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Capture HTML Canvas as gif/jpg/png/pdf?
...me type (png is the only one that must be supported). If you would like an array of the supported types you can do something along the lines of this:
var imageMimes = ['image/png', 'image/bmp', 'image/gif', 'image/jpeg', 'image/tiff']; //Extend as necessary
var acceptedMimes = new Array();
for(i =...
What is the right way to check for a null string in Objective-C?
...that can be used as a stand in for nil when nil cannot be used (eg in an NSArray or NSDictionary value). So a use case might be where you had an NSArray of optional strings, some of which might be null, and you use [NSNull null] in the array for the null cases. In practice, the test is rarely neede...
What is the difference between mutex and critical section?
...aneously and a function called "critical_section_function" which updates a array... you don't want all 5 threads updating the array at once. So when the program is running critical_section_function(), none of the other threads must run their critical_section_function.
mutex*
Mutex is a way of impl...
Can someone explain the “debounce” function in Javascript
...s passed to a function
accessible inside of the function in an array-like variable
named `arguments`. Assinging `arguments` to `args` combines
all arguments passed in the `func` argument of our `debounce`
method in a single variable.
*/
...
OceanBase使用libeasy原理源码分析：客户端 - 数据库(内核) - 清泛网 - 专...
...on，并且没有现成的到对端的connection，则从IO线程的client_array(easy_array_t)中拿一个空闲的easy_client_t槽位，然后初始化它，并将其加入到IO线程的client_list中，再调用easy_connection_do_connect建立到对端的连接，最后返回该连接。如果是...
Concatenate two string literals
...ate two string literals using +, it is because a string literal is just an array of characters (a const char [N] where N is the length of the string plus one, for the null terminator). When you use an array in most contexts, it is converted into a pointer to its initial element.
So, when you try...
Why is there no Char.Empty like String.Empty?
...
Isn't the \0 the 'end of the byte array'-character? Or am I confusing with something else?
– Bertvan
Sep 8 '10 at 17:47
5
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How do I query using fields inside the new PostgreSQL JSON datatype?
...The answer to the original question in Postgres 9.3:
SELECT *
FROM json_array_elements(
'[{"name": "Toby", "occupation": "Software Engineer"},
{"name": "Zaphod", "occupation": "Galactic President"} ]'
) AS elem
WHERE elem->>'name' = 'Toby';
Advanced example:
Query combinations w...
RAW POST using cURL in PHP
...TFIELDS, "body goes here" );
curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-Type: text/plain'));
$result=curl_exec ($ch);
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How to implement a queue using two stacks?
...
@Tyler If your stack is array based, as most are, you will always get O(n) worst case for a single operation.
– Thomas Ahle
Dec 6 '11 at 10:24
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