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# nng_aio_get_output
## NAME
nng_aio_get_output --- return output result
## SYNOPSIS
```c
#include <nng/nng.h>
void *nng_aio_get_output(nng_aio *aio, unsigned int index);
```
## DESCRIPTION
The `nng_aio_get_output()` function returns the output result at _index_
resulting from the asynchronous operation associated with _aio_.
The type and semantics of output parameters are determined by specific
operations.
> [!NOTE]
> If the _index_ does not correspond to a defined output for the operation,
> or the operation did not succeed, then the return value will be `NULL`.
> [!IMPORTANT]
> It is an error to call this function while the _aio_ is currently
> in use by an active asynchronous operation, or if no operation has been
> performed using the _aio_ yet.
## RETURN VALUES
The *index*th output from the operation, or `NULL`.
## SEE ALSO
[nng_aio_alloc][nng_aio_alloc],
[nng_aio_set_output](../aio_provider/nng_aio_set_output.md),
[nng_aio_result][nng_aio_result]
{{#include ../refs.md}}
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