how to quickly rename file in MATLAB?how to change file extension quickly in batch?

how to quickly rename file in MATLAB?

how to change file extension quickly in batch?

method 1.

by movefile

eg.

movefile(‘test.txt’,’test.test’); rename file test.txt to test.test.test

but this is a very inefficient function

method 2.

invoke java machine

eg.

java.io.File('test.txt ').renameTo(java.io.File('test.test '));

this is super faster than movefile function

then … using java to do file extension rename

usage:

DirStruct=dir('*.txt');

ChangeFileExtension(DirStruct,'.m');

change all *.txt file to *.m

function ChangeFileExtension(DirStruct,NewExtension)

% author Laiso Taiwan

% extension ,such as '.txt'

% if no extension then append

% else remove old extension and appent the new one

% 'name' char

% 'date' char

% 'bytes' 1*1 double

% 'isdir' 1*1 logic

% 'datenum' 1*1 double

StructFields={'name'

'date'

'bytes'

'isdir'

'datenum'};

if(~isequal(fieldnames(DirStruct),StructFields))

error('input is not dir struct');

end

if ~(ischar(DirStruct(1).name)&&ischar(DirStruct(1).date)&&isa(DirStruct(1).bytes,'double') ...

&&numel(DirStruct(1).bytes)==1&&isa(DirStruct(1).isdir,'logical')...

&&numel(DirStruct(1).isdir)==1&&isa(DirStruct(1).datenum,'double')&&numel(DirStruct(1).datenum)==1)

error('input is not dir struct');

end

for i=1:numel(DirStruct)

Dot=find(DirStruct(i).name=='.',1,'last');

if ~isempty(Dot)

%movefile(DirStruct(i).name,[DirStruct(i).name(1:Dot-1) NewExtension]);

java.io.File(DirStruct(i).name).renameTo(java.io.File([DirStruct(i).name(1:Dot-1) NewExtension]));

else

% movefile(DirStruct(i).name,[DirStruct(i).name NewExtension]);

java.io.File(DirStruct(i).name).renameTo(java.io.File([DirStruct(i).name NewExtension]));

end

end