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Object Item not exists, how to catch error?


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Hi,

when i try to access an object item, i get an error, but don't know how to catch this error:

 

Func GetFirewallRule($sName)
    Local $oPolicy = ObjCreate("HNetCfg.FwPolicy2")

    MsgBox(0, "test", $oPolicy.Rules.Item($sName)) ; throws error: The requested action with this object has failed.

EndFunc

Thanks in advance

Edited by Trolleule
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Func GetFirewallRule($sName)
    Local $oPolicy = ObjCreate("HNetCfg.FwPolicy2")
       If IsObj($oPolicy) Then
          MsgBox(0, "test", $oPolicy.Rules.Item($sName)) ; throws error: The requested action with this object has failed.
       Else
          ;Do Something Else
       EndIf
EndFunc

Hi, @Trolleule Look at IsObj in the help file.

Edited by JLogan3o13

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Thanks...but it's not as easy as you think :D 

The problem, is that 

$oPolicy.Rules ; is always ok, but
$oPolicy.Rules.Item("Test") ; will throw error, if rule with name "Test" not exists

I already tried:

$oPolicy.Rules.Exists("Test")

but this property is not known in this context :(

Any ideas?

 

Edited by Trolleule
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When you are using .....Item()

then you sould use ItemIndex instead name.

$oPolicy.Rules.Item(1))

 

Or other way like this:

GetFirewallRule('TeamViewer')

Func GetFirewallRule($sName)
    ; Error monitoring. This will trap all COM errors while alive.
    ; This particular object is declared as local, meaning after the function returns it will not exist.
    Local $oErrorHandler = ObjEvent("AutoIt.Error", "_ErrFunc")

    Local $oPolicy = ObjCreate("HNetCfg.FwPolicy2")

    Local $oRules_coll = $oPolicy.Rules
    If @error Then Return SetError(@error, @extended, '')

    For $oRule_enum In $oRules_coll
        If StringInStr($oRule_enum.name, $sName ) Then
        ConsoleWrite( $oRule_enum.name & @CRLF)
        EndIf
    Next

EndFunc    ;==>GetFirewallRule

; User's COM error function. Will be called if COM error occurs
Func _ErrFunc($oError)
    ; Do anything here.
    ConsoleWrite(@ScriptName & " (" & $oError.scriptline & ") : ==> COM Error intercepted !" & @CRLF & _
            @TAB & "err.number is: " & @TAB & @TAB & "0x" & Hex($oError.number) & @CRLF & _
            @TAB & "err.windescription:" & @TAB & $oError.windescription & @CRLF & _
            @TAB & "err.description is: " & @TAB & $oError.description & @CRLF & _
            @TAB & "err.source is: " & @TAB & @TAB & $oError.source & @CRLF & _
            @TAB & "err.helpfile is: " & @TAB & $oError.helpfile & @CRLF & _
            @TAB & "err.helpcontext is: " & @TAB & $oError.helpcontext & @CRLF & _
            @TAB & "err.lastdllerror is: " & @TAB & $oError.lastdllerror & @CRLF & _
            @TAB & "err.scriptline is: " & @TAB & $oError.scriptline & @CRLF & _
            @TAB & "err.retcode is: " & @TAB & "0x" & Hex($oError.retcode) & @CRLF & @CRLF)
EndFunc    ;==>_ErrFunc

 

Some reference:

https://msdn.microsoft.com/en-us/library/windows/desktop/aa365322(v=vs.85).aspx
https://msdn.microsoft.com/en-us/library/windows/desktop/aa364724(v=vs.85).aspx

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: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: 2021-10-18

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yeah thats the solution i'm currently using, but only a workaround...i think.

thanks for your time mLipok! :) 

Quote

When you are using .....Item()

then you sould use ItemIndex instead name

see https://msdn.microsoft.com/en-us/library/aa365348(v=vs.85).aspx

Func FirewallRuleExists($sName)
    Local $oPolicy = ObjCreate("HNetCfg.FwPolicy2")
    Return (IsObj($oPolicy.Rules.Item($sName))) ? 1 : 0
EndFunc

The one liner is smarter, but i think it's not possible to catch this error with autoit, what do you mean?

Is there something to prevent autoit from crashing in this case?

 

EDIT:

ok i can catch it with  Global $oErrorHandler = ObjEvent("AutoIt.Error", "_ErrFunc")

but then every error will be catched. Is it possible to catch only error from the policy object and normal errors like syntax and so on will cause a crash?

