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How to use “not” in xpath?
...function in xpath (as opposed to an operator), so
//a[not(contains(@id, 'xx'))]
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乐高机器人®组件 · App Inventor 2 中文网
...假设传感器类型已通过SetInputMode配置。
MessageRead 读取消息(mailbox)
从机器人上的邮箱（1-10）读取消息。
MessageWrite 写入消息(mailbox,message)
将消息写入机器人上的邮箱（1-10）。
PlaySoundFile 播放声音文件(fileName)
在机器人...
javac not working in windows command prompt
... denotes the JDK installed directory, e.g., C:\Program Files\Java\jdk1.8.0_xx). You need to include the "\bin" directory in the PATH.
To edit the PATH environment variable in Windows XP/Vista/7/8:
Control Panel ⇒ System ⇒ Advanced system settings
Switch to "Advanced" tab ⇒ Environment Varia...
How to replace a string in multiple files in linux command line
...t, which is appended to the old file names. So sed -i .bak 's/foo/bar/g' *.xx moves all .xx files to the equivalent .xx.bak name and then generates the .xx files with the foo→bar substitution.
– Anaphory
Oct 4 '14 at 22:35
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NullPointerException in Java with no StackTrace
...f optimization. To get the stack traces back, you need to pass the option -XX:-OmitStackTraceInFastThrow to the JVM.
The optimization is that when an exception (typically a NullPointerException) occurs for the first time, the full stack trace is printed and the JVM remembers the stack trace (or may...
Possible reasons for timeout when trying to access EC2 instance
...
To connect use ssh like so:
ssh -i keyname.pem username@xxx.xx.xxx.xx
Where keyname.pem is the name of your private key, username is the correct username for your os distribution, and xxx.xx.xxx.xx is the public ip address.
When it times out or fails, check the following:
Sec...
How to specify new GCC path for CMake
...
Do not overwrite CMAKE_C_COMPILER, but export CC (and CXX) before calling cmake:
export CC=/usr/local/bin/gcc
export CXX=/usr/local/bin/g++
cmake /path/to/your/project
make
The export only needs to be done once, the first time you configure the project, then those values will ...
Wrapping a C library in Python: C, Cython or ctypes?
...ped out, just trying to show you the gist of it):
from ctypes import *
d2xx = WinDLL('ftd2xx')
OK = 0
INVALID_HANDLE = 1
DEVICE_NOT_FOUND = 2
DEVICE_NOT_OPENED = 3
...
def openEx(serial):
serial = create_string_buffer(serial)
handle = c_int()
if d2xx.FT_OpenEx(serial, OPEN_BY_SERIAL...
Updating MySQL primary key
...e a single "alter table" statement to update the primary key.
alter table xx drop primary key, add primary key(k1, k2, k3);
To fix things:
create table fixit (user_2, user_1, type, timestamp, n, primary key( user_2, user_1, type) );
lock table fixit write, user_interactions u write, user_interac...
程序员才能听得懂的笑话 - 轻松一刻 - 清泛网 - 专注C/C++及内核技术
...家里也有台电脑？CPU是什么型号的？”
13、北京程序员xx遭遇车祸成植物人，医生说活下来希望只有万分之一，唤醒更为渺茫。他的Leader和亲人没放弃，他们根据xx视工作如命的作风，每天都在他身边念：“xx！IE6侧边栏又乱了...