You likely forgot to #include <stdlib.h>
Instead of using
int * p;
p = {1,2,3};
we can use
int * p;
p =(int[3]){1,2,3};
I think a 2 step approach is best, because c 2-d arrays are just and array of arrays. The first step is to allocate a single array, then loop through it allocating arrays for each column as you go. This article gives good detail.
Simple answer : free(testPerson)
is enough .
Remember you can use free()
only when you have allocated memory using malloc
, calloc
or realloc
.
In your case you have only malloced memory for testPerson
so freeing that is sufficient.
If you have used char * firstname , *last surName
then in that case to store name you must have allocated the memory and that's why you had to free each member individually.
Here is also a point it should be in the reverse order; that means, the memory allocated for elements is done later so free()
it first then free the pointer to object.
Freeing each element you can see the demo shown below:
typedef struct Person
{
char * firstname , *last surName;
}Person;
Person *ptrobj =malloc(sizeof(Person)); // memory allocation for struct
ptrobj->firstname = malloc(n); // memory allocation for firstname
ptrobj->surName = malloc(m); // memory allocation for surName
.
. // do whatever you want
free(ptrobj->surName);
free(ptrobj->firstname);
free(ptrobj);
The reason behind this is, if you free the ptrobj
first, then there will be memory leaked which is the memory allocated by firstname
and suName
pointers.
Difference 1:
malloc()
usually allocates the memory block and it is initialized memory segment.
calloc()
allocates the memory block and initialize all the memory block to 0.
Difference 2:
If you consider malloc()
syntax, it will take only 1 argument. Consider the following example below:
data_type ptr = (cast_type *)malloc( sizeof(data_type)*no_of_blocks );
Ex: If you want to allocate 10 block of memory for int type,
int *ptr = (int *) malloc(sizeof(int) * 10 );
If you consider calloc()
syntax, it will take 2 arguments. Consider the following example below:
data_type ptr = (cast_type *)calloc(no_of_blocks, (sizeof(data_type)));
Ex: if you want to allocate 10 blocks of memory for int type and Initialize all that to ZERO,
int *ptr = (int *) calloc(10, (sizeof(int)));
Similarity:
Both malloc()
and calloc()
will return void* by default if they are not type casted .!
You actually can't manually "free" memory in C, in the sense that the memory is released from the process back to the OS ... when you call malloc()
, the underlying libc-runtime will request from the OS a memory region. On Linux, this may be done though a relatively "heavy" call like mmap()
. Once this memory region is mapped to your program, there is a linked-list setup called the "free store" that manages this allocated memory region. When you call malloc()
, it quickly looks though the free-store for a free block of memory at the size requested. It then adjusts the linked list to reflect that there has been a chunk of memory taken out of the originally allocated memory pool. When you call free()
the memory block is placed back in the free-store as a linked-list node that indicates its an available chunk of memory.
If you request more memory than what is located in the free-store, the libc-runtime will again request more memory from the OS up to the limit of the OS's ability to allocate memory for running processes. When you free memory though, it's not returned back to the OS ... it's typically recycled back into the free-store where it can be used again by another call to malloc()
. Thus, if you make a lot of calls to malloc()
and free()
with varying memory size requests, it could, in theory, cause a condition called "memory fragmentation", where there is enough space in the free-store to allocate your requested memory block, but not enough contiguous space for the size of the block you've requested. Thus the call to malloc()
fails, and you're effectively "out-of-memory" even though there may be plenty of memory available as a total amount of bytes in the free-store.
Presumably you mean heap from a memory allocation point of view, not from a data structure point of view (the term has multiple meanings).
A very simple explanation is that the heap is the portion of memory where dynamically allocated memory resides (i.e. memory allocated via malloc
). Memory allocated from the heap will remain allocated until one of the following occurs:
free
'dIf all references to allocated memory are lost (e.g. you don't store a pointer to it anymore), you have what is called a memory leak. This is where the memory has still been allocated, but you have no easy way of accessing it anymore. Leaked memory cannot be reclaimed for future memory allocations, but when the program ends the memory will be free'd up by the operating system.
Contrast this with stack memory which is where local variables (those defined within a method) live. Memory allocated on the stack generally only lives until the function returns (there are some exceptions to this, e.g. static local variables).
You can find more information about the heap in this article.
array
is a slightly misleading name. For a dynamically allocated array of pointers, malloc
will return a pointer to a block of memory. You need to use Chess*
and not Chess[]
to hold the pointer to your array.
Chess *array = malloc(size * sizeof(Chess));
array[i] = NULL;
and perhaps later:
/* create new struct chess */
array[i] = malloc(sizeof(struct chess));
/* set up its members */
array[i]->size = 0;
/* etc. */
In my opinion, alloca(), where available, should be used only in a constrained manner. Very much like the use of "goto", quite a large number of otherwise reasonable people have strong aversion not just to the use of, but also the existence of, alloca().
For embedded use, where the stack size is known and limits can be imposed via convention and analysis on the size of the allocation, and where the compiler cannot be upgraded to support C99+, use of alloca() is fine, and I've been known to use it.
When available, VLAs may have some advantages over alloca(): The compiler can generate stack limit checks that will catch out-of-bounds access when array style access is used (I don't know if any compilers do this, but it can be done), and analysis of the code can determine whether the array access expressions are properly bounded. Note that, in some programming environments, such as automotive, medical equipment, and avionics, this analysis has to be done even for fixed size arrays, both automatic (on the stack) and static allocation (global or local).
On architectures that store both data and return addresses/frame pointers on the stack (from what I know, that's all of them), any stack allocated variable can be dangerous because the address of the variable can be taken, and unchecked input values might permit all sorts of mischief.
Portability is less of a concern in the embedded space, however it is a good argument against use of alloca() outside of carefully controlled circumstances.
Outside of the embedded space, I've used alloca() mostly inside logging and formatting functions for efficiency, and in a non-recursive lexical scanner, where temporary structures (allocated using alloca() are created during tokenization and classification, then a persistent object (allocated via malloc()) is populated before the function returns. The use of alloca() for the smaller temporary structures greatly reduces fragmentation when the persistent object is allocated.
The sbrk
system call moves the "border" of the data segment. This means it moves a border of an area in which a program may read/write data (letting it grow or shrink, although AFAIK no malloc
really gives memory segments back to the kernel with that method). Aside from that, there's also mmap
which is used to map files into memory but is also used to allocate memory (if you need to allocate shared memory, mmap
is how you do it).
So you have two methods of getting more memory from the kernel: sbrk
and mmap
. There are various strategies on how to organize the memory that you've got from the kernel.
One naive way is to partition it into zones, often called "buckets", which are dedicated to certain structure sizes. For example, a malloc
implementation could create buckets for 16, 64, 256 and 1024 byte structures. If you ask malloc
to give you memory of a given size it rounds that number up to the next bucket size and then gives you an element from that bucket. If you need a bigger area malloc
could use mmap
to allocate directly with the kernel. If the bucket of a certain size is empty malloc
could use sbrk
to get more space for a new bucket.
There are various malloc
designs and there is propably no one true way of implementing malloc
as you need to make a compromise between speed, overhead and avoiding fragmentation/space effectiveness. For example, if a bucket runs out of elements an implementation might get an element from a bigger bucket, split it up and add it to the bucket that ran out of elements. This would be quite space efficient but would not be possible with every design. If you just get another bucket via sbrk
/mmap
that might be faster and even easier, but not as space efficient. Also, the design must of course take into account that "free" needs to make space available to malloc
again somehow. You don't just hand out memory without reusing it.
If you're interested, the OpenSER/Kamailio SIP proxy has two malloc
implementations (they need their own because they make heavy use of shared memory and the system malloc
doesn't support shared memory). See: https://github.com/OpenSIPS/opensips/tree/master/mem
Then you could also have a look at the GNU libc malloc
implementation, but that one is very complicated, IIRC.
#define ID_LEN 5
char **orderedIds;
int i;
int variableNumberOfElements = 5; /* Hard coded here */
orderedIds = (char **)malloc(variableNumberOfElements * (ID_LEN + 1) * sizeof(char));
..
As other stated, it is not needed for C, but for C++.
Including the cast may allow a C program or function to compile as C++.
In C it is unnecessary, as void * is automatically and safely promoted to any other pointer type.
But if you cast then, it can hide an error if you forgot to include stdlib.h. This can cause crashes (or, worse, not cause a crash until way later in some totally different part of the code).
Because stdlib.h contains the prototype for malloc is found. In the absence of a prototype for malloc, the standard requires that the C compiler assumes malloc returns an int. If there is no cast, a warning is issued when this integer is assigned to the pointer; however, with the cast, this warning is not produced, hiding a bug.
malloc for single chars or integers and calloc for dynamic arrays. ie pointer = ((int *)malloc(sizeof(int)) == NULL)
, you can do arithmetic within the brackets of malloc
but you shouldnt because you should use calloc
which has the definition of void calloc(count, size)
which means how many items you want to store ie count and size of data ie int
, char
etc.
realloc is a pretty expensive action... here's my way of receiving a string, the realloc ratio is not 1:1 :
char* getAString()
{
//define two indexes, one for logical size, other for physical
int logSize = 0, phySize = 1;
char *res, c;
res = (char *)malloc(sizeof(char));
//get a char from user, first time outside the loop
c = getchar();
//define the condition to stop receiving data
while(c != '\n')
{
if(logSize == phySize)
{
phySize *= 2;
res = (char *)realloc(res, sizeof(char) * phySize);
}
res[logSize++] = c;
c = getchar();
}
//here we diminish string to actual logical size, plus one for \0
res = (char *)realloc(res, sizeof(char *) * (logSize + 1));
res[logSize] = '\0';
return res;
}
Dynamic allocation is only required when the life-time of the object should be different than the scope it gets created in (This holds as well for making the scope smaller as larger) and you have a specific reason where storing it by value doesn't work.
For example:
std::vector<int> *createVector(); // Bad
std::vector<int> createVector(); // Good
auto v = new std::vector<int>(); // Bad
auto result = calculate(/*optional output = */ v);
auto v = std::vector<int>(); // Good
auto result = calculate(/*optional output = */ &v);
From C++11 on, we have std::unique_ptr
for dealing with allocated memory, which contains the ownership of the allocated memory. std::shared_ptr
was created for when you have to share ownership. (you'll need this less than you would expect in a good program)
Creating an instance becomes really easy:
auto instance = std::make_unique<Class>(/*args*/); // C++14
auto instance = std::make_unique<Class>(new Class(/*args*/)); // C++11
auto instance = std::make_unique<Class[]>(42); // C++14
auto instance = std::make_unique<Class[]>(new Class[](42)); // C++11
C++17 also adds std::optional
which can prevent you from requiring memory allocations
auto optInstance = std::optional<Class>{};
if (condition)
optInstance = Class{};
As soon as 'instance' goes out of scope, the memory gets cleaned up. Transferring ownership is also easy:
auto vector = std::vector<std::unique_ptr<Interface>>{};
auto instance = std::make_unique<Class>();
vector.push_back(std::move(instance)); // std::move -> transfer (most of the time)
So when do you still need new
? Almost never from C++11 on. Most of the you use std::make_unique
until you get to a point where you hit an API that transfers ownership via raw pointers.
auto instance = std::make_unique<Class>();
legacyFunction(instance.release()); // Ownership being transferred
auto instance = std::unique_ptr<Class>{legacyFunction()}; // Ownership being captured in unique_ptr
In C++98/03, you have to do manual memory management. If you are in this case, try upgrading to a more recent version of the standard. If you are stuck:
auto instance = new Class(); // Allocate memory
delete instance; // Deallocate
auto instances = new Class[42](); // Allocate memory
delete[] instances; // Deallocate
Make sure that you track the ownership correctly to not have any memory leaks! Move semantics don't work yet either.
So, when do we need malloc in C++? The only valid reason would be to allocate memory and initialize it later via placement new.
auto instanceBlob = std::malloc(sizeof(Class)); // Allocate memory
auto instance = new(instanceBlob)Class{}; // Initialize via constructor
instance.~Class(); // Destroy via destructor
std::free(instanceBlob); // Deallocate the memory
Even though, the above is valid, this can be done via a new-operator as well. std::vector
is a good example for this.
Finally, we still have the elephant in the room: C
. If you have to work with a C-library where memory gets allocated in the C++ code and freed in the C code (or the other way around), you are forced to use malloc/free.
If you are in this case, forget about virtual functions, member functions, classes ... Only structs with PODs in it are allowed.
Some exceptions to the rules:
This has nothing specifically to do with malloc and free. Your program exhibits undefined behaviour after you copy the string - it could crash at that point or at any point afterwards. This would be true even if you never used malloc and free, and allocated the char array on the stack or statically.
99.9% likely that you have corrupted memory (over- or under-flowed a buffer, wrote to a pointer after it was freed, called free twice on the same pointer, etc.)
Run your code under Valgrind to see where your program did something incorrect.
What's the real result here?
Your program leaked the memory. Depending on your OS, it may have been recovered.
Most modern desktop operating systems do recover leaked memory at process termination, making it sadly common to ignore the problem, as can be seen by many other answers here.)
But you are relying on a safety feature you should not rely upon, and your program (or function) might run on a system where this behaviour does result in a "hard" memory leak, next time.
You might be running in kernel mode, or on vintage / embedded operating systems which do not employ memory protection as a tradeoff. (MMUs take up die space, memory protection costs additional CPU cycles, and it is not too much to ask from a programmer to clean up after himself).
You can use and re-use memory any way you like, but make sure you deallocated all resources before exiting.
