Error using fseek Invalid file identifier. Use fopen to generate a valid file identifier.

Anybody knows why it comes up with this error at I = dicomread(fullFileName); line?

Here is my code:

filePatternu = fullfile(myFolder, 'test*.dcm*'); allFilesi = dir(filePatternu);

for k= 1: length(allFilesi) baseFileName = allFilesi(k).name; % e.g. "1.png" fullFileName = fullfile(myFolder, baseFileName); I = dicomread(fullFileName); end

Answer 1

[Jan]

After formatting (using the "{} Code" button...), your code looks fine:

filePatternu = fullfile(myFolder, 'test*.dcm*');
allFilesi    = dir(filePatternu);
for k = 1:length(allFilesi)
  baseFileName = allFilesi(k).name; % e.g. "1.png"
  fullFileName = fullfile(myFolder, baseFileName);
  I            = dicomread(fullFileName);
end

The only problem I can see is that this catches folders also, when their name match the ".dcm*" pattern. Try this:

allFilesi    = dir(filePatternu);
allFilesi([allFilesi.isdir]) = [];

Catching the problem is a good idea also:

for k = 1:length(allFilesi)
  baseFileName = allFilesi(k).name; % e.g. "1.png"
  fullFileName = fullfile(myFolder, baseFileName);
  try
    I = dicomread(fullFileName);
  catch ME
    error('Forum:My:Function', 'Failed to import file [%s]: %s', ...
          fullFileName, ME.message);
  end
end

Now you can see for which file the import is failing.

Another idea is that the file is used or removed by another application between the dir and the dicomread. Displaying the failing file will help you to identify the problem.