The basis and concept summary of the path of VB programming learning

oop (objectoriented programming) OO/object-oriented programming

object is a collection of code and data, three elements of an object: Properties, events, Methods

object's command rule: must start with a letter or a Chinese character , not a string that begins with a number, and its length <=127

Property: An object's properties are used to represent the state of an object and to control the appearance and behavior of the object. property setting method,[< object name;.] < property names >=< property values >

Event: An object's event is an action that is pre-set by the system that can be recognized and responded to by the object, and the event of the object is divided into three types

(1) User event (2) system event (3) Indirect event

Methods: The object's method is the object to perform the action, the object method call format,[< object name;] Method name [(parameter)]

>>>>>>>>>>>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>

About the height, Width, top, and left properties of a control

The height and Width properties determine the heights and widths of the control , the top and left properties determine the position of the control in the form

The top left corner of the form is the coordinate origin, in Twip ( twips ) .

The basis and concept summary of the path of VB programming learning