解决查看录像页 UI

2026-07-28 14:59:34 +08:00
parent 1096645e79
commit 9e72bc522e
7 changed files with 183 additions and 34 deletions
@@ -0,0 +1,142 @@
+import 'package:dio/dio.dart';
+import 'package:flutter/foundation.dart';
+import 'package:network_info_plus/network_info_plus.dart';
+
+/// 局域网 NAS IP 探测（结果仅存内存静态字段）。
+class UtilSearchNasIp {
+  UtilSearchNasIp._();
+
+  static const String _defaultPreUrl = 'http://192.168.1.';
+  static const String _probePath =
+      ':5666/sac/rpcproxy/v1/new-user-guide/status';
+  static const Duration _timeout = Duration(seconds: 1);
+
+  /// 命中的 NAS IPv4（仅内存，进程内有效）。
+  static String? nasIp;
+
+  /// 并发扫同网段 1～255，超时 1s；首个有 HTTP 响应者写入 [nasIp] 并返回。
+  static Future<String?> discover() async {
+    if (nasIp != null && nasIp!.isNotEmpty) {
+      return nasIp;
+    }
+
+    final startedAt = DateTime.now();
+    final preUrl = await _resolvePreUrl();
+    final dio = Dio(
+      BaseOptions(
+        connectTimeout: _timeout,
+        receiveTimeout: _timeout,
+        sendTimeout: _timeout,
+        validateStatus: (_) => true,
+      ),
+    );
+    final cancelToken = CancelToken();
+
+    try {
+      await Future.wait([
+        for (var host = 1; host <= 255; host++)
+          _probeHost(
+            dio: dio,
+            cancelToken: cancelToken,
+            preUrl: preUrl,
+            host: host,
+            startedAt: startedAt,
+          ),
+      ]);
+      if (nasIp == null) {
+        final elapsedMs = DateTime.now().difference(startedAt).inMilliseconds;
+        debugPrint('NAS 探测未命中，总耗时: ${elapsedMs}ms');
+      }
+      return nasIp;
+    } finally {
+      dio.close(force: true);
+    }
+  }
+
+  /// 由本机 Wi‑Fi IPv4 推导 `http://a.b.c.`，失败则用默认网段。
+  static Future<String> _resolvePreUrl() async {
+    try {
+      final wifiIp = await NetworkInfo().getWifiIP();
+      if (wifiIp == null || wifiIp.isEmpty) return _defaultPreUrl;
+      final parts = wifiIp.split('.');
+      if (parts.length != 4) return _defaultPreUrl;
+      return 'http://${parts[0]}.${parts[1]}.${parts[2]}.';
+    } catch (_) {
+      return _defaultPreUrl;
+    }
+  }
+
+  /// 探测单个主机；任意 HTTP 响应视为命中。
+  static Future<void> _probeHost({
+    required Dio dio,
+    required CancelToken cancelToken,
+    required String preUrl,
+    required int host,
+    required DateTime startedAt,
+  }) async {
+    if (cancelToken.isCancelled || nasIp != null) return;
+
+    final target = '$preUrl$host$_probePath';
+    try {
+      await dio.get<dynamic>(target, cancelToken: cancelToken);
+      _onHit(preUrl, host, cancelToken, startedAt);
+    } on DioException catch (error) {
+      if (error.type == DioExceptionType.cancel) return;
+      // 带 response 的 DioException 也表示已连通
+      if (error.response != null) {
+        _onHit(preUrl, host, cancelToken, startedAt);
+      }
+    } catch (_) {
+      // 超时 / 连接失败：未命中
+    }
+  }
+
+  /// 记录命中：写 [nasIp]、打印 IP 与总耗时，并取消其余请求。
+  static void _onHit(
+    String preUrl,
+    int host,
+    CancelToken cancelToken,
+    DateTime startedAt,
+  ) {
+    if (nasIp != null) return;
+    final ip = '${_hostPrefix(preUrl)}$host';
+    nasIp = ip;
+    final elapsedMs = DateTime.now().difference(startedAt).inMilliseconds;
+    debugPrint('NAS IP: $ip，探测总耗时: ${elapsedMs}ms');
+    if (!cancelToken.isCancelled) {
+      cancelToken.cancel('nas-found');
+    }
+  }
+
+  /// `http://192.168.1.` → `192.168.1.`
+  static String _hostPrefix(String preUrl) {
+    return preUrl.replaceFirst(RegExp(r'^https?://'), '');
+  }
+}
+
+// ---------------------------------------------------------------------------
+// 调用案例
+// ---------------------------------------------------------------------------
+//
+// 1) Auth 页静默探测（不阻塞登录）：
+//
+//   import 'dart:async';
+//   import 'package:recording_tool/core/utils/util_search_nasIp.dart';
+//
+//   WidgetsBinding.instance.addPostFrameCallback((_) {
+//     unawaited(UtilSearchNasIp.discover());
+//   });
+//
+// 2) 业务侧读取已命中 IP：
+//
+//   final ip = UtilSearchNasIp.nasIp;
+//   if (ip != null) {
+//     final base = 'http://$ip:5666';
+//     // 使用 base 访问 NAS...
+//   }
+//
+// 3) 主动等待探测结果（少用，会阻塞当前异步流程）：
+//
+//   final ip = await UtilSearchNasIp.discover();
+//   debugPrint('result: $ip');
+//