batch-file - 连接失败时如何打破循环？

Question

我正在开发一个 ping 批处理程序。我想学习的是当连接失效时如何跳过循环？例如：

@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：我通过管道查找而不是检查 ERRORLEVEL，因为某些 Windows 版本与为某些故障条件设置 ERRORLEVEL 不一致。请参见下面的示例。

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