= nng_msg_header_trim(3) :doctype: manpage :manmanual: nng :mansource: nng :manvolnum: 3 :copyright: Copyright 2018 mailto:info@staysail.tech[Staysail Systems, Inc.] + \ Copyright 2018 mailto:info@capitar.com[Capitar IT Group BV] + \ {blank} + \ This document is supplied under the terms of the \ https://opensource.org/licenses/MIT[MIT License]. == NAME nng_msg_header_trim, nng_msg_header_trim_u32 - remove data from start of message header == SYNOPSIS [source, c] ----------- #include int nng_msg_header_trim(nng_msg *msg, size_t size); int nng_msg_header_trim_u32(nng_msg *msg, uint32_t *val32); ----------- == DESCRIPTION The `nng_msg_header_trim()` and `nng_msg_header_trim_u32()` functions remove data from the start of the header of message _msg_. The first function removes _size_ bytes. The second function removes 4 bytes, and stores them in the value _val32_, after converting them from network-byte order (big-endian) to native byte order. == RETURN VALUES This function returns 0 on success, and non-zero otherwise. == ERRORS `NNG_EINVAL`:: The message header is too short to remove the requested data. == SEE ALSO <>, <>, <>, <>, <>, <>, <>, <>, <> == COPYRIGHT {copyright}