As far as I can tell there is no upper limit in 2008.
In SQL Server 2005 the code in your question fails on the assignment to the @GGMMsg
variable with
Attempting to grow LOB beyond maximum allowed size of 2,147,483,647 bytes.
the code below fails with
REPLICATE: The length of the result exceeds the length limit (2GB) of the target large type.
However it appears these limitations have quietly been lifted. On 2008
DECLARE @y VARCHAR(MAX) = REPLICATE(CAST('X' AS VARCHAR(MAX)),92681);
SET @y = REPLICATE(@y,92681);
SELECT LEN(@y)
Returns
8589767761
I ran this on my 32 bit desktop machine so this 8GB string is way in excess of addressable memory
Running
select internal_objects_alloc_page_count
from sys.dm_db_task_space_usage
WHERE session_id = @@spid
Returned
internal_objects_alloc_page_co
------------------------------
2144456
so I presume this all just gets stored in LOB
pages in tempdb
with no validation on length. The page count growth was all associated with the SET @y = REPLICATE(@y,92681);
statement. The initial variable assignment to @y
and the LEN
calculation did not increase this.
The reason for mentioning this is because the page count is hugely more than I was expecting. Assuming an 8KB page then this works out at 16.36 GB which is obviously more or less double what would seem to be necessary. I speculate that this is likely due to the inefficiency of the string concatenation operation needing to copy the entire huge string and append a chunk on to the end rather than being able to add to the end of the existing string. Unfortunately at the moment the .WRITE
method isn't supported for varchar(max) variables.
Addition
I've also tested the behaviour with concatenating nvarchar(max) + nvarchar(max)
and nvarchar(max) + varchar(max)
. Both of these allow the 2GB limit to be exceeded. Trying to then store the results of this in a table then fails however with the error message Attempting to grow LOB beyond maximum allowed size of 2147483647 bytes.
again. The script for that is below (may take a long time to run).
DECLARE @y1 VARCHAR(MAX) = REPLICATE(CAST('X' AS VARCHAR(MAX)),2147483647);
SET @y1 = @y1 + @y1;
SELECT LEN(@y1), DATALENGTH(@y1) /*4294967294, 4294967292*/
DECLARE @y2 NVARCHAR(MAX) = REPLICATE(CAST('X' AS NVARCHAR(MAX)),1073741823);
SET @y2 = @y2 + @y2;
SELECT LEN(@y2), DATALENGTH(@y2) /*2147483646, 4294967292*/
DECLARE @y3 NVARCHAR(MAX) = @y2 + @y1
SELECT LEN(@y3), DATALENGTH(@y3) /*6442450940, 12884901880*/
/*This attempt fails*/
SELECT @y1 y1, @y2 y2, @y3 y3
INTO Test
Excel can display a Date type in a similar manner to a DateTime. Right click on the affected cell, select Format Cells, then under Category select Date and under Type select the type that looks something like this:
3/14/01 1:30 PM
That should do what you requested. I tested sorting on some sample data with this format and it seemed to work fine.
I agree with the other answers that using two containers is preferable, but if you have your heart set on bunding multiple services in a single container you can use something like supervisord.
in Hipache for instance, the included Dockerfile runs supervisord, and the file supervisord.conf specifies for both hipache and redis-server to be run.
Did you set the CSS:
html, body
{
height: 100%;
}
You need this to be able to make the div take up all the space. :)
function GetURLParameter(parameter) {
var url;
var search;
var parsed;
var count;
var loop;
var searchPhrase;
url = window.location.href;
search = url.indexOf("?");
if (search < 0) {
return "";
}
searchPhrase = parameter + "=";
parsed = url.substr(search+1).split("&");
count = parsed.length;
for(loop=0;loop<count;loop++) {
if (parsed[loop].substr(0,searchPhrase.length)==searchPhrase) {
return decodeURI(parsed[loop].substr(searchPhrase.length));
}
}
return "";
}
There is, indeed, prevision for such feature, look http://www.w3.org/TR/css3-values/#attr-notation
This fiddle should work like what you need, but will not for now.
Unfortunately, it's still a draft, and isn't fully implemented on major browsers.
It does work for content
on pseudo-elements, though.
You can use Task
like this :
public int SelectedTab
{
get => selected_tab;
set
{
selected_tab = value;
new Task(async () =>
{
await newTab.ScaleTo(0.8);
}).Start();
}
}
you can also use
.detail_container h1:nth-of-type(1)
By changing the number 1 by any other number you can select any other h1 item.
Old question but nowadays CSS3 makes vertical alignment really simple!
Just add to #abc
the following css:
display:flex;
align-items:center;
Original question demo updated
Simple Example:
.vertical-align-content {_x000D_
background-color:#f18c16;_x000D_
height:150px;_x000D_
display:flex;_x000D_
align-items:center;_x000D_
/* Uncomment next line to get horizontal align also */_x000D_
/* justify-content:center; */_x000D_
}
_x000D_
<div class="vertical-align-content">_x000D_
Hodor!_x000D_
</div>
_x000D_
A simple way is to check the version by typing psql --version
in terminal
Hi not an expert in streaming but my understanding is that it is included in th Java Media Framework JMF http://java.sun.com/javase/technologies/desktop/media/jmf/2.1.1/support-rtsp.html
The method has been renamed to findById(…)
returning an Optional
so that you have to handle absence yourself:
Optional<Foo> result = repository.findById(…);
result.ifPresent(it -> …); // do something with the value if present
result.map(it -> …); // map the value if present
Foo foo = result.orElse(null); // if you want to continue just like before
follow the below steps to solve this issue in pgadmin:
SET client_encoding = 'ISO_8859_5';
COPY tablename(column names) FROM 'D:/DB_BAK/csvfilename.csv' WITH DELIMITER ',' CSV ;
This is how I toggle two div
s at the same time:
$('#login-form, #recover-password').toggle();
It works!
Maybe a simpler solution is to set an overlay in front of your map using FrameLayout
or RelativeLayout
and treating them as regular buttons in your activity. You should declare your layers in back to front order, e.g., map before buttons. I modified your layout, simplified it a little bit. Try the following layout and see if it works for you:
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MapActivity" >
<fragment xmlns:map="http://schemas.android.com/apk/res-auto"
android:id="@+id/map"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:scrollbars="vertical"
class="com.google.android.gms.maps.SupportMapFragment"/>
<RadioGroup
android:id="@+id/radio_group_list_selector"
android:layout_width="match_parent"
android:layout_height="48dp"
android:orientation="horizontal"
android:background="#80000000"
android:padding="4dp" >
<RadioButton
android:id="@+id/radioPopular"
android:layout_width="0dp"
android:layout_height="match_parent"
android:text="@string/Popular"
android:gravity="center_horizontal|center_vertical"
android:layout_weight="1"
android:background="@drawable/shape_radiobutton"
android:textColor="@color/textcolor_radiobutton" />
<View
android:id="@+id/VerticalLine"
android:layout_width="1dip"
android:layout_height="match_parent"
android:background="#aaa" />
<RadioButton
android:id="@+id/radioAZ"
android:layout_width="0dp"
android:layout_height="match_parent"
android:gravity="center_horizontal|center_vertical"
android:text="@string/AZ"
android:layout_weight="1"
android:background="@drawable/shape_radiobutton2"
android:textColor="@color/textcolor_radiobutton" />
<View
android:id="@+id/VerticalLine"
android:layout_width="1dip"
android:layout_height="match_parent"
android:background="#aaa" />
<RadioButton
android:id="@+id/radioCategory"
android:layout_width="0dp"
android:layout_height="match_parent"
android:gravity="center_horizontal|center_vertical"
android:text="@string/Category"
android:layout_weight="1"
android:background="@drawable/shape_radiobutton2"
android:textColor="@color/textcolor_radiobutton" />
<View
android:id="@+id/VerticalLine"
android:layout_width="1dip"
android:layout_height="match_parent"
android:background="#aaa" />
<RadioButton
android:id="@+id/radioNearBy"
android:layout_width="0dp"
android:layout_height="match_parent"
android:gravity="center_horizontal|center_vertical"
android:text="@string/NearBy"
android:layout_weight="1"
android:background="@drawable/shape_radiobutton3"
android:textColor="@color/textcolor_radiobutton" />
</RadioGroup>
</FrameLayout>
The above query returns the list of Object[]. So if you want to get the u.name and s.something from the list then you need to iterate and cast that values for the corresponding classes.
import json
data = json.load(open('/Users/laxmanjeergal/Desktop/json.json'))
jtopy=json.dumps(data) #json.dumps take a dictionary as input and returns a string as output.
dict_json=json.loads(jtopy) # json.loads take a string as input and returns a dictionary as output.
print(dict_json["shipments"])
history | tail -2 | head -1 | cut -c8-999
tail -2
returns the last two command lines from history
head -1
returns just first line
cut -c8-999
returns just command line, removing PID and spaces.
The reason is actually very simple. When using a query parameter you can take in characters such as "/" and your client does not need to html encode them. There are other reasons but that is a simple example. As for when to use a path variable. I would say whenever you are dealing with ids or if the path variable is a direction for a query.
Assuming the following command works successfully:
mysql -u username -p -h remote.site.com
The syntax for mysqldump
is identical, and outputs the database dump to stdout
. Redirect the output to a local file on the computer:
mysqldump -u username -p -h remote.site.com DBNAME > backup.sql
Replace DBNAME
with the name of the database you'd like to download to your computer.
By adding fragment_tran.addToBackStack(null)
on last fragment, I am able to do come back on last fragment.
adding new fragment:
view.findViewById(R.id.changepass).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
FragmentTransaction transaction = getActivity().getSupportFragmentManager().beginTransaction();
transaction.replace(R.id.container, new ChangePassword());
transaction.addToBackStack(null);
transaction.commit();
}
});
Just use "Key" and "Value"
As I got the 500.19, I gave IIS_IUSRS
full access rights for the mentioned web.config and for the folder of the project. This solved the issue.
You can give permissions by
IIS_IUSRS
- don't forget the i in front of USRS and don't write an "e" as in USERS$("#table tr").click(function(){
$(this).addClass('selected').siblings().removeClass('selected');
var value=$(this).find('td:first').html();
alert(value);
});
$('.ok').on('click', function(e){
alert($("#table tr.selected td:first").html());
});
Demo:
The traditional way to transform a string to a UTF-8 string is as follows:
StrConv("hello world",vbFromUnicode)
So put simply:
Dim fnum As Integer
fnum = FreeFile
Open "myfile.txt" For Output As fnum
Print #fnum, StrConv("special characters: äöüß", vbFromUnicode)
Close fnum
No special COM objects required
By default, you need to use keys to ssh into your google compute engine machine, but you can turn on password authentication if you do not need that level of security.
Tip: Use the Open in browser window SSH option from your cloud console to gain access to the machine. Then switch to the root user with
sudo su - root
to make the configuration changes below.
/etc/ssh/sshd_config
file.PasswordAuthentication
and ChallengeResponseAuthentication
to yes
./etc/init.d/ssh restart
.Just add this namespace,
using System.Linq;
You could also use React's useState
hook to declare local state for a function component. The initial state of the variable toggled
has been passed as an argument to the method .useState
.
import { render } from 'react-dom';
import React from "react";
type Props = {
text: string,
onClick(event: React.MouseEvent<HTMLButtonElement>): void,
};
export function HelloWorldButton(props: Props) {
const [toggled, setToggled] = React.useState(false); // returns a stateful value, and a function to update it
return <button
onClick={(event) => {
setToggled(!toggled);
props.onClick(event);
}}
>{props.text} (toggled: {toggled.toString()})</button>;
}
render(<HelloWorldButton text='Hello World' onClick={() => console.log('clicked!')} />, document.getElementById('root'));
I know there are several good answers here but this is what I needed so I figured I'd add this code in case anyone else needs to return whatever status code and response body they wanted in 4.7.x with webAPI.
public class DuplicateResponseResult<TResponse> : IHttpActionResult
{
private TResponse _response;
private HttpStatusCode _statusCode;
private HttpRequestMessage _httpRequestMessage;
public DuplicateResponseResult(HttpRequestMessage httpRequestMessage, TResponse response, HttpStatusCode statusCode)
{
_httpRequestMessage = httpRequestMessage;
_response = response;
_statusCode = statusCode;
}
public Task<HttpResponseMessage> ExecuteAsync(CancellationToken cancellationToken)
{
var response = new HttpResponseMessage(_statusCode);
return Task.FromResult(_httpRequestMessage.CreateResponse(_statusCode, _response));
}
}
Here's my solution:
String s = Integer.toBinaryString(5); //Convert decimal to binary
int p = 8; //preferred length
for(int g=0,j=s.length();g<p-j;g++, s= "0" + s);
System.out.println(s);
Output: 00000101
>>> dict(zip([1, 2, 3, 4], ['a', 'b', 'c', 'd']))
{1: 'a', 2: 'b', 3: 'c', 4: 'd'}
If they are not the same size, zip
will truncate the longer one.
I switched over to the managed ODP.NET assemblies from Oracle. I also had to purge all the files from the IIS web apps that were using the older assemblies. Now I don't get any conflicts regarding 32 vs 64 bit versions when I debug in IIS Express vs IIS. See the following article.
You don't need a FK, you can join arbitrary columns.
But having a foreign key ensures that the join will actually succeed in finding something.
Foreign key give you certain guarantees that would be extremely difficult and error prone to implement otherwise.
