Plot correlation matrix using pandas

Form correlation matrix, in my case zdf is the dataframe which i need perform correlation matrix.

corrMatrix =zdf.corr()
corrMatrix.to_csv('sm_zscaled_correlation_matrix.csv');
html = corrMatrix.style.background_gradient(cmap='RdBu').set_precision(2).render()

# Writing the output to a html file.
with open('test.html', 'w') as f:
   print('<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8"><meta name="viewport" content="width=device-widthinitial-scale=1.0"><title>Document</title></head><style>table{word-break: break-all;}</style><body>' + html+'</body></html>', file=f)

Then we can take screenshot. or convert html to an image file.

Getting datarow values into a string?

Your rows object holds an Item attribute where you can find the values for each of your columns. You can not expect the columns to concatenate themselves when you do a .ToString() on the row. You should access each column from the row separately, use a for or a foreach to walk the array of columns.

Here, take a look at the class:

http://msdn.microsoft.com/en-us/library/system.data.datarow.aspx

Linux command to print directory structure in the form of a tree

Since it was a successful comment, I am adding it as an answer:
with files:

 find . | sed -e "s/[^-][^\/]*\//  |/g" -e "s/|\([^ ]\)/|-\1/"

How to find all serial devices (ttyS, ttyUSB, ..) on Linux without opening them?

I think I found the answer in my kernel source documentation: /usr/src/linux-2.6.37-rc3/Documentation/filesystems/proc.txt

1.7 TTY info in /proc/tty
-------------------------

Information about  the  available  and actually used tty's can be found in the
directory /proc/tty.You'll  find  entries  for drivers and line disciplines in
this directory, as shown in Table 1-11.


Table 1-11: Files in /proc/tty
..............................................................................
 File          Content                                        
 drivers       list of drivers and their usage                
 ldiscs        registered line disciplines                    
 driver/serial usage statistic and status of single tty lines 
..............................................................................

To see  which  tty's  are  currently in use, you can simply look into the file
/proc/tty/drivers:

  > cat /proc/tty/drivers 
  pty_slave            /dev/pts      136   0-255 pty:slave 
  pty_master           /dev/ptm      128   0-255 pty:master 
  pty_slave            /dev/ttyp       3   0-255 pty:slave 
  pty_master           /dev/pty        2   0-255 pty:master 
  serial               /dev/cua        5   64-67 serial:callout 
  serial               /dev/ttyS       4   64-67 serial 
  /dev/tty0            /dev/tty0       4       0 system:vtmaster 
  /dev/ptmx            /dev/ptmx       5       2 system 
  /dev/console         /dev/console    5       1 system:console 
  /dev/tty             /dev/tty        5       0 system:/dev/tty 
  unknown              /dev/tty        4    1-63 console

Here is a link to this file: http://git.kernel.org/?p=linux/kernel/git/next/linux-next.git;a=blob_plain;f=Documentation/filesystems/proc.txt;hb=e8883f8057c0f7c9950fa9f20568f37bfa62f34a

What does "dereferencing" a pointer mean?

I think all the previous answers are wrong, as they state that dereferencing means accessing the actual value. Wikipedia gives the correct definition instead: https://en.wikipedia.org/wiki/Dereference_operator

It operates on a pointer variable, and returns an l-value equivalent to the value at the pointer address. This is called "dereferencing" the pointer.

That said, we can dereference the pointer without ever accessing the value it points to. For example:

char *p = NULL;
*p;

We dereferenced the NULL pointer without accessing its value. Or we could do:

p1 = &(*p);
sz = sizeof(*p);

Again, dereferencing, but never accessing the value. Such code will NOT crash: The crash happens when you actually access the data by an invalid pointer. However, unfortunately, according the the standard, dereferencing an invalid pointer is an undefined behaviour (with a few exceptions), even if you don't try to touch the actual data.

So in short: dereferencing the pointer means applying the dereference operator to it. That operator just returns an l-value for your future use.

How to scale an Image in ImageView to keep the aspect ratio

For anyone of you who wants the image to fit exact the imageview with proper scaling and no cropping use

imageView.setScaleType(ScaleType.FIT_XY);

where imageView is the view representing your ImageView

Python date string to date object

There is another library called arrow really great to make manipulation on python date.

import arrow
import datetime

a = arrow.get('24052010', 'DMYYYY').date()
print(isinstance(a, datetime.date)) # True

How to do a batch insert in MySQL

mysql allows you to insert multiple rows at once INSERT manual

Does IMDB provide an API?

Im pretty confident that the application you found actually gets their information form Themoviedb.org's API(they get most of there stuff from IMDB). They have a free open API that is used alot of the movie organizer/XMBC applications.

File path to resource in our war/WEB-INF folder?

I know this is late, but this is how I normally do it,

ClassLoader classLoader = Thread.currentThread().getContextClassLoader();           
InputStream stream = classLoader.getResourceAsStream("../test/foo.txt");

What is the best way to test for an empty string with jquery-out-of-the-box?

The link you gave seems to be attempting something different to the test you are trying to avoid repeating.

if (a == null || a=='')

tests if the string is an empty string or null. The article you linked to tests if the string consists entirely of whitespace (or is empty).

The test you described can be replaced by:

if (!a)

Because in javascript, an empty string, and null, both evaluate to false in a boolean context.

Selenium WebDriver and DropDown Boxes

I have to struggle to find how to achieve especial those who are new to this tool (like me)

C# code:

IWebElement ddl = ffDriver.FindElement(By.Id("ddlGoTo")); 
OpenQA.Selenium.Support.UI.SelectElement clickthis = new OpenQA.Selenium.Support.UI.SelectElement(ddl);
clickthis.SelectByText("Your Text");

hope this help others!

How to fix broken paste clipboard in VNC on Windows

I use Remote login with vnc-ltsp-config with GNOME Desktop Environment on CentOS 5.9. From experimenting today, I managed to get cut and paste working for the session and the login prompt (because I'm lazy and would rather copy and paste difficult passwords).

I created a file vncconfig.desktop in the /etc/xdg/autostart directory which enabled cut and paste during the session after login. The vncconfig process is run as the logged in user.

[Desktop Entry]
Name=No name
Encoding=UTF-8
Version=1.0
Exec=vncconfig -nowin
X-GNOME-Autostart-enabled=true
Added vncconfig -nowin & to the bottom of the file /etc/gdm/Init/Desktop which enabled cut and paste in the session during login but terminates after login. The vncconfig process is run as root.
Adding vncconfig -nowin & to the bottom of the file /etc/gdm/PostLogin/Desktop also enabled cut and paste during the session after login. The vncconfig process is run as root however.

Oracle 'Partition By' and 'Row_Number' keyword

That selects the row number per country code, account, and currency. So, the rows with country code "US", account "XYZ" and currency "$USD" will each get a row number assigned from 1-n; the same goes for every other combination of those columns in the result set.

This query is kind of funny, because the order by clause does absolutely nothing. All the rows in each partition have the same country code, account, and currency, so there's no point ordering by those columns. The ultimate row numbers assigned in this particular query will therefore be unpredictable.

Hope that helps...

fcntl substitute on Windows

The substitute of fcntl on windows are win32api calls. The usage is completely different. It is not some switch you can just flip.

In other words, porting a fcntl-heavy-user module to windows is not trivial. It requires you to analyze what exactly each fcntl call does and then find the equivalent win32api code, if any.

There's also the possibility that some code using fcntl has no windows equivalent, which would require you to change the module api and maybe the structure/paradigm of the program using the module you're porting.

If you provide more details about the fcntl calls people can find windows equivalents.

How to squash commits in git after they have been pushed?

git rebase -i master

you will get the editor vm open and msgs something like this

Pick 2994283490 commit msg1
f 7994283490 commit msg2
f 4654283490 commit msg3
f 5694283490 commit msg4
#Some message 
#
#some more

Here I have changed pick for all the other commits to "f" (Stands for fixup).

git push -f origin feature/feature-branch-name-xyz

this will fixup all the commits to one commit and will remove all the other commits . I did this and it helped me.

How can I show/hide a specific alert with twitter bootstrap?

You need to use an id selector:

 //show
 $('#passwordsNoMatchRegister').show();
 //hide
 $('#passwordsNoMatchRegister').hide();

# is an id selector and passwordsNoMatchRegister is the id of the div.

jQuery post() with serialize and extra data

In new version of jquery, could done it via following steps:

get param array via serializeArray()
call push() or similar methods to add additional params to the array,
call $.param(arr) to get serialized string, which could be used as jquery ajax's data param.

Example code:

var paramArr = $("#loginForm").serializeArray();
paramArr.push( {name:'size', value:7} );
$.post("rest/account/login", $.param(paramArr), function(result) {
    // ...
}

Generate a UUID on iOS from Swift

For Swift 3, many Foundation types have dropped the 'NS' prefix, so you'd access it by UUID().uuidString.

Double Iteration in List Comprehension

I feel this is easier to understand

[row[i] for row in a for i in range(len(a))]

result: [1, 2, 3, 4]

Fixing the order of facets in ggplot

There are a couple of good solutions here.

Similar to the answer from Harpal, but within the facet, so doesn't require any change to underlying data or pre-plotting manipulation:

# Change this code:
facet_grid(.~size) + 
# To this code:
facet_grid(~factor(size, levels=c('50%','100%','150%','200%')))

This is flexible, and can be implemented for any variable as you change what element is faceted, no underlying change in the data required.

Are HTTP headers case-sensitive?

The RFC for HTTP (as cited above) dictates that the headers are case-insensitive, however you will find that with certain browsers (I'm looking at you, IE) that capitalizing each of the words tends to be best:

Location: http://stackoverflow.com

Content-Type: text/plain

location: http://stackoverflow.com

content-type: text/plain

This isn't "HTTP" standard, but just another one of the browser quirks, we as developers, have to think about.

Delete element in a slice

There are two options:

A: You care about retaining array order:

a = append(a[:i], a[i+1:]...)
// or
a = a[:i+copy(a[i:], a[i+1:])]

B: You don't care about retaining order (this is probably faster):

a[i] = a[len(a)-1] // Replace it with the last one. CAREFUL only works if you have enough elements.
a = a[:len(a)-1]   // Chop off the last one.

See the link to see implications re memory leaks if your array is of pointers.

https://github.com/golang/go/wiki/SliceTricks

WebSocket with SSL

The WebSocket connection starts its life with an HTTP or HTTPS handshake. When the page is accessed through HTTP, you can use WS or WSS (WebSocket secure: WS over TLS) . However, when your page is loaded through HTTPS, you can only use WSS - browsers don't allow to "downgrade" security.

how to get the attribute value of an xml node using java

public static void main(String[] args) throws IOException {
    String filePath = "/Users/myXml/VH181.xml";
    File xmlFile = new File(filePath);
    DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
    DocumentBuilder dBuilder;
    try {
        dBuilder = dbFactory.newDocumentBuilder();
        Document doc = dBuilder.parse(xmlFile);
        doc.getDocumentElement().normalize();
        printElement(doc);
        System.out.println("XML file updated successfully");
    } catch (SAXException | ParserConfigurationException e1) {
        e1.printStackTrace();
    }
}
private static void printElement(Document someNode) {
    NodeList nodeList = someNode.getElementsByTagName("choiceInteraction");
    for(int z=0,size= nodeList.getLength();z<size; z++) {
            String Value = nodeList.item(z).getAttributes().getNamedItem("id").getNodeValue();
            System.out.println("Choice Interaction Id:"+Value);
        }
    }

we Can try this code using method

How to write an async method with out parameter?

I love the Try pattern. It's a tidy pattern.

if (double.TryParse(name, out var result))
{
    // handle success
}
else
{
    // handle error
}

But, it's challenging with async. That doesn't mean we don't have real options. Here are the three core approaches you can consider for async methods in a quasi-version of the Try pattern.

Approach 1 - output a structure

This looks most like a sync Try method only returning a tuple instead of a bool with an out parameter, which we all know is not permitted in C#.

var result = await DoAsync(name);
if (result.Success)
{
    // handle success
}
else
{
    // handle error
}

With a method that returns true of false and never throws an exception.

Remember, throwing an exception in a Try method breaks the whole purpose of the pattern.

async Task<(bool Success, StorageFile File, Exception exception)> DoAsync(string fileName)
{
    try
    {
        var folder = ApplicationData.Current.LocalCacheFolder;
        return (true, await folder.GetFileAsync(fileName), null);
    }
    catch (Exception exception)
    {
        return (false, null, exception);
    }
}

Approach 2 - pass in callback methods

We can use anonymous methods to set external variables. It's clever syntax, though slightly complicated. In small doses, it's fine.

var file = default(StorageFile);
var exception = default(Exception);
if (await DoAsync(name, x => file = x, x => exception = x))
{
    // handle success
}
else
{
    // handle failure
}

The method obeys the basics of the Try pattern but sets out parameters to passed in callback methods. It's done like this.

async Task<bool> DoAsync(string fileName, Action<StorageFile> file, Action<Exception> error)
{
    try
    {
        var folder = ApplicationData.Current.LocalCacheFolder;
        file?.Invoke(await folder.GetFileAsync(fileName));
        return true;
    }
    catch (Exception exception)
    {
        error?.Invoke(exception);
        return false;
    }
}

There's a question in my mind about performance here. But, the C# compiler is so freaking smart, that I think you're safe choosing this option, almost for sure.

Approach 3 - use ContinueWith

What if you just use the TPL as designed? No tuples. The idea here is that we use exceptions to redirect ContinueWith to two different paths.

await DoAsync(name).ContinueWith(task =>
{
    if (task.Exception != null)
    {
        // handle fail
    }
    if (task.Result is StorageFile sf)
    {
        // handle success
    }
});

With a method that throws an exception when there is any kind of failure. That's different than returning a boolean. It's a way to communicate with the TPL.

async Task<StorageFile> DoAsync(string fileName)
{
    var folder = ApplicationData.Current.LocalCacheFolder;
    return await folder.GetFileAsync(fileName);
}

In the code above, if the file is not found, an exception is thrown. This will invoke the failure ContinueWith that will handle Task.Exception in its logic block. Neat, huh?

