Freetutes.com

VB6 beginners tutorial - Learn VB6

Advanced VB6 tutorial - Learn Advanced VB6

VB .NET - Learn Visual Basic .NET

Systems Analysis - System analysis and Design tutorial for Software Engineering

Browse Topics

- Getting started
- Data Types
- Modules
- Operators in VB6
- VB6 Variable
- VB6 Procedures
- VB6 Control Structures
- Loops in VB6
- VB6 Exit Do & With End With
- Arrays in VB6
- User-Defined Data Types
- VB6 Constants
-
VB6 Built-in Functions
- Date and Time in VB6
- VB6 Controls
- TextBox Control
- ComboBox & OptionButton
- Label & Frame
- PictureBox & ImageBox
- Timer Control
- ListBox & ComboBox
- VB6 ScrollBar
- Control Arrays in VB6
- Files controls in VB6
- VB6 CheckBox
- Forms in VB6
- Menus in VB6
- MDI Form in VB6
- InputBox
- MessageBox
- Mouse events
- Mouse Move
- Error Handling
-
Error Handling (2)
-
VB6 Database


You are here: Visual Basic > VB6 (Beginners Tutorial)

Previous Page | Table of Contents | Next Page

User-Defined Data Types in Visual Basic 6

Variables of different data types when combined as a single variable to hold several related informations is called a User-Defined data type.

A Type statement is used to define a user-defined type in the General declaration section of a form or module. User-defined data types can only be private in form while in standard modules can be public or private. An example for a user defined data type to hold the product details is as given below.

Private Type ProductDetails
ProdID as String
ProdName as String
Price as Currency
End Type

The user defined data type can be declared with a variable using the Dim statement as in any other variable declaration statement. An array of these user-defined data types can also be declared. An example to consolidate these two features is given below.

Dim ElectronicGoods as ProductDetails ' One Record
Dim ElectronicGoods(10) as ProductDetails ' An array of 11 records

A User-Defined data type can be referenced in an application by using the variable name in the procedure along with the item name in the Type block. Say, for example if the text property of a TextBox namely text1 is to be assigned the name of the electronic good, the statement can be written as given below.

Text1.Text = ElectronicGoods.ProdName

If the same is implemented as an array, then the statement becomes

Text1.Text = ElectronicGoods(i).ProdName

User-defined data types can also be passed to procedures to allow many related items as one argument.

Sub ProdData( ElectronicGoods as ProductDetails)
Text1.Text = ElectronicGoods.ProdName
Text1.Text = ElectronicGoods.Price
End Sub

Related Topics


  

<< Previous | Contents | Next >>

   

Home | Link to Us | About Us | Privacy Policy | Contact Us

Copyright © Freetutes.com | All Rights Reserved