tabs-left > .nav-tabs > li > a {
  margin-right: -1px;
  -webkit-border-radius: 4px 0 0 4px;
     -moz-border-radius: 4px 0 0 4px;
          border-radius: 4px 0 0 4px;
}

.tabs-left > .nav-tabs > li > a:hover,
.tabs-left > .nav-tabs > li > a:focus {
  border-color: #eeeeee #dddddd #eeeeee #eeeeee;
}

.tabs-left > .nav-tabs .active > a,
.tabs-left > .nav-tabs .active > a:hover,
.tabs-left > .nav-tabs .active > a:focus {
  border-color: #ddd transparent #ddd #ddd;
  *border-right-color: #ffffff;
}

.tabs-right > .nav-tabs {
  float: right;
  margin-left: 19px;
  border-left: 1px solid #ddd;
}

.tabs-right > .nav-tabs > li > a {
  margin-left: -1px;
  -webkit-border-radius: 0 4px 4px 0;
     -moz-border-radius: 0 4px 4px 0;
          border-radius: 0 4px 4px 0;
}

.tabs-right > .nav-tabs > li > a:hover,
.tabs-right > .nav-tabs > li > a:focus {
  border-color: #eeeeee #eeeeee #eeeeee #dddddd;
}

.tabs-right > .nav-tabs .active > a,
.tabs-right > .nav-tabs .active > a:hover,
.tabs-right > .nav-tabs .active > a:focus {
  border-color: #ddd #ddd #ddd transparent;
  *border-left-color: #ffffff;
}

Working example: http://bootply.com/74926

UPDATE

If you don't need the exact look of a tab (bordered appropriately on the left or right as each tab is activated), you can simple use nav-stacked, along with Bootstrap col-* to float the tabs to the left or right...

nav-stacked demo: http://codeply.com/go/rv3Cvr0lZ4

<ul class="nav nav-pills nav-stacked col-md-3">
    <li><a href="#a" data-toggle="tab">1</a></li>
    <li><a href="#b" data-toggle="tab">2</a></li>
    <li><a href="#c" data-toggle="tab">3</a></li>
</ul>

How do I grep recursively?

just the filenames can be useful too

grep -r -l "foo" .

Spring RestTemplate - how to enable full debugging/logging of requests/responses?

None of these answers actually solve 100% of the problem. mjj1409 gets most of it, but conveniently avoids the issue of logging the response, which takes a bit more work. Paul Sabou provides a solution that seems realistic, but doesn't provide enough details to actually implement (and it didn't work at all for me). Sofiene got the logging but with a critical problem: the response is no longer readable because the input stream has already been consumed!

I recommend using a BufferingClientHttpResponseWrapper to wrap the response object to allow reading the response body multiple times:

public class LoggingRequestInterceptor implements ClientHttpRequestInterceptor {

    private static final Logger logger = LoggerFactory.getLogger(LoggingRequestInterceptor.class);

    @Override
    public ClientHttpResponse intercept(final HttpRequest request, final byte[] body,
            final ClientHttpRequestExecution execution) throws IOException {
        ClientHttpResponse response = execution.execute(request, body);

        response = log(request, body, response);

        return response;
    }

    private ClientHttpResponse log(final HttpRequest request, final byte[] body, final ClientHttpResponse response) {
        final ClientHttpResponse responseCopy = new BufferingClientHttpResponseWrapper(response);
        logger.debug("Method: ", request.getMethod().toString());
        logger.debug("URI: ", , request.getURI().toString());
        logger.debug("Request Body: " + new String(body));
        logger.debug("Response body: " + IOUtils.toString(responseCopy.getBody()));
        return responseCopy;
    }

}

This will not consume the InputStream because the response body is loaded into memory and can be read multiple times. If you do not have the BufferingClientHttpResponseWrapper on your classpath, you can find the simple implementation here:

https://github.com/spring-projects/spring-android/blob/master/spring-android-rest-template/src/main/java/org/springframework/http/client/BufferingClientHttpResponseWrapper.java

For setting up the RestTemplate:

LoggingRequestInterceptor loggingInterceptor = new LoggingRequestInterceptor();
restTemplate.getInterceptors().add(loggingInterceptor);

git checkout all the files

Other way which I found useful is:

git checkout <wildcard> 

Example:

git checkout *.html

More generally:

git checkout <branch> <filename/wildcard>

%i or %d to print integer in C using printf()?

both %d and %i can be used to print an integer

%d stands for "decimal", and %i for "integer." You can use %x to print in hexadecimal, and %o to print in octal.

You can use %i as a synonym for %d, if you prefer to indicate "integer" instead of "decimal."

On input, using scanf(), you can use use both %i and %d as well. %i means parse it as an integer in any base (octal, hexadecimal, or decimal, as indicated by a 0 or 0x prefix), while %d means parse it as a decimal integer.

check here for more explanation

why does %d stand for Integer?

Python xticks in subplots

There are two ways:

  1. Use the axes methods of the subplot object (e.g. ax.set_xticks and ax.set_xticklabels) or
  2. Use plt.sca to set the current axes for the pyplot state machine (i.e. the plt interface).

As an example (this also illustrates using setp to change the properties of all of the subplots):

import matplotlib.pyplot as plt

fig, axes = plt.subplots(nrows=3, ncols=4)

# Set the ticks and ticklabels for all axes
plt.setp(axes, xticks=[0.1, 0.5, 0.9], xticklabels=['a', 'b', 'c'],
        yticks=[1, 2, 3])

# Use the pyplot interface to change just one subplot...
plt.sca(axes[1, 1])
plt.xticks(range(3), ['A', 'Big', 'Cat'], color='red')

fig.tight_layout()
plt.show()

enter image description here

Find row in datatable with specific id

Make a string criteria to search for, like this:

string searchExpression = "ID = 5"

Then use the .Select() method of the DataTable object, like this:

DataRow[] foundRows = YourDataTable.Select(searchExpression);

Now you can loop through the results, like this:

int numberOfCalls;
bool result;
foreach(DataRow dr in foundRows)
{
    // Get value of Calls here
    result = Int32.TryParse(dr["Calls"], out numberOfCalls);

    // Optionally, you can check the result of the attempted try parse here
    // and do something if you wish
    if(result)
    {
        // Try parse to 32-bit integer worked

    }
    else
    {
        // Try parse to 32-bit integer failed

    }
}

Lumen: get URL parameter in a Blade view

As per official documentation 8.x

We use the helper request

The request function returns the current request instance or obtains an input field's value from the current request:

$request = request();

$value = request('key', $default);

the value of request is an array you can simply retrieve your input using the input key as follow

$id = request()->id; //for http://locahost:8000/example?id=10

indexOf and lastIndexOf in PHP?

You need the following functions to do this in PHP:

strpos Find the position of the first occurrence of a substring in a string

strrpos Find the position of the last occurrence of a substring in a string

substr Return part of a string

Here's the signature of the substr function:

string substr ( string $string , int $start [, int $length ] )

The signature of the substring function (Java) looks a bit different:

string substring( int beginIndex, int endIndex )

substring (Java) expects the end-index as the last parameter, but substr (PHP) expects a length.

It's not hard, to get the desired length by the end-index in PHP:

$sub = substr($str, $start, $end - $start);

Here is the working code

$start = strpos($message, '-') + 1;
if ($req_type === 'RMT') {
    $pt_password = substr($message, $start);
}
else {
    $end = strrpos($message, '-');
    $pt_password = substr($message, $start, $end - $start);
}

CURRENT_TIMESTAMP in milliseconds

Use:

Select curtime(4);

This will give you milliseconds.

Should I use <i> tag for icons instead of <span>?

I also found this to be useful when i wanted to place an icon with absolute positioning inside a link <a> tag.

I thought about the <img> tag first, but default styling of those tags inside links typically have border styling and/or shadow effects. Plus, it feels wrong to use an <img> tag without defining an "src" attribute whereas i'm using a background-image style sheet declaration so that the image doesn't ghost and drag.

At this point you're thinking of tags like <span> or <i> - in which case <i> makes so much sense as this type of icon.

All in all i think its benefit besides being intuitive is that it requires minimal style sheet adjustments to make this tag work as an icon.

Convert an array into an ArrayList

List<Card> list = new ArrayList<Card>(Arrays.asList(hand));

How to prevent going back to the previous activity?

There are two solutions for your case, activity A starts activity B, but you do not want to back to activity A in activity B.

1. Removed previous activity A from back stack.

    Intent intent = new Intent(activityA.this, activityB.class);
    startActivity(intent);
    finish(); // Destroy activity A and not exist in Back stack

2. Disabled go back button action in activity B.

There are two ways to prevent go back event as below,

1) Recommend approach

@Override
public void onBackPressed() {
}

2)Override onKeyDown method

@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
    if(keyCode==KeyEvent.KEYCODE_BACK) {
        return false;
    }
    return super.onKeyDown(keyCode, event);
}

Hope that it is useful, but still depends on your situations.

How to add files/folders to .gitignore in IntelliJ IDEA?

I'm using intelliJ 15 community edition and I'm able to right click a file and select 'add to .gitignore'

Calling a javascript function recursively

I know this is an old question, but I thought I'd present one more solution that could be used if you'd like to avoid using named function expressions. (Not saying you should or should not avoid them, just presenting another solution)

  var fn = (function() {
    var innerFn = function(counter) {
      console.log(counter);

      if(counter > 0) {
        innerFn(counter-1);
      }
    };

    return innerFn;
  })();

  console.log("running fn");
  fn(3);

  var copyFn = fn;

  console.log("running copyFn");
  copyFn(3);

  fn = function() { console.log("done"); };

  console.log("fn after reassignment");
  fn(3);

  console.log("copyFn after reassignment of fn");
  copyFn(3);

Selecting multiple classes with jQuery

I use $('.myClass.myOtherClass').removeClass('theclass');

Add external libraries to CMakeList.txt c++

I would start with upgrade of CMAKE version.

You can use INCLUDE_DIRECTORIES for header location and LINK_DIRECTORIES + TARGET_LINK_LIBRARIES for libraries

INCLUDE_DIRECTORIES(your/header/dir)
LINK_DIRECTORIES(your/library/dir)
rosbuild_add_executable(kinectueye src/kinect_ueye.cpp)
TARGET_LINK_LIBRARIES(kinectueye lib1 lib2 lib2 ...)

note that lib1 is expanded to liblib1.so (on Linux), so use ln to create appropriate links in case you do not have them

Resize height with Highcharts

You must set the height of the container explicitly

#container {
    height:100%;
    width:100%;
    position:absolute; 
}

See other Stackoverflow answer

Highcharts documentation

Pseudo-terminal will not be allocated because stdin is not a terminal

I don't know where the hang comes from, but redirecting (or piping) commands into an interactive ssh is in general a recipe for problems. It is more robust to use the command-to-run-as-a-last-argument style and pass the script on the ssh command line:

ssh user@server 'DEP_ROOT="/home/matthewr/releases"
datestamp=$(date +%Y%m%d%H%M%S)
REL_DIR=$DEP_ROOT"/"$datestamp
if [ ! -d "$DEP_ROOT" ]; then
    echo "creating the root directory"
    mkdir $DEP_ROOT
fi
mkdir $REL_DIR'

(All in one giant '-delimited multiline command-line argument).

The pseudo-terminal message is because of your -t which asks ssh to try to make the environment it runs on the remote machine look like an actual terminal to the programs that run there. Your ssh client is refusing to do that because its own standard input is not a terminal, so it has no way to pass the special terminal APIs onwards from the remote machine to your actual terminal at the local end.

What were you trying to achieve with -t anyway?

Get the Highlighted/Selected text

Use window.getSelection().toString().

You can read more on developer.mozilla.org

How do I display a ratio in Excel in the format A:B?

Below is the formula I use. I had a problem using GCD, because I use fairly large numbers to calculate the ratios from, and I found ratios such as "209:1024" to be less useful than simply rounding so it displays either "1:" or ":1". I also prefer not to use macros, if at all possible. Below is the result.

=IF(A1>B1,((ROUND(A1/B1,0))&":"&(B1/B1)),((A1/A1)&":"&(ROUND(B1/A1,0))))

Some of the formula is unnecessary (e.g., "A1/A1"), but I included it to show the logic behind it. Also, you can toggle how much rounding occurs by playing with the setting on each ROUND function.

How do I use a C# Class Library in a project?

Here is a good article on creating and adding a class library. Even shows how to create Methods through the method wizard and how to use it in the application

Combining node.js and Python

I'd consider also Apache Thrift http://thrift.apache.org/

It can bridge between several programming languages, is highly efficient and has support for async or sync calls. See full features here http://thrift.apache.org/docs/features/

The multi language can be useful for future plans, for example if you later want to do part of the computational task in C++ it's very easy to do add it to the mix using Thrift.

Define preprocessor macro through CMake?

To do this for a specific target, you can do the following:

target_compile_definitions(my_target PRIVATE FOO=1 BAR=1)

You should do this if you have more than one target that you're building and you don't want them all to use the same flags. Also see the official documentation on target_compile_definitions.

Logical XOR operator in C++?

There is another way to do XOR:

bool XOR(bool a, bool b)
{
    return (a + b) % 2;
}

Which obviously can be demonstrated to work via:

#include <iostream>

bool XOR(bool a, bool b)
{
    return (a + b) % 2;
}

int main()
{
    using namespace std;
    cout << "XOR(true, true):\t" << XOR(true, true) << endl
         << "XOR(true, false):\t" << XOR(true, false) << endl
         << "XOR(false, true):\t" << XOR(false, true) << endl
         << "XOR(false, false):\t" << XOR(false, false) << endl
         << "XOR(0, 0):\t\t" << XOR(0, 0) << endl
         << "XOR(1, 0):\t\t" << XOR(1, 0) << endl
         << "XOR(5, 0):\t\t" << XOR(5, 0) << endl
         << "XOR(20, 0):\t\t" << XOR(20, 0) << endl
         << "XOR(6, 6):\t\t" << XOR(5, 5) << endl
         << "XOR(5, 6):\t\t" << XOR(5, 6) << endl
         << "XOR(1, 1):\t\t" << XOR(1, 1) << endl;
    return 0;
}

`node-pre-gyp install --fallback-to-build` failed during MeanJS installation on OSX

I was gone through same problem solved after lot efforts. It is because of npm version is not compatible with gprc version. So we need to update the npm.

npm update
npm install 

Update all objects in a collection using LINQ

I assume you want to change values inside a query so you could write a function for it

void DoStuff()
{
    Func<string, Foo, bool> test = (y, x) => { x.Bar = y; return true; };
    List<Foo> mylist = new List<Foo>();
    var v = from x in mylist
            where test("value", x)
            select x;
}

class Foo
{
    string Bar { get; set; }
}

But not shure if this is what you mean.

Detailed 500 error message, ASP + IIS 7.5

TLDR:First determine where in the pipeline you're getting the error from (scroll looking for screenshots of something that resembles your error), make changes to get something new, repeat.

First determine what error message you are actually seeing.

If you are seeing the file located here...

%SystemDrive%\inetpub\custerr\\500.htm

...which generally looks like this:

IIS Default 500 error

...then you know you are seeing the currently configured error page in **IIS ** and you do NOT need to change the ASP.net customErrors setting, asp error detail setting, or "show friendly http errors" browser setting.

You may want to look at the above referenced path instead of trusting my screenshot just in case somebody changed it.

"Yes, I see the above described error..."

In this case, you are seeing the setting of <httpErrors> or in IIS Manager it's Error Pages --> Edit Feature Settings. The default for this is errorMode=DetailedLocalOnly at the server node level (as opposed to the site level) which means that while you will see this configured error page while remote, you should be able to log on locally to the server and see the full error which should look something like this:

Detailed HTTP Error

You should have everything that you need at that point to fix the current error.

"But I don't see the detailed error even browsing on the server"

That leaves a couple of possibilities.

