SwiftEccodes

一个非常基础的库，用于使用 Swift 读取 GRIB 文件。此库是 eccodes 的封装库。

用法

通过 brew install eccodes 或 apt install libeccodes-dev 安装 eccodes

将 SwiftEccodes 作为依赖项添加到你的 Package.swift

  dependencies: [
    .package(url: "https://github.com/patrick-zippenfenig/SwiftEccodes.git", from: "0.0.0")
  ],
  targets: [
    .target(name: "MyApp", dependencies: [
      .product(name: "SwiftEccodes", package: "SwiftEccodes"),
    ])
  ]

从文件中读取 GRIB 消息和数据

import SwiftEccodes

let messages = try SwiftEccodes.getMessages(fileName: "test.grib", multiSupport: true)
for message in messages {
    message.iterate(namespace: .ls).forEach({
        print($0)
    })
    print(message.get(attribute: "name")!)
    let data = try message.getDouble()
    print(data[0..<10])
}

或者直接从内存中读取

import SwiftEccodes

let data = try Data(contentsOf: URL(fileURLWithPath: "test.grib"))
try data.withUnsafeBytes { ptr in
    let messages = try SwiftEccodes.getMessages(memory: ptr, multiSupport: true)
    for message in messages {
        message.iterate(namespace: .ls).forEach({
            print($0)
        })
        message.iterate(namespace: .geography).forEach({
            print($0)
        })
        print(message.get(attribute: "name")!)
        let data = try message.getDouble()
        print(data.count)
        print(data[0..<10])
    }
}