[#ASN1_i2d_fp]
= ASN1_i2d_fp
:mrdocs:

Encode an ASN.1 value to a FILE using a type‐specific i2d function.

== Synopsis

Declared in `<openssl/asn1.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
ASN1_i2d_fp(
    xref:i2d_of_void.adoc[i2d_of_void]* i2d,
    FILE* out,
    void const* x);
----

== Return Value

1 on success, or 0 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *i2d*
| Encoder such as i2d_X509.
| *out*
| Output FILE that receives the DER encoding.
| *x*
| Object to encode; must match the type expected by `i2d.`
|===


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