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# PetscViewerASCIIRead
Reads from a `PETSCVIEWERASCII` file 
## Synopsis
```
#include "petscviewer.h" 
PetscErrorCode PetscViewerASCIIRead(PetscViewer viewer, void *data, PetscInt num, PetscInt *count, PetscDataType dtype)
```
Only MPI rank 0 in the `PetscViewer` may call this


## Input Parameters

- ***viewer -*** the `PETSCVIEWERASCII` viewer
- ***data -*** location to write the data, treated as an array of type indicated by `datatype`
- ***num -*** number of items of data to read
- ***datatype -*** type of data to read



## Output Parameter

- ***count -*** number of items of data actually read, or `NULL`





## See Also
 [](sec_viewers), `PetscViewerASCIIOpen()`, `PetscViewerPushFormat()`, `PetscViewerDestroy()`, `PetscViewerCreate()`, `PetscViewerFileSetMode()`, `PetscViewerFileSetName()`
`VecView()`, `MatView()`, `VecLoad()`, `MatLoad()`, `PetscViewerBinaryGetDescriptor()`,
`PetscViewerBinaryGetInfoPointer()`, `PetscFileMode`, `PetscViewer`, `PetscViewerBinaryRead()`

## Level
beginner

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/sys/classes/viewer/impls/ascii/filev.c.html#PetscViewerASCIIRead">src/sys/classes/viewer/impls/ascii/filev.c</A>


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