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Example
Zade Viggers edited this page May 23, 2024
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4 revisions
Note
This page has been updated for jDataView 3
First, we need a buffer, like so
// jDataView.from(...args) is a helper method that constructs a new jDataView instance
// with the provided spread arguments. It only works in little-endian.
let view = jDataView.from(
0x00, 0x00, 0x01, 0x10, // Int32 - 272
0x47, 0x1b, 0xcf, 0x90, // Float32 - 39887.5625
0, 0, 0, 0, 0, 0, 0, 0, // 8 blank bytes
0x4d, 0x44, 0x32, 0x30, // String - MD20
0x61 // Char - a
);Now, we use the DataView as defined in the specification. The only change is the "j" in front of "DataView."
let version = view.getInt32(0); // 272
let float = view.getFloat32(4); // 39887.5625The wrapper extends the specification to make the DataView easier to use.
// Create a new jDataView instance on the same buffer
view = view.slice(0);
// A position counter is managed. Remove the argument to read right after the last read.
version = view.getInt32(); // 272
float = view.getFloat32(); // 39887.5625
// You can move around with tell(), seek() and skip()
view.skip(8);
// Helpers like getChar and getString will make your life easier
const tag = view.getString(4); // MD20
const char = view.getChar(); // a