diff --git a/lib/secDetector_sdk.cpp b/lib/secDetector_sdk.cpp
index 33e5bef081ac7d732916e3a90c8bd8ab5408d2c8..65efceb6e67bc64931915caa9c431c6de428be8b 100644
--- a/lib/secDetector_sdk.cpp
+++ b/lib/secDetector_sdk.cpp
@@ -104,16 +104,16 @@ void secUnsub(const int topic, void *reader)
 	}
 }
 
-const char *secReadFrom(void *reader)
+void secReadFrom(void *reader, char *data, int data_len)
 {
-	string msg;
+	string msg("");
 
 	Readmao::iterator iter = g_reader_map.find(reader);
         if (iter != g_reader_map.end()) {
 		msg = g_client.ReadFrom(iter->second);
         }
 
-	return msg.c_str();
+	strncpy(data, msg.c_str(), data_len - 1);
 }
 
 #ifdef __cplusplus
diff --git a/lib/secDetector_sdk.h b/lib/secDetector_sdk.h
index cf67a8919969912cb57836022a517d19c83548c2..d5935b1d4099f8826ef2248b24a3caead33c5b96 100644
--- a/lib/secDetector_sdk.h
+++ b/lib/secDetector_sdk.h
@@ -50,6 +50,6 @@
 
 void *secSub(const int topic);
 void secUnsub(const int topic, void *reader);
-const char *secReadFrom(void *reader)
+void secReadFrom(void *reader, char *data, int data_len);
 
 #endif