Count up instead of down?

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B_Richardson
B_Richardson 2011-8-4
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!

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采纳的回答

Oleg Komarov
Oleg Komarov 2011-8-4
If remaint counts as 40, 39, 38... then simply currpos1 will count 0, 1, 2...
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Oleg Komarov
Oleg Komarov 2011-8-4
Ehm...I wanted to ask if "are you sure you want to count it up since ..."
B_Richardson
B_Richardson 2011-8-4
I made the change, it still seems to count down.

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更多回答（4 个）

Image Analyst
Image Analyst 2011-8-4
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.
  2 个评论
B_Richardson
B_Richardson 2011-8-4
set(handles.edit2,'String',currpos1);
Still the edittext counts down. There must be something else going on here.
B_Richardson
B_Richardson 2011-8-4
"...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

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B_Richardson
B_Richardson 2011-8-4
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
B_Richardson
B_Richardson 2011-8-4
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
B_Richardson
B_Richardson 2011-8-4
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.

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