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App Inventor 2 控制代码块 · App Inventor 2 中文网
...another screen）
打开另一屏幕并传值（open another screen with start value）
获取初始文本值（get plain start text）
获取初始值（get start value）
关闭屏幕（close screen）
关闭屏幕并返回文本（close screen with plain text）
关闭屏幕并返回...
What's the difference between ASCII and Unicode?
... á, ü, ç, ñ, etc. (aka diacritics).
ASCII Extended
Some clever people started using the 8th bit (the bit used for parity) to encode more characters to support their language (to support "é", in French, for example). Just using one extra bit doubled the size of the original ASCII table to map u...
Deleting queues in RabbitMQ
...y persistent messages
rabbitmqctl stop_app
rabbitmqctl reset
rabbitmqctl start_app
The rabbitmq documentation says that the reset command:
Returns a RabbitMQ node to its virgin state.
Removes the node from any cluster it belongs to, removes all data from
the management database, such...
/bin/sh: pushd: not found
...ocesses. (A hypothetical pushd command might do the chdir(2) call and then start a new shell, but ... it wouldn't be very usable.) pushd is a shell builtin, just like cd.
So, either change your script to start with #!/bin/bash or store the current working directory in a variable, do your work, then...
CentOS+Nginx+PHP+MySQL详细配置(图解) - 更多技术 - 清泛网 - 专注C/C++及内核技术
...p.ini
下面我们就要启动PHP-FPM
#/usr/local/php/sbin/php-fpm start
在启动PHP-FPM时会报上面这个错误，原因是PHP-FPM自己不知道以那个用户和组运行PHP，所以我们要修改一个文件，把文件中的注释去掉即可（打开文件把红色部分删除...
What does 'public static void' mean in Java?
...
the java runtime environment must call the main method to start your application. it couldn't do that when it were private.
– Philipp
Sep 4 '12 at 20:44
add a...
Inserting image into IPython notebook markdown
I am starting to depend heavily on the IPython notebook app to develop and document algorithms. It is awesome; but there is something that seems like it should be possible, but I can't figure out how to do it:
...
MVC 4 @Scripts “does not exist”
...ce the release of MVC 4 System.Web.Optimization is now obsolete. If you're starting with a blank solution you will need to install the following nuget package:
Install-Package Microsoft.AspNet.Web.Optimization
You will still need to reference System.Web.Optimization in your web.config files. For ...
How can I convert this foreach code to Parallel.ForEach?
...w processes can be slower, as they're run serially
Process 2 can't start until 1 is done. Process 3 can't start until 2 & 1 are done...
Execution of quick processes can be faster, as there is no threading overhead
Parallel.ForEach:
Execution takes place in parallel way.
...
Excel RTD(Excel Real-Time Data)实时刷新数据技术 - C/C++ - 清泛网 - 专注C/C++及内核技术
...OM组件就是所谓的RTD Server。IRTDServer具有以下成员：
ServerStart(CallbackObject)
CallbackObject 是一个IRTDUpdateEvent类型的参数，它有一个UpdateNotify方法，用于通知Excel有更新的数据可用（push）。这样Excel就会通过调用RefreshData方法来刷新所...