Sounds like a plan ;) -----Ursprüngliche Nachricht----- Von: Simon MacDonald [mailto:simon.macdon...@gmail.com] Gesendet: Freitag, 7. September 2012 16:50 An: callback-dev@incubator.apache.org Betreff: Re: FW: apache-cordova - FileReader#readAsTextFile throws OOM when reading local file
Well what I was thinking is that I could change the FileReader code so that the native side sends over a smaller chunk of data at a time then frees up that memory on the native side. The onloadend method of the FileReader would not be called until the read is finished. Simon Mac Donald http://hi.im/simonmacdonald On Thu, Sep 6, 2012 at 4:06 PM, Clemens Wyss - MySign AG < clemens.w...@mysign.ch> wrote: > "Chunked reading" does not really help when you need to parse json or xml. > We would require > A) streamed File I/O > B) a stream based json parser > > I guess jQuery's Ajax (getJSON) does exactly this on the HTTP response > stream. Does anybody now if I could "abuse" jQuery's ajax to parse > json from the local filesystem (not a file in the apk, but one that is > on the devices's filesystem). I tried with the file:/// URI but didn't > get hold of the file Š > > Thx > Clemens > > ----------------------------------------- > Yup, that's because the data is effectively doubled as it needs to be > passed from the native side to the Javascript side. When you are > downloading the data from the net it is just coming down to the > JavaScript side of things. > > > Hmmm...I should open an improvement for file reading to do it in chunks. > > > Simon Mac Donald > http://hi.im/simonmacdonald > On Thu, Sep 6, 2012 at 11:00 AM, Clemens Wyss <clem...@mysign.ch> wrote: > > > Simon, thx for your reply. > But why then can I download the "same amount" to my device and then > save it? Anda t the very same time the content (being json) is decoded > into RAM ... > Only when trying to load from FS I get the OOM ... > > > -----Ursprüngliche Nachricht----- > Von: Simon MacDonald [mailto:simo...@gmail.com] > Gesendet: Donnerstag, 6. September 2012 16:56 > An: call...@incubator.apache.org > Betreff: Re: apache-cordova - FileReader#readAsTextFile throws OOM > when reading local file > > > It's just too much memory for the HTC Desire to handle. Each > application has a piece of the system memory on the HTC Desire the RAM > is 384 MB while on the Samsung Galaxy S2 has 1 GB or RAM. I'm making > the assumption that the available memory for each application is much > smaller on the HTC deviceas it has one third the memory of the Samsung > and that's probably why you are getting the OOM exception. > > > Simon Mac Donald > http://hi.im/simonmacdonald > On Thu, Sep 6, 2012 at 8:21 AM, Clemens Wyss - MySign AG < > clem...@mysign.ch> wrote: > > > Hi all (me being new to this mailinglist), > > > Context: > cordova 2.0-app on my HTC Desire (Android 2.3.7) jQuery 1.7.1 > jQuery.mobile 1.1.1 > > > I try to read a json file (2.5MB) from my HTC Desire. > fileReader.readAsTextFile(...) throws an out of memory exception. > Is 2.5M "too much"? > > > Thx > Clemens > > > Note 1: > I am able to download the very file (through $.ajax) and save it > locally using FileWriter. Could it be that in "this case" the file is > being streamed and not completely read into RAM? > > > Note 2: > Having no problem on a Samsung Galaxy2 with Andorid 4.03 > >
