send better error message in c++, pass along in py

components/iscesys/ImageApi/DataAccessor/bindings/DataAccessormodule.cpp

@@ -143,8 +143,7 @@ createAccessor_C(PyObject* self, PyObject* args)
   }
   catch(const std::exception& e)
   {
-    std::cerr << e.what() << '\n';
-    PyErr_SetString(PyExc_OSError, "Failed to created DataAccessor.");
+    PyErr_SetString(PyExc_OSError, e.what());
     return NULL;
   }
 

components/iscesys/ImageApi/InterleavedAccessor/src/GDALAccessor.cpp

@@ -72,19 +72,19 @@ GDALAccessor::openFile (string filename, string accessMode, GDALDataset ** fd)
         (*fd) = (GDALDataset *) GDALOpenShared (filename.c_str (), GA_ReadOnly);
         if ((*fd) == NULL)
         {
-	    cout << "Error. Cannot open the file " << filename << " in "
-		    << accessMode << " mode." << endl;
-        throw runtime_error("GDAL file open error.");
+            string errMsg = "Cannot open the file " + filename + " in "
+                            + accessMode + " mode.";
+            throw runtime_error(errMsg);
             // ERR_MESSAGE
-	    ;
+            // ;
         }
     }
     else
     {
-	cout << "Error. Only read mode is available and not " << accessMode
-		<< " mode." << endl;
-	ERR_MESSAGE
-	;
+        string errMsg = "Error. Only read mode is available and not " + accessMode + " mode.";
+        throw runtime_error(errMsg);
+        // ERR_MESSAGE
+        // ;
     }
 
 }