ネット上で検索する術も無いのかよ・・・
https://qiita.com/toshinarin/items/d0d1e9a36e88ea98bd72

@echo on
SET ADB_HOME=D:\Program Files\Nox\bin
SET ADB_CMD=%ADB_HOME%\nox_adb.exe
set DEVICE=127.0.0.1:62001
set YYYYMMDD=%DATE:/=-%
set HHMMSS=%TIME:~0,8%
set HHMMSS=%HHMMSS: =0%
set HHMMSS=%HHMMSS::=-%
set FILENAME=%YYYYMMDD%_%HHMMSS%.png
"%ADB_CMD%" -s %DEVICE% shell screencap -p "/sdcard/%FILENAME%"
"%ADB_CMD%" -s %DEVICE% pull "/sdcard/%FILENAME%" "%~dp0%FILENAME%"
"%ADB_CMD%" -s %DEVICE% shell rm "/sdcard/%FILENAME%"

SET ADB_HOME=D:\Program Files\Nox\bin
set DEVICE=127.0.0.1:62001
この2行の自分の環境にあわせるだけだ