Name
VBFixedString Attribute
Class
Microsoft.VisualBasic.VBFixedStringAttribute
Applies to
Field
Description
Defines a fixed-length string. It is the rough equivalent of the VB 6 declaration:
Dim s As String * length
It can be used to define fixed-length strings within structures, particularly structures that are to be passed to Win32 API functions, as well as to define fixed length strings to be written to and read from random access files.
Constructor
New(length
)
-
length
(Integer) The length of the string
Properties
- Length (Integer)
Read-only. The length of the string. Its value is set by the
length
parameter in the class constructor.
Example
The example creates a random access file, which must contain
fixed-length records, and uses the
<VBFixedString>
attribute to create a
fixed-length string of 10 characters. This ensures that all records
will be a uniform length. Without the
<VBFixedString>
attribute, the example an
IOException exception because of bad record length.
Option Strict Off Imports Microsoft.VisualBasic Imports System Module modMain Structure Person <vbFixedString(10)> Public Name As String Public Age As Short End Structure Public Sub Main Dim APerson As New Person( ) Dim fr As Integer = FreeFile( ) FileOpen(fr, ".\person.txt", OpenMode.Random, OpenAccess.ReadWrite, _ OpenShare.Default, len(aperson)) APerson.Name = "John" APerson.Age = 31 FilePut(fr, APerson, 1) APerson.Name = "Jane" APerson.Age = 27 FilePut(fr, APerson, 2) FileGet(fr, APerson, 2) Console.WriteLine(Trim(APerson.Name) ...
Get VB.NET Language in a Nutshell, Second Edition now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.