For example, if you don't have a foreign key, you might insert a detail record in the system and just after you checked that the matching master record is present somebody else deletes it. So in order to prevent this you need to lock the master table, when ever you modify the detail table (and vice versa). If you don't need/want that guarantee, screw the FKs.
Depending on your RDBMS a foreign key also might improve performance of select (but also degrades performance of updates, inserts and deletes)
An example of how to implement it:
public bool ValidateSocialSecNumber(string socialSecNumber)
{
//Accepts only 10 digits, no more no less. (Like Mike's answer)
Regex pattern = new Regex(@"(?<!\d)\d{10}(?!\d)");
if(pattern.isMatch(socialSecNumber))
{
//Do something
return true;
}
else
{
return false;
}
}
You could've also done it in another way by e.g. using Match
and then wrapping a try-catch block around the pattern matching. However, if a wrong input is given quite often, it's quite expensive to throw an exception. Thus, I prefer the above way, in simple cases at least.
As th function is not using $this
at all, you can add a static
keyword just after public and then call
Functions::filter($_GET['params']);
Avoiding the creation of an object just for one method call
In the end I opted for using Vue's ref
directive. This allows a component to be referenced from the parent for direct access.
E.g.
Have a compenent registered on my parent instance:
var vm = new Vue({
el: '#app',
components: { 'my-component': myComponent }
});
Render the component in template/html with a reference:
<my-component ref="foo"></my-component>
Now, elsewhere I can access the component externally
<script>
vm.$refs.foo.doSomething(); //assuming my component has a doSomething() method
</script>
See this fiddle for an example: https://jsfiddle.net/xmqgnbu3/1/
(old example using Vue 1: https://jsfiddle.net/6v7y6msr/)
it's quite handy with {data.table} and {stringr}
library(data.table)
library(stringr)
x[, lapply(.SD, function(xx) {str_replace_na(xx, 0)})]
FYI
Just Remove the type="text/javascript"
<script src="JavaScript/jquery.js" />
<script src="JavaScript/bootstrap-min.js" />
Here is the update - http://jsfiddle.net/andieje/kRX6n/
Though you can have several <form>
elements in one HTML page, you cannot nest them.
Instance of java.util.Date stores a date. So how can you store nothing in it or have it empty? It can only store references to instances of java.util.Date
. If you make it null
means that it is not referring any instance of java.util.Date
.
You have tried date2="";
what you mean to do by this statement you want to reference the instance of String
to a variable that is suppose to store java.util.Date
. This is not possible as Java is Strongly Typed Language.
Edit
After seeing the comment posted to the answer of LastFreeNickname
I am having a form that the date textbox should be by default blank in the textbox, however while submitting the data if the user didn't enter anything, it should accept it
I would suggest you could check if the textbox is empty. And if it is empty, then you could store default date in your variable or current date or may be assign it null
as shown below:
if(textBox.getText() == null || textBox.getText().equals(""){
date2 = null; // For Null;
// date2 = new Date(); For Current Date
// date2 = new Date(0); For Default Date
}
Also I can assume since you are asking user to enter a date in a TextBox
, you are using a DateFormat
to parse the text that is entered in the TextBox
. If this is the case you could simply call the dateFormat.parse()
which throws a ParseException
if the format in which the date was written is incorrect or is empty string. Here in the catch
block you could put the above statements as show below:
try{
date2 = dateFormat.parse(textBox.getText());
}catch(ParseException e){
date2 = null; // For Null;
// date2 = new Date(); For Current Date
// date2 = new Date(0); For Default Date
}
There is a quite easy and useful solution for creating an INSERT Statement for editing without the need to export SQL with just Copy & Paste (Clipboard):
The “depth” (or equivalently the “level number”) of a node is the number of edges on the “path” from the root node
The “height” of a node is the number of edges on the longest path from the node to a leaf node.
This is ages too late, but good for anyone that is searching the topic. If you're not innoDB, and you're not worried about locking while you dump simply use the option:
--lock-tables=false
because the OR operator will return true if any one of the conditions is true, and in your code there are two conditions that are true.
this is one good answer to figure out how sorting works from another user and I will add my notes to know how it is not fully correct and what is correct:
The effect on the formula after a sort is the same as copying. A sort does not move the row contents, it copies them. The formula may (or may not depending on the abs/relative references) use new data, just as a copied formula does.
My point is that if the formula can be copied from 1 row to another and the effects don't change, the sorting will not affect the formula results. If the formulas are so complex and so dependent on position that copying them changes the relative contents, then don't sort them.
And my note that I experienced in practice:
The above user is saying right but in fact It has some exception: parts of a columns formula containing sheet name (like sheet1!A1) are treated as absolute references (in spite of copying that changes the references if they are relative ) so that part of formula will be copied without changing references relative to changing the place of formula This includes current sheet cells addressed fully like : sheet1!A2 and will be treated as absolute references(for sorting only) I tested this of excel 2010 and I do not think this issue be solved in other versions. The solution is to copy and past special as value in another place and then use sorting.
Here is the official documentation of ArrayList.get().
Anyway it is very simple, for example
ArrayList list = new ArrayList();
list.add("1");
list.add("2");
list.add("3");
String str = (String) list.get(0); // here you get "1" in str
Today 2020.09.17 I perform tests on MacOs HighSierra 10.13.6 on Chrome v85, Safari v13.1.2 and Firefox v80 for chosen solutions.
For all browsers (and both test cases)
typeof||instanceof
(A, I) and x===x+''
(H) are fast/fastest_.isString
(lodash lib) is medium/fastUpdate: 2020.11.28 I update results for x=123 Chrome
column - for solution I
there was probably an error value before (=69M too low) - I use Chrome 86.0 to repeat tests.
I perform 2 tests cases for solutions A B C D E F G H I J K L
Below snippet presents differences between solutions
// https://stackoverflow.com/a/9436948/860099
function A(x) {
return (typeof x == 'string') || (x instanceof String)
}
// https://stackoverflow.com/a/17772086/860099
function B(x) {
return Object.prototype.toString.call(x) === "[object String]"
}
// https://stackoverflow.com/a/20958909/860099
function C(x) {
return _.isString(x);
}
// https://stackoverflow.com/a/20958909/860099
function D(x) {
return $.type(x) === "string";
}
// https://stackoverflow.com/a/16215800/860099
function E(x) {
return x?.constructor === String;
}
// https://stackoverflow.com/a/42493631/860099
function F(x){
return x?.charAt != null
}
// https://stackoverflow.com/a/57443488/860099
function G(x){
return String(x) === x
}
// https://stackoverflow.com/a/19057360/860099
function H(x){
return x === x + ''
}
// https://stackoverflow.com/a/4059166/860099
function I(x) {
return typeof x == 'string'
}
// https://stackoverflow.com/a/28722301/860099
function J(x){
return x === x?.toString()
}
// https://stackoverflow.com/a/58892465/860099
function K(x){
return x && typeof x.valueOf() === "string"
}
// https://stackoverflow.com/a/9436948/860099
function L(x) {
return x instanceof String
}
// ------------------
// PRESENTATION
// ------------------
console.log('Solutions results for different inputs \n\n');
console.log("'abc' Str '' ' ' '1' '0' 1 0 {} [] true false null undef");
let tests = [ 'abc', new String("abc"),'',' ','1','0',1,0,{},[],true,false,null,undefined];
[A,B,C,D,E,F,G,H,I,J,K,L].map(f=> {
console.log(
`${f.name} ` + tests.map(v=> (1*!!f(v)) ).join` `
)})
_x000D_
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.20/lodash.min.js" integrity="sha512-90vH1Z83AJY9DmlWa8WkjkV79yfS2n2Oxhsi2dZbIv0nC4E6m5AbH8Nh156kkM7JePmqD6tcZsfad1ueoaovww==" crossorigin="anonymous"></script>
This shippet only presents functions used in performance tests - it not perform tests itself!
_x000D_
And here are example results for chrome
EDMX model won't work with EF7 but I've found a Community/Professional product which seems to be very powerfull : http://www.devart.com/entitydeveloper/editions.html
Kafka is a distributed system and needs Zookeeper. you have to start zookeeper too. Follow "Quick Start" here : https://kafka.apache.org/0100/documentation.html#quickstart
I have used this small snippet. Might be slower but works every time.
for i in 'find . -type f -name "*.jar"'; do
jar tvf $i | grep "com.foo.bar.MyClass.clss";
if [ $? -eq 0 ]; then echo $i; fi;
done
ALTER TABLE Table name ADD column datatype AUTO_INCREMENT,ADD primary key(column);
I am doing some basic array in JGrasp and found that with an accessor method for a char[][] array to use ('.') to place a single dot.
//Simple & effective way to get client mac address
// Turn on output buffering
ob_start();
//Get the ipconfig details using system commond
system('ipconfig /all');
// Capture the output into a variable
$mycom=ob_get_contents();
// Clean (erase) the output buffer
ob_clean();
$findme = "Physical";
//Search the "Physical" | Find the position of Physical text
$pmac = strpos($mycom, $findme);
// Get Physical Address
$mac=substr($mycom,($pmac+36),17);
//Display Mac Address
echo $mac;
For images, you could get the available codecs from GDI (System.Drawing) and build your list from that with a little work. This would be the most flexible way to go.
ImageCodecInfo[] codecs = ImageCodecInfo.GetImageEncoders();
Mockito has limitations testing final, static, and private methods.
with jMockit testing library, you can do few stuff very easy and straight-forward as below:
Mock constructor of a java.io.File class:
new MockUp<File>(){
@Mock
public void $init(String pathname){
System.out.println(pathname);
// or do whatever you want
}
};
Mock a static method:
You can try another way like that:
<div class="content">
Australia
</div>
jQuery code:
$(".content").css({
background: "#d1d1d1",
fontSize: "30px"
})
Now you can add more css property as you want.
You can download tesseract-ocr setup using the following link,
Then add new variable with name tesseract in environment variables with value C:\Program Files (x86)\Tesseract-OCR\tesseract.exe
You need to upgrade your pip installation because it is still using http
instead of https
.
The --index-url
(short version: -i
) option allows you to specify an index-url in the call to pip itself, there you can use the https-variant. Then you can instruct pip to upgrade itself.
sudo pip install --index-url https://pypi.python.org/simple/ --upgrade pip
Afterwards you should be able to use pip without the --index-url
option.
I believe that the release 7.0.0 (2015-05-21) triggered this issue. The release note for that version states the following:
BACKWARD INCOMPATIBLE No longer implicitly support an insecure origin origin, and instead require insecure origins be explicitly trusted with the
--trusted-host
option.
You can check your pip version with pip --version
.
This would mean that issuing sudo pip install --trusted-host --upgrade pip
once would also solve this issue, albeit download pip over insecure http. This might also not work at all, because it is possible that the insecure endpoint is no longer accessible on the server (I have not tested this).
In Python 3.8+ you can do
import hashlib
with open("your_filename.png", "rb") as f:
file_hash = hashlib.md5()
while chunk := f.read(8192):
file_hash.update(chunk)
print(file_hash.digest())
print(file_hash.hexdigest()) # to get a printable str instead of bytes
On Python 3.7 and below:
with open("your_filename.png", "rb") as f:
file_hash = hashlib.md5()
chunk = f.read(8192)
while chunk:
file_hash.update(chunk)
chunk = f.read(8192)
print(file_hash.hexdigest())
This reads the file 8192 (or 2¹³) bytes at a time instead of all at once with f.read()
to use less memory.
Consider using hashlib.blake2b
instead of md5
(just replace md5
with blake2b
in the above snippets). It's cryptographically secure and faster than MD5.
I have found it easiest to use a graphical interface on windows (I recommend mobaXTerm it has ssh, scp, ftp, remote desktop, and many more) but if you are set on command line I would recommend cd'ing into the directory with the source folder then
scp -r yourFolder username@server:/path/to/dir
the -r
indicates recursive to be used on directories
I did achieve this like so
form i {_x000D_
left: -25px;_x000D_
top: 23px;_x000D_
border: none;_x000D_
position: relative;_x000D_
padding: 0;_x000D_
margin: 0;_x000D_
float: left;_x000D_
color: #29a038;_x000D_
}
_x000D_
<form>_x000D_
_x000D_
<i class="fa fa-link"></i>_x000D_
_x000D_
<div class="form-group string optional profile_website">_x000D_
<input class="string optional form-control" placeholder="http://your-website.com" type="text" name="profile[website]" id="profile_website">_x000D_
</div>_x000D_
_x000D_
<i class="fa fa-facebook"></i>_x000D_
<div class="form-group url optional profile_facebook_url">_x000D_
<input class="string url optional form-control" placeholder="http://facebook.com/your-account" type="url" name="profile[facebook_url]" id="profile_facebook_url">_x000D_
</div>_x000D_
_x000D_
<i class="fa fa-twitter"></i>_x000D_
<div class="form-group url optional profile_twitter_url">_x000D_
<input class="string url optional form-control" placeholder="http://twitter.com/your-account" type="url" name="profile[twitter_url]" id="profile_twitter_url">_x000D_
</div>_x000D_
_x000D_
<i class="fa fa-instagram"></i>_x000D_
<div class="form-group url optional profile_instagram_url">_x000D_
<input class="string url optional form-control" placeholder="http://instagram.com/your-account" type="url" name="profile[instagram_url]" id="profile_instagram_url">_x000D_
</div>_x000D_
_x000D_
<input type="submit" name="commit" value="Add profile">_x000D_
</form>
_x000D_
The result looks like this:
Please note that I am using Ruby on Rails so my resulting code looks a bit blown up. The view code in slim is actually very concise:
i.fa.fa-link
= f.input :website, label: false
i.fa.fa-facebook
= f.input :facebook_url, label: false
i.fa.fa-twitter
= f.input :twitter_url, label: false
i.fa.fa-instagram
= f.input :instagram_url, label: false
So, I tried just about everything here and want to contribute one more solution that fixed all of my problems. My issues was not with line endings or actual permissions or anything like that. It was because I had installed Cygwin and whole host of stuff that comes with that, which unbeknownst to me also installed its own version of git. I never noticed this, just that I was having strange issues with users and files being marked as changed (because of perms changes).
