大约有 44,000 项符合查询结果（耗时：0.0640秒） [XML]
How do I make a simple makefile for gcc on Linux?
I have three files: program.c , program.h and headers.h .
5 Answers
5
...
What is a serialVersionUID and why should I use it?
...VersionUID, which is used during deserialization to verify that the sender and receiver of a serialized object have loaded classes for that object that are compatible with respect to serialization. If the receiver has loaded a class for the object that has a different serialVersionUID than that of t...
How to pass a user defined argument in scrapy spider
...
Spider arguments are passed in the crawl command using the -a option. For example:
scrapy crawl myspider -a category=electronics -a domain=system
Spiders can access arguments as attributes:
class MySpider(scrapy.Spider):
name = 'myspider'
def __init__(self,...
Catch an exception thrown by an async void method
...ion of the call. */
}
}
Async void methods have different error-handling semantics. When an exception is thrown out of an async Task or async Task method, that exception is captured and placed on the Task object. With async void methods, there is no Task object, so any exceptions thrown ou...
Declaring a custom android UI element using XML
How do I declare an Android UI element using XML?
6 Answers
6
...
What happens if i return before the end of using statement? Will the dispose be called?
... is called -- I'm looking at you, WCF Service Reference / Client Proxy! -- and when that happens it can be very difficult to track down the original exception if Dispose was called during an exception stack unwind, since the original exception gets swallowed in favor of the new exception generated b...
What would be C++ limitations compared C language? [closed]
..., it which case it would compile in C, but be shunned by most C++ coding standards, and also by many C programmers; witness the "don't cast malloc" comments all over Stack Overflow).
They are not the same language, and if you have an existing project in C you don't want to rewrite it in a differe...
Autoincrement VersionCode with gradle extra properties
I'm building an Android app with gradle. Until now I used the Manifest file to increase the versionCode, but I would like to read the versionCode from an external file and depending if it is the release flavor or the debug flavor increase the versionCode. I tried the extra properties, but you can't ...
Selecting data frame rows based on partial string match in a column
...a data.table (but also remember that subsetting approaches for data.frames and data.tables are not identical):
library(data.table)
mtcars[rownames(mtcars) %like% "Merc", ]
iris[iris$Species %like% "osa", ]
If that is what you had, then perhaps you had just mixed up row and column positions for su...
How does facebook, gmail send the real time notification?
I have read some posts about this topic and the answers are comet, reverse ajax, http streaming, server push, etc.
5 Answer...