从 VBScript 中的 cmd/c 命令获取返回值 [英] Getting the return value from a cmd /c command in VBScript

问题描述

在 VBScript 中，内置的 Shell.Run 方法不提供输出重定向，因此必须使用以下解决方法:

In VBScript, the built-in Shell.Run method does not provide for output redirection, so the following workaround must be used:

使用 VbScript 静默运行命令行并获取输出?

Dim retVal
retVal = WshShell.Run( "cmd /c ""commandGoesHere"" > c:\temp\output.txt", 0, True )

然而，returnValue 将具有 cmd 的返回值，而不是 commandGoesHere 的返回值.

However returnValue will have the return value of cmd, not of commandGoesHere.

我以为我可以检查 shell.Environment("ERRORLEVEL") 但大概这也是 cmd 的返回值，而不是 commandGoesHere.

I thought I could check shell.Environment("ERRORLEVEL") but presumably this would also be cmd's return value, and not commandGoesHere.

...那么我怎样才能获得 commandGoesHere 的返回值和同时将其输出重定向到另一个文件?

...so how can I get commandGoesHere's return value and simultaneously redirect its output to another file?

推荐答案

returnValue = WScript.CreateObject("WScript.Shell").Run( _ 
    "cmd /v /c (>""output.txt"" ""commandGoesHere"" & exit !errorlevel!)" _ 
    , 0 _ 
    , True _ 
)

启动 cmd 实例并启用延迟扩展 (/v) 并退出 cmd 实例并带有 errorlevel 由上一个命令设置.

Start the cmd instance with delayed expansion enabled (/v) and exit the cmd instance with the errorlevel set by the previous command.

需要延迟扩展，因为 cmd 解析器在行/块解析阶段用变量内部的值替换所有 %var% 读取操作.在没有延迟扩展(%errorlevel%)的情况下，exit 命令返回的值将在开始执行命令之前被检索.使用延迟扩展 (!errorlevel!)，在 commandGoesHere 结束后，执行 exit 命令时将检索该值.

Delayed expansion is needed because the cmd parser replaces all %var% read operations with the value inside the variables during the line/block parse phase. Without delayed expansion (%errorlevel%), the value to be returned by the exit command will be retrived before starting to execute the command. With delayed expansion (!errorlevel!) the value will be retrieved when the exit command is executed, after the commandGoesHere has ended.

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