It turns out that I figured this out because I thought I should just update Git to the latest version, which I did, but running git --version
returned the old version number. After the ensuing hunt for why, I found the cygwin bin directory root in my environment path, which contained a git executable, running at the old version number. Go figure.
This was also hard to find because I have TortoiseGit installed. My command line tools would use the cygwin version due to path fallbacks, and TortoiseGit was configured to use the windows version, making it even more confusing.
Hope this helps somebody.
In addition, you can simply convert byte array
to Bitmap
.
var bmp = new Bitmap(new MemoryStream(imgByte));
You can also get Bitmap
from file Path directly.
Bitmap bmp = new Bitmap(Image.FromFile(filePath));
I wanted to use the C++11 answer, but I could not because GCC 4.9 does not support std::put_time.
std::put_time implementation status in GCC?
I ended up using some C++11 to slightly improve the non-C++11 answer. For those that can't use GCC 5, but would still like some C++11 in their date/time format:
std::array<char, 64> buffer;
buffer.fill(0);
time_t rawtime;
time(&rawtime);
const auto timeinfo = localtime(&rawtime);
strftime(buffer.data(), sizeof(buffer), "%d-%m-%Y %H-%M-%S", timeinfo);
std::string timeStr(buffer.data());
Storm's answer is not correct. No hard feelings Storm, and apologies to the OP as I'm a bit late to the party here (wish I could have helped sooner, but I didn't run into the problem until today, or this stack overflow answer until I was figuring out a solution.)
The Visual C++ 2003 runtime was not available as a seperate download because it was included with the .NET 1.1 runtime.
If you install the .NET 1.1 runtime you will get msvcr71.dll installed, and in addition added to C:\WINDOWS\Microsoft.NET\Framework\v1.1.4322.
The .NET 1.1 runtime is available here: http://www.microsoft.com/downloads/en/details.aspx?familyid=262d25e3-f589-4842-8157-034d1e7cf3a3&displaylang=en (23.1 MB)
If you are looking for a file that ends with a "P" such as msvcp71.dll, this indicates that your file was compiled against a C++ runtime (as opposed to a C runtime), in some situations I noticed these files were only installed when I installed the full SDK. If you need one of these files, you may need to install the full .NET 1.1 SDK as well, which is available here: http://www.microsoft.com/downloads/en/details.aspx?FamilyID=9b3a2ca6-3647-4070-9f41-a333c6b9181d (106.2 MB)
After installing the SDK I now have both msvcr71.dll and msvcp71.dll in my System32 folder, and the application I'm trying to run (boomerang c++ decompiler) works fine without any missing DLL errors.
Also on a side note: be VERY aware of the difference between a Hotfix Update and a Regular Update. As noted in the linked KB932298 download (linked below by Storm): "Please be aware this Hotfix has not gone through full Microsoft product regression testing nor has it been tested in combination with other Hotfixes."
Hotfixes are NOT meant for general users, but rather users who are facing a very specific problem. As described in the article only install that Hotfix if you are have having specific daylight savings time issues with the rules that changed in 2007. -- Likely this was a pre-release for customers who "just couldn't wait" for the official update (probably for some business critical application) -- for regular users Windows Update should be all you need.
Thanks, and I hope this helps others who run into this issue!
char
: fixed-length character data with a maximum length of 8000 characters.nchar
: fixed-length unicode data with a maximum length of 4000 characters.Char
= 8 bit lengthNChar
= 16 bit lengthEDIT: several years since this question was first answered, as noted in a newer answer, there is now a command for this:
nvm now has a command to update npm. It's
nvm install-latest-npm
ornvm install --latest-npm
.
nvm install-latest-npm
: Attempt to upgrade to the latest working npm
on the current node version
nvm install --latest-npm
: After installing, attempt to upgrade to the latest working npm on the given node version
Below are previous revisions of the correct answer to this question.
Over three years after this question was first asked, it seems like the answer is much simpler now. Just update the version that nvm installed, which lives in ~/.nvm/versions/node/[your-version]/lib/node_modules/npm
.
I just installed node 4.2.2, which comes with npm 2.14.7, but I want to use npm 3. So I did:
cd ~/.nvm/versions/node/v4.2.2/lib
npm install npm
Easy!
And yes, this should work for any module, not just npm, that you want to be "global" for a specific version of node.
EDIT 1: In the newest version, npm -g
is smart and installs modules into the path above instead of the system global path.
Thanks @philraj for pointing this out in a comment.
In the code below, Class A
implements the interface IShow
and implements its method ShowData
. Class B
inherits Class A
. In order to use ShowData
method in Class B
, we have to use keyword new
in the ShowData
method in order to hide the base class Class A
method and use override
keyword in order to extend the method.
interface IShow
{
protected void ShowData();
}
class A : IShow
{
protected void ShowData()
{
Console.WriteLine("This is Class A");
}
}
class B : A
{
protected new void ShowData()
{
Console.WriteLine("This is Class B");
}
}
In [34]: import pandas as pd
In [35]: import numpy as np
In [36]: df = pd.DataFrame([1,2,3,4], columns=["data"])
In [37]: df
Out[37]:
data
0 1
1 2
2 3
3 4
In [38]: df["desired_output"] = np.where(df["data"] <2.5, "False", "True")
In [39]: df
Out[39]:
data desired_output
0 1 False
1 2 False
2 3 True
3 4 True
Other than syntax, a switch can be implemented using a tree which makes it O(log n)
, while a if/else has to be implemented with an O(n)
procedural approach. More often they are both processed procedurally and the only difference is syntax, and moreover does it really matter -- unless you're statically typing 10k cases of if/else anyway?
It is a unicode char \u003C = <
The thing is that you are using the option -t
when running your container.
Could you check if enabling the tty
option (see reference) in your docker-compose.yml file the container keeps running?
version: '2'
services:
ubuntu:
build: .
container_name: ubuntu
volumes:
- ~/sph/laravel52:/www/laravel
ports:
- "80:80"
tty: true
I found that i had git: false in settings.json. Changed it to true and works now.
As of Pandas 0.18 one way to do this is to use the sort_index
method of the grouped data.
Here's an example:
np.random.seed(1)
n=10
df = pd.DataFrame({'mygroups' : np.random.choice(['dogs','cats','cows','chickens'], size=n),
'data' : np.random.randint(1000, size=n)})
grouped = df.groupby('mygroups', sort=False).sum()
grouped.sort_index(ascending=False)
print grouped
data
mygroups
dogs 1831
chickens 1446
cats 933
As you can see, the groupby column is sorted descending now, indstead of the default which is ascending.
If you want to pass arguments to the middle of an npm script, as opposed to just having them appended to the end, then inline environment variables seem to work nicely:
"scripts": {
"dev": "BABEL_ARGS=-w npm run build && cd lib/server && nodemon index.js",
"start": "npm run build && node lib/server/index.js",
"build": "mkdir -p lib && babel $BABEL_ARGS -s inline --stage 0 src -d lib",
},
Here, npm run dev
passes the -w
watch flag to babel, but npm run start
just runs a regular build once.
Try using xmltype.createxml(xml)
.
As in,
select extract(xmltype.createxml(xml), '//fax').getStringVal() from mytab;
It worked for me.
If you want to improve or manipulate even further.
Try something like this.
Select *
from xmltable(xmlnamespaces('some-name-space' as "ns",
'another-name-space' as "ns1",
),
'/ns/ns1/foo/bar'
passing xmltype.createxml(xml)
columns id varchar2(10) path '//ns//ns1/id',
idboss varchar2(500) path '//ns0//ns1/idboss',
etc....
) nice_xml_table
Hope it helps someone.
Sending data from formfields back to the server (php) is usualy done by the POST method which can be found back in the superglobal array $_POST inside PHP. There is no need to transform it to JSON before you send it to the server. Little example:
<?php
if($_SERVER['REQUEST_METHOD'] == 'POST')
{
echo '<pre>';
print_r($_POST);
}
?>
<form action="" method="post">
<input type="text" name="email" value="[email protected]" />
<button type="submit">Send!</button>
With AJAX you are able to do exactly the same thing, only without page refresh.
Dead-simple and easy to read!
"mrap"
from nicknames
as a String from this JSON response{
"other": {
"nicknames": ["mrap", "Mikee"]
}
It takes your json data NSData
as it is, no need to preprocess.
let parser = JSONParser(jsonData)
if let handle = parser.getString("other.nicknames[0]") {
// that's it!
}
Disclaimer: I made this and I hope it helps everyone. Feel free to improve on it!
I'll try a standard "Why are you doing it this way?" answer... Do you know about java.net.URL
?
URL url = new URL(stringURL);
The above will throw a MalformedURLException
if it can't parse the URL.
You have an array that is the "hash table".
In Open Hashing each cell in the array points to a list containg the collisions. The hashing has produced the same index for all items in the linked list.
In Closed Hashing you use only one array for everything. You store the collisions in the same array. The trick is to use some smart way to jump from collision to collision unitl you find what you want. And do this in a reproducible / deterministic way.
Add rich comparison operators to the object class, then use sort() method of the list.
See rich comparison in python.
Update: Although this method would work, I think solution from Triptych is better suited to your case because way simpler.
<p style="color:black">Shop our collection of beautiful women's <br> <span> wedding ring in classic & modern design.</span></p>
Remove <br>
effect using CSS.
<style> p br{ display:none; } </style>
This can be done using a custom template filter. Consider rendering your form this way:
<form action="/contact/" method="post">
{{ form.non_field_errors }}
<div class="fieldWrapper">
{{ form.subject.errors }}
{{ form.subject.label_tag }}
{{ form.subject }}
<span class="helptext">{{ form.subject.help_text }}</span>
</div>
</form>
form.subject
is an instance of BoundField
which has the as_widget()
method.
You can create a custom filter addclass
in my_app/templatetags/myfilters.py:
from django import template
register = template.Library()
@register.filter(name='addclass')
def addclass(value, arg):
return value.as_widget(attrs={'class': arg})
And then apply your filter:
{% load myfilters %}
<form action="/contact/" method="post">
{{ form.non_field_errors }}
<div class="fieldWrapper">
{{ form.subject.errors }}
{{ form.subject.label_tag }}
{{ form.subject|addclass:'MyClass' }}
<span class="helptext">{{ form.subject.help_text }}</span>
</div>
</form>
form.subjects
will then be rendered with the MyClass
CSS class.
This worked for me:
DELETE from m_productprice
WHERE m_pricelist_version_id='1000020'
AND m_product_id IN (SELECT m_product_id
FROM m_product
WHERE upc = '7094');
You can use a prototype assignment within the constructor definition.
The variable will be visible to the prototype added method but all the instances of the functions will access the same SHARED variable.
function A()
{
var sharedVar = 0;
this.local = "";
A.prototype.increment = function(lval)
{
if (lval) this.local = lval;
alert((++sharedVar) + " while this.p is still " + this.local);
}
}
var a = new A();
var b = new A();
a.increment("I belong to a");
b.increment("I belong to b");
a.increment();
b.increment();
I hope this can be usefull.
You must sort your data according your needs (es. in reverse order) and use select top query
My 5 cents; You can just install the entire (pre-compiled) SciPy from https://github.com/scipy/scipy/releases
Good Luck!
In addition to the differences mentioned in other answers, there also is a speed difference. d = {} is over twice as fast:
python -m timeit -s "d = {}" "for i in xrange(500000): d.clear()"
10 loops, best of 3: 127 msec per loop
python -m timeit -s "d = {}" "for i in xrange(500000): d = {}"
10 loops, best of 3: 53.6 msec per loop
In Apache I edit the following configuration file: C:\xampp\php.ini
I make sure to have the following lines uncommented:
extension=php_pgsql.dll
extension=php_pdo_pgsql.dll
Finally restart Apache before attempting a new connection to the database engine.
Also, I leave my code that ensures that the connection is unique:
private static $pdo = null;
public static function provideDataBaseInstance() {
if (self::$pdo == null) {
$dsn = "pgsql:host=" . HOST .
";port=5432;dbname=" . DATABASE .
";user=" . POSTGRESQL_USER .
";password=" . POSTGRESQL_PASSWORD;
try {
self::$pdo = new PDO($dsn);
} catch (PDOException $exception) {
$msg = $exception->getMessage();
echo $msg .
". Do not forget to enable in the web server the database
manager for php and in the database instance authorize the
ip of the server instance if they not in the same
instance.";
}
}
return self::$pdo;
}
GL
You either use :
background-image: url("images/plaid.jpg");
background-repeat: no-repeat;
... or
background: transparent url("images/plaid.jpg") top left no-repeat;
... but definitively not
background-image: url("images/plaid.jpg") no-repeat;
EDIT : Demo at JSFIDDLE using absolute paths (in case you have troubles referring to your images with relative paths).
