大约有 36,010 项符合查询结果（耗时：0.0391秒） [XML]
Warning: “format not a string literal and no format arguments”
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Are you nesting your brackets correctly? I don't think NSLog() likes taking only one argument, which is what you're passing it. Also, it already does the formatting for you. Why not just do this?
NSLog(@"%@ %@, %@",
errorMsgFormat,
error,
[error userInfo]...
Start two instances of IntelliJ IDE
Well my question is pretty simple, how do I start two instances of IntelliJ (community edition).
When I have one instance started and I try to start another one, all that happens is that my started instance gets focus.
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In Python, how do you convert seconds since epoch to a `datetime` object?
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datetime.datetime.fromtimestamp will do, if you know the time zone, you could produce the same output as with time.gmtime
>>> datetime.datetime.fromtimestamp(1284286794)
datetime.datetime(2010, 9, 12, 11, 19, 54)
or
>>> datetime.datetime.u...
How can I get the intersection, union, and subset of arrays in Ruby?
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Utilizing the fact that you can do set operations on arrays by doing &(intersection), -(difference), and |(union).
Obviously I didn't implement the MultiSet to spec, but this should get you started:
class MultiSet
attr_accessor :set
def initialize...
Android Spinner: Get the selected item change event
...us answers are not correct. They work for other widgets and views, but the documentation for the Spinner widget clearly states:
A spinner does not support item click
events. Calling this method will raise
an exception.
Better use OnItemSelectedListener() instead:
spinner.setOnItemSelecte...
Calculate size of Object in Java [duplicate]
...omparing sizes of data structures) and it seems like there is no method to do this in Java. Supposedly, C/C++ has sizeOf() method, but this is nonexistant in Java. I tried recording the free memory in the JVM with Runtime.getRuntime().freeMemory() before and after creating the object and then re...
Running a cron every 30 seconds
...minute but with a step of 30 (in other words, every half hour). Since cron does not go down to sub-minute resolutions, you will need to find another way.
One possibility, though it's a bit of a kludge(a), is to have two jobs, one offset by 30 seconds:
# Need these to run on 30-sec boundaries, keep c...
Is it possible to have multiple styles inside a TextView?
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In case, anyone is wondering how to do this, here's one way: (Thanks to Mark again!)
mBox = new TextView(context);
mBox.setText(Html.fromHtml("<b>" + title + "</b>" + "<br />" +
"<small>" + description + "</small>" +...
Execute the setInterval function without delay the first time
...elf for subsequent calls using setTimeout instead:
function foo() {
// do stuff
// ...
// and schedule a repeat
setTimeout(foo, delay);
}
// start the cycle
foo();
This guarantees that there is at least an interval of delay between calls. It also makes it easier to cancel the loop ...
Postgresql: password authentication failed for user “postgres”
...led. I did it before a couple of times without this problem. What should I do? And what happens?
18 Answers
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