# MPI_Info_get_valuelen

## NAME

MPI_Info_get_valuelen − Retrieves the length of the key value associated with an info object.

## SYNTAX

## C Syntax

#include <mpi.h>
int MPI_Info_get_valuelen(MPI_Info info, char *key,

|  | int *valuelen, int *flag)

## Fortran Syntax

INCLUDE ’mpif.h’
MPI_INFO_GET_VALUELEN(INFO, KEY, VALUELEN, FLAG, IERROR)

| INTEGER |  |  |  | INFO, VALUELEN, IERROR
| LOGICAL |  |  |  | FLAG
| CHARACTER*(*) |  |  |  | KEY

## C++ Syntax

#include <mpi.h>
bool MPI::Info::Get_valuelen(const char* key, int& valuelen)

| const

## INPUT PARAMETERS

| info |  | Info object (handle). |
| key |  | Key (string). |

## OUTPUT PARAMETERS

| valuelen |  | Length of value arg (integer).
| flag |  | Returns true if key defined, false if not (boolean).
| IERROR |  | Fortran only: Error status (integer).

## DESCRIPTION

MPI_Info_get_valuelen retrieves the length of the value associated with key. If key is defined, valuelen is set to the length of its associated value and flag is set to true. If key is not defined, valuelen is not touched and flag is set to false. The length returned in C or C++ does not include the end-of-string character.

If key is larger than MPI_MAX_INFO_KEY, the call is erroneous.

## ERRORS

Almost all MPI routines return an error value; C routines as the value of the function and Fortran routines in the last argument. C++ functions do not return errors. If the default error handler is set to MPI::ERRORS_THROW_EXCEPTIONS, then on error the C++ exception mechanism will be used to throw an MPI:Exception object.

Before the error value is returned, the current MPI error handler is called. By default, this error handler aborts the MPI job, except for I/O function errors. The error handler may be changed with MPI_Comm_set_errhandler; the predefined error handler MPI_ERRORS_RETURN may be used to cause error values to be returned. Note that MPI does not guarantee that an MPI program can continue past an error.

## SEE ALSO

MPI_Info_get
MPI_Info_get_nkeys
MPI_Info_get_nthkey

MPI API Index