Export (0) Print
Expand All
Expand Minimize

My.Computer.FileSystem.WriteAllBytes Method

Writes data to a binary file.

' Usage
My.Computer.FileSystem.WriteAllBytes(file ,data ,append)
' Declaration
Public Sub WriteAllBytes( _
   ByVal file As String, _
   ByVal data As Byte(), _
   ByVal append As Boolean _
)

file

String. Path and name of the file to be written to. Required.

data

Byte. Data to be written to the file. Required.

append

Boolean. Whether to append or overwrite data. Default is False. Required.

The following conditions may create an exception:

If the append parameter is True, it appends the data to the file; otherwise data in the file is overwritten.

If the specified path, excluding the file name, is not valid, a DirectoryNotFoundException exception will be thrown. If the path is valid but the file does not exist, the file is created.

NoteNote:

The WriteAllBytes method opens a file, writes to it, and then closes it. Code that uses the WriteAllBytes method is simpler than code that uses a BinaryWriter object. However, if you are adding data to a file using a loop, a BinaryWriter object can provide better performance because you only have to open and close the file once.

The following table lists an example of a task involving the My.Computer.FileSystem.WriteAllBytes method.

This example appends the data array CustomerData to the file CollectedData.

My.Computer.FileSystem.WriteAllBytes _
("C:\MyDocuments\CustomerData", CustomerData, True)

Namespace: Microsoft.VisualBasic.MyServices

Class: FileSystemProxy (provides access to FileSystem)

Assembly: Visual Basic Runtime Library (in Microsoft.VisualBasic.dll)

Availability by Project Type

Project type

Available

Windows Application

Yes

Class Library

Yes

Console Application

Yes

Windows Control Library

Yes

Web Control Library

Yes

Windows Service

Yes

Web Site

Yes

The following permission may be required.

Permission

Description

FileIOPermission

Controls the ability to access files and folders. Associated enumeration: Unrestricted.

For more information, see Code Access Security and Requesting Permissions.

Community Additions

ADD
Show:
© 2014 Microsoft