1.修复dlt645规约，界面上显示报文长度为0的bug。2.优化前端报文显示16进制换行问题

Author: 600888

CHANGELOG.md

@@ -0,0 +1,3 @@
+# 更新日志
+## [1.0.0] - 2026-2-21
+- 初始版本发布

front/src/components/device/MessageViewDialog.vue

@@ -217,7 +217,9 @@ onUnmounted(() => {
   .hex-data {
     font-family: 'Consolas', 'Monaco', monospace;
     font-size: 13px;
-    word-break: break-all;
+    word-break: break-word;
+    overflow-wrap: break-word;
+    white-space: normal;
     color: var(--text-primary, #333);
   }
 

src/device/core/message/message_formatter.py

@@ -138,16 +138,23 @@ def get_messages(self, limit: Optional[int] = None) -> List[dict]:
             elif is_iec104 and raw_hex:
                 description = IEC104MessageParser.parse(raw_hex)
 
+            # 原始16进制数据和长度
+            hex_data = msg.get("hex_string", msg.get("data", ""))
+            length = msg.get("length", 0)
+            if not length and hex_data:
+                # 从hex_data计算字节长度
+                length = len(hex_data.replace(" ", "")) // 2
+
             result.append({
                 "sequence_id": msg.get("sequence_id", 0),
                 "timestamp": msg.get("timestamp", 0),
                 "formatted_time": msg.get("time", msg.get("formatted_time", "")),
                 "direction": direction,
                 "msg_type": msg_type,
-                "hex_data": msg.get("hex_string", msg.get("data", "")),
+                "hex_data": hex_data,
                 "raw_hex": raw_hex,
                 "description": description,
-                "length": msg.get("length", 0),
+                "length": length,
             })
 
         # 按序号正序排列