Edited by Trolleule
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I did it like

Func FirewallRuleExists($sName)
    Local $oPolicy = ObjCreate("HNetCfg.FwPolicy2")
    Return (IsObj($oPolicy.Rules.Item($sName))) ? 1 : 0
EndFunc


Func Template_COMErrorRegister()
    $__g_oTemplateCOMErrorHandler = ObjEvent("AutoIt.Error", "Template_COMErrFunc")
EndFunc   ;==>Template_COMErrorRegister


Func Template_COMErrorUnregister()
    $__g_oTemplateCOMErrorHandler = 0
EndFunc   ;==>Template_COMErrorUnregister


Func Template_COMErrFunc()
    ; Do nothing special, just check @error after suspect functions.
EndFunc   ;==>Template_COMErrFunc

Func GetOutgoingTrafficRules()
    
    Template_COMErrorRegister()
    Local $aCurExplorerOptions[] = [ _
        FirewallRuleExists('"AADBrokerPlugin"-App') , _
        FirewallRuleExists('"AppAccountsControl"-App') , _
        FirewallRuleExists('"BioEnrollment"-App') , _
        FirewallRuleExists('"LockApp"') , _
        FirewallRuleExists('"Edge"-App (Teil 1/2)') , _
        FirewallRuleExists('"Edge"-App (Teil 2/2)') , _
        FirewallRuleExists('"AssignedAccessLockApp"-App') , _
        FirewallRuleExists('"Background Task Host"-Prozesses') , _
        FirewallRuleExists('"Download Upload Host"-Prozesses') , _
        FirewallRuleExists('"Hostprozesses für Windows-Aufgaben"') , _
        FirewallRuleExists('"Host Process for Setting Synchronization"') , _
        FirewallRuleExists('"Microsoft Compatibility Telemetry"-Prozesses') , _
        FirewallRuleExists('"FeedbackSIUFDeployment"-Prozesses') , _
        FirewallRuleExists('"Feeds Synchronization"-Prozesses') , _
        FirewallRuleExists('"MalwareProtectionCommandLineUtility"-Prozesses') , _
        FirewallRuleExists('"Windows-Tools zum Entfernen bösartiger Software"') , _
        FirewallRuleExists('"RuntimeBroker"-Prozesses') , _
        FirewallRuleExists('"SIH Client"-Prozesses') , _
        FirewallRuleExists('"Problem Reporting"-Prozesses') , _
        FirewallRuleExists('"SQM-Konsolidator"-Prozesses') , _
        FirewallRuleExists('"Windows-Aktivierungsclient"-Prozesses') , _
        FirewallRuleExists('"Device Association Framework Provider Host"-Prozesses') _
    ]
    Template_COMErrorUnregister()
    
    Return $aCurExplorerOptions
EndFunc

Not much better, but so i don't need to do an arraysearch for every rule :)

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2 hours ago, Trolleule said:

see https://msdn.microsoft.com/en-us/library/aa365348(v=vs.85).aspx

Func FirewallRuleExists($sName)
    Local $oPolicy = ObjCreate("HNetCfg.FwPolicy2")
    Return (IsObj($oPolicy.Rules.Item($sName))) ? 1 : 0
EndFunc

 

"HNetCfg.FwPolicy2" is not the same as:
https://msdn.microsoft.com/en-us/library/aa365348(v=vs.85).aspx

"HNetCfg.FwPolicy2" is described here:
https://msdn.microsoft.com/en-us/library/windows/desktop/aa365322(v=vs.85).aspx

 

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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

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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

winhttp.au3 related : * https://www.autoitscript.com/forum/topic/206771-winhttpau3-download-problem-youre-speaking-plain-http-to-an-ssl-enabled-server-port/

"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: 2021-10-18

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So what is the problem ?

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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 * Include Dependency Tree (Tool for analyzing script relations) *

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

winhttp.au3 related : * https://www.autoitscript.com/forum/topic/206771-winhttpau3-download-problem-youre-speaking-plain-http-to-an-ssl-enabled-server-port/

"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: 2021-10-18

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Why not simply Return IsObj($oRules.Item("Test")) instead Return (IsObj($oRules.Item("Test"))) ? 1 : 0

 

Saludos

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shit thats right too @Danyfirex

i edited the code too much times, didn't see that :)

Strangely the object "HNetCfg.FwRules" can't be accessed. When i google for 

Quote

"HNetCfg.FwRules"

the results are always

Quote

"HNetCfg.FwRule"

which is not the same, but the documentation says this is a valid interface...no special remarks or something :S

