VISUAL BASIC

VISUAL BASIC

1. Types of data

   • Boolean
     • Conditional (false / true)
   • Byte
     • 8-bit that can hold values of 0 to 255. useful for binary data.
   • Integer
     • 16-bit number which can range between - 32768 and 32767.
   • Long
     • it store values in a ranging from -79.228.162.514.264.337.593.543.950.335 up to 79.228.162.514.264.337.593.543.950.335 If the value does not contain a decimal.
   • Decima
     • 32-bit number ranging from-3. 402823E38 to - 1,401298 E-45 for negative values and from 1, 401298E-45 to 3. 402823E38 for values positive.
   • Single
     • length for a string text. It can contain a maximum of approximately 2 billion characters.
   • String
     • length for a string text. It can contain a maximum of approximately 2 billion characters.
   • Currency
     • It is in fact an integer type internally. It allows up to 15 digits to the left of the decimal point, resulting in a range of approximately -922.337.000.000.000 a +922.337.000.000.000.
   • Date
     • It stores a numeric value with special format that represents both the date and the hour
   • Object
     • It does not contain the value itself, but a pointer to the value
   • Variant
     • It stored numeric and non-numeric values
   • Double
     • Number of 64-bit floating point that is used when great precision is required

2. form: they are treated as controls with their properties, methods and events.

   • Name
     • It is necessary to call the form from the code.
   • Caption
     • Text that appears in the title of the form
   • Backcolor:
     • Background color of the form.
   • Forecolor
     • color of text in the form
   • WindowState:
     • It indicates the mode in which appears the form.
       • 0 - Normal
       • 1 minimized
       • 2 maximized.
   • MinButton y MaxButton
     • they support only the values True / False. Allow them to be enabled buttons, minimize and maximize, respectively a form.
   • Icon
     • that allows you to modify the icon that appears to the left of the bar of the title of any form
   • ControlBox
   • BorderStyle:
     • This property is having more options and which offers more possibilities to change the look of our forms.
       • 0- None
         • in this not appear edges or bar of title. It serves for screens of presentation at the beginning of our application
       • 1 - Fixed Single
       • 2 - Sizable
       • 3 - Fixed Dialog
       • 4 - Fixed ToolWindow
       • 5 - Sizable ToolWindow

3. Toolbars

   • The mouse cursor
   • Label
   • Picture
   • TextBox:
   • Frame
   • CommandButton
   • OptionButton
   • ComboBox
   • ListBox
   • HScroll:
   • VScroll
   • Timer
   • DriveBox
   • DirBox
   • FileList
   • Shape
   • Line
   • Image
   • Data

4. controls

   • 3 insertable objects
   • 1. intrinsic controls
   • 2 ActiveX controls
     • They are those controls that exist as separate files with .ocx file name extension

5. properties of objects

   • ScriptEngineMajorVersion
   • ScriptEngineMinorVersion
   • Timer
   • Today
   • ScriptEngineBuildVersion
   • TimeOfDay
   • Now
   • TimeString
   • ScriptEngine

6. control structures

   • Select...Case
     • that allows you to evaluate an expression once and run different sets of instructions based on different possible values
   • Try...Catch...Finally
     • They allow to execute a set of instructions in an environment that retains control if one of the statements causes an exception
   • If...Then...Else
     • They allow to test one or more conditions and run one or more statements depending on each condition

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