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BinaryReader.ReadInt32 Method

Reads a 4-byte signed integer from the current stream and advances the current position of the stream by four bytes.

Namespace:  System.IO
Assembly:  mscorlib (in mscorlib.dll)

Public Overridable Function ReadInt32 As Integer
Dim instance As BinaryReader 
Dim returnValue As Integer 

returnValue = instance.ReadInt32()

Return Value

Type: System.Int32
A 4-byte signed integer read from the current stream.


The end of the stream is reached.


The stream is closed.


An I/O error occurs.

BinaryReader does not restore the file position after an unsuccessful read.

BinaryReader reads this data type in little-endian format.

For a list of common I/O tasks, see Common I/O Tasks.

This code example is part of a larger example provided for the BinaryReader class.

Dim binReader As New BinaryReader( _
    File.Open(fileName, FileMode.Open))

    ' If the file is not empty, 
    ' read the application settings. 
    ' First read 4 bytes into a buffer to  
    ' determine if the file is empty. 
    Dim testArray As Byte() = {0,0,0,0}
    Dim count As Integer = binReader.Read(testArray, 0, 3)

    If count <> 0 Then 

        ' Reset the position in the stream to zero.
        binReader.BaseStream.Seek(0, SeekOrigin.Begin)

        aspRatio   = binReader.ReadSingle()
        lkupDir     = binReader.ReadString()
        saveTime  = binReader.ReadInt32()
        statusBar = binReader.ReadBoolean()
    End If 

' If the end of the stream is reached before reading 
' the four data values, ignore the error and use the 
' default settings for the remaining values. 
Catch ex As EndOfStreamException
    Console.WriteLine("{0} caught and ignored. " & _ 
        "Using default values.", ex.GetType().Name)
End Try

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC, Xbox 360, Zune

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 3.5, 2.0, 1.0

XNA Framework

Supported in: 3.0, 2.0, 1.0