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App Inventor 2 BLE扩展源码分析 - WriteBytes vs WriteStrings 23字节硬编...
一、问题背景
用户反馈：WriteBytes 发送字符串硬件能收到，WriteStrings 发送却收不到。
同样的字符串数据，通过 WriteBytes 方法发送时硬件正常接收，但通过 WriteStrings 方法发送时硬件收不到或收到截断数据。
源码仓库: mit-c...
Coding in Other (Spoken) Languages
This is something I've always wondered, and I can't find any mention of it anywhere online. When a shop from, say Japan, writes code, would I be able to read it in English? Or do languages, like C, PHP, anything, have Japanese translations that they write?
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How can I generate Unix timestamps?
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edited Aug 23 '18 at 1:47
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How can I extract a good quality JPEG image from a video file with ffmpeg?
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Use -qscale:v to control quality
Use -qscale:v (or the alias -q:v) as an output option.
Normal range for JPEG is 2-31 with 31 being the worst quality.
The scale is linear with double the qscale being roughly half the bitrate.
Recommend trying values of ...
What is a lambda (function)?
For a person without a comp-sci background, what is a lambda in the world of Computer Science?
23 Answers
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How to completely remove a dialog on close
When an ajax operation fails, I create a new div with the errors and then show it as a dialog. When the dialog is closed I would like to completely destroy and remove the div again. How can I do this? My code looks something like this at the moment:
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MySQL Orderby a number, Nulls last
...x to sort nulls last. Place a minus sign (-) before the column name and switch the ASC to DESC:
SELECT * FROM tablename WHERE visible=1 ORDER BY -position DESC, id DESC
It is essentially the inverse of position DESC placing the NULL values last but otherwise the same as position ASC.
A good ref...
What is the best algorithm for overriding GetHashCode?
... in a lot of places throughout the .NET base class libraries. Implementing it properly is especially important to find items quickly in a collection or when determining equality.
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How to delete migration files in Rails 3
...:migrate again.
If your application is already on production or staging, it's safer to just write another migration that destroys your table or columns.
Another great reference for migrations is: http://guides.rubyonrails.org/migrations.html
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How to pass parameters to ThreadStart method in Thread?
... that you can pass multiple parameters, and you get compile-time checking without needing to cast from object all the time.
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