如果位于.bat文件中，则％errorlevel％在嵌套中的值错误 [英] wrong value of %errorlevel% in nested if in .bat file

问题描述

我已经编写了一个 .bat 文件来首先运行一个程序，如果正确完成，我将运行另一个程序并检查其返回值.

I have written a .bat file to first run a program, if it is correctly finished I run another program and check return value of it.

first-program.exe
IF "%ERRORLEVEL%"=="0" (
    second-program.exe
    IF "%ERRORLEVEL%"=="0" (
        ECHO OK
    ) ELSE (
        ECHO NOK
    )
)

但是第二个％ERRORLEVEL％始终等于第一个，它没有设置为 second-program.exe 的返回值.

However the second %ERRORLEVEL% is always equal to first, it doesn't set to the return value of second-program.exe.

推荐答案

％ERRORLEVEL％的两个实例都在同一代码块中，因此 both 都获得了它们的值在更新第一个实例时.考虑使用 enabledelayedexpansion 启用变量的延迟扩展，并用！ERRORLEVEL！替换％ERRORLEVEL％以分别更新每个实例.例如:

Both instances of %ERRORLEVEL% are in the same block of code and thus both get their values at the moment when the first instance is updated. Consider enabling delayed expansion of variables with enabledelayedexpansion and replacing %ERRORLEVEL% with !ERRORLEVEL! to update each instance individually. For instance:

@echo off
setlocal enabledelayedexpansion
first-program.exe
IF "!ERRORLEVEL!"=="0" (
    second-program.exe
    IF "!ERRORLEVEL!"=="0" (
        ECHO OK
    ) ELSE (
        ECHO NOK
    )
)
endlocal

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