How to read 200 bytes of a file albums

I have to read bytes n top of page of a set of very large files in the system in my WebWorks app, but I do not know how to implement it. Please help me.

Thank you

Hi huydq5000,

Using the FileReader, you can use the function called readAsBinaryString (blob)

Suppose you had a file named file object and a FileReader object named reader.

You can use file.slice (startByte, endByte) to get a piece of your object file Blob, in your case it would be something like:

reader.readAsBinaryString (file.slice (0, n));

Take a look at the section 'Cut a file' in this link:
http://www.html5rocks.com/en/tutorials/file/dndfiles/

Tags: BlackBerry Developers

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