In VBA, you can use either Cells or Cells.Value, it has the same effect. Test1 and Test2 behaves the same way, allthough in test 2 the string is passed directly to the object.
Sub Test1()
Cells(1, 1) .Value = "Hello"
End Sub
Sub Test2()
Cells(1, 2) = "World"
End Sub
Is it possible to do something similar with any user class? Can-I assign a value directly to an object created from one of my classes withpout using the property value ?
Following Tim and K. recommendations, I've created a the following class:
Option Explicit
Dim LNG_Debut As Long
Public Property Let Debut(tLNG_Debut As Long)
LNG_Debut = tLNG_Debut
End Property
Property Get Debut() As Long
Debut = LNG_Debut
End Property
Then, I’ve exported that class to notepad and modified it the following way:
Property Get Debut() As Long
Attribute Debut.VB_UserMemId = 0
Debut = LNG_Debut
End Property
And finaly, I’ve imported it back in the VBA editor.
Then, both Test1 and Test2 have the same result
Sub Test1()
Dim MyVariable As obj_Test
Set MyVariable = New obj_Test
MyVariable.Debut = 10
End Sub
And
Sub Test2()
Dim MyVariable As obj_Test
Set MyVariable = New obj_Test
MyVariable = 10
End Sub
Many thanks
Related
Ok to start off, I read through this.
It is close although it doesn't answer my specific question. This talks about taking smaller collections and adding items to a larger main collection. Then destroying the smaller collection.
I have two definitions under Class Modules.
TimeDet
Option Explicit
Public recDate As String
Public recQty As String
Public recDieNo As String
Public recCatID As String
Public recCatName As String
Public recGroupID As String
Public recGroupName As String
TimeRec
Option Explicit
Private objTimeRec As Collection
Private Sub Class_Initialize()
Set objTimeRec = New Collection
End Sub
Private Sub Class_Terminate()
Set objTimeRec = Nothing
End Sub
Public Property Get NewEnum() As IUnknown
Set NewEnum = objTimeRec.[_NewEnum]
End Property
Public Sub Add(obj As TimeDet)
objTimeRec.Add obj
End Sub
Public Sub Remove(Index As Variant)
objTimeRec.Remove Index
End Sub
Public Property Get Item(Index As Variant) As TimeDet
Set Item = objTimeRec.Item(Index)
End Property
Property Get Count() As Long
Count = objTimeRec.Count
End Property
Public Sub Clear()
Set objTimeRec = New Collection
End Sub
Public Sub FillFromArray(Arr As Variant)
Dim i As Long, obj As TimeDet
For i = 1 To UBound(Arr)
Set obj = New TimeDet
obj.recDate = Arr(i, 1)
obj.recQty = Arr(i, 2)
obj.recDieNo = Arr(i, 3)
obj.recCatID = Arr(i, 4)
obj.recCatName = Arr(i, 5)
obj.recGroupID = Arr(i, 6)
obj.recGroupName = Arr(i, 7)
Me.Add obj
Next
End Sub
Then in the code I am using it this way:
Sub Test()
Dim RecSet1 As TimeRec, Record As TimeDet
Dim fSet1 As TimeRec, fRecord As TimeDet
Dim repArray() As Variant
Dim startDT As Date, endDT As Date, dieNo As String
repArray() = Sheet4.Range("A2:G" & Sheet4.Range("A2").End(xlDown).Row)
Set RecSet1 = New TimeRec
Set fSet1 = New TimeRec
RecSet1.FillFromArray (repArray())
startDT = "1-1-2015"
endDT = "1-1-2016"
dieNo = "16185"
For Each Record In RecSet1
If Record.recDate <= endDT And Record.recDate >= startDT And Record.recDieNo = dieNo Then
fSet1.Add (Record)
End If
Next
End Sub
I am getting an error when I try to add the Record object to the fSet1 object.
"Object doesn't support this method or property"
The Record object is Type TimeDet which as you can see up in the class module my Add method is expecting type TimeDet.
Either I am missing something very simple and have blinders on, or this is a bigger issue.
The array has 200,000 records roughly. I am attempting to create a smaller subset of filtered data. Maybe I am approaching this from the wrong way.
Your error is not at Add but at For Each
Most likely you copied your TimeRec Class. In VBA, you can't create enumerable classes inside the VBE (VBA IDE). There's a different way of creating Enumerable classes.
Open a notepad, copy all your class code and then add this attribute to NewEnum property Attribute NewEnum.VB_UserMemId = -4
Then import the class.
This is always hidden in VBA code, but can be seen in text editors.
