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