Swift：在 Win10 上编程入门_swift windows

访问 https://swift.org/download/
找到 Windows 10：x86_64
下载 swift-5.10-RELEASE-windows10.exe  大约490MB
建议安装在 D:\Swift\ ，安装后大约占2.56GB

官网文档：https://www.swift.org/documentation/

中文教程：The swift programming language 中文版

运行  cmd

swiftc -v
Swift version 5.10 (swift-5.10-RELEASE)
Target: x86_64-unknown-windows-msvc

cd D:\Swift\

mkdir test ; cd  test

用 Notepad++ 编写  hello.swift  如下

let a = 2
let b = 3
print("a+b=", a+b)

SET SDKROOT=D:\Swift\Platforms\5.10.0\Windows.platform\Developer\SDKs\Windows.sdk

可以在环境变量中设置，编译执行  swiftc hello.swift -o hello.exe -sdk %SDKROOT%

运行  hello.exe

编写  fibonacci.swift  如下

import Foundation
 
var i:Int = 0
if CommandLine.arguments.count > 1 {
    let str = CommandLine.arguments[1]
    let number = NumberFormatter().number(from: str)
    i = number!.intValue
} else {
    print(" usage: fibonacci.exe n ")
    exit(0)
}
// 计算 斐波那契数列（Fibonacci sequence）
func fib(n: Int) -> Decimal {
    if n <= 0 { return 0 }   
    var x: Decimal = 0, y: Decimal = 1
    for _ in 1..<n {
        (x, y) = (y, y + x)
    }
    return y
}
// 调用示例
print("fib(\(i))=", fib(n:i))

编写 compile.bat  如下

@echo off
SET SDKROOT=D:\Swift\Platforms\5.10.0\Windows.platform\Developer\SDKs\Windows.sdk
swiftc %1.swift -o %1.exe -sdk %SDKROOT%

编译执行  compile.bat  fibonacci

运行 fibonacci.exe 200

fib(200)= 280571172992510140037611932413038677186000  这个结果溢出了。

下一篇 python fibonacci.py 200

fib(200)= 280571172992510140037611932413038677189525 这个结果是对的。

从 https://github.com/ericsink/SwiftWinRT  下载 SwiftWinRT-main.zip

cd D:\Swift\test\SwiftWinRT-main\WinRT
swift build

Microsoft.WindowsAppRuntime.Bootstrap.lib 在 D:\Swift\test\SwiftWinRT-main\Samples\ 中

从 GitHub - thebrowsercompany/swift-winui: Swift language bindings for WinUI3

下载  swift-winui-main.zip  请看 README.md ; 

从 Windows商店下载 WinUI 3 Gallery

将 Swift软件包构建为通用二进制文件：

cd D:\Swift\test\SwiftWinRT-main\Samples\HttpClient

编辑  SwiftWinRT-main\Samples\HttpClient\Sources\HttpClient\main.swift  如下

import WinRT
 
@main
class HttpClientDemo {
  public static func main() async throws {
    var str: String
    if CommandLine.arguments.count > 1 {
        str = CommandLine.arguments[1]
    } else {
        print(" usage: HttpClient.exe url ")
        exit(0)
    }
    try RoInitialize()
 
    let httpClient = try Windows.Web.Http.HttpClient();
    let requestUri = try Windows.Foundation.Uri(uri: str);
    let httpResponse = try await httpClient.Get(uri: requestUri)!;
    let _ = try httpResponse.EnsureSuccessStatusCode();
    let httpResponseBody = try await httpResponse.Content!.ReadAsString();
    print(httpResponseBody);
  }
}

swift build -c debug  --arch x86_64
或 swift build -c release --arch x86_64

swift run --help
swift run HttpClient http://www.baidu.com

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