Code for loading an image question.

Question

Luke 2013-4-20

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/72908-code-for-loading-an-image-question

Hi everyone,

I have this code for loading an image from the current directory. I can't see anything wrong with it but when I try and load an image from the list it just doesn't seem to display. Could someone quickly check over it and see where I have gone wrong? Sorry, new to MATLAB.

Thanks for your time everyone.

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Luke 2013-4-20

编辑：Walter Roberson 2013-4-20

在 MATLAB Online 中打开

function [] = GUI_25()
D = dir('*.jpg');  
S.NAM = {D(:).name};
S.fh = figure('units','pixels','position',[450 450 400 200],'menubar','none','name','Verify Password.','resize','off','numbertitle','off','name','GUI_25');
S.ls = uicontrol('style','list',...
                 'units','pix',...
                 'position',[10 60 380 120],...
                 'backgroundcolor','w',...
                 'string',S.NAM,...
                 'HorizontalAlign','left');
S.pb = uicontrol('style','push',...
                 'units','pix',...
                 'position',[10 10 380 40],...
                 'backgroundcolor','w',...
                 'HorizontalAlign','left',...
                 'string','Load Image',...
                 'fontsize',14,'fontweight','bold',...
                 'callback',{@pb_call,S});
function [] = pb_call(varargin)
S = varargin{3};
L = get(S.ls,{'string';'value'});
try
    L = L{1}{L{2}};
    X = imread(L);
    str = [L(1:end-4),'_',strrep(datestr(now,'HH:MM:SS'),':','_')];
    assignin('base',str,X)
catch
    fprintf('\t\t%s\n','No file selected, or read error.')
end

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Answer 1

Walter Roberson 2013-4-20

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https://ww2.mathworks.cn/matlabcentral/answers/72908-code-for-loading-an-image-question#answer_82915

You read the image and assign it to a variable in the base workspace, but you do not have any image() or imshow() call to display the image.

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Walter Roberson 2013-4-20

Note: using a dynamic variable name is not a good idea. How is the rest of your program going to know where to look to find the variable with the name you calculate in "str" ?

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