Here is my version based on the @peterincumbria answer:
using var scope = _serviceProvider.CreateScope();
var dbContext = scope.ServiceProvider.GetRequiredService<AppDbContext>();
return await dbContext.Database.CanConnectAsync(cToken);
I'm using Observable for polling health checking by interval and handling return value of the function.
try-catch
is not needed here because:
The following steps walk you through how to:
**Generating SSH keys without a passphrase is unwise if your work is particularly sensitive.
OS - Fedora 28 | Editor - VS Code v1.23.0 | Repository - Git
Generate SSH keys:
ssh-keygen -t rsa -C "[email protected]"
After completing the above steps, the location of your public key is shown in the terminal window. If the currently logged in user is 'bob' the location of your public key would be /home/bob/.ssh/id_rsa.pub
Copy and import public key to GitHub:
cat /home/bob/.ssh/id_rsa.pub
Copy the whole public key that is now displayed in your terminal window to the clipboard
Confirm the above steps:
ssh -T [email protected]
yes
Hi ! You've successfully authenticated, but GitHub does not provide shell access.
First commit / push without having to enter a username / password:
- touch test.txt
git add test.txt
git commit
- opens editor, enter a message and save the file. If vi is your editor, press i
once the file opens, enter a message, press esc, and then enter :x
to save changes.
git push
The only hiccup you may encounter is when you attempt to SSH to GitHub. This link will provide some assistance -
Happy hunting!
In combination with the above answer, you want to ask jq for raw output, so your last filter should be eg.:
cat input.json | jq -r 'keys'
From jq help:
-r output raw strings, not JSON texts;
In the simple setup you are likely using, getchar
works with buffered input, so you have to press enter before getchar gets anything to read. Strings are not terminated by EOF
; in fact, EOF
is not really a character, but a magic value that indicates the end of the file. But EOF
is not part of the string read. It's what getchar
returns when there is nothing left to read.
if you want to specifically find strings which ends with desired characters then this would help you...
select * from tablename where col_name like '%190'
For Sharepoint 2007
C:\Program Files\Common Files\Microsoft Shared\web server extensions\12\LOGS
Following example uses InputBox method to validate user entry to unhide sheets: Important thing here is to use wrap InputBox variable inside StrPtr so it could be compared to '0' when user chose to click 'x' icon on the InputBox.
Sub unhidesheet()
Dim ws As Worksheet
Dim pw As String
pw = InputBox("Enter Password to Unhide Sheets:", "Unhide Data Sheets")
If StrPtr(pw) = 0 Then
Exit Sub
ElseIf pw = NullString Then
Exit Sub
ElseIf pw = 123456 Then
For Each ws In ThisWorkbook.Worksheets
ws.Visible = xlSheetVisible
Next
End If
End Sub
Let's keep them simple, shall we. First off, using pure HTML + CSS:
<div id="emotion">
<input type="radio" name="emotion" id="sad" />
<label for="sad"><img src="sad_image.png" alt="I'm sad" /></label>
<input type="radio" name="emotion" id="happy" />
<label for="happy"><img src="happy_image.png" alt="I'm happy" /></label>
</div>
This will degrade nicely if there's no JavaScript. Use id
and for
attributes to link up the label and radiobutton so that when the image is selected, the corresponding radiobutton will be filled. This is important because we'll need to hide the actual radiobutton using JavaScript. Now for some jQuery goodness. First off, creating the CSS we'll need:
.input_hidden {
position: absolute;
left: -9999px;
}
.selected {
background-color: #ccc;
}
#emotion label {
display: inline-block;
cursor: pointer;
}
#emotion label img {
padding: 3px;
}
Now for the JavaScript:
$('#emotion input:radio').addClass('input_hidden');
$('#emotion label').click(function(){
$(this).addClass('selected').siblings().removeClass('selected');
});
The reason why we're not using display: none
here is for accessibility reasons. See: http://www.jsfiddle.net/yijiang/Zgh24/1 for a live demo, with something more fancy.
Here is the only answer that managed to work for my problem, got it figured out with the help of this webpage (nice reference).
powershell -command "& {&'some-command' someParam}"
Also, here is a neat way to do multiple commands:
powershell -command "& {&'some-command' someParam}"; "& {&'some-command' -SpecificArg someParam}"
For example, this is how I ran my 2 commands:
powershell -command "& {&'Import-Module' AppLocker}"; "& {&'Set-AppLockerPolicy' -XmlPolicy myXmlFilePath.xml}"
The best solution is not to use the same element for column and panel:
<div class="row">
<div class="col-md-3">
<div class="panel" id="gameplay-away-team">Away Team</div>
</div>
<div class="col-md-6">
<div class="panel" id="gameplay-baseball-field">Baseball Field</div>
</div>
<div class="col-md-3">
<div class="panel" id="gameplay-home-team">Home Team</div>
</div>
</div>
and some more styles:
#gameplay-baseball-field {
padding-right: 10px;
padding-left: 10px;
}
That's generally controlled by the profile associated with the user Tomcat is connecting as.
SQL> SELECT PROFILE, LIMIT FROM DBA_PROFILES WHERE RESOURCE_NAME = 'IDLE_TIME';
PROFILE LIMIT
------------------------------ ----------------------------------------
DEFAULT UNLIMITED
SQL> SELECT PROFILE FROM DBA_USERS WHERE USERNAME = USER;
PROFILE
------------------------------
DEFAULT
So the user I'm connected to has unlimited idle time - no time out.
Find where the cv2.so
is, for example /usr/local/lib/python2.7/dist-packages
, then add this into your ~/.bashrc
by doing:
sudo gedit ~/.bashrc
and add
export PYTHONPATH=/usr/local/lib/python2.7/dist-packages:$PYTHONPATH
In the last line
And then remember to open another terminal, this can be work, and I have solve my problem. Hope it can help you.
Based on the other answer by @Mechanical Snail, except without the use of python, which I found to be wildly overkill. Add this to your ~/.gitconfig
:
[github]
user = "your-name-here"
[alias]
hub-new-repo = "!REPO=$(basename $PWD) GHUSER=$(git config --get github.user); curl -u $GHUSER https://api.github.com/user/repos -d {\\\"name\\\":\\\"$REPO\\\"} --fail; git remote add origin [email protected]:$GHUSER/$REPO.git; git push origin master"
Mongoose 4.5 support this
Project.find(query)
.populate({
path: 'pages',
populate: {
path: 'components',
model: 'Component'
}
})
.exec(function(err, docs) {});
And you can join more than one deep level
you can also use good old sscanf.
CString s;
int i;
int j = _stscanf(s, _T("%d"), &i);
if (j != 1)
{
// tranfer didn't work
}
I had NestedScrollView inside ConstraintLayout, and this NestedScrollView has one ConstraintLayout.
If you're facing issue with NestedScrollView
,
add android:fillViewport="true"
to NestedScrollView, worked.
for followers, this error message can also mean "you have it referencing a foreign object that hasn't been saved to the DB yet" (even though it's there, and is non null).
Below query gives me the ids for which the supplied date range (start and end dates overlaps with any of the dates (start and end dates) in my table_name
select id from table_name where (START_DT_TM >= 'END_DATE_TIME' OR
(END_DT_TM BETWEEN 'START_DATE_TIME' AND 'END_DATE_TIME'))
It would be either of
A string in different languages including C sharp and PHP is also considered an array of characters.
Knowing that in theory array operations should be faster than string ones you could do,
$foo = "bar";
$lastChar = strlen($foo) -1;
echo $foo[$lastChar];
$firstChar = 0;
echo $foo[$firstChar];
However, standard array functions like
count();
will not work on a string.
To avoid saying everything Mark Ingram already said a little tip for using namespaces:
Avoid the "using namespace" directive in header files - this opens the namespace for all parts of the program which import this header file. In implementation files (*.cpp) this is normally no big problem - altough I prefer to use the "using namespace" directive on the function level.
I think namespaces are mostly used to avoid naming conflicts - not necessarily to organize your code structure. I'd organize C++ programs mainly with header files / the file structure.
Sometimes namespaces are used in bigger C++ projects to hide implementation details.
Additional note to the using directive: Some people prefer using "using" just for single elements:
using std::cout;
using std::endl;
Both solutions workto simulate printf, but in a different way. For instance, to convert a value to a hex string, you have the 2 following solutions:
with format()
, closest to sprintf()
:
final static String HexChars = "0123456789abcdef";
public static String getHexQuad(long v) {
String ret;
if(v > 0xffff) ret = getHexQuad(v >> 16); else ret = "";
ret += String.format("%c%c%c%c",
HexChars.charAt((int) ((v >> 12) & 0x0f)),
HexChars.charAt((int) ((v >> 8) & 0x0f)),
HexChars.charAt((int) ((v >> 4) & 0x0f)),
HexChars.charAt((int) ( v & 0x0f)));
return ret;
}
with replace(char oldchar , char newchar)
, somewhat faster but pretty limited:
...
ret += "ABCD".
replace('A', HexChars.charAt((int) ((v >> 12) & 0x0f))).
replace('B', HexChars.charAt((int) ((v >> 8) & 0x0f))).
replace('C', HexChars.charAt((int) ((v >> 4) & 0x0f))).
replace('D', HexChars.charAt((int) ( v & 0x0f)));
...
There is a third solution consisting of just adding the char to ret
one by one (char are numbers that add to each other!) such as in:
...
ret += HexChars.charAt((int) ((v >> 12) & 0x0f)));
ret += HexChars.charAt((int) ((v >> 8) & 0x0f)));
...
...but that'd be really ugly.
Use Time YYYYDDDD
(Year + Day of Year) as prefix. This decreases database fragmentation in tables and indexes. This method returns byte[40]
. I used it in a hybrid environment where the Active Directory SID (varbinary(85)
) is the key for LDAP users and an application auto-generated ID is used for non-LDAP Users. Also the large number of transactions per day in transactional tables (Banking Industry) cannot use standard Int
types for Keys
private static final DecimalFormat timeFormat4 = new DecimalFormat("0000;0000");
public static byte[] getSidWithCalendar() {
Calendar cal = Calendar.getInstance();
String val = String.valueOf(cal.get(Calendar.YEAR));
val += timeFormat4.format(cal.get(Calendar.DAY_OF_YEAR));
val += UUID.randomUUID().toString().replaceAll("-", "");
return val.getBytes();
}
In [56]: df = pd.DataFrame(np.abs(randn(3, 4)), index=[1,2,3], columns=['A','B','C','D'])
In [57]: df.divide(df.sum(axis=1), axis=0)
Out[57]:
A B C D
1 0.319124 0.296653 0.138206 0.246017
2 0.376994 0.326481 0.230464 0.066062
3 0.036134 0.192954 0.430341 0.340571
i used static array so that while returning array it should not throw error as you are returning address of local variable... so now you can send any locally created variable from function by making it as static...as it works as global variable....
#include<iostream>
using namespace std;
char *func(int n)
{
// char a[26]; /*if we use this then an error will occur because you are
// returning address of a local variable*/
static char a[26];
char temp='A';
for(int i=0;i<n;i++)
{
a[i]=temp;temp++;
}
return a;
}
int main()
{
int n=26;
char *p=func(n);
for(int i=0;i<n;i++)
cout<<*(p+i)<<" ";
//or you can also print like this
for(int i=0;i<n;i++)
cout<<p[i]<<" ";
}
$.get("/folder_name/filename.xml", function (xml) {_x000D_
var xmlInnerhtml = xml.documentElement.innerHTML;_x000D_
});
_x000D_
You can simply use the "includes" function as explained in this lesson on w3schools
it looks like
let myArray = ['Kevin', 'Bob', 'Stuart'];_x000D_
if( myArray.includes('Kevin'))_x000D_
console.log('Kevin is here');
_x000D_
I had the same problem.
Try renaming the files in assets folder with characters other than alphabets, numbers and underlines.
Specially, look for apostrophes and European alphabets not common in English.
The native DOM method does the right thing:
$('.cssbuttongo')[0].click();
^
Important!
This works regardless of whether the href
is a URL, a fragment (e.g. #blah
) or even a javascript:
.
Note that this calls the DOM click
method instead of the jQuery click
method (which is very incomplete and completely ignores href
).
I put the \let\cleardoublepage\clearpage
before \makeindex
. Else, your content page will display page number based on the page number before you clear the blank page.
To anyone interested in having there code work in Microsoft Edge, do not use defaults in function parameters.
function read_file(file, delete_after = false) {
#code
}
In that example Edge will throw an error "Expecting ')'"
To get around this use
function read_file(file, delete_after) {
if(delete_after == undefined)
{
delete_after = false;
}
#code
}
As of Aug 08 2016 this is still an issue
<Button Content="Click" Width="200" Height="50">
<Button.Style>
<Style TargetType="{x:Type Button}">
<Setter Property="Background" Value="LightBlue" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type Button}">
<Border x:Name="Border" Background="{TemplateBinding Background}">
<ContentPresenter HorizontalAlignment="Center" VerticalAlignment="Center" />
</Border>
<ControlTemplate.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter Property="Background" Value="LightGreen" TargetName="Border" />
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</Button.Style>
String id = UUID.randomUUID().toString();
See Android Developer blog article for using UUID class to get uuid
The issue was resolved by unchecking the
Properties > Build > Optimize Code
setting on the web page properties screen (under General).
Use http://www.proxomitron.info and set up the header you want, etc.
Deleting file .condarc (eg./root/.condarc) in the user's home directory before installation, resolved the issue.
