VB .NET Language in a Nutshell

Name

FileOpen Procedure

Class

Microsoft.VisualBasic.FileSystem

Syntax

FileOpen(filenumber, filename, mode, access, share, recordlength)

filenumber

Use: Required

Data Type: Integer

An available file number.

filename

Use: Required

Data Type: String

The name of the file to open, along with an optional path.

mode

Use: Optional

Data Type: OpenMode enum

The file-access mode. Options are: OpenMode.Append, OpenMode.Binary, OpenMode.Input, OpenMode.Output, or OpenMode.Random (the default value).

access

Use: Optional

Data Type: OpenAccess enum

Specifies the allowable operations by the current process. Options are: OpenAccess.Default, OpenAccess.Read, OpenAccess.ReadWrite (the default value), or OpenAccess.Write.

share

Use: Optional

Type: OpenShare enum

Specifies the allowable operations by other processes. Options are: OpenShare.Shared (the default value), OpenShare.LockRead, OpenShare.LockWrite, or OpenShare.LockreadWrite.

recordlength

Use: Optional

Data Type: Integer (at most, 32767)

The length of the record (for random access) or of the I/O buffer (for sequential access).

Description

Opens a disk file for reading and/or writing

Rules at a Glance

• There are three modes of file access: sequential, binary, and random. The Input, Output, and Append access modes are sequential access modes. Sequential access is designed for text files consisting of individual Unicode characters (and control codes). Most of the file-manipulation functions (LineInput, Print, PrintLine, and so on) apply to files opened for sequential ...