diff --git a/src/device/DeviceManager.cpp b/src/device/DeviceManager.cpp
index d8b27cb..2dc1f13 100644
--- a/src/device/DeviceManager.cpp
+++ b/src/device/DeviceManager.cpp
@@ -17,7 +17,17 @@ std::string getJsonFromPatInf(QObject* obj)
     return ((QString*)obj)->toStdString();
 }
 
+void ErrorCallback(const char * msg)
+{
+    QString m(msg);
+    THROW_ERROR(m);
+}
+
+
+
 void DeviceManager::initDevice() {
+    InitLib(ErrorCallback);
+
     deviceInfTimerID = startTimer(1000);
     // empty scan
     connect(EventCenter::Default(),&EventCenter::RequestEmptyScan,[=](QObject* sender, QObject* detail){
@@ -91,7 +101,7 @@ void DeviceManager::timerEvent(QTimerEvent *event) {
                 //preview scan
             else{
                 const char * data = GetPreviewData();
-                QByteArray bytes =QByteArray::fromRawData(data,40000);
+                QByteArray bytes =QByteArray::fromRawData(data,140*140);
                 TRIGGER_EVENT(GUIEvents::ResponsePreviewData, nullptr, (QObject*)(&bytes));
                 delete [] data;
             }
diff --git a/src/device/DeviceManager.h b/src/device/DeviceManager.h
index 9e59df6..686b58b 100644
--- a/src/device/DeviceManager.h
+++ b/src/device/DeviceManager.h
@@ -14,7 +14,6 @@ public:
         static DeviceManager manager;
         return &manager;
     }
-    void setDeviceErrorCallBack();
     void initDevice();
 
 protected: