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蓝牙配对pin码设置 - 创客硬件开发 - 清泛IT社区,为创新赋能!

...成功。以下是一些有关蓝牙配对 PIN 码设置的注意事项:默认 PIN 码:许多蓝牙设备都有一个默认的 PIN 码。如果您没有更改过设备的 PIN 码,那么默认的 PIN 码很可能是 0000 或者 1234。自定义 PIN 码:为了更好地保护您的蓝牙设备...
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Is [UIScreen mainScreen].bounds.size becoming orientation-dependent in iOS8?

...: "View Controller Advancements in iOS 8" Quote from the presentation: UIScreen is now interface oriented: [UIScreen bounds] now interface-oriented [UIScreen applicationFrame] now interface-oriented Status bar frame notifications are interface-oriented Keyboard frame notifications are interface-...
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搭建高可用mongodb集群(二)—— 副本集 - 大数据 & AI - 清泛网 - 专注C/...

...laveOk=false", "code" : 13435 } at src/mongo/shell/query.js:128 #mongodb默认是从主节点读写数据的,副本节点上不允许读,需要设置副本节点可以读。 repset:SECONDARY> db.getMongo().setSlaveOk(); #可以看到数据已经复制到了副本集。 repset:SECONDARY>...
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TCP 的那些事儿(上) - 更多技术 - 清泛网 - 专注C/C++及内核技术

...如果在一定时间内没有收到的TCP会重发SYN-ACK。在Linux下,默认重试次数为5次,重试的间隔时间从1s开始每次都翻售,5次的重试时间间隔为1s, 2s, 4s, 8s, 16s,总共31s,第5次发出后还要等32s都知道第5次也超时了,所以,总共需要 1s +...
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如何抓住痛点做出让用户尖叫的产品 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...信的任一聊天窗口,选择“+”号发送其他内容时,微信默认会提示你是否要发送刚刚截取的那张图片,此时可以选这图片,也可以继续选择发送表情、位置等其他内容,几秒后不选择,提示就会消失,整体上不影响操作流程,...
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CGRidCtrl控件 学习心得 - C/C++ - 清泛网 - 专注C/C++及内核技术

...ID,作为本次创建的控件对象的标识 dwStyle:控件风格,默认值为:WS_CHILD | WS_BORDER | WS_TABSTOP | WS_VISIBLE。 常用风格请参见下表: 控件风格ID 说明 WS_CHILD 说明窗口为子窗口 WS_OVERLAPPED ...
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How to check an Android device is HDPI screen or MDPI screen?

... Density values described at: developer.android.com/guide/practices/screens_support.html – esilver Jan 21 '14 at 21:52 1 ...
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Linux下部署企业级邮件服务器(postfix + dovecot + extmail) - 开源 & Gith...

...编译安装postfix 从配置简单方面考虑,我们根据postfix的默认配置条件进行新建用户等,以免漏掉某些修改,导致的一些麻烦 1、建立postfix用户,并且指定UID,GID为2525,组postdrop groupadd -g 2525 postfix useradd -g postfix -u 2525 -s /sbin/n...
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How can I get the current screen orientation?

...onConfigurationChanged() may crash. User will use this code to get current screen orientation. public int getScreenOrientation() { Display getOrient = getActivity().getWindowManager().getDefaultDisplay(); int orientation = Configuration.ORIENTATION_UNDEFINED; if(getOrient.getWidth()==g...
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Why is printing to stdout so slow? Can it be sped up?

...can it be that writing to physical disk is WAY faster than writing to the "screen" (presumably an all-RAM op), and is effectively as fast as simply dumping to the garbage with /dev/null? Congratulations, you have just discovered the importance of I/O buffering. :-) The disk appears to be faster, ...