You can use the .NET Path class:
[IO.Path]::Combine('C:\', 'Foo', 'Bar')
Given your Object:
var foo = { 'bar' : 'baz' }
To get bar
, use:
Object.keys(foo)[0]
To get baz
, use:
foo[Object.keys(foo)[0]]
Assuming a single object
I tried the above solutions but the following worked on me
export JAVA_HOME=/usr/java/default
A couple of gotchas that are colloraries to Andrew Shelansky's excellent answer and to disagree a little with doesn't really change the way that the compiler reads the code
Because your function prototypes are compiled as C, you can't have overloading of the same function names with different parameters - that's one of the key features of the name mangling of the compiler. It is described as a linkage issue but that is not quite true - you will get errors from both the compiler and the linker.
The compiler errors will be if you try to use C++ features of prototype declaration such as overloading.
The linker errors will occur later because your function will appear to not be found, if you do not have the extern "C" wrapper around declarations and the header is included in a mixture of C and C++ source.
One reason to discourage people from using the compile C as C++ setting is because this means their source code is no longer portable. That setting is a project setting and so if a .c file is dropped into another project, it will not be compiled as c++. I would rather people take the time to rename file suffixes to .cpp.
vector.clear()
should work for you. In case you want to shrink the capacity of the vector
along with clear then
std::vector<T>(v).swap(v);
A1 A2
Toronto<b> is nice =LEFT(A1,(FIND("<",A1,1)-1))
Not sure if the syntax is correct but the forumla in A2 will work for you,
This solution allows you to add space in-between the images as well. It combines the best parts of all the existing solutions and doesn't add any ugly table borders.
<p align="center">
<img alt="Light" src="https://...light.png" width="45%">
<img alt="Dark" src="https://...dark.png" width="45%">
</p>
The key is adding the
non-breaking space HTML entities, which you can add and remove in order to customize the spacing.
You can see this example live on GitHub here.
data attributes are commonly used for a variety of interactions. Typically via javascript. They do not affect anything regarding site behavior and stand as a convenient method to pass data for whatever purpose needed. Here is an article that may clear things up:
http://ejohn.org/blog/html-5-data-attributes/
You can create a data attribute by prefixing data-
to any standard attribute safe string (alphanumeric with no spaces or special characters). For example, data-id
or in this case data-reactid
You could just vectorize the function and then apply it directly to a Numpy array each time you need it:
import numpy as np
def f(x):
return x * x + 3 * x - 2 if x > 0 else x * 5 + 8
f = np.vectorize(f) # or use a different name if you want to keep the original f
result_array = f(A) # if A is your Numpy array
It's probably better to specify an explicit output type directly when vectorizing:
f = np.vectorize(f, otypes=[np.float])
"2) Can we use Dijksra’s algorithm for shortest paths for graphs with negative weights – one idea can be, calculate the minimum weight value, add a positive value (equal to absolute value of minimum weight value) to all weights and run the Dijksra’s algorithm for the modified graph. Will this algorithm work?"
This absolutely doesn't work unless all shortest paths have same length. For example given a shortest path of length two edges, and after adding absolute value to each edge, then the total path cost is increased by 2 * |max negative weight|. On the other hand another path of length three edges, so the path cost is increased by 3 * |max negative weight|. Hence, all distinct paths are increased by different amounts.
Try using the excellent Datejs JavaScript date library (the original is no longer maintained so you may be interested in this actively maintained fork instead):
Date.today().add(-30).days(); // or...
Date.today().add({days:-30});
[Edit]
See also the excellent Moment.js JavaScript date library:
moment().subtract(30, 'days'); // or...
moment().add(-30, 'days');
You can simply do
print 2*'hello'
I think Michal's answer is the best, but we can take it a step further and dynamically load an Android CSS as per the original question:
var isAndroid = /(android)/i.test(navigator.userAgent);
if (isAndroid) {
var css = document.createElement("link");
css.setAttribute("rel", "stylesheet");
css.setAttribute("type", "text/css");
css.setAttribute("href", "/css/android.css");
document.body.appendChild(css);
}
You could try to sort descending "sort LastWriteTime -Descending" and then "select -first 1." Not sure which one is faster
Documentation from npm for npm install <package-name> --save
and npm install <package-name> --save-dev
can be found here:
https://docs.npmjs.com/getting-started/using-a-package.json#the-save-and-save-dev-install-flags
A package.json
file declares metadata about the module you are developing. Both aforementioned commands modify this package.json
file. --save
will declare the installed package (in this case, grunt
) as a dependency for your module; --save-dev
will declare it as a dependency for development of your module.
Ask yourself: will the installed package be required for use of my module, or will it only be required for developing it?
Edit 2018-02-06: revision based on this comment
Edit: forgot to mention that this works on Python 2.7.x
There's multiprocesing.pool, and the following sample illustrates how to use one of them:
from multiprocessing.pool import ThreadPool as Pool
# from multiprocessing import Pool
pool_size = 5 # your "parallelness"
# define worker function before a Pool is instantiated
def worker(item):
try:
api.my_operation(item)
except:
print('error with item')
pool = Pool(pool_size)
for item in items:
pool.apply_async(worker, (item,))
pool.close()
pool.join()
Now if you indeed identify that your process is CPU bound as @abarnert mentioned, change ThreadPool to the process pool implementation (commented under ThreadPool import). You can find more details here: http://docs.python.org/2/library/multiprocessing.html#using-a-pool-of-workers
I'm also in favour of a ISO/IEC 11179 style naming convention, noting they are guidelines rather than being prescriptive.
See Data element name on Wikipedia:
"Tables are Collections of Entities, and follow Collection naming guidelines. Ideally, a collective name is used: eg., Personnel. Plural is also correct: Employees. Incorrect names include: Employee, tblEmployee, and EmployeeTable."
As always, there are exceptions to rules e.g. a table which always has exactly one row may be better with a singular name e.g. a config table. And consistency is of utmost importance: check whether you shop has a convention and, if so, follow it; if you don't like it then do a business case to have it changed rather than being the lone ranger.
You may enjoy package friendlyeval
which presents a simplified tidy eval API and documentation for newer/casual dplyr
users.
You are creating strings that you wish mutate
to treat as column names. So using friendlyeval
you could write:
multipetal <- function(df, n) {
varname <- paste("petal", n , sep=".")
df <- mutate(df, !!treat_string_as_col(varname) := Petal.Width * n)
df
}
for(i in 2:5) {
iris <- multipetal(df=iris, n=i)
}
Which under the hood calls rlang
functions that check varname
is legal as column name.
friendlyeval
code can be converted to equivalent plain tidy eval code at any time with an RStudio addin.
another example:
request:
curl -XGET http://127.0.0.1:5000/alert/dingding/test?x=y
then:
request.method: GET
request.url: http://127.0.0.1:5000/alert/dingding/test?x=y
request.base_url: http://127.0.0.1:5000/alert/dingding/test
request.url_charset: utf-8
request.url_root: http://127.0.0.1:5000/
str(request.url_rule): /alert/dingding/test
request.host_url: http://127.0.0.1:5000/
request.host: 127.0.0.1:5000
request.script_root:
request.path: /alert/dingding/test
request.full_path: /alert/dingding/test?x=y
request.args: ImmutableMultiDict([('x', 'y')])
request.args.get('x'): y
If you encounter this error in SourceTree, go to Actions>Resolve Conflicts>Restart Merge.
SourceTree version used is 1.6.14.0
I created a gif for explain this, hope to be helpful: look, line 3 is asynchronous and others are synchronous. all lines before line 3 should wait until before line finish its work, but because of line 3 is asynchronous, next line (line 4), don't wait for line 3, but line 5 should wait for line 4 to finish its work, and line 6 should wait for line 5 and 7 for 6, because line 4,5,6,7 are not asynchronous.
Run this code, it will fetch data from file and display in console
function fileread(filename)
{
var contents= fs.readFileSync(filename);
return contents;
}
var fs =require("fs"); // file system
var data= fileread("abc.txt");
//module.exports.say =say;
//data.say();
console.log(data.toString());
You can use
adb shell ps | grep apps | awk '{print $9}'
to produce an output like:
com.google.process.gapps
com.google.android.apps.uploader
com.google.android.apps.plus
com.google.android.apps.maps
com.google.android.apps.maps:GoogleLocationService
com.google.android.apps.maps:FriendService
com.google.android.apps.maps:LocationFriendService
adb shell ps returns a list of all running processes on the android device, grep apps searches for any row with contains "apps", as you can see above they are all com.google.android.APPS. or GAPPS, awk extracts the 9th column which in this case is the package name.
To search for a particular package use
adb shell ps | grep PACKAGE.NAME.HERE | awk '{print $9}'
i.e adb shell ps | grep com.we7.player | awk '{print $9}'
If it is running the name will appear, if not there will be no result returned.
Creating Tags
Git uses two main types of tags: lightweight and annotated.
Annotated Tags:
To create an annotated tag in Git you can just run the following simple commands on your terminal.
$ git tag -a v2.1.0 -m "xyz feature is released in this tag."
$ git tag
v1.0.0
v2.0.0
v2.1.0
The -m denotes message for that particular tag. We can write summary of features which is going to tag here.
Lightweight Tags:
The other way to tag commits is lightweight tag. We can do it in the following way:
$ git tag v2.1.0
$ git tag
v1.0.0
v2.0.0
v2.1.0
Push Tag
To push particular tag you can use below command:
git push origin v1.0.3
Or if you want to push all tags then use the below command:
git push --tags
List all tags:
To list all tags, use the following command.
git tag
InstanceID.getInstance(getApplicationContext()).getToken(authorizedEntity,scope)
authorizedEntity is the project number of the server
Your variable declarations and their scope are correct. The problem you are facing is that the first AJAX request may take a little bit time to finish. Therefore, the second URL will be filled with the value of sID
before the its content has been set. You have to remember that AJAX request are normally asynchronous, i.e. the code execution goes on while the data is being fetched in the background.
You have to nest the requests:
$.getJSON("https://prod.api.pvp.net/api/lol/eune/v1.1/summoner/by-name/"+input+"?api_key=API_KEY_HERE" , function(name){ obj = name; // sID is only now available! sID = obj.id; console.log(sID); });
name.id
is sufficient unless you really need the other variables outside the function.$.getJSON("https://prod.api.pvp.net/api/lol/eune/v1.1/summoner/by-name/"+input+"?api_key=API_KEY_HERE" , function(name){ // We don't need sID or obj here - name.id is sufficient console.log(name.id); doSecondRequest(name.id); }); /// TODO Choose a better name function doSecondRequest(sID) { $.getJSON("https://prod.api.pvp.net/api/lol/eune/v1.2/stats/by-summoner/" + sID + "/summary?api_key=API_KEY_HERE", function(stats){ console.log(stats); }); }
Hapy New Year :)
I'm Daniel Stenberg.
I founded the curl project back in 1998, I wrote the initial curl version and I created libcurl. I've written more than half of all the 24,000 commits done in the source code repository up to this point in time. I'm still the lead developer of the project. To a large extent, curl is my baby.
I shipped the first version of curl as open source since I wanted to "give back" to the open source world that had given me so much code already. I had used so much open source and I wanted to be as cool as the other open source authors.
Thanks to it being open source, literally thousands of people have been able to help us out over the years and have improved the products, the documentation. the web site and just about every other detail around the project. curl and libcurl would never have become the products that they are today were they not open source. The list of contributors now surpass 1900 names and currently the list grows with a few hundred names per year.
Thanks to curl and libcurl being open source and liberally licensed, they were immediately adopted in numerous products and soon shipped by operating systems and Linux distributions everywhere thus getting a reach beyond imagination.
Thanks to them being "everywhere", available and liberally licensed they got adopted and used everywhere and by everyone. It created a defacto transfer library standard.
At an estimated six billion installations world wide, we can safely say that curl is the most widely used internet transfer library in the world. It simply would not have gone there had it not been open source. curl runs in billions of mobile phones, a billion Windows 10 installations, in a half a billion games and several hundred million TVs - and more.
Should I have released it with proprietary license instead and charged users for it? It never occured to me, and it wouldn't have worked because I would never had managed to create this kind of stellar project on my own. And projects and companies wouldn't have used it.
Now, why do I and my fellow curl developers still continue to develop curl and give it away for free to the world?
Yes. So insanely much.
But I'm not satisfied with this and I'm not just leaning back, happy with what we've done. I keep working on curl every single day, to improve, to fix bugs, to add features and to make sure curl keeps being the number one file transfer solution for the world even going forward.
We do mistakes along the way. We make the wrong decisions and sometimes we implement things in crazy ways. But to win in the end and to conquer the world is about patience and endurance and constantly going back and reconsidering previous decisions and correcting previous mistakes. To continuously iterate, polish off rough edges and gradually improve over time.
Never give in. Never stop. Fix bugs. Add features. Iterate. To the end of time.
Yeah. For real.
Sure I get tired at times. Working on something every day for over twenty years isn't a paved downhill road. Sometimes there are obstacles. During times things are rough. Occasionally people are just as ugly and annoying as people can be.
But curl is my life's project and I have patience. I have thick skin and I don't give up easily. The tough times pass and most days are awesome. I get to hang out with awesome people and the reward is knowing that my code helps driving the Internet revolution everywhere is an ego boost above normal.
curl will never be "done" and so far I think work on curl is pretty much the most fun I can imagine. Yes, I still think so even after twenty years in the driver's seat. And as long as I think it's fun I intend to keep at it.
I know this question has been answered 3 years ago, but this may be what your were looking for.
Google has released a couple of weeks ago a library allowing easy and flexible dynamic object allocations. Here it is: http://google-opensource.blogspot.fr/2014/01/introducing-infact-library.html
The following code works fine for me, using the StreamReader
class:
using (var reader = new StreamReader(fileName, defaultEncodingIfNoBom, true))
{
reader.Peek(); // you need this!
var encoding = reader.CurrentEncoding;
}
The trick is to use the Peek
call, otherwise, .NET has not done anything (and it hasn't read the preamble, the BOM). Of course, if you use any other ReadXXX
call before checking the encoding, it works too.
