Position Property (SQLiteBlob)

In This Topic

Gets the current read position in the SQLiteBlob stream.

Syntax

Visual Basic
C#

'Declaration
 
Public Overrides Property Position As Long

public override long Position {get; set;}

Property Value

The current position within the SQLiteBlob stream.

Remarks

The stream must support seeking to get or set the position. Use the CanSeek property to determine whether the stream supports seeking.

Example

csharp

void ReverseBlob()
{
  byte[] byteArray = { (byte)'A', (byte)'B', (byte)'C' };
  SQLiteBlob blobFrom = new SQLiteBlob(byteArray);
  //blobFrom.ToString() = "ABC"

  SQLiteBlob blobTo = new SQLiteBlob();
  ........
  //reverse SQLiteBlob
  if (blobFrom.CanSeek && blobFrom.CanRead && blobTo.CanWrite)
    for (blobFrom.Seek(-1, System.IO.SeekOrigin.End); ;blobFrom.Position -= 2)
    {
      blobTo.WriteByte((byte)blobFrom.ReadByte());
      if (blobFrom.Position == 1) break;
    }
  //blobTo.ToString() = "CBA";
}

Visual Basic

Private Sub ReverseBlob()
  Dim byteArray As Byte() = New Byte() {AscW("A"c), AscW("B"c), AscW("C"c)}
  Dim blobFrom As New SQLiteBlob(byteArray)
  ' blobFrom.ToString() = "ABC"

  Dim blobTo As New SQLiteBlob
  ......
  ' reverse SQLiteBlob
  If ((blobFrom.CanSeek AndAlso blobFrom.CanRead) AndAlso blobTo.CanWrite) Then
    blobFrom.Seek(CLng(-1), System.IO.SeekOrigin.End)
    Do While True
      blobTo.WriteByte(CByte(blobFrom.ReadByte))
      If (blobFrom.Position = 1) Then
        Return
      End If
      blobFrom.Position = blobFrom.Position - 2
    Loop
  End If
  ' blobTo.ToString() = "CBA";
End Sub

Requirements

Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

Reference

SQLiteBlob Class
SQLiteBlob Members
CanSeek Property
Seek Method

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