Jump to content
Sign in to follow this  

Intermittent "Bad Variable Type" with Microsoft.XMLDOM

Recommended Posts

Hey, just wondering if anyone has ever encountered intermittent COM Object Errors with Microsoft.XMLDOM pulling node values. I'm currently getting "Bad Variable Type" intermittently, and simply running the script again would allow it to get further in the parsing loop, only to encounter the error again. The data is persistent, and it is always a string.

Here's a snippet of where the error event occurs

$Target = "Item001"
$SearchItem = $oXML.SelectNodes("//Items/Name[. = """&$Target&"""]")
If $SearchItem.Length==1 Then
    AddToLog("XML: Found a match for """&$Target&""", Gathering details...")
    $TargetItem = $SearchItem.Item(0).ParentNode
    $ItemSKU = XMLGetValue($TargetItem, "SKU")

and here's the snip of my XMLGetValue function where the error is always triggered on the $Value = ...

Func XMLGetValue($Node="", $ValueName="", $NestLevel=0)
    If $Node.GetElementsByTagName($ValueName).Item(0).ChildNodes.Length==1 Then
        $Value = $Node.GetElementsByTagName(String($ValueName)).Item(0).ChildNodes(0).NodeValue
        ...Tell me there are more than one result for the target

I added the string() as a counter measure but that doesnt fix the error. The XML file contains standard data with no attributes or anything funky.

The weird thing is that if i reboot my workstation it might get all the way through, and then if i run it again it may burp some where throughout the loop process (For each item, get SKU, Add SKU to array, Do stuff with array contents afterwards). 

I have added sleep timers to my loops to try and pace the XML requests in case it was a sort of buffer underrun issue but im not certain whats going on.


Again, i could run the script and it would work perfectly and then fail another time. I've read up about readyState, but i dont know how to incorporate it in my script.

Has anyone seen this before? Thanks in advance for your help.


Share this post

Link to post
Share on other sites

I've never had a problem as long as I never string together so many objects like that.  The script won't be as concise, but when you have error handling on every level, all goes well with the run.

IEbyXPATH-Grab IE DOM objects by XPATH IEscriptRecord-Makings of an IE script recorder ExcelFromXML-Create Excel docs without excel installed GetAllWindowControls-Output all control data on a given window.

Share this post

Link to post
Share on other sites
3 hours ago, jdelaney said:

I've never had a problem as long as I never string together so many objects like that.  The script won't be as concise, but when you have error handling on every level, all goes well with the run.

Ok, ill try breaking it down a bit further with additional checks and error handling.  Thats what my initial approach was for XMLGetValue; to simplify the process of retrieving values from nodes, but the complication comes in to place when some values are nested further down within the node than others. 

Share this post

Link to post
Share on other sites

Weird... i broke it right down and the error is popping up at this point


Win Description:    Bad variable type.
Number:     80020008

There's got to be an easier way of doing this...

Fixed: I read another thread you commented on and used that method of pulling text from a node. Replaced my whole XMLGetValue function with the snip below and it worked.



I was over complicating the approach simply because i'm a self taught programmer and used the MSDN documentation instead of simplified code samples. Happy i swallowed my pride and came here to ask for help.

Thanks again

Share this post

Link to post
Share on other sites
1 hour ago, SJF85 said:


i'm a self taught programmer and used the MSDN documentation

Me too.

Welome to the club :)


Signature beginning:   Wondering who uses AutoIt and what it can be used for ?
* GHAPI UDF - modest beginning - communication with GitHub REST API Forum Rules *
Include Dependency Tree (Tool for analyzing script relations)
ADO.au3 UDF     POP3.au3 UDF     XML.au3 UDF    How to use IE.au3  UDF with  AutoIt v3.3.14.x  for other useful stuff click the following button


Any of my own code posted anywhere on the forum is available for use by others without any restriction of any kind. 

