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## 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.
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`.
### Return Values
The __index__th result of the operation, or `NULL`.
### See Also
xref:../iop/nng_aio_set_input.adoc[nng_aio_set_input],
xref:nng_aio_result.adoc[nng_aio_result]
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