file name is related to instance name of the server

agipdmaster/AGIPDMaster.cpp

@@ -268,6 +268,22 @@ namespace AGIPDMaster_ns
             }
         }
 
+
+        //get the device instance name
+        //it will be used to generate save file name
+        for(int i=0;i<m_vobjDP.size();i++)
+        {
+            string strServerID = m_vobjDP[i]->info().server_id;
+            std::size_t stFound = strServerID.find_first_of('/');
+            if(stFound != std::string::npos)
+                strServerID = strServerID.substr(stFound+1,strServerID.length()-stFound-1);
+            else
+                strServerID = to_string(i);
+            m_vDevName.push_back(strServerID);
+            
+            // cout<<strServerID<<endl;   
+        }
+        
         //m_thAcq = new AcquisitionThread(this,m_mtxAcq);
         set_state(Tango::OFF);
     
@@ -1369,7 +1385,8 @@ namespace AGIPDMaster_ns
     
         if(strVal!=string("") && strVal!=string("test"))
         {
-            strVal = strVal.substr(3,(strVal.length()-1));//remove m1_ prefix
+            std::size_t stFound = strVal.find_first_of('_');
+            strVal = strVal.substr(stFound+1,(strVal.length()-1-stFound));//remove m1_ prefix 
             *attr_FilePrefix_read = CORBA::string_dup(strVal.c_str());
         }
     
@@ -1779,8 +1796,7 @@ namespace AGIPDMaster_ns
         
     
         /*----- PROTECTED REGION END -----*/	//	AGIPDMaster::stop_acq
-
-    }
+}
 
 //--------------------------------------------------------
 /**
@@ -1874,7 +1890,7 @@ namespace AGIPDMaster_ns
             {
                 string strTmp;
                 if(strAttr == string("FilePrefix"))
-                    strTmp = string("m")+to_string(static_cast<long long int>(nIdx))+string("_")+strVal;
+                    strTmp = m_vDevName[i]+string("_")+strVal;
                 else
                     strTmp = strVal;
             

agipdmaster/AGIPDMaster.h

@@ -59,6 +59,7 @@ class AGIPDMaster : public Tango::Device_4Impl
     string m_strMsg;
     Tango::DevState m_stateDetLatest;
     vector<Tango::DeviceProxy*> m_vobjDP;
+    vector<string> m_vDevName;
     
     omni_thread* m_thAcq;
     omni_mutex m_mtxAcq;