  1. The browser you are using on the server is configured to use a proxy in its connection settings so it is not being seen as "local".
  2. You're not actually browsing to the site you think you are browsing to - this commonly happens when there's a load balancer involved. Do a ping check to see if dns gives you an IP on the server or somewhere else.
  3. You're site's httpErrors settings is set for "Custom" only. Change it to "DetailedLocalOnly". However, if you have a configuration error, this may not work since the site level httpErrors is also a configuration item. In that case proceed to #4
  4. The default for httpErrors for all sites is set for "Custom". In this case you need to click on the top level server node in IIS Manager (and not a particular site) and change the httpErrors settings there to DetailedLocalOnly. If this is an internal server and you're not worried about divulging sensitive information, you could also set it to "Detailed" which will allow you to see the error from clients other than the server.
  5. You're missing a module on the server like UrlRewrite (this one bites me a lot, and it often gives the generic message regardless of the httpErrors settings).

"Logging on to the server is not an option for me"

Change your site's httpErrors to "Detailed" so you can see it remotely. But if it doesn't work your error might already be a config error, see #3 immediately above. So you might be stuck with #4 or #5 and you're going to need somebody from your server team.

"I'm not seeing the error page described above. I'm seeing something different"

If you see this...

enter image description here

...and you expect to see something like this...

enter image description here

...then you need to change "Send errors to browser" to true in IIS Manager, under Site --> IIS --> ASP --> Debugging Properties

If you see this...

ie friendly errors 1

or this...

ie friendly errors 2

...you need to disable friendly errors in your browser or use fiddler's webview to look at the actual response vs what your browser chooses to show you.

If you see this...

Custom errors enabled

...then custom errors is working but you don't have a custom error page (of course at this point were talking about .net and not classic asp). You need to change your customErrors tag in your web.config to RemoteOnly to view on the server, or Off to view remotely.

If you see something that is styled like your site, then custom errors is likely On or RemoteOnly and it's displaying the custom page (Views->Shared->Error.cshtml in MVC for example). That said, it is unlikely but possible that somebody changed the pages in IIS for httpErrors so see the first section on that.

Putting a password to a user in PhpMyAdmin in Wamp

There is a file called config.inc.php in the phpmyadmin folder.

The file path is C:\wamp\apps\phpmyadmin4.0.4

Edit The auth_type 'cookie' to 'config' or 'http'

$cfg['Servers'][$i]['auth_type'] = 'cookie';

$cfg['Servers'][$i]['auth_type'] = 'config';

or

$cfg['Servers'][$i]['auth_type'] = 'http';

When you go to the phpmyadmin site then you will be asked for the username and password. This also secure external people from accessing your phpmyadmin application if you happen to have your web server exposed to outside connections.

SyntaxError: Use of const in strict mode?

Usually this error occurs when the version of node against which the code is being executed is older than expected. (i.e. 0.12 or older).

if you are using nvm than please ensure that you have the right version of node being used. You can check the compatibility on node.green for const under strict mode

I found a similar issue on another post and posted my answer there in detail

CSS transition effect makes image blurry / moves image 1px, in Chrome?

I had a similar problem with blurry text but only the succeeding div was affected. For some reason the next div after the one that I was doing the transform in was blurry.

I tried everything that is recommended in this thread but nothing worked. For me rearranging my divs worked. I moved the div that blurres the following div to the end of parents div.

If someone know why just let me know.

#before
<header class="container">
      <div class="transformed div">
          <span class="transform wrapper">
            <span class="transformed"></span>
            <span class="transformed"></span>
          </span>
       </div>
       <div class="affected div">
       </div>
     </header>

#after
<header class="container">
   <div class="affected div">
   </div>
  <div class="transformed div">
      <span class="transform wrapper">
        <span class="transformed"></span>
        <span class="transformed"></span>
      </span>
   </div>

 </header>

Angular2 Material Dialog css, dialog size

I think you need to use /deep/, because your CSS may not see your modal class. For example, if you want to customize .modal-dialog

/deep/.modal-dialog {
  width: 75% !important;
}

But this code will modify all your modal-windows, better solution will be

:host {
  /deep/.modal-dialog {
  width: 75% !important;
  }
}

Converting a vector<int> to string

Here is an alternative which uses a custom output iterator. This example behaves correctly for the case of an empty list. This example demonstrates how to create a custom output iterator, similar to std::ostream_iterator.

#include <iterator>
#include <vector>
#include <iostream>
#include <sstream>

struct CommaIterator
:
  public std::iterator<std::output_iterator_tag, void, void, void, void>
{
  std::ostream *os;
  std::string comma;
  bool first;

  CommaIterator(std::ostream& os, const std::string& comma)
  :
    os(&os), comma(comma), first(true)
  {
  }

  CommaIterator& operator++() { return *this; }
  CommaIterator& operator++(int) { return *this; }
  CommaIterator& operator*() { return *this; }
  template <class T>
  CommaIterator& operator=(const T& t) {
    if(first)
      first = false;
    else
      *os << comma;
    *os << t;
    return *this;
  }
};

int main () {
  // The vector to convert
  std::vector<int> v(3,3);

  // Convert vector to string
  std::ostringstream oss;
  std::copy(v.begin(), v.end(), CommaIterator(oss, ","));
  std::string result = oss.str();
  const char *c_result = result.c_str();

  // Display the result;
  std::cout << c_result << "\n";
}

Bootstrap fixed header and footer with scrolling body-content area in fluid-container

Another option would be using flexbox.

While it's not supported by IE8 and IE9, you could consider:

  • Not minding about those old IE versions
  • Providing a fallback
  • Using a polyfill

Despite some additional browser-specific style prefixing would be necessary for full cross-browser support, you can see the basic usage either on this fiddle and on the following snippet:

_x000D_
_x000D_
html {_x000D_
  height: 100%;_x000D_
}_x000D_
html body {_x000D_
  height: 100%;_x000D_
  overflow: hidden;_x000D_
  display: flex;_x000D_
  flex-direction: column;_x000D_
}_x000D_
html body .container-fluid.body-content {_x000D_
  width: 100%;_x000D_
  overflow-y: auto;_x000D_
}_x000D_
header {_x000D_
    background-color: #4C4;_x000D_
    min-height: 50px;_x000D_
    width: 100%;_x000D_
}_x000D_
footer {_x000D_
    background-color: #4C4;_x000D_
    min-height: 30px;_x000D_
    width: 100%;_x000D_
}
_x000D_
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.2/css/bootstrap.min.css" rel="stylesheet"/>_x000D_
<header></header>_x000D_
<div class="container-fluid body-content">_x000D_
  Lorem Ipsum<br/>Lorem Ipsum<br/>Lorem Ipsum<br/>Lorem Ipsum<br/>Lorem Ipsum<br/>_x000D_
  Lorem Ipsum<br/>Lorem Ipsum<br/>Lorem Ipsum<br/>Lorem Ipsum<br/>Lorem Ipsum<br/>_x000D_
  Lorem Ipsum<br/>Lorem Ipsum<br/>Lorem Ipsum<br/>Lorem Ipsum<br/>Lorem Ipsum<br/>_x000D_
  Lorem Ipsum<br/>Lorem Ipsum<br/>Lorem Ipsum<br/>Lorem Ipsum<br/>Lorem Ipsum<br/>_x000D_
  Lorem Ipsum<br/>Lorem Ipsum<br/>Lorem Ipsum<br/>Lorem Ipsum<br/>Lorem Ipsum<br/>_x000D_
</div>_x000D_
<footer></footer>
_x000D_
_x000D_
_x000D_

filename.whl is not supported wheel on this platform

Alright, the problem is easy. Tensorflow require python 3.4 - 3.7 and 64bit. I see than you're using python 2.7.

Read the tensorflow install instructions here: https://www.tensorflow.org/install/pip

I want to truncate a text or line with ellipsis using JavaScript

Easiest and flexible way: JSnippet DEMO

Function style:

function truncString(str, max, add){
   add = add || '...';
   return (typeof str === 'string' && str.length > max ? str.substring(0,max)+add : str);
};

Prototype:

String.prototype.truncString = function(max, add){
   add = add || '...';
   return (this.length > max ? this.substring(0,max)+add : this);
};

Usage:

str = "testing with some string see console output";

//By prototype:
console.log(  str.truncString(15,'...')  );

//By function call:
console.log(  truncString(str,15,'...')  );

jQuery & CSS - Remove/Add display:none

i'd suggest adding a class to display/hide elements:

.hide { display:none; }

and then use jquery's .toggleClass() to show/hide the element:

$(".news").toggleClass("hide");

Remove specific characters from a string in Javascript

Regexp solution:

ref = ref.replace(/^F0/, "");

plain solution:

if (ref.substr(0, 2) == "F0")
     ref = ref.substr(2);

ComboBox: Adding Text and Value to an Item (no Binding Source)

This is how Visual Studio 2013 does it:

Single item:

comboBox1->Items->AddRange(gcnew cli::array< System::Object^  >(1) { L"Combo Item 1" });

Multiple Items:

comboBox1->Items->AddRange(gcnew cli::array< System::Object^  >(3)
{
    L"Combo Item 1",
    L"Combo Item 2",
    L"Combo Item 3"
});

No need to do class overrides or include anything else. And yes the comboBox1->SelectedItem and comboBox1->SelectedIndex calls still work.

What does ||= (or-equals) mean in Ruby?

As a common misconception, a ||= b is not equivalent to a = a || b, but it behaves like a || a = b.

But here comes a tricky case. If a is not defined, a || a = 42 raises NameError, while a ||= 42 returns 42. So, they don't seem to be equivalent expressions.

Convert javascript array to string

jQuery.each is just looping over the array, it doesn't do anything with the return value?. You are looking for jQuery.map (I also think that get() is unnecessary as you are not dealing with jQuery objects):

var blkstr = $.map(value, function(val,index) {                    
     var str = index + ":" + val;
     return str;
}).join(", ");  

DEMO


But why use jQuery at all in this case? map only introduces an unnecessary function call per element.

var values = [];

for(var i = 0, l = value.length; i < l; i++) {
    values.push(i + ':' + value[i]);
}

// or if you actually have an object:

for(var id in value) {
    if(value.hasOwnProperty(id)) {
        values.push(id + ':' + value[id]);
    }
}

var blkstr = values.join(', ');

?: It only uses the return value whether it should continue to loop over the elements or not. Returning a "falsy" value will stop the loop.

How do you change Background for a Button MouseOver in WPF?

All of the answers so far involve completely replacing the default button behavior with something else. However, IMHO it is useful and important to understand that it's possible to change just the part you care about, by editing the existing, default template for a XAML element.

In the case of dealing with the hover effect on a WPF button, the change in appearance in a WPF Button element is caused by a Trigger in the default style for the Button, which is based on the IsMouseOver property and sets the Background and BorderBrush properties of the top-level Border element in the control template. The Button element's background is underneath the Border element's background, so changing the Button.Background property doesn't prevent the hover effect from being seen.

With some effort, you could override this behavior with your own setter, but because the element you need to affect is in the template and not directly accessible in your own XAML, that approach would be difficult and IMHO overly complex.

Another option would be to make use the graphic as the Content for the Button rather than the Background. If you need additional content over the graphic, you can combine them with a Grid as the top-level object in the content.

However, if you literally just want to disable the hover effect entirely (rather than just hiding it), you can use the Visual Studio XAML Designer:

  1. While editing your XAML, select the "Design" tab.
  2. In the "Design" tab, find the button for which you want to disable the effect.
  3. Right-click that button, and choose "Edit Template/Edit a Copy...". Select in the prompt you get where you want the new template resource to be placed. This will appear to do nothing, but in fact the Designer will have added new resources where you told it, and changed your button element to reference the style that uses those resources as the button template.
  4. Now, you can go edit that style. The easiest thing is to delete or comment-out (e.g. Ctrl+E, C) the <Trigger Property="IsMouseOver" Value="true">...</Trigger> element. Of course, you can make any change to the template you want at that point.

When you're done, the button style will look something like this:

<p:Style x:Key="FocusVisual">
  <Setter Property="Control.Template">
    <Setter.Value>
      <ControlTemplate>
        <Rectangle Margin="2" SnapsToDevicePixels="true" Stroke="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}" StrokeThickness="1" StrokeDashArray="1 2"/>
      </ControlTemplate>
    </Setter.Value>
  </Setter>
</p:Style>
<SolidColorBrush x:Key="Button.Static.Background" Color="#FFDDDDDD"/>
<SolidColorBrush x:Key="Button.Static.Border" Color="#FF707070"/>
<SolidColorBrush x:Key="Button.MouseOver.Background" Color="#FFBEE6FD"/>
<SolidColorBrush x:Key="Button.MouseOver.Border" Color="#FF3C7FB1"/>
<SolidColorBrush x:Key="Button.Pressed.Background" Color="#FFC4E5F6"/>
<SolidColorBrush x:Key="Button.Pressed.Border" Color="#FF2C628B"/>
<SolidColorBrush x:Key="Button.Disabled.Background" Color="#FFF4F4F4"/>
<SolidColorBrush x:Key="Button.Disabled.Border" Color="#FFADB2B5"/>
<SolidColorBrush x:Key="Button.Disabled.Foreground" Color="#FF838383"/>
<p:Style x:Key="ButtonStyle1" TargetType="{x:Type Button}">
  <Setter Property="FocusVisualStyle" Value="{StaticResource FocusVisual}"/>
  <Setter Property="Background" Value="{StaticResource Button.Static.Background}"/>
  <Setter Property="BorderBrush" Value="{StaticResource Button.Static.Border}"/>
  <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}"/>
  <Setter Property="BorderThickness" Value="1"/>
  <Setter Property="HorizontalContentAlignment" Value="Center"/>
  <Setter Property="VerticalContentAlignment" Value="Center"/>
  <Setter Property="Padding" Value="1"/>
  <Setter Property="Template">
    <Setter.Value>
      <ControlTemplate TargetType="{x:Type Button}">
        <Border x:Name="border" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" SnapsToDevicePixels="true">
          <ContentPresenter x:Name="contentPresenter" Focusable="False" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" Margin="{TemplateBinding Padding}" RecognizesAccessKey="True" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/>
        </Border>
        <ControlTemplate.Triggers>
          <Trigger Property="IsDefaulted" Value="true">
            <Setter Property="BorderBrush" TargetName="border" Value="{DynamicResource {x:Static SystemColors.HighlightBrushKey}}"/>
          </Trigger>
          <!--<Trigger Property="IsMouseOver" Value="true">
            <Setter Property="Background" TargetName="border" Value="{StaticResource Button.MouseOver.Background}"/>
            <Setter Property="BorderBrush" TargetName="border" Value="{StaticResource Button.MouseOver.Border}"/>
          </Trigger>-->
          <Trigger Property="IsPressed" Value="true">
            <Setter Property="Background" TargetName="border" Value="{StaticResource Button.Pressed.Background}"/>
            <Setter Property="BorderBrush" TargetName="border" Value="{StaticResource Button.Pressed.Border}"/>
          </Trigger>
          <Trigger Property="IsEnabled" Value="false">
            <Setter Property="Background" TargetName="border" Value="{StaticResource Button.Disabled.Background}"/>
            <Setter Property="BorderBrush" TargetName="border" Value="{StaticResource Button.Disabled.Border}"/>
            <Setter Property="TextElement.Foreground" TargetName="contentPresenter" Value="{StaticResource Button.Disabled.Foreground}"/>
          </Trigger>
        </ControlTemplate.Triggers>
      </ControlTemplate>
    </Setter.Value>
  </Setter>
</p:Style>

(Note: you can omit the p: XML namespace qualifications in the actual code…I provide them here only because the Stack Overflow XML code formatter gets confused by <Style/> elements that don't have a fully-qualified name with XML namespace.)

If you want to apply the same style to other buttons, you can just right-click them and choose "Edit Template/Apply Resource" and select the style you just added for the first button. You can even make that style the default style for all buttons, using the normal techniques for applying a default style to elements in XAML.

Copy files to network computers on windows command line

check Robocopy:

ROBOCOPY \\server-source\c$\VMExports\ C:\VMExports\ /E /COPY:DAT

make sure you check what robocopy parameter you want. this is just an example. type robocopy /? in a comandline/powershell on your windows system.

How to provide shadow to Button

For android version 5.0 & above

try the Elevation for other views..

android:elevation="10dp"

For Buttons,

android:stateListAnimator="@anim/button_state_list_animator"

button_state_list_animator.xml - https://android.googlesource.com/platform/frameworks/base/+/master/core/res/res/anim/button_state_list_anim_material.xml

below 5.0 version,

For all views,

 android:background="@android:drawable/dialog_holo_light_frame"

My output:

enter image description here

How to get the location of the DLL currently executing?

System.Reflection.Assembly.GetExecutingAssembly().Location

Execute an action when an item on the combobox is selected

The simple solution would be to use a ItemListener. When the state changes, you would simply check the currently selected item and set the text accordingly

import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;

public class TestComboBox06 {

    public static void main(String[] args) {
        new TestComboBox06();
    }

    public TestComboBox06() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException ex) {
                } catch (InstantiationException ex) {
                } catch (IllegalAccessException ex) {
                } catch (UnsupportedLookAndFeelException ex) {
                }

                JFrame frame = new JFrame("Test");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.setLayout(new BorderLayout());
                frame.add(new TestPane());
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }

        });
    }

    public class TestPane extends JPanel {

        private JComboBox cb;
        private JTextField field;

        public TestPane() {
            cb = new JComboBox(new String[]{"Item 1", "Item 2"});
            field = new JTextField(12);

            add(cb);
            add(field);

            cb.setSelectedItem(null);

            cb.addItemListener(new ItemListener() {
                @Override
                public void itemStateChanged(ItemEvent e) {
                    Object item = cb.getSelectedItem();
                    if ("Item 1".equals(item)) {
                        field.setText("20");
                    } else if ("Item 2".equals(item)) {
                        field.setText("30");
                    }
                }
            });
        }

    }

}

A better solution would be to create a custom object that represents the value to be displayed and the value associated with it...

Updated

Now I no longer have a 10 month chewing on my ankles, I updated the example to use a ListCellRenderer which is a more correct approach then been lazy and overriding toString

import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.EventQueue;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import javax.swing.DefaultListCellRenderer;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;

public class TestComboBox06 {

    public static void main(String[] args) {
        new TestComboBox06();
    }

    public TestComboBox06() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException ex) {
                } catch (InstantiationException ex) {
                } catch (IllegalAccessException ex) {
                } catch (UnsupportedLookAndFeelException ex) {
                }

                JFrame frame = new JFrame("Test");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.setLayout(new BorderLayout());
                frame.add(new TestPane());
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }

        });
    }

    public class TestPane extends JPanel {

        private JComboBox cb;
        private JTextField field;

        public TestPane() {
            cb = new JComboBox(new Item[]{
                new Item("Item 1", "20"), 
                new Item("Item 2", "30")});
            cb.setRenderer(new ItemCelLRenderer());
            field = new JTextField(12);

            add(cb);
            add(field);

            cb.setSelectedItem(null);

            cb.addItemListener(new ItemListener() {
                @Override
                public void itemStateChanged(ItemEvent e) {
                    Item item = (Item)cb.getSelectedItem();
                    field.setText(item.getValue());
                }
            });
        }

    }

    public class Item {
        private String value;
        private String text;

        public Item(String text, String value) {
            this.text = text;
            this.value = value;
        }

        public String getText() {
            return text;
        }

        public String getValue() {
            return value;
        }

    }

    public class ItemCelLRenderer extends DefaultListCellRenderer {

        @Override
        public Component getListCellRendererComponent(JList<?> list, Object value, int index, boolean isSelected, boolean cellHasFocus) {
            super.getListCellRendererComponent(list, value, index, isSelected, cellHasFocus); //To change body of generated methods, choose Tools | Templates.
            if (value instanceof Item) {
                setText(((Item)value).getText());
            }
            return this;
        }

    }

}

How to fix syntax error, unexpected T_IF error in php?

Here is the issue

  $total_result = $result->num_rows;

try this

<?php
if ($result = $mysqli->query("SELECT * FROM players ORDER BY id"))
{
    if ($result->num_rows > 0)
    {
        $total_result = $result->num_rows;
        $total_pages = ceil($total_result / $per_page);

        if(isset($_GET['page']) && is_numeric($_GET['page']))
        {
            $show_page = $_GET['page'];

            if ($show_page > 0 && $show_page <= $total_pages)
            {
                $start = ($show_page - 1) * $per_page;
                $end = $start + $per_page;
            }
            else
            {
                $start = 0;
                $end = $per_page;
            }               

        }
        else
        {
            $start = 0;
            $end = $per_page;
        }


        //display paginations
        echo "<p> View pages: ";
        for ($i=1; $i < $total_pages; $i++)
        { 
            if (isset($_GET['page']) && $_GET['page'] == $i)
            {
                echo  $i . " ";
            }
            else
            {
                echo "<a href='view-pag.php?$i'>" . $i . "</a> | ";
            }

        }
        echo "</p>";

    }
    else
    {
        echo "No result to display.";
    }

}
else
{
    echo "Error: " . $mysqli->error;
}


?>

Gradle finds wrong JAVA_HOME even though it's correctly set

In my dockercontainer (being minimal the problem of not finding java) was, that "which" was not installed. Comipling a project using gradlew used which in ./gradlew to find java Installing which solved the problem.

Msg 102, Level 15, State 1, Line 1 Incorrect syntax near ' '

For the OP's command:

select compid,2, convert(datetime, '01/01/' + CONVERT(char(4),cal_yr) ,101) ,0,  Update_dt, th1, th2, th3_pc , Update_id, Update_dt,1
from  #tmp_CTF** 

I get this error:

Msg 102, Level 15, State 1, Line 2
Incorrect syntax near '*'.

when debugging something like this split the long line up so you'll get a better row number:

select compid
,2
, convert(datetime
, '01/01/' 
+ CONVERT(char(4)
,cal_yr) 
,101) 
,0
,  Update_dt
, th1
, th2
, th3_pc 
, Update_id
, Update_dt
,1
from  #tmp_CTF** 

this now results in:

Msg 102, Level 15, State 1, Line 16
Incorrect syntax near '*'.

which is probably just from the OP not putting the entire command in the question, or use [ ] braces to signify the table name:

from [#tmp_CTF**]

if that is the table name.

How can I pretty-print JSON using Go?

For better memory usage, I guess this is better:

var out io.Writer
enc := json.NewEncoder(out)
enc.SetIndent("", "    ")
if err := enc.Encode(data); err != nil {
    panic(err)
}

How to suppress Pandas Future warning ?

Found this on github...

import warnings
warnings.simplefilter(action='ignore', category=FutureWarning)

import pandas

SQL Server - stop or break execution of a SQL script

Just use a RETURN (it will work both inside and outside a stored procedure).

C++ - Decimal to binary converting

std::bitset has a .to_string() method that returns a std::string holding a text representation in binary, with leading-zero padding.

Choose the width of the bitset as needed for your data, e.g. std::bitset<32> to get 32-character strings from 32-bit integers.

#include <iostream>
#include <bitset>

int main()
{
    std::string binary = std::bitset<8>(128).to_string(); //to binary
    std::cout<<binary<<"\n";

    unsigned long decimal = std::bitset<8>(binary).to_ulong();
    std::cout<<decimal<<"\n";
    return 0;
}

EDIT: Please do not edit my answer for Octal and Hexadecimal. The OP specifically asked for Decimal To Binary.

How to select all checkboxes with jQuery?

Top answer will not work in Jquery 1.9+ because of attr() method. Use prop() instead:

$(function() {
    $('#select_all').change(function(){
        var checkboxes = $(this).closest('form').find(':checkbox');
        if($(this).prop('checked')) {
          checkboxes.prop('checked', true);
        } else {
          checkboxes.prop('checked', false);
        }
    });
});

CSS transition fade in

I always prefer to use mixins for small CSS classes like fade in / out incase you want to use them in more than one class.

@mixin fade-in {
    opacity: 1;
    animation-name: fadeInOpacity;
    animation-iteration-count: 1;
    animation-timing-function: ease-in;
    animation-duration: 2s;
}

@keyframes fadeInOpacity {
    0% {
        opacity: 0;
    }
    100% {
        opacity: 1;
    }
}

and if you don't want to use mixins, you can create a normal class .fade-in.

file_put_contents(meta/services.json): failed to open stream: Permission denied

If you use Linux or Mac, even you can also run in ssh terminal. You can use terminal for run this command,

 php artisan cache:clear 
 sudo chmod -R 777 storage
 composer dump-autoload

If you are using windows, you can run using git bash.

 php artisan cache:clear 
 chmod -R 777 storage
 composer dump-autoload

You can download git form https://git-scm.com/downloads.

De-obfuscate Javascript code to make it readable again

Here's a new automated tool, JSNice, to try to deobfuscate/deminify it. The tool even tries to guess the variable names, which is unbelievably cool. (It mines Javascript on github for this purpose.)

http://www.jsnice.org

What are the uses of the exec command in shell scripts?

Just to augment the accepted answer with a brief newbie-friendly short answer, you probably don't need exec.

If you're still here, the following discussion should hopefully reveal why. When you run, say,

sh -c 'command'

you run a sh instance, then start command as a child of that sh instance. When command finishes, the sh instance also finishes.

sh -c 'exec command'

runs a sh instance, then replaces that sh instance with the command binary, and runs that instead.

Of course, both of these are useless in this limited context; you simply want

command

There are some fringe situations where you want the shell to read its configuration file or somehow otherwise set up the environment as a preparation for running command. This is pretty much the sole situation where exec command is useful.

#!/bin/sh
ENVIRONMENT=$(some complex task)
exec command

This does some stuff to prepare the environment so that it contains what is needed. Once that's done, the sh instance is no longer necessary, and so it's a (minor) optimization to simply replace the sh instance with the command process, rather than have sh run it as a child process and wait for it, then exit as soon as it finishes.

Similarly, if you want to free up as much resources as possible for a heavyish command at the end of a shell script, you might want to exec that command as an optimization.

If something forces you to run sh but you really wanted to run something else, exec something else is of course a workaround to replace the undesired sh instance (like for example if you really wanted to run your own spiffy gosh instead of sh but yours isn't listed in /etc/shells so you can't specify it as your login shell).

The second use of exec to manipulate file descriptors is a separate topic. The accepted answer covers that nicely; to keep this self-contained, I'll just defer to the manual for anything where exec is followed by a redirect instead of a command name.

Spring,Request method 'POST' not supported

I had csrf enabled in my sprint security xml file, so I just added one line in the form:

<input type="hidden" name="${_csrf.parameterName}" value="${_csrf.token}" /> 

This way I was able to submit the form having the model attribute.

How does one make random number between range for arc4random_uniform()?

Swift 3/4:

func randomNumber(range: ClosedRange<Int> = 1...6) -> Int {
    let min = range.lowerBound
    let max = range.upperBound
    return Int(arc4random_uniform(UInt32(1 + max - min))) + min
}

Looping each row in datagridview

Best aproach for me was:

  private void grid_receptie_CellFormatting(object sender, DataGridViewCellFormattingEventArgs e)
    {
        int X = 1;
        foreach(DataGridViewRow row in grid_receptie.Rows)
        {
            row.Cells["NR_CRT"].Value = X;
            X++;
        }
    }

Anaconda / Python: Change Anaconda Prompt User Path

Just Type the Drive Location you want to work with: This worked for me! For example you want to change to D drive in windows:

D:\

If you want to change to particular folder in the drive:

cd D:\Newfolder

How do I find the maximum of 2 numbers?

numberList=[16,19,42,43,74,66]

largest = numberList[0]

for num2 in numberList:

    if num2 > largest:

        largest=num2

print(largest)

gives largest number out of the numberslist without using a Max statement

How to add comments into a Xaml file in WPF?

Found a nice solution by Laurent Bugnion, it can look something like this:

<UserControl xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             xmlns:comment="Tag to add comments"
             mc:Ignorable="d comment" d:DesignHeight="300" d:DesignWidth="300">
    <Grid>
        <Button Width="100"
                comment:Width="example comment on Width, will be ignored......">
        </Button>
    </Grid>
</UserControl>

Here's the link: http://blog.galasoft.ch/posts/2010/02/quick-tip-commenting-out-properties-in-xaml/

A commenter on the link provided extra characters for the ignore prefix in lieu of highlighting:

mc:Ignorable=”ØignoreØ”

How to use jQuery with Angular?

A simple way:

1. include script

index.html

<script type="text/javascript" src="assets/js/jquery-2.1.1.min.js"></script>

2. declare

my.component.ts

declare var $: any;

3. use

@Component({
  selector: 'home',
  templateUrl: './my.component.html',
})
export class MyComponent implements OnInit {
 ...
  $("#myselector").style="display: none;";
}

How do I loop through items in a list box and then remove those item?

Here my solution without going backward and without a temporary list

while (listBox1.Items.Count > 0)
{
  string s = listBox1.Items[0] as string;
  // do something with s
  listBox1.Items.RemoveAt(0);
}

How to set timeout in Retrofit library?

For Retrofit1.9 with OkHttp3 users, here is the solution,

.setClient(new Ok3Client(new OkHttpClient.Builder().readTimeout(60, TimeUnit.SECONDS).build()))

-bash: syntax error near unexpected token `newline'

The characters '<', and '>', are to indicate a place-holder, you should remove them to read:

php /usr/local/solusvm/scripts/pass.php --type=admin --comm=change --username=ADMINUSERNAME

AngularJS error: 'argument 'FirstCtrl' is not a function, got undefined'

I got exactly the same error message and in my case it turned out i didn't list the controller JS file (e.g. first-ctrl.js) in my index.html

How to use multiple conditions (With AND) in IIF expressions in ssrs

You don't need an IIF() at all here. The comparisons return true or false anyway.

Also, since this row visibility is on a group row, make sure you use the same aggregate function on the fields as you use in the fields in the row. So if your group row shows sums, then you'd put this in the Hidden property.

=Sum(Fields!OpeningStock.Value) = 0 And
Sum(Fields!GrossDispatched.Value) = 0 And 
Sum(Fields!TransferOutToMW.Value) = 0 And
Sum(Fields!TransferOutToDW.Value) = 0 And
Sum(Fields!TransferOutToOW.Value) = 0 And
Sum(Fields!NetDispatched.Value) = 0 And
Sum(Fields!QtySold.Value) = 0 And
Sum(Fields!StockAdjustment.Value) = 0 And
Sum(Fields!ClosingStock.Value) = 0

But with the above version, if one record has value 1 and one has value -1 and all others are zero then sum is also zero and the row could be hidden. If that's not what you want you could write a more complex expression:

=Sum(
    IIF(
        Fields!OpeningStock.Value=0 AND
        Fields!GrossDispatched.Value=0 AND
        Fields!TransferOutToMW.Value=0 AND
        Fields!TransferOutToDW.Value=0 AND 
        Fields!TransferOutToOW.Value=0 AND
        Fields!NetDispatched.Value=0 AND
        Fields!QtySold.Value=0 AND
        Fields!StockAdjustment.Value=0 AND
        Fields!ClosingStock.Value=0,
        0,
        1
    )
) = 0

This is essentially a fancy way of counting the number of rows in which any field is not zero. If every field is zero for every row in the group then the expression returns true and the row is hidden.

C++ inheritance - inaccessible base?

