大约有 8,000 项符合查询结果（耗时：0.0427秒） [XML]
通过 ulimit 改善系统性能 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...改系统的 /etc/security/limits 配置文件。该文件不仅能限制指定用户的资源使用，还能限制指定组的资源使用。该文件的每一行都是对限定的一个描述，格式如下：
<domain> <type> <item> <value>
domain 表示用户或者组的名字，还可...
configure: error: Unable to find gd.h anywhere under /usr/local/gd - ...
...里就可以解决。
解决方式：
1.在gd库的安装路径下搜索没有发现gd.h文件，但是在/etc/include下有gd.h文件
2.在网上搜索发现重装gd库可解决
3.重新安装gd库，在安装时出现：
configure.ac:64: error: possibly undefined macro: AM_ICONV
If th...
Mocking static methods with Mockito
...ception occurred while fetching localhost address", e);
return UUID.randomUUID().toString();
}
}
}
My test class:
@RunWith(PowerMockRunner.class)
@PrepareForTest(SmokeRouteBuilder.class)
public class SmokeRouteBuilderTest {
@Test
public void testSmokeMessageId_exce...
Web API 最佳入门指南 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...装Mongo DB，步骤看这里。
2. Mongo DB C# driver下载可以在nuget搜索mongocsharpdriver。
3. 如果想本地察看数据库中内容，下载MongoVUE。
4. Knockoutjs下载可以在nuget搜索knockoutjs。
代码实现
1. 创建项目
创建MVC4 Web Application
在Project Templat...
Add a reference column migration in Rails 4
...cument if someone has the same problem...
In my situation I've been using :uuid fields, and the above answers does not work to my case, because rails 5 are creating a column using :bigint instead :uuid:
add_reference :uploads, :user, index: true, type: :uuid
Reference: Active Record Postgresql UUID...
Getting MAC Address
...
Python 2.5 includes an uuid implementation which (in at least one version) needs the mac address. You can import the mac finding function into your own code easily:
from uuid import getnode as get_mac
mac = get_mac()
The return value is the mac...
Getting an element from a Set
... match this "copied" instance with the original one, I decided to use Java UUIDs.
So I created an abstract class UniqueItem, which automatically gives a random unique id to each instance of its subclasses.
This UUID is shared between the client and the server instance, so this way it could be easy...
BLE 模块 透传问题 - 创客硬件开发 - 清泛IT社区，为创新赋能！
问一下老师 1.这个蓝牙传输一次，是一个多字节包？还是单一个字节？
2.我想传文件，是否要先设变量读进数据？有哪位老师给讲一下。
根据 ble ...
APP INVENTOR硬件交互学习教程02——资源介绍 - 创客硬件开发 - 清泛IT社区...
...外发射和接收，方便进行红外解码，红外发射实验
6.蓝牙模块插座，方便扩展配置
7.一路继电器，可以进行大功率设备控制实验
8.一路蜂鸣器，可以进行一些报警实验。
9.其他扩展外设模块，WS2812，舵机，RF模块...
【解决】Error 515: Not connected to a Bluetooth device. - 创客硬件开发...
Error 515: Not connected to a Bluetooth device.
原因：经典蓝牙设备未正常连接上，就进行数据收发操作导致的异常，加一个连接状态判断就行。