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program create_vgroup
implicit none
C
C Parameter declaration
C
character*15 FILE_NAME
C
parameter (FILE_NAME = 'Two_Vgroups.hdf')
integer DFACC_CREATE
parameter (DFACC_CREATE = 4)
C
C Function declaration
C
integer hopen, hclose
integer vfstart, vfatch, vfdtch, vfend
C
C**** Variable declaration *******************************************
C
integer status
integer file_id
integer vgroup1_id, vgroup2_id, vgroup_ref
C
C**** End of variable declaration ************************************
C
C
C Create the HDF file.
C
file_id = hopen(FILE_NAME, DFACC_CREATE, 0)
C
C Initialize the V interface.
C
status = vfstart(file_id)
C
C Create the first vgroup. Note that the vgroup reference number is set
C to -1 for creating and the access mode is 'w' for writing.
C
vgroup_ref = -1
vgroup1_id = vfatch(file_id, vgroup_ref, 'w')
C
C Create the second vgroup.
C
vgroup2_id = vfatch(file_id, vgroup_ref, 'w')
C
C Any operations on the vgroups.
C
C ..............................
C
C Terminate access to the first vgroup.
C
status = vfdtch(vgroup1_id)
C
C Terminate access to the second vgroup.
C
status = vfdtch(vgroup2_id)
C
C Terminate access to the V interface and close the HDF file.
C
status = vfend(file_id)
status = hclose(file_id)
end
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