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Find out whether Chrome console is open
...7x fa-power-off"></i></div>
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<p><b>Now press F12 to see if this works for your browser!</b></p>
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How can I programmatically check whether a keyboard is present in iOS app?
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Nice answer! I know this is several years old but the NSAutoreleasePool alloc/release can now be replaced by surrounding the code in @autoreleasepool { }
– chown
Sep 12 '12 at 23:06
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How to change the type of a field?
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This is great - do you know how you'd convert a string (think currency like '1.23') to the integer 123? I assume you'd have to parse it as a float or decimal, multiply it by 100, then save it as an integer, but I can't find the right docs to do thi...
How to re-sign the ipa file?
... do from the command line. I had a gist of a script for doing this. It has now been incorporated into the ipa_sign script in https://github.com/RichardBronosky/ota-tools which I use daily. If you have any questions about using these tools, don't hesitate to ask.
The heart of it is this:
CODESIGN_ALL...
How to var_dump variables in twig templates?
...you only present what you have been given is fine and all, but how do you know what is available? Is there a "list all defined variables" functionality in TWIG? Is there a way to dump a variable?
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How to prevent gcc optimizing some statements in C?
... memory stores and loads. One purpose of volatile is to let the compiler know that the memory access has side effects, and therefore must be preserved. In this case, the store has the side effect of causing a page fault, and you want the compiler to preserve the page fault.
This way, the surround...
Converting Long to Date in Java returns 1970
...nt of whole seconds since the same epoch reference of 1970-01-01T00:00Z.
Know Your Data
People use various precisions in tracking time as a number since an epoch. So when you obtain some numbers to be interpreted as a count since an epoch, you must determine:
What epoch?Many epochs dates have been...
print call stack in C or C++
... we can reach native speeds with compile code, but I'm lazy to test it out now: How to call assembly in gdb?
main.cpp
void my_func_2(void) {}
void my_func_1(double f) {
my_func_2();
}
void my_func_1(int i) {
my_func_2();
}
int main() {
my_func_1(1);
my_func_1(2.0);
}
main.gdb
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Converting datetime.date to UTC timestamp in Python
...eturn (td.microseconds + (td.seconds + td.days * 86400) * 10**6) / 10**6
now = datetime.utcnow()
print now
print totimestamp(now)
Beware of floating-point issues.
Output
2012-01-08 15:34:10.022403
1326036850.02
How to convert an aware datetime object to POSIX timestamp
assert dt.tzinfo is n...
What is the purpose of the word 'self'?
...stance attributes. That's why assigning to an instance attribute needs to know what instance to assign to, and that's why it needs self..
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