[#BlockFilterIndex-LookupFilterHeader]
= xref:BlockFilterIndex.adoc[BlockFilterIndex]::LookupFilterHeader
:relfileprefix: ../
:mrdocs:

Get a single filter header by block.

== Synopsis

Declared in `<index/blockfilterindex.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[requires_capability(0x7f2e1b1592c8)]]
bool
LookupFilterHeader(
    xref:CBlockIndex.adoc[CBlockIndex] const* block_index,
    xref:uint256.adoc[uint256]& header_out);
----

== Return Value

True if the filter header was found.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *block_index*
| Block to look up the filter header for.
| *header_out*
| Set to the filter header that was found.
|===


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