Error Creating Vba Structure
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it only takes a minute: Sign up Use of Custom Data Types in VBA up vote 22 down vote favorite 6 I am trying to create a custom data type in VBA for Excel. Let's call this data type "truck". Each truck has the following attributes: NumberOfAxles (this is an integer) AxleWeights (this is an array of doubles) AxleSpacings (this error creating save file vba is an array of doubles) Can I create many instances of the data type "truck" (truck(1), truck(2)... etc), and read/write the attributes I listed above to that instance? Example: Truck(1).NumberOfAxles = 2 Truck(1).AxleWeights(1) = 15.0 Truck(1).AxleWeights(2) = 30.0 Truck(1).AxleSpacings(1) = 8.0 Truck(2).NumberOfAxles = 3 Truck(2).AxleWeights(1) = 8.0 Truck(2).AxleWeights(2) = 10.0 Truck(2).AxleWeights(3) = 12.0 Truck(2).AxleSpacings(1) = 20.0 Truck(2).AxleSpacings(2) = 4.0 and so on. The syntax above is most possibly wrong, I just wanted to demonstrate the structure I need to come up with. All I am trying to write data to a data structure and call it as necessary such as Truck(i).NumberOfAxles Truck(i).AxleWeights(j) Truck(i).AxleSpacings(j) Thank you very much! excel class vba types excel-vba share|improve this question asked Sep 13 '12 at 20:20 marillion 1,39662231 add a comment| 2 Answers 2 active oldest votes up vote 38 down vote accepted Sure you can: Option Explicit '***** User defined type Public Type MyType MyInt As Integer MyString As String MyDoubleArr(2) As Double End Type '***** Testing MyType as single variable Public Sub MyFirstSub() Dim MyVar As MyType MyVar.MyInt = 2 MyV
Classes. Introduction Classes are a very powerful tool in intermediate to advanced level VBA programming. This page is an introduction to what a class and an object are and will hopefully get you started working with classes. This is by
Vba Structure Declaration
no means a comprehensive guide. Entire books have been written about Object Oriented Programming, vba structure array of which classes are an essential component. In VBA, a class is defined in class module and serves as a excel vba structure template for an object. The term object is deliberately vague. An object can be defined to represent whatever you want. Anything that you can describe conceptually can be represented by a class. The difference between http://stackoverflow.com/questions/12414168/use-of-custom-data-types-in-vba a class and an object is that a class does nothing and consumes no memory. It is like a blueprint. When you have a variable of that class type and create instance of that class with the New keyword, a process called instantiating, it becomes an object and consumes memory and can carry out actions. A class is defined by its properties, which describe attributes of the class, and http://www.cpearson.com/excel/classes.aspx its methods (sub and function procedures), which carry out actions in the object. If a class is analogous to a noun, a property is like an adjective -- it describes the object. A method is like a verb -- it carries out an action. You must instantiate a class into an object in order to do anything with it. There is nothing you can do with a class module beyond creating an object from it. An example of instantiation is shown below: Dim C As Class1 Set C = New Class1 where Class1 is the name of the class module. Unlike other languages, VB/VBA allows for only one class in a class module, and the name of the class is the name of the module. You can now work with the properties and methods defined in Class1 in the C object variable. NOTE: It is also possible to combine the two statements above into a single statement: Dim C As New Class1 This is called an auto-instancing variable. When the variable C is first encountered in code, a new instance is created. In general, you should avoid auto-instancing variables for two reasons: First, it adds overhead to the code because the variable must be tested
primitive types, resulting in an advanced data type that is not inherently built in the Visual Basic language. To create a structure, you use the same formula as a class but with the Structure keyword. Here is an example of http://www.functionx.com/visualbasic/Lesson19.htm a structure: Public Structure Box End Structure Like a class, a structure can have member variables http://www.globaliconnect.com/excel/index.php?option=com_content&view=article&id=160:excel-vba-custom-classes-a-objects-class-modules-custom-events&catid=79&Itemid=475 and they are listed in the body of the structure between the Structure and the End Structure lines. Here is an example: Public Structure Box Dim Length As Double End Structure Like a class, a structure can have methods as its members. The structures are created and implemented using the same techniques. Here is an example: Public Structure Box Dim Length As Double Dim error creating Width As Double Dim height As Double Function Volume() As Double Return Length * Width * height End Function End Structure Like a class, a structure can have a constructor and even various versions of its constructor. Practical Learning: Introducing Structures Start Microsoft Visual Basic and create a Console Application named DepartmentStore5 In the Solution Explorer, right-click Module1.vb and click Rename Set the name to DepartmentStore.vb, press Enter, and accept to rename the file To create a new class, in error creating save the Solution Explorer, right-click DepartmentStore5 -> Add -> Class... Set the Name to StoreItem and click Add Save All Structure Declaration Like any other data type, to use a structure, you can first declare a variable from it. You do this as if the variable were of a primitive type. That is, you do not have to allocated memory for it using the New operator. After declaring the variable, to access the members of the structure, you can use the period operator. Here is an example: Public Module Exercise Public Structure Box Dim Length As Double Dim Width As Double Dim height As Double Function Volume() As Double Return Length * Width * height End Function End Structure Public Function Main() As Integer Dim ShoeBox As Box ShoeBox.Length = 22.84 ShoeBox.Width = 18.05 ShoeBox.height = 12.94 MsgBox("Box Characteristics" & vbCrLf & _ "Length:" & vbTab & FormatNumber(ShoeBox.Length) & vbCrLf & _ "Width:" & vbTab & FormatNumber(ShoeBox.Width) & vbCrLf & _ "Height:" & vbTab & FormatNumber(ShoeBox.height)) Return 0 End Function End Module This would produce: By default, the memory allocated for a variable of a structure type is in the stack. If you want to dynamically memory for the variable, you can initialize it using the New operator. This would be done as follows: Public Module Exercise Public Structure Box End Structure Public Function Main() As Integer Dim ShoeBox As Box ShoeBox = New Box Return 0 End Function En
Custom Classes and Objects Custom Class Events --------------------------------------------------------------- In vba you can create your own custom objects by defining classes & inserting class modules. You can also create your own custom class events, in addition to Excel's own inbuilt event procedures. In this section we explain how to create custom objects by inserting a class module and how to create your own custom events in a class. Custom Classes and Objects In vba you can create your own custom objects by defining classes. Classes act as templates for new objects. The custom object is used to store, process and make data available. A Class contains data and code - data can be accessed with properties (viz. Name property) and the code is referred to as methods (which are defined as Subs and Functions in VBA). Classes are integral to the Object-Oriented Programming (OOP) language. A class is created by inserting a Class Module (in your VBA project) to which you give a name. A Class Module allows you to create your own objects having their own properties and methods much like other objects such as range, worksheet, chart, etc. The Class Module has its own set of vba code (which includes variables, constants and procedures), which defines its properties and methods. The properties of the class object are manipulated in a Class Module with Property procedures which use the Property Let, Property Get, and Property Set statements. To access the properties and methods of the class object from a procedure in a code module, you declare an object variable of the class's type in that procedure. You can do all vba programming without creating custom objects which do not really increase code functionality. However, using custom objects makes complex coding look simpler by having related code in one place, makes coding self-documenting with appropriately named classes, properties & methods, and this helps in