read jpg file in a loop

[Hillman]

Hi All,

I have simple labview code which has a memory leak.

I am creating the file path to the jpg file, and then using the Read JPEG file.vi and Draw Flatten PixMap.vi to display the image.

How can I do this without leaking memory?

In the future, I will have another application which updates the file every so often. I will use some sort of control to stop reading/writing to the file at the same time.

Please help,

James 

[muks]

Can you post a screen shot to show where the mem leak is? Do you have VDM(vision development module)?

[DavidJCrawford]

Hi James

I just tried it here in 8.5.1 and a don't see memory leak.

I am going to guess that you may have the picture data in a shift register and feeding the previous iteration into Draw Flattened Pixmap picture input. Have a look inside Draw Flattened Pixmap. Its basically concatentating strings which may be your the leak you are seeing.

cheers

David

[Hillman]

Hi everyone - thanks for the replies.

My simple mock up of the issue looks like :

 

The LabVIEW.exe memory increases by 5,000k per iteration of the loop. This is concerning.

Is this to be expected?

Can it be avoided?

Should I consider another apporach?

PS I do not have the VDM.  

THANKS!

James 

Message Edited by Hillman on 03-27-2010 11:29 AM

[MikeS81 · Accepted solution]

Hi James,

i think the reason is, that you use a shift register. The "Draw Flattened Pixmap" functions adds the new image every iteration to the old one.

Mike

[Hillman]

Thanks mike! That worked  - obviously. I felt like I must have been missing using the VI.

Have a great weekend,

James  

[qz6y7q]

Thanks a lot

You recomadation working for me.

Best Regards