Quanyu,
I would say:
1. Again, use BufferedInputStream
2. Use your own buffer, i.e., a char[1024] or something equally large, and read
the file in chunks.
-Mario.
Quanyu Zhu wrote:
> Hi,there:
> Thanks for the comments !
> I think I need to specify more detail about my mission.
> I just worked on file which contain the image info, I need to get the
> info from the huge file. The file format like:
> Structure Table 1;
> Structure Table 2;
> pixel 1:
> {
> Loop 1:
> data Structure 1
> data Structure 2
> ...
> until data struture.member1 == 0;
> }
> pixel 2:
> {
> Loop 1:
> data Structure 1
> data Structure 2
> ...
> until data struture.member1 == 0;
> }
> ...
> What I need is to get the info for the pixel to draw the image.
> Although the pixel is huge, but within each pixel, I need to add the
> data structure member2 to get the value of pixel.
> At first, I just read the pixel by pixel, that is a very small file
> which just contain 11M. For this method, it seems worked very slow.
> Then I used one byte array allocate the size of the file. Then used
> the byte array to convert it to int using shift.
> It improved the performance a lot.
> But the real data file I will deal with is more than 11M. It is more
> than 500M.
> That is my problem.
> So anyone have such idea ?
>
> Best Regard
> Quanyu Zhu
>
>
>
> ______________________________________________________
> Get Your Private, Free Email at http://www.hotmail.com
