Components Chris North cs3724: HCI

Presentations taylor mitchell chris henry Vote: UI Hall of Fame/Shame?

Quiz Fill in the blank: Users tasks are ___technology_____-free. Why do you need a repaint procedure? Window rearranging causes erasing Must be prepared to repaint at any time

Object-oriented vs. Component-oriented Code Customized by editing code Language dependent Compiled binary Often UI focused Customize by methods, properties Events Portable, language independent Market-able!

Technologies Microsoft dll OLE ActiveX / COM (component object model).Net Java JavaBeans

2 Types of ActiveX Components ActiveX Controls Widgets that can go on a form *.ocx, *.oca ActiveX Executables / dll’s Independent programs that can be controlled “OLE Automation” *.exe, *.dll, *.tlb

Controls in VB Project | components | controls E.g. a webbrowser control

ActiveX Exe in VB Project | references E.g. controlling IE

Object Models

VB Object Browser

Creating controls VB: “user control” project

Databases Tables –Fields = Columns = attributes –Records = Rows = items –Values = Cells Queries

Database Components Microsoft: ODBC DAO (data access objects) Old style, more complete ADO (ActiveX data objects) New style, less complete

ADO Components Data connection “DSN=MS Access 97 Database; DBQ=c:\states.mdb;” Recordset Contains 1 row at a time Fields

ADO in VB Data connector Data widgets Accessing data

Next Project 1 due feb 7 (1 week) Presentations: Next Tues: john charonko, jaime spicciati Next Thurs: terrence witt, mohamed hassoun