Web and WebWorks Development

[asiayeah]

On a playbook, I am trying to use the blackberry.io.file API to open a local file. From the blob, what is the correct way to read the binary file byte by byte?

I know there is the blogToString API, but does it work with binary file?

Thanks!

[jeffheifetz]

Hi asiayeah,

The Blob interface has a "getBytes" method, but I've never used it.

I have documented the missing Blob documentation here

[asiayeah]

Thanks, jeffheifetz.

I have clicked on the link you posted, but I only find the issue with no documentation. Do you mean you are going to create one?

I have looked at https://github.com/blackberry/WebWorks-TabletOS/blob/master/js_api/globalJS/5_blob.js, but I can't see the "getBytes" method there though. Any idea why?

Thank you.

[cuixu66]

Hello Jeff,

I think I need to use the "getBytes" method on blob on PLAYBOOK.(If it exists).

The "blob documentation" link has no useful information right now.

Could you please give me a new link with blob interface available on playbook webworks?

Thanks!

[jeffheifetz]

As I stated earlier, the getBytes method is not currently in our documentation, the link is to an issue to track this so that it will be fixed at some point.

Here is a link to the gears Blob which I believe should match the implementation on the smartphone (atleast in 5.0). I do not know if this method is implemented on the playbook, best way is try and see.

[cuixu66]

Thank Jeff,

Also,

For those interested to know:
The blob.getBytes is not implemented on playbook.

[asiayeah]

Actually the blob.getBytes is available on both PlayBook and BlackBerry smartphone platform. I am able to use it in my PlayBook app.

[ignites]

Not sure if this is what you want but you can also put your blob in a string then read it through 1 index at a time
ie.
var strName = blob;
strName[i] would read the i-th character.

[asiayeah]

Have RIM updated the missing documentation for the Blob yet?

I've been using the Blob.getBytes(). However, I found that it is leaking memory each time, getBytes() is called, even after releasing the returned byte[]. Is it a known issue? Is there any other workaround?

I'm testing on PlayBook 2.0.1.

Thanks.