You have to do this:

class Bar : public Foo
{
    // ...
}

The default inheritance type of a class in C++ is private, so any public and protected members from the base class are limited to private. struct inheritance on the other hand is public by default.

How to make canvas responsive

You can have a responsive canvas in 3 short and simple steps:

  1. Remove the width and height attributes from your <canvas>.

    <canvas id="responsive-canvas"></canvas>
    
  2. Using CSS, set the width of your canvas to 100%.

    #responsive-canvas {
      width: 100%;
    }
    
  3. Using JavaScript, set the height to some ratio of the width.

    var canvas = document.getElementById('responsive-canvas');
    var heightRatio = 1.5;
    canvas.height = canvas.width * heightRatio;
    

What is the correct way to write HTML using Javascript?

The document.write method is very limited. You can only use it before the page has finished loading. You can't use it to update the contents of a loaded page.

What you probably want is innerHTML.

How can I get the length of text entered in a textbox using jQuery?

If your textbox has an id attribute of "mytextbox", then you can get the length like this:

var myLength = $("#mytextbox").val().length;
  • $("#mytextbox") finds the textbox by its id.
  • .val() gets the value of the input element entered by the user, which is a string.
  • .length gets the number of characters in the string.

Jenkins: Can comments be added to a Jenkinsfile?

The official Jenkins documentation only mentions single line commands like the following:

// Declarative //

and (see)

pipeline {
    /* insert Declarative Pipeline here */
}

The syntax of the Jenkinsfile is based on Groovy so it is also possible to use groovy syntax for comments. Quote:

/* a standalone multiline comment
   spanning two lines */
println "hello" /* a multiline comment starting
                   at the end of a statement */
println 1 /* one */ + 2 /* two */

or

/**
 * such a nice comment
 */

How to append one file to another in Linux from the shell?

Another solution:

cat file1 | tee -a file2

tee has the benefit that you can append to as many files as you like, for example:

cat file1 | tee -a file2 file3 file3

will append the contents of file1 to file2, file3 and file4.

From the man page:

-a, --append
       append to the given FILEs, do not overwrite

How to insert a row in an HTML table body in JavaScript

I think this script is what exactly you need

var t = document.getElementById('myTable');
var r =document.createElement('TR');
t.tBodies[0].appendChild(r)

Calculating the position of points in a circle

Here is an R version based on the @Pirijan answer above.

points <- 8
radius <- 10
center_x <- 5
center_y <- 5

drawCirclePoints <- function(points, radius, center_x, center_y) {
  slice <- 2 * pi / points
  angle <- slice * seq(0, points, by = 1)

  newX <- center_x + radius * cos(angle)
  newY <- center_y + radius * sin(angle)

  plot(newX, newY)
}

drawCirclePoints(points, radius, center_x, center_y)

Read a text file line by line in Qt

Here's the example from my code. So I will read a text from 1st line to 3rd line using readLine() and then store to array variable and print into textfield using for-loop :

QFile file("file.txt");

    if(!file.open(QIODevice::ReadOnly | QIODevice::Text))
        return;

    QTextStream in(&file);
    QString line[3] = in.readLine();
    for(int i=0; i<3; i++)
    {
        ui->textEdit->append(line[i]);
    }

Disable password authentication for SSH

In file /etc/ssh/sshd_config

# Change to no to disable tunnelled clear text passwords
#PasswordAuthentication no

Uncomment the second line, and, if needed, change yes to no.

Then run

service ssh restart

Root password inside a Docker container

try the following command to get the root access

$ sudo -i 

How to check if a service is running on Android?

Xamarin C# version:

private bool isMyServiceRunning(System.Type cls)
{
    ActivityManager manager = (ActivityManager)GetSystemService(Context.ActivityService);

    foreach (var service in manager.GetRunningServices(int.MaxValue)) {
        if (service.Service.ClassName.Equals(Java.Lang.Class.FromType(cls).CanonicalName)) {
            return true;
        }
    }
    return false;
}

Cannot enqueue Handshake after invoking quit

AWS Lambda functions

Use mysql.createPool() with connection.destroy()

This way, new invocations use the established pool, but don't keep the function running. Even though you don't get the full benefit of pooling (each new connection uses a new connection instead of an existing one), it makes it so that a second invocation can establish a new connection without the previous one having to be closed first.

Regarding connection.end()

This can cause a subsequent invocation to throw an error. The invocation will still retry later and work, but with a delay.

Regarding mysql.createPool() with connection.release()

The Lambda function will keep running until the scheduled timeout, as there is still an open connection.

Code example

const mysql = require('mysql');

const pool = mysql.createPool({
  connectionLimit: 100,
  host:     process.env.DATABASE_HOST,
  user:     process.env.DATABASE_USER,
  password: process.env.DATABASE_PASSWORD,
});

exports.handler = (event) => {
  pool.getConnection((error, connection) => {
    if (error) throw error;
    connection.query(`
      INSERT INTO table_name (event) VALUES ('${event}')
    `, function(error, results, fields) {
      if (error) throw error;
      connection.destroy();
    });
  });
};

Get generic type of class at runtime

Here is working solution!!!

@SuppressWarnings("unchecked")
    private Class<T> getGenericTypeClass() {
        try {
            String className = ((ParameterizedType) getClass().getGenericSuperclass()).getActualTypeArguments()[0].getTypeName();
            Class<?> clazz = Class.forName(className);
            return (Class<T>) clazz;
        } catch (Exception e) {
            throw new IllegalStateException("Class is not parametrized with generic type!!! Please use extends <> ");
        }
    } 

NOTES: Can be used only as superclass
1. Has to be extended with typed class (Child extends Generic<Integer>)
OR

2. Has to be created as anonymous implementation (new Generic<Integer>() {};)

Declaring multiple variables in JavaScript

Maybe like this

var variable1 = "Hello, World!"
, variable2 = 2
, variable3 = "How are you doing?"
, variable4 = 42;

Except when changing the first or last variable, it is easy to maintain and read.

Multiple Cursors in Sublime Text 2 Windows

In Sublime Text, after you select multiple regions of text, a click is considered a way to exit the multi-select mode. Move the cursor with the keyboard keys (arrows, Ctrl+arrows, etc.) instead, and you'll be fine

String concatenation in Ruby

For Puppet:

$username = 'lala'
notify { "Hello ${username.capitalize}":
    withpath => false,
}

What does the term "Tuple" Mean in Relational Databases?

As I understand it a table has a set K of keys and a typing function T with domain K. A row, or "tuple", of the table is a function r with domain K such that r(k) is an element of T(k) for each key k. So the terminology is misleading in that a "tuple" is really more like an associative array.

What is the difference between ArrayList.clear() and ArrayList.removeAll()?

The time complexity of ArrayList.clear() is O(n) and of removeAll is O(n^2).

So yes, ArrayList.clear is much faster.

EF LINQ include multiple and nested entities

One may write an extension method like this:

    /// <summary>
    /// Includes an array of navigation properties for the specified query 
    /// </summary>
    /// <typeparam name="T">The type of the entity</typeparam>
    /// <param name="query">The query to include navigation properties for that</param>
    /// <param name="navProperties">The array of navigation properties to include</param>
    /// <returns></returns>
    public static IQueryable<T> Include<T>(this IQueryable<T> query, params string[] navProperties)
        where T : class
    {
        foreach (var navProperty in navProperties)
            query = query.Include(navProperty);

        return query;
    }

And use it like this even in a generic implementation:

string[] includedNavigationProperties = new string[] { "NavProp1.SubNavProp", "NavProp2" };

var query = context.Set<T>()
.Include(includedNavigationProperties);

For div to extend full height

This might be of some help: http://www.webmasterworld.com/forum83/200.htm

A relevant quote:

Most attempts to accomplish this were made by assigning the property and value: div{height:100%} - this alone will not work. The reason is that without a parent defined height, the div{height:100%;} has nothing to factor 100% percent of, and will default to a value of div{height:auto;} - auto is an "as needed value" which is governed by the actual content, so that the div{height:100%} will a=only extend as far as the content demands.

The solution to the problem is found by assigning a height value to the parent container, in this case, the body element. Writing your body stlye to include height 100% supplies the needed value.

html, body { 
  margin:0; 
  padding:0; 
  height:100%; 
}

Change the project theme in Android Studio?

In Manifest theme sets with style name (AppTheme and myDialog)/ You can set new styles in styles.xml

        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <activity
        android:name=".MyActivity2"
        android:label="@string/title_activity_my_activity2"
        android:theme="@style/myDialog"
        >
    </activity>
</application>

styles.xml example

<resources>

<!-- Base application theme. -->
<style name="AppTheme" parent="android:Theme.Black">
    <!-- Customize your theme here. -->
</style>

<style name="myDialog" parent="android:Theme.Dialog">

</style>

In parent you set actualy the theme

Difference between window.location.href and top.location.href

The first one adds an item to your history in that you can (or should be able to) click "Back" and go back to the current page.

The second replaces the current history item so you can't go back to it.

See window.location:

  • assign(url): Load the document at the provided URL.

  • replace(url): Replace the current document with the one at the provided URL. The difference from the assign() method is that after using replace() the current page will not be saved in session history, meaning the user won't be able to use the Back button to navigate to it.

window.location.href = url;

is favoured over:

window.location = url;

Can't create project on Netbeans 8.2

Faced same issue with jdk 10. While installing netbeans prompted for jdk default location was taken as jdk 10. This was the issue, it should be jdk8 (1.8).

  1. Close Netbeans
  2. Open below file
    C:\Program Files\NetBeans 8.2\etc\netbeans.conf
  3. Comment jdkhome line jdk9 or jdk10 with # sign:
    # netbeans_jdkhome="C:\Program Files\Java\jdk-10.0.1"
  4. Add new jdkhome line for jdk8:
    netbeans_jdkhome="C:\Program Files\Java\jdk1.8.0_171"
  5. Start Netbeans

Note: If the above .conf file is not editable, then use Administrator mode. I use Notepad++, it prompted for restarting Notepad++ in Administrator mode, then save worked fine.

Set QLineEdit to accept only numbers

You could also set an inputMask:

QLineEdit.setInputMask("9")

This allows the user to type only one digit ranging from 0 to 9. Use multiple 9's to allow the user to enter multiple numbers. See also the complete list of characters that can be used in an input mask.

(My answer is in Python, but it should not be hard to transform it to C++)

access key and value of object using *ngFor

Update

In 6.1.0-beta.1 KeyValuePipe was introduced https://github.com/angular/angular/pull/24319

<div *ngFor="let item of {'b': 1, 'a': 1} | keyvalue">
  {{ item.key }} - {{ item.value }}
</div>

Plunker Example

Previous version

Another approach is to create NgForIn directive that will be used like:

<div *ngFor="let key in obj">
   <b>{{ key }}</b>: {{ obj[key] }}
</div>

Plunker Example

ngforin.directive.ts

@Directive({
  selector: '[ngFor][ngForIn]'
})
export class NgForIn<T> extends NgForOf<T> implements OnChanges {

  @Input() ngForIn: any;

  ngOnChanges(changes: NgForInChanges): void {
    if (changes.ngForIn) {
      this.ngForOf = Object.keys(this.ngForIn) as Array<any>;

      const change = changes.ngForIn;
      const currentValue = Object.keys(change.currentValue);
      const previousValue = change.previousValue ? Object.keys(change.previousValue) : undefined;
      changes.ngForOf =  new SimpleChange(previousValue, currentValue, change.firstChange);

      super.ngOnChanges(changes);
    }
  }
}

Printing pointers in C

"s" is not a "char*", it's a "char[4]". And so, "&s" is not a "char**", but actually "a pointer to an array of 4 characater". Your compiler may treat "&s" as if you had written "&s[0]", which is roughly the same thing, but is a "char*".

When you write "char** p = &s;" you are trying to say "I want p to be set to the address of the thing which currently points to "asd". But currently there is nothing which points to "asd". There is just an array which holds "asd";

char s[] = "asd";
char *p = &s[0];  // alternately you could use the shorthand char*p = s;
char **pp = &p;

Cannot bulk load. Operating system error code 5 (Access is denied.)

Make sure the file you're using ('C:\Users\Michael\workspace\pydb\data\andrew.out.txt') is on the SQL server machine and not the client machine running MSSMS.

Serving static web resources in Spring Boot & Spring Security application

@Configuration
@EnableWebSecurity
public class WebSecurityConfig extends WebSecurityConfigurerAdapter {

    @Override
    protected void configure(HttpSecurity http) throws Exception {

        String[] resources = new String[]{
                "/", "/home","/pictureCheckCode","/include/**",
                "/css/**","/icons/**","/images/**","/js/**","/layer/**"
        };

        http.authorizeRequests()
                .antMatchers(resources).permitAll()
                .anyRequest().authenticated()
                .and()
            .formLogin()
                .loginPage("/login")
                .permitAll()
                .and()
            .logout().logoutUrl("/404")
                .permitAll();
        super.configure(http);
    }
}

What does 'URI has an authority component' mean?

I found out that the URL of the application conflicted with a module in the Sun GlassFish. So, in the file sun-web.xml I renamed the <context-root>/servlets-samples</context-root>.

It is now working.

Run a php app using tomcat?

There this PHP/Java bridge. This is basically running PHP via FastCGI. I have not used it myself.

What's the difference between passing by reference vs. passing by value?

Pass by value sends a COPY of the data stored in the variable you specify, pass by reference sends a direct link to the variable itself. So if you pass a variable by reference and then change the variable inside the block you passed it into, the original variable will be changed. If you simply pass by value, the original variable will not be able to be changed by the block you passed it into but you will get a copy of whatever it contained at the time of the call.

How to keep keys/values in same order as declared?

Another alternative is to use Pandas dataframe as it guarantees the order and the index locations of the items in a dict-like structure.

How to remove all white space from the beginning or end of a string?

string a = "   Hello   ";
string trimmed = a.Trim();

trimmed is now "Hello"

Android: Vertical alignment for multi line EditText (Text area)

This is similar to CommonsWare answer but with a minor tweak: android:gravity="top|start". Complete code example:

<EditText
    android:id="@+id/EditText02"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:lines="5"
    android:gravity="top|start"
    android:inputType="textMultiLine"
    android:scrollHorizontally="false" 
/>

Named placeholders in string formatting

This is an old thread, but just for the record, you could also use Java 8 style, like this:

public static String replaceParams(Map<String, String> hashMap, String template) {
    return hashMap.entrySet().stream().reduce(template, (s, e) -> s.replace("%(" + e.getKey() + ")", e.getValue()),
            (s, s2) -> s);
}

Usage:

public static void main(String[] args) {
    final HashMap<String, String> hashMap = new HashMap<String, String>() {
        {
            put("foo", "foo1");
            put("bar", "bar1");
            put("car", "BMW");
            put("truck", "MAN");
        }
    };
    String res = replaceParams(hashMap, "This is '%(foo)' and '%(foo)', but also '%(bar)' '%(bar)' indeed.");
    System.out.println(res);
    System.out.println(replaceParams(hashMap, "This is '%(car)' and '%(foo)', but also '%(bar)' '%(bar)' indeed."));
    System.out.println(replaceParams(hashMap, "This is '%(car)' and '%(truck)', but also '%(foo)' '%(bar)' + '%(truck)' indeed."));
}

The output will be:

This is 'foo1' and 'foo1', but also 'bar1' 'bar1' indeed.
This is 'BMW' and 'foo1', but also 'bar1' 'bar1' indeed.
This is 'BMW' and 'MAN', but also 'foo1' 'bar1' + 'MAN' indeed.

