Is there any way to list available methods for created object in VBS?
For example:
Set IE = CreateObject("InternetExplorer.Application")
I want to list available properties of this object, as:
IE.AddressBar
IE.Application
IE.Busy
...
or methods:
IE.ClientToWindow
IE.ExecWB
IE.GetProperty
...
How can I discover available properties to arbitrary valid object in VBS?
VBScript itself does not support type introspection outside the TypeName and VarType functions, which will give you the type of an object, but won't give you access to its internal structure.
As other answers explained there is a DLL that would provide this feature, but it doesn't ship with Windows, and since it was part of an old version of Visual Studio there might not be a legal way to obtain it nowadays.
Using TypeLib Information Objects from tlbinf32.dll it is possible to list all members of a class.
tlbinf32.dll was part of Visual Studio 6.0, which was the current release in the years around 2000. Microsoft seems to not offer the DLL for download anymore (situation mid 2017), but you can download it from various sites on the internet. I found version 1.1.88.4, Build 8804, Copyright Matthew Curland 1996, Microsoft 1997-2000, size 148.480 Bytes at https://www.dll4free.com/tlbinf32.dll.html, or other sites.
To install the DLL in Win32, copy it to %windir%\System32 and as administrator call regsvr32.exe tlbinf32.dll from that directory.
To insttall the DLL in Win64, copy it to %windir%\syswow64, then as administrator register with %windir%\syswow64\regsvr32.exe, and finally run the vbscript with %windir%\syswow64\cscript.exe (or wscript.exe). Thanks BuvinJ for the hint
The following script demonstrates the included function VariableInfo which will return a string with the type of the passed variable, and in case of an Object, all members with details, including type of Property, callable type (Sub or Function), and parameter names and return type in case of Function. The type name of the object in case of a COM object would be the name of the implemented Interface. Not sure if it works for multiple implemented interfaces, but AFAIK it's not possible to implement multiple interfaces in one class via COM anyway.
It does not support recursion in any way, because this would lead to infinity loops for some types.
This will give you virtually full working reflection in VBS. Great to explore APIs for example with the Microsoft Script Debugger.
' Reflection for VBScript via tlbinfo32.dll
'
' Patrick Strasser-Mikhail 2017-2019
' Ansgar Wiechers 2019
' https://stackoverflow.com/questions/14305750/list-object-methods-and-properties/44459670#44459670
Option Explicit
' Returns a String describing the passed object/variable on the first level, no recursion.
Function VariableInfo(obj)
Const invokeKindPropertyGet = 0
Const invokeKindFunction = 1
Const invokeKindPropertyPut = 2
Const invokeKindPropertyPutRef = 4
If isEmpty(obj) Or _
isNull(obj) _
Then
VariableInfo = TypeNameFromVarType(VarType(obj))
ElseIf Not IsObject(obj) Then
If Not isArray(obj) Then
VariableInfo = TypeNameFromVarType(VarType(obj)) & ", Value: " & obj
Else
VariableInfo = TypeNameFromVarType(VarType(obj)) & "("
Dim dimension
Dim size
On Error Resume Next
Err.Clear
For dimension = 1 To 10 ' deliberate limit to prevent infinite loop
size = Ubound(obj, dimension) + 1
If Err.Number <> 0 Then
Exit For
End If
If dimension > 1 Then
VariableInfo = VariableInfo & ","
End If
VariableInfo = VariableInfo & Ubound(obj, dimension)
Next
On Error Goto 0
VariableInfo = VariableInfo & ")"
End If
ElseIf TypeName(obj) = "Nothing" Then
VariableInfo = "Nothing (The Invalid Object)"
Else
Dim TLI
Dim MemberInfo
Dim TypeInfo
Set TLI = CreateObject("TLI.TLIApplication")
VariableInfo = "Object " & TypeName(obj)
On Error Resume Next
Err.Clear
Set TypeInfo = TLI.InterfaceInfoFromObject(obj)
If Err.Number <> 0 Then
VariableInfo = VariableInfo & "; Error " & Err.Number
VariableInfo = VariableInfo & ": " & Err.Description
Err.Clear
Exit Function
End If
For Each MemberInfo In TypeInfo.Members
Dim Desc
Desc = ""
Select Case MemberInfo.InvokeKind
Case InvokeKindFunction
If MemberInfo.ReturnType.VarType <> 24 Then
Desc = " Function " & TypeNameFromVarType(MemberInfo.ReturnType.VarType)
Else
Desc = " Sub"
End If
Desc = Desc & " " & MemberInfo.Name
Dim ParameterList
ParameterList = Array()
Dim Parameter
For Each Parameter In MemberInfo.Parameters
ReDim Preserve parameterList(UBound(ParameterList) + 1)
ParameterList(Ubound(parameterList)) = Parameter.Name
Next
Desc = Desc & "(" & Join(ParameterList, ", ") & ")"
'Set parameters = Nothing
Case InvokeKindPropertyGet
Desc = " Property " & MemberInfo.Name
Case InvokeKindPropertyPut
Desc = " Property (set/get) " & MemberInfo.Name
Case InvokeKindPropertyPutRef
Desc = " Property (set ref/get) " & MemberInfo.Name
Case Else
Desc = " Unknown member, InvokeKind " & MemberInfo.InvokeKind
End Select
VariableInfo = VariableInfo & vbNewLine & Desc
Next
Set TypeInfo = Nothing
Set TLI = Nothing
End If
End Function
' Decode Type Number to something readable
Function TypeNameFromVarType(typeNr)
Dim typeDetails
set typeDetails = CreateObject("Scripting.Dictionary")
typeDetails.add 0, "vbEmpty (uninitialized variable)"
typeDetails.add 1, "vbNull (value unknown)"
typeDetails.add 2, "vbInteger" ' Short?
