Writing Int32 to ByteBuffer yields strange result in DataView

[tfalencar]

Writing Int32 to ByteBuffer yields strange result in DataView

[dcodeIO]

Make sure to call flip() once all relative write operations are complete. See: https://github.com/dcodeIO/ByteBuffer.js/wiki/Offset-and-limit

var bb = new ByteBuffer().LE();
for (...) {
  // bb.append(new ByteBuffer().LE().writeInt32(data.calculate()).flip());
  bb.writeInt32(data.calculate());
}
var ab = bb.flip().toArrayBuffer();
...

[tfalencar]

HOORAY! it works now! I actually tried the short version as well before, but it didn't come to me that when using .toArrayBuffer() that is effectively performing a read operation, and per docs if I understood it right when switching from read/write operations a flip() is necessary, so that explains it (I forgot to add it when creating the DataView() after using .toArrayBuffer().

Just for clarity writing both mentioned ways works now:

byteBuffer.writeInt32(data.calculate());
//or
byteBuffer.append(new ByteBuffer(ByteBuffer.DEFAULT_CAPACITY, ByteBuffer.LITTLE_ENDIAN).writeInt32(data.calculate()).flip());

//the important, forgotten flip() - 'implicit' read operation:
new Blob([new DataView(byteBuffer.flip().toArrayBuffer())]

Thanks a lot !