Windows Screenshot

Pure PowerShell GDI+ screenshot tool for Windows. No external dependencies, captures to PNG with automatic scaling.

Security Scan

The skill is internally consistent: it is an instruction-only PowerShell screenshot tool that only captures the primary screen to a local PNG and does not request credentials or network access by default.

Purpose & Capability

Name/description match the contents: the included PowerShell script captures the primary Windows screen using GDI+ and saves a PNG. No unrelated binaries, credentials, or installs are requested.

Instruction Scope

Runtime instructions simply run the provided PowerShell script which writes a PNG to $USERPROFILE\.openclaw\media (or OPENCLAW_MEDIA_DIR if set) and prints a MEDIA: path. The doc includes an optional example showing how a user could send the image via Telegram, but the script itself makes no network calls and does not read other system state. Users should note that screenshots may contain sensitive information.

Install Mechanism

No install spec and no code is downloaded or executed from remote hosts. This is an instruction-only skill with the PowerShell script included as screenshot.txt.

Credentials

The script optionally reads a single environment variable OPENCLAW_MEDIA_DIR to choose the output folder. No credentials or unrelated env vars are required. The Telegram example references TELEGRAM_BOT_TOKEN but that is not required by the script and is only part of an external manual workflow.

Persistence & Privilege

always is false and the skill does not request persistent privileges or modify other skills or system-wide settings; it only creates (if needed) and writes files in a per-user media directory.

Assessment

This skill appears to do exactly what it claims: capture the primary Windows screen and save a PNG locally. Before running it: (1) review the included screenshot.txt yourself (it's short and plain PowerShell); (2) be aware screenshots can contain sensitive data—don't run it in contexts with secrets you wouldn't want saved; (3) the script creates/uses $USERPROFILE\.openclaw\media by default (or a folder you set via OPENCLAW_MEDIA_DIR); (4) the Telegram example in the docs is optional and would only transmit images if you explicitly configure and run that separately with your bot token. If any of those behaviors are unacceptable, do not run the script or edit the output path first.

Windows 屏幕截图

一个纯 PowerShell 的屏幕截图工具，使用 GDI+ 捕获 Windows 屏幕。

特性

• ✅ 纯 PowerShell - 无需外部依赖
• ✅ GDI+ 图像库 - 高效的系统级屏幕捕获
• ✅ 多屏支持 - 捕获主屏幕
• ✅ 自动缩放 - 根据屏幕 DPI 自适应分辨率
• ✅ PNG 输出 - 24-bit 彩色图像
• ✅ 开源 - GitHub 源码 MIT-0 许可证

源代码透明性

本技能的所有代码都完全开放在 GitHub 上，可供审查：

• 📝 screenshot.ps1 完整源码
• 📖 完整项目文档
• 📋 MIT-0 许可证

这不是"下载执行"的方式。脚本代码是自包含的，在技能包中可直接审查。

脚本文件说明

本技能包中包含 screenshot.txt（PowerShell 脚本内容）。使用时：

1. 将 screenshot.txt 复制或重命名为 screenshot.ps1
2. 在 PowerShell 中执行：powershell -File screenshot.ps1

或者直接使用 GitHub 仓库中的脚本。

环境变量

脚本会自动检查以下环境变量（可选）：

• OPENCLAW_MEDIA_DIR - 自定义输出目录
  • 若未设置，默认使用 $USERPROFILE\.openclaw\media
  • 脚本会自动创建此目录

设置环境变量示例

PowerShell:

$env:OPENCLAW_MEDIA_DIR = "C:\MyScreenshots"
powershell -File screenshot.ps1

Command Prompt:

set OPENCLAW_MEDIA_DIR=C:\MyScreenshots
PowerShell -File screenshot.ps1

使用方法

方法 1：直接执行

powershell -File screenshot.ps1

输出：

MEDIA:C:\Users\YourUsername\.openclaw\media\screenshot_YYYYMMDD_HHMMSS.png

方法 2：通过 OpenClaw

openclaw exec powershell -File screenshot.ps1

方法 3：发送到 Telegram（需要配置环境变量）

# 步骤 1：捕获截图
openclaw exec powershell -File screenshot.ps1

# 步骤 2：发送（需要 TELEGRAM_BOT_TOKEN 和用户 ID）
openclaw message send --channel telegram --target YOUR_USER_ID --media /path/to/screenshot.png

输出

脚本将截图保存为 PNG：

.openclaw/media/screenshot_YYYYMMDD_HHMMSS.png

并输出 MEDIA: 前缀路径用于后续处理。

技术细节

属性	值
图像库	System.Drawing (GDI+)
格式	PNG 24-bit
分辨率	自适应（根据屏幕缩放）
文件大小	通常 50-200 KB
依赖	.NET Framework 4.x+（Windows 内置）

故障排查

问题	解决方案
"找不到类型 System.Drawing"	在 .NET Framework 4.x+ 上运行（Windows 默认）
图像全黑	检查屏幕/GPU 状态；确保不在锁屏
文件名冲突	脚本使用时间戳自动避免重复

许可

MIT-0 - 无署名、无限制使用、修改和分发。

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安全声明

✅ 所有代码都是开源的且经过审查

• 脚本功能：捕获屏幕内容到 PNG 文件
• 数据处理：仅保存到本地 .openclaw/media 目录
• 网络请求：无（除非显式使用 Telegram 集成）
• 隐私：仅在用户明确调用时执行

源码：https://github.com/vvxer/windows-screenshot