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# nng_msg_header_chop
## NAME
nng_msg_header_chop --- remove data from end of message header
## SYNOPSIS
```c
#include <nng/nng.h>
int nng_msg_header_chop(nng_msg *msg, size_t size);
int nng_msg_header_chop_u16(nng_msg *msg, uint16_t *val16);
int nng_msg_header_chop_u32(nng_msg *msg, uint32_t *val32);
int nng_msg_header_chop_u64(nng_msg *msg, uint64_t *val64);
```
## DESCRIPTION
The `nng_msg_header_chop()` family of functions removes
data from the end of the header of [message][msg] _msg_.
The first function removes _size_ bytes.
The remaining functions remove 2, 4, or 8 bytes, and stores them in the value
(such as _val32_),
after converting them from network-byte order (big-endian) to native
byte order.
## RETURN VALUES
These function return 0 on success, and non-zero otherwise.
## ERRORS
- `NNG_EINVAL`: The message header is too short to remove the requested data.
## SEE ALSO
[nng_msg_header][nng_msg_body],
[nng_msg_header_append][nng_msg_header_append],
[nng_msg_header_insert][nng_msg_header_insert]
[nng_msg_header_len][nng_msg_header_len],
[nng_msg_header_trim][nng_msg_header_trim]
{{#include ../refs.md}}
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