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AndyS19

WMI SQL query results object can only be used once

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I have code that does a WMI SQL query to find all defined printers, and I want to parse the returned object in several places.  However, after parsing it the first time, all other times fail to find any printer objects.

Here is my test code:

test()

Func test()
    Local $oPrinters, $oPrinter, $err, $cnt, $oP, $query

    $query = "SELECT * FROM Win32_Printer"
    $oPrinters = doQuery($query)

    $err = @error
    LogMsg("+++: $err = " & $err & ", isObj($oPrinters) = " & IsObj($oPrinters))

    If ($err == 0) Then

        LogMsg("FIRST LOOP") ; <=== FIRST LOOP
        $cnt = 0
        $oP = $oPrinters
        LogMsg("+++: isObj($oP) = " & IsObj($oP))

        For $oPrinter In $oP
            $cnt += 1
            LogMsg("+++: isObj($oPrinter): " & IsObj($oPrinter) & ", $oPrinter.Name ==>" & $oPrinter.Name & "<==")
        Next
        LogMsg("+++: Found " & $cnt & " printers")

        LogMsg("SECOND LOOP") ; <== SECOND LOOP
        $cnt = 0
        $oP = $oPrinters
        LogMsg("+++: isObj($oP) = " & IsObj($oP))

        For $oPrinter In $oP
            $cnt += 1
            LogMsg("+++: isObj($oPrinter): " & IsObj($oPrinter) & ", $oPrinter.Name ==>" & $oPrinter.Name & "<==")
        Next
        LogMsg("+++: Found " & $cnt & " printers")
    EndIf

EndFunc   ;==>test

Func doQuery($sQuery, $lnum = @ScriptLineNumber)
    #forceref $lnum
    LogMsg("+++:" & $lnum & ": doQuery(" & '"' & $sQuery & '"' & ") entered")
    Local $oWMIService, $oResults, $errstr
    Local $wbemFlags = BitOR(0x20, 0x10) ; $wbemFlagReturnImmediately and wbemFlagForwardOnly

    $oWMIService = ObjGet("winmgmts:\\" & "localhost" & "\root\CIMV2")

    If (IsObj($oWMIService)) Then

        $oResults = $oWMIService.ExecQuery($sQuery, "WQL", $wbemFlags)

        If (IsObj($oResults)) Then
            LogMsg("+++: doQuery() returns @error = 0, Good: returning the object")
            Return (SetError(0, 0, $oResults)) ;;; Good: return the object
        Else
            $errstr = "" _
                     & "WMI Query failed." & @CRLF _
                     & "This is the query:" & @CRLF _
                     & "   " & $sQuery
            LogMsg("+++: ====>" & $errstr & "<===")
            LogMsg("+++: doQuery() returns @error = 1")
            Return (SetError(1, 0, $errstr)) ; Error: Query faled
        EndIf
    Else
        $errstr = "" _
                 & "WMI Output" & @CRLF _
                 & "No WMI Objects Found for class: " & @CRLF _
                 & "Win32_PrinterDriver" & @CRLF _
                 & "using this query:" & @CRLF _
                 & "   " & $sQuery
        LogMsg("+++: ====>" & $errstr & "<===")
        MsgBox(0, "ERROR", $errstr) ; Error: Cannot get $oWMIService object
        Exit (1)
    EndIf
EndFunc   ;==>doQuery

Func LogMsg($msg, $lnum = @ScriptLineNumber)
    ConsoleWrite("+++:" & $lnum & ": " & $msg & @CRLF)
EndFunc   ;==>LogMsg

Parsing the returned $oPrinters object shows 5 printers:

+++:15: FIRST LOOP
+++:18: +++: isObj($oP) = 1
+++:22: +++: isObj($oPrinter): 1, $oPrinter.Name ==>Microsoft XPS Document Writer<==
+++:22: +++: isObj($oPrinter): 1, $oPrinter.Name ==>Microsoft Office Document Image Writer<==
+++:22: +++: isObj($oPrinter): 1, $oPrinter.Name ==>Fax<==
+++:22: +++: isObj($oPrinter): 1, $oPrinter.Name ==>Canon MG7100 series Printer WS<==
+++:22: +++: isObj($oPrinter): 1, $oPrinter.Name ==>Canon MG6100 series Printer WS<==
+++:24: +++: Found 5 printers

Parsing it again, shows no printers:

+++:26: SECOND LOOP
+++:29: +++: isObj($oP) = 1
+++:35: +++: Found 0 printers

 

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Maybe because the "cursor" is at the end of the resulting record set returned by the query.
You could try to loop throug $oP this way:

