[#CMessageHeader-2constructor-0e4]
= xref:CMessageHeader.adoc[CMessageHeader]::CMessageHeader
:relfileprefix: ../
:mrdocs:

Construct a P2P message header from message‐start characters, a message type and the size of the message.

== Synopsis

Declared in `<protocol.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
CMessageHeader(
    xref:MessageStartChars.adoc[MessageStartChars] const& pchMessageStartIn,
    char const* msg_type,
    unsigned int nMessageSizeIn);
----

== Description

[NOTE]
====
Passing in a `msg_type` longer than MESSAGE_TYPE_SIZE will result in a run‐time assertion error.

====

== Parameters

[cols="1,4"]
|===
| Name| Description
| *pchMessageStartIn*
| Network magic bytes marking the start of the message.
| *msg_type*
| Null‐terminated message type string.
| *nMessageSizeIn*
| Size of the message payload in bytes.
|===


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