PETSc version 3.17.4
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# PetscViewerRead

Reads data from a PetscViewer

### Synopsis

    #include "petscviewer.h"
    PetscErrorCode  PetscViewerRead(PetscViewer viewer, void *data, PetscInt num, PetscInt *count, PetscDataType dtype)

Collective

### Input Parameters

| viewer | - The viewer
| data | - Location to write the data
| num | - Number of items of data to read
| datatype | - Type of data to read

### Output Parameters

| count | - number of items of data actually read, or NULL

### Notes

If datatype is PETSC_STRING and num is negative, reads until a newline character is found, until a maximum of (-num - 1) chars.

### See Also

PetscViewerASCIIOpen(), PetscViewerPushFormat(), PetscViewerDestroy(),
VecView(), MatView(), VecLoad(), MatLoad(), PetscViewerBinaryGetDescriptor(), PetscViewerBinaryGetInfoPointer(), PetscFileMode, PetscViewer

### Level

beginner

### Location

src/sys/classes/viewer/interface/view.c
Index of all Viewer routines
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Index of all manual pages