moving config dialog to app_config

deltatau.py

@@ -17,9 +17,7 @@ class Deltatau:
   def __init__(self):
     app=QApplication.instance()
     cfg=app._cfg
-    # cfg.setValue(AppCfg.DELTATAU_HOST, 'SAR-CPPM-EXPMX1')
-    cfg.setValue(AppCfg.DELTATAU_HOST, 'localhost:10001:10002')
-    host=cfg.value(AppCfg.DELTATAU_HOST)
+    host=cfg.value(AppCfg.DT_HOST)
 
     hpp=host.split(':')
     param={'host':hpp[0]}
@@ -28,7 +26,12 @@ class Deltatau:
     if len(hpp)>2:
       param['fast_gather_port']=int(hpp[2])
       _log.info(' -> ssh-tunneling PPComm({host}:{port} {host}:{fast_gather_port})'.format(**param))
-    self._comm=comm=PPComm(**param)
-    self._gather=gather=Gather(comm)
+
+    try:
+      self._comm=comm=PPComm(**param)
+      self._gather=gather=Gather(comm)
+    except AttributeError as e:
+      _log.critical('can not connect to deltatau')
+      return
     verbose=0xff
     self._shapepath=sp=shapepath.ShapePath(comm, gather, verbose, sync_mode=1, sync_flag=3)