18.4.2 Creating the Groups that Contain the Dataset
|For Standard||RESQML v2.0.1|
Groups are handled slightly differently when writing to a file: HDF5 does not create groups automatically when a Dataset path is supplied. Your application must do one of the following:
- If a group doesn’t yet exist, explicitly create each group.
- If a group does exist, open it before creating the dataset.
With the current HDF5 format, only two groups are required:
- The top-level RESQML group.
- A group for the object being stored, which has the object’s GUID as its name.
The top-level group is created using the FileID:
hid_t RESQMLGroup = H5Gcreate2(FileID, “RESQML”, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);
The object group is created using the RESQMLGroupID:
hid_t ObjectGroupID = H5Gcreate2(RESQMLGroup, ObjectGuidString, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);
Remember to close these IDs when you are finished with them.