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蓝牙报错参考：https://community.appinventor.mi ... nges/77286?u=taifun
String comparison using '==' vs. 'strcmp()'
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AntimonyAntimony
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How to click first link in list of items after upgrading to Capybara 2.0?
...uery?
– emptywalls
May 10 '17 at 21:32
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How can I format a nullable DateTime with ToString()?
How can I convert the nullable DateTime dt2 to a formatted string?
20 Answers
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schema builder laravel migrations unique on two columns
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edited Nov 13 '17 at 15:32
Chuck Le Butt
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Obtain Bundle Identifier programmatically
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Tal ZionTal Zion
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AppInventor2中的二进制数据以什么样的形式传递？字节列表、字节数组是什么...
1、byte[] 类型（字节数组）的字段：App Inventor 无法直接处理字节数组，但它们可以作为扩展之间的通用 Object 类型变量进行交换。
MQTT拓展中的字节数组的处理方式就是这种，直接转换成byte[]：
@SimpleFunction(description = "Publishe...
In Django, how do I check if a user is in a certain group?
... mikumiku
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What is `params.require(:person).permit(:name, :age)` doing in Rails 4?
...age indicated by permit.
Example:
.new(person: { name: "Bhojendra", age: 32 }) // okay
.new(person: { name: "Rauniyar" }) // okay
.new(person: { name: "Bhojendra", other: 'asdf' }) // not okay, other not permitted
.new(person: { full_name: "Bhojendra Rauniyar" }) // not okay, full_name not permitt...
Linux下部署企业级邮件服务器(postfix + dovecot + extmail) - 开源 & Gith...
...装一下过程中所依赖的一些rpm包
yum install -y tcl-devel libart_lgpl-devel libtool-ltdl-devel
2、关闭sendmail，并取消其开机启动
service sendmail stop
chkconfig sendmail off
3、配置编译环境，安装开发包组
yum groupinstall -y "Development Tools" "Developm...