PowerShell的保存标准输出和显示标准输出

Question

我使用PowerShell来发动所谓的GoodSync一个应用程序为我进行备份。在这个过程结束时，我会通过电子邮件向我发送结果。我还喜欢（有时）观看PowerShell窗口以关注它并在处理备份时观察备份的状态。正如我的代码现在，标准输出将控制台，就是这样。

我的问题：是否有可能让stdout转到控制台，并将其保存到变量以备后续处理？

你可以看到我试图用$输出变量的东西，但一事无成。这里的错误$输出返回：

You cannot call a method on a null-valued expression. 
At GoodSync.ps1:119 char:42 
+  $output = $proc.StandardOutput.ReadToEnd <<<<() 
    + CategoryInfo   : InvalidOperation: (ReadToEnd:String) [], Runtime 
    Exception 
    + FullyQualifiedErrorId : InvokeMethodOnNull 

You cannot call a method on a null-valued expression. 
At GoodSync.ps1:120 char:42 
+  $output += $proc.StandardError.ReadToEnd <<<<() 
    + CategoryInfo   : InvalidOperation: (ReadToEnd:String) [], Runtime 
    Exception 
    + FullyQualifiedErrorId : InvokeMethodOnNull 

这里是我的代码：

（而且是从你大师那里一点点积极的，是的，我做了很多与此代码输出到这两个文件和stdout，所以我可以保持眼睛上的一切。这部分只是整个文件的片段。）

############################### 
## Call the GoodSync process ## 
############################### 

# This is the section taken from http://*.com/questions/8925323 
# This is a known working section. However, right now I don't know how to save the stdout to variable and insert into email log file. 
$procInfo = New-Object System.Diagnostics.ProcessStartInfo 
$procInfo.FileName = "C:\Program Files\Siber Systems\GoodSync\gsync.exe" 
$procInfo.UseShellExecute = $false 
$procInfo.Arguments = '/progress=yes /exit sync MyBackupJobName' 
$proc = New-Object System.Diagnostics.Process 
$proc.StartInfo = $procInfo 
$proc.Start() | Out-Host 
(Get-Date -format T) + " - Loaded gsync.exe. Backup process running. Please stand by..." | Tee-Object -Variable RoboLog 
$RoboLog >> $myLogFile 
"" | Tee-Object -Variable RoboLog 
$RoboLog >> $myLogFile 
$proc.WaitForExit() 
(Get-Date -format T) + " - Backup complete and gsync.exe has exited." | Tee-Object -Variable RoboLog 
$RoboLog >> $myLogFile 
"" | Tee-Object -Variable RoboLog 
$RoboLog >> $myLogFile 

# Now we take the exit code, write it to console and log file, and begin to build our email report. 
if ($proc.ExitCode -eq 0) { 
    "Success: GoodSync Reported: Analyze or Sync Successfully Completed." | Tee-Object -Variable RoboLog 
    $RoboLog >> $myLogFile 
    $subject = $RoboLog 
    "" | Tee-Object -Variable RoboLog 
    $RoboLog >> $myLogFile 
} elseif ($proc.ExitCode -eq 1) { 
    "Failure: GoodSync Error: Analyze had Terminal Errors. Did gsync.exe close abruptly?" | Tee-Object -Variable RoboLog 
    $RoboLog >> $myLogFile 
    $subject = $RoboLog 
    "" | Tee-Object -Variable RoboLog 
    $RoboLog >> $myLogFile 
} elseif ($proc.ExitCode -eq 2) { 
    "Failure: GoodSync Error: Sync had Terminal Errors. Did gsync.exe close abruptly?" | Tee-Object -Variable RoboLog 
    $RoboLog >> $myLogFile 
    $subject = $RoboLog 
    "" | Tee-Object -Variable RoboLog 
    $RoboLog >> $myLogFile 
} else { 
    "Failure: GoodSync Error: General Error. Check log file." | Tee-Object -Variable RoboLog 
    $RoboLog >> $myLogFile 
    $subject = $RoboLog 
    "" | Tee-Object -Variable RoboLog 
    $RoboLog >> $myLogFile 
} 

# Grab the stdout and stderr to a variable 
$output = $proc.StandardOutput.ReadToEnd() 
$output += $proc.StandardError.ReadToEnd() 
# The ReadToEnd() makes everything 1 long string, so we break it up by carriage return, and filter 
$output -split "`n" 
# Write to log file for email capture 
$output >> $myLogFile 

"" | Tee-Object -Variable RoboLog 
$RoboLog >> $myLogFile 

#--------------------------------------------------------------------------------------------------- 
# GoodSync backup jobs are now complete. 
#--------------------------------------------------------------------------------------------------- 

Answer 1

从$proc.StandardOutput.ReadToEnd（You cannot call a method on a null-valued expression.）中的错误是因为你需要设置的这些属性ProcessStartInfo对象：

$procInfo.RedirectStandardError = $true 
$procInfo.RedirectStandardOutput = $true 

注 - 设置这些时，输出将不被显示在控制台上。

而且这里有一个方法来存储输出变量并在控制台上显示它使用Tee-Object：

& ping.exe localhost -n 1 | Tee-Object -Variable output 
$output 

顺便说一句 - 您可以在$LASTEXITCODE做一个开关 - 例如

switch ($LASTEXITCODE) { 
    0 {'good'} 
    1 {'bad'} 
    2 {'ugly'} 
} 

Answer 2

为什么不把它作为后台工作来运行？然后你可以使用接收-工作得到输出（多次，只要你想，如果你使用 - 保持，并且做任何你想做的事情。