Compound Type and how to read a variable-length of 64-bit floating-point (double* array) ?

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Hi,

Here's my problem:
I have to read a dataset (HDF5 Compund DataSet)
ex:
label size needComputation dataArray
1 200 0 {222, 222.5, 223, 223.5,...}
3 100 1 {710, 712, 724, 756,...}
8 2 1 {3.753, 0}
to this structure:

typedef struct
{
unsigned int label;
unsigned long long size;
bool needComputation;
double* dataArray;
} my_data_type;

I can read label, size, needComputation but not dataArray which is a Variable-length of 64-bit floating-point.

For bool type I use:

EnumType boolEnumType(sizeof(bool));
bool falseValue = 0;
bool trueValue = 1;
boolEnumType.insert("FALSE", &falseValue);
boolEnumType.insert("TRUE", &trueValue);

// compound type
CompType mtype( sizeof(my_data_type) );

mtype.insertMember( "Label", HOFFSET(my_data_type, label), PredType::NATIVE_UINT);
mtype.insertMember( "size", HOFFSET(my_data_type, size), PredType::NATIVE_UINT64);
mtype.insertMember( "NeedComputation", HOFFSET(my_data_type, isEven), boolEnumType);
//mtype.insertMember( "DataArray", HOFFSET(my_data_type, dataArray), PredType::H5T_IEEE_F64LE);
// This last line give me: CompType::insertMember H5Tinsert failed

DataSpace ds = dataset.getSpace();

hssize_t n = sid1.getSimpleExtentNpoints();
my_data_type* mdt = new my_data_type[n];
dataset.read( mdt, mtype);

for( int i = 0; i < n; i++)
{
cout <<"label " << mdt[i].label << " size "<< mdt[i].size << " needComputation "<< mdt[i].needComputation << endl;
}

delete[] mdt;

ยทยทยท

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So, how can I read "dataArray" of double and know the size of this array ?
I haven't find any example about this in c++.

Thank you for your help.