HDF5DotNet - Read string variable dataset

I need read a dataset of string variable type.
My actual code is:

Dim dataSpace = H5D.getSpace(d.id)
Dim dataType = H5D.getType(d.id)
Dim size = H5S.getSimpleExtentDims(dataSpace)

Dim outdata(255) As Byte
'(Size has length=0)

Dim wrapArray = New H5Array(Of Byte)(outdata)
H5D.read(d.id, dataType, wrapArray)

Not work correctly and not found any info in this forum.