typeDetails.add 3, "vbLong" ' Integer?
typeDetails.add 4, "vbSingle"
typeDetails.add 5, "vbDouble"
typeDetails.add 6, "vbCurrency"
typeDetails.add 7, "vbDate"
typeDetails.add 8, "vbString"
typeDetails.add 9, "vbObject"
typeDetails.add 10, "Exception"
typeDetails.add 11, "vbBoolean"
typeDetails.add 12, "vbVariant"
typeDetails.add 13, "DataObject"
typeDetails.add 14, "vbDecimal"
typeDetails.add 17, "vbByte"
typeDetails.add 18, "vbChar"
typeDetails.add 19, "ULong"
typeDetails.add 20, "Long" ' realy Long?
typeDetails.add 24, "(void)"
typeDetails.add 36, "UserDefinedType"
If typeDetails.Exists(typeNr) Then
TypeNameFromVarType = typeDetails(typeNr)
ElseIf typeNr > 8192 Then
TypeNameFromVarType = "vbArray{" & TypeNameFromVarType(typeNr - 8192) & "}"
Else
typeNameFromVarType = "Unknown Type " & typeNr
End If
End Function
' Some nice example class to demonstrate all possible interfaces.
Class MyClass
Dim Name_
Dim Name2_
Public Property Get Name
Name = Name_
End Property
Public Property Let Name(ByVal Value)
Name_ = Value
End Property
Public Property Let Name2(ByRef Value)
Set Name2_ = Value
End Property
Sub TestSub()
WScript.Echo "Test"
End Sub
Sub TestFunc(message)
WScript.Echo "Test: " & message
End Sub
Sub TestFunc2(ByRef message)
WScript.Echo "Test: " & message
End Sub
Function Add(first, second)
Add = first + second
End Function
Function Substract(ByVal first, ByRef second)
Add = first - second
End Function
End Class
Sub testVariableInfo()
Dim variable
' vbEmpty
Wscript.Echo VariableInfo(variable)
variable = Null
Wscript.Echo VariableInfo(variable)
Set variable = Nothing
Wscript.Echo VariableInfo(variable)
Dim MyObject
Set MyObject = new MyClass
Wscript.Echo VariableInfo(MyObject)
Set MyObject = Nothing
Dim TestA1(3, 7)
Wscript.Echo VariableInfo(TestA1)
Dim TestA2()
Wscript.Echo VariableInfo(TestA2)
Dim TestA3
TestA3 = Array(4, 5, 6)
Wscript.Echo VariableInfo(TestA3)
End Sub
testVariableInfo
For for more information about the Typelib Interface, get the documentation help file from Microsoft KB artivle 224331
Matthew Curland offers for download at the website to his book Advanced Visual Basic 6 the nice program Type Library Editor (EditTLBEval.exe) as evaluation version, and the according Documentation
Especially in this context I really like the line If you're a Visual Basic developer who refuses to recognize the commonly accepted limitations of VB, this book is definitely for you. by Ted Pattison. Just replace VB by VBScript here.
VBWebProfi gave the hint for TLI, thanks for that. Working out the details and writing the code was several hours of work, though ;-)
While that is partially true, its incomplete.... Google, GetObjectText_, Methods_, & Propeties_
The referenced methods will only work on objects collected while connected to the cimv2 namespace of a remote host via the WbemScripting.SWbemLocator object. If this object has the ability to work on localhost, it's unapparent to me.
Once you do this you can query any of the classes held therein [Win32_Services,Win32_Drives, etc] and interrogate the objects in the resultset using a For-Next loop on the object like below...
For Each oProp in oObject.Properties_
'be careful here because some propeties may be an object or an array.
'so test for that here using "typename" or "vartype"
wScript.Echo oProp.Name & vbTab & oProp
Next
Or...
For Each oMethod in oObject.Methods_
wScript.Echo oProp.Name
Next
Finally, ...
For Each oProp in oObject.Properties_
'This will display all of an objects properties
oProp.GetObjectText_
Next
If you happen to be using HP UFT or QTP then follow these steps:
1) Install any version of MS Visual Studio onto your laptop. (Don't worry about licensing, you won't be running VS)
2) Reboot your computer.
3) Launch UFT or QTP, load a script and hit F11, (or pause at any piece of code that is near the object you want to inspect).
4) Add the object to the Watch window. It can be an Object Repository object or a programmatic description.
If the object exists, the object will now display two Plus (+) signs in the Watch window that can be expanded to show all available Methods and Properties, as well as child objects that can be expanded.
Use TLI . The TLI.TLIApplication class (from tlbinf32.dll) can inspect various COM objects from their instance. Explore the TLI library in Excel or other Microsoft product that supports scripting and has an script editor which is able to add references, then add tlbinf32.dll. The name in the references is "Typelib information".
Note that the DLL does not ship with Windows, though.
Use the method InterfaceInfoFromObject() for VBScript classes and alternatively try ClassInfoFromObject().
Option Explicit
Dim TLI
Dim MyObject
Dim TypeInfo
Dim MemberInfo
Set TLI = CreateObject("TLI.TLIApplication")
Set MyObject = New MyClass
Set TypeInfo = TLI.InterfaceInfoFromObject(MyObject)
For Each MemberInfo In TypeInfo.Members
WScript.Echo MemberInfo.Name
Next
Class MyClass
Dim Name_
Public Property Get Name
Name = Name_
End Property
Public Property Let Name(ByVal Value)
Name_ = Value
End Property
End Class
Try this ...
For i = 0 To webElementCount-1 Step 1
innertextProp = myValue2(i).GetROProperty("innertext")
print i & innertextProp
print innertextProp
Next
