diff --git a/src/slam_wrapper.cpp b/src/slam_wrapper.cpp
index 0724569..fe1da82 100644
--- a/src/slam_wrapper.cpp
+++ b/src/slam_wrapper.cpp
@@ -23,47 +23,39 @@
 }
 
 void SlamWrapper::qt_notice_handler(const void *message) {
-    const auto seq = static_cast<const String_ *>(message);
-    std::string str_;
+    int index_, begin_, end_, feedback_, arrive_;
+    auto seq = static_cast<const String_ *>(message);
+    std::string str_, notice_;
 
-    int begin_ = seq->data().find("index:", 0); // Instruction unique identifier
-    int end_ = seq->data().find(";", begin_);
+    begin_ = seq->data().find("index:", 0); // Instruction unique identifier
+    end_ = seq->data().find(";", begin_);
     str_ = seq->data().substr(begin_ + 6, end_ - begin_ - 6);
-    char *endptr = nullptr;
-    if (*endptr != '\0') {
-        std::cerr << "Error converting index to integer" << std::endl;
-        return;
-    }
-    const int index = static_cast<int>(strtol(str_.c_str(), &endptr, 10));
+    index_ = atoi(str_.c_str());
 
     begin_ = seq->data().find("notice:", 0); // Prompt message
     end_ = seq->data().find(";", begin_);
-    std::string notice_ = seq->data().substr(begin_ + 7, end_ - begin_ - 7);
+    notice_ = seq->data().substr(begin_ + 7, end_ - begin_ - 7);
 
     if (index <= 10000) {
         // Command execution feedback
         begin_ = seq->data().find("feedback:", 0);
         end_ = seq->data().find(";", begin_);
         str_ = seq->data().substr(begin_ + 9, end_ - begin_ - 9);
-        const long feedback_ = strtol(str_.c_str(), &endptr, 10);
-        if (*endptr != '\0') {
-            std::cerr << "Error converting feedback to integer" << std::endl;
-            return;
-        }
-        std::cout << "index:" << index << " feedback:" << feedback_ << " notice:" << notice_ << std::endl;
+        feedback_ = atoi(str_.c_str());
+        if (feedback_ == 0 || feedback_ == -1)
+            std::cout << "\033[1;31m"
+                    << "Command execution failed with index = " << index_ << "."
+                    << "\033[0m";
+        std::cout << notice_ << std::endl;
     } else if (index == 10001) {
         // Navigation feedback
         begin_ = seq->data().find("arrive:", 0);
+        begin_ = seq->data().find("arrive:", 0);
         end_ = seq->data().find(";", begin_);
         str_ = seq->data().substr(begin_ + 7, end_ - begin_ - 7);
-        // 巡检到达的位置，判断到达的是第几个点
-        const long arrive = strtol(str_.c_str(), &endptr, 10);
-        if (*endptr != '\0') {
-            std::cerr << "Error converting arrive to integer" << std::endl;
-            return;
-        }
-        std::cout << "index:" << index << " arrive:" << arrive << " notice:" << notice_ << std::endl;
-        if (arrive == 1) {
+        arrive_ = atoi(str_.c_str());
+        std::cout << " I arrived node " << arrive_ << ". " << notice_ << std::endl;
+        if (arrive_ == 1) {
             //发送暂停指令
             pause_navigation();