Also add this attribute to Item property, it will make it default and allows syntax like ClassName(1)
Attribute Item.VB_UserMemId = 0
So , your code in text editor/ notepad should be:
VERSION 1.0 CLASS
BEGIN
MultiUse = -1 'True
END
Attribute VB_Name = "Class1"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = False
Attribute VB_Exposed = False
Option Explicit
Private objTimeRec As Collection
Private Sub Class_Initialize()
Set objTimeRec = New Collection
End Sub
Private Sub Class_Terminate()
Set objTimeRec = Nothing
End Sub
Public Property Get NewEnum() As IUnknown
Attribute NewEnum.VB_UserMemId = -4
Set NewEnum = objTimeRec.[_NewEnum]
End Property
Public Sub Add(obj As Class2)
objTimeRec.Add obj
End Sub
Public Sub Remove(Index As Variant)
objTimeRec.Remove Index
End Sub
Public Property Get Item(Index As Variant) As Class2
Attribute Item.VB_UserMemId = 0
Set Item = objTimeRec.Item(Index)
End Property
Property Get Count() As Long
Count = objTimeRec.Count
End Property
Public Sub Clear()
Set objTimeRec = New Collection
End Sub
The answer to this particular problem was to remove the parenthesis form my Add method. That being said, the attribute info being hidden was really good info and would have probably contributed to the problem after I figured out that removing the parenthesis fixed it.
In a VBA module I have the following declaration of constants:
Private Const const_abc = 3000
Private Const const_def = 900
Private Const const_etc = 42
' and so on and so forth
Now, I have to initialize these values with a one time function call, ideally something like so
Private Const const_abc = someFunc(18)
Private Const const_def = someFunc( 7)
Private Const const_etc = someFunc( 5)
' and so on and so forth
Of course, this won't work in VBA. So, is there a common pattern on how to deal with such a requirement?
I probably could go like so
Private const_abc As Double
Private const_def As Double
Private const_etc As Double
sub initConsts()
const_abc = someFunc(18)
const_def = someFunc( 7)
const_etc = someFunc( 5)
end sub
But then I'd have to make sure that initConsts is called which I'd rather not do.
Edit As per the question of S O, I am using MS-Access.
Create a class that reads the cell and presents a Get-only interface to the value.
Here's a class called ItsMyValueClass
Option Explicit
Private pMyVal As Integer
Public Property Get MyValue() As Integer
MyValue = pMyVal
End Property
Private Sub class_initialize()
'pMyVal = Sheet.Range("somewhere)
pMyVal = 17
End Sub
And here's the code in your module:
Option Explicit
Sub IsItReadOnly()
Dim valu As ItsMyValueClass
Dim x As Integer
Set valu = New ItsMyValueClass
x = valu.MyValue
'valu.MyValue = 23 'compile error "Can't assign to read-only property"
End Sub
Public Function White() as Long
White = RGB(255,255,255)
End function
Private Sub TestIt()
Debug.Print "White is " & White
White = 123 ' <-- compile error
End Sub
in a one-liner that works with modules and classes alike for pure constant-like access:
Public Property Get myConst() As Integer: myConst = 3: End Property
you would use it like this:
Sub test()
Debug.Print "myConst: " & myConst 'would print: "myConst: 3"
End Sub
and if it has to be initialized with a custom value once, one could do it with a static property and one or many private variables:
Private ci As Boolean 'constants initialized
Private myConst1_ As Integer
Private myConst2_ As Integer
Static Property Get myConst1() As Integer
If Not ci Then init
myConst1 = myConst1_
End Property
Static Property Get myConst2() As Integer
If Not ci Then init
myConst2 = myConst2_
End Property
Private Sub init()
'these can come from anywhere:
myConst1_ = 3
myConst2_ = 5
ci = True
End Sub
they are initialized on the first access of the first "constant" property
if you have to initialize them earlier one could just call the init function earlier (and optionally remove the ci variable and all related lines if it is ensured that the properties are not accessed earlier)
I have created two classes, one being an interface for the other. Each time I try to instantiate Transition_Model I get:
Compile error: Object Module needs to implement '~' for interface'~'
To my understanding Implementing class is supposed to have a copy of all public subs, function, & properties. So I don't understant what is the problem here?
Have seen similar questions come up but either they refer to actual Sub or they include other complications making answer too complicated for me to understand.
Also note I tried changing Subs of Transition_Model to Private and add 'IModel_' in front of sub names(Just like top answer in second question I linked) but I still receive the same error.