My contribution (my own projects): * Debenu Quick PDF Library - UDF * Debenu PDF Viewer SDK - UDF * Acrobat Reader - ActiveX Viewer * UDF for PDFCreator v1.x.x * XZip - UDF * AppCompatFlags UDF * CrowdinAPI UDF * _WinMergeCompare2Files() * _JavaExceptionAdd() * _IsBeta() * Writing DPI Awareness App - workaround * _AutoIt_RequiredVersion() * Chilkatsoft.au3 UDF * TeamViewer.au3 UDF * JavaManagement UDF * VIES over SOAP * WinSCP UDF * GHAPI UDF - modest begining - comunication with GitHub REST APIErrorLog.au3 UDF - A logging Library *

My contribution to others projects or UDF based on  others projects: * _sql.au3 UDF  * POP3.au3 UDF *  RTF Printer - UDF * XML.au3 UDF * ADO.au3 UDF SMTP Mailer UDF * Dual Monitor resolution detection * * 2GUI on Dual Monitor System * _SciLexer.au3 UDF * SciTE - Lexer for console pane

Useful links: * Forum Rules * Forum etiquette *  Forum Information and FAQs * How to post code on the forum * AutoIt Online Documentation * AutoIt Online Beta Documentation * SciTE4AutoIt3 getting started * Convert text blocks to AutoIt code * Games made in Autoit * Programming related sites * Polish AutoIt Tutorial * DllCall Code Generator * 

Wiki: Expand your knowledge - AutoIt Wiki * Collection of User Defined Functions * How to use HelpFile * Good coding practices in AutoIt * 

OpenOffice/LibreOffice/XLS Related: WriterDemo.au3 * XLS/MDB from scratch with ADOX

IE Related:  * How to use IE.au3  UDF with  AutoIt v3.3.14.x * Why isn't Autoit able to click a Javascript Dialog? * Clicking javascript button with no ID * IE document >> save as MHT file * IETab Switcher (by LarsJ ) * HTML Entities * _IEquerySelectorAll() (by uncommon) * IE in TaskSchedulerIE Embedded Control Versioning (use IE9+ and HTML5 in a GUI) *

PDF Related:How to get reference to PDF object embeded in IE *

I encourage you to read: * Global Vars * Best Coding Practices * Please explain code used in Help file for several File functions * OOP-like approach in AutoIt * UDF-Spec Questions *  EXAMPLE: How To Catch ConsoleWrite() output to a file or to CMD *

I also encourage you to check awesome @trancexx code:  * Create COM objects from modules without any demand on user to register anything. * Another COM object registering stuffOnHungApp handlerAvoid "AutoIt Error" message box in unknown errors  * HTML editor

"Homo sum; humani nil a me alienum puto" - Publius Terentius Afer
"Program are meant to be read by humans and only incidentally for computers and execute" - Donald Knuth, "The Art of Computer Programming"
:naughty:  :ranting:, be  :) and       \\//_.

Anticipating Errors :  "Any program that accepts data from a user must include code to validate that data before sending it to the data store. You cannot rely on the data store, ...., or even your programming language to notify you of problems. You must check every byte entered by your users, making sure that data is the correct type for its field and that required fields are not empty."

Signature last update: 2021-01-03

Share this post

Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Sign in to follow this  

  • Recently Browsing   0 members

    No registered users viewing this page.

