Vista - Exec Method Puzzle

Below is a stripped down version of a script I've been working on. It works
as expected when invoked with cscript.exe: It executes the nominated batch
file:

Set oFSO = CreateObject("Scripting.FileSystemObject")
Set oWshShell = CreateObject("WScript.Shell")
sTemp = oWshShell.ExpandEnvironmentStrings("%Temp%\TempBat.bat")
Set oBatchFile = oFSO.CreateTextFile(sTemp, True)
oBatchFile.WriteLine "echo %date% %time% >> c:\test.txt"
oBatchFile.Close
Set oExec = oWshShell.exec(sTemp)
WScript.Sleep 1000

If I remove the Sleep method at the end then the script does not appear to
do anything. It runs but it does not generate an entry in the log file. The
real batch file contains several meaningful commands - none of them are
executed.

Could someone explain what difference the Sleep method makes?

On Jul 16, 9:40*am, "Pegasus [MVP]" <n...@xxxxxx> wrote:Without the Sleep, the calling script exits (clearing the oExec
object) before the underlying batch procedure can complete its
execution.

Note that the documentation illustrates the need to wait until the
Status property becomes 1. Therefore, a proper implementation would
be something like this ...

Set oFSO = CreateObject("Scripting.FileSystemObject")
Set oWshShell = CreateObject("WScript.Shell")
sTemp = oWshShell.ExpandEnvironmentStrings("%Temp%\TempBat.bat")
Set oBatchFile = oFSO.CreateTextFile(sTemp, True)
oBatchFile.WriteLine "echo %date% %time% >> c:\test.txt"
oBatchFile.Close
Set oExec = oWshShell.exec(sTemp)
Do Until oExec.Status <> 0
WScript.Sleep 50
Loop

Tom Lavedas
***********

"Tom Lavedas" <tglbatch@xxxxxx> wrote in message
news:70b00bbe-7e36-416d-a8fa-4ab87724d11f@xxxxxx
On Jul 16, 9:40 am, "Pegasus [MVP]" <n...@xxxxxx> wrote:Without the Sleep, the calling script exits (clearing the oExec
object) before the underlying batch procedure can complete its
execution.

Note that the documentation illustrates the need to wait until the
Status property becomes 1. Therefore, a proper implementation would
be something like this ...

Set oFSO = CreateObject("Scripting.FileSystemObject")
Set oWshShell = CreateObject("WScript.Shell")
sTemp = oWshShell.ExpandEnvironmentStrings("%Temp%\TempBat.bat")
Set oBatchFile = oFSO.CreateTextFile(sTemp, True)
oBatchFile.WriteLine "echo %date% %time% >> c:\test.txt"
oBatchFile.Close
Set oExec = oWshShell.exec(sTemp)
Do Until oExec.Status <> 0
WScript.Sleep 50
Loop

Tom Lavedas
***********

Thanks for your prompt reply. The documentation in script56.chm does
illustrate the wait loop but unfortunately it never explains the reason for
its existence. Your response makes it clear why the loop must be there.

On Jul 16, 11:56*am, "Pegasus [MVP]" <n...@xxxxxx> wrote:{snip}Yes, the documentation leaves a lot to be desired in some respects.

Glad I could help.

Tom Lavedas

It's often the case that things are better after a good sleep

--

Joe Fawcett (MVP - XML)
http://joe.fawcett.name

"Pegasus [MVP]" <news@xxxxxx> wrote in message
news:OumV5rhBKHA.4608@xxxxxx

"Joe Fawcett" <joefawcett@xxxxxx> wrote in message
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