连接失败时如何打破循环？

Question

我正在研究ping批处理程序。 我想学的是如何在连接断开时跳过循环？ 举个例子：

@echo off
:1
ping www.stackoverflow.com
(I guess) if errorlevel 1 set errorlev=1
If errorlevel 1 goto 2
goto 1
:2
Echo ping failed!
Title ping failed!
color c

Answer 1

你可以试试这个：

:back
ping www.stackoverflow.com >nul && goto:back
Echo ping failed!

Answer 2

所以你想永远ping，直到ping失败，然后停止？

@echo off
:1
ping -n 1 www.stackoverflow.com | find "Reply from">nul2>nul && goto :1
echo ping failed!
title ping failed!
color c

注意：我试图找到而不是检查ERRORLEVEL，因为某些Windows版本与某些故障条件设置ERRORLEVEL不一致。请参阅以下示例。

C:\Users\Me>ping -n 1 192.168.1.2

Pinging 192.168.1.2 with 32 bytes of data:
Reply from 192.168.1.102: Destination host unreachable.

Ping statistics for 192.168.1.2:
    Packets: Sent = 1, Received = 1, Lost = 0 (0% loss),

C:\Users\Me>echo %errorlevel%
0