  • Similar Content

    • By Ascer
      A couple week ago i've started learning API Interface for different websites. In this fact sometimes you have to encode your "photo" or "document.body" to send request.
      Functions to encode and decode Base64 was already created by others. Unfortunately i have troubles with running it on Windows R 2008, also speed was terrible.
      I try to find alternative way to code data. 
      I've read about Microsoft "XMLDOM" and created a one simple function to Encode / Decode data to base64binary, base64url
      Thanks for Ghads on Wordpress i coverted a part of his lines from VBscript to AutoIT
      ;============================================================================================================================== ; Function: base64($vCode [, $bEncode = True [, $bUrl = False]]) ; ; Description: Decode or Encode $vData using Microsoft.XMLDOM to Base64Binary or Base64Url. ; IMPORTANT! Encoded base64url is without @LF after 72 lines. Some websites may require this. ; ; Parameter(s): $vData - string or integer | Data to encode or decode. ; $bEncode - boolean | True - encode, False - decode. ; $bUrl - boolean | True - output is will decoded or encoded using base64url shema. ; ; Return Value(s): On Success - Returns output data ; On Failure - Returns 1 - Failed to create object. ; ; Author (s): (Ghads on Wordpress.com), Ascer ;=============================================================================================================================== Func base64($vCode, $bEncode = True, $bUrl = False) Local $oDM = ObjCreate("Microsoft.XMLDOM") If Not IsObj($oDM) Then Return SetError(1, 0, 1) Local $oEL = $oDM.createElement("Tmp") $oEL.DataType = "bin.base64" If $bEncode then $oEL.NodeTypedValue = Binary($vCode) If Not $bUrl Then Return $oEL.Text Return StringReplace(StringReplace(StringReplace($oEL.Text, "+", "-"),"/", "_"), @LF, "") Else If $bUrl Then $vCode = StringReplace(StringReplace($vCode, "-", "+"), "_", "/") $oEL.Text = $vCode Return $oEL.NodeTypedValue EndIf EndFunc ;==>base64  
    • By dynamitemedia
      i have the following snippet...   now its working but i have it inside a function and want to be able to use   $aThumb[$i]  outside the function in the rest of the script, i tried return and keep getting this error  "Invalid keyword at the start of this line.:"  
      Global $iRows = UBound($a, $UBOUND_ROWS) Global $iCols = UBound($a, $UBOUND_COLUMNS) $oID = $oID + 1 $oURL = $oString.selectSingleNode("./url") $oName = $oString.selectSingleNode("./name") $oCategory = $oString.selectSingleNode("./category") $oThumb = $oString.selectSingleNode("./image") $oLanguage = $oString.selectSingleNode("./language") $aThumb = [$iRows] _ArrayAdd($aThumb, $oThumb.text) For $i = 1 To UBound($aThumb) - 1 ConsoleWrite($oID & @TAB & $aThumb[$i] & @CRLF) Next Next ConsoleWrite( "rows: " & $iRows & @CRLF) Thanks for your help
    • By gillesg
      Hi All,

      I Am trying to update field in a xml file ("iTunesPrefs.xml" see attach)
      To do so, I try to use XMLDOM (link : )
      So far I am unsuccesfull.

      Here is the code I came up to, and I am stuck.

      #Include <File.au3> #Include <Array.au3> #include "_XMLDomWrapper.au3" $DirInput =@TempDir $FileInput = "iTunesPrefs.xml" $sXmlFile =$DirInput & "\" & $FileInput $iOXml = _XMLFileOpen($sXmlFile) $XmlRootPath = "//plist/dict" Local $i_Nodes = _XMLGetNodeCount ( $XmlRootPath) msgbox(0,"","nb node = " & $i_Nodes) If $i_Nodes > 0 Then Local $sRet = _XMLGetChildNodes ( $XmlRootPath) $i_nodes=$sRet[0] msgbox(0,"","nb node = " & $i_Nodes) Local $nodeIndex, $key[$i_Nodes], $value[$i_nodes], $z If IsArray($sRet) Then _ArrayDisplay($sRet,"Node Names with _XMLGetChildNodes") $aArr = _XMLGetField ($XmlRootPath) _arraydisplay($aArr) For $nodeIndex = 1 To $sRet[0] $key[$nodeIndex - 1] = _RetFirst(_XMLGetField ($XmlRootPath & "[" & $nodeIndex & "]")) $value[$nodeIndex - 1] = "<" &$sRet[$nodeIndex] & ">" & _RetFirst(_XMLGetField ($XmlRootPath & "[" & $nodeIndex & "]")) Next _ArrayDisplay($key, "Key") _ArrayDisplay($Value, "Value") EndIf EndIf Exit ;=============================================================================== ;Funcs ;=============================================================================== Func _RetFirst($aArray); return first item in an array If IsArray($aArray) Then if $aArray[0] >=1 then Return $aArray[1] Else Return $aArray[0] EndIf EndIf EndFunc ;==>_RetFirst
      I want to navigate thru each XML node and manipulate its Xml Tag Name and value.
      Especialy I want to update the Value of the Data field after the "<key>iTunes Library XML Location:1</key>"

      Can anyone give me some hints or advices ? I am lost.

  • Create New...