# PetscHMapIVGetKeys
Get all keys from a hash table 
## Synopsis
```
#include <petsc/private/hashmapiv.h>
PetscErrorCode PetscHMapIVGetKeys(PetscHMapIV ht, PetscInt *off, PetscInt array[])
```

## Input Parameters

- ***ht    -*** The hash table
- ***off   -*** Input offset in array (usually zero)
- ***array -*** Array where to put hash table keys into



## Output Parameters

- ***off   -*** Output offset in array (output offset = input offset + hash table size)
- ***array -*** Array filled with the hash table keys





## See Also
 `PetscHSetIVGetSize()`, `PetscHMapIVGetVals()`

## Level
developer

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/include/petsc/private/generated_khash.h.html#PetscHMapIVGetKeys">include/petsc/private/generated_khash.h</A>


---
[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/include/petsc/private/generated_khash.h)


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