Python: Assign print output to a variable

The print statement in Python converts its arguments to strings, and outputs those strings to stdout. To save the string to a variable instead, only convert it to a string:

a = str(tag.getArtist())

SQL statement to get column type

Another option for MS SQL is to replace the select query here with the query you want the types for:

declare @sql varchar(4000);

set @sql = 'select ''hi'' as greeting';

select * from master.sys.dm_exec_describe_first_result_set (@sql, Null, 0);

How to get date, month, year in jQuery UI datepicker?

what about that simple way)

$(document).ready ->
 $('#datepicker').datepicker( dateFormat: 'yy-mm-dd',  onSelect: (dateStr) ->
    alert dateStr # yy-mm-dd
    #OR
    alert $("#datepicker").val(); # yy-mm-dd

How to configure postgresql for the first time?

This is my solution:

su root
su postgres
psql

'str' object does not support item assignment in Python

Python strings are immutable so what you are trying to do in C will be simply impossible in python. You will have to create a new string.

I would like to read some characters from a string and put it into other string.

Then use a string slice:

>>> s1 = 'Hello world!!'
>>> s2 = s1[6:12]
>>> print s2
world!

finding the type of an element using jQuery

It is worth noting that @Marius's second answer could be used as pure Javascript solution.

document.getElementById('elementId').tagName

Streaming a video file to an html5 video player with Node.js so that the video controls continue to work?

The Accept Ranges header (the bit in writeHead()) is required for the HTML5 video controls to work.

I think instead of just blindly send the full file, you should first check the Accept Ranges header in the REQUEST, then read in and send just that bit. fs.createReadStream support start, and end option for that.

So I tried an example and it works. The code is not pretty but it is easy to understand. First we process the range header to get the start/end position. Then we use fs.stat to get the size of the file without reading the whole file into memory. Finally, use fs.createReadStream to send the requested part to the client.

var fs = require("fs"),
    http = require("http"),
    url = require("url"),
    path = require("path");

http.createServer(function (req, res) {
  if (req.url != "/movie.mp4") {
    res.writeHead(200, { "Content-Type": "text/html" });
    res.end('<video src="http://localhost:8888/movie.mp4" controls></video>');
  } else {
    var file = path.resolve(__dirname,"movie.mp4");
    fs.stat(file, function(err, stats) {
      if (err) {
        if (err.code === 'ENOENT') {
          // 404 Error if file not found
          return res.sendStatus(404);
        }
      res.end(err);
      }
      var range = req.headers.range;
      if (!range) {
       // 416 Wrong range
       return res.sendStatus(416);
      }
      var positions = range.replace(/bytes=/, "").split("-");
      var start = parseInt(positions[0], 10);
      var total = stats.size;
      var end = positions[1] ? parseInt(positions[1], 10) : total - 1;
      var chunksize = (end - start) + 1;

      res.writeHead(206, {
        "Content-Range": "bytes " + start + "-" + end + "/" + total,
        "Accept-Ranges": "bytes",
        "Content-Length": chunksize,
        "Content-Type": "video/mp4"
      });

      var stream = fs.createReadStream(file, { start: start, end: end })
        .on("open", function() {
          stream.pipe(res);
        }).on("error", function(err) {
          res.end(err);
        });
    });
  }
}).listen(8888);

Make a VStack fill the width of the screen in SwiftUI

There is a better way!

To make the VStack fill the width of it's parent you can use a GeometryReader and set the frame. (.relativeWidth(1.0) should work but apparently doesn't right now)

struct ContentView : View {
    var body: some View {
        GeometryReader { geometry in
            VStack {
                Text("test")
            }
                .frame(width: geometry.size.width,
                       height: nil,
                       alignment: .topLeading)
        }
    }
}

To make the VStack the width of the actual screen you can use UIScreen.main.bounds.width when setting the frame instead of using a GeometryReader, but I imagine you likely wanted the width of the parent view.

Also, this way has the added benefit of not adding spacing in your VStack which might happen (if you have spacing) if you added an HStack with a Spacer() as it's content to the VStack.

UPDATE - THERE IS NOT A BETTER WAY!

After checking out the accepted answer, I realized that the accepted answer doesn't actually work! It appears to work at first glance, but if you update the VStack to have a green background you'll notice the VStack is still the same width.

struct ContentView : View {
    var body: some View {
        NavigationView {
            VStack(alignment: .leading) {
                Text("Hello World")
                    .font(.title)
                Text("Another")
                    .font(.body)
                Spacer()
                }
                .background(Color.green)
                .frame(minWidth: 0, maxWidth: .infinity, minHeight: 0, maxHeight: .infinity, alignment: .topLeading)
                .background(Color.red)
        }
    }
}

This is because .frame(...) is actually adding another view to the view hierarchy and that view ends up filling the screen. However, the VStack still does not.

This issue also seems to be the same in my answer as well and can be checked using the same approach as above (putting different background colors before and after the .frame(...). The only way that appears to actually widen the VStack is to use spacers:

struct ContentView : View {
    var body: some View {
        VStack(alignment: .leading) {
            HStack{
                Text("Title")
                    .font(.title)
                Spacer()
            }
            Text("Content")
                .lineLimit(nil)
                .font(.body)
            Spacer()
        }
            .background(Color.green)
    }
}

File input 'accept' attribute - is it useful?

Yes, it is extremely useful in browsers that support it, but the "limiting" is as a convenience to users (so they are not overwhelmed with irrelevant files) rather than as a way to prevent them from uploading things you don't want them uploading.

It is supported in

  • Chrome 16 +
  • Safari 6 +
  • Firefox 9 +
  • IE 10 +
  • Opera 11 +

Here is a list of content types you can use with it, followed by the corresponding file extensions (though of course you can use any file extension):

application/envoy   evy
application/fractals    fif
application/futuresplash    spl
application/hta hta
application/internet-property-stream    acx
application/mac-binhex40    hqx
application/msword  doc
application/msword  dot
application/octet-stream    *
application/octet-stream    bin
application/octet-stream    class
application/octet-stream    dms
application/octet-stream    exe
application/octet-stream    lha
application/octet-stream    lzh
application/oda oda
application/olescript   axs
application/pdf pdf
application/pics-rules  prf
application/pkcs10  p10
application/pkix-crl    crl
application/postscript  ai
application/postscript  eps
application/postscript  ps
application/rtf rtf
application/set-payment-initiation  setpay
application/set-registration-initiation setreg
application/vnd.ms-excel    xla
application/vnd.ms-excel    xlc
application/vnd.ms-excel    xlm
application/vnd.ms-excel    xls
application/vnd.ms-excel    xlt
application/vnd.ms-excel    xlw
application/vnd.ms-outlook  msg
application/vnd.ms-pkicertstore sst
application/vnd.ms-pkiseccat    cat
application/vnd.ms-pkistl   stl
application/vnd.ms-powerpoint   pot
application/vnd.ms-powerpoint   pps
application/vnd.ms-powerpoint   ppt
application/vnd.ms-project  mpp
application/vnd.ms-works    wcm
application/vnd.ms-works    wdb
application/vnd.ms-works    wks
application/vnd.ms-works    wps
application/winhlp  hlp
application/x-bcpio bcpio
application/x-cdf   cdf
application/x-compress  z
application/x-compressed    tgz
application/x-cpio  cpio
application/x-csh   csh
application/x-director  dcr
application/x-director  dir
application/x-director  dxr
application/x-dvi   dvi
application/x-gtar  gtar
application/x-gzip  gz
application/x-hdf   hdf
application/x-internet-signup   ins
application/x-internet-signup   isp
application/x-iphone    iii
application/x-javascript    js
application/x-latex latex
application/x-msaccess  mdb
application/x-mscardfile    crd
application/x-msclip    clp
application/x-msdownload    dll
application/x-msmediaview   m13
application/x-msmediaview   m14
application/x-msmediaview   mvb
application/x-msmetafile    wmf
application/x-msmoney   mny
application/x-mspublisher   pub
application/x-msschedule    scd
application/x-msterminal    trm
application/x-mswrite   wri
application/x-netcdf    cdf
application/x-netcdf    nc
application/x-perfmon   pma
application/x-perfmon   pmc
application/x-perfmon   pml
application/x-perfmon   pmr
application/x-perfmon   pmw
application/x-pkcs12    p12
application/x-pkcs12    pfx
application/x-pkcs7-certificates    p7b
application/x-pkcs7-certificates    spc
application/x-pkcs7-certreqresp p7r
application/x-pkcs7-mime    p7c
application/x-pkcs7-mime    p7m
application/x-pkcs7-signature   p7s
application/x-sh    sh
application/x-shar  shar
application/x-shockwave-flash   swf
application/x-stuffit   sit
application/x-sv4cpio   sv4cpio
application/x-sv4crc    sv4crc
application/x-tar   tar
application/x-tcl   tcl
application/x-tex   tex
application/x-texinfo   texi
application/x-texinfo   texinfo
application/x-troff roff
application/x-troff t
application/x-troff tr
application/x-troff-man man
application/x-troff-me  me
application/x-troff-ms  ms
application/x-ustar ustar
application/x-wais-source   src
application/x-x509-ca-cert  cer
application/x-x509-ca-cert  crt
application/x-x509-ca-cert  der
application/ynd.ms-pkipko   pko
application/zip zip
audio/basic au
audio/basic snd
audio/mid   mid
audio/mid   rmi
audio/mpeg  mp3
audio/x-aiff    aif
audio/x-aiff    aifc
audio/x-aiff    aiff
audio/x-mpegurl m3u
audio/x-pn-realaudio    ra
audio/x-pn-realaudio    ram
audio/x-wav wav
image/bmp   bmp
image/cis-cod   cod
image/gif   gif
image/ief   ief
image/jpeg  jpe
image/jpeg  jpeg
image/jpeg  jpg
image/pipeg jfif
image/svg+xml   svg
image/tiff  tif
image/tiff  tiff
image/x-cmu-raster  ras
image/x-cmx cmx
image/x-icon    ico
image/x-portable-anymap pnm
image/x-portable-bitmap pbm
image/x-portable-graymap    pgm
image/x-portable-pixmap ppm
image/x-rgb rgb
image/x-xbitmap xbm
image/x-xpixmap xpm
image/x-xwindowdump xwd
message/rfc822  mht
message/rfc822  mhtml
message/rfc822  nws
text/css    css
text/h323   323
text/html   htm
text/html   html
text/html   stm
text/iuls   uls
text/plain  bas
text/plain  c
text/plain  h
text/plain  txt
text/richtext   rtx
text/scriptlet  sct
text/tab-separated-values   tsv
text/webviewhtml    htt
text/x-component    htc
text/x-setext   etx
text/x-vcard    vcf
video/mpeg  mp2
video/mpeg  mpa
video/mpeg  mpe
video/mpeg  mpeg
video/mpeg  mpg
video/mpeg  mpv2
video/quicktime mov
video/quicktime qt
video/x-la-asf  lsf
video/x-la-asf  lsx
video/x-ms-asf  asf
video/x-ms-asf  asr
video/x-ms-asf  asx
video/x-msvideo avi
video/x-sgi-movie   movie
x-world/x-vrml  flr
x-world/x-vrml  vrml
x-world/x-vrml  wrl
x-world/x-vrml  wrz
x-world/x-vrml  xaf
x-world/x-vrml  xof

How do you split and unsplit a window/view in Eclipse IDE?

This is possible with the menu items Window>Editor>Toggle Split Editor.

Current shortcut for splitting is:

Azerty keyboard:

  • Ctrl + _ for split horizontally, and
  • Ctrl + { for split vertically.

Qwerty US keyboard:

  • Ctrl + Shift + - (accessing _) for split horizontally, and
  • Ctrl + Shift + [ (accessing {) for split vertically.

MacOS - Qwerty US keyboard:

  • + Shift + - (accessing _) for split horizontally, and
  • + Shift + [ (accessing {) for split vertically.

On any other keyboard if a required key is unavailable (like { on a german Qwertz keyboard), the following generic approach may work:

  • Alt + ASCII code + Ctrl then release Alt

Example: ASCII for '{' = 123, so press 'Alt', '1', '2', '3', 'Ctrl' and release 'Alt', effectively typing '{' while 'Ctrl' is pressed, to split vertically.

Example of vertical split:

https://bugs.eclipse.org/bugs/attachment.cgi?id=238285

PS:

  • The menu items Window>Editor>Toggle Split Editor were added with Eclipse Luna 4.4 M4, as mentioned by Lars Vogel in "Split editor implemented in Eclipse M4 Luna"
  • The split editor is one of the oldest and most upvoted Eclipse bug! Bug 8009
  • The split editor functionality has been developed in Bug 378298, and will be available as of Eclipse Luna M4. The Note & Newsworthy of Eclipse Luna M4 will contain the announcement.

How to connect to a secure website using SSL in Java with a pkcs12 file?

It appears that you are extracting you certificate from the PKCS #12 key store and creating a new Java key store (with type "JKS"). You don't strictly have to provide a trust store password (although using one allows you to test the integrity of your root certificates).

So, try your program with only the following SSL properties set. The list shown in your question is over-specified and may be causing problems.

System.setProperty("javax.net.ssl.trustStore", "myTrustStore");
System.setProperty("javax.net.ssl.trustStorePassword", "changeit");

Also, using the PKCS #12 file directly as the trust store should work, as long as the CA certificate is detected as a "trusted" entry. But in that case, you'll have to specify the javax.net.ssl.trustStoreType property as "PKCS12" too.

Try with these properties only. If you get the same error, I suspect your problem is not the key store. If it still occurs, post more of the stack trace in your question to narrow the problem down.


The new error, "the trustAnchors parameter must be non-empty," could be due to setting the javax.net.ssl.trustStore property to a file that doesn't exist; if the file cannot be opened, an empty key store created, which would lead to this error.

How to open spss data files in excel?

You can use online converter, developed by me at N'counter.

This is the easiest way to open SPSS file in Excel.

1) You just have to upload your file to SPSS coN'verter at https://secure.ncounter.de/SpssConverter

2) Select some options

3) And your converted Excel file will be downloaded

No information about your file contents is retained on our server. The file travels to our server, is converted in-memory, and is immediately discarded: We don't peer into your data at any time!

Looking for a 'cmake clean' command to clear up CMake output

To simplify cleaning when using "out of source" build (i.e. you build in the build directory), I use the following script:

$ cat ~/bin/cmake-clean-build
#!/bin/bash

if [ -d ../build ]; then
    cd ..
    rm -rf build
    mkdir build
    cd build
else
    echo "build directory DOES NOT exist"
fi

Every time you need to clean up, you should source this script from the build directory:

. cmake-clean-build

How to instantiate a javascript class in another js file?

Possible Suggestions to make it work:

Some modifications (U forgot to include a semicolon in the statement this.getName=function(){...} it should be this.getName=function(){...};)

function Customer(){
this.name="Jhon";
this.getName=function(){
return this.name;
};
}

(This might be one of the problem.)

and

Make sure U Link the JS files in the correct order

<script src="file1.js" type="text/javascript"></script>
<script src="file2.js" type="text/javascript"></script>

Convert image from PIL to openCV format

use this:

pil_image = PIL.Image.open('Image.jpg').convert('RGB') 
open_cv_image = numpy.array(pil_image) 
# Convert RGB to BGR 
open_cv_image = open_cv_image[:, :, ::-1].copy() 

Pass a datetime from javascript to c# (Controller)

try this

var date = new Date();    
$.ajax(
   {
       type: "POST",
       url: "/Group/Refresh",
       contentType: "application/json; charset=utf-8",
       data: "{ 'MyDate': " + date.getTimezoneOffset() + " }",
       success: function (result) {
           //do something
       },
       error: function (req, status, error) {
           //error                        
       }
   });

In C#

DateTime.Now.ToUniversalTime().AddMinutes(double.Parse(MyDate)).ToString();

How to get the squared symbol (²) to display in a string

Not sure what kind of text box you are refering to. However, I'm not sure if you can do this in a text box on a user form.

A text box on a sheet you can though.

