vbscript - WScript.Shell.Exec-从标准输出读取输出

Question

我的VBScript不显示我执行的任何命令的结果。我知道命令已执行，但我想捕获结果。

我已经测试了执行此操作的多种方法，例如:

Const WshFinished = 1
Const WshFailed = 2
strCommand = "ping.exe 127.0.0.1"

Set WshShell = CreateObject("WScript.Shell")
Set WshShellExec = WshShell.Exec(strCommand)

Select Case WshShellExec.Status
   Case WshFinished
       strOutput = WshShellExec.StdOut.ReadAll
   Case WshFailed
       strOutput = WshShellExec.StdErr.ReadAll
 End Select

WScript.StdOut.Write strOutput  'write results to the command line
WScript.Echo strOutput          'write results to default output

但是它不会打印任何结果。如何捕获 StdOut和 StdErr？

Answer 1

WScript.Shell.Exec()立即返回 ，即使它启动的过程没有。如果您尝试立即阅读Status或StdOut，那么那里什么也没有。

MSDN documentation建议使用以下循环:

Do While oExec.Status = 0
     WScript.Sleep 100
Loop

这会每100毫秒检查一次 Status，直到它更改为止。本质上，您必须等待该过程完成，然后才能读取输出。

只需对代码进行一些小的更改，即可正常工作:

Const WshRunning = 0
Const WshFinished = 1
Const WshFailed = 2
strCommand = "ping.exe 127.0.0.1"

Set WshShell = CreateObject("WScript.Shell")
Set WshShellExec = WshShell.Exec(strCommand)

Do While WshShellExec.Status = WshRunning
     WScript.Sleep 100
Loop

Select Case WshShellExec.Status
   Case WshFinished
       strOutput = WshShellExec.StdOut.ReadAll()
   Case WshFailed
       strOutput = WshShellExec.StdErr.ReadAll()
 End Select

WScript.StdOut.Write(strOutput)  'write results to the command line
WScript.Echo(strOutput)          'write results to default output