S60 3rd Edition Device and Heap limitation!

[khurshed79]

Hi,

I have developed a downloading application for S60 3rd edtion devices. I noticed a very strange thing. I was testing of downloading a music file about 2 MB. In my downloadin application, It receives a partial chunks and expands dynamic heap memory and stores the downloading parts. However downloading hangs after downloading 800 KB. I could not allocate more space than 800 KB. I don't know how this is possible. This same application works in all other S60 devices.

I am just wondering, is there a default limitation of heap memory in S60 3rd edition devices. Should the dynamic heap be definded in the MMP file or so. Rightnow, my downloading application does not work because of this kind of limitation.

It would be very appreciable if someone knows what is going on with S60 3rd edition devices.

[iulian_moldovan]

with the default settings you cannot alloc more than one megabyte in 3rd edition

Use this in your E32Main before EikStart::RunApplication call:

RHeap *heap = UserHeap::ChunkHeap(0, 0x100000, 0x1400000); //use your values here
User::SwitchHeap(heap);

[khurshed79]

Hi iulian,

Thanks a lot, it works perfectly.

I have not found in the SDK doc about ChunkHeap method which takes 3 parameter. There are 2 variations of ChunkHeap method in UserHeap. One takes 6 parameters and other takes 7 parameters.

RHeap *heap = UserHeap::ChunkHeap(0, 0x100000, 0x1400000);

One thing, could you explain what are these 3 parameters. 0x100000, is it in KB or MB? The same for 0x1400000, KB or MB or just bytes.

[iulian_moldovan]

Hi iulian,

Thanks a lot, it works perfectly.

I have not found in the SDK doc about ChunkHeap method which takes 3 parameter. There are 2 variations of ChunkHeap method in UserHeap. One takes 6 parameters and other takes 7 parameters.

RHeap *heap = UserHeap::ChunkHeap(0, 0x100000, 0x1400000);

One thing, could you explain what are these 3 parameters. 0x100000, is it in KB or MB? The same for 0x1400000, KB or MB or just bytes.

Those two values, 0x100000 and 0x1400000 are minLength and maxLength of the chunk in bytes. So in my example I created a chunk with minimum 1MB and maximum 20MB.

[khurshed79]

Hi iulian,

Thanks.

Confused from your answer.

0x100000 and 0x1400000 in bytes ---> 1MB and maximum 20MB (How???)

If those values are in bytes:

100000/1024=97.65625 KB
1400000/1024=1367.1875 KB
1367.1875/1024=1.33 MB

How do you get 1MB and 20MB?

Could you please explain it in details.

Thanks in advance.

[iulian_moldovan]

Sorry, I forgot to tell you.... thoxe 0x.... values are in hexa

[khurshed79]

Hi iulian,

Thanks for everything. It was very quick solution to my problem.