changed get camera method and do error check on each step

apiloader/PcoAPILoader.cpp

@@ -43,30 +43,36 @@ namespace PcoNS
 
         SLLoaderNS::SharedLibLoader<PcoInterfaces> pco_loader;
 
+        std::string libpath = lib_path+"/";
+
         if(det_type == 0) //clhs
+            libpath += libname_pcoclhs;
+
+        if(det_type == 1) //me4
+            libpath += libname_pcome4;
+
+
+        if(!(pco_loader.OpenLib(libpath)))
+        {
+            cerr << "Error opening :" << libpath 
+                << "det type : "<< det_type << endl;
+            return nullptr;
+        }
+
+        if(!(pco = pco_loader.GetInstance()))
         {
-            //try pco clhs then
-            std::string libpcoclhs = lib_path + "/" + libname_pcoclhs;
-            if((pco_loader.OpenLib(libpcoclhs)) && 
-                (pco = pco_loader.GetInstance()) &&
-                (pco->OpenCamera() == 0))
-                    return pco;
-            else
-                pco_loader.CloseLib();
-        }        
+            cerr << "Error on get instance" << endl;
+            pco_loader.CloseLib();
+            return nullptr;
+        }
 
-        if(det_type == 1)
+        if(!(pco->OpenCamera() == 0))
         {
-            // try pcome4 first
-            std::string libpcome4 = lib_path + "/" + libname_pcome4;
-        
-            if((pco_loader.OpenLib(libpcome4)) && 
-                (pco = pco_loader.GetInstance()) &&
-                (pco->OpenCamera() == 0))
-                    return pco;
-            else
-                pco_loader.CloseLib();
+            cerr << "Error on open camera" << endl;
+            pco_loader.CloseLib();    
+            return nullptr;
         }
-        return nullptr;
+        
+        return pco;
     }
 }
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