Listen, there's a reason we love the Try pattern. It's fundamentally so neat and readable and, as a result, maintainable. As you choose your approach, watchdog for readability. Remember the next developer who in 6 months and doesn't have you to answer clarifying questions. Your code can be the only documentation a developer will ever have.

Best of luck.

How to put a new line into a wpf TextBlock control?

You can try putting a new line in the data:

<data>Foo bar baz 
 baz bar</data>

If that does not work you might need to parse the string manually.

If you need direct XAML that's easy by the way:

<TextBlock>
    Lorem <LineBreak/>
    Ipsum
</TextBlock>

Check if string contains \n Java

The second one:

word.contains("\n");

URL encoding in Android

you can use below methods

public static String parseUrl(String surl) throws Exception
{
    URL u = new URL(surl);
    return new URI(u.getProtocol(), u.getAuthority(), u.getPath(), u.getQuery(), u.getRef()).toString();
}

public String parseURL(String url, Map<String, String> params)
{
    Builder builder = Uri.parse(url).buildUpon();
    for (String key : params.keySet())
    {
        builder.appendQueryParameter(key, params.get(key));
    }
    return builder.build().toString();
}

the second one is better than first.

How to make an installer for my C# application?

Add a new install project to your solution.
Add targets from all projects you want to be installed.
Configure pre-requirements and choose "Check for .NET 3.5 and SQL Express" option. Choose the location from where missing components must be installed.
Configure your installer settings - company name, version, copyright, etc.
Build and go!

Expansion of variables inside single quotes in a command in Bash

just use printf

instead of

repo forall -c '....$variable'

use printf to replace the variable token with the expanded variable.

For example:

template='.... %s'

repo forall -c $(printf "${template}" "${variable}")

./xx.py: line 1: import: command not found

If you run a script directly e.g., ./xx.py and your script has no shebang such as #!/usr/bin/env python at the very top then your shell may execute it as a shell script. POSIX says:

If the execl() function fails due to an error equivalent to the [ENOEXEC] error defined in the System Interfaces volume of POSIX.1-2008, the shell shall execute a command equivalent to having a shell invoked with the pathname resulting from the search as its first operand, with any remaining arguments passed to the new shell, except that the value of "$0" in the new shell may be set to the command name. If the executable file is not a text file, the shell may bypass this command execution. In this case, it shall write an error message, and shall return an exit status of 126.

Note: you may get ENOEXEC if your text file has no shebang.

Without the shebang, you shell tries to run your Python script as a shell script that leads to the error: import: command not found.

Also, if you run your script as python xx.py then you do not need the shebang. You don't even need it to be executable (+x). Your script is interpreted by python in this case.

On Windows, shebang is not used unless pylauncher is installed. It is included in Python 3.3+.

What resources are shared between threads?

Threads share the code and data segments and the heap, but they don't share the stack.

Where can I view Tomcat log files in Eclipse?

Another forum provided this answer:

Ahh, figured this out. The following system properties need to be set, so that the "logging.properties" file can be picked up.

Assuming that the tomcat is located under an Eclipse project, add the following under the "Arguments" tab of its launch configuration:

-Dcatalina.base="${project_loc}\<apache-tomcat-5.5.23_loc>" 
-Dcatalina.home="${project_loc}\<apache-tomcat-5.5.23_loc>" 
-Djava.util.logging.config.file="${project_loc}\<apache-tomcat-5.5.23_loc>\conf\logging.properties" 
-Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager

http://www.coderanch.com/t/442412/Tomcat/Tweaking-tomcat-logging-properties-file

What does functools.wraps do?

As of python 3.5+:

@functools.wraps(f)
def g():
    pass

Is an alias for g = functools.update_wrapper(g, f). It does exactly three things:

it copies the __module__, __name__, __qualname__, __doc__, and __annotations__ attributes of f on g. This default list is in WRAPPER_ASSIGNMENTS, you can see it in the functools source.
it updates the __dict__ of g with all elements from f.__dict__. (see WRAPPER_UPDATES in the source)
it sets a new __wrapped__=f attribute on g

The consequence is that g appears as having the same name, docstring, module name, and signature than f. The only problem is that concerning the signature this is not actually true: it is just that inspect.signature follows wrapper chains by default. You can check it by using inspect.signature(g, follow_wrapped=False) as explained in the doc. This has annoying consequences:

the wrapper code will execute even when the provided arguments are invalid.
the wrapper code can not easily access an argument using its name, from the received *args, **kwargs. Indeed one would have to handle all cases (positional, keyword, default) and therefore to use something like Signature.bind().

Now there is a bit of confusion between functools.wraps and decorators, because a very frequent use case for developing decorators is to wrap functions. But both are completely independent concepts. If you're interested in understanding the difference, I implemented helper libraries for both: decopatch to write decorators easily, and makefun to provide a signature-preserving replacement for @wraps. Note that makefun relies on the same proven trick than the famous decorator library.

Simple way to encode a string according to a password?

The "encoded_c" mentioned in the @smehmood's Vigenere cipher answer should be "key_c".

Here are working encode/decode functions.

import base64
def encode(key, clear):
    enc = []
    for i in range(len(clear)):
        key_c = key[i % len(key)]
        enc_c = chr((ord(clear[i]) + ord(key_c)) % 256)
        enc.append(enc_c)
    return base64.urlsafe_b64encode("".join(enc))

def decode(key, enc):
    dec = []
    enc = base64.urlsafe_b64decode(enc)
    for i in range(len(enc)):
        key_c = key[i % len(key)]
        dec_c = chr((256 + ord(enc[i]) - ord(key_c)) % 256)
        dec.append(dec_c)
    return "".join(dec)

Disclaimer: As implied by the comments, this should not be used to protect data in a real application, unless you read this and don't mind talking with lawyers:

What's wrong with XOR encryption?

How to get names of enum entries?

As of TypeScript 2.4, enums can contain string intializers https://www.typescriptlang.org/docs/handbook/release-notes/typescript-2-4.html

This allows you to write:

 enum Order {
      ONE = "First",
      TWO = "Second"
 }

console.log(`One is ${Order.ONE.toString()}`);

and get this output:

One is First

jQuery move to anchor location on page load

Did you tried JQuery's scrollTo method? http://demos.flesler.com/jquery/scrollTo/

Or you can extend JQuery and add your custom mentod:

jQuery.fn.extend({
 scrollToMe: function () {
   var x = jQuery(this).offset().top - 100;
   jQuery('html,body').animate({scrollTop: x}, 400);
}});

Then you can call this method like:

$("#header").scrollToMe();

Multiple parameters in a List. How to create without a class?

To add to what other suggested I like the following construct to avoid the annoyance of adding members to keyvaluepair collections.

public class KeyValuePairList<Tkey,TValue> : List<KeyValuePair<Tkey,TValue>>{
    public void Add(Tkey key, TValue value){
        base.Add(new KeyValuePair<Tkey, TValue>(key, value));
    }
}

What this means is that the constructor can be initialized with better syntax::

var myList = new KeyValuePairList<int,string>{{1,"one"},{2,"two"},{3,"three"}};

I personally like the above code over the more verbose examples Unfortunately C# does not really support tuple types natively so this little hack works wonders.

If you find yourself really needing more than 2, I suggest creating abstractions against the tuple type.(although Tuple is a class not a struct like KeyValuePair this is an interesting distinction).

Curiously enough, the initializer list syntax is available on any IEnumerable and it allows you to use any Add method, even those not actually enumerable by your object. It's pretty handy to allow things like adding an object[] member as a params object[] member.

Go back button in a page

There's a few ways, this is one:

window.history.go(-1);

is there a 'block until condition becomes true' function in java?

You could use a semaphore.

While the condition is not met, another thread acquires the semaphore.
Your thread would try to acquire it with acquireUninterruptibly()
or tryAcquire(int permits, long timeout, TimeUnit unit) and would be blocked.

When the condition is met, the semaphore is also released and your thread would acquire it.

You could also try using a SynchronousQueue or a CountDownLatch.

HTML Input Type Date, Open Calendar by default

This is not possible with native HTML input elements. You can use webshim polyfill, which gives you this option by using this markup.

<input type="date" data-date-inline-picker="true" />

Here is a small demo

What is the difference between Multiple R-squared and Adjusted R-squared in a single-variate least squares regression?

Note that, in addition to number of predictive variables, the Adjusted R-squared formula above also adjusts for sample size. A small sample will give a deceptively large R-squared.

Ping Yin & Xitao Fan, J. of Experimental Education 69(2): 203-224, "Estimating R-squared shrinkage in multiple regression", compares different methods for adjusting r-squared and concludes that the commonly-used ones quoted above are not good. They recommend the Olkin & Pratt formula.

However, I've seen some indication that population size has a much larger effect than any of these formulas indicate. I am not convinced that any of these formulas are good enough to allow you to compare regressions done with very different sample sizes (e.g., 2,000 vs. 200,000 samples; the standard formulas would make almost no sample-size-based adjustment). I would do some cross-validation to check the r-squared on each sample.

How to make a SIMPLE C++ Makefile

I suggest (note that the indent is a TAB):

tool: tool.o file1.o file2.o
    $(CXX) $(LDFLAGS) $^ $(LDLIBS) -o $@

LINK.o = $(CXX) $(LDFLAGS) $(TARGET_ARCH)
tool: tool.o file1.o file2.o

The latter suggestion is slightly better since it reuses GNU Make implicit rules. However, in order to work, a source file must have the same name as the final executable (i.e.: tool.c and tool).

Notice, it is not necessary to declare sources. Intermediate object files are generated using implicit rule. Consequently, this Makefile work for C and C++ (and also for Fortran, etc...).

Also notice, by default, Makefile use $(CC) as the linker. $(CC) does not work for linking C++ object files. We modify LINK.o only because of that. If you want to compile C code, you don't have to force the LINK.o value.

Sure, you can also add your compilation flags with variable CFLAGS and add your libraries in LDLIBS. For example:

CFLAGS = -Wall
LDLIBS = -lm

One side note: if you have to use external libraries, I suggest to use pkg-config in order to correctly set CFLAGS and LDLIBS:

CFLAGS += $(shell pkg-config --cflags libssl)
LDLIBS += $(shell pkg-config --libs libssl)

The attentive reader will notice that this Makefile does not rebuild properly if one header is changed. Add these lines to fix the problem:

override CPPFLAGS += -MMD
include $(wildcard *.d)

-MMD allows to build .d files that contains Makefile fragments about headers dependencies. The second line just uses them.

For sure, a well written Makefile should also include clean and distclean rules:

clean:
    $(RM) *.o *.d

distclean: clean
    $(RM) tool

Notice, $(RM) is the equivalent of rm -f, but it is a good practice to not call rm directly.

The all rule is also appreciated. In order to work, it should be the first rule of your file:

all: tool

You may also add an install rule:

PREFIX = /usr/local
install:
    install -m 755 tool $(DESTDIR)$(PREFIX)/bin

DESTDIR is empty by default. The user can set it to install your program at an alternative system (mandatory for cross-compilation process). Package maintainers for multiple distribution may also change PREFIX in order to install your package in /usr.

One final word: Do not place source files in sub-directories. If you really want to do that, keep this Makefile in the root directory and use full paths to identify your files (i.e. subdir/file.o).

So to summarise, your full Makefile should look like:

LINK.o = $(CXX) $(LDFLAGS) $(TARGET_ARCH)
PREFIX = /usr/local
override CPPFLAGS += -MMD
include $(wildcard *.d)

all: tool
tool: tool.o file1.o file2.o
clean:
    $(RM) *.o *.d
distclean: clean
    $(RM) tool
install:
    install -m 755 tool $(DESTDIR)$(PREFIX)/bin

Is there a way to call a stored procedure with Dapper?

Here is code for getting value return from Store procedure

Stored procedure:

alter proc [dbo].[UserlogincheckMVC]    
@username nvarchar(max),    
@password nvarchar(max)
as    
begin    
    if exists(select Username from Adminlogin where Username =@username and Password=@password)    
        begin        
            return 1  
        end    
    else    
        begin     
            return 0  
        end    
end

Code:

var parameters = new DynamicParameters();
string pass = EncrytDecry.Encrypt(objUL.Password);
conx.Open();
parameters.Add("@username", objUL.Username);
parameters.Add("@password", pass);
parameters.Add("@RESULT", dbType: DbType.Int32, direction: ParameterDirection.ReturnValue);
var RS = conx.Execute("UserlogincheckMVC", parameters, null, null, commandType: CommandType.StoredProcedure);
int result = parameters.Get<int>("@RESULT");

Importing class from another file

Your problem is basically that you never specified the right path to the file.

Try instead, from your main script:

from folder.file import Klasa

Or, with from folder import file:

from folder import file
k = file.Klasa()

Or again:

import folder.file as myModule
k = myModule.Klasa()

What is the connection string for localdb for version 11

This is for others who would have struggled like me to get this working....I wasted more than half a day on a seemingly trivial thing...

If you want to use SQL Express 2012 LocalDB from VS2010 you must have this patch installed http://www.microsoft.com/en-us/download/details.aspx?id=27756

Just like mentioned in the comments above I too had Microsoft .NET Framework Version 4.0.30319 SP1Rel and since its mentioned everywhere that you need "Framework 4.0.2 or Above" I thought I am good to go...

However, when I explicitly downloaded that 4.0.2 patch and installed it I got it working....

Read/write to file using jQuery

Cookies are your best bet. Look for the jquery cookie plugin.

Cookies are designed for this sort of situation -- you want to keep some information about this client on client side. Just be aware that cookies are passed back and forth on every web request so you can't store large amounts of data in there. But just a simple answer to a question should be fine.

How to add new column to an dataframe (to the front not end)?

cbind inherents order by its argument order.

User your first column(s) as your first argument

cbind(fst_col , df)

  fst_col   df_col1   df_col2
1 0             0.2      -0.1
2 0             0.2      -0.1
3 0             0.2      -0.1
4 0             0.2      -0.1
5 0             0.2      -0.1

cbind(df, last_col)

  df_col1   df_col2  last_col
1 0.2      -0.1             0
2 0.2      -0.1             0
3 0.2      -0.1             0
4 0.2      -0.1             0
5 0.2      -0.1             0

How to change UINavigationBar background color from the AppDelegate

You can easily do this with Xcode 6.3.1. Select your NavigationBar in the Document outline. Select the Attributes Inspector. Uncheck Translucent. Set Bar Tint to your desired color. Done!

