Fixed bug for length attribute

AttributeCombiner.cpp

@@ -1213,8 +1213,40 @@ void AttributeCombiner::add_dynamic_commands()
 
         if (isNumber(item->lengthAttName))
             length = atol(item->lengthAttName.c_str());
-        else
-            self->read_attribute(item->lengthAttName) >> length;
+        else {
+
+          Tango::DeviceAttribute da = self->read_attribute(item->lengthAttName);
+          switch( da.get_type() ) {
+            case Tango::DEV_SHORT: {
+              Tango::DevShort val;
+              da >> val;
+              length = (Tango::DevLong) val;
+            }
+            break;
+            case Tango::DEV_USHORT: {
+              Tango::DevUShort val;
+              da >> val;
+              length = (Tango::DevLong) val;
+            }
+            break;
+            case Tango::DEV_LONG: {
+              da >> length;
+            }
+            break;
+            case Tango::DEV_ULONG: {
+              Tango::DevULong val;
+              da >> val;
+              length = (Tango::DevLong) val;
+            }
+            break;
+            default:
+              Tango::Except::throw_exception(
+                      (const char *) "AttributeCombiner::error_read",
+                      (const char *) "Type unsupported for attLength",
+                      (const char *) "AttributeCombiner::read_dynspec_attributes");
+          }
+
+        }
 
         int blockSize = length * nbAtt;
         Tango::DevDouble *result = new Tango::DevDouble[length * size];