[#BIO_get_ex_data]
= BIO&lowbar;get&lowbar;ex&lowbar;data
:mrdocs:

Retrieve application data previously stored on a BIO with BIO&lowbar;set&lowbar;ex&lowbar;data()&period;

== Synopsis

Declared in `&lt;openssl&sol;bio&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void*
BIO&lowbar;get&lowbar;ex&lowbar;data(
    xref:BIO.adoc[BIO] const* bio,
    int idx);
----

== Return Value

Stored pointer, or NULL if unset&period;

== Parameters

[cols="1,4"]
|===
| Name| Description
| *bio*
| BIO to query&period;
| *idx*
| Ex&hyphen;data index from BIO&lowbar;get&lowbar;ex&lowbar;new&lowbar;index() or a class&hyphen;specific allocator&period;
|===


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