跳到主要内容

browse_with_paging

browse 只返回 references 列表, 丢弃 continuation_point, 适合"已知小节点"场景. 大节点 (子节点 100+) 用 browse_with_paging 显式拿到 BrowsePage.

前置阅读

签名​

def browse_with_paging(self,
                       node_id: str,
                       filter: NodeClass = NodeClass.Unspecified) -> BrowsePage: ...

用法​

page = ua.browse_with_paging("ns=2;s=BigFolder")
print(f"Got {len(page.references)} children, more = {page.continuation_point is not None}")

if page.continuation_point is not None:
    nxt = ua.browse_next(page.continuation_point)
    print(f"Next page: {len(nxt.references)} more children")

何时用 browse vs browse_with_paging​

场景API
已知节点子数 ≤ 50, 不关心分页browse(...)
不确定子数, 安全起见browse_with_paging(...) + 循环 browse_next
100+ 子节点的大节点browse_with_paging(...) 必选
一次 browse 多个节点browse_many(...) (注意当前 browse_many 不返回 ContinuationPoint)

完整模板​

from darra_opcua import OpcUaSession, NodeClass, Reference
from typing import List

def browse_all(ua: OpcUaSession,
               node_id: str,
               filter: NodeClass = NodeClass.Unspecified) -> List[Reference]:
    all_refs: List[Reference] = []
    page = ua.browse_with_paging(node_id, filter)
    all_refs.extend(page.references)
    while page.continuation_point is not None:
        page = ua.browse_next(page.continuation_point)
        all_refs.extend(page.references)
    return all_refs

下一步​