Sheets("Sheet1").Shapes("TextBox 1").TextFrame2.TextRange.Text = "R2=" & variable
Sheets("Sheet1").Shapes("TextBox 1").TextFrame2.TextRange.Characters(2, 1).Font.Superscript = msoTrue

And same thing for an excel cell

Sheets("Sheet1").Range("A1").Characters(2, 1).Font.Superscript = True

If this isn't what you're after you will need to provide more information in your question.

EDIT: posted this after the comment sorry

How can I mix LaTeX in with Markdown?

Have you tried with Pandoc?

EDIT:

Although the documentation has become a bit complex, pandoc has supported inline LaTeX and LaTeX templates for 10 years.

Documents like the following one can be written in Markdown:

---
title: Just say hello!
author: My Friend
header-includes: |
    \usepackage{tikz,pgfplots}
    \usepackage{fancyhdr}
    \pagestyle{fancy}
    \fancyhead[CO,CE]{This is fancy}
    \fancyfoot[CO,CE]{So is this}
    \fancyfoot[LE,RO]{\thepage}
abstract: This is a pandoc test with Markdown + inline LaTeX
---

Just say hello!
===============

This could be a good example or inlined \LaTeX:

\begin{tikzpicture}
\begin{axis}
\addplot[color=red]{exp(x)};
\end{axis}
\end{tikzpicture}
%Here ends the furst plot
\hskip 5pt
%Here begins the 3d plot
\begin{tikzpicture}
\begin{axis}
\addplot3[
    surf,
]
{exp(-x^2-y^2)*x};
\end{axis}
\end{tikzpicture}

And now, just a few words to terminate:

> Goodbye folks!

Which can be converted to LaTeX using commands like this: pandoc -s -i Hello.md -o Hello.tex

Following is an image of the converted Hello.md to Hello.pdf file using MiKTeX as LaTeX processor with the command: pandoc -s -i Hello.md -o Hello.pdf

enter image description here

Finally, there are some open source LaTeX templates like this one: https://github.com/Wandmalfarbe/pandoc-latex-template, that can be used for better formatting.

As always, the reader should dig deeper if he has less trivial use cases than presented here.

date format yyyy-MM-ddTHH:mm:ssZ

It works fine with Salesforce REST API query datetime formats

DateTime now = DateTime.UtcNow;
string startDate = now.AddDays(-5).ToString("yyyy-MM-ddTHH\\:mm\\:ssZ");   
string endDate = now.ToString("yyyy-MM-ddTHH\\:mm\\:ssZ");  
//REST service Query 
string salesforceUrl= https://csxx.salesforce.com//services/data/v33.0/sobjects/Account/updated/?start=" + startDate + "&end=" + endDate;

// https://csxx.salesforce.com/services/data/v33.0/sobjects/Account/updated/?start=2015-03-10T15:15:57Z&end=2015-03-15T15:15:57Z

It returns the results from Salesforce without any issues.

What is log4j's default log file dumping path

By default, Log4j logs to standard output and that means you should be able to see log messages on your Eclipse's console view. To log to a file you need to use a FileAppender explicitly by defining it in a log4j.properties file in your classpath.

Create the following log4j.properties file in your classpath. This allows you to log your message to both a file as well as your console.

log4j.rootLogger=debug, stdout, file

log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout

# Pattern to output the caller's file name and line number.
log4j.appender.stdout.layout.ConversionPattern=%5p [%t] (%F:%L) - %m%n

log4j.appender.file=org.apache.log4j.FileAppender
log4j.appender.file.File=example.log
log4j.appender.file.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern=%p %t %c - %m%n

Note: The above creates an example.log in your current working directory (i.e. Eclipse's project directory) so that the same log4j.properties could work with different projects without overwriting each other's logs.

References:
Apache log4j 1.2 - Short introduction to log4j

Bootstrap 3 - Set Container Width to 940px Maximum for Desktops?

In the first place consider the Small grid, see: http://getbootstrap.com/css/#grid-options. A max container width of 750 px will maybe to small for you (also read: Why does Bootstrap 3 force the container width to certain sizes?)

When using the Small grid use media queries to set the max-container width:

@media (min-width: 768px) { .container { max-width: 750px; } }

Second also read this question: Bootstrap 3 - 940px width grid?, possible duplicate?

12 x 60 = 720px for the columns and 11 x 20 = 220px

there will also a gutter of 20px on both sides of the grid so 220 + 720 + 40 makes 980px

there is 'no' @ColumnWidth

You colums width will be calculated dynamically based on your settings in variables.less. you could set @grid-columns and @grid-gutter-width. The width of a column will be set as a percentage via grid.less in mixins.less:

.calc-grid(@index, @class, @type) when (@type = width) {
  .col-@{class}-@{index} {
    width: percentage((@index / @grid-columns));
  }
}

update Set @grid-gutter-width to 20px;, @container-desktop: 940px;, @container-large-desktop: @container-desktop and recompile bootstrap.

Basic Apache commands for a local Windows machine

For frequent uses of this command I found it easy to add the location of C:\xampp\apache\bin to the PATH. Use whatever directory you have this installed in.

Then you can run from any directory in command line:

httpd -k restart

The answer above that suggests httpd -k -restart is actually a typo. You can see the commands by running httpd /?

how can get index & count in vuejs

this might be a dirty code but i think it can suffice

<div v-for="(counter in counters">
{{ counter }}) {{ userlist[counter-1].name }}
</div>

on your script add this one

data(){return {userlist: [],user_id: '',counters: 0,edit: false,}},

Get index of current item in a PowerShell loop

.NET has some handy utility methods for this sort of thing in System.Array:

PS> $a = 'a','b','c'
PS> [array]::IndexOf($a, 'b')
1
PS> [array]::IndexOf($a, 'c')
2

Good points on the above approach in the comments. Besides "just" finding an index of an item in an array, given the context of the problem, this is probably more suitable:

$letters = { 'A', 'B', 'C' }
$letters | % {$i=0} {"Value:$_ Index:$i"; $i++}

Foreach (%) can have a Begin sciptblock that executes once. We set an index variable there and then we can reference it in the process scripblock where it gets incremented before exiting the scriptblock.

How to align td elements in center

I personally didn't find any of these answers helpful. What worked in my case was giving the element float:none and position:relative. After that the element centered itself in the <td>.

How do I display todays date on SSRS report?

Just simple use

=Format(today(), "dd/MM/yyyy")

will solve your problem.

How can I extract all values from a dictionary in Python?

If you want all of the values, use this:

dict_name_goes_here.values()

Delaying a jquery script until everything else has loaded

Multiple $(document).ready() will fire in order top down on the page. The last $(document).ready() will fire last on the page. Inside the last $(document).ready(), you can trigger a new custom event to fire after all the others..

Wrap your code in an event handler for the new custom event.

<html>
<head>
<script>
    $(document).on("my-event-afterLastDocumentReady", function () {
        // Fires LAST
    });
    $(document).ready(function() {
        // Fires FIRST
    });
    $(document).ready(function() {
        // Fires SECOND
    });
    $(document).ready(function() {
        // Fires THIRD
    });
</script>
<body>
... other code, scripts, etc....
</body>
</html>

<script>
    $(document).ready(function() {
        // Fires FOURTH
        // This event will fire after all the other $(document).ready() functions have completed.
        // Usefull when your script is at the top of the page, but you need it run last
        $(document).trigger("my-event-afterLastDocumentReady");
    });
</script>

Using array map to filter results with if conditional

You could use flatMap. It can filter and map in one.

$scope.appIds = $scope.applicationsHere.flatMap(obj => obj.selected ? obj.id : [])

Rails 3 check if attribute changed

Above answers are better but yet for knowledge we have another approch as well, Lets 'catagory' column value changed for an object (@design),

@design.changes.has_key?('catagory')

The .changes will return a hash with key as column's name and values as a array with two values [old_value, new_value] for each columns. For example catagory for above is changed from 'ABC' to 'XYZ' of @design,

@design.changes   # => {} 
@design.catagory = 'XYZ'
@design.changes # => { 'catagory' => ['ABC', 'XYZ'] }

For references change in ROR

VideoView Full screen in android application

Try code below here.

if (!isFullScreen())
        {
            Log.v("Full screen", "-----------is full screen------------");  
            setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE); 
            DisplayMetrics displaymetrics = new DisplayMetrics();
              getWindowManager().getDefaultDisplay().getMetrics(displaymetrics);
              int height = displaymetrics.heightPixels;
              int width = displaymetrics.widthPixels;
              android.widget.FrameLayout.LayoutParams params = (android.widget.FrameLayout.LayoutParams) videoSurface.getLayoutParams();
              params.width = width;
              params.height=height;
              params.setMargins(0, 0, 0, 0);

        }
        else{
            Log.v("Full screen", "-----------small screen------------");    

            DisplayMetrics displaymetrics = new DisplayMetrics();
              getWindowManager().getDefaultDisplay().getMetrics(displaymetrics);
              int height = displaymetrics.heightPixels;
              int width = displaymetrics.widthPixels;
              android.widget.FrameLayout.LayoutParams params = (android.widget.FrameLayout.LayoutParams) videoSurface.getLayoutParams();
              params.width = width;
              params.height=height / 3;
              params.setMargins(0, 0, 0, 0);
        }

How to use wait and notify in Java without IllegalMonitorStateException?

To be able to call notify() you need to synchronize on the same object.

synchronized (someObject) {
    someObject.wait();
}

/* different thread / object */
synchronized (someObject) {
    someObject.notify();
}

How do you use https / SSL on localhost?

This question is really old, but I came across this page when I was looking for the easiest and quickest way to do this. Using Webpack is much simpler:

install webpack-dev-server

npm i -g webpack-dev-server

start webpack-dev-server with https

webpack-dev-server --https

Anaconda export Environment file

The easiest way to save the packages from an environment to be installed in another computer is:

$ conda list -e > req.txt

then you can install the environment using

$ conda create -n <environment-name> --file req.txt

if you use pip, please use the following commands: reference https://pip.pypa.io/en/stable/reference/pip_freeze/

$ env1/bin/pip freeze > requirements.txt
$ env2/bin/pip install -r requirements.txt

Set cookies for cross origin requests

In order for the client to be able to read cookies from cross-origin requests, you need to have:

  1. All responses from the server need to have the following in their header:

    Access-Control-Allow-Credentials: true

  2. The client needs to send all requests with withCredentials: true option

In my implementation with Angular 7 and Spring Boot, I achieved that with the following:


Server-side:

@CrossOrigin(origins = "http://my-cross-origin-url.com", allowCredentials = "true")
@Controller
@RequestMapping(path = "/something")
public class SomethingController {
  ...
}

The origins = "http://my-cross-origin-url.com" part will add Access-Control-Allow-Origin: http://my-cross-origin-url.com to every server's response header

The allowCredentials = "true" part will add Access-Control-Allow-Credentials: true to every server's response header, which is what we need in order for the client to read the cookies


Client-side:

import { HttpInterceptor, HttpXsrfTokenExtractor, HttpRequest, HttpHandler, HttpEvent } from "@angular/common/http";
import { Injectable } from "@angular/core";
import { Observable } from 'rxjs';

@Injectable()
export class CustomHttpInterceptor implements HttpInterceptor {

    constructor(private tokenExtractor: HttpXsrfTokenExtractor) {
    }

    intercept(req: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
        // send request with credential options in order to be able to read cross-origin cookies
        req = req.clone({ withCredentials: true });

        // return XSRF-TOKEN in each request's header (anti-CSRF security)
        const headerName = 'X-XSRF-TOKEN';
        let token = this.tokenExtractor.getToken() as string;
        if (token !== null && !req.headers.has(headerName)) {
            req = req.clone({ headers: req.headers.set(headerName, token) });
        }
        return next.handle(req);
    }
}

With this class you actually inject additional stuff to all your request.

The first part req = req.clone({ withCredentials: true });, is what you need in order to send each request with withCredentials: true option. This practically means that an OPTION request will be send first, so that you get your cookies and the authorization token among them, before sending the actual POST/PUT/DELETE requests, which need this token attached to them (in the header), in order for the server to verify and execute the request.

The second part is the one that specifically handles an anti-CSRF token for all requests. Reads it from the cookie when needed and writes it in the header of every request.

The desired result is something like this:

response request

Why split the <script> tag when writing it with document.write()?

The </script> inside the Javascript string litteral is interpreted by the HTML parser as a closing tag, causing unexpected behaviour (see example on JSFiddle).

To avoid this, you can place your javascript between comments (this style of coding was common practice, back when Javascript was poorly supported among browsers). This would work (see example in JSFiddle):

<script type="text/javascript">
    <!--
    if (jQuery === undefined) {
        document.write('<script type="text/javascript" src="http://z-ecx.images-amazon.com/images/G/01/javascripts/lib/jquery/jquery-1.2.6.pack._V265113567_.js"></script>');
    }
    // -->
</script>

...but to be honest, using document.write is not something I would consider best practice. Why not manipulating the DOM directly?

<script type="text/javascript">
    <!--
    if (jQuery === undefined) {
        var script = document.createElement('script');
        script.setAttribute('type', 'text/javascript');
        script.setAttribute('src', 'http://z-ecx.images-amazon.com/images/G/01/javascripts/lib/jquery/jquery-1.2.6.pack._V265113567_.js');
        document.body.appendChild(script);
    }
    // -->
</script>

scp with port number specified

Unlike ssh, scp uses the uppercase P switch to set the port instead of the lowercase p:

scp -P 80 ... # Use port 80 to bypass the firewall, instead of the scp default

The lowercase p switch is used with scp for the preservation of times and modes.

Here is an excerpt from scp's man page with all of the details concerning the two switches, as well as an explanation of why uppercase P was chosen for scp:

-P port   Specifies the port to connect to on the remote host. Note that this option is written with a capital 'P', because -p is already reserved for preserving the times and modes of the file in rcp(1).

-p           Preserves modification times, access times, and modes from the original file.

Update and aside to address one of the (heavily upvoted) comments:

With regard to Abdull's comment about scp option order, what he suggests:

scp -P80 -r some_directory -P 80 ...

..., intersperses options and parameters. getopt(1) clearly defines that parameters must come after options and not be interspersed with them:

The parameters getopt is called with can be divided into two parts: options which modify the way getopt will do the parsing (the options and the optstring in the SYNOPSIS), and the parameters which are to be parsed (parameters in the SYNOPSIS). The second part will start at the first non-option parameter that is not an option argument, or after the first occurrence of '--'. If no '-o' or '--options' option is found in the first part, the first parameter of the second part is used as the short options string.

Since the -r command line option takes no further arguments, some_directory is "the first non-option parameter that is not an option argument." Therefore, as clearly spelled out in the getopt(1) man page, all succeeding command line arguments that follow it (i.e., -P 80 ...) are assumed to be non-options (and non-option arguments).

So, in effect, this is how getopt(1) sees the example presented with the end of the options and the beginning of the parameters demarcated by succeeding text bing in gray:

scp -P80 -r some_directory -P 80 ...

This has nothing to do with scp behavior and everything to do with how POSIX standard applications parse command line options using the getopt(3) set of C functions.

For more details with regard to command line ordering and processing, please read the getopt(1) manpage using:

man 1 getopt

How can I convert a string to a number in Perl?

$var += 0

probably what you want. Be warned however, if $var is string could not be converted to numeric, you'll get the error, and $var will be reset to 0:

my $var = 'abc123';
print "var = $var\n";
$var += 0;
print "var = $var\n";

logs

var = abc123
Argument "abc123" isn't numeric in addition (+) at test.pl line 7.
var = 0

Cannot checkout, file is unmerged

Following is worked for me

git reset HEAD

I was getting following error

git stash
src/config.php: needs merge
src/config.php: needs merge
src/config.php: unmerge(230a02b5bf1c6eab8adce2cec8d573822d21241d)
src/config.php: unmerged (f5cc88c0fda69bf72107bcc5c2860c3e5eb978fa)

Then i ran

git reset HEAD

it worked

How to sort with lambda in Python

Use

a = sorted(a, key=lambda x: x.modified, reverse=True)
#             ^^^^

On Python 2.x, the sorted function takes its arguments in this order:

sorted(iterable, cmp=None, key=None, reverse=False)

so without the key=, the function you pass in will be considered a cmp function which takes 2 arguments.

