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psql: could not connect to server: No such file or directory (Mac OS X)
Upon restarting my Mac I got the dreaded Postgres error:
21 Answers
21
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Open a folder using Process.Start
...eteness, if all you want to do is to open a folder, use this:
System.Diagnostics.Process.Start(new System.Diagnostics.ProcessStartInfo() {
FileName = "C:\\teste\\",
UseShellExecute = true,
Verb = "open"
});
Ensure FileName ends with Path.DirectorySeparatorChar to make it unambiguously...
Programmatically obtain the Android API level of a device?
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What you need: http://developer.android.com/reference/android/os/Build.VERSION_CODES.html
SDK_INT value Build.VERSION_CODES Human Version Name
1 BASE Android 1.0 (no codename)
2 BASE_1_1 ...
APP INVENTOR硬件交互学习教程06——硬件参数上报 - 创客硬件开发 - 清泛IT...
...节主要实现硬件参数上报，板子接收到指令，执行后反馈一个状态给APP。
1.界面组件
增加两个标签，一个布局，一个文本输入框
2.程序逻辑
增加接收处理和显示判断
3.arduino nano代码
// 引脚定义
const int ledPin1 = &nbs...
App Inventor 2 天气预报App开发 - 第三方API接入的通用方法 · App Inventor 2 中文网
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App原理介绍
第三方天气API介绍
创建一个项目
填写必要的参数
查看已创建的项目
查看API文档，确定我们需要准备的数据
请求示例：北京7天预报
第三方API的调用
JSON结果的解析 ...
【研究中】高德地图API研究及接入 - App应用开发 - 清泛IT社区，为创新赋能！
...一种瓦片地图服务，将地图分成无数个小块，每个块对应一个特定的URL。高德地图提供了XYZ格式的瓦片服务，可以通过XYZ方式加载高德地图。
如何使用XYZ方式加载高德地图
引入OpenLayers库：首先，确保已经引入了OpenLayers...
App Inventor 2 数据库方案全览：从本地存储到云端服务 - App应用开发 - 清...
...，采用键值对（Key-Value）模式，使用起来非常简单——存一个标签，取一个值。适合保存一些简单的配置信息、用户偏好设置等。
但要注意，数据只在本地，App卸载就没了，且不同设备之间不能同步。
2. SQLite
- 类型：拓...
how to unit test file upload in django
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From Django docs on Client.post:
Submitting files is a special case. To POST a file, you need only
provide the file field name as a key, and a file handle to the file
you wish to upload as a value. For example:
c = Client()
with open('wishlist...
How to avoid “cannot load such file — utils/popen” from homebrew on OSX
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The problem mainly occurs after updating OS X to El Capitan (OS X 10.11) or macOS Sierra (macOS 10.12).
This is because of file permission issues with El Capitan’s or later macOS's new SIP process. Try changing the permissions for the /usr/local directory:
$ sud...
Is calculating an MD5 hash less CPU intensive than SHA family functions?
...w 60 MB/s. Even though SHA-256 appears "slow" here, it is fast enough for most purposes.
Note that OpenSSL includes a 32-bit implementation of SHA-512 which is quite faster than my code (but not as fast as the 64-bit SHA-512), because the OpenSSL implementation is in assembly and uses SSE2 register...