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Installing Ruby Gem in Windows
I'm new to ruby. I tried to install GEM on my PC by following the steps given in the site http://rubygems.org/pages/download .
...
How to get a list of current open windows/process with Java?
...
This is another approach to parse the the process list from the command "ps -e":
try {
String line;
Process p = Runtime.getRuntime().exec("ps -e");
BufferedReader input =
new BufferedReader(new InputStreamReader(p.getInputStream()));
while ((line = input.readLine()) !=...
App Inventor 2 试验组件 · App Inventor 2 中文网
...tBot 是一个不可见组件，用于与 AI 聊天的聊天机器人。此版本使用 MIT 运行的代理，该代理又使用 ChatGPT 生成大语言模型。
注：此组件对AI伴侣要求最低版本为v2.67 (旧版本请扫码升级：帮助 -> AI伴侣信息)，编译为apk则不受限制...
Closing Database Connections in Java
...with them, something like that:
Connection conn = null;
PreparedStatement ps = null;
ResultSet rs = null;
try {
// Do stuff
...
} catch (SQLException ex) {
// Exception handling stuff
...
} finally {
if (rs != null) {
try {
rs.close();
} catch (SQLE...
Can I get “&&” or “-and” to work in PowerShell?
.../27: The &&operator is now available for PowerShell 7 Preview 5+:
PS > echo "Hello!" && echo "World!"
Hello!
World!
share
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How do I get the current username in Windows PowerShell?
...ect as argument 2.
Usage:
$cred = Get-Credential UserTo.RunAs
Run-AsUser.ps1 "whoami; pause" $cred
Run-AsUser.ps1 "[System.Security.Principal.WindowsIdentity]::GetCurrent().Name; pause" $cred
Contents of Run-AsUser.ps1 script:
param(
[Parameter(Mandatory=$true)]
[string]$script,
[Paramete...
Does PowerShell support constants?
...rom http://poshcode.org/4063
function Set-Constant {
<#
.SYNOPSIS
Creates constants.
.DESCRIPTION
This function can help you to create constants so easy as it possible.
It works as keyword 'const' as such as in C#.
.EXAMPLE
PS C:\> Set-Constan...
Socket 错误返回码详解 - C/C++ - 清泛网 - 专注C/C++及内核技术
...AESOCKTNOSUPPORT (10044) 不支援的socket型別
目前使用的WinSock版本不支援函式所指定的socket型別。舉例來說，完全根據WinSock 1.1版的規格書發展的WinSock協定核心，並不支援SOCK_RAW這個socket型別。在呼叫socket()函式時，位址家族選 AF_INET...
App Inventor 2开发简单计算器 - App Inventor 2 中文网 - 清泛IT论坛，有思想、有深度
...事件处理程序，蓝色块代表过程，橙色块代表全局变量，绿色块代表组件或组件的属性。这个程序中用到的组件个数虽然多，但种类很少。从图中可以看出，关联度最高的是全局变量后数，所有的按钮点击事件都与之相关联，因...
记录一些Mac OS X技巧 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...es -bool false
killall Finder
修改终端的提示文字
环境变量PS1就是终端的提示文字格式，默认为“\h:\W \u\$”，可以用echo来查看：
echo $PS1
PS2则是换行后的提示符，默认为“>”。
部分可使用的格式有（完整的可以运行man bash，...