table Word {
frequency:long;
ipa:string;
translation:[string];
}
table Dictionary {
keys:[string];
values:[Word];
}
root_type Dictionary;
{
"keys": ["downbeat"],
"values": [
{
"frequency": 236548,
"translation": [
"n. 下拍(乐队指挥向下的手势)；停滞",
"adj. 忧郁的；悲观的；不强烈的"
],
"ipa": "daʊnˈbit"
}
]
}cd flatbuffers/samples && ../Debug/flatc --js dictionary.fbs --binary dictionary.json
// automatically generated by the FlatBuffers compiler, do not modify
/**
* @constructor
*/
function Word() {
/**
* @type {flatbuffers.ByteBuffer}
*/
this.bb = null;
/**
* @type {number}
*/
this.bb_pos = 0;
}
/**
* @param {number} i
* @param {flatbuffers.ByteBuffer} bb
* @returns {Word}
*/
Word.prototype.__init = function(i, bb) {
this.bb_pos = i;
this.bb = bb;
return this;
};
/**
* @param {flatbuffers.ByteBuffer} bb
* @param {Word=} obj
* @returns {Word}
*/
Word.getRootAsWord = function(bb, obj) {
return (obj || new Word).__init(bb.readInt32(bb.position()) + bb.position(), bb);
};
/**
* @returns {flatbuffers.Long}
*/
Word.prototype.frequency = function() {
var offset = this.bb.__offset(this.bb_pos, 4);
return offset ? this.bb.readInt64(this.bb_pos + offset) : this.bb.createLong(0, 0);
};
/**
* @param {flatbuffers.Encoding=} optionalEncoding
* @returns {string|Uint8Array|null}
*/
Word.prototype.ipa = function(optionalEncoding) {
var offset = this.bb.__offset(this.bb_pos, 6);
return offset ? this.bb.__string(this.bb_pos + offset, optionalEncoding) : null;
};
/**
* @param {number} index
* @param {flatbuffers.Encoding=} optionalEncoding
* @returns {string|Uint8Array}
*/
Word.prototype.translation = function(index, optionalEncoding) {
var offset = this.bb.__offset(this.bb_pos, 8);
return offset ? this.bb.__string(this.bb.__vector(this.bb_pos + offset) + index * 4, optionalEncoding) : null;
};
/**
* @returns {number}
*/
Word.prototype.translationLength = function() {
var offset = this.bb.__offset(this.bb_pos, 8);
return offset ? this.bb.__vector_len(this.bb_pos + offset) : 0;
};
/**
* @param {flatbuffers.Builder} builder
*/
Word.startWord = function(builder) {
builder.startObject(3);
};
/**
* @param {flatbuffers.Builder} builder
* @param {flatbuffers.Long} frequency
*/
Word.addFrequency = function(builder, frequency) {
builder.addFieldInt64(0, frequency, builder.createLong(0, 0));
};
/**
* @param {flatbuffers.Builder} builder
* @param {flatbuffers.Offset} ipaOffset
*/
Word.addIpa = function(builder, ipaOffset) {
builder.addFieldOffset(1, ipaOffset, 0);
};
/**
* @param {flatbuffers.Builder} builder
* @param {flatbuffers.Offset} translationOffset
*/
Word.addTranslation = function(builder, translationOffset) {
builder.addFieldOffset(2, translationOffset, 0);
};
/**
* @param {flatbuffers.Builder} builder
* @param {Array.<flatbuffers.Offset>} data
* @returns {flatbuffers.Offset}
*/
Word.createTranslationVector = function(builder, data) {
builder.startVector(4, data.length, 4);
for (var i = data.length - 1; i >= 0; i--) {
builder.addOffset(data[i]);
}
return builder.endVector();
};
/**
* @param {flatbuffers.Builder} builder
* @param {number} numElems
*/
Word.startTranslationVector = function(builder, numElems) {
builder.startVector(4, numElems, 4);
};
/**
* @param {flatbuffers.Builder} builder
* @returns {flatbuffers.Offset}
*/
Word.endWord = function(builder) {
var offset = builder.endObject();
return offset;
};
/**
* @constructor
*/
function Dictionary() {
/**
* @type {flatbuffers.ByteBuffer}
*/
this.bb = null;
/**
* @type {number}
*/
this.bb_pos = 0;
}
/**
* @param {number} i
* @param {flatbuffers.ByteBuffer} bb
* @returns {Dictionary}
*/
Dictionary.prototype.__init = function(i, bb) {
this.bb_pos = i;
this.bb = bb;
return this;
};
/**
* @param {flatbuffers.ByteBuffer} bb
* @param {Dictionary=} obj
* @returns {Dictionary}
*/
Dictionary.getRootAsDictionary = function(bb, obj) {
return (obj || new Dictionary).__init(bb.readInt32(bb.position()) + bb.position(), bb);