Xcode Project vs. Xcode Workspace - Differences

In brief

Xcode 3 introduced subproject, which is parent-child relationship, meaning that parent can reference its child target, but no vice versa
Xcode 4 introduced workspace, which is sibling relationship, meaning that any project can reference projects in the same workspace

Get domain name from given url

There is a similar question Extract main domain name from a given url. If you take a look at this answer , you will see that it is very easy. You just need to use java.net.URL and String utility - Split

How to display databases in Oracle 11g using SQL*Plus

Oracle does not have a simple database model like MySQL or MS SQL Server. I find the closest thing is to query the tablespaces and the corresponding users within them.

For example, I have a DEV_DB tablespace with all my actual 'databases' within them:

SQL> SELECT TABLESPACE_NAME FROM USER_TABLESPACES;

Resulting in:

SYSTEM
SYSAUX
UNDOTBS1
TEMP
USERS
EXAMPLE
DEV_DB

It is also possible to query the users in all tablespaces:

SQL> select USERNAME, DEFAULT_TABLESPACE from DBA_USERS;

Or within a specific tablespace (using my DEV_DB tablespace as an example):

SQL> select USERNAME, DEFAULT_TABLESPACE from DBA_USERS where DEFAULT_TABLESPACE = 'DEV_DB';

ROLES DEV_DB
DATAWARE DEV_DB
DATAMART DEV_DB
STAGING DEV_DB

How do I make an attributed string using Swift?