If the file has no BOM, then the defaultEncodingIfNoBom
encoding will be used. There is also a StreamReader without this overload method (in this case, the Default (ANSI) encoding will be used as defaultEncodingIfNoBom), but I recommand to define what you consider the default encoding in your context.
I have tested this successfully with files with BOM for UTF8, UTF16/Unicode (LE & BE) and UTF32 (LE & BE). It does not work for UTF7.
You already have what you need, with a minor syntax change:
<a href="www.mysite.com" onclick="return theFunction();">Item</a>
<script type="text/javascript">
function theFunction () {
// return true or false, depending on whether you want to allow the `href` property to follow through or not
}
</script>
The default behavior of the <a>
tag's onclick
and href
properties is to execute the onclick
, then follow the href
as long as the onclick
doesn't return false
, canceling the event (or the event hasn't been prevented)
Add android:gravity="right"
to LinearLayout. Assuming the TextView
has layout_width="wrap_content"
Checkout this, This is from PHP MANUAL, This may help you.
If you're using PHP_CLI SAPI and getting error "Maximum execution time of N seconds exceeded" where N is an integer value, try to call set_time_limit(0) every M seconds or every iteration. For example:
<?php
require_once('db.php');
$stmt = $db->query($sql);
while ($row = $stmt->fetchRow()) {
set_time_limit(0);
// your code here
}
?>
In addition to DESCRIBE TABLE
, you can use the command below
DESCRIBE INDEXES FOR TABLE *tablename* SHOW DETAIL
to get information about the table's indexes.
The most comprehensive detail about a table on Db2 for Linux, UNIX, and Windows can be obtained from the db2look utility, which you can run from a remote client or directly on the Db2 server as a local user. The tool produces the DDL and other information necessary to mimic tables and their statistical data. The docs for db2look in Db2 11.5 are here.
The following db2look
command will connect to the SALESDB database and obtain the DDL statements necessary to recreate the ORDERS table
db2look -d SALESDB -e -t ORDERS
This error message just helped me a bunch, as I hadn't realized that I'd accidentally written my function using my testing example player
my_player.attributes[item]
instead of the correct way
self.attributes[item]
Using the is
or as
operators is the correct way if you know the interface type at compile time and have an instance of the type you are testing. Something that no one else seems to have mentioned is Type.IsAssignableFrom
:
if( typeof(IMyInterface).IsAssignableFrom(someOtherType) )
{
}
I think this is much neater than looking through the array returned by GetInterfaces
and has the advantage of working for classes as well.
install the package needed. if you use yum:
yum search pgsql
then look at the result and find anything that is something like 'php-pgsql' or something like that. copy the name and then:
yum install *paste the name of the package here*
this fails:
DECLARE @vPortalUID NVARCHAR(32)
SET @vPortalUID='2A66057D-F4E5-4E2B-B2F1-38C51A96D385'
DECLARE @nPortalUID AS UNIQUEIDENTIFIER
SET @nPortalUID = CAST(@vPortalUID AS uniqueidentifier)
PRINT @nPortalUID
this works
DECLARE @vPortalUID NVARCHAR(36)
SET @vPortalUID='2A66057D-F4E5-4E2B-B2F1-38C51A96D385'
DECLARE @nPortalUID AS UNIQUEIDENTIFIER
SET @nPortalUID = CAST(@vPortalUID AS UNIQUEIDENTIFIER)
PRINT @nPortalUID
the difference is NVARCHAR(36)
, your input parameter is too small!
Open studio.vmoptions and change JVM options
studio.vmoptions locates at /Applications/Android\ Studio.app/bin/studio.vmoptions (Mac OS). In my machine, it looks like
-Xms128m
-Xmx800m
-XX:MaxPermSize=350m
-XX:ReservedCodeCacheSize=64m
-XX:+UseCodeCacheFlushing
-XX:+UseCompressedOops
Change to
-Xms256m
-Xmx1024m
-XX:MaxPermSize=350m
-XX:ReservedCodeCacheSize=64m
-XX:+UseCodeCacheFlushing
-XX:+UseCompressedOops
And restart Android Studio
See more Android Studio website
You can simply use the setdiff
function to get the packages that aren't installed and then install them. In the sample below, we check if the ggplot2
and Rcpp
packages are installed before installing them.
unavailable <- setdiff(c("ggplot2", "Rcpp"), rownames(installed.packages()))
install.packages(unavailable)
In one line, the above can be written as:
install.packages(setdiff(c("ggplot2", "Rcpp"), rownames(installed.packages())))
Nothing is impossible. Use the force.
.parent {
position: relative;
}
.child {
position: absolute;
top:0;
left: 0;
right: 0;
bottom: 0;
z-index: 100;
}
For Brazilian ABNT Keyboards you do Ctrl + ; to comment and repeat it to remove the comment.
To do this with a generic view, like CreateView...
class AddPhotoToProject(CreateView):
"""
a view where a user can associate a photo with a project
"""
model = Connection
form_class = CreateConnectionForm
def get_context_data(self, **kwargs):
context = super(AddPhotoToProject, self).get_context_data(**kwargs)
context['photo'] = self.kwargs['pk']
context['form'].fields['project'].queryset = Project.objects.for_user(self.request.user)
return context
def form_valid(self, form):
pobj = Photo.objects.get(pk=self.kwargs['pk'])
obj = form.save(commit=False)
obj.photo = pobj
obj.save()
return_json = {'success': True}
if self.request.is_ajax():
final_response = json.dumps(return_json)
return HttpResponse(final_response)
else:
messages.success(self.request, 'photo was added to project!')
return HttpResponseRedirect(reverse('MyPhotos'))
the most important part of that...
context['form'].fields['project'].queryset = Project.objects.for_user(self.request.user)
The oracle tag was not on the question when this answer was offered, and apparently it doesn't work with oracle, but it does work with at least postgres and mysql
No, just use the value directly:
begin
if (select count(*) from table) > 0 then
update table
end if;
end;
Note there is no need for an "else".
You can simply do it all within the update statement (ie no if
construct):
update table
set ...
where ...
and exists (select 'x' from table where ...)
This should help :
https://www.w3schools.com/tags/att_select_required.asp
<form>_x000D_
<select required>_x000D_
<option value="">None</option>_x000D_
<option value="volvo">Volvo</option>_x000D_
<option value="saab">Saab</option>_x000D_
<option value="mercedes">Mercedes</option>_x000D_
<option value="audi">Audi</option>_x000D_
</select>_x000D_
<button type="submit">Submit</button>_x000D_
</form>
_x000D_
Here is what I find works
form name
Use a default select option
, for example...
<option value="-1" selected>Please Select</option>
So that if the form is submitted, use of JavaScript to halt the submission process can be implemented and verified at the server too.
This input
<input type="submit">
should be
<input name="Submit" type="submit" value="Submit">
whenever I use a form that fails, it is a failure due to the difference in calling the button name submit
and name as Submit
.
You should also set your enctype attribute for your form as forms fail on my web host if it's not set.
You'll need to reload the table on the UI
thread via:
//swift 2.3
dispatch_async(dispatch_get_main_queue(), { () -> Void in
self.tableView.reloadData()
})
//swift 5
DispatchQueue.main.async{
self.tableView.reloadData()
}
Follow up:
An easier alternative to the connection.start()
approach is to instead use NSURLConnection.sendAsynchronousRequest(...)
//NSOperationQueue.mainQueue() is the main thread
NSURLConnection.sendAsynchronousRequest(NSURLRequest(URL: url), queue: NSOperationQueue.mainQueue()) { (response, data, error) -> Void in
//check error
var jsonError: NSError?
let json: AnyObject? = NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.allZeros, error: &jsonError)
//check jsonError
self.collectionView?.reloadData()
}
This doesn't allow you the flexibility of tracking the bytes though, for example you might want to calculate the progress of the download via bytesDownloaded/bytesNeeded
Type "ctor" and press the TAB key twice this will add the default constructor automatically
Automatically not split data to multi pages. You may split manually.
If your ( rowCount * rowHeight ) > 420mm ( A3 Height in mm ) add new page function. ( Sorry I can't edit your code without run ) After add new page leftMargin, topMargin = 0; ( start over ) I added sample code with yours. I hope it's right.
else {
doc.margins = 1;
doc.setFont("Times ");
doc.setFontType("normal ");
doc.setFontSize(11);
if ( rowCount * rowHeight > 420 ) {
doc.addPage();
rowCount = 3; // skip 1 and 2 above
} else {
// now rowcount = 3 ( top of new page for 3 )
// j is your x axis cell index ( j start from 0 on $.each function ) or you can add cellCount like rowCount and replace with
// rowcount is your y axis cell index
left = ( ( j ) * ( cellWidth + leftMargin );
top = ( ( rowcount - 3 ) * ( rowHeight + topMargin );
doc.cell( leftMargin, top, cellWidth, rowHeight, cellContent, i);
// 1st=left margin 2nd parameter=top margin, 3rd=row cell width 4th=Row height
}
}
You can convert html directly to pdf lossless. Youtube video for html => pdf example
Just remember to add quotes into the path if you have a space in your path to java home. C:\Program Files\java\javaxxx\ doesn't work but "C:\Program Files\java\javaxxx\" does.
"A script is what you give the actors. A program is what you give the audience." -- Larry Wall
I really don't think there's much of a difference any more. The so-called "scripting" languages are often compiled -- just very quickly, and at runtime. And some of the "programming" languages are are further compiled at runtime as well (think of JIT) and the first stage of "compiling" is syntax checking and resource resolution.
Don't get hung up on it, it's really not important.
old question with many answers, but I found that none were quite clear enough for me, so I would like to add my try.
if you have the following structure
/home/ftp/mysite/
with following file/folders
/home/ftp/mysite/file1
/home/ftp/mysite/file2
/home/ftp/mysite/file3
/home/ftp/mysite/folder1
/home/ftp/mysite/folder2
/home/ftp/mysite/folder3
so, you want to make a tar file that contain everyting inside /home/ftp/mysite (to move the site to a new server), but file3
is just junk, and everything in folder3
is also not needed, so we will skip those two.
we use the format
tar -czvf <name of tar file> <what to tar> <any excludes>
where the c = create, z = zip, and v = verbose (you can see the files as they are entered, usefull to make sure none of the files you exclude are being added). and f= file.
so, my command would look like this
cd /home/ftp/
tar -czvf mysite.tar.gz mysite --exclude='file3' --exclude='folder3'
note the files/folders excluded are relatively to the root of your tar (I have tried full path here relative to / but I can not make that work).
hope this will help someone (and me next time I google it)
Got into the same predicament. I ended up with the following. So here I am not injecting the scope object into the factory, but setting the $scope in the controller itself using the concept of promise returned by $http service.
(function () {
getDataFactory = function ($http)
{
return {
callWebApi: function (reqData)
{
var dataTemp = {
Page: 1, Take: 10,
PropName: 'Id', SortOrder: 'Asc'
};
return $http({
method: 'GET',
url: '/api/PatientCategoryApi/PatCat',
params: dataTemp, // Parameters to pass to external service
headers: { 'Content-Type': 'application/Json' }
})
}
}
}
patientCategoryController = function ($scope, getDataFactory) {
alert('Hare');
var promise = getDataFactory.callWebApi('someDataToPass');
promise.then(
function successCallback(response) {
alert(JSON.stringify(response.data));
// Set this response data to scope to use it in UI
$scope.gridOptions.data = response.data.Collection;
}, function errorCallback(response) {
alert('Some problem while fetching data!!');
});
}
patientCategoryController.$inject = ['$scope', 'getDataFactory'];
getDataFactory.$inject = ['$http'];
angular.module('demoApp', []);
angular.module('demoApp').controller('patientCategoryController', patientCategoryController);
angular.module('demoApp').factory('getDataFactory', getDataFactory);
}());
When the local git projects are cloned in eclipse and are viewable in git
perspective but not in package explorer
(workspace), the following steps worked for me:
git
perspectiveimport projects
A big part of the REST philosophy is to exploit as many standard features of the HTTP protocol as possible when designing your API. Applying that philosophy to authentication, client and server would utilize standard HTTP authentication features in the API.
Login screens are great for human user use cases: visit a login screen, provide user/password, set a cookie, client provides that cookie in all future requests. Humans using web browsers can't be expected to provide a user id and password with each individual HTTP request.
But for a REST API, a login screen and session cookies are not strictly necessary, since each request can include credentials without impacting a human user; and if the client does not cooperate at any time, a 401
"unauthorized" response can be given. RFC 2617 describes authentication support in HTTP.
TLS (HTTPS) would also be an option, and would allow authentication of the client to the server (and vice versa) in every request by verifying the public key of the other party. Additionally this secures the channel for a bonus. Of course, a keypair exchange prior to communication is necessary to do this. (Note, this is specifically about identifying/authenticating the user with TLS. Securing the channel by using TLS / Diffie-Hellman is always a good idea, even if you don't identify the user by its public key.)
An example: suppose that an OAuth token is your complete login credentials. Once the client has the OAuth token, it could be provided as the user id in standard HTTP authentication with each request. The server could verify the token on first use and cache the result of the check with a time-to-live that gets renewed with each request. Any request requiring authentication returns 401
if not provided.
