diff --git a/src/device/DeviceManager.cpp b/src/device/DeviceManager.cpp
index 9031ff9..45867d5 100644
--- a/src/device/DeviceManager.cpp
+++ b/src/device/DeviceManager.cpp
@@ -56,7 +56,9 @@ void DeviceManager::initDevice() {
     connect(EventCenter::Default(),&EventCenter::RequestEmptyScan,[=](QObject* sender, QObject* detail){
         std::string json= getJsonFromPatInf(detail);
         qDebug()<<json.c_str();
-        processScan(json.c_str(), true);
+        void * jss = malloc(json.size());
+        memcpy(jss,json.c_str(),json.size());
+        processScan((char*)jss,true);
     });
     // Patient scan
     connect(EventCenter::Default(),&EventCenter::RequestPatientScan,[=](QObject* sender, QObject* detail){
@@ -64,7 +66,9 @@ void DeviceManager::initDevice() {
         qDebug()<<json.c_str();
         if (!json.empty())
         {
-            processScan(json.c_str());
+            void * jss = malloc(json.size());
+            memcpy(jss,json.c_str(),json.size());
+            processScan((char*)jss);
         }
     });
     // stop