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# PetscHMapIJGetKeys
Get all keys from a hash table 
## Synopsis
```
#include <petsc/private/hashmapij.h>
PetscErrorCode PetscHMapIJGetKeys(PetscHMapIJ ht, PetscInt *off, struct {PetscInt i, j;} 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
 `PetscHSetIJGetSize()`, `PetscHMapIJGetVals()`

## Level
developer

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


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