Swifter Swift has a pretty sweet way to do this without any work really. Just provide the pattern that should be matched and what attributes to apply to it. They're great for a lot of things check them out.

``` Swift
let defaultGenreText = NSAttributedString(string: "Select Genre - Required")
let redGenreText = defaultGenreText.applying(attributes: [NSAttributedString.Key.foregroundColor : UIColor.red], toRangesMatching: "Required")
``

If you have multiple places where this would be applied and you only want it to happen for specific instances then this method wouldn't work.

You can do this in one step, just easier to read when separated.

How to make the overflow CSS property work with hidden as value

Evidently, sometimes, the display properties of parent of the element containing the matter that shouldn't overflow should also be set to overflow:hidden as well, e.g.:

<div style="overflow: hidden">
  <div style="overflow: hidden">some text that should not overflow<div>
</div>

Why? I have no idea but it worked for me. See https://medium.com/@crrollyson/overflow-hidden-not-working-check-the-child-element-c33ac0c4f565 (ignore the sniping at stackoverflow!)

Struct memory layout in C

It's implementation-specific, but in practice the rule (in the absence of #pragma pack or the like) is:

Struct members are stored in the order they are declared. (This is required by the C99 standard, as mentioned here earlier.)
If necessary, padding is added before each struct member, to ensure correct alignment.
Each primitive type T requires an alignment of sizeof(T) bytes.

So, given the following struct:

struct ST
{
   char ch1;
   short s;
   char ch2;
   long long ll;
   int i;
};

ch1 is at offset 0
a padding byte is inserted to align...
s at offset 2
ch2 is at offset 4, immediately after s
3 padding bytes are inserted to align...
ll at offset 8
i is at offset 16, right after ll
4 padding bytes are added at the end so that the overall struct is a multiple of 8 bytes. I checked this on a 64-bit system: 32-bit systems may allow structs to have 4-byte alignment.

So sizeof(ST) is 24.

It can be reduced to 16 bytes by rearranging the members to avoid padding:

struct ST
{
   long long ll; // @ 0
   int i;        // @ 8
   short s;      // @ 12
   char ch1;     // @ 14
   char ch2;     // @ 15
} ST;

Sort CSV file by column priority using the "sort" command

Hibernate: How to fix "identifier of an instance altered from X to Y"?

If you are using Spring MVC or Spring Boot try to avoid: @ModelAttribute("user") in one controoler, and in other controller model.addAttribute("user", userRepository.findOne(someId);

This situation can produce such error.

MVC [HttpPost/HttpGet] for Action

Let's say you have a Login action which provides the user with a login screen, then receives the user name and password back after the user submits the form:

public ActionResult Login() {
    return View();
}

public ActionResult Login(string userName, string password) {
    // do login stuff
    return View();
}

MVC isn't being given clear instructions on which action is which, even though we can tell by looking at it. If you add [HttpGet] to the first action and [HttpPost] to the section action, MVC clearly knows which action is which.

Why? See Request Methods. Long and short: When a user views a page, that's a GET request and when a user submits a form, that's usually a POST request. HttpGet and HttpPost just restrict the action to the applicable request type.

[HttpGet]
public ActionResult Login() {
    return View();
}

[HttpPost]
public ActionResult Login(string userName, string password) {
    // do login stuff
    return View();
}

You can also combine the request method attributes if your action serves requests from multiple verbs:

[AcceptVerbs(HttpVerbs.Get | HttpVerbs.Post)].

VBA general way for pulling data out of SAP

This all depends on what sort of access you have to your SAP system. An ABAP program that exports the data and/or an RFC that your macro can call to directly get the data or have SAP create the file is probably best.

However as a general rule people looking for this sort of answer are looking for an immediate solution that does not require their IT department to spend months customizing their SAP system.

In that case you probably want to use SAP GUI Scripting. SAP GUI scripting allows you to automate the Windows SAP GUI in much the same way as you automate Excel. In fact you can call the SAP GUI directly from an Excel macro. Read up more on it here. The SAP GUI has a macro recording tool much like Excel does. It records macros in VBScript which is nearly identical to Excel VBA and can usually be copied and pasted into an Excel macro directly.

Example Code

Here is a simple example based on a SAP system I have access to.

Public Sub SimpleSAPExport()
  Set SapGuiAuto  = GetObject("SAPGUI") 'Get the SAP GUI Scripting object
  Set SAPApp = SapGuiAuto.GetScriptingEngine 'Get the currently running SAP GUI 
  Set SAPCon = SAPApp.Children(0) 'Get the first system that is currently connected
  Set session = SAPCon.Children(0) 'Get the first session (window) on that connection

  'Start the transaction to view a table
  session.StartTransaction "SE16"

  'Select table T001
  session.findById("wnd[0]/usr/ctxtDATABROWSE-TABLENAME").Text = "T001"
  session.findById("wnd[0]/tbar[1]/btn[7]").Press

  'Set our selection criteria
  session.findById("wnd[0]/usr/txtMAX_SEL").text = "2"
  session.findById("wnd[0]/tbar[1]/btn[8]").press

  'Click the export to file button
  session.findById("wnd[0]/tbar[1]/btn[45]").press

  'Choose the export format
  session.findById("wnd[1]/usr/subSUBSCREEN_STEPLOOP:SAPLSPO5:0150/sub:SAPLSPO5:0150/radSPOPLI-SELFLAG[1,0]").select
  session.findById("wnd[1]/tbar[0]/btn[0]").press

  'Choose the export filename
  session.findById("wnd[1]/usr/ctxtDY_FILENAME").text = "test.txt"
  session.findById("wnd[1]/usr/ctxtDY_PATH").text = "C:\Temp\"

  'Export the file
  session.findById("wnd[1]/tbar[0]/btn[0]").press
End Sub

Script Recording

To help find the names of elements such aswnd[1]/tbar[0]/btn[0] you can use script recording. Click the customize local layout button, it probably looks a bit like this:
Then find the Script Recording and Playback menu item.

Within that the More button allows you to see/change the file that the VB Script is recorded to. The output format is a bit messy, it records things like selecting text, clicking inside a text field, etc.

Edit: Early and Late binding

The provided script should work if copied directly into a VBA macro. It uses late binding, the line Set SapGuiAuto = GetObject("SAPGUI") defines the SapGuiAuto object.

If however you want to use early binding so that your VBA editor might show the properties and methods of the objects you are using, you need to add a reference to sapfewse.ocx in the SAP GUI installation folder.

Detect whether Excel workbook is already open

Dump a mysql database to a plaintext (CSV) backup from the command line

Check out mk-parallel-dump which is part of the ever-useful maatkit suite of tools. This can dump comma-separated files with the --csv option.

This can do your whole db without specifying individual tables, and you can specify groups of tables in a backupset table.

Note that it also dumps table definitions, views and triggers into separate files. In addition providing a complete backup in a more universally accessible form, it also immediately restorable with mk-parallel-restore

Detecting arrow key presses in JavaScript

event.key === "ArrowRight"...

More recent and much cleaner: use event.key. No more arbitrary number codes! If you are transpiling or know your users are all on modern browsers, use this!

node.addEventListener('keydown', function(event) {
    const key = event.key; // "ArrowRight", "ArrowLeft", "ArrowUp", or "ArrowDown"
});

Verbose Handling:

switch (event.key) {
    case "ArrowLeft":
        // Left pressed
        break;
    case "ArrowRight":
        // Right pressed
        break;
    case "ArrowUp":
        // Up pressed
        break;
    case "ArrowDown":
        // Down pressed
        break;
}

Modern Switch Handling:

const callback = {
    "ArrowLeft"  : leftHandler,
    "ArrowRight" : rightHandler,
    "ArrowUp"    : upHandler,
    "ArrowDown"  : downHandler,
}[event.key]
callback?.()

NOTE: The old properties (.keyCode and .which) are Deprecated.

`"w", "a", "s", "d"` for direction, use `event.code`

To support users who are using non-qwerty/English keyboard layouts, you should instead use event.code. This will preserve physical key location, even if resulting character changes.

event.key would be , on Dvorak and z on Azerty, making your game unplayable.

const {code} = event
if (code === "KeyW") // KeyA, KeyS, KeyD

Optimally, you also allow key remapping, which benefits the player regardless of their situation.

P.S. event.code is the same for arrows

key Mozilla Docs

code Mozilla Docs

Supported Browsers

How to change Format of a Cell to Text using VBA

To answer your direct question, it is:

Range("A1").NumberFormat = "@"

Cells(1,1).NumberFormat = "@"

However, I suggest making changing the format to what you actually want displayed. This allows you to retain the data type in the cell and easily use cell formulas to manipulate the data.

Selenium: Can I set any of the attribute value of a WebElement in Selenium?

I have created this jquery that solved my problem.

public void ChangeClassIntoSelected(String name,String div) {
        JavascriptExecutor js = (JavascriptExecutor) driver;
        js.executeScript("Array.from($(\"div." + div +" ul[name=" + name + "]\")[0].children).forEach((element, index) => {\n" +
                "   $(element).addClass('ui-selected');\n" +
                "});");
    }

With this script you are able to change the actual class name into some other thing.

How to find the socket buffer size of linux

For getting the buffer size in c/c++ program the following is the flow

int n;
unsigned int m = sizeof(n);
int fdsocket;
fdsocket = socket(AF_INET,SOCK_DGRAM,IPPROTO_UDP); // example
getsockopt(fdsocket,SOL_SOCKET,SO_RCVBUF,(void *)&n, &m);
// now the variable n will have the socket size

Initializing IEnumerable<string> In C#

IEnumerable is just an interface and so can't be instantiated directly.

You need to create a concrete class (like a List)

IEnumerable<string> m_oEnum = new List<string>() { "1", "2", "3" };

you can then pass this to anything expecting an IEnumerable.

ajax jquery simple get request

var dataString = "flag=fetchmediaaudio&id="+id;

$.ajax
({
  type: "POST",
  url: "ajax.php",
  data: dataString,
  success: function(html)
  {
     alert(html);
  }
});

OpenCV C++/Obj-C: Detecting a sheet of paper / Square Detection

Once you have detected the bounding box of the document, you can perform a four-point perspective transform to obtain a top-down birds eye view of the image. This will fix the skew and isolate only the desired object.

Input image:

Detected text object

Top-down view of text document

Code

from imutils.perspective import four_point_transform
import cv2
import numpy

# Load image, grayscale, Gaussian blur, Otsu's threshold
image = cv2.imread("1.png")
gray = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)
blur = cv2.GaussianBlur(gray, (7,7), 0)
thresh = cv2.threshold(blur, 0, 255, cv2.THRESH_BINARY + cv2.THRESH_OTSU)[1]

# Find contours and sort for largest contour
cnts = cv2.findContours(thresh, cv2.RETR_EXTERNAL,cv2.CHAIN_APPROX_SIMPLE)
cnts = cnts[0] if len(cnts) == 2 else cnts[1]
cnts = sorted(cnts, key=cv2.contourArea, reverse=True)
displayCnt = None

for c in cnts:
    # Perform contour approximation
    peri = cv2.arcLength(c, True)
    approx = cv2.approxPolyDP(c, 0.02 * peri, True)
    if len(approx) == 4:
        displayCnt = approx
        break

# Obtain birds' eye view of image
warped = four_point_transform(image, displayCnt.reshape(4, 2))

cv2.imshow("thresh", thresh)
cv2.imshow("warped", warped)
cv2.imshow("image", image)
cv2.waitKey()

Uninstall Django completely

The Issue is with pip --version or python --version.

try solving issue with pip2.7 uninstall Django command

If you are not able to uninstall using the above command then for sure your pip2.7 version is not installed so you can follow the below steps:

1)which pip2.7 it should give you an output like this :

/usr/local/bin/pip2.7

2) If you have not got this output please install pip using following commands

$ wget https://bootstrap.pypa.io/get-pip.py
$ sudo python2.7 get-pip.py

3) Now check your pip version : which pip2.7 Now you will get

/usr/local/bin/pip2.7 as output

4) uninstall Django using pip2.7 uninstall Django command.

Problem can also be related to Python version. I had a similar problem, this is how I uninstalled Django.

Issue occurred because I had multiple python installed in my virtual environment.

$ ls

activate       activate_this.py  easy_install-3.4  pip2.7  python     python3        wheel
activate.csh   easy_install      pip               pip3    python2    python3.4
activate.fish  easy_install-2.7  pip2              pip3.4  python2.7  python-config

Now when I tried to un-install using pip uninstall Django Django got uninstalled from python 2.7 but not from python 3.4 so I followed the following steps to resolve the issue :

1)alias python=/usr/bin/python3

2) Now check your python version using python -V command

3) If you have switched to your required python version now you can simply uninstall Django using pip3 uninstall Django command

Hope this answer helps.

how to call url of any other website in php

The simplest way would be to use FOpen or one of FOpen's Wrappers.

$page = file_get_contents("http://www.domain.com/filename");

This does require FOpen which some web hosts disable and some web hosts will allow FOpen, but not allow access to external files. You may want to check where you are going to run the script to see if you have access to External FOpen.

Stretch image to fit full container width bootstrap

Here's what worked for me. Note: Adding the image within a row introduces some space so I've intentionally used only a div to encapsulate the image.

<div class="container-fluid w-100 h-auto m-0 p-0">  

    <img src="someimg.jpg" class="img-fluid w-100 h-auto p-0 m-0" alt="Patience">           

</div>

How can I check if an argument is defined when starting/calling a batch file?

Get rid of the parentheses.

Sample batch file:

echo "%1"

if ("%1"=="") echo match1

if "%1"=="" echo match2

Output from running above script:

C:\>echo "" 
""

C:\>if ("" == "") echo match1 

C:\>if "" == "" echo match2 
match2

I think it is actually taking the parentheses to be part of the strings and they are being compared.

Access a JavaScript variable from PHP

_GET accesses query string variables, test is not a querystring variable (PHP does not process the JS in any way). You need to rethink. You could make a php variable $test, and do something like:

<?php
$test = "tester";
?>
<script type="text/javascript" charset="utf-8">
    var test = "<?php echo $test?>";
</script>

<?php
    echo $test;
?>

Of course, I don't know why you want this, so I'm not sure the best solution.

EDIT: As others have noted, if the JavaScript variable is really generated on the client, you will need AJAX or a form to send it to the server.

Invalid default value for 'create_date' timestamp field

To avoid this issue, you need to remove NO_ZERO_DATE from the mysql mode configuration.

Go to 'phpmyadmin'.
Once phpmyadmin is loaded up, click on the 'variables' tab.
Search for 'sql mode'.
Click on the Edit option and remove NO_ZERO_DATE (and its trailing comma) from the configuration.

This is a very common issue in the local environment with wamp or xamp.

Working with time DURATION, not time of day

I don't know how to make the chart label the axis in the format "X1 min : X2 sec", but here's another way to get durations, in the format of minutes with decimals representing seconds (.5 = 30 sec, .25 = 15 sec, etc.)

Suppose in column A you have your time data, for example in cell A1 you have 12:03:06, which your 3min 6sec data misinterpreted as 3:06 past midnight, and column B is free.

