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XPath: How to check if an attribute exists?
Given the following XML, how do I write an XPath query to pull nodes where the attribute foo exists?:
3 Answers
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Should accessing SharedPreferences be done off the UI Thread?
...ng it's small, as it should be if you're using SharedPreferences, a simple XML file...) You don't want to fault it in the future time some user clicks a button.
but whenever you call context.getSharedPreferences(...), the backing XML file is stat'd to see if it's changed, so you'll want to avoid th...
Android Crop Center of Bitmap
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Have you considered doing this from the layout.xml ? You could set for your ImageView the ScaleType to android:scaleType="centerCrop" and set the dimensions of the image in the ImageView inside the layout.xml.
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Inspecting standard container (std::map) contents with gdb
... of date. With a recent GCC and GDB it Just WorksTM thanks to the built-in Python support in GDB 7.x and the libstdc++ pretty printers that come with GCC.
For the OP's example I get:
(gdb) print m
$1 = std::map with 2 elements = {[1] = 2, [2] = 4}
If it doesn't work automatically for you see the...
Using logging in multiple modules
I have a small python project that has the following structure -
11 Answers
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How do I write a bash script to restart a process if it dies?
I have a python script that'll be checking a queue and performing an action on each item:
8 Answers
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How do you write multiline strings in Go?
Does Go have anything similar to Python's multiline strings:
9 Answers
9
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Import multiple csv files into pandas and concatenate into one DataFrame
...abases) as if it was one data source. There must be something similar in python, since it has had a 20 year jump start on doing "big data".
– Hexatonic
Dec 28 '15 at 4:22
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Windows x64编程中寄存器的使用 - C/C++ - 清泛网 - 专注C/C++及内核技术
...48 8B F0 mov rsi,rax
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上面已经对 7 个参数的传递进行了标注，前 4 个参数通过 rcx,rdx,r8 以及 r9 寄存器传递，后 3 个参数确实通过 stack 传递。
可是，事情并没有这么简单：
在 Win64 下，会为每...
Why does substring slicing with index out of range work?
...ous. In the case of strings, the results appear to be identical because in Python, there's no such thing as an individual character outside of a string. A single character is just a 1-character string.
(For the exact semantics of slicing outside the range of a sequence, see mgilson's answer.)
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