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## 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
Theses functions remove data from the end of the header of message _msg_.
The `nng_msg_header_chop` 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
[horizontal]
`NNG_EINVAL`:: The message header is too short to remove the requested data.
### See Also
xref:nng_msg_header.adoc[nng_msg_header],
xref:nng_msg_header_append.adoc[nng_msg_header_append],
xref:nng_msg_header_insert.adoc[nng_msg_header_insert],
xref:nng_msg_header_len.adoc[nng_msg_header_len],
xref:nng_msg_header_trim.adoc[nng_msg_header_trim]
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