In cell B1 enter this formula: =MINUTE(A1) + SECOND(A1)/60 and hit enter/return. Grab the lower right corner of cell B2 and drag as far down as the A column goes to apply the formula to all data in col A.

Last step, be sure to highlight all of column B and set it to Number format (the application of the formula may have automatically set format to Time).

lvalue required as left operand of assignment

You are trying to assign a value to a function, which is not possible in C. Try the comparison operator instead:

if (strcmp("hello", "hello") == 0)

Check if value exists in column in VBA

try this:

If Application.WorksheetFunction.CountIf(RangeToSearchIn, ValueToSearchFor) = 0 Then
Debug.Print "none"
End If

Subtract 1 day with PHP

Answear taken from Php manual strtotime function comments :

echo date( "Y-m-d", strtotime( "2009-01-31 -1 day"));

$date = "2009-01-31";
echo date( "Y-m-d", strtotime( $date . "-1 day"));

JPA OneToMany not deleting child

You can try this:

@OneToOne(cascade = CascadeType.REFRESH)

@OneToMany(cascade = CascadeType.REFRESH)

AngularJS - Any way for $http.post to send request parameters instead of JSON?

Syntax for AngularJS v1.4.8 + (v1.5.0)

       $http.post(url, data, config)
            .then(
                    function (response) {
                        // success callback
                    },
                    function (response) {
                        // failure callback
                    }
            );

Eg:

    var url = "http://example.com";

    var data = {
        "param1": "value1",
        "param2": "value2",
        "param3": "value3"
    };

    var config = {
        headers: {
            'Content-Type': "application/json"
        }
    };

    $http.post(url, data, config)
            .then(
                    function (response) {
                        // success callback
                    },
                    function (response) {
                        // failure callback
                    }
            );

How to remove only 0 (Zero) values from column in excel 2010

I selected columns that I want to delete 0 values then clicked DATA > FILTER. In column's header there is a filter icon appears. I clicked on that icon and selected only 0 values and clicked OK. Only 0 values becomes selected. Finally clear content OR use DELETE button.

Then to remove the blank rows from the deleted 0 values removed. I click DATA > FILTER I clicked on that filter icon and unselected blanks copy and paste the remaining data into a new sheet.

og:type and valid values : constantly being parsed as og:type=website

This started happening to my site after I enabled namespace and custom Open Graph actions and objects. Once you enable it, you lose support for standard object types such as bar, or in my case article. (or it's possible Facebook may have deprecated certain types, I'm not 100% sure) When no supported type is specified, Facebook defaults to website.

To fix this what you need to do is go into your app dashboard, select your app, then go to the Open Graph section. Under "Object Types", define your own types, such as "bar."

Next you will have to change your meta tags to look like this:

<meta property="og:type" content="your_namespace:your_object_type" />

If you click on "Get Code" next to the object type in the dashboard, Facebook will provide you with an example of meta tags to use.

How to set the background image of a html 5 canvas to .png image

As shown in this example, you can apply a background to a canvas element through CSS and this background will not be considered part the image, e.g. when fetching the contents through toDataURL().

Here are the contents of the example, for Stack Overflow posterity:

<!DOCTYPE HTML>
<html><head>
  <meta charset="utf-8">
  <title>Canvas Background through CSS</title>
  <style type="text/css" media="screen">
    canvas, img { display:block; margin:1em auto; border:1px solid black; }
    canvas { background:url(lotsalasers.jpg) }
  </style>
</head><body>
<canvas width="800" height="300"></canvas>
<img>
<script type="text/javascript" charset="utf-8">
  var can = document.getElementsByTagName('canvas')[0];
  var ctx = can.getContext('2d');
  ctx.strokeStyle = '#f00';
  ctx.lineWidth   = 6;
  ctx.lineJoin    = 'round';
  ctx.strokeRect(140,60,40,40);
  var img = document.getElementsByTagName('img')[0];
  img.src = can.toDataURL();
</script>
</body></html>

Set focus on <input> element

I'm going to weigh in on this (Angular 7 Solution)

input [appFocus]="focus"....

import {AfterViewInit, Directive, ElementRef, Input,} from '@angular/core';

@Directive({
  selector: 'input[appFocus]',
})
export class FocusDirective implements AfterViewInit {

  @Input('appFocus')
  private focused: boolean = false;

  constructor(public element: ElementRef<HTMLElement>) {
  }

  ngAfterViewInit(): void {
    // ExpressionChangedAfterItHasBeenCheckedError: Expression has changed after it was checked.
    if (this.focused) {
      setTimeout(() => this.element.nativeElement.focus(), 0);
    }
  }
}

PHP: Possible to automatically get all POSTed data?

Sure. Just walk through the $_POST array:

foreach ($_POST as $key => $value) {
    echo "Field ".htmlspecialchars($key)." is ".htmlspecialchars($value)."<br>";
}

Request redirect to /Account/Login?ReturnUrl=%2f since MVC 3 install on server

Be ware with this:

RegisterGlobalFilters(GlobalFilterCollection filters) {
  filters.Add(new System.Web.Mvc.AuthorizeAttribute());
}

enabling cross-origin resource sharing on IIS7

It is likely a case of IIS 7 'handling' the HTTP OPTIONS response instead of your application specifying it. To determine this, in IIS7,

Go to your site's Handler Mappings.
Scroll down to 'OPTIONSVerbHandler'.
Change the 'ProtocolSupportModule' to 'IsapiHandler'
Set the executable: %windir%\Microsoft.NET\Framework\v4.0.30319\aspnet_isapi.dll

Now, your config entries above should kick in when an HTTP OPTIONS verb is sent.

Alternatively you can respond to the HTTP OPTIONS verb in your BeginRequest method.

    protected void Application_BeginRequest(object sender,EventArgs e)
    {
        HttpContext.Current.Response.AddHeader("Access-Control-Allow-Origin", "*");

        if(HttpContext.Current.Request.HttpMethod == "OPTIONS")
        {
            //These headers are handling the "pre-flight" OPTIONS call sent by the browser
            HttpContext.Current.Response.AddHeader("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE");
            HttpContext.Current.Response.AddHeader("Access-Control-Allow-Headers", "Content-Type, Accept");
            HttpContext.Current.Response.AddHeader("Access-Control-Max-Age", "1728000" );
            HttpContext.Current.Response.End();
        }

    }

Constants in Kotlin -- what's a recommended way to create them?

There are a few ways you can define constants in Kotlin,

Using companion object

    companion object {
        const val ITEM1 = "item1"
        const val ITEM2 = "item2"
    }

you can use above companion object block inside any class and define all your fields inside this block itself. But there is a problem with this approach, the documentation says,

even though the members of companion objects look like static members in other languages, at runtime those are still instance members of real objects, and can, for example, implement interfaces.

When you create your constants using companion object, and see the decompiled bytecode, you'll something like below,

  ClassName.Companion Companion = ClassName.Companion.$$INSTANCE;
  @NotNull
  String ITEM1 = "item1";
  @NotNull
  String ITEM2 = "item2";

  public static final class Companion {
     @NotNull
     private static final String ITEM1 = "item1";
     @NotNull
     public static final String ITEM2 = "item2";

     // $FF: synthetic field
     static final ClassName.Companion $$INSTANCE;

     private Companion() {
     }

     static {
        ClassName.Companion var0 = new ClassName.Companion();
        $$INSTANCE = var0;
     }
  }

From here you can easily see what the documentation said, even though the members of companion objects look like static members in other languages, at runtime those are still instance members of real objects It's doing extra work than required.

Now comes another way, where we don't need to use companion object like below,

object ApiConstants {
      val ITEM1: String = "item1"
 }

Again if you see the decompiled version of the byte code of above snippet, you'll find something like this,

public final class ApiConstants {
     private static final String ITEM1 = "item1";

     public static final ApiConstants INSTANCE;

     public final String getITEM1() {
           return ITEM1;
      }

     private ApiConstants() {
      }

     static {
         ApiConstants var0 = new ApiConstants();
         INSTANCE = var0;
         CONNECT_TIMEOUT = "item1";
      }
    }

Now if you see the above decompiled code, it's creating get method for each variable. This get method is not required at all.

To get rid of these get methods, you should use const before val like below,

object ApiConstants {
     const val ITEM1: String = "item1"
 }

Now if you see the decompiled code of above snippet, you'll find it easier to read as it does the least background conversion for your code.

public final class ApiConstants {
    public static final String ITEM1 = "item1";
    public static final ApiConstants INSTANCE;

    private ApiConstants() {
     }

    static {
        ApiConstants var0 = new ApiConstants();
        INSTANCE = var0;
      }
    }

So this is the best way to create constants.

How to see remote tags?

Even without cloning or fetching, you can check the list of tags on the upstream repo with git ls-remote:

git ls-remote --tags /url/to/upstream/repo

(as illustrated in "When listing git-ls-remote why there's “^{}” after the tag name?")

xbmono illustrates in the comments that quotes are needed:

git ls-remote --tags /some/url/to/repo "refs/tags/MyTag^{}"

Note that you can always push your commits and tags in one command with (git 1.8.3+, April 2013):

git push --follow-tags

See Push git commits & tags simultaneously.

Regarding Atlassian SourceTree specifically:

Note that, from this thread, SourceTree ONLY shows local tags.

There is an RFE (Request for Enhancement) logged in SRCTREEWIN-4015 since Dec. 2015.

A simple workaround:

see a list of only unpushed tags?

git push --tags

or check the "Push all tags" box on the "Push" dialog box, all tags will be pushed to your remote.

That way, you will be "sure that they are present in remote so that other developers can pull them".

How to remove a class from elements in pure JavaScript?

Find elements:

var elements = document.getElementsByClassName('widget hover');

Since elements is a live array and reflects all dom changes you can remove all hover classes with a simple while loop:

while(elements.length > 0){
    elements[0].classList.remove('hover');
}

Detect WebBrowser complete page loading

You can use the event ProgressChanged ; the last time it is raised will indicate that the document is fully rendered:

this.webBrowser.ProgressChanged += new
WebBrowserProgressChangedEventHandler(webBrowser_ProgressChanged);

When to use Task.Delay, when to use Thread.Sleep?

Use Thread.Sleep when you want to block the current thread.

Use Task.Delay when you want a logical delay without blocking the current thread.

Efficiency should not be a paramount concern with these methods. Their primary real-world use is as retry timers for I/O operations, which are on the order of seconds rather than milliseconds.

Tab Escape Character?

For someone who needs quick reference of C# Escape Sequences that can be used in string literals:

\t Horizontal tab (ASCII code value: 9)

\n Line feed (ASCII code value: 10)

\r Carriage return (ASCII code value: 13)

\' Single quotation mark

\" Double quotation mark

\\ Backslash

\? Literal question mark

\x12 ASCII character in hexadecimal notation (e.g. for 0x12)

\x1234 Unicode character in hexadecimal notation (e.g. for 0x1234)

It's worth mentioning that these (in most cases) are universal codes. So \t is 9 and \n is 10 char value on Windows and Linux. But newline sequence is not universal. On Windows it's \n\r and on Linux it's just \n. That's why it's best to use Environment.Newline which gets adjusted to current OS settings. With .Net Core it gets really important.

is it possible to update UIButton title/text programmatically?

Even though Caffeine Coma's issue was resolved, I would like to offer another potential cause for the title not showing up on a UIButton.

If you set an image for the UIButton using

- (void)setImage:(UIImage *)image forState:(UIControlState)state

It can cover the title. I found this out the hard way and imagine some of you end up reading this page for the same reason.

Use this method instead

- (void)setBackgroundImage:(UIImage *)image forState:(UIControlState)state

for the button image and the title will not be affected.

I tested this with programmatically created buttons and buttons created in a .xib

Using curl POST with variables defined in bash script functions

You don't need to pass the quotes enclosing the custom headers to curl. Also, your variables in the middle of the data argument should be quoted.

First, write a function that generates the post data of your script. This saves you from all sort of headaches concerning shell quoting and makes it easier to read an maintain the script than feeding the post data on curl's invocation line as in your attempt:

generate_post_data()
{
  cat <<EOF
{
  "account": {
    "email": "$email",
    "screenName": "$screenName",
    "type": "$theType",
    "passwordSettings": {
      "password": "$password",
      "passwordConfirm": "$password"
    }
  },
  "firstName": "$firstName",
  "lastName": "$lastName",
  "middleName": "$middleName",
  "locale": "$locale",
  "registrationSiteId": "$registrationSiteId",
  "receiveEmail": "$receiveEmail",
  "dateOfBirth": "$dob",
  "mobileNumber": "$mobileNumber",
  "gender": "$gender",
  "fuelActivationDate": "$fuelActivationDate",
  "postalCode": "$postalCode",
  "country": "$country",
  "city": "$city",
  "state": "$state",
  "bio": "$bio",
  "jpFirstNameKana": "$jpFirstNameKana",
  "jpLastNameKana": "$jpLastNameKana",
  "height": "$height",
  "weight": "$weight",
  "distanceUnit": "MILES",
  "weightUnit": "POUNDS",
  "heightUnit": "FT/INCHES"
}
EOF
}

It is then easy to use that function in the invocation of curl:

curl -i \
-H "Accept: application/json" \
-H "Content-Type:application/json" \
-X POST --data "$(generate_post_data)" "https://xxx:[email protected]/xxxxx/xxxx/xxxx"

This said, here are a few clarifications about shell quoting rules:

The double quotes in the -H arguments (as in -H "foo bar") tell bash to keep what's inside as a single argument (even if it contains spaces).

The single quotes in the --data argument (as in --data 'foo bar') do the same, except they pass all text verbatim (including double quote characters and the dollar sign).

To insert a variable in the middle of a single quoted text, you have to end the single quote, then concatenate with the double quoted variable, and re-open the single quote to continue the text: 'foo bar'"$variable"'more foo'.

Embed youtube videos that play in fullscreen automatically

This was pretty well answered over here: How to make a YouTube embedded video a full page width one?

If you add '?rel=0&autoplay=1' to the end of the url in the embed code (like this)

<iframe id="video" src="//www.youtube.com/embed/5iiPC-VGFLU?rel=0&autoplay=1" frameborder="0" allowfullscreen></iframe>

of the video it should play on load. Here's a demo over at jsfiddle.

Java System.out.print formatting

Since you are using Java, printf is available from version 1.5

You may use it like this

System.out.printf("%03d ", x);

For Example:

System.out.printf("%03d ", 5);
System.out.printf("%03d ", 55);
System.out.printf("%03d ", 555);

Will Give You

005 055 555

as output

See: System.out.printf and Format String Syntax

How to make a circle around content using CSS?

Remove ListView items in Android

int count = adapter.getCount();
for (int i = 0; i < count; i++) {
 adapter.remove(adapter.getItem(i));
}

then call notifyDataSetChanged();

iOS 7 - Failing to instantiate default view controller

