problem with: COM method with structures as arguments

2 posts in this topic


I am trying to write very basic script to use COM object. It is a specific object allowed to communication with software on the industrial controller.

I can create reference to a COM object by function ObjCreate. Thanks to ObjectName function I can read all information about object. Problem is that, I can trigger (only) one method of this object, named Disconnect().

When I want to use the other method instead of Disconnect(), for example, ReadValueN I have problem with arguments for this method. I tryed many variants, combinations, without positive result. My error monitoring function (for COM errors) reports: "Bad variable types" or "Type mismath".

I studied many examples, many documentations but I have no idea how it should be.

Below is description for method, data etc based on OLE/ COM Object Viewer.

long ReadValueN(

     [in] long TARGET_id,

     [in] PARAM_DEF* pParamDef,

     [out] BUFFER* pResBuffer);
typedef struct tagPARAM_DEF{

     unsigned char Param1;

     unsigned char Param2;

     unsigned char Param3;

     unsigned char ParamT[8];

     short Number;

     unsigned char ValueF;

     unsigned char ValueD;


typedef struct tagBUFFER{

     unsigned char BuffA1;

     unsigned char BuffA2;

     unsigned char BuffA3;

     unsigned char BuffTable[256];

$structParamDef = DllStructCreate("byte; byte; byte; byte[8]; short; byte; byte")
$structBuffer = DllStructCreate("byte; byte; byte; byte[256]")

$response = $myObject.ReadValueN(0, DllStructGetPtr($structParamDef), DllStructGetPtr($structBuffer))

;$response = $myObject.Disconnect() ; is working

Could someone write me what is wrong and how it should be? And especially - why?

thanks in advanced

Share this post

Link to post
Share on other sites

If you provide referency for the object you're using maybe should be easy to help you.




venezuela.png Would you like to say thank to Danyfirex using a warmy way?  offer me a cup of coffee... coffee.png





