无法将 "System.Reflection.Missing" 类型的 "System.Reflection.Missing" 值转换为 "System.Int32" 类型。 - PowerShell PPT打印

Question

我试图在 PowerPoint 中为 .printout 输入 default/null/missing 值，但我无法让它工作。 The value's that are giving me troubles are defined as integers in this page.

通常我可以使用 [System.Type]::Missing 或 '' 但这些都不起作用，我得到以下结果：

Cannot convert the "System.Reflection.Missing" value of type "System.Reflection.Missing" to type "System.Int32".

如何为 PowerPoint 的 .printout 的那两个参数输入空值？

这是我到目前为止的代码：

###PPT
IF ($FILETYPE -eq "PPT") {
 ECHO "PPT_FOUND"

 $msoFalse = [Microsoft.Office.Core.MsoTriState]::msoFalse
 $msoTrue = [Microsoft.Office.Core.MsoTriState]::msoTrue

 $ObjPPT = New-Object -comobject PowerPoint.Application
 $ObjPPT.Visible  = $msoTrue
 #$ObjPPT.DisplayAlerts = $msoFalse 
 #Exception setting "DisplayAlerts": "Cannot convert value "msoFalse" to type "Microsoft.Office.Interop.PowerPoint.PpAlertLevel" due to enumeration values that are not valid. Specify one of the following 
 #enumeration values and try again. The possible enumeration values are "ppAlertsNone,ppAlertsAll"."
 
 #.Open
 $FILENAME = $FILEPATH
 IF (!$ReadOnly){$ReadOnly = $msoTrue}
 IF (!$Untitled){$Untitled = $missing}
 IF ((!$WithWindow) -and ($OPENUI -eq "FALSE")){$WithWindow = $msoFalse} ELSE {$WithWindow = $msoTrue}
 $ObjPresentation=$ObjPPT.Presentations.open($FILENAME,$ReadOnly,$Untitled,$WithWindow)

 #.Print
 #.PrintOut (From[Integer], To[Integer], PrintToFile[String], Copies [Integer], Collate[Bool]{msoTrue/False}) 
 IF (!$From){[int]$From = $missing}
 IF (!$To){[int]$To = $missing}
 IF (!$PrintToFile){[string]$PrintToFile = $missing}
 #Copies Defined Earlier
 IF (!$Collate){$Collate = $msoTrue}
 #$ObjPresentation.printout($From,$To,$PrintToFile,$COPIES,$Collate)
 $ObjPresentation.printout($From,$To)# , ,$COPIES,$Collate)

 #All Done
 Sleep 2
 $ObjPresentation.Close()
 $ObjPPT.Quit()
 Do-CloseIfRunning -Process $PROCESS
}

[gc]::collect()
[gc]::WaitForPendingFinalizers()

#Get-Variable
#PAUSE

Answer 1

原来使用 0 导致了错误，但是使用 -1 作为 From/To 值按预期工作（空值）。

无法将 "System.Reflection.Missing" 类型的 "System.Reflection.Missing" 值转换为 "System.Int32" 类型。 - PowerShell PPT打印

Cannot convert the "System.Reflection.Missing" value of type "System.Reflection.Missing" to type "System.Int32". - PowerShell PPT Printing

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