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# nng_aio_set_msg()
## NAME
nng_aio_set_msg --- set message for asynchronous send
## SYNOPSIS
```c
#include <nng/nng.h>
void nng_aio_set_msg(nng_aio *aio, nng_msg *msg);
```
## DESCRIPTION
The `nng_aio_set_msg()` function sets the message that will be used
for an asynchronous send operation (see
[`nng_send_aio()`][nng_send_aio]).
> [!IMPORTANT]
> The _aio_ must not have an operation in progress.
## SEE ALSO
[nng_aio_get_msg][nng_aio_get_msg],
[nng_send_aio][nng_send_aio],
[Messages][msg]
{{#include ../refs.md}}
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