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

  • Similar Content

    • InunoTaishou
      By InunoTaishou
      Struggling a bit to get this GDI+ function converted to AutoIt.
      #include <GDIPlus.au3> _GDIPlus_Startup() Global $hImage = _GDIPlus_ImageLoadFromFile("F:\DCIM\Camera\20170515_111804.jpg") Global $tBufferSize = DllStructCreate("uint") Global $tProperties = DllStructCreate("uint") _GDIPlus_GetPropertySize($hImage, $tBufferSize, $tProperties) Global $tAllItems = DllStructCreate("struct;char[" & DllStructGetData($tBufferSize, 1) & "];endstruct") _GDIPlus_GetAllPropertyItems($hImage, $tBufferSize, $tProperties, $tPropertyItem) _GDIPlus_ImageDispose($hImage) _GDIPlus_Shutdown() Func _GDIPlus_GetAllPropertyItems(ByRef $hImage, Const $tTotalBufferSize, Const $tNumProperties, ByRef $tAllItems) If (Not IsDllStruct($tPropertyItem)) Then Return SetError(-1, 0, "") Local $aResult = DllCall($__g_hGDIPDll, "int", "GdipGetAllPropertyItems", "hwnd", $hImage, "unit", DllStructGetData($tTotalBufferSize, 1), "uint", DllStructGetData($tNumProperties, 1), "ptr", DllStructGetPtr($tAllItems)) If (@error) Then Return SetError(@error, @extended, ConsoleWrite("@Error = " & @error & @LF)) If ($aResult[0]) Then Return SetError($aResult[0], @extended, "") Return $aResult[0] EndFunc ;==>_GDIPlus_GetAllPropertyItems Func _GDIPlus_GetPropertySize(Const ByRef $hImage, ByRef $tTotalBufferSize, ByRef $tNumProperties) If (Not IsDllStruct($tTotalBufferSize)) Then Return SetError(-1, 0, "") If (Not IsDllStruct($tNumProperties)) Then Return SetError(-2, 0, "") Local $aResult = DllCall($__g_hGDIPDll, "uint", "GdipGetPropertySize", "hwnd", $hImage, "uint_ptr", DllStructGetPtr($tTotalBufferSize), "uint_ptr", DllStructGetPtr($tNumProperties)) If (@error) Then Return SetError(@error, @extended, "") If ($aResult[0]) Then Return SetError($aResult[0], 0, "") Return $aResult[0] EndFunc ;==>_GDIPlus_GetPropertySize Got the GetPropertySize function to work, gives me the correct buffer size and the property count, but I cannot figure out how to get the struct for the all items.
      Function on MSDN:
      Struct needed:
      PropertyItem class:
      Found other topics about this function in other languages where they used a blank string as the buffer, so I tried using a char array, which doesn't work. Just cannot figure out how to create the struct buffer to hold the data.
    • zetaimmersion
      By zetaimmersion
      Hi all. 
      I am trying to do 2 things but i cannot seem to get any traction on how to read/implement this idea.
      Premise: PowerPoint file in C\temp\presentation.pptx that contains on the first slide 2 entries as "<one>" and "<two>" which need to be replaced with "user1" and "user2", then a silent Outlook send mail containing the file with a predefined body and subject.
      I narrowed it down to COM objects as the Office does not like intrusive open AutoIt functions. I installed OLE/COM Object Viewer to understand how to create the commands but i am still stuck. So far i am trying to user water's code but i suck
      COM object i was originally trying to modify
      Dim $oPPT, $oPres $oPPT = ObjCreate("PowerPoint.Application") $oPPT.Visible = True $oPres = $oPPT.Presentations.Read Water's code below (0.1% modified)
      #include <File.au3> #include "PowerPoint.au3" #include <misc.au3> Global $sFile = "C:\temp\presentation.pptx" Global $sString2Search = "<username>", $sString2Replace = "Password", $iReplaceOnce = 1, $sFullLogFile = "C:\temp\pptxlog.txt" _ProcessPpt($sFile) Func _ProcessPpt($sFile) $oApp = _PPT_PowerPointApp() Local $bChange = False Local $oInterface = $oApp.Presentations Local $oPresentation = $oInterface.Open($sFile, False, False, False) If @error Then _FileWriteLog($sFullLogFile, "E Error " & @error & " opening File " & $sFile) Return SetError(1, 0, 0) EndIf ;it does not even open my file and from here not sure how to read the text and replace it EndFunc ;==>_ProcessPpt  
    • YellowLab
      By YellowLab
      I am having a very unique, but repeatable problem with ImageMagick COM interface. Here are the applicable lines of code:
      and then later on...
      $oIM.Convert(String($arFileList[$nFileIndex])&'[0]',"-alpha", "remove",@TempDir&"\temp.jpg")
      the array points to a pdf file with the "convert" command converting the first page of the pdf to a jpg with any alpha layer removed.
      Every time, without fail, the first time I run the script on a freshly booted machine it crashes on the $oIM.Convert command. It does this if it isn't compiled and says there is an error executing the command on the object. If compiled, i get an error that autoit has stopped responding. Anytime I run the script, compiled or not, after this initial crash everything works perfectly fine.
      I am totally at a loss as to why this is occurring and how to correct it.
    • Javik
      By Javik
      Is there a way to read data directly from the Windows Component Object Model (COM) interface?
      I am trying to make a really simple disk space reporter tool for accounts on an Active Directory domain, to read the disk quota limit for the logged on user's home directory, and report how much disk space they are currently using.
      MSDN:  IDiskQuotaUser interface
    • WoodGrain
      By WoodGrain
      Hi All,
      I've coded the small script below, but it can't seem to get the instance of Windows Media player as it keeps going to @error, I've not used com objects before so any assistance would be appreciate. I already have WMP open and minimised. I retrieved "WMPlayerApp" from the AutoIT info tool, I've included a copy below.
      I'm using these sources:
      $oWMP = ObjGet("", "WMPlayerApp") If @error Then MsgBox(0, "Can't get WMP", "Couldn't connect to the WMP instance") Exit EndIf $wmpPlayState = $oWMP.playState MsgBox(0, "Play State", $wmpPlayState) $wmpSongName = $oWMP.currentMedia.name MsgBox(0, "Play State", $wmpSongName) I've also seen references to the below, but I want to get an existing open WMP:
      ObjCreate("wmplayer.OCX") and have looked at the WMP.udf but can't see how it will do either of the functions I've coded above.