How can I initialise a static Map?

With Eclipse Collections, all of the following will work:

import java.util.Map;

import org.eclipse.collections.api.map.ImmutableMap;
import org.eclipse.collections.api.map.MutableMap;
import org.eclipse.collections.impl.factory.Maps;

public class StaticMapsTest
{
    private static final Map<Integer, String> MAP =
        Maps.mutable.with(1, "one", 2, "two");

    private static final MutableMap<Integer, String> MUTABLE_MAP =
       Maps.mutable.with(1, "one", 2, "two");


    private static final MutableMap<Integer, String> UNMODIFIABLE_MAP =
        Maps.mutable.with(1, "one", 2, "two").asUnmodifiable();


    private static final MutableMap<Integer, String> SYNCHRONIZED_MAP =
        Maps.mutable.with(1, "one", 2, "two").asSynchronized();


    private static final ImmutableMap<Integer, String> IMMUTABLE_MAP =
        Maps.mutable.with(1, "one", 2, "two").toImmutable();


    private static final ImmutableMap<Integer, String> IMMUTABLE_MAP2 =
        Maps.immutable.with(1, "one", 2, "two");
}

You can also statically initialize primitive maps with Eclipse Collections.

import org.eclipse.collections.api.map.primitive.ImmutableIntObjectMap;
import org.eclipse.collections.api.map.primitive.MutableIntObjectMap;
import org.eclipse.collections.impl.factory.primitive.IntObjectMaps;

public class StaticPrimitiveMapsTest
{
    private static final MutableIntObjectMap<String> MUTABLE_INT_OBJ_MAP =
            IntObjectMaps.mutable.<String>empty()
                    .withKeyValue(1, "one")
                    .withKeyValue(2, "two");

    private static final MutableIntObjectMap<String> UNMODIFIABLE_INT_OBJ_MAP =
            IntObjectMaps.mutable.<String>empty()
                    .withKeyValue(1, "one")
                    .withKeyValue(2, "two")
                    .asUnmodifiable();

    private static final MutableIntObjectMap<String> SYNCHRONIZED_INT_OBJ_MAP =
            IntObjectMaps.mutable.<String>empty()
                    .withKeyValue(1, "one")
                    .withKeyValue(2, "two")
                    .asSynchronized();

    private static final ImmutableIntObjectMap<String> IMMUTABLE_INT_OBJ_MAP =
            IntObjectMaps.mutable.<String>empty()
                    .withKeyValue(1, "one")
                    .withKeyValue(2, "two")
                    .toImmutable();

    private static final ImmutableIntObjectMap<String> IMMUTABLE_INT_OBJ_MAP2 =
            IntObjectMaps.immutable.<String>empty()
                    .newWithKeyValue(1, "one")
                    .newWithKeyValue(2, "two");
} 

Note: I am a committer for Eclipse Collections

How do you make Vim unhighlight what you searched for?

            *:noh* *:nohlsearch*
:noh[lsearch]       Stop the highlighting for the 'hlsearch' option.  It
            is automatically turned back on when using a search
            command, or setting the 'hlsearch' option.
            This command doesn't work in an autocommand, because
            the highlighting state is saved and restored when
            executing autocommands |autocmd-searchpat|.
            Same thing for when invoking a user function.

I found it just under :help #, which I keep hitting all the time, and which highlights all the words on the current page like the current one.

jQuery Date Picker - disable past dates

You must create a new date object and set it as minDate when you initialize the datepickers

<label for="from">From</label> <input type="text" id="from" name="from"/> <label for="to">to</label> <input type="text" id="to" name="to"/>

var dateToday = new Date();
var dates = $("#from, #to").datepicker({
    defaultDate: "+1w",
    changeMonth: true,
    numberOfMonths: 3,
    minDate: dateToday,
    onSelect: function(selectedDate) {
        var option = this.id == "from" ? "minDate" : "maxDate",
            instance = $(this).data("datepicker"),
            date = $.datepicker.parseDate(instance.settings.dateFormat || $.datepicker._defaults.dateFormat, selectedDate, instance.settings);
        dates.not(this).datepicker("option", option, date);
    }
});

Edit - from your comment now it works as expected http://jsfiddle.net/nicolapeluchetti/dAyzq/1/

Copying files from server to local computer using SSH

Your question is a bit confusing, but I am assuming - you are first doing 'ssh' to find out which files or rather specifically directories are there and then again on your local computer, you are trying to scp 'all' files in that directory to local path. you should simply do scp -r.

So here in your case it'd be something like

local> scp -r [email protected]:/path/to/dir local/path 

If youare using some other executable that provides 'scp like functionality', refer to it's manual for recursively copying files.

Finding first blank row, then writing to it

very old thread but .. i was lookin for an "easier"... a smaller code

i honestly dont understand any of the answers above :D - i´m a noob

but this should do the job. (for smaller sheets)

Set objExcel = CreateObject("Excel.Application")
objExcel.Workbooks.Add

reads every cell in col 1 from bottom up and stops at first empty cell

intRow = 1
Do until objExcel.Cells(intRow, 1).Value = ""
   intRow = intRow + 1
Loop

then you can write your info like this

objExcel.Cells(intRow, 1).Value = "first emtpy row, col 1"
objExcel.Cells(intRow, 2).Value = "first emtpy row, col 2"

etc...

and then i recognize its an vba thread ... lol

How can I show three columns per row?

Try this one using Grid Layout:

_x000D_
_x000D_
.grid-container {_x000D_
  display: grid;_x000D_
  grid-template-columns: auto auto auto;_x000D_
  padding: 10px;_x000D_
}_x000D_
.grid-item {_x000D_
  background-color: rgba(255, 255, 255, 0.8);_x000D_
  border: 1px solid rgba(0, 0, 0, 0.8);_x000D_
  padding: 20px;_x000D_
  font-size: 30px;_x000D_
  text-align: center;_x000D_
}
_x000D_
<div class="grid-container">_x000D_
  <div class="grid-item">1</div>_x000D_
  <div class="grid-item">2</div>_x000D_
  <div class="grid-item">3</div>  _x000D_
  <div class="grid-item">4</div>_x000D_
  <div class="grid-item">5</div>_x000D_
  <div class="grid-item">6</div>  _x000D_
  <div class="grid-item">7</div>_x000D_
  <div class="grid-item">8</div>_x000D_
  <div class="grid-item">9</div>  _x000D_
</div>
_x000D_
_x000D_
_x000D_

How to set default value to all keys of a dict object in python?

You can replace your old dictionary with a defaultdict:

>>> from collections import defaultdict
>>> d = {'foo': 123, 'bar': 456}
>>> d['baz']
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
KeyError: 'baz'
>>> d = defaultdict(lambda: -1, d)
>>> d['baz']
-1

The "trick" here is that a defaultdict can be initialized with another dict. This means that you preserve the existing values in your normal dict:

>>> d['foo']
123

WCF Error "This could be due to the fact that the server certificate is not configured properly with HTTP.SYS in the HTTPS case"

If your WCF service is using .net framework 4.0 and someone has disabled TLS 1.0 on the server then you will see this exception. Due to .net 4.0 not supporting the higher versions of TLS.

Supported protocols: https://msdn.microsoft.com/en-us/library/system.security.authentication.sslprotocols(v=vs.100).aspx

How can we dynamically allocate and grow an array

you can not increase array size dynamically better you copy into new array. Use System.arrayCopy for that, it better than copying each element into new array. For reference Why is System.arraycopy native in Java?.

private static Object resizeArray (Object oldArray, int newSize) {
   int oldSize = java.lang.reflect.Array.getLength(oldArray);
   Class elementType = oldArray.getClass().getComponentType();
   Object newArray = java.lang.reflect.Array.newInstance(
         elementType, newSize);
   int preserveLength = Math.min(oldSize, newSize);
   if (preserveLength > 0)
      System.arraycopy(oldArray, 0, newArray, 0, preserveLength);
   return newArray;
}

file path Windows format to java format

String path = "C:\\Documents and Settings\\Manoj\\Desktop";
String javaPath = path.replace("\\", "/"); // Create a new variable

or

path = path.replace("\\", "/"); // Just use the existing variable

Strings are immutable. Once they are created, you can't change them. This means replace returns a new String where the target("\\") is replaced by the replacement("/"). Simply calling replace will not change path.

The difference between replaceAll and replace is that replaceAll will search for a regex, replace doesn't.

How to copy Java Collections list

Just do:

List a = new ArrayList(); 
a.add("a"); 
a.add("b"); 
a.add("c"); 
List b = new ArrayList(a);

ArrayList has a constructor that will accept another Collection to copy the elements from

How to change Android usb connect mode to charge only?

I have been searching for this for ages on my CM 11 android phone, running kitkat.

Well.. finally I found it. It's hidden in a totally unintuitive location:

  1. Go to settings
  2. Go to storage
  3. Open the menu and choose USB computer connection

Here you can choose between Media Device (MTP), Camera (PTP) and Mass storage (UMS). Turn them all off to get it to charge only.

Sadly, if the option is not there, it is not supported by the phone. This seems to be the case for my HTC One (M7).

Difference between Ctrl+Shift+F and Ctrl+I in Eclipse

Ctrl+Shift+F formats the selected line(s) or the whole source code if you haven't selected any line(s) as per the formatter specified in your Eclipse, while Ctrl+I gives proper indent to the selected line(s) or the current line if you haven't selected any line(s).

How to get the request parameters in Symfony 2?

Your options:

  1. Simple:
    • $request->request->get('param') ($_POST['param']) or
    • $request->query->get('param') ($_GET['param'])
  2. Good Symfony forms with all validation, value transormation and form rendering with errors and many other features:
  3. Something in between (see example below)
<?php
/**
 * @Route("/customers", name="customers")
 *
 * @param Request $request
 * @return Response
 */
public function index(Request $request)
{
    $optionsResolver = new OptionsResolver();
    $optionsResolver->setDefaults([
        'email' => '',
        'phone' => '',
    ]);
    $filter = $optionsResolver->resolve($request->query->all());

    /** @var CustomerRepository $customerRepository */
    $customerRepository = $this->getDoctrine()->getRepository('AppBundle:Customer');

    /** @var Customer[] $customers */
    $customers = $customerRepository->findFilteredCustomers($filter);

    return $this->render(':customers:index.html.twig', [
        'customers' => $customers,
        'filter' => $filter,
    ]);
}

More about OptionsResolver - http://symfony.com/doc/current/components/options_resolver.html

How do you create a REST client for Java?

I wrote a library that maps a java interface to a remote JSON REST service:

https://github.com/ggeorgovassilis/spring-rest-invoker

public interface BookService {
   @RequestMapping("/volumes")
   QueryResult findBooksByTitle(@RequestParam("q") String q);

   @RequestMapping("/volumes/{id}")
   Item findBookById(@PathVariable("id") String id);
}

Batch Extract path and filename from a variable

All of this works for me:

@Echo Off
Echo Directory = %~dp0
Echo Object Name With Quotations=%0
Echo Object Name Without Quotes=%~0
Echo Bat File Drive = %~d0
Echo Full File Name = %~n0%~x0
Echo File Name Without Extension = %~n0
Echo File Extension = %~x0
Pause>Nul

Output:

Directory = D:\Users\Thejordster135\Desktop\Code\BAT\

Object Name With Quotations="D:\Users\Thejordster135\Desktop\Code\BAT\Path_V2.bat"

Object Name Without Quotes=D:\Users\Thejordster135\Desktop\Code\BAT\Path_V2.bat

Bat File Drive = D:

Full File Name = Path.bat

File Name Without Extension = Path

File Extension = .bat

Stock ticker symbol lookup API

You can use yahoo's symbol lookup like so:

http://d.yimg.com/autoc.finance.yahoo.com/autoc?query=yahoo&callback=YAHOO.Finance.SymbolSuggest.ssCallback

Where query is the company name.

You'll get something like this in return:

YAHOO.Finance.SymbolSuggest.ssCallback(
{
    "ResultSet": {
        "Query": "ya",
        "Result": [
            {
                "symbol": "YHOO",
                "name": "Yahoo! Inc.",
                "exch": "NMS",
                "type": "S",
                "exchDisp": "NASDAQ"
            },
            {
                "symbol": "AUY",
                "name": "Yamana Gold, Inc.",
                "exch": "NYQ",
                "type": "S",
                "exchDisp": "NYSE"
            },
            {
                "symbol": "YZC",
                "name": "Yanzhou Coal Mining Co. Ltd.",
                "exch": "NYQ",
                "type": "S",
                "exchDisp": "NYSE"
            },
            {
                "symbol": "YRI.TO",
                "name": "YAMANA GOLD INC COM NPV",
                "exch": "TOR",
                "type": "S",
                "exchDisp": "Toronto"
            },
            {
                "symbol": "8046.TW",
                "name": "NAN YA PRINTED CIR TWD10",
                "exch": "TAI",
                "type": "S",
                "exchDisp": "Taiwan"
            },
            {
                "symbol": "600319.SS",
                "name": "WEIFANG YAXING CHE 'A'CNY1",
                "exch": "SHH",
                "type": "S",
                "exchDisp": "Shanghai"
            },
            {
                "symbol": "1991.HK",
                "name": "TA YANG GROUP",
                "exch": "HKG",
                "type": "S",
                "exchDisp": "Hong Kong"
            },
            {
                "symbol": "1303.TW",
                "name": "NAN YA PLASTIC TWD10",
                "exch": "TAI",
                "type": "S",
                "exchDisp": "Taiwan"
            },
            {
                "symbol": "0294.HK",
                "name": "YANGTZEKIANG",
                "exch": "HKG",
                "type": "S",
                "exchDisp": "Hong Kong"
            },
            {
                "symbol": "YAVY",
                "name": "Yadkin Valley Financial Corp.",
                "exch": "NMS",
                "type": "S",
                "exchDisp": "NASDAQ"
            }
        ]
    }
}
)

Which is JSON and very easy to work with.

Hush... don't tell anybody.

How to add a filter class in Spring Boot?

There are three ways to add your filter,

  1. Annotate your filter with one of the Spring stereotypes such as @Component
  2. Register a @Bean with Filter type in Spring @Configuration
  3. Register a @Bean with FilterRegistrationBean type in Spring @Configuration

Either #1 or #2 will do if you want your filter applies to all requests without customization, use #3 otherwise. You don't need to specify component scan for #1 to work as long as you place your filter class in the same or sub-package of your SpringApplication class. For #3, use along with #2 is only necessary when you want Spring to manage your filter class such as have it auto wired dependencies. It works just fine for me to new my filter which doesn't need any dependency autowiring/injection.