Apart from above correct answer, also make sure that you have set correct Main Interface in General.

Html5 Full screen video

No, there is no way to do this yet. I wish they add a future like this in browsers.

EDIT:

Now there is a Full Screen API for the web You can requestFullscreen on an Video or Canvas element to ask user to give you permisions and make it full screen.

Let's consider this element:

<video controls id="myvideo">
  <source src="somevideo.webm"></source>
  <source src="somevideo.mp4"></source>
</video>

We can put that video into fullscreen mode with script like this:

var elem = document.getElementById("myvideo");
if (elem.requestFullscreen) {
  elem.requestFullscreen();
} else if (elem.mozRequestFullScreen) {
  elem.mozRequestFullScreen();
} else if (elem.webkitRequestFullscreen) {
  elem.webkitRequestFullscreen();
} else if (elem.msRequestFullscreen) { 
  elem.msRequestFullscreen();
}

Full documentation

UITextView that expands to text using auto layout

vitaminwater's answer is working for me.

If your textview's text is bouncing up and down during edit, after setting [textView setScrollEnabled:NO];, set Size Inspector > Scroll View > Content Insets > Never.

Hope it helps.

How to set iPhone UIView z index?

Within the view you want to bring to the top... (in swift)

superview?.bringSubviewToFront(self)

List All Google Map Marker Images

var pinIcon = new google.maps.MarkerImage(
    "http://chart.apis.google.com/chart?chst=d_map_pin_letter&chld=%E2%80%A2|00D900",
    null, /* size is determined at runtime */
    null, /* origin is 0,0 */
    null, /* anchor is bottom center of the scaled image */
    new google.maps.Size(12, 18)
);

How do I put double quotes in a string in vba?

Another work-around is to construct a string with a temporary substitute character. Then you can use REPLACE to change each temp character to the double quote. I use tilde as the temporary substitute character.

Here is an example from a project I have been working on. This is a little utility routine to repair a very complicated formula if/when the cell gets stepped on accidentally. It is a difficult formula to enter into a cell, but this little utility fixes it instantly.

Sub RepairFormula()
Dim FormulaString As String

FormulaString = "=MID(CELL(~filename~,$A$1),FIND(~[~,CELL(~filename~,$A$1))+1,FIND(~]~, CELL(~filename~,$A$1))-FIND(~[~,CELL(~filename~,$A$1))-1)"
FormulaString = Replace(FormulaString, Chr(126), Chr(34)) 'this replaces every instance of the tilde with a double quote.
Range("WorkbookFileName").Formula = FormulaString

This is really just a simple programming trick, but it makes entering the formula in your VBA code pretty easy.

How to group pandas DataFrame entries by date in a non-unique column

I'm using pandas 0.16.2. This has better performance on my large dataset:

data.groupby(data.date.dt.year)

Using the dt option and playing around with weekofyear, dayofweek etc. becomes far easier.

Can I hide the HTML5 number input’s spin box?

Try using input type="tel" instead. It pops up a keyboard with numbers, and it doesn’t show spin boxes. It requires no JavaScript or CSS or plugins or anything else.

How to read barcodes with the camera on Android?

With Google Firebase ML Kit's barcode scanning API, you can read data encoded using most standard barcode formats.

https://firebase.google.com/docs/ml-kit/read-barcodes?authuser=0

You can follow this link to read barcodes efficiently.

ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2)

An advice: Always ask MySQL what the problem is. In my case, less /var/log/mysql/error.log and see this:

2015-07-28 12:01:48 23224 [ERROR] /usr/sbin/mysqld: unknown variable 'log_slow_queries=/var/log/mysql/mysql-slow.log'
2015-07-28 12:01:48 23224 [ERROR] Aborting

It is complaining, because I uncommented this option in my.cnf, but after commenting this option, it started without any problem.

Limit Get-ChildItem recursion depth

@scanlegentil I like this.
A little improvement would be:

$Depth = 2
$Path = "."

$Levels = "\*" * $Depth
$Folder = Get-Item $Path
$FolderFullName = $Folder.FullName
Resolve-Path $FolderFullName$Levels | Get-Item | ? {$_.PsIsContainer} | Write-Host

As mentioned, this would only scan the specified depth, so this modification is an improvement:

$StartLevel = 1 # 0 = include base folder, 1 = sub-folders only, 2 = start at 2nd level
$Depth = 2      # How many levels deep to scan
$Path = "."     # starting path

For ($i=$StartLevel; $i -le $Depth; $i++) {
    $Levels = "\*" * $i
    (Resolve-Path $Path$Levels).ProviderPath | Get-Item | Where PsIsContainer |
    Select FullName
}

Case insensitive regular expression without re.compile?

If you would like to replace but still keeping the style of previous str. It is possible.

For example: highlight the string "test asdasd TEST asd tEst asdasd".

sentence = "test asdasd TEST asd tEst asdasd"
result = re.sub(
  '(test)', 
  r'<b>\1</b>',  # \1 here indicates first matching group.
  sentence, 
  flags=re.IGNORECASE)

test asdasd TEST asd tEst asdasd

AVD Manager - No system image installed for this target

Open your Android SDK Manager and ensure that you download/install a system image for the API level you are developing with.

How to align two elements on the same line without changing HTML

This is what I used for similar type of use case as yours.

<style type="text/css">
#element1 {display:inline-block; width:45%; padding:10px}
#element2 {display:inline-block; width:45%; padding:10px}
</style>

<div id="element1">
 element 1 markup
</div>
<div id="element2">
 element 2 markup
</div>

Adjust your width and padding as per your requirement. Note - Do not exceed 'width' more than 100% altogether (ele1_width+ ele2_width) to add 'padding', keep it less than 100%.

How to fill in form field, and submit, using javascript?

document.getElementById('username').value = 'foo';
document.getElementById('login_form').submit();

AWS S3: how do I see how much disk space is using

Cloud watch also allows you to create metrics for your S3 bucket. It shows you metrics by the size and object count. Services> Management Tools> Cloud watch. Pick the region where your S3 bucket is and the size and object count metrics would be among those available metrics.

Update a column in MySQL

if you want to fill all the column:

update 'column' set 'info' where keyID!=0;

Executing Javascript from Python

You can use js2py context to execute your js code and get output from document.write with mock document object:

import js2py

js = """
var output;
document = {
    write: function(value){
        output = value;
    }
}
""" + your_script

context = js2py.EvalJs()
context.execute(js)
print(context.output)

Creating a Zoom Effect on an image on hover using CSS?

_x000D_

    .img-wrap:hover img {_x000D_
        transform: scale(0.8);_x000D_
    }_x000D_
    .img-wrap img {_x000D_
        display: block;_x000D_
        transition: all 0.3s ease 0s;_x000D_
        width: 100%;_x000D_
    }

_x000D_

    <div class="img-wrap">_x000D_
    <img src="http://www.sampleimages/images.jpg"/> // Your image_x000D_
    </div>

_x000D_

This code is only for zoom-out effect.Set the div "img-wrap" according to your styles and insert the above style results zoom-out effect.For zoom-in effect you must increase the scale value(eg: for zoom-in,use transform: scale(1.3);

Unable to resolve host "<URL here>" No address associated with host name

Check permission for INTERNET in mainfest file and check network connectivity.

Stock ticker symbol lookup API

Use YQL and you don't need to worry. It's a query language by Yahoo and you can get all the stock data including the name of the company for the ticker. It's a REST API and it returns the results via XML or JSON. I have a full tutorial and source code on my site take a look: http://www.jarloo.com/yahoo-stock-symbol-lookup/

What is the documents directory (NSDocumentDirectory)?

This has changed in iOS 8. See the following tech note: https://developer.apple.com/library/ios/technotes/tn2406/_index.html

The Apple sanctioned way (from the link above) is as follows:

// Returns the URL to the application's Documents directory.
- (NSURL *)applicationDocumentsDirectory
{
    return [[[NSFileManager defaultManager] URLsForDirectory:NSDocumentDirectory inDomains:NSUserDomainMask] lastObject];
}

Count number of columns in a table row

If the colspan or rowspan is all set to 1, counting the children tds will give the correct answer. However, if there are spans, we cannot count the number of columns exactly, even by the maximum number of tds of the rows. Consider the following example:

_x000D_

var mytable = document.getElementById('table')_x000D_
for (var i=0; i < mytable.rows.length; ++i) {_x000D_
 document.write(mytable.rows[i].cells.length + "<br>");_x000D_
}

_x000D_

table, th, td {_x000D_
  border: 1px solid black;_x000D_
  border-collapse: collapse;_x000D_
  padding: 3px;_x000D_
}

_x000D_

<table id="table">_x000D_
    <thead>_x000D_
        <tr>_x000D_
            <th colspan="2">Header</th>_x000D_
            <th rowspan="2">Hi</th>_x000D_
        </tr>_x000D_
        <tr>_x000D_
            <th>Month</th>_x000D_
            <th>Savings</th>_x000D_
        </tr>_x000D_
    </thead>_x000D_
    <tbody>_x000D_
        <tr>_x000D_
            <td colspan="2">hello</td>_x000D_
            <td>world</td>_x000D_
        </tr>_x000D_
        <tr>_x000D_
            <td>hello</td>_x000D_
            <td colspan="2">again</td>_x000D_
        </tr>_x000D_
    </tbody>_x000D_
</table>

_x000D_

Could not load file or assembly '***.dll' or one of its dependencies

I had the same issue with a dll yesterday and all it referenced was System, System.Data, and System.Xml. Turns out the build configuration for the Platform type didn't line up. The dll was build for x86 and the program using it was "Any CPU" and since I am running a x64 machine, it ran the program as x64 and had issues with the x86 dll. I don't know if this is your issue or not, just thought that I would mention it as something else to check.

Most Useful Attributes

// on configuration sections
[ConfigurationProperty] 

// in asp.net
[NotifyParentProperty(true)]

How to insert a file in MySQL database?

The other answers will give you a good idea how to accomplish what you have asked for....

However

There are not many cases where this is a good idea. It is usually better to store only the filename in the database and the file on the file system.

That way your database is much smaller, can be transported around easier and more importantly is quicker to backup / restore.

How to get all Windows service names starting with a common word?

Using PowerShell, you can use the following

Get-Service | Where-Object {$_.displayName.StartsWith("NATION-")} | Select name

This will show a list off all services which displayname starts with "NATION-".

You can also directly stop or start the services;

Get-Service | Where-Object {$_.displayName.StartsWith("NATION-")} | Stop-Service
Get-Service | Where-Object {$_.displayName.StartsWith("NATION-")} | Start-Service

or simply

Get-Service | Where-Object {$_.displayName.StartsWith("NATION-")} | Restart-Service

phpmyadmin logs out after 1440 secs

===method 1 with http login===

[php.ini]
session.gc_maxlifetime = 86400

[config.inc.php]

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

===method 2 with cookie login===

[php.ini]

session.gc_maxlifetime = 86400

[config.inc.php]

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

$cfg['Servers'][$i]['LoginCookieValidity'] = 86400;

$cfg['Servers'][$i]['pmadb']         = 'phpmyadmin';

$cfg['Servers'][$i]['controluser']   = 'phpmyadmin_pma';

$cfg['Servers'][$i]['controlpass']   = 'nigookike';

$cfg['Servers'][$i]['userconfig'] = 'pma__userconfig'; // there's a lot of other table required for full functionality,
                                                                         // all others can be left out unconfig except this one

[mysql]
-import phpMyAdmin/sql/create_tables.sql

-grant PRIVILEGES to phpmyadmin_pma as below

db/table

phpmyadmin  ALL PRIVILEGES 

mysql/db    SELECT

mysql/host  SELECT

mysql/tables_priv   USAGE

mysql/user  USAGE


-clear all entries should old one exists

phpmyadmin/pma__userconfig

[webUI]

-clear broswer cookie

-as normal mysql user, access http://mysql/phpmyadmin , at the bottom of page:

    The phpMyAdmin configuration storage is not completely configured, some extended features have been deactivated. [Find out why.]

-near top of the page

    [Create missing phpMyAdmin configuration storage tables.]

-access http://mysql/phpmyadmin > settings > features > Login cookie validity > 86400 > [apply]

-check phpmyadmin/pma__userconfig contain new entries of aforemention mysql user

N.B.

every user has independent setting and [webUI] procedure has to be repeated for each user
if "The phpMyAdmin configuration storage is not completely configured, some extended features have been deactivated. [Find out why.]"

link does not appears on frontpage, go settings > features > warnings > Missing phpMyAdmin configuration storage tables > [refresh] a few times will make it appears

Convert Linq Query Result to Dictionary

Looking at your example, I think this is what you want:

var dict = TableObj.ToDictionary(t => t.Key, t=> t.TimeStamp);

How to get ID of button user just clicked?

With pure javascript:

var buttons = document.getElementsByTagName("button");
var buttonsCount = buttons.length;
for (var i = 0; i <= buttonsCount; i += 1) {
    buttons[i].onclick = function(e) {
        alert(this.id);
    };
}?

http://jsfiddle.net/TKKBV/2/

Submit a form in a popup, and then close the popup

Here's how I ended up doing this:

        <div id="divform">
            <form action="/system/wpacert" method="post" enctype="multipart/form-data" name="certform">
                <div>Certificate 1: <input type="file" name="cert1"/></div>
                <div>Certificate 2: <input type="file" name="cert2"/></div>

                <div><input type="button" value="Upload" onclick="closeSelf();"/></div>
            </form>
        </div>
        <div  id="closelink" style="display:none">
            <a href="javascript:window.close()">Click Here to Close this Page</a>
        </div>

function closeSelf(){
    document.forms['certform'].submit();
    hide(document.getElementById('divform'));
    unHide(document.getElementById('closelink'));

}

Where hide() and unhide() set the style.display to 'none' and 'block' respectively.

Not exactly what I had in mind, but this will have to do for the time being. Works on IE, Safari, FF and Chrome.

Html.EditorFor Set Default Value

The clean way to do so is to pass a new instance of the created entity through the controller:

//GET
public ActionResult CreateNewMyEntity(string default_value)
{
    MyEntity newMyEntity = new MyEntity();
    newMyEntity._propertyValue = default_value;

    return View(newMyEntity);
}

If you want to pass the default value through ActionLink

@Html.ActionLink("Create New", "CreateNewMyEntity", new { default_value = "5" })

Best way to incorporate Volley (or other library) into Android Studio project

Nowadays

dependencies {
    compile 'com.android.volley:volley:1.0.0'
}

A lot of different ways to do it back in the day (original answer)

Add volley.jar as library
1. Download it from: http://api.androidhive.info/volley/volley.jar
2. Place it in your [MyProjectPath]/app/libs/ folder

Use the source files from git (a rather manual/general way described here)
1. Download / install the git client (if you don't have it on your system yet): http://git-scm.com/downloads (or via git clone https://github.com/git/git ... sry bad one, but couldn't resist ^^)
2. Execute git clone https://android.googlesource.com/platform/frameworks/volley
3. Copy the com folder from within [path_where_you_typed_git_clone]/volley/src to your projects app/src/main/java folder (Integrate it instead, if you already have a com folder there!! ;-))
The files show up immediately in Android Studio. For Eclipse you will have to right-click on the src folder and press refresh (or F5) first.

Use gradle via the "unofficial" maven mirror
1. In your project's src/build.gradle file add following volley dependency:
```
dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    // ...