For $i = 1 to $oP.count
   ; Process $oP($i)
Next

 


My UDFs and Tutorials:

Spoiler

UDFs:
Active Directory (2018-12-03 - Version 1.4.11.0) - Download - General Help & Support - Example Scripts - Wiki
OutlookEX (NEW 2019-03-02 - Version 1.3.5.0) - Download - General Help & Support - Example Scripts - Wiki
Outlook Tools (2019-01-22 - Version 0.1.0.0) - Download - General Help & Support
ExcelChart (2017-07-21 - Version 0.4.0.1) - Download - General Help & Support - Example Scripts
PowerPoint (2017-06-06 - Version 0.0.5.0) - Download - General Help & Support
Excel - Example Scripts - Wiki
Word - Wiki
 
Tutorials:

ADO - Wiki

 

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When I try the following, 
$cnt = $oP.count

I get this error:
==> The requested action with this object has failed.:

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My UDFs and Tutorials:

Spoiler

UDFs:
Active Directory (2018-12-03 - Version 1.4.11.0) - Download - General Help & Support - Example Scripts - Wiki
OutlookEX (NEW 2019-03-02 - Version 1.3.5.0) - Download - General Help & Support - Example Scripts - Wiki
Outlook Tools (2019-01-22 - Version 0.1.0.0) - Download - General Help & Support
ExcelChart (2017-07-21 - Version 0.4.0.1) - Download - General Help & Support - Example Scripts
PowerPoint (2017-06-06 - Version 0.0.5.0) - Download - General Help & Support
Excel - Example Scripts - Wiki
Word - Wiki
 
Tutorials:

ADO - Wiki

 

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Right.  When I set the wbem flags to 0 (wait for complete) and went back to my original code, I was able to make multiple passes of the $oPrinters object.  However, no matter what I tried, I could not access one of the printer objects in $oPrinters using an index, like $oPrinters[2].

So it's fixed, thank you,

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:)


My UDFs and Tutorials:

Spoiler

UDFs:
Active Directory (2018-12-03 - Version 1.4.11.0) - Download - General Help & Support - Example Scripts - Wiki
OutlookEX (NEW 2019-03-02 - Version 1.3.5.0) - Download - General Help & Support - Example Scripts - Wiki
Outlook Tools (2019-01-22 - Version 0.1.0.0) - Download - General Help & Support
ExcelChart (2017-07-21 - Version 0.4.0.1) - Download - General Help & Support - Example Scripts
PowerPoint (2017-06-06 - Version 0.0.5.0) - Download - General Help & Support
Excel - Example Scripts - Wiki
Word - Wiki
 
Tutorials:

ADO - Wiki

 

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      Example 1:
      #RequireAdmin #include <array.au3> ; Get information on all available drives Global $test = _BitlockerDriveInfo() If @error Then ConsoleWrite("!> _BitlockerDriveInfo() error: " & @error & ". extended: " & @extended & @CRLF) ElseIf IsArray($test) Then _ArrayDisplay($test, "Bitlocker Drive Info", "", 64, Default, "Drive Letter|Drive Label|Volume Type|Initialized For Protection|Protection Status|Lock Status|Auto Unlock Enabled|Auto Unlock Key Stored|Conversion Status|Encryption Method|Encryption Percentage|Wiping Status|Wiping Percentage|Key Protectors") ; Display the Key Protectors for the first record If IsArray($test[0][13]) Then _ArrayDisplay($test[0][13]) EndIf Example 2:
      #RequireAdmin #include <array.au3> ; Get information on the C-drive of the current computer + show extra information in the console Global $test = _BitlockerDriveInfo("C:", @ComputerName, True) If @error Then ConsoleWrite("!> _BitlockerDriveInfo() error: " & @error & ". extended: " & @extended & @CRLF) ElseIf IsArray($test) Then ConsoleWrite("Bitlocker information on the " & $test[0][0] & " drive" & @CRLF) ConsoleWrite("Protection Status: " & $test[0][4] & @CRLF) EndIf  
      Screenshot for the first example:

       
      Suggestions? Bugs?
      Just let me know
       
      TODO:
      ???  
      Version 1.0:
      Initial release Version 1.1:
      Fixed: Drive Label will not work when you request the information from a remote system (currently using DriveGetLabel) Fixed: The current fix for the missing VolumeType property in some Windows versions will only work locally Added: New internal function (_WMIPropertyValue()) Version 1.2:
      Fixed: The drive exists & drive type check only worked locally when a drive was specified in $sDrive
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