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      #Region ;**** Directives created by AutoIt3Wrapper_GUI **** #AutoIt3Wrapper_UseX64=y #AutoIt3Wrapper_AU3Check_Parameters=-d -w 1 -w 2 -w 3 -w- 4 -w 5 -w 6 #EndRegion ;**** Directives created by AutoIt3Wrapper_GUI **** ;Au3CallByName, Bilgus Global $Au3_CallByName = 0 Local $hKernel32 = DllOpen("Kernel32.dll") OnAutoItExitRegister(__CallByNameCleanup) Func __CallByNameCleanup() Au3_CallByName_Init(False) ;Unload DllClose($hKernel32) EndFunc ;==>__CallByNameCleanup ; Takes a pointer to the v-table in a class and replaces specified member Id in it to a new one. Func __HookVTableEntry($pVtable, $iVtableOffset, $pHook, ByRef $pOldRet) ;;https://www.autoitscript.com/forum/topic/107678-hooking-into-the-idispatch-interface/ Local Const $PAGE_READWRITE = 0x04 Local $tpVtable = DllStructCreate("ptr", $pVtable) Local $szPtr = DllStructGetSize($tpVtable) Local $pFirstEntry, $pEntry, $tEntry, $aCall, $flOldProtect, $bStatus ; Dereference the vtable pointer $pFirstEntry = DllStructGetData($tpVtable, 1) $pEntry = $pFirstEntry + ($iVtableOffset * $szPtr) ; Make the memory free for all. Yay! $aCall = DllCall($hKernel32, "int", "VirtualProtect", "ptr", $pEntry, "long", $szPtr, "dword", $PAGE_READWRITE, "dword*", 0) If @error Or Not $aCall[0] Then ConsoleWriteError("Error: Failed To hook vTable" & @CRLF) Return False EndIf $flOldProtect = $aCall[4] $tEntry = DllStructCreate("ptr", $pEntry) $pOldRet = DllStructGetData($tEntry, 1) If $pOldRet <> $pHook Then DllStructSetData($tEntry, 1, $pHook) $bStatus = True Else ;Already Hooked ConsoleWriteError("Error: vTable is already hooked" & @CRLF) $bStatus = False EndIf ;put the memory protect back how we found it DllCall($hKernel32, "int", "VirtualProtect", "ptr", $pEntry, "long", $szPtr, "dword", $flOldProtect, "dword*", 0) Return $bStatus EndFunc ;==>__HookVTableEntry ; Everytime autoit wants to call a method, get or set a property in a object it needs to go to ; IDispatch::GetIDsFromNames. This is our version of that function, note that by defining this ourselves ; we can fool autoit to believe that the object supports a lot of different properties/methods. Func __IDispatch_GetIDsFromNames($pSelf, $riid, $rgszNames, $cNames, $lcid, $rgDispId) Local Const $CSTR_EQUAL = 0x02 Local Const $LOCALE_SYSTEM_DEFAULT = 0x800 Local Const $DISP_E_UNKNOWNNAME = 0x80020006 Local Static $pGIFN = __Pointer_GetIDsFromNames() Local Static $tpMember = DllStructCreate("ptr") If $Au3_CallByName Then Local $hRes, $aCall, $tMember ;autoit only asks for one member $aCall = DllCall($hKernel32, 'int', 'CompareStringW', 'dword', $LOCALE_SYSTEM_DEFAULT, 'dword', 0, 'wstr', "Au3_CallByName", 'int', -1, _ 'struct*', DllStructGetData(DllStructCreate("ptr[" & $cNames & "]", $rgszNames), 1, 1), 'int', -1) If Not @error And $aCall[0] = $CSTR_EQUAL Then ;ConsoleWrite("CallByName: " & $Au3_CallByName & @CRLF) $tMember = DllStructCreate("wchar[" & StringLen($Au3_CallByName) + 1 & "]") DllStructSetData($tMember, 1, $Au3_CallByName) DllStructSetData($tpMember, 1, DllStructGetPtr($tMember)) $rgszNames = $tpMember $Au3_CallByName = 0 EndIf EndIf ;Call the original GetIDsFromNames $hRes = DllCallAddress("LRESULT", $pGIFN, "ptr", $pSelf, "ptr", $riid, _ "struct*", $rgszNames, "dword", $cNames, "dword", $lcid, "ptr", $rgDispId) If @error Then ConsoleWrite("Error: GetIDsFromNames: " & @error & @CRLF) Return $DISP_E_UNKNOWNNAME EndIf Return $hRes[0] EndFunc ;==>__IDispatch_GetIDsFromNames Func __Pointer_GetIDsFromNames($ptr = 0) Local Static $pOldGIFN = $ptr If $ptr <> 0 Then $pOldGIFN = $ptr Return $pOldGIFN EndFunc ;==>__Pointer_GetIDsFromNames Func Au3_CallByName_Init($bHook = True, $classname = "shell.application") Local Const $iOffset_GetIDsFromNames = 5 Local Static $IDispatch_GetIDsFromNames_Callback = 0 Local $oObject, $pObject, $pHook, $pOldGIFN If $bHook Then If $IDispatch_GetIDsFromNames_Callback = 0 Then $IDispatch_GetIDsFromNames_Callback = DllCallbackRegister("__IDispatch_GetIDsFromNames", "LRESULT", "ptr;ptr;ptr;dword;dword;ptr") EndIf $pHook = DllCallbackGetPtr($IDispatch_GetIDsFromNames_Callback) Else $pHook = __Pointer_GetIDsFromNames() If $pHook <= 0 Then Return ;Already Unloaded EndIf $oObject = ObjCreate($classname) $pObject = DllStructSetData(DllStructCreate("ptr"), 1, $oObject) If __HookVTableEntry($pObject, $iOffset_GetIDsFromNames, $pHook, $pOldGIFN) Then __Pointer_GetIDsFromNames($pOldGIFN) ;Save the original pointer to GetIDsFromNames If Not $bHook Then DllCallbackFree($IDispatch_GetIDsFromNames_Callback) $IDispatch_GetIDsFromNames_Callback = 0 EndIf Else ;Error EndIf $oObject = 0 EndFunc ;==>Au3_CallByName_Init ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ;TESTS; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; Au3_CallByName_Init() #include <ie.au3> Global $oRegistrationInfo = _IECreate() Global $aRegistrationInfo[] = ['Left=10', 'Top= 10', 'Width=450', 'Height=600'] Global $oObject = $oRegistrationInfo Local $oDictionary = ObjCreate("Scripting.Dictionary") Local $oDictionary2 = ObjCreate("Scripting.Dictionary") ;Au3_CallByName_Init($oObject) __TS_TaskPropertiesSet($oObject, $aRegistrationInfo) MsgBox(0, "Info", "Press OK to exit") $oRegistrationInfo.quit $oRegistrationInfo = 0 $oObject = 0 Sleep(1000) For $i = 1 To 10 $Au3_CallByName = "Add" $oDictionary.Au3_CallByName("test1:" & $i, "Dictionary Item: " & $i) Next $Au3_CallByName = "keys" For $sKey In $oDictionary.Au3_CallByName() For $j = 0 To 1 $Au3_CallByName = ($j = 0) ? "Item" : "Exists" ConsoleWrite($sKey & " -> " & $oDictionary.Au3_CallByName($sKey) & @CRLF) Next Next Au3_CallByName_Init(False) ;Unload Au3_CallByName_Init() Local $aRegistrationInfo[] = ['Left=1000', 'Width=450'] ConsoleWrite(@CRLF & "NEW IE" & @CRLF & @CRLF) $oRegistrationInfo = _IECreate() __TS_TaskPropertiesSet($oRegistrationInfo, $aRegistrationInfo) MsgBox(0, "Info", "Press OK to exit") $oRegistrationInfo.quit For $i = 1 To 10 $Au3_CallByName = "Add" $oDictionary2.Au3_CallByName("test2:" & $i, "Dictionary Item: " & $i) Next $Au3_CallByName = "keys" For $sKey In $oDictionary2.Au3_CallByName() For $j = 0 To 1 $Au3_CallByName = ($j = 0) ? "Item" : "Exists" ConsoleWrite($sKey & " -> " & $oDictionary2.Au3_CallByName($sKey) & @CRLF) Next Next Au3_CallByName_Init(False) ;Unload (Not Strictly Needed, Done on Script Close) Func __TS_TaskPropertiesSet(ByRef $oObject, $aProperties) Local $aTemp If IsArray($aProperties) Then For $i = 0 To UBound($aProperties) - 1 $aTemp = StringSplit($aProperties[$i], "=", 2) ; 2 -> $STR_NOCOUNT) If @error Then ContinueLoop ConsoleWrite("Command: $oObject." & $aTemp[0] & " = " & $aTemp[1] & @CRLF) $Au3_CallByName = $aTemp[0] $oObject.Au3_CallByName = $aTemp[1] ConsoleWrite("Result : " & Hex(@error) & @CRLF) ; If @error Then Return SetError(1, @error, 0) Next EndIf EndFunc ;==>__TS_TaskPropertiesSet  
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