VISUAL BASIC

VISUAL BASIC

1. Controls

   • In visual basic there are three general categories of controls: intrinsic controls, ActiveX controls, insertable objects
     • Intrinsic controls: These controls are located within the visual basic executable file. Intrinsic controls are always included in the toolbox, not like ActiveX controls which can be removed or added to the toolbox
     • ActiveX controls: Are those controls that exist as independent files with extension file name .ocx. These include the controls available in all editions Of visual Basic ( grid controls, combo box and list linked to data and several others ).
     • Insertable objects: As a microsoft Excel Worksheet object that contains the list of your company´s employees, or a Microssoft Project calendar object that contains the calendar information of a project

2. Consist of a code editor

3. Tool box

   • Icons in the toolbox can be dragged into the design view or pasted into a code editor
     • The pointer: Is the only tool in the boox that you can not use to draw a control
     • Picture Box: The tool for images is used to show a graph
     • Label: The label tool is used to draw a box for the text that you now want a user to modify

4. Forms

   • The forms are treated as controls with their properties, events and methods.
     • Name: name of the form, necessary to call the form from the code.
     • Caption: Text that appears in the form title.
     • Backcolor: Background color of the form
     • Forecolor: color of the form text.

5. Properties

   • DateString: Returns or sets a String value that represents the current date according to the system.
   • Now: Returns a Date value that contains the current that and time according to the system.
   • ScriptEngine: Returns a String object that represents the current runtime that is used.
   • ScriptEngineBuildVersion: Returns a value of integer type that contains the compilation version number of the runtime engine that is used.
   • ScriptEngineMajorversion: Returns a value of integer type that contains the main version number of the runtime engine that is used.
   • ScriptEngineMinorVersion: Returns a value of integer type that contains the secondary version number of the runtime engine that is used.
   • TimeOfDay: Return of sets a Date value that contains the current time of day according to the system.
   • Timer: Returns a Double value that represents the number of seconds since midnight.
   • TimeString: Returns or sets a value of type String that represents the current time of day according to the system.
   • Today: Returns or sets a Date value that contains the current date according to the system.

6. Type of data

   • All the values that need to be manipulated in a program can be stored temporarily in a variable, the variables are those that must belong to a data type, where the data type determines the range of value or sets of values that said variable could use.
     • There are 12 functions
       • Boolean
       • Byte
       • Integer
       • Date
       • Variant
       • Double
       • String
       • Decimal
       • Long
       • Currency
       • Object
       • Single

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