IModel
Option Explicit
Public Enum Model_Types
Transition
Dummy
End Enum
Property Get M_Type() As Model_Types
End Property
Sub Run(Collat As Collateral)
End Sub
Sub Set_Params(key As String, value As Variant)
End Sub
Transition_Model
Option Explicit
Implements IModel
Private Transitions As Collection
Private Loan_States As Integer
Private Sub Class_Initialize()
Set Transitions = New Collection
End Sub
Public Property Get M_Type() As Model_Types
M_Type = Transition
End Property
Public Sub Run(Collat As Collateral)
Dim A_Transition As Transition
Dim New_Balance() As Double
Dim Row As Integer
For Row = 1 To UBound(Collat.Curr_Balance)
For Each A_Transition In Transitions
If A_Transition.Begining = i Then
New_Balance = New_Balance + Collat.Curr_Balance(Row) * A_Transition.Probability
End If
Next A_Transition
Next
End Sub
Public Sub Set_Params(key As String, value As Double)
Dim Split_key(1 To 2) As String
Dim New_Transition As Transition
Split_key = Split(key, "->")
Set New_Transition = New Transition
With New_Transition
.Begining = Split_key(1)
.Ending = Split_key(2)
.Probability = value
End With
Transitions.Add New_Transition, key
End Sub
Lastly the Sub I am using to test my class
Sub Transition_Model()
Dim Tested_Class As New Transition_Model
Dim Collat As New Collateral
'Test is the model type is correct
Debug.Assert Tested_Class.M_Type = Transition
'Test if Model without transition indeed does not affect balances of its collateral
Collat.Curr_Balance(1) = 0.5
Collat.Curr_Balance(2) = 0.5
Tested_Class.Run (Collat)
Debug.Assert ( _
Collat.Curr_Balance(1) = 0.5 And _
Collat.Curr_Balance(2) = 0.5)
End Sub
Actaully Per the second question I linked has the correct answer which I missed.
All subs need to start with 'IModel_' and rest ot the name has to match the name in IModel.
AND
This is the part i missed, you cannot use underscore in the Sub name.
Beginner to excel class modules here. I am having trouble with the basics-
When I set (let) the property, I get "Compile error: Wrong number of arguments or invalid property assessment" with the .Name property:
Sub test()
Dim acc As account
Set acc = New account
MsgBox (acc.Name("First Account").rowNum())
End Sub
And this is the "account" class module:
Private strAccName As String
Private mlngRowNum As Long
Public Property Let Name(strN As String)
strAccName = strN
End Property
Public Property Get rowNum(exists As Boolean)
dim rowNum as Long
'...some logic here...
'...
getRowNum = rowNum
End Property
So supposedly I am going wrong in the Let method? Advice greatly appreciated
you can assign a value to a property LET (for normal dataTypes) or property SET (for Object) by the equal sign, not vith parenthesis (used for method instead), or read a property GET assigning the value to another variable, like this:
acc.Name = "xyz"
MsgBox acc.Name
This might help you:
Sub test_class()
Dim acc As account
Set acc = New account
acc.Name = "First Account"
MsgBox acc.rowNum(1)
End Sub
class (account):
Private strAccName As String
Private mlngRowNum As Long
Public Property Let Name(strN As String)
strAccName = strN
End Property
Public Property Get rowNum(exists As Boolean)
'Dim rowNum As Long
'...some logic here...
'...
If exists Then
'getRowNum = rowNum
rowNum = 5
Else
rowNum = 10
End If
End Property
Excel VBA won't let you use global variables of arrays so I am trying to use a class to keep track of the variables I need. I am trying to create the variable in one sub and call it from another, but I don't know how to do it.
Sub Test3()
Dim mc As cVars
Set mc = New cVars
Dim ex() As Double
ReDim ex(1 To 5)
For i = 1 To 5
ex(i) = i
Next i
mc.Arr = ex
Call Test4
End Sub
Sub Test4()
Dim out() As Double
ReDim out(1 To 5)
out = mc.Arr
MsgBox (out(2))
End Sub
...
Option Explicit
Private pArr() As Double
Public Property Get Arr() As Double()
Arr = pArr()
End Property
Public Property Let Arr(p() As Double)
pArr = p()
End Property
The error comes in Test4() because there is no mc initiated, I tried initiating it but it then is not the same class (I believe)
Why not change Sub Test4() to a function instead calling a variable mc:
Function Test4(mc As cVars)
Dim out() As Double
ReDim out(1 To 5)
out. mc.Arr
MsgBox(out(2))
End Function
That may work.