javascript - 在JavaScript Google Flatbuffers中，如何编写ulong？

我在C ++程序中做到这一点没有问题，但是我坚持用JS写ulong。

如果我使用32位process.hrtime（）值，FB不会有问题。

但是，如何为64位创建createLong（）？

参见：[https://nodejs.org/api/process.html#process_process_hrtime_bigint]

# commented line does not work
# let timeStamp = process.hrtime.bigint()
        let timeStamp = process.hrtime()
        let ts = builder.createLong(0, timeStamp)
        PNT.Telemetry.startTelemetry(builder)
        PNT.Telemetry.addSystemTime(builder, ts)

FB模板文件

// Simple Telemetry data from/to Sim and Sensor
namespace PNT;
enum DeviceType:byte { IMU, VAN, GPS, MAGNAV, SOOP }
struct PosVector {
  lat:double;
  lon:double;
  alt:double;
}
table Telemetry {
  source: string;
  systemTime:ulong = 0;
  systemTimeString: string;
  description: string;
  position: PosVector;
}

root_type Telemetry;

最佳答案

您可以使用此功能，它可以很好地用于时间戳记

var flatBufferTimeStamp = function(value) {
    var bin = (value).toString(2);
    var pad = new Array(64 - bin.length + 1 ).join('0');
    bin = pad + bin;
    return {
        low: parseInt(bin.substring(32), 2),
        high: parseInt(bin.substring(0, 32), 2)
    };
}


var timeStamp = flatBufferTimeStamp(process.hrtime())
let ts = builder.createLong(timeStamp.low, timeStamp.high);
PNT.Telemetry.startTelemetry(builder)
PNT.Telemetry.addSystemTime(builder, ts)

资料来源：https://groups.google.com/forum/#!topic/flatbuffers/ieXNEsB_2wc