switch case in GUI pop-up menu

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Chethan
Chethan 2013-3-28
I've a pop-up menu with 5,10,15,20 the contents in that menu. using switch I've created this, what changes i need to do with this statement?
val=get(hObject,'value');
switch val
case '5'
n=5;
case '10'
n=10;
case '15'
n=15;
case '20'
n=20;
end
handles.n = val;
guidata(hObject, handles);
where it represents number of output images. I'm suppose to get 5 images at output if user selects 5 in pop-up menu, 10 images if 10 is selected and so on.... But I'm getting only 1 image if i select 5, 2 images if 10, 3 if 15... like that, what's wrong in my switch statement? any appropriate answer is appreciable.
  2 个评论
Vishal Rane
Vishal Rane 2013-3-28
Can't say anything based on the code you have given. Can you share the code where "n" is actually used ?
Chethan
Chethan 2013-3-28
well sorry for that, above code is written in popup menu callback function.. where i actually use this 'n' is
function Search_Callback(hObject, eventdata, handles)
% hObject handle to Search (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
n = handles.n;
isTexture = get(handles.Texturecheck,'Value');
isColour = get(handles.colourcheck,'Value');
if and(isTexture, isColour)
% Colour search...
% Open database txt file... for reading...
fid = fopen('database.txt');
resultValues = []; % Results matrix...
resultNames = {};
i = 1; % Indices...
j = 1;
while 1
imagename = fgetl(fid);
if ~ischar(imagename), break, end
[X, RGBmap] = imread(imagename);
HSVmap = rgb2hsv(RGBmap);
D = quadratic(handles.queryx, handles.querymap, X,HSVmap);
resultValues(i) = D;
resultNames(j) = {imagename};
i = i + 1;
j = j + 1;
end
fclose(fid);
% Sorting colour results...
[sortedValues, index] = sort(resultValues);
fid = fopen('colourResults.txt', 'w+');
*for i = 1:n % Store top n matches...*
tempstr = char(resultNames(index(i)));
fprintf(fid, '%s\r', tempstr);
disp(resultNames(index(i)));
disp(sortedValues(i));
disp(' ')
end
I'm suppose to get 5 images at output if user selects 5 in pop-up menu, 10 images if 10 is selected and so on.... But I'm getting only 1 image if i select 5, 2 images if 10, 3 if 15... like that

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回答（1 个）

Jing
Jing 2013-3-28
It looks like you're using the selected index(the value you get is index...) of the popup menu, not the selected content for getting the output. When you use switch, it should be like this:
switch val
case 1
n=5;
case 2
n=10;
case 3
n=15;
case 4
n=20;
end
handles.n = n; %supposed handles.n is what you use to get output images.
  1 个评论
Chethan
Chethan 2013-4-2
Well, I'm getting error like Reference to non-existent field 'n'.
To over come this i added handles.n=val;
in opening function, even though I'm not getting exact result.

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