[#PeerManager-FetchBlock]
= xref:PeerManager.adoc[PeerManager]::FetchBlock
:relfileprefix: ../
:mrdocs:

Attempt to manually fetch block from a given peer. We must already have the header.

== Synopsis

Declared in `<net_processing.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
virtual
xref:util/Expected-0b.adoc[util::Expected<void, std::string>]
FetchBlock(
    xref:NodeId-08.adoc[NodeId] peer_id,
    xref:CBlockIndex.adoc[CBlockIndex] const& block_index) = 0;
----

== Return Value

An empty result on success, or an error message describing why the fetch could not be started.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *peer_id* [in]
| The peer id
| *block_index* [in]
| The blockindex
|===


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