add try catch and errordlg if file not found

@netcdf_native/private/read.m

@@ -18,12 +18,11 @@ end
 
 % check file validity
 % -------------------
-self.nc_id = netcdf.open(self.file, self.mode);
-if self.nc_id == -1
-  error(['netcdf:netcdf', ...
-    'The specified data file ''%s'' does not exist\n' ...
-    'or is not in the directory which is on the MATLAB path'],...
-    self.file);
+try
+  self.nc_id = netcdf.open(self.file, self.mode);
+catch me
+  errordlg(me.message, 'Read NetCDF file error');
+  error(me.identifier, me.message);
 end
 
 % update waitbar title with Tex mode disable
@@ -136,10 +135,10 @@ for id = 0:nvars-1
   % -------------------------------------
   try
     s.data__ = netcdf.getVar(self.nc_id, id);
-  
-  % under Matlab R2011b, getVar thrown an error when all _EXT dimensions
-  % are 0. In that case, set data to empty
-  % ------------------------------------------------------------------
+    
+    % under Matlab R2011b, getVar thrown an error when all _EXT dimensions
+    % are 0. In that case, set data to empty
+    % ------------------------------------------------------------------
   catch ME
     fprintf('Notice: netcdf_native:read: %s set to empty\n', varName);
     % fprintf('Notice: netcdf_native:read: %s: %s\n', varName, ME.message);
@@ -186,34 +185,34 @@ for id = 0:nvars-1
     end
   end
   
-%   % if var is char and as vertical alignment, transpose it
-%   % ------------------------------------------------------
-%   %         if xtype == self.NC_CHAR && (size(s.data__, 1) ~= 1)
-%   %           s.data__ = s.data__';
-%   %         end
-%   
-%   % add internal dimension__ member
-%   % Because MATLAB uses FORTRAN-style ordering, however, the order of
-%   % the dimension IDs is reversed relative to what would be obtained
-%   % from the C API
-%   % ----------------------------
-%   if length(dimids) > 1
-%     s.data__ = permute(s.data__, fliplr(1:length(dimids)));
-%     dimids = fliplr(dimids);
-%   end
+  %   % if var is char and as vertical alignment, transpose it
+  %   % ------------------------------------------------------
+  %   %         if xtype == self.NC_CHAR && (size(s.data__, 1) ~= 1)
+  %   %           s.data__ = s.data__';
+  %   %         end
+  %
+  %   % add internal dimension__ member
+  %   % Because MATLAB uses FORTRAN-style ordering, however, the order of
+  %   % the dimension IDs is reversed relative to what would be obtained
+  %   % from the C API
+  %   % ----------------------------
+  %   if length(dimids) > 1
+  %     s.data__ = permute(s.data__, fliplr(1:length(dimids)));
+  %     dimids = fliplr(dimids);
+  %   end
   
   % if var is char and as vertical alignment, transpose it
   % ------------------------------------------------------
   if xtype == self.NC_CHAR && (size(s.data__', 1) == 1)
     s.data__ = s.data__';
-  
-  % Because MATLAB uses FORTRAN-style indexing, we need to transpose
-  % N-D array (k,i,j,...) to (i,j,k,...) however, the order of
-  % the dimension IDs is reversed relative to what would be obtained
-  % from the C API
-  % If s.data__ is a vector, NetCDF API return vertical vector, 
-  % do nothing, it's OK
-  % -----------------------------------------------------------------
+    
+    % Because MATLAB uses FORTRAN-style indexing, we need to transpose
+    % N-D array (k,i,j,...) to (i,j,k,...) however, the order of
+    % the dimension IDs is reversed relative to what would be obtained
+    % from the C API
+    % If s.data__ is a vector, NetCDF API return vertical vector,
+    % do nothing, it's OK
+    % -----------------------------------------------------------------
   elseif length(dimids) > 1
     s.data__ = permute(s.data__, fliplr(1:length(dimids)));
     dimids = fliplr(dimids);