# PetscViewerHDF5HasAttribute
Check whether an attribute exists 
## Synopsis
```
#include "petscviewerhdf5.h" 
PetscErrorCode PetscViewerHDF5HasAttribute(PetscViewer viewer, const char parent[], const char name[], PetscBool *has)
```
Collective


## Input Parameters

- ***viewer -*** The `PETSCVIEWERHDF5` viewer
- ***parent -*** The parent dataset/group name
- ***name   -*** The attribute name



## Output Parameter

- ***has    -*** Flag for attribute existence





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


## See Also
 `PETSCVIEWERHDF5`, `PetscViewerHDF5Open()`, `PetscViewerHDF5HasObjectAttribute()`, `PetscViewerHDF5WriteAttribute()`, `PetscViewerHDF5ReadAttribute()`, `PetscViewerHDF5PushGroup()`, `PetscViewerHDF5PopGroup()`, `PetscViewerHDF5GetGroup()`

## Level
advanced

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/sys/classes/viewer/impls/hdf5/hdf5v.c.html#PetscViewerHDF5HasAttribute">src/sys/classes/viewer/impls/hdf5/hdf5v.c</A>

## Implementations

<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/sys/classes/viewer/impls/hdf5/hdf5v.c.html#PetscViewerHDF5HasAttribute_Internal">PetscViewerHDF5HasAttribute_Internal in src/sys/classes/viewer/impls/hdf5/hdf5v.c</A><BR>


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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)  
