sir i have a code which i want to use in image steganography but whenever i am trying to take that code and use in my gui its showing me error

i want to use this code in my gui but i want to retrieve the image from the previous button and whenever im using the previous button its showing me error

the code which i want to use

c = imread('images.jpg');
    message = 'hellokarthick'
    message = strtrim(message);
    m = length(message) * 8;
    AsciiCode = uint8(message); 
    binaryString = transpose(dec2bin(AsciiCode,8));
    binaryString = binaryString(:);
    N = length(binaryString);
    b = zeros(N,1); %b is a vector of bits
    for k = 1:N
        if(binaryString(k) == '1')
            b(k) = 1;
        else
            b(k) = 0;
        end
    end
    s = c;
    height = size(c,1);
    width = size(c,2);
    k = 1;
    for i = 1 : height
        for j = 1 : width
             LSB = mod(double(c(i,j)), 2);
            if (k>m || LSB == b(k))
                s(i,j) = c(i,j);
            else
                if(LSB == 1)
                    s(i,j) = c(i,j) - 1;
                else
                    s(i,j) = c(i,j) + 1;
                end
            k = k + 1;
        end
        end
    end
     imwrite(s, 'hiddenmsgimage.bmp');

the code which i am using

c = imread('get(handles.filename, 'String');');
    message = 'handles.edit2, 'String''
    message = strtrim(message);
    m = length(message) * 8;
    AsciiCode = uint8(message); 
    binaryString = transpose(dec2bin(AsciiCode,8));
    binaryString = binaryString(:);
    N = length(binaryString);
    b = zeros(N,1); %b is a vector of bits
    for k = 1:N
        if(binaryString(k) == '1')
            b(k) = 1;
        else
            b(k) = 0;
        end
    end
    s = c;
    height = size(c,1);
    width = size(c,2);
    k = 1;
    for i = 1 : height
        for j = 1 : width
             LSB = mod(double(c(i,j)), 2);
            if (k>m || LSB == b(k))
                s(i,j) = c(i,j);
            else
                if(LSB == 1)
                    s(i,j) = c(i,j) - 1;
                else
                    s(i,j) = c(i,j) + 1;
                end
            k = k + 1;
        end
        end
    end
     imwrite(s, 'hiddenmsgimage.bmp');

Answer 1

[Walter Roberson]

Replace

c = imread('get(handles.filename, 'String');');

with

filename = get(handles.filename, 'String');
c = imread(filename);

[Image Analyst]

Better yet, just use dir() to load the image names into a listbox so the user can easily click on a name to select it. Why force your user to have to know the filename and type it in? Don't be cruel to your users.

Answer 2

[eng]

plz, where is the decoding part ? can you continue it plz to be more useful for us :)