[#ASN1_item_i2d_bio]
= ASN1_item_i2d_bio
:mrdocs:

Encode an ASN.1 value to DER and write it to a BIO using an ASN1_ITEM.

== Synopsis

Declared in `<openssl/asn1.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
ASN1_item_i2d_bio(
    xref:ASN1_ITEM.adoc[ASN1_ITEM] const* it,
    xref:BIO.adoc[BIO]* out,
    void const* x);
----

== Return Value

1 on success, or 0 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *it*
| Item descriptor identifying the type of `x.`
| *out*
| BIO that receives the DER encoding.
| *x*
| Value to encode; must match the type described by `it.`
|===


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