You could always switch out the first and third examples with a while loop and a little more code. This gives you the advantage of being able to use the do-while:
int i = 0;
do{
E element = list.get(i);
i++;
}
while (i < list.size());
Of course, this kind of thing might cause a NullPointerException if the list.size() returns 0, becuase it always gets executed at least once. This can be fixed by testing if element is null before using its attributes / methods tho. Still, it's a lot simpler and easier to use the for loop
A couple of more options :
With asplit
asplit(xy.df, 1)
#[[1]]
# x y
#0.1137 0.6936
#[[2]]
# x y
#0.6223 0.5450
#[[3]]
# x y
#0.6093 0.2827
#....
With split
and row
split(xy.df, row(xy.df)[, 1])
#$`1`
# x y
#1 0.1137 0.6936
#$`2`
# x y
#2 0.6223 0.545
#$`3`
# x y
#3 0.6093 0.2827
#....
data
set.seed(1234)
xy.df <- data.frame(x = runif(10), y = runif(10))
If you have arrived at this question because IntelliSense has stopped working properly and you are hoping to force it to show you what you need, then most likely none of these solutions are going to work.
Closing and restarting Visual Studio should fix the problem.
Same result you can achieve using the Splitter class.
var list = Splitter.on(",").splitToList(YourStringVariable)
(written in kotlin)
I had a similar problem (detailed explanation below), and I solved it (in jasmine-core: 2.52
) by using the tick
function with the same (or greater) amount of milliseconds as in original setTimeout
call.
For example, if I had a setTimeout(() => {...}, 2500);
(so it will trigger after 2500 ms), I would call tick(2500)
, and that would solve the problem.
What I had in my component, as a reaction on a Delete button click:
delete() {
this.myService.delete(this.id)
.subscribe(
response => {
this.message = 'Successfully deleted! Redirecting...';
setTimeout(() => {
this.router.navigate(['/home']);
}, 2500); // I wait for 2.5 seconds before redirect
});
}
Her is my working test:
it('should delete the entity', fakeAsync(() => {
component.id = 1; // preparations..
component.getEntity(); // this one loads up the entity to my component
tick(); // make sure that everything that is async is resolved/completed
expect(myService.getMyThing).toHaveBeenCalledWith(1);
// more expects here..
fixture.detectChanges();
tick();
fixture.detectChanges();
const deleteButton = fixture.debugElement.query(By.css('.btn-danger')).nativeElement;
deleteButton.click(); // I've clicked the button, and now the delete function is called...
tick(2501); // timeout for redirect is 2500 ms :) <-- solution
expect(myService.delete).toHaveBeenCalledWith(1);
// more expects here..
}));
P.S. Great explanation on fakeAsync
and general asyncs in testing can be found here: a video on Testing strategies with Angular 2 - Julie Ralph, starting from 8:10, lasting 4 minutes :)
here's how you can do it with a cool shell trick:
mysql -uroot -p -hslavedb.mydomain.com mydb_production <<< 'select * from users'
'<<<' instructs the shell to take whatever follows it as stdin, similar to piping from echo.
use the -t flag to enable table-format output
That should do it:
Date a = ...;
Date b = ...;
Math.abs(a.getTime()-b.getTime())/1000;
Here the relevant documentation: Date.getTime(). Be aware that this will only work for dates after January 1, 1970, 00:00:00 GMT
I had to do this on CentOS 5.8. Running bundle install
kept causing issues since I couldn't force it to use a particular PG version.
I can't yum erase postgresql postgresql-devel
either, because of dependency issues (it would remove php, http etc)
The solution? Mess $PATH temporarily to give preference to the update pgsql instead of the default one:
export PATH=/usr/pgsql-9.2/bin:$PATH
bundle install
Basically, with the above commands, it will look at /usr/pgsql-9.2/bin/pg_config
before the one in /usr/bin/pg_config
My solution is to use m4. It's supported on most platforms and is included in the binutils package.
First include a macro changequote()
in the file to change the quoting characters to what you prefer (default is `'). The macro is removed when the file is processed.
changequote(`{{', `}}')
include({{other_file}})
On the commandline:
m4 -I./dir_containing_other_file/ input.md > _tmp.md
pandoc -o output.html _tmp.md
You can use the new Bootstrap cards:
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/css/bootstrap.min.css" integrity="sha384-rwoIResjU2yc3z8GV/NPeZWAv56rSmLldC3R/AZzGRnGxQQKnKkoFVhFQhNUwEyJ" crossorigin="anonymous">_x000D_
<script src="https://code.jquery.com/jquery-3.1.1.slim.min.js" integrity="sha384-A7FZj7v+d/sdmMqp/nOQwliLvUsJfDHW+k9Omg/a/EheAdgtzNs3hpfag6Ed950n" crossorigin="anonymous"></script>_x000D_
<script src="https://cdnjs.cloudflare.com/ajax/libs/tether/1.4.0/js/tether.min.js" integrity="sha384-DztdAPBWPRXSA/3eYEEUWrWCy7G5KFbe8fFjk5JAIxUYHKkDx6Qin1DkWx51bBrb" crossorigin="anonymous"></script>_x000D_
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Link: Click here
regards,
You can use step-down as I describe in the links you refer to but you appear to use them in a wrong way.
Step down is not needed to scale images to ratios above 1:2 (typically, but not limited to). It is where you need to do a drastic down-scaling you need to split it up in two (and rarely, more) steps depending on content of the image (in particular where high-frequencies such as thin lines occur).
Every time you down-sample an image you will loose details and information. You cannot expect the resulting image to be as clear as the original.
If you are then scaling down the images in many steps you will loose a lot of information in total and the result will be poor as you already noticed.
Try with just one extra step, or at tops two.
In case of Photoshop notice that it applies a convolution after the image has been re-sampled, such as sharpen. It's not just bi-cubic interpolation that takes place so in order to fully emulate Photoshop we need to also add the steps Photoshop is doing (with the default setup).
For this example I will use my original answer that you refer to in your post, but I have added a sharpen convolution to it to improve quality as a post process (see demo at bottom).
Here is code for adding sharpen filter (it's based on a generic convolution filter - I put the weight matrix for sharpen inside it as well as a mix factor to adjust the pronunciation of the effect):
Usage:
sharpen(context, width, height, mixFactor);
The mixFactor
is a value between [0.0, 1.0] and allow you do downplay the sharpen effect - rule-of-thumb: the less size the less of the effect is needed.
Function (based on this snippet):
function sharpen(ctx, w, h, mix) {
var weights = [0, -1, 0, -1, 5, -1, 0, -1, 0],
katet = Math.round(Math.sqrt(weights.length)),
half = (katet * 0.5) |0,
dstData = ctx.createImageData(w, h),
dstBuff = dstData.data,
srcBuff = ctx.getImageData(0, 0, w, h).data,
y = h;
while(y--) {
x = w;
while(x--) {
var sy = y,
sx = x,
dstOff = (y * w + x) * 4,
r = 0, g = 0, b = 0, a = 0;
for (var cy = 0; cy < katet; cy++) {
for (var cx = 0; cx < katet; cx++) {
var scy = sy + cy - half;
var scx = sx + cx - half;
if (scy >= 0 && scy < h && scx >= 0 && scx < w) {
var srcOff = (scy * w + scx) * 4;
var wt = weights[cy * katet + cx];
r += srcBuff[srcOff] * wt;
g += srcBuff[srcOff + 1] * wt;
b += srcBuff[srcOff + 2] * wt;
a += srcBuff[srcOff + 3] * wt;
}
}
}
dstBuff[dstOff] = r * mix + srcBuff[dstOff] * (1 - mix);
dstBuff[dstOff + 1] = g * mix + srcBuff[dstOff + 1] * (1 - mix);
dstBuff[dstOff + 2] = b * mix + srcBuff[dstOff + 2] * (1 - mix)
dstBuff[dstOff + 3] = srcBuff[dstOff + 3];
}
}
ctx.putImageData(dstData, 0, 0);
}
The result of using this combination will be:
Depending on how much of the sharpening you want to add to the blend you can get result from default "blurry" to very sharp:
If you want to get the best result quality-wise you'll need to go low-level and consider to implement for example this brand new algorithm to do this.
See Interpolation-Dependent Image Downsampling (2011) from IEEE.
Here is a link to the paper in full (PDF).
There are no implementations of this algorithm in JavaScript AFAIK of at this time so you're in for a hand-full if you want to throw yourself at this task.
The essence is (excerpts from the paper):
Abstract
An interpolation oriented adaptive down-sampling algorithm is proposed for low bit-rate image coding in this paper. Given an image, the proposed algorithm is able to obtain a low resolution image, from which a high quality image with the same resolution as the input image can be interpolated. Different from the traditional down-sampling algorithms, which are independent from the interpolation process, the proposed down-sampling algorithm hinges the down-sampling to the interpolation process. Consequently, the proposed down-sampling algorithm is able to maintain the original information of the input image to the largest extent. The down-sampled image is then fed into JPEG. A total variation (TV) based post processing is then applied to the decompressed low resolution image. Ultimately, the processed image is interpolated to maintain the original resolution of the input image. Experimental results verify that utilizing the downsampled image by the proposed algorithm, an interpolated image with much higher quality can be achieved. Besides, the proposed algorithm is able to achieve superior performance than JPEG for low bit rate image coding.
(see provided link for all details, formulas etc.)
Not exactly with HTML5 validation but a little JavaScript can resolve the issue, follow the example below:
<p>Password:</p>
<input name="password" required="required" type="password" id="password" />
<p>Confirm Password:</p>
<input name="password_confirm" required="required" type="password" id="password_confirm" oninput="check(this)" />
<script language='javascript' type='text/javascript'>
function check(input) {
if (input.value != document.getElementById('password').value) {
input.setCustomValidity('Password Must be Matching.');
} else {
// input is valid -- reset the error message
input.setCustomValidity('');
}
}
</script>
<br /><br />
<input type="submit" />
@Navaneeth and @Antfish, no need to transform you can do like this also because in above solution only top border is visible so for inside curve you can use bottom border.
.box {_x000D_
width: 500px;_x000D_
height: 100px;_x000D_
border: solid 5px #000;_x000D_
border-color: transparent transparent #000 transparent;_x000D_
border-radius: 0 0 240px 50%/60px;_x000D_
}
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<div class="box"></div>
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First remove old version, then run literally the following:
npm install [email protected]
and for stable or recent
npm install -g npm@latest // For the last stable version
npm install -g npm@next // For the most recent release
There is this great package
Package: https://pypi.python.org/pypi/multiprocessing-logging/
code: https://github.com/jruere/multiprocessing-logging
Install:
pip install multiprocessing-logging
Then add:
import multiprocessing_logging
# This enables logs inside process
multiprocessing_logging.install_mp_handler()
This is my working variant for Laravel 7
DB::table('user')
->select('id','name')
->whereNotIn('id', DB::table('curses')->where('id_user', $id)->pluck('id_user')->toArray())
->get();
In Crockford's JavaScript The Good Parts, there is a function to check if the given argument is an array:
var is_array = function (value) {
return value &&
typeof value === 'object' &&
typeof value.length === 'number' &&
typeof value.splice === 'function' &&
!(value.propertyIsEnumerable('length'));
};
He explains:
First, we ask if the value is truthy. We do this to reject null and other falsy values. Second, we ask if the typeof value is 'object'. This will be true for objects, arrays, and (weirdly) null. Third, we ask if the value has a length property that is a number. This will always be true for arrays, but usually not for objects. Fourth, we ask if the value contains a splice method. This again will be true for all arrays. Finally, we ask if the length property is enumerable (will length be produced by a for in loop?). That will be false for all arrays. This is the most reliable test for arrayness that I have found. It is unfortunate that it is so complicated.
You will not write code into a static block that needs to be invoked anywhere in your program. If the purpose of the code is to be invoked then you must place it in a method.
You can write static initializer blocks to initialize static variables when the class is loaded but this code can be more complex..
A static initializer block looks like a method with no name, no arguments, and no return type. Since you never call it it doesn't need a name. The only time its called is when the virtual machine loads the class.
The following will parse an XML string into an XML document in all major browsers, including Internet Explorer 6. Once you have that, you can use the usual DOM traversal methods/properties such as childNodes and getElementsByTagName() to get the nodes you want.
var parseXml;
if (typeof window.DOMParser != "undefined") {
parseXml = function(xmlStr) {
return ( new window.DOMParser() ).parseFromString(xmlStr, "text/xml");
};
} else if (typeof window.ActiveXObject != "undefined" &&
new window.ActiveXObject("Microsoft.XMLDOM")) {
parseXml = function(xmlStr) {
var xmlDoc = new window.ActiveXObject("Microsoft.XMLDOM");
xmlDoc.async = "false";
xmlDoc.loadXML(xmlStr);
return xmlDoc;
};
} else {
throw new Error("No XML parser found");
}
Example usage:
var xml = parseXml("<foo>Stuff</foo>");
alert(xml.documentElement.nodeName);
Which I got from https://stackoverflow.com/a/8412989/1232175.
Bitmap scaledBitmap = scaleDown(realImage, MAX_IMAGE_SIZE, true);
Scale down method:
public static Bitmap scaleDown(Bitmap realImage, float maxImageSize,
boolean filter) {
float ratio = Math.min(
(float) maxImageSize / realImage.getWidth(),
(float) maxImageSize / realImage.getHeight());
int width = Math.round((float) ratio * realImage.getWidth());
int height = Math.round((float) ratio * realImage.getHeight());
Bitmap newBitmap = Bitmap.createScaledBitmap(realImage, width,
height, filter);
return newBitmap;
}