Although combining #2 and #3 works fine, I was surprised it doesn't end up with two filters applying twice. My guess is that Spring combines the two beans as one when it calls the same method to create both of them. In case you want to use #3 alone with authowiring, you can AutowireCapableBeanFactory. The following is an example,

private @Autowired AutowireCapableBeanFactory beanFactory;

    @Bean
    public FilterRegistrationBean myFilter() {
        FilterRegistrationBean registration = new FilterRegistrationBean();
        Filter myFilter = new MyFilter();
        beanFactory.autowireBean(myFilter);
        registration.setFilter(myFilter);
        registration.addUrlPatterns("/myfilterpath/*");
        return registration;
    }

Two dimensional array list

Here's how to make and print a 2D Multi-Dimensional Array using the ArrayList Object.

import java.util.ArrayList;

public class TwoD_ArrayListExample {
    static public ArrayList<ArrayList<String>> gameBoard = new ArrayList<ArrayList<String>>();

    public static void main(String[] args) {
        insertObjects();
        printTable(gameBoard);
    }

    public static void insertObjects() {
        for (int rowNum = 0; rowNum != 8; rowNum++) {
            ArrayList<String> oneRow = new ArrayList<String>();
            gameBoard.add(rowNum, oneRow);

            for (int columnNum = 0; columnNum != 8; columnNum++) {
                String description= "Description of Objects: row= "+ rowNum + ", column= "+ columnNum;
                    oneRow.add(columnNum, description);
            }
        }
    }

    // The printTable method prints the table to the console
    private static void printTable(ArrayList<ArrayList<String>> table) {
        for (int row = 0; row != 8; row++) {
            for (int col = 0; col != 8; col++) {
                System.out.println("Printing:               row= "+ row+ ", column= "+ col);
                System.out.println(table.get(row).get(col).toString());
            }
        }
        System.out.println("\n");
    }
}

pip install from git repo branch

Instructions to install from private repo using ssh credentials:

$ pip install git+ssh://[email protected]/myuser/foo.git@my_version

Bootstrap's JavaScript requires jQuery version 1.9.1 or higher

I found the best way to fix this error: Bootstrap’s JavaScript requires jQuery version 1.9.1 or higher

In Wordpress..just ran this plugin and it fixed it. Thought I'd share jQuery Updater

Web scraping with Python

Here is a simple web crawler, i used BeautifulSoup and we will search for all the links(anchors) who's class name is _3NFO0d. I used Flipkar.com, it is an online retailing store.

import requests
from bs4 import BeautifulSoup
def crawl_flipkart():
    url = 'https://www.flipkart.com/'
    source_code = requests.get(url)
    plain_text = source_code.text
    soup = BeautifulSoup(plain_text, "lxml")
    for link in soup.findAll('a', {'class': '_3NFO0d'}):
        href = link.get('href')
        print(href)

crawl_flipkart()

Query to get all rows from previous month

WHERE created_date >= DATE_ADD(LAST_DAY(DATE_SUB(NOW(), INTERVAL 2 MONTH)), INTERVAL 1 DAY) 
  AND created_date <= DATE_ADD(LAST_DAY(DATE_SUB(NOW(), INTERVAL 1 MONTH)), INTERVAL 0 DAY) 

This worked for me (Selects all records created from last month, regardless of the day you run the query this month)

JAVA How to remove trailing zeros from a double

Use a DecimalFormat object with a format string of "0.#".

OpenVPN failed connection / All TAP-Win32 adapters on this system are currently in use

I found a solution to this. It's bloody witchcraft, but it works.

When you install the client, open Control Panel > Network Connections.

You'll see a disabled network connection that was added by the TAP installer (Local Area Connection 3 or some such).

Right Click it, click Enable.

The device will not reset itself to enabled, but that's ok; try connecting w/ the client again. It'll work.

How to quit android application programmatically

getActivity().finish();
System.exit(0);

this is the best way to exit your app.!!!

The best solution for me.

Removing character in list of strings

A faster way is to join the list, replace 8 and split the new string:

mylist = [("aaaa8"),("bb8"),("ccc8"),("dddddd8")]
mylist = ' '.join(mylist).replace('8','').split()
print mylist

Replace Div Content onclick

EDIT: This answer was submitted before the OP's jsFiddle example was posted in question. See second answer for response to that jsFiddle.


Here is an example of how it could work:

Working jsFiddle Demo

HTML:

<div id="someDiv">
    Once upon a midnight dreary
    <br>While I pondered weak and weary
    <br>Over many a quaint and curious
    <br>Volume of forgotten lore.
</div>
Type new text here:<br>
<input type="text" id="replacementtext" />
<input type="button" id="mybutt" value="Swap" />

<input type="hidden" id="vault" />

javascript/jQuery:

//Declare persistent vars outside function
var savText, newText, myState = 0;

$('#mybutt').click(function(){
    if (myState==0){
        savText = $('#someDiv').html(); //save poem data from DIV
        newText = $('#replacementtext').val(); //save data from input field
        $('#replacementtext').val(''); //clear input field
        $('#someDiv').html( newText ); //replace poem with insert field data
        myState = 1; //remember swap has been done once
    } else {
        $('#someDiv').html(savText);
        $('#replacementtext').val(newText); //replace contents
        myState = 0;
    }
});

Can't load AMD 64-bit .dll on a IA 32-bit platform

Try this:

  1. Download and install a 32-bit JDK.
  2. Go to eclipse click on your project (Run As ? Run Configurations...) under Java Application branch.
  3. Go to the JRE tab and select Alternate JRE. Click on Installed JRE button, add your 32-bit JRE and select.

Store an array in HashMap

Your life will be much easier if you can save a List as the value instead of an array in that Map.

jQuery remove options from select

It works on either option tag or text field:

$("#idname option[value='option1']").remove();

Removing padding gutter from grid columns in Bootstrap 4

You should use built-in bootstrap4 spacing classes for customizing the spacing of elements, that's more convenient method .

Delete the last two characters of the String

You may use the following method to remove last n character -

public String removeLast(String s, int n) {
    if (null != s && !s.isEmpty()) {
        s = s.substring(0, s.length()-n);
    }
    return s;
}

How do I get values from a SQL database into textboxes using C#?

If you want to display single value access from database into textbox, please refer to the code below:

SqlConnection con=new SqlConnection("connection string");
SqlCommand cmd=new SqlConnection(SqlQuery,Con);
Con.Open();
TextBox1.Text=cmd.ExecuteScalar();
Con.Close();

or

SqlConnection con=new SqlConnection("connection string");
SqlCommand cmd=new SqlConnection(SqlQuery,Con);
Con.Open();
SqlDataReader dr=new SqlDataReadr();
dr=cmd.Executereader();
if(dr.read())
{
    TextBox1.Text=dr.GetValue(0).Tostring();
}
Con.Close();

Switch case: can I use a range instead of a one number

In C# switch cases are basically dictionaries on what to do next. Since you can't look up a range in a dictionary, the best you can do is the case ... when statement Steve Gomez mentioned.

How to convert byte array to string and vice versa?

Even though

new String(bytes, "UTF-8")

is correct it throws a UnsupportedEncodingException which forces you to deal with a checked exception. You can use as an alternative another constructor since Java 1.6 to convert a byte array into a String:

new String(bytes, StandardCharsets.UTF_8)

This one does not throw any exception.

Converting back should be also done with StandardCharsets.UTF_8:

"test".getBytes(StandardCharsets.UTF_8)

Again you avoid having to deal with checked exceptions.

javascript: get a function's variable's value within another function

you need a return statement in your first function.

function first(){
    var nameContent = document.getElementById('full_name').value;
    return nameContent;
}

and then in your second function can be:

function second(){
    alert(first());
}

Technically what is the main difference between Oracle JDK and OpenJDK?

Technical differences are a consequence of the goal of each one (OpenJDK is meant to be the reference implementation, open to the community, while Oracle is meant to be a commercial one)

They both have "almost" the same code of the classes in the Java API; but the code for the virtual machine itself is actually different, and when it comes to libraries, OpenJDK tends to use open libraries while Oracle tends to use closed ones; for instance, the font library.

TypeScript error: Type 'void' is not assignable to type 'boolean'

It means that the callback function you passed to this.dataStore.data.find should return a boolean and have 3 parameters, two of which can be optional:

  • value: Conversations
  • index: number
  • obj: Conversation[]

However, your callback function does not return anything (returns void). You should pass a callback function with the correct return value:

this.dataStore.data.find((element, index, obj) => {
    // ...

    return true; // or false
});

or:

this.dataStore.data.find(element => {
    // ...

    return true; // or false
});

Reason why it's this way: the function you pass to the find method is called a predicate. The predicate here defines a boolean outcome based on conditions defined in the function itself, so that the find method can determine which value to find.

In practice, this means that the predicate is called for each item in data, and the first item in data for which your predicate returns true is the value returned by find.

How to verify CuDNN installation?

I have cuDNN 8.0 and none of the suggestions above worked for me. The desired information was in /usr/include/cudnn_version.h, so

cat /usr/include/cudnn_version.h | grep CUDNN_MAJOR -A 2

did the trick.

How to write a multiline Jinja statement

According to the documentation: https://jinja.palletsprojects.com/en/2.10.x/templates/#line-statements you may use multi-line statements as long as the code has parens/brackets around it. Example:

{% if ( (foo == 'foo' or bar == 'bar') and 
        (fooo == 'fooo' or baar == 'baar') ) %}
    <li>some text</li>
{% endif %}

Edit: Using line_statement_prefix = '#'* the code would look like this:

# if ( (foo == 'foo' or bar == 'bar') and 
       (fooo == 'fooo' or baar == 'baar') )
    <li>some text</li>
# endif

*Here's an example of how you'd specify the line_statement_prefix in the Environment:

from jinja2 import Environment, PackageLoader, select_autoescape
env = Environment(
    loader=PackageLoader('yourapplication', 'templates'),
    autoescape=select_autoescape(['html', 'xml']),
    line_statement_prefix='#'
)

Or using Flask:

from flask import Flask
app = Flask(__name__, instance_relative_config=True, static_folder='static')
app.jinja_env.filters['zip'] = zip
app.jinja_env.line_statement_prefix = '#'

Apache2: 'AH01630: client denied by server configuration'

This drove me absolutely nuts for a day and a half but I found a solution if all other solutions have been tried unsuccessfully.

This is for macOS.

  • Go to activity Monitor (spotlight search for: activity)
  • In activity monitor search for httpd which is the Apache service
  • Select the one that belongs to root and click X on the top left to close it.

At that point I immediately stopped getting 403 errors and everything started working as expected. Weird thing is i didn't even have to restart apache it just worked, i guess it restarted itself when i went to my localhost, I honestly don't know but I guess the problem is Apache not actually restarting when using apachectl restart, or stop or start. Hope this helps someone.

How to get an object's methods?

for me, the only reliable way to get the methods of the final extending class, was to do like this:

function getMethodsOf(obj){
  const methods = {}
  Object.getOwnPropertyNames( Object.getPrototypeOf(obj) ).forEach(methodName => {
    methods[methodName] = obj[methodName]
  })
  return methods
}

Deleting Elements in an Array if Element is a Certain value VBA

I'm pretty new to vba & excel - only been doing this for about 3 months - I thought I'd share my array de-duplication method here as this post seems relevant to it:

This code if part of a bigger application that analyses pipe data- Pipes are listed in a sheet with number in xxxx.1, xxxx.2, yyyy.1, yyyy.2 .... format. so thats why all the string manipulation exists. basically it only collects the pipe number once only, and not the .2 or .1 part.

        With wbPreviousSummary.Sheets(1)
'   here, we will write the edited pipe numbers to a collection - then pass the collection to an array
        Dim PipeDict As New Dictionary

        Dim TempArray As Variant

        TempArray = .Range(.Cells(3, 2), .Cells(3, 2).End(xlDown)).Value

        For ele = LBound(TempArray, 1) To UBound(TempArray, 1)

            If Not PipeDict.Exists(Left(TempArray(ele, 1), Len(TempArray(ele, 1) - 2))) Then

                PipeDict.Add Key:=Left(TempArray(ele, 1), Len(TempArray(ele, 1) - 2)), _
                                                        Item:=Left(TempArray(ele, 1), Len(TempArray(ele, 1) - 2))

            End If

        Next ele

        TempArray = PipeDict.Items

        For ele = LBound(TempArray) To UBound(TempArray)
            MsgBox TempArray(ele)
        Next ele

    End With
    wbPreviousSummary.Close SaveChanges:=False

    Set wbPreviousSummary = Nothing 'done early so we dont have the information loaded in memory

Using a heap of message boxes for debugging atm - im sure you'll change it to suit your own work.

I hope people find this useful, Regards Joe

Why is Python running my module when I import it, and how do I stop it?

Unfortunately, you don't. That is part of how the import syntax works and it is important that it does so -- remember def is actually something executed, if Python did not execute the import, you'd be, well, stuck without functions.

Since you probably have access to the file, though, you might be able to look and see what causes the error. It might be possible to modify your environment to prevent the error from happening.

matplotlib set yaxis label size

If you are using the 'pylab' for interactive plotting you can set the labelsize at creation time with pylab.ylabel('Example', fontsize=40).

If you use pyplot programmatically you can either set the fontsize on creation with ax.set_ylabel('Example', fontsize=40) or afterwards with ax.yaxis.label.set_size(40).

Cross-platform way of getting temp directory in Python

The simplest way, based on @nosklo's comment and answer:

import tempfile
tmp = tempfile.mkdtemp()

But if you want to manually control the creation of the directories:

import os
from tempfile import gettempdir
tmp = os.path.join(gettempdir(), '.{}'.format(hash(os.times())))
os.makedirs(tmp)

That way you can easily clean up after yourself when you are done (for privacy, resources, security, whatever) with:

from shutil import rmtree
rmtree(tmp, ignore_errors=True)

This is similar to what applications like Google Chrome and Linux systemd do. They just use a shorter hex hash and an app-specific prefix to "advertise" their presence.

How to update all MySQL table rows at the same time?

The default null value for a field is "not null". So you must set it to "null" before you can set that field value for any record to null. Then you can:

UPDATE `myTable` SET `myField` = null

Explanation of the UML arrows

The accepted answer being said, It is missing some explanations. For example, what is the difference between a uni-directional and a bi-directional association? In the provided example, both do exist. ( Both '5's in the arrows)

If looking for a more complete answer and have more time, here is a thorough explanation.

HTTP Request in Kotlin

Maybe the simplest GET

For everybody stuck with NetworkOnMainThreadException for the other solutions: use AsyncTask or, even shorter, (yet still experimental) Coroutines:

launch {

    val jsonStr = URL("url").readText()

}

If you need to test with plain http don't forget to add to your manifest: android:usesCleartextTraffic="true"


For the experimental Coroutines you have to add to build.gradle as of 10/10/2018:

kotlin {
    experimental {
        coroutines 'enable'
    }
}
dependencies {
    implementation "org.jetbrains.kotlinx:kotlinx-coroutines-core:0.24.0"
    implementation "org.jetbrains.kotlinx:kotlinx-coroutines-android:0.24.0"
    ...

Having a UITextField in a UITableViewCell

Try this one. It can handle scrolling as well and you can reuse the cells without the hassle of removing subviews you added before.

- (NSInteger)tableView:(UITableView *)table numberOfRowsInSection:(NSInteger)section{
    return 10;
}   

- (UITableViewCell *)tableView:(UITableView *)table cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    UITableViewCell *cell = [table dequeueReusableCellWithIdentifier:@"Cell"];
    if( cell == nil)
        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"Cell"] autorelease];   

    cell.textLabel.text = [[NSArray arrayWithObjects:@"First",@"Second",@"Third",@"Forth",@"Fifth",@"Sixth",@"Seventh",@"Eighth",@"Nineth",@"Tenth",nil] 
                           objectAtIndex:indexPath.row];

    if (indexPath.row % 2) {
        UITextField *textField = [[UITextField alloc] initWithFrame:CGRectMake(0, 0, 200, 21)];
        textField.placeholder = @"Enter Text";
        textField.text = [inputTexts objectAtIndex:indexPath.row/2];
        textField.tag = indexPath.row/2;
        textField.delegate = self;
        cell.accessoryView = textField;
        [textField release];
    } else
        cell.accessoryView = nil;

    cell.selectionStyle = UITableViewCellSelectionStyleNone;
    return cell;        
}

- (BOOL)textFieldShouldEndEditing:(UITextField *)textField {
    [inputTexts replaceObjectAtIndex:textField.tag withObject:textField.text];
    return YES;
}

- (void)viewDidLoad {
    inputTexts = [[NSMutableArray alloc] initWithObjects:@"",@"",@"",@"",@"",nil];
    [super viewDidLoad];
}