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Better way to check variable for null or empty string?
...tion (present and neither empty nor only white space
function IsNullOrEmptyString($str){
return (!isset($str) || trim($str) === '');
}
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iOS: how to perform a HTTP POST request?
...nd/or HTTP headers, use NSMutableURLRequest with
(void)setHTTPMethod:(NSString *)method
(void)setHTTPBody:(NSData *)data
(void)setValue:(NSString *)value forHTTPHeaderField:(NSString *)field
Send your request in 2 ways using NSURLConnection:
Synchronously: (NSData *)sendSynchronousRequest:(NSU...
Print list without brackets in a single row
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If some elements in names aren't strings, use print(', '.join(map(str,name))) instead.
– Anonymous
Dec 1 '19 at 9:43
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Why do we need virtual functions in C++?
... virtual modifier on/off to see what happens
//virtual
std::string Says() { return "?"; }
};
class Dog: public Animal
{
public: std::string Says() { return "Woof"; }
};
void test()
{
Dog* d = new Dog();
Animal* a = d; // refer to Dog instance with Animal pointer
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How to search a specific value in all tables (PostgreSQL)?
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can you explain in detail .. ? How to search string 'ABC' into all tables ?
– Mr. Bhosale
Jan 28 '17 at 6:47
1
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SQL query to select dates between two dates
...etween '2011/02/25' and '2011/02/27'
The date values need to be typed as strings.
To ensure future-proofing your query for SQL Server 2008 and higher, Date should be escaped because it's a reserved word in later versions.
Bear in mind that the dates without times take midnight as their defaults,...
bash: shortest way to get n-th column of output
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But then I need to type an extra space. That's too exhausting :)
– StackedCrooked
Jun 30 '18 at 9:32
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Convert a bitmap into a byte array
...er format it was in when you provided it, and returns the array. Skip the extra overhead of creating an ImageConverter class by using MemoryStream
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Selectors in Objective-C?
...l about the method names. In this case, the method name is just "lowercaseString", not "lowercaseString:" (note the absence of the colon). That's why you're getting NO returned, because NSString objects respond to the lowercaseString message but not the lowercaseString: message.
How do you know wh...
jquery stop child triggering parent event
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Or, rather than having an extra event handler to prevent another handler, you can use the Event Object argument passed to your click event handler to determine whether a child was clicked. target will be the clicked element and currentTarget will be t...