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手机APP上的串口通信组件 - 创客硬件开发 - 清泛IT社区,为创新赋能!
... Iot 专题)手机串口通信模型如下:可以看到,手机串口连接时,没有像PC那样指定“COM3”等端口,而是直接使用默认的USB设备:
有一个英文原版视频,请参考“串口通信器“组件相关文档:《App Inventor 2 串口组件:App使用OTG...
GoPrint aia源码 UI界面现代、代码不复杂,参考性强 - .aia 案例源码 - 清...
屏幕数量:6个,UI界面现代、代码不复杂,参考性强。
需要连接蓝牙硬件进行通信,具体逻辑请自行研究。
蓝牙客户端组件:为什么不显示蓝牙设备列表?为啥蓝牙列表为空 - App Inven...
转会员提问:蓝牙客户端组件:为什么不显示蓝牙设备列表?为啥蓝牙列表为空?
解决方法:设置中打开 app 的“附近设备权限”即可。
win7 安装项目管理工具redmine2.5.1 - 开源 & Github - 清泛网 - 专注C/C++及内核技术
...ine.* TO 'redmine'@'localhost';
flush PRIVILEGES;
d) 修改redmine连接数据库文件:
redmine目录下的config/database.yml.example 改为config/database.yml
修改production一段:
production:
adapter: mysql2
database: redmine
host: localhost
username: root
...
解决 Error 503: The specified address is not a valid Bluetooth MAC add...
...ss is not a valid
Bluetooth MAC address.
原因是地址格式不对,蓝牙列表可能显示不对。大概率是经典蓝牙和 ble 低功耗蓝牙的设备列表处理的方式不对。
本例中就是经典蓝牙,但是用的 ble 的方式显示导致的问题。
Set selected item of spinner programmatically
...
An error with this code is that @Boardy want the selection of Category 2 which I suppose is a String (assuming he tried using Spinner.SelectedText = "Category 2") but the above code is for a long.
– Arun Ge...
Linux下部署企业级邮件服务器(postfix + dovecot + extmail) - 开源 & Gith...
...空格或tab的文本行视为上一行的延续;
5、启动postfix,连接发信
四、为postfix开启基于cyrus-sasl认证功能
1、检查postfix是否支持cyrus-sasl认证
postconf -a
2、配置postfix的主配置文件
vim /etc/postfix/main.cf
在最后添加以下内容
...
Convert a RGB Color Value to a Hexadecimal String
...ger g = sGreen.getValue();
Integer b = sBlue.getValue();
Color hC;
hC = new Color(r,g,b);
String hex = Integer.toHexString(hC.getRGB() & 0xffffff);
while(hex.length() < 6){
hex = "0" + hex;
}
hex = "Hex Code: #" + hex;
return hex;
}
...
转:postfix安装Q&A - 更多技术 - 清泛网 - 专注C/C++及内核技术
...错提示。
QUOTE:
Q:
smtpd认证失败:无权限连接authdaemond
Nov 20 15:58:54 bsd6 postfix/smtpd[900]: warning: SASL authentication failure: cannot connect to Courier authdaemond: Permission denied
A:
检查 authdaemond的socket所在目录及其父目录的属...
Ruby Bundle Symbol not found: _SSLv2_client_method (LoadError)
...
@twelve17 The errors are related to not being able to find an SSL library and the OP mentioned that they had recently upgraded their installed version of openssl. I had the same issue with the same upgrade scenario; I suspect the reinstall...
