大约有 16,000 项符合查询结果（耗时：0.0275秒） [XML]
What does string::npos mean in this code?
... Comparing == -1 might make also make some people think they can convert that into < 0 which is NOT the same thing and will not work.
– Andy Dent
Mar 26 '12 at 7:56
...
Is it possible to use Swift's Enum in Obj-C?
I'm trying to convert some of my Obj-C class to Swift. And some other Obj-C classes still using enum in that converted class. I searched In the Pre-Release Docs and couldn't find it or maybe I missed it. Is there a way to use Swift enum in Obj-C Class? Or a link to the doc of this issue?
...
Explaining Python's '__enter__' and '__exit__'
...ptional case is handled here
exc = False
if not exit(mgr, *sys.exc_info()):
raise
# The exception is swallowed if exit() returns true
finally:
# The normal and non-local-goto cases are handled here
if exc:
exit(mgr, None, None, None)
try some cod...
Android image caching
...
Convert them into Bitmaps and then either store them in a Collection(HashMap,List etc.) or you can write them on the SDcard.
When storing them in application space using the first approach, you might want to wrap them around...
Convert NSArray to NSString in Objective-C
I am wondering how to convert an NSArray [@"Apple", @"Pear ", 323, @"Orange"] to a string in Objective-C .
9 Answers
...
How to use XPath in Python?
...("//*")
if len(res) != 2:
print "xpath query: wrong node set size"
sys.exit(1)
if res[0].name != "doc" or res[1].name != "foo":
print "xpath query: wrong node set value"
sys.exit(1)
doc.freeDoc()
ctxt.xpathFreeContext()
Sample of ElementTree XPath Use
from elementtree.ElementTre...
How to change string into QString?
...
If compiled with STL compatibility, QString has a static method to convert a std::string to a QString:
std::string str = "abc";
QString qstr = QString::fromStdString(str);
share
|
improve ...
How to reference generic classes and methods in xml documentation
...
None of the answers shown so far work completely for me. ReSharper won't convert the see tag into a Ctrl+click-able link (e.g. ) unless it completely resolves.
If the method in the OP were in a namespace called Test, the completely resolved link to the method shown would be:
<see cref="M:Test...
Why is “if not someobj:” better than “if someobj == None:” in Python?
...
In the first test, Python try to convert the object to a bool value if it is not already one. Roughly, we are asking the object : are you meaningful or not ? This is done using the following algorithm :
If the object has a __nonzero__ special method (as do...
ERROR: Error 1005: Can't create table (errno: 121)
...rch for these orphan tables with:
SELECT * FROM INFORMATION_SCHEMA.INNODB_SYS_TABLES WHERE NAME LIKE '%#sql%';
The version I was working with was 5.1, but the above command only works on versions >= 5.6 (manual is incorrect about it working for 5.5 or earlier, because INNODB_SYS_TABLES does no...