[#node-BlockManager-ReadBlock-02]
= xref:node.adoc[node]::xref:node/BlockManager.adoc[BlockManager]::ReadBlock
:relfileprefix: ../../
:mrdocs:

`ReadBlock` overloads

== Synopses

Declared in `<node/blockstorage.h>`

Read a block from disk using its block index entry.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
bool
xref:node/BlockManager/ReadBlock-09.adoc[ReadBlock](
    xref:CBlock.adoc[CBlock]& block,
    xref:CBlockIndex.adoc[CBlockIndex] const& index) const;
----

[.small]#xref:node/BlockManager/ReadBlock-09.adoc[_» more..._]#

Functions for disk access for blocks


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
bool
xref:node/BlockManager/ReadBlock-00.adoc[ReadBlock](
    xref:CBlock.adoc[CBlock]& block,
    xref:FlatFilePos.adoc[FlatFilePos] const& pos,
    std::optional<uint256> const& expected_hash) const;
----

[.small]#xref:node/BlockManager/ReadBlock-00.adoc[_» more..._]#

== Return Value

* True on success, false if the block could not be read.
* True on success, false if the block could not be read or verified.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *block*
| Output filled with the deserialized block.
| *index*
| The block index entry identifying the block to read.
| *pos*
| Position of the serialized block on disk.
| *expected_hash*
| Expected block hash used to verify the read, if provided.
|===


[.small]#Created with https://www.mrdocs.com[MrDocs]#