};
/**
* @param {number} index
* @param {flatbuffers.Encoding=} optionalEncoding
* @returns {string|Uint8Array}
*/
Dictionary.prototype.keys = function(index, optionalEncoding) {
var offset = this.bb.__offset(this.bb_pos, 4);
return offset ? this.bb.__string(this.bb.__vector(this.bb_pos + offset) + index * 4, optionalEncoding) : null;
};
/**
* @returns {number}
*/
Dictionary.prototype.keysLength = function() {
var offset = this.bb.__offset(this.bb_pos, 4);
return offset ? this.bb.__vector_len(this.bb_pos + offset) : 0;
};
/**
* @param {number} index
* @param {Word=} obj
* @returns {Word}
*/
Dictionary.prototype.values = function(index, obj) {
var offset = this.bb.__offset(this.bb_pos, 6);
return offset ? (obj || new Word).__init(this.bb.__indirect(this.bb.__vector(this.bb_pos + offset) + index * 4), this.bb) : null;
};
/**
* @returns {number}
*/
Dictionary.prototype.valuesLength = function() {
var offset = this.bb.__offset(this.bb_pos, 6);
return offset ? this.bb.__vector_len(this.bb_pos + offset) : 0;
};
/**
* @param {flatbuffers.Builder} builder
*/
Dictionary.startDictionary = function(builder) {
builder.startObject(2);
};
/**
* @param {flatbuffers.Builder} builder
* @param {flatbuffers.Offset} keysOffset
*/
Dictionary.addKeys = function(builder, keysOffset) {
builder.addFieldOffset(0, keysOffset, 0);
};
/**
* @param {flatbuffers.Builder} builder
* @param {Array.<flatbuffers.Offset>} data
* @returns {flatbuffers.Offset}
*/
Dictionary.createKeysVector = function(builder, data) {
builder.startVector(4, data.length, 4);
for (var i = data.length - 1; i >= 0; i--) {
builder.addOffset(data[i]);
}
return builder.endVector();
};
/**
* @param {flatbuffers.Builder} builder
* @param {number} numElems
*/
Dictionary.startKeysVector = function(builder, numElems) {
builder.startVector(4, numElems, 4);
};
/**
* @param {flatbuffers.Builder} builder
* @param {flatbuffers.Offset} valuesOffset
*/
Dictionary.addValues = function(builder, valuesOffset) {
builder.addFieldOffset(1, valuesOffset, 0);
};
/**
* @param {flatbuffers.Builder} builder
* @param {Array.<flatbuffers.Offset>} data
* @returns {flatbuffers.Offset}
*/
Dictionary.createValuesVector = function(builder, data) {
builder.startVector(4, data.length, 4);
for (var i = data.length - 1; i >= 0; i--) {
builder.addOffset(data[i]);
}
return builder.endVector();
};
/**
* @param {flatbuffers.Builder} builder
* @param {number} numElems
*/
Dictionary.startValuesVector = function(builder, numElems) {
builder.startVector(4, numElems, 4);
};
/**
* @param {flatbuffers.Builder} builder
* @returns {flatbuffers.Offset}
*/
Dictionary.endDictionary = function(builder) {
var offset = builder.endObject();
return offset;
};
/**
* @param {flatbuffers.Builder} builder
* @param {flatbuffers.Offset} offset
*/
Dictionary.finishDictionaryBuffer = function(builder, offset) {
builder.finish(offset);
};
// Exports for Node.js and RequireJS
this.Word = Word;
this.Dictionary = Dictionary;
var assert = require("assert");
var flatbuffers = require("../js/flatbuffers").flatbuffers;
var { Dictionary, Word } = require("./dictionary_generated.js");
var fs = require("fs");
function main() {
var data = new Uint8Array(fs.readFileSync("./dictionary.bin"));
var buf = new flatbuffers.ByteBuffer(data);
var dict = Dictionary.getRootAsDictionary(buf);
console.log("dict.keysLength", dict.keysLength());
var word = dict.values(0);
console.log(
"word",
word.ipa(),
word.translationLength(),
word.translation(0),
word.translation(1)
);
console.log("dict.valuesLength", dict.valuesLength());
console.log("The FlatBuffer was successfully created and verified!");
}
main();
flatc -b myschema.fbs mydata.json
This will generate the binary file mydata_wire.bin which can be loaded as before.
https://github.com/google/flatbuffers/blob/master/docs/source/CppUsage.md
some inspiration: google/flatbuffers#4289