Count up instead of down?

Hello All! I have this snippet ofcode:

   r=get(mp.currentMedia,'duration');
          remaint=r-currpos1;    
          set(handles.edit2,'String',remaint);

Basically, it gets the "duration" of the currently selected video in a GUIDE GUI in seconds, then -1 it by 1 and sends the value to an edittext.

Problem is it counts down 40, 39, 38... instead of up. I'm trying to figure out a way to modify this code so it counts from 0 to "duration"

Thanks!

Answer 1

[Oleg Komarov]

If remaint counts as 40, 39, 38... then simply currpos1 will count 0, 1, 2...

[B_Richardson]

so lose the "r-" ? I'm gonna try that now

[Oleg Komarov]

Might not work but then I need to know what are the values of r and currpos1 at the beginnign of the iteration.

[B_Richardson]

Hmmm, that did quite work. Maybe I should share more of the code:

currpos=mp.controls.currentPosition; %this probably doesnt matter

pause(1);

r=get(mp.currentMedia,'duration'); %this r is important

set(handles.slider3,'max',r) %uses r

for i=currpos:r

j=get(handles.edit1,'String');

set(mp.settings,'playCount',str2double(j));

currpos1=mp.controls.currentPosition;

index_selected1 = get(handles.listbox1,'Value');

pause(1);

r=get(mp.currentMedia,'duration');

remaint=currpos1;

set(handles.edit2,'String',remaint);

j=0;

if remaint <=0 || j==r

break;

end

end

I'll admit this is not my code but I'm sure this is where I need to make changes

[B_Richardson]

So the key party is:

r=get(mp.currentMedia,'duration');

remaint=currpos1; %this used to be remaint=r-currpos1; But I changed it

%but it still counts down

set(handles.edit2,'String',remaint);

I know that "r" has the length of the video

[B_Richardson]

Oooops I meant "didnt* quite work" at the top

[Oleg Komarov]

Are you sure you want to count it down? if remaint <= 0 will be verified immediately and will get out of the loop.

anyways: remaint = i-currpos;

[B_Richardson]

"Are you sure you want to count it down?" No I want to count up. 0,1,2,3...

I will try this out!

[Oleg Komarov]

Ehm...I wanted to ask if "are you sure you want to count it up since ..."

[B_Richardson]

I made the change, it still seems to count down.

Answer 2

[Image Analyst]

I don't know what this means "...then -1 it by 1 ..." If r is the total time of the video, and currpos1 is the elapsed time, then remaint is the remaining time, and of course that will count down as you observed. The longer it plays, the less time there is left. If you want it to show elapsed time instead of remaining time, just send currpos1 to the static text label instead of remaint. The elasped time will, of course, count up.

[B_Richardson]

set(handles.edit2,'String',currpos1);

Still the edittext counts down. There must be something else going on here.

[B_Richardson]

"...then -1 it by 1 ..."

I meant subtract by 1.

r=get(mp.currentMedia,'duration');

remaint=r-currpos1;

set(handles.edit2,'String',remaint);

I dont see why what you suggested wouldnt work. Cleary the edittext's value is remaint

Answer 3

[B_Richardson]

If you want to see the code yourself, I got it here

http://www.mathworks.com/matlabcentral/fileexchange/4441-activex-control-for-windows-media-player

Its in the callback for pushbutton2

Answer 4

[B_Richardson]

Actually everyone, I learned that the edit2 was being updated at another place in the code. After I changed that to

set(handles.edit2,'String',currpos1);

The counter starts at the beginning, but doesn't count at all. I'm sure if I had a better handle on the Matlab debugger I could figure this out

Answer 5

[B_Richardson]

Figured it out! Image Analyst was right!

remaint=currpos1;

set(handles.edit2,'String',remaint);

j=0;

if remaint <=0 j==r %had to change "remaint" to "currpos1" here

Thanks for the help. I think I'm finally starting to get good with Matlab.