How can user select a directory to pull images from?

I have written a program/gui to take images and allow a user to define a start frame and an index for which images are desired and file these certain images in a new folder and location. Previously, I was just opening the images up in my directory and "add(ing) to path". But I am trying to allow the user to tell you where you get the images and the way I am doing gives an error. I am leaving out some code that I didn't think was relevant. I am including the error at the bottom. Any advice on how to get the user to be able to enter in the location of the original folder/files of interest would be appreciated.

f= figure;

whatpath = 'Where are your unindexed images?';
BackSlash = '\';

wdinput = uicontrol(f,'style', 'pushbutton','string', whatpath,
'position', [100,350,360,20], 
'callback', 'whatpath = uigetdir;[filepath,whatdir]=fileparts(whatpath);WD = strcat(filepath,BackSlash,whatdir);set(gcbo,''String'',WD)');

whatdirectory = strcat(WD,'\',Ftype);
imagefiles = dir(whatdirectory);%Find the jpg files
nfiles = length(imagefiles);%How many files are there

for ii=start:nfiles
    currentfilename = imagefiles(ii).name;
    currentimage = imread(currentfilename);
    images{ii} = currentimage;
end
Error using imread>get_full_filename (line 516)
File "Image_S001_0001.tif" does not exist.

Error in imread (line 340)
    fullname = get_full_filename(filename);

Error in EveryNthforDIC (line 101)
    currentimage = imread(currentfilename);

[Stephen23]

'callback', 'whatpath = uigetdir;[filepath,whatdir]=fileparts(whatpath);WD = strcat(filepath,BackSlash,whatdir);set(gcbo,''String'',WD)'

Do NOT define the callback as a char vector. The MATLAB documentation specifically advises against doing this: "Defining a callback as a character vector is not recommended. The use of a function specified as function handle enables MATLAB to provide important information to your callback function." You should use a function handle. And pass the data properly using guidata or nested functions:

https://www.mathworks.com/help/matlab/creating_guis/share-data-among-callbacks.html

Answer 1

[Image Analyst]

Try this:

% User wants to specify a folder where the image files live.
startingFolder = pwd; % or wherever you want.
folder = uigetdir(startingFolder, 'Select folder');