Read(Byte[],Int32,Int32) Method

In This Topic

Syntax
Remarks
Example
See Also

Reads a sequence of bytes from the current OracleLob stream and advances the position within the stream by the number of bytes read.

Syntax

Visual Basic
C#

public override int Read( 
   byte[] buffer,
   int offset,
   int count
)

'Declaration
 
Public Overloads Overrides Function Read( _
   ByVal buffer() As Byte, _
   ByVal offset As Integer, _
   ByVal count As Integer _
) As Integer

Parameters

buffer: The byte array buffer to be populated.
offset: The zero-based byte offset in the buffer.
count: The amount of bytes to read.

Return Value

The total number of bytes read into the buffer.

Remarks

The Read method reads a maximum of bytes from the current stream and stores them in buffer beginning at position. The current position within the stream is advanced by the number of bytes read. The Read method returns 0 if the position is at the end of the stream.

Example

In the example below a OracleLob is created with 10 bytes in it. Then Position is changed using Seek method. An attempt to read 10 bytes is made afterwards, however, only 5 bytes remain till the end of the stream, so TargetArray is populated with 5 bytes only.

csharp

public void ReadFromMyLob() 
{ 
        byte[] myByteArray = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10}; 
        byte[] TargetArray = new Byte[15]; 
        OracleLob myLob = new OracleLob(OracleDbType.Blob);
        myLob.Write(myByteArray, 0, 10); 
        myLob.Seek(5, SeekOrigin.Begin); 
        Console.WriteLine(myLob.Read(TargetArray, 0, 10) + " bytes are read"); 
}

Visual Basic

Public Sub ReadFromMyLob()
        Dim myByteArray As Byte() = New Byte() { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 }
        Dim TargetArray As Byte() = New Byte(15  - 1) {}
        Dim myLob As New OracleLob(3)
        myLob.Write(myByteArray, 0, 10)
        myLob.Seek(5, SeekOrigin.Begin)
        Console.WriteLine((myLob.Read(TargetArray, 0, 10) & " bytes are read"))
End Sub

Reference

OracleLob Class
OracleLob Members
Overload List
Seek Method
Write Method

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