    compile 'com.mcxiaoke.volley:library:1.+'
}
```
2. Click on Try Again which should right away appear on the top of the file, or just Build it if not
The main "advantage" here is, that this will keep the version up to date for you, whereas in the other two cases you would have to manually update volley.

On the "downside" it is not officially from google, but a third party weekly mirror.

But both of these points, are really relative to what you would need/want. Also if you don't want updates, just put the desired version there instead e.g. compile 'com.mcxiaoke.volley:library:1.0.7'.

Sorting a list using Lambda/Linq to objects

This is how I solved my problem:

List<User> list = GetAllUsers();  //Private Method

if (!sortAscending)
{
    list = list
           .OrderBy(r => r.GetType().GetProperty(sortBy).GetValue(r,null))
           .ToList();
}
else
{
    list = list
           .OrderByDescending(r => r.GetType().GetProperty(sortBy).GetValue(r,null))
           .ToList();
}

get unique machine id

If you need a unique ID, you must first decide on your definition of unique. If you want/intend to use it for a copy-protection mechanism, then use something simple. This is because if someone really wants to use your software, (s)he will find a way to break your protection, given enough time and skill. In the case of a unique hardware ID, just think about virtual machines and you'll see that it is possible to spoof anything so someone can tamper with your software.

There is not much you can take from a PC and consider it as uniqueness over its whole lifetime. (Hardware changes will most likely require regenerating the ID at some point.) If you need something like that, you should investigate using an authentication USB Dongle which you can send to your customers.

If you just need some unique identifier that is not as hard to obtain, you could take the MAC address (unreliable), the OS serial number or the domain and user's name, but all of them are susceptible to forgery. However, if your main goal is to lock out unauthorised people, you won't sell anything because no one will want to use your software if it is hard to install, register or to move from one PC to another, although the last consideration is part and parcel of per-machine licensing. (This will likely happen quite often.)

As a first step, make it easy: Use something simple which is not easy to spoof in your target group. (For example, domain and user names can't be easily spoofed by enterprise customers, because their PCs are running in a larger environment implementing policies, etc.) Just forget about the others until you have that.

Maybe you can lock them out but that doesn't mean they're going to buy your software; they just won't use it anymore. What you have to consider is how many potential customers won't be or aren't willing to pay because you made it so complicated to use your program.

how to remove untracked files in Git?

Those are untracked files. This means git isn't tracking them. It's only listing them because they're not in the git ignore file. Since they're not being tracked by git, git reset won't touch them.

If you want to blow away all untracked files, the simplest way is git clean -f (use git clean -n instead if you want to see what it would destroy without actually deleting anything). Otherwise, you can just delete the files you don't want by hand.

Release generating .pdb files, why?

Actually without PDB files and symbolic information they have it would be impossible to create a successful crash report (memory dump files) and Microsoft would not have the complete picture what caused the problem.

And so having PDB improves crash reporting.

How do I call REST API from an android app?

If you want to integrate Retrofit (all steps defined here):

Goto my blog : retrofit with kotlin

Please use android-async-http library.

the link below explains everything step by step.

http://loopj.com/android-async-http/

Here are sample apps:

Create a class :

public class HttpUtils {
  private static final String BASE_URL = "http://api.twitter.com/1/";
 
  private static AsyncHttpClient client = new AsyncHttpClient();

  public static void get(String url, RequestParams params, AsyncHttpResponseHandler responseHandler) {
      client.get(getAbsoluteUrl(url), params, responseHandler);
  }

  public static void post(String url, RequestParams params, AsyncHttpResponseHandler responseHandler) {
      client.post(getAbsoluteUrl(url), params, responseHandler);
  }
      
  public static void getByUrl(String url, RequestParams params, AsyncHttpResponseHandler responseHandler) {
      client.get(url, params, responseHandler);
  }

  public static void postByUrl(String url, RequestParams params, AsyncHttpResponseHandler responseHandler) {
      client.post(url, params, responseHandler);
  }

  private static String getAbsoluteUrl(String relativeUrl) {
      return BASE_URL + relativeUrl;
  }
}

Call Method :

    RequestParams rp = new RequestParams();
    rp.add("username", "aaa"); rp.add("password", "aaa@123");
                    
    HttpUtils.post(AppConstant.URL_FEED, rp, new JsonHttpResponseHandler() {
        @Override
        public void onSuccess(int statusCode, Header[] headers, JSONObject response) {
            // If the response is JSONObject instead of expected JSONArray
            Log.d("asd", "---------------- this is response : " + response);
            try {
                JSONObject serverResp = new JSONObject(response.toString());                                                
            } catch (JSONException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }                   
        }
            
        @Override
        public void onSuccess(int statusCode, Header[] headers, JSONArray timeline) {
            // Pull out the first event on the public timeline
                    
        }
    });

Please grant internet permission in your manifest file.

 <uses-permission android:name="android.permission.INTERNET" />

you can add compile 'com.loopj.android:android-async-http:1.4.9' for Header[] and compile 'org.json:json:20160212' for JSONObject in build.gradle file if required.

MSVCP120d.dll missing

From the comments, the problem was caused by using dlls that were built with Visual Studio 2013 in a project compiled with Visual Studio 2012. The reason for this was a third party library named the folders containing the dlls vc11, vc12. One has to be careful with any system that uses the compiler version (less than 4 digits) since this does not match the version of Visual Studio (except for Visual Studio 2010).

vc8 = Visual Studio 2005
vc9 = Visual Studio 2008
vc10 = Visual Studio 2010
vc11 = Visual Studio 2012
vc12 = Visual Studio 2013
vc14 = Visual Studio 2015
vc15 = Visual Studio 2017
vc16 = Visual Studio 2019

The Microsoft C++ runtime dlls use a 2 or 3 digit code also based on the compiler version not the version of Visual Studio.

MSVCP80.DLL is from Visual Studio 2005
MSVCP90.DLL is from Visual Studio 2008
MSVCP100.DLL is from Visual Studio 2010
MSVCP110.DLL is from Visual Studio 2012
MSVCP120.DLL is from Visual Studio 2013
MSVCP140.DLL is from Visual Studio 2015, 2017 and 2019

There is binary compatibility between Visual Studio 2015, 2017 and 2019.

<div> cannot appear as a descendant of <p>

The warning appears only because the demo code has:

function TabPanel(props) {
  const { children, value, index, ...other } = props;

  return (
    <div
      role="tabpanel"
      hidden={value !== index}
      id={`simple-tabpanel-${index}`}
      aria-labelledby={`simple-tab-${index}`}
      {...other}
    >
      {value === index && (
        <Box p={3}>  // <==NOTE P TAG HERE
          <Typography>{children}</Typography>
        </Box>
      )}
    </div>
  );
}

Changing it like this takes care of it:

function TabPanel(props) {
    const {children, value, index, classes, ...other} = props;

    return (
        <div
            role="tabpanel"
            hidden={value !== index}
            id={`simple-tabpanel-${index}`}
            aria-labelledby={`simple-tab-${index}`}
            {...other}
        >
            {value === index && (
                <Container>
                    <Box>   // <== P TAG REMOVED
                        {children}
                    </Box>
                </Container>
            )}
        </div>
    );
}

xlsxwriter: is there a way to open an existing worksheet in my workbook?

You can use the workbook.get_worksheet_by_name() feature: https://xlsxwriter.readthedocs.io/workbook.html#get_worksheet_by_name

According to https://xlsxwriter.readthedocs.io/changes.html the feature has been added on May 13, 2016.

"Release 0.8.7 - May 13 2016

-Fix for issue when inserting read-only images on Windows. Issue #352.

-Added get_worksheet_by_name() method to allow the retrieval of a worksheet from a workbook via its name.

-Fixed issue where internal file creation and modification dates were in the local timezone instead of UTC."

How do I check if a cookie exists?

There are several good answers here. I however prefer [1] not using a regular expression, and [2] using logic that is simple to read, and [3] to have a short function that [4] does not return true if the name is a substring of another cookie name . Lastly [5] we can't use a for each loop since a return doesn't break it.

function cookieExists(name) {
  var cks = document.cookie.split(';');
  for(i = 0; i < cks.length; i++)
    if (cks[i].split('=')[0].trim() == name) return true;
}

How does a Breadth-First Search work when looking for Shortest Path?

As pointed above, BFS can only be used to find shortest path in a graph if:

There are no loops
All edges have same weight or no weight.

To find the shortest path, all you have to do is start from the source and perform a breadth first search and stop when you find your destination Node. The only additional thing you need to do is have an array previous[n] which will store the previous node for every node visited. The previous of source can be null.

To print the path, simple loop through the previous[] array from source till you reach destination and print the nodes. DFS can also be used to find the shortest path in a graph under similar conditions.

However, if the graph is more complex, containing weighted edges and loops, then we need a more sophisticated version of BFS, i.e. Dijkstra's algorithm.

Function inside a function.?

It is possible to define a function from inside another function. the inner function does not exist until the outer function gets executed.

echo function_exists("y") ? 'y is defined\n' : 'y is not defined \n';
$x=x(2);
echo function_exists("y") ? 'y is defined\n' : 'y is not defined \n';

Output

y is not defined

y is defined

Simple thing you can not call function y before executed x

How to increment a number by 2 in a PHP For Loop

Another simple solution with +=:

$y = 1;

for ($x = $y; $x <= 15; $y++) {
  printf("The number of first paragraph is: $y <br>");
  printf("The number of second paragraph is: $x+=2 <br>");
}

Change size of axes title and labels in ggplot2

I think a better way to do this is to change the base_size argument. It will increase the text sizes consistently.

g + theme_grey(base_size = 22)

As seen here.

Get the full URL in PHP

This is quite easy to do with your Apache environment variables. This only works with Apache 2, which I assume you are using.

Simply use the following PHP code:

<?php
    $request_url = apache_getenv("HTTP_HOST") . apache_getenv("REQUEST_URI");
    echo $request_url;
?>

':app:lintVitalRelease' error when generating signed apk

I had this problem and solved it by adding:

lintOptions { 

    checkReleaseBuilds false

}

to my build.gradle file within the android{ } section.

JPA or JDBC, how are they different?

JDBC is a much lower-level (and older) specification than JPA. In it's bare essentials, JDBC is an API for interacting with a database using pure SQL - sending queries and retrieving results. It has no notion of objects or hierarchies. When using JDBC, it's up to you to translate a result set (essentially a row/column matrix of values from one or more database tables, returned by your SQL query) into Java objects.

Now, to understand and use JDBC it's essential that you have some understanding and working knowledge of SQL. With that also comes a required insight into what a relational database is, how you work with it and concepts such as tables, columns, keys and relationships. Unless you have at least a basic understanding of databases, SQL and data modelling you will not be able to make much use of JDBC since it's really only a thin abstraction on top of these things.

How to remove all white spaces from a given text file

Try this:

tr -d " \t" <filename

See the manpage for tr(1) for more details.

Using Intent in an Android application to show another activity

add the activity in your manifest file

<activity android:name=".OrderScreen" />

Calling a function of a module by using its name (a string)

As this question How to dynamically call methods within a class using method-name assignment to a variable [duplicate] marked as a duplicate as this one, I am posting a related answer here:

The scenario is, a method in a class want to call another method on the same class dynamically, I have added some details to original example which offers some wider scenario and clarity:

class MyClass:
    def __init__(self, i):
        self.i = i

    def get(self):
        func = getattr(MyClass, 'function{}'.format(self.i))
        func(self, 12)   # This one will work
        # self.func(12)    # But this does NOT work.


    def function1(self, p1):
        print('function1: {}'.format(p1))
        # do other stuff

    def function2(self, p1):
        print('function2: {}'.format(p1))
        # do other stuff


if __name__ == "__main__":
    class1 = MyClass(1)
    class1.get()
    class2 = MyClass(2)
    class2.get()

Output (Python 3.7.x)

function1: 12

function2: 12

TypeError: not all arguments converted during string formatting python

I encounter the error as well,

_mysql_exceptions.ProgrammingError: not all arguments converted during string formatting

But list args work well.

I use mysqlclient python lib. The lib looks like not to accept tuple args. To pass list args like ['arg1', 'arg2'] will work.

How to maximize a plt.show() window using Python

The following may work with all the backends, but I tested it only on QT:

import numpy as np
import matplotlib.pyplot as plt
import time

plt.switch_backend('QT4Agg') #default on my system
print('Backend: {}'.format(plt.get_backend()))

fig = plt.figure()
ax = fig.add_axes([0,0, 1,1])
ax.axis([0,10, 0,10])
ax.plot(5, 5, 'ro')

mng = plt._pylab_helpers.Gcf.figs.get(fig.number, None)

mng.window.showMaximized() #maximize the figure
time.sleep(3)
mng.window.showMinimized() #minimize the figure
time.sleep(3)
mng.window.showNormal() #normal figure
time.sleep(3)
mng.window.hide() #hide the figure
time.sleep(3)
fig.show() #show the previously hidden figure

ax.plot(6,6, 'bo') #just to check that everything is ok
plt.show()

Remove and Replace Printed items

import sys
import time

a = 0  
for x in range (0,3):  
    a = a + 1  
    b = ("Loading" + "." * a)
    # \r prints a carriage return first, so `b` is printed on top of the previous line.
    sys.stdout.write('\r'+b)
    time.sleep(0.5)
print (a)

Note that you might have to run sys.stdout.flush() right after sys.stdout.write('\r'+b) depending on which console you are doing the printing to have the results printed when requested without any buffering.

Asp.Net MVC with Drop Down List, and SelectListItem Assistance

You have a view model to which your view is strongly typed => use strongly typed helpers:

<%= Html.DropDownListFor(
    x => x.SelectedAccountId, 
    new SelectList(Model.Accounts, "Value", "Text")
) %>

Also notice that I use a SelectList for the second argument.

And in your controller action you were returning the view model passed as argument and not the one you constructed inside the action which had the Accounts property correctly setup so this could be problematic. I've cleaned it a bit:

public ActionResult AccountTransaction()
{
    var accounts = Services.AccountServices.GetAccounts(false);
    var viewModel = new AccountTransactionView
    {
        Accounts = accounts.Select(a => new SelectListItem
        {
            Text = a.Description,
            Value = a.AccountId.ToString()
        })
    };
    return View(viewModel);
}

How to use .htaccess in WAMP Server?

RewriteEngine on
RewriteBase /basic_test/

RewriteRule ^index.php$ test.php

How to get an enum value from a string value in Java?

Here's a nifty utility I use:

/**
 * A common method for all enums since they can't have another base class
 * @param <T> Enum type
 * @param c enum type. All enums must be all caps.
 * @param string case insensitive
 * @return corresponding enum, or null
 */
public static <T extends Enum<T>> T getEnumFromString(Class<T> c, String string) {
    if( c != null && string != null ) {
        try {
            return Enum.valueOf(c, string.trim().toUpperCase());
        } catch(IllegalArgumentException ex) {
        }
    }
    return null;
}

Then in my enum class I usually have this to save some typing:

public static MyEnum fromString(String name) {
    return getEnumFromString(MyEnum.class, name);
}

If your enums are not all caps, just change the Enum.valueOf line.

Too bad I can't use T.class for Enum.valueOf as T is erased.

UIView with rounded corners and drop shadow?

var shadows = UIView()
shadows.frame = view.frame
shadows.clipsToBounds = false
view.addSubview(shadows)


let shadowPath0 = UIBezierPath(roundedRect: shadows.bounds, cornerRadius: 10)
let layer0 = CALayer()
layer0.shadowPath = shadowPath0.cgPath
layer0.shadowColor = UIColor(red: 0, green: 0, blue: 0, alpha: 0.23).cgColor
layer0.shadowOpacity = 1
layer0.shadowRadius = 6
layer0.shadowOffset = CGSize(width: 0, height: 3)
layer0.bounds = shadows.bounds
layer0.position = shadows.center

shadows.layer.addSublayer(layer0)

Read Content from Files which are inside Zip file

Sample code you can use to let Tika take care of container files for you. http://wiki.apache.org/tika/RecursiveMetadata

Form what I can tell, the accepted solution will not work for cases where there are nested zip files. Tika, however will take care of such situations as well.

JavaScript DOM remove element

Seems I don't have enough rep to post a comment, so another answer will have to do.

When you unlink a node using removeChild() or by setting the innerHTML property on the parent, you also need to make sure that there is nothing else referencing it otherwise it won't actually be destroyed and will lead to a memory leak. There are lots of ways in which you could have taken a reference to the node before calling removeChild() and you have to make sure those references that have not gone out of scope are explicitly removed.

Doug Crockford writes here that event handlers are known a cause of circular references in IE and suggests removing them explicitly as follows before calling removeChild()

function purge(d) {
    var a = d.attributes, i, l, n;
    if (a) {
        for (i = a.length - 1; i >= 0; i -= 1) {
            n = a[i].name;
            if (typeof d[n] === 'function') {
                d[n] = null;
            }
        }
    }
    a = d.childNodes;
    if (a) {
        l = a.length;
        for (i = 0; i < l; i += 1) {
            purge(d.childNodes[i]);
        }
    }
}

And even if you take a lot of precautions you can still get memory leaks in IE as described by Jens-Ingo Farley here.

And finally, don't fall into the trap of thinking that Javascript delete is the answer. It seems to be suggested by many, but won't do the job. Here is a great reference on understanding delete by Kangax.

Force page scroll position to top at page refresh in HTML

The supercalifragilisticexpialidocious answer is:

add this at the top of your js file or script tag

document.documentElement.scrollTop = 0; // For Chrome, Firefox, IE and Opera

document.body.scrollTop = 0; // For Safari

Reverse HashMap keys and values in Java

Apache commons collections library provides a utility method for inversing the map. You can use this if you are sure that the values of myHashMap are unique

org.apache.commons.collections.MapUtils.invertMap(java.util.Map map)

Sample code

HashMap<String, Character> reversedHashMap = MapUtils.invertMap(myHashMap)

Issue with background color and Google Chrome

Google Chrome and safari needs a tweak for body and background issues. We have use additional identifier as mentioned below.

<style>
body { background:#204960 url(../images/example.gif) repeat-x top; margin:0; padding:0; font-family:Tahoma; font-size:12px; }

#body{ background:#204960 url(../images/example.gif) repeat-x top; margin:0; padding:0; font-family:Tahoma; font-size:12px;}
</style>    
<body id="body">

Use both body and #body identifier and enter same styles in both. Make the body tag with id attribute of body.

This works for me.

How to achieve ripple animation using support library?

I formerly voted to close this question as off-topic but actually I changed my mind as this is quite nice visual effect which, unfortunately, is not yet part of support library. It will most likely show up in future update, but there's no time frame announced.

Luckily there are few custom implementations already available:

including Materlial themed widget sets compatible with older versions of Android:

