diff --git a/include/serial.h b/include/serial.h
index d81b7fe..185a50b 100644
--- a/include/serial.h
+++ b/include/serial.h
@@ -42,7 +42,9 @@ public:
     std::string GetTimeNow(){
         auto now = std::chrono::system_clock::now();
         auto now_c = std::chrono::system_clock::to_time_t(now);
-        return std::ctime(&now_c);
+        char buffer[32];
+        ctime_s(buffer, 32, &now_c);
+        return std::string(buffer);
     }
 
     template<SupportString T>
@@ -95,10 +97,12 @@ public:
         Log("Send: " + reallyCommand);
         std::this_thread::sleep_for(10ms);
         // char buffer[ser.available()] = {0};
-        char* buffer = (char*)malloc(sizeof(char)*ser.available());
-        std::cout<<sizeof(buffer)<<std::endl;
-        auto size = ser.readBytes(buffer, sizeof(buffer), timeout);
+        auto availableSize = ser.available();
+        auto buffer = new char[availableSize];
+        std::memset(buffer, 0, availableSize);
+        auto size = ser.readBytes(buffer, availableSize, timeout);
         if(size > 0){
+            buffer[size] = '\0';
             response = std::string(buffer);
             Log("Receive: " + response);
             delete[] buffer;
@@ -123,8 +127,9 @@ public:
         Log("Send : " + reallyCommand);
         while(std::chrono::system_clock::now() < endTime){
             std::this_thread::sleep_for(10ms);
-            auto buffer = new char[ser.available()];
-            auto size = ser.readBytes(buffer, sizeof(buffer), timeout);
+            auto availableSize = ser.available();
+            auto buffer = new char[availableSize];
+            auto size = ser.readBytes(buffer, availableSize, timeout);
             auto str = std::string(buffer);
             delete[] buffer;
             if(size > 0)