:orphan:
# PetscViewerHDF5OpenGroup
Open the HDF5 group with the name (full path) returned by `PetscViewerHDF5GetGroup()`, and return this group's ID and file ID. If `PetscViewerHDF5GetGroup()` yields NULL, then group ID is file ID. 
## Synopsis
```
#include "petscviewerhdf5.h" 
PetscErrorCode PetscViewerHDF5OpenGroup(PetscViewer viewer, const char path[], hid_t *fileId, hid_t *groupId)
```
Not Collective


## Input Parameters

- ***viewer -*** the `PetscViewer` of type `PETSCVIEWERHDF5`
- ***path -*** (Optional) The path relative to the pushed group



## Output Parameters

- ***fileId -*** The HDF5 file ID
- ***groupId -*** The HDF5 group ID





## Note
If path starts with '/', it is taken as an absolute path overriding currently pushed group, else path is relative to the current pushed group.
`NULL` or empty path means the current pushed group.

If the viewer is writable, the group is created if it doesn't exist yet.


## See Also
 [](sec_viewers), `PETSCVIEWERHDF5`, `PetscViewerHDF5Open()`, `PetscViewerHDF5PushGroup()`, `PetscViewerHDF5PopGroup()`, `PetscViewerHDF5GetGroup()`, `PetscViewerHDF5WriteGroup()`

## Level
intermediate

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/sys/classes/viewer/impls/hdf5/hdf5v.c.html#PetscViewerHDF5OpenGroup">src/sys/classes/viewer/impls/hdf5/hdf5v.c</A>


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[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/sys/classes/viewer/impls/hdf5/hdf5v.c)


[Index of all Viewer routines](index.md)  
[Table of Contents for all manual pages](/manualpages/index.md)  
[Index of all manual pages](/manualpages/singleindex.md)