EmfPlusRecordType.EmfExtTextOutW

http://forums.devx.com/showthread.php?t=155532 
  Private Function LabelEnumerateMetafileProc( _
        ByVal recordType As EmfPlusRecordType, _
        ByVal flags As Integer, _
        ByVal dataSize As Integer, _
        ByVal data As IntPtr, _
        ByVal callbackData As PlayRecordCallback) As Boolean
  

        Dim DataArray As Byte() = Nothing
        If Not IntPtr.Zero.Equals(data) Then
            DataArray = New Byte(dataSize) {}
            Marshal.Copy(data, DataArray, 0, dataSize)
        End If
  
        If recordType = EmfPlusRecordType.EmfExtTextOutW Then
            Dim nChars As Int32 = Marshal.ReadInt32(data, 36)
            Dim TextUTF16 As New System.Text.UnicodeEncoding
            Dim TextString As String = TextUTF16.GetString(DataArray, Marshal.ReadInt32(data, 40) - 8, nChars * 2)
  
            If TextString Like "*pattern*" Then
                '
                ' (text replacement code here)
                '
                Return True
            End If
          End If

        LabelMetafile.PlayRecord(recordType, flags, dataSize, DataArray)

        Return True

    End Function


Offset       Size	Type

------------ ---------- ----------------
  
-8           4          emr.iType (the EmfPlusRecordType)

-4           4          emr.nSize

0            4          rclBounds.left (header is excluded, so record data actually starts here)

4            4          rclBounds.top
  
8            4          rclBounds.right

12           4          rclBounds.bottom

16           4          iGraphicsMode

20           4          exScale

24           4          eyScale

  28           4          ptlReference.x

32           4          ptlReference.y

36           4          nChars

40           4          offString

44           4          fOptions

48           4          rcl.left
  
52           4          rcl.top

56           4          rcl.right

60           4          rcl.bottom

64           4          offDx

68           nChars*2	(string)

68+nChars*2  nChars*4	(intercharacter spacings)