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Determining 32 vs 64 bit in C++

... #if _WIN32 || _WIN64 … #elif __GNUC__ … #else # error "Missing feature-test macro for 32/64-bit on this compiler."? – Davislor Nov 29 '15 at 20:24 ...
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How to add column if not exists on PostgreSQL?

...lumn already exists, adds if it doesn't and will continue to fail on other errors (like an invalid data type). I don't recommend doing ANY of these methods if these are random strings coming from external sources. No matter what method you use (client-side or server-side dynamic strings executed as...
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抱腾讯大腿联姻知乎 搜狗不止要抄底百度 - 资讯 - 清泛网 - 专注C/C++及内核技术

...的PC时代,无论是搜索引擎或者其他一些信息工具,都是连接人与信息,而无线移动时代、共享经济时代,搜索更具“人性”。具体表现在以下三个方面:1,伴随着网页形态的变化,用户的需求也在改变,即用户需要更精准地去...
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笨法玩电商网站秒杀 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...方法,它尝试从一个LIST里取元素,如果LIST为空则会堵塞连接,利用这个特性我们可以实现一个简易的通知功能:程序把请求保存到Redis队列里,然后调用BLPOP或BRPOP方法等通知,因为此时LIST为空,所以会堵塞连接,与此同时Gearma...
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Sql server默认的端口是多少?如何开启远程连接? - 爬虫/数据库 - 清泛IT...

默认是1433,可以在配置管理器中查看: 需要开放1433端口,可以参考《Windows、Linux开放指定端口》。 另外,开启远程连接还需要启用TCP/IP,然后重启服务,步骤如下:
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如果后面再出现“AI伴侣断开连接”,说明mit官方的rez服务器有问题,需要重...

如果后面再出现“AI伴侣断开连接”,说明mit官方的rez服务器有问题,需要重启等处理。原因大概是wenrtc通信问题,官方论坛有提到。。。但是保险起见,如果频繁出现,则需要启用我们自己的rez服务器。或者aiStarter顶上昨天坏...
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App Inventor 2 代码调试方式:App调试、问题排查方法 - App Inventor 2 中...

...2 调试方式所有调试App的前提是安装好AI伴侣,并与AI伴侣连接后进行,我们在设计界面的每次改动,都会实时的反映在AI伴侣中。AI伴侣可以运行在手机上,也可以是安卓模拟器。AI伴侣具体的安装及连接步骤请参考《App Inventor 2 ...
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mqtt协议加密连接,仅ca证书如何配置? - App Inventor 2 中文网 - 清泛IT...

mqtt协议加密连接,仅ca证书如何配置?
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BLE UUID是对的但连接闪退:java.lang.IllegalArgumentException: UUID str...

请问UUID是对的 连接闪退, 下面是报错日志 java.lang.ExceptionInInitializerError at edu.mit.appinventor.ble.BluetoothLEint$BLEReadOperation.subscribe(BluetoothLEint.java:357) at edu.mit.appinventor.ble.BluetoothLEint$BLEReadOperation.run(BluetoothLEint.java:325) at android.os....
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How to restart Jenkins manually?

...e just started working with Jenkins and have run into a problem. After installing several plugins it said it needs to be restarted and went into a "shutting down" mode, but never restarts. ...