How to read compound data with field of compound array type

hi, I have a MATLAB data file saved in Matlab 2012a, which is MATLAB 7.3 format(actually it is a HDF5 file as documented), here I will describe the file content.

In MATLAB 2012a, I have a variable of compound type, let say the variable is 'BigGrp', this variable contains two fields, 'Junk' and 'BigGrpExtern', while 'Junk' is a text type, with value 'Mess'(4 character string), and 'BigGrpExtern' is a array of two element, each element is of a compound data with a member field named 'Strs', 'Strs' is a array of two element, which is of a compound data with two member fields named 'ID' and 'Name', of Integer type and Text type.

The output in MATLAB 2012a

    >> BigGrp

    BigGrp = 

        MyGrpExtern: [1x2 struct]
               Junk: 'Mess'
                Ext: [1x1 struct]

    >> BigGrp.MyGrpExtern

    ans = 

    1x2 struct array with fields:
        Strs

My problem is: I need to read this data file into my application with HDF5 API(HDF5Dll.dll version 1.8.x), yet in HDFView 2.9, I see 'BigGrp' is treated as a Group, and 'BigGrpExtern' is a sub group, and 'BigGrpExtern' only have a Dataset named 'Strs', 'BigGrpExtern' does NOT have any attribute that indicate it contains two 'Strs' datasets. I know in HDF5, group does NOT have the concept of dimension, and the nested struct array(of 1 x 2) 'BigGrpExtern' in my MATLAB data file become a 'Strs' dataset in HDF5.

I wonder how I can get back all the data in 'BigGrpExtern', which is struct array(1 x 2) in MATLAB, but in HDF5, there is NO group array concept(or say group with dimension larger than 1 x 1).

I attach the sample file matlabv73Test.mat here, would you please help to check my problem kindly, thanks.

Sophy Huang

Answer 1

[Sophy Huang]

well, I find I can get back the data, there is '/#refs#' group, which contains what I need...