# PetscViewerHDF5GetFileId
Retrieve the file id, this file ID then can be used in direct HDF5 calls 
## Synopsis
```
#include "petscviewerhdf5.h" 
PetscErrorCode PetscViewerHDF5GetFileId(PetscViewer viewer, hid_t *file_id)
```
Not collective


## Input Parameter

- ***viewer -*** the `PetscViewer`



## Output Parameter

- ***file_id -*** The file id





## See Also
 `PETSCVIEWERHDF5`, `PetscViewerHDF5Open()`

## Level
intermediate

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/sys/classes/viewer/impls/hdf5/hdf5v.c.html#PetscViewerHDF5GetFileId">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](/docs/manualpages/index.md)  
[Index of all manual pages](/docs/manualpages/singleindex.md)  
