bson_iter_init (3) Linux Manual Page
bson_iter_init() – The bson_iter_init() function shall initialize iter to iterate upon the BSON document bson. Upon initialization, iter is placed before the first element. Callers must call bson_iter_next(), bson_iter_find(), or bson_iter_find_case() to advance to an element.
Synopsis
bool
bson_iter_init (bson_iter_t *iter,
const bson_t *bson);
Parameters
- iter
- A bson_iter_t \&.
- bson
- A bson_t \&.
Description
The bson_iter_init(3) function shall initialize iter to iterate upon the BSON document bson \&. Upon initialization, iter is placed before the first element. Callers must call bson_iter_next(3) , bson_iter_find(3) , or bson_iter_find_case(3) to advance to an element.Returns
Returns true if the iter was successfuly initialized.Example
static void
print_doc_id (const bson_t *doc)
{
bson_iter_t iter;
bson_oid_t oid;
char oidstr[25];
if (bson_iter_init (&iter, doc) &&
bson_iter_find (&iter, "_id") &&
BSON_ITER_HOLDS_OID (&iter)) {
bson_iter_oid (&iter, &oid);
bson_oid_to_string (&oid, oidstr);
printf ("%s\n", oidstr);
} else {
printf ("Document is missing _id.\n");
}
}
/* alternatively */
static void
print_doc_id (const bson_t *doc)
{
bson_iter_t iter;
bson_oid_t oid;
char oidstr[25];
if (bson_iter_init_find (&iter, doc, "_id") &&
BSON_ITER_HOLDS_OID (&iter)) {
bson_iter_oid (&iter, &oid);
bson_oid_to_string (&oid, oidstr);
printf ("%s\n", oidstr);
} else {
printf ("Document is missing _id.\n");
}
}