WScript.Shell.Exec - 从stdout读取输出

Question

我的VBScript没有显示我执行的任何命令的结果.我知道命令被执行但我想捕获结果.

我已经测试了很多方法,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

但它不打印任何结果.如何捕捉StdOut和StdErr？

Answer 1

WScript.Shell.Exec()立即返回,即使它启动的进程没有.如果您尝试阅读Status或StdOut立即阅读,那里将不会有任何内容.

在MSDN文档建议使用下面的循环:

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

Status每100毫秒检查一次,直到它发生变化.基本上,您必须等到该过程完成,然后您才能读取输出.

通过对代码进行一些小的更改,它可以正常工作:

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