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.TH "BSON_ITER_INIT_FROM_DATA" "3" "Jun 04, 2021" "1.17.6" "libbson"
.SH NAME
bson_iter_init_from_data \- bson_iter_init_from_data()
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.SH SYNOPSIS
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.INDENT 3.5
.sp
.nf
.ft C
bool
bson_iter_init_from_data (bson_iter_t *iter, const uint8_t *data, size_t length);
.ft P
.fi
.UNINDENT
.UNINDENT
.SH PARAMETERS
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.IP \(bu 2
\fBiter\fP: A \fBbson_iter_t\fP\&.
.IP \(bu 2
\fBdata\fP: A buffer to initialize with.
.IP \(bu 2
\fBlength\fP: The length of \fBdata\fP in bytes.
.UNINDENT
.SH DESCRIPTION
.sp
The \fBbson_iter_init_from_data()\fP function shall initialize \fBiter\fP to iterate upon the buffer \fBdata\fP, which must contain a BSON document. Upon initialization, \fBiter\fP is placed before the first element. Callers must call \fBbson_iter_next()\fP, \fBbson_iter_find()\fP, or \fBbson_iter_find_case()\fP to advance to an element.
.SH RETURNS
.sp
Returns true if the iter was successfully initialized.
.SH EXAMPLE
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.nf
.ft C
static void
print_doc_id (const uint8_t *data, size_t length)
{
   bson_iter_t iter;
   bson_oid_t oid;
   char oidstr[25];

   if (bson_iter_init_from_data (&iter, data, length) && bson_iter_find (&iter, "_id") &&
       BSON_ITER_HOLDS_OID (&iter)) {
      bson_iter_oid (&iter, &oid);
      bson_oid_to_string (&oid, oidstr);
      printf ("%s\en", oidstr);
   } else {
      printf ("Document is missing _id.\en");
   }
}
.ft P
.fi
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.SH AUTHOR
MongoDB, Inc
.SH COPYRIGHT
2017-present, MongoDB, Inc
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