https://github.com/keithellis/MaterialWidget

so you can try one of these or google for other "material widgets" or so...

Don't change link color when a link is clicked

You need to use an explicit color value (e.g. #000 or blue) for the color-property. none is invalid here. The initial value is browser-specific and cannot be restored using CSS. Keep in mind that there are some other pseudo-classes than :active, too.

Where Sticky Notes are saved in Windows 10 1607

It worked for me when HDD with win8.1 crashed and my new HDD has win10. Important to know - Create Legacy folder mentioned in this link. - Remember to rename the StickyNotes.snt to ThresholdNotes.snt. - Restart the app

Find details here https://www.reddit.com/r/Windows10/comments/4wxfds/transfermigrate_sticky_notes_to_new_anniversary/

Change size of text in text input tag?

To change the font size of the <input /> tag in HTML, use this:

<input style="font-size:20px" type="text" value="" />

It will create a text input box and the text inside the text box will be 20 pixels.

Find Item in ObservableCollection without using a loop

Here comes Linq:

var listItem = list.Single(i => i.Title == title);

It throws an exception if there's no item matching the predicate. Alternatively, there's SingleOrDefault.

If you want a collection of items matching the title, there's:

var listItems = list.Where(i => i.Title ==  title);

How to deploy a React App on Apache web server

You can run it through the Apache proxy, but it would have to be running in a virtual directory (e.g. http://mysite.something/myreactapp ).

This may seem sort of redundant but if you have other pages that are not part of your React app (e.g. PHP pages), you can serve everything via port 80 and make it apear that the whole thing is a cohesive website.

1.) Start your react app with npm run, or whatever command you are using to start the node server. Assuming it is running on http://127.0.0.1:8080

2.) Edit httpd-proxy.conf and add:

ProxyRequests On
ProxyVia On
<Proxy *>
  Order deny,allow
  Allow from all
  </Proxy>

ProxyPass /myreactapp http://127.0.0.1:8080/
ProxyPassReverse /myreactapp  http://127.0.0.1:8080/

3.) Restart Apache

Bash if statement with multiple conditions throws an error

You can get some inspiration by reading an entrypoint.sh script written by the contributors from MySQL that checks whether the specified variables were set.

As the script shows, you can pipe them with -a, e.g.:

if [ -z "$MYSQL_ROOT_PASSWORD" -a -z "$MYSQL_ALLOW_EMPTY_PASSWORD" -a -z "$MYSQL_RANDOM_ROOT_PASSWORD" ]; then
    ...
fi

SQL exclude a column using SELECT * [except columnA] FROM tableA?

No.

Maintenance-light best practice is to specify only the required columns.

At least 2 reasons:

This makes your contract between client and database stable. Same data, every time
Performance, covering indexes

Edit (July 2011):

If you drag from Object Explorer the Columns node for a table, it puts a CSV list of columns in the Query Window for you which achieves one of your goals

log4j:WARN No appenders could be found for logger (running jar file, not web app)

Man, I had the issue in one of my eclipse projects, amazingly the issue was the order of the jars in my .project file. believe it or not!

How can I prevent the TypeError: list indices must be integers, not tuple when copying a python list to a numpy array?

You probably do not need to be making lists and appending them to make your array. You can likely just do it all at once, which is faster since you can use numpy to do your loops instead of doing them yourself in pure python.

To answer your question, as others have said, you cannot access a nested list with two indices like you did. You can if you convert mean_data to an array before not after you try to slice it:

R = np.array(mean_data)[:,0]

instead of

R = np.array(mean_data[:,0])

But, assuming mean_data has a shape nx3, instead of

R = np.array(mean_data)[:,0]
P = np.array(mean_data)[:,1]
Z = np.array(mean_data)[:,2]

You can simply do

A = np.array(mean_data).mean(axis=0)

which averages over the 0th axis and returns a length-n array

But to my original point, I will make up some data to try to illustrate how you can do this without building any lists one item at a time:

How to specify the download location with wget?

Make sure you have the URL correct for whatever you are downloading. First of all, URLs with characters like ? and such cannot be parsed and resolved. This will confuse the cmd line and accept any characters that aren't resolved into the source URL name as the file name you are downloading into.

For example:

wget "sourceforge.net/projects/ebosse/files/latest/download?source=typ_redirect"

will download into a file named, ?source=typ_redirect.

As you can see, knowing a thing or two about URLs helps to understand wget.

I am booting from a hirens disk and only had Linux 2.6.1 as a resource (import os is unavailable). The correct syntax that solved my problem downloading an ISO onto the physical hard drive was:

wget "(source url)" -O (directory where HD was mounted)/isofile.iso"

One could figure the correct URL by finding at what point wget downloads into a file named index.html (the default file), and has the correct size/other attributes of the file you need shown by the following command:

wget "(source url)"

Once that URL and source file is correct and it is downloading into index.html, you can stop the download (ctrl + z) and change the output file by using:

-O "<specified download directory>/filename.extension"

after the source url.

In my case this results in downloading an ISO and storing it as a binary file under isofile.iso, which hopefully mounts.

Launch custom android application from android browser

You need to add a pseudo-hostname to the CALLBACK_URL 'app://' doesn't make sense as a URL and cannot be parsed.

Checking if a folder exists using a .bat file

I think the answer is here (possibly duplicate):

How to test if a file is a directory in a batch script?

IF EXIST %VAR%\NUL ECHO It's a directory

Replace %VAR% with your directory. Please read the original answer because includes details about handling white spaces in the folder name.

As foxidrive said, this might not be reliable on NT class windows. It works for me, but I know it has some limitations (which you can find in the referenced question)

if exist "c:\folder\" echo folder exists

should be enough for modern windows.

Interface vs Base class

Previous comments about using abstract classes for common implementation is definitely on the mark. One benefit I haven't seen mentioned yet is that the use of interfaces makes it much easier to implement mock objects for the purpose of unit testing. Defining IPet and PetBase as Jason Cohen described enables you to mock different data conditions easily, without the overhead of a physical database (until you decide it's time to test the real thing).

What's the difference between import java.util.*; and import java.util.Date; ?

import java.util.*;

imports everything within java.util including the Date class.

import java.util.Date;

just imports the Date class.

Doing either of these could not make any difference.

@HostBinding and @HostListener: what do they do and what are they for?

Another nice thing about @HostBinding is that you can combine it with @Input if your binding relies directly on an input, eg:

@HostBinding('class.fixed-thing')
@Input()
fixed: boolean;

How to implement the Android ActionBar back button?

In the OnCreate method add this:

if (getSupportActionBar() != null)
    {
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
    }

Then add this method:

@Override
public boolean onSupportNavigateUp() {
    onBackPressed();
    return true;
}

How to get the data-id attribute?

I use $.data - http://api.jquery.com/jquery.data/

//Set value 7 to data-id 
$.data(this, 'id', 7);

//Get value from data-id
alert( $(this).data("id") ); // => outputs 7

Check if event exists on element

I wrote a plugin called hasEventListener which exactly does that.

Hope this helps.

Using await outside of an async function

you can do top level await since typescript 3.8
https://www.typescriptlang.org/docs/handbook/release-notes/typescript-3-8.html#-top-level-await
From the post:
This is because previously in JavaScript (along with most other languages with a similar feature), await was only allowed within the body of an async function. However, with top-level await, we can use await at the top level of a module.

const response = await fetch("...");
const greeting = await response.text();
console.log(greeting);

// Make sure we're a module
export {};

Note there’s a subtlety: top-level await only works at the top level of a module, and files are only considered modules when TypeScript finds an import or an export. In some basic cases, you might need to write out export {} as some boilerplate to make sure of this.

Top level await may not work in all environments where you might expect at this point. Currently, you can only use top level await when the target compiler option is es2017 or above, and module is esnext or system. Support within several environments and bundlers may be limited or may require enabling experimental support.

How can I pass a list as a command-line argument with argparse?

Additionally to nargs, you might want to use choices if you know the list in advance:

>>> parser = argparse.ArgumentParser(prog='game.py')
>>> parser.add_argument('move', choices=['rock', 'paper', 'scissors'])
>>> parser.parse_args(['rock'])
Namespace(move='rock')
>>> parser.parse_args(['fire'])
usage: game.py [-h] {rock,paper,scissors}
game.py: error: argument move: invalid choice: 'fire' (choose from 'rock',
'paper', 'scissors')

git checkout tag, git pull fails in branch

First, make sure you are on the right branch.
Then (one time only):

git branch --track

After that this works again:

git pull

How do I write a correct micro-benchmark in Java?

Important things for Java benchmarks are:

Warm up the JIT first by running the code several times before timing it
Make sure you run it for long enough to be able to measure the results in seconds or (better) tens of seconds
While you can't call System.gc() between iterations, it's a good idea to run it between tests, so that each test will hopefully get a "clean" memory space to work with. (Yes, gc() is more of a hint than a guarantee, but it's very likely that it really will garbage collect in my experience.)
I like to display iterations and time, and a score of time/iteration which can be scaled such that the "best" algorithm gets a score of 1.0 and others are scored in a relative fashion. This means you can run all algorithms for a longish time, varying both number of iterations and time, but still getting comparable results.

I'm just in the process of blogging about the design of a benchmarking framework in .NET. I've got a couple of earlier posts which may be able to give you some ideas - not everything will be appropriate, of course, but some of it may be.

iOS 11, 12, and 13 installed certificates not trusted automatically (self signed)

Apple hand three categories of certificates: Trusted, Always Ask and Blocked. You'll encounter the issue if your certificate's type on the Blocked and Always Ask list. On Safari it show’s like:

And you can find the type of Always Ask certificates on Settings > General > About > Certificate Trust Setting

There is the List of available trusted root certificates in iOS 11

Blocking Trust for WoSign CA Free SSL Certificate G2

Error "gnu/stubs-32.h: No such file or directory" while compiling Nachos source code

From the GNU UPC website:

Compiler build fails with fatal error: gnu/stubs-32.h: No such file or directory

This error message shows up on the 64 bit systems where GCC/UPC multilib feature is enabled, and it indicates that 32 bit version of libc is not installed. There are two ways to correct this problem:

Install 32 bit version of glibc (e.g. glibc-devel.i686 on Fedora, CentOS, ..)

Disable 'multilib' build by supplying "--disable-multilib" switch on the compiler configuration command

How do you perform a left outer join using linq extension methods

You can create extension method like:

public static IEnumerable<TResult> LeftOuterJoin<TSource, TInner, TKey, TResult>(this IEnumerable<TSource> source, IEnumerable<TInner> other, Func<TSource, TKey> func, Func<TInner, TKey> innerkey, Func<TSource, TInner, TResult> res)
    {
        return from f in source
               join b in other on func.Invoke(f) equals innerkey.Invoke(b) into g
               from result in g.DefaultIfEmpty()
               select res.Invoke(f, result);
    }

Can't compile project when I'm using Lombok under IntelliJ IDEA

How do I install ASP.NET MVC 5 in Visual Studio 2012?

You should be able to install from NuGet (http://www.nuget.org/packages/Microsoft.AspNet.Mvc) into VS2012. Change the Target Framework to .NET 4.5.

Not sure the new project templates are ready for VS2012. But if you have an ASP.NET MVC 4 app you can upgrade using the link below.

http://www.asp.net/mvc/tutorials/mvc-5/how-to-upgrade-an-aspnet-mvc-4-and-web-api-project-to-aspnet-mvc-5-and-web-api-2

JavaScript alert box with timer

If you want an alert to appear after a certain about time, you can use this code:

setTimeout(function() { alert("my message"); }, time);

If you want an alert to appear and disappear after a specified interval has passed, then you're out of luck. When an alert has fired, the browser stops processing the javascript code until the user clicks "ok". This happens again when a confirm or prompt is shown.

If you want the appear/disappear behavior, then I would recommend using something like jQueryUI's dialog widget. Here's a quick example on how you might use it to achieve that behavior.

var dialog = $(foo).dialog('open');
setTimeout(function() { dialog.dialog('close'); }, time);

iOS: UIButton resize according to text length

Swift 4.2

Thank god, this solved. After setting a text to the button, you can retrieve intrinsicContentSize which is the natural size from an UIView (the official document is here). For UIButton, you can use it like below.

button.intrinsicContentSize.width

For your information, I adjusted the width to make it look properly.

button.frame = CGRect(fx: xOffset, y: 0.0, width: button.intrinsicContentSize.width + 18, height: 40)

Simulator

UIButtons with intrinsicContentSize

Source: https://riptutorial.com/ios/example/16418/get-uibutton-s-size-strictly-based-on-its-text-and-font

Error while inserting date - Incorrect date value:

As MySql accepts the date in y-m-d format in date type column, you need to STR_TO_DATE function to convert the date into yyyy-mm-dd format for insertion in following way:

INSERT INTO table_name(today) 
VALUES(STR_TO_DATE('07-25-2012','%m-%d-%y'));

Similary, if you want to select the date in different format other than Mysql format, you should try DATE_FORMAT function

SELECT DATE_FORMAT(today, '%m-%d-%y') from table_name;

How to setup Main class in manifest file in jar produced by NetBeans project

It is simple.

Right click on the project
Go to Properties
Go to Run in Categories tree
Set the Main Class in the right side panel.
Build the project

Thats it. Hope this helps.

How to insert data into SQL Server

string saveStaff = "INSERT into student (stud_id,stud_name) " + " VALUES ('" + SI+ "', '" + SN + "');";
cmd = new SqlCommand(saveStaff,con);
cmd.ExecuteNonQuery();

GCC -fPIC option

Position Independent Code means that the generated machine code is not dependent on being located at a specific address in order to work.

E.g. jumps would be generated as relative rather than absolute.

Pseudo-assembly:

PIC: This would work whether the code was at address 100 or 1000

100: COMPARE REG1, REG2
101: JUMP_IF_EQUAL CURRENT+10
...
111: NOP

Non-PIC: This will only work if the code is at address 100

100: COMPARE REG1, REG2
101: JUMP_IF_EQUAL 111
...
111: NOP

EDIT: In response to comment.

If your code is compiled with -fPIC, it's suitable for inclusion in a library - the library must be able to be relocated from its preferred location in memory to another address, there could be another already loaded library at the address your library prefers.

Convert JsonObject to String

Add a double quotes outside the brackets and replace double quotes inside the {} with \"

So: "{\"data\":{..... }"

.htaccess rewrite subdomain to directory

For any sub domain request, use this:

RewriteEngine on 
RewriteCond %{HTTP_HOST} !^www\.band\.s\.co 
RewriteCond %{HTTP_HOST} ^(.*)\.band\.s\.co 
RewriteCond %{REQUEST_URI} !^/([a-zA-Z0-9-z\-]+) 
RewriteRule ^(.*)$ /%1/$1 [L]

Just make some folder same as sub domain name you need. Folder must be exist like this: domain.com/sub for sub.domain.com.

What does -Xmn jvm option stands for

From here:

-Xmn : the size of the heap for the young generation

Young generation represents all the objects which have a short life of time. Young generation objects are in a specific location into the heap, where the garbage collector will pass often. All new objects are created into the young generation region (called "eden"). When an object survive is still "alive" after more than 2-3 gc cleaning, then it will be swap has an "old generation" : they are "survivor".

And a more "official" source from IBM:

-Xmn

Sets the initial and maximum size of the new (nursery) heap to the specified value when using -Xgcpolicy:gencon. Equivalent to setting both -Xmns and -Xmnx. If you set either -Xmns or -Xmnx, you cannot set -Xmn. If you attempt to set -Xmn with either -Xmns or -Xmnx, the VM will not start, returning an error. By default, -Xmn is selected internally according to your system's capability. You can use the -verbose:sizes option to find out the values that the VM is currently using.

Programs & Examples On #Information visualization

Plot correlation matrix using pandas

Getting datarow values into a string?

Linux command to print directory structure in the form of a tree

How to find all serial devices (ttyS, ttyUSB, ..) on Linux without opening them?

What does "dereferencing" a pointer mean?

How to scale an Image in ImageView to keep the aspect ratio

Python date string to date object

How to do a batch insert in MySQL

Does IMDB provide an API?

File path to resource in our war/WEB-INF folder?

What is the best way to test for an empty string with jquery-out-of-the-box?

Selenium WebDriver and DropDown Boxes

How to fix broken paste clipboard in VNC on Windows

Oracle 'Partition By' and 'Row_Number' keyword

fcntl substitute on Windows

How to squash commits in git after they have been pushed?

How can I show/hide a specific alert with twitter bootstrap?

jQuery post() with serialize and extra data

Generate a UUID on iOS from Swift

Double Iteration in List Comprehension

Fixing the order of facets in ggplot

Are HTTP headers case-sensitive?

Delete element in a slice

WebSocket with SSL

how to get the attribute value of an xml node using java

How to write an async method with out parameter?

Approach 1 - output a structure

Approach 2 - pass in callback methods

Approach 3 - use ContinueWith

How to put a new line into a wpf TextBlock control?

Check if string contains \n Java

URL encoding in Android

How to make an installer for my C# application?

Expansion of variables inside single quotes in a command in Bash

./xx.py: line 1: import: command not found

What resources are shared between threads?

Where can I view Tomcat log files in Eclipse?

What does functools.wraps do?

Simple way to encode a string according to a password?

How to get names of enum entries?

jQuery move to anchor location on page load

Multiple parameters in a List. How to create without a class?

Go back button in a page

is there a 'block until condition becomes true' function in java?

HTML Input Type Date, Open Calendar by default

What is the difference between Multiple R-squared and Adjusted R-squared in a single-variate least squares regression?

How to make a SIMPLE C++ Makefile

Is there a way to call a stored procedure with Dapper?

Importing class from another file

What is the connection string for localdb for version 11

Read/write to file using jQuery

How to add new column to an dataframe (to the front not end)?

How to change UINavigationBar background color from the AppDelegate

Xcode Project vs. Xcode Workspace - Differences

Get domain name from given url

How to display databases in Oracle 11g using SQL*Plus

How do I make an attributed string using Swift?

How to make the overflow CSS property work with hidden as value

Struct memory layout in C

Sort CSV file by column priority using the "sort" command

Hibernate: How to fix "identifier of an instance altered from X to Y"?

MVC [HttpPost/HttpGet] for Action

VBA general way for pulling data out of SAP

Example Code

Script Recording

Edit: Early and Late binding

Detect whether Excel workbook is already open

Dump a mysql database to a plaintext (CSV) backup from the command line

Detecting arrow key presses in JavaScript

event.key === "ArrowRight"...

"w", "a", "s", "d" for direction, use event.code

How to change Format of a Cell to Text using VBA

Selenium: Can I set any of the attribute value of a WebElement in Selenium?

How to find the socket buffer size of linux

Initializing IEnumerable<string> In C#

ajax jquery simple get request

OpenCV C++/Obj-C: Detecting a sheet of paper / Square Detection

Uninstall Django completely

how to call url of any other website in php

`"w", "a", "s", "d"` for direction, use `event.code`