Concepts Of Object-oriented Programming With Visual Basic

1 The Basics Of Object-oriented Programming.- Data Types.- Encapsulation.- Abstract Data Types.- Classes.- Defining A Class In Visual Basic.- Defining A Property In Visual Basic.- Defining A Method In Visual Basic.- Exposing Properties Through The Property Let Set Get Procedures.- Objects.- Explicit Object Creation.- Instance Variables And Member Variables.- The As Object Syntax.- Implicit Object Creation.- Referencing Public Variables And Procedures.- The Objectmessage Model.- The Me Keyword.- Object Properties And Object Hierarchies.- Creating And Destroying Objects.- Creating Objects.- Destroying Objects.- Reference Counts.- Circular References.- The Notorious End Statement.- How To Control A Circular Reference-a Linked List Example.- Form Modules.- Properties And Methods In A Form Module.- Collection Classes.- Constructing A Collection Class.- Polymorphism And Overloading.- Overloading.- Polymorphism.- Inheritance.- 2 Handling Object Errors.- Error Detection And Error Handling.- Types Of Errors.- The Error Object.- Dealing With Run-time Errors.- Where To Handle A Run-time Error.- Dealing With Logical Errors.- Detecting Logical Errors.- Where To Handle A Logical Error.- Handling The Error In The Calling Procedure.- Errors Occurring In Events.- An Error-handling Example.- 3 Turing Machines - A Simple Object-oriented Application.- What Is An Algorithm?.- What Is A Turing Machine?.- Informal Definition Of A Turing Machine.- Describing A Turing Machine.- Coding A Turing Machine.- Error Handling.- The Symbol Class.- The Symbols Collection Class.- The State Class.- The States Collection Class.- The Transition Class.- The Transitions Collection Class.- The Machine Class.- The User Interface.- The Standard Module.- A Final Comment.- 4 Ole Automation Objects.- What Is Ole Automation?.- Public Really Means Public.- The Plan For This Chapter.- Communication Between Ole Automation Clients And Servers.- The Communication Problem.- Supplying Information To The Client.- What Is