CanRead Property (PgSqlBlob)
Gets a value indicating whether the PgSqlBlob stream can be read.
public override bool CanRead {get;}
'Declaration
Public Overrides ReadOnly Property CanRead As Boolean
Property Value
true if the
PgSqlBlob stream supports reading;
false if a
PgSqlBlob is closed, disposed, or
Null.
void ReverseBlob()
{
byte[] byteArray = { (byte)'A', (byte)'B', (byte)'C' };
PgSqlBlob blobFrom = new PgSqlBlob(byteArray);
//blobFrom.ToString() = "ABC"
PgSqlBlob blobTo = new PgSqlBlob();
........
//reverse PgSqlBlob
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";
}
Private Sub ReverseBlob()
Dim byteArray As Byte() = New Byte() {AscW("A"c), AscW("B"c), AscW("C"c)}
Dim blobFrom As New PgSqlBlob(byteArray)
' blobFrom.ToString() = "ABC"
Dim blobTo As New PgSqlBlob
......
' reverse PgSqlBlob
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