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App Inventor 2 蓝牙发送十六进制字节方案：文本转Hex字节详解 - App应用开...
...题描述用户在文本框输入"ABCD"，想通过蓝牙发送 0xAB 0xCD 两个字节，而不是四个ASCII字符（0x41 0x42 0x43 0x44）。
每两个字符代表一个十六进制字节，需要将字符对解析为实际的字节值。
问题本质输入期望发送实际发送（...
powershell 2.0 try catch how to access the exception
This is the try catch in PowerShell 2.0
1 Answer
1
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How do you use the ellipsis slicing syntax in Python?
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105
Ellipsis, or ... is not a hidden feature, it's just a constant. It's quite different to, say, j...
ERROR 2003 (HY000): Can't connect to MySQL server on '127.0.0.1' (111)
...abled):
run the command vim /etc/mysql/my.cnf
comment bind-address = 127.0.0.1 using the # symbol
restart your mysql server once.
Update
In Step 1, if you cannot find bind-address in the my.cnf file, look for it in /etc/mysql/mysql.conf.d/mysqld.cnf file.
Update in case of MySQL replication en...
Angularjs if-then-else construction in expression
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Rafael Almeida
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answered May 16 '13 at 11:16
Andre GoncalvesAndr...
How to redirect stderr to null in cmd.exe
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GolezTrol
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answered Dec 22 '10 at 9:06
atzzatzz
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Clojure: cons (seq) vs. conj (list)
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150
One difference is that conj accepts any number of arguments to insert into a collection, while c...
How do I get the real .height() of a overflow: hidden or overflow: scroll div?
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Use the .scrollHeight property of the DOM node: $('#your_div')[0].scrollHeight
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Javascript shorthand ternary operator
...:)
– Web_Designer
Jan 16 '12 at 18:10
8
For anyone curious, this works because JS's || operator d...
Using [UIColor colorWithRed:green:blue:alpha:] doesn't work with UITableView seperatorColor?
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You need to divide by 255.0
Because I hardly ever use values between 1.0 and 0.0, I created a very simple UIColor category that does the messy looking division by itself: (from http://github.com/Jon889/JPGeneral)
//.h file
@interface UIColor (JPExtr...