error writing in matlab 7.11 ( r2010b)

when i try this code imaqreset clear all

vid = videoinput('winvideo', 1'); % inisialisasi hardware
vid.FramesPerTrigger = 5;
vid.TriggerRepeat = inf;
triggerconfig(vid, 'manual');
vid.TimerFcn = 'trigger(vid)';
vid.TimerPeriod = 0.5;

for ctr = 1:3
Img = getsnapshot(vid); 
fname = ['Image' num2str(ctr)]; 
%mkdir('coding')
imwrite(Img,fname, 'JPG');
end

the error message show in command window

??? Error using ==> imwrite at 453
Can't open file "Image1" for writing.
You may not have write permission.

Error in ==> kamerasukses at 15
imwrite(Img,fname, 'JPG');

but when i use the matlab 7 i can run this program is there any solution ?

i already try to use mkdir to create a directory

the same problem like here http://www.mathworks.com/support/solutions/en/data/1-APY5VN/?solution=1-APY5VN

Answer 1

[Jan]

What is the current directory when the program runs? Which directory did you try to create using MKDIR and has it been successful?

Please try:

disp(cd)
fileattrib(cd)
% To my surprice "UserWrite: 0" does *not* mean, that
% I cannot create a file in the directory?!
imwrite(rand(100, 100, 3), 'test.jpg', 'jpg');

[Succ, Msg] = mkdir('coding');
if Succ ~= 1, error(Msg); end
imwrite(rand(100, 100, 3), ...
        fullfile(cd, 'coding', 'test.jpg'), 'jpg');

[danny agus]

sorry for the late reply

i have try the code above

but still error

have any solution ?

the error message is

??? Error using ==> imwrite at 453

Can't open file "test.jpg" for writing.

You may not have write permission.

Error in ==> Untitled at 5

imwrite(rand(100, 100, 3), 'test.jpg', 'jpg');

Answer 2

[Beth]

Are you using Windows 7 by chance? You may be running into conflict with the Windows 7 Index function. Fairly detailed instructions for turning it off are here.

[jinan eng]

i have problem Error using ==> imwrite at 457 Can't open file "onion.png" for writing. You may not have write permission.

[Jan]

Please, jinan eng, open a new thread for a new question. Thanks.