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What's the best way of scraping data from a website? [closed]
...unethical anyway, so write a well behaved bot and don't worry about this.
Testing
Not a unit/integration test person? Too bad. You will now have to become one. Sites change frequently and you will be changing your code frequently. This is a large part of the challenge.
There are a lot of moving p...
How expensive is RTTI?
...ique object for each type, even across dynamic linking boundaries. You can test &typeid(a) == &typeid(b), or just rely on the fact that the portable test typeid(a) == typeid(b) does actually just compare a pointer internally.
In GCC's preferred ABI, a class vtable always holds a pointer to ...
Running a Python script from PHP
...
Tested on Ubuntu Server 10.04. I hope it helps you also on Arch Linux.
In PHP use shell_exec function:
Execute command via shell and return the complete output as a string.
It returns the output from the executed co...
Why 0 is true but false is 1 in the shell?
...convention saying 0 means success, and other values mean some error.
With test, [ ] or [[ ]] operators, bash conditions evaluate as true in case of an exit code of 0 (the result of /bin/true). Otherwise they evaluate as false.
Strings are evaluated differently than exit codes:
if [ 0 ] ; then ech...
How to add percent sign to NSString
...helps in some cases, it is possible to use the unicode character:
NSLog(@"Test percentage \uFF05");
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C语言结构体里的成员数组和指针 - C/C++ - 清泛网 - 专注C/C++及内核技术
...简单化一下代码：
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struct test{
int i;
char *p;
};
上面代码中，test结构中i和p指针，在C的编译器中保存的是相对地址——也就是说，他们的地址是相对于struct test的实例的。如果...
How to have an automatic timestamp in SQLite?
...CURRENT_TIMESTAMP NOT NULL
);
INSERT INTO my_table(name, sqltime) VALUES('test1', '2010-05-28T15:36:56.200');
INSERT INTO my_table(name, sqltime) VALUES('test2', '2010-08-28T13:40:02.200');
INSERT INTO my_table(name) VALUES('test3');
This is the result:
SELECT * FROM my_table;
...
When to use enumerateObjectsUsingBlock vs. for
...ion allows the collection class to enumerate contents as quickly as the fastest traversal of the native storage format. Likely irrelevant for arrays, but it can be a huge difference for dictionaries.
"Don't use enumerateObjectsUsingBlock when you need to modify local variables" - not true; you can ...
Test if something is not undefined in JavaScript
...for me:
typeof possiblyUndefinedVariable !== "undefined"
I will have to test that in other browsers and see how things go I suppose.
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Checking if object is empty, works with ng-show but not from controller?
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thanks! actually i ended up testing it with undefined and it worked great. thanks.
– Martin
Jul 27 '13 at 13:09
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