Build powerful and efficient desktop applications with Golang

Building desktop applications with Go: Use the syscall/js package to create the user interface, including input elements and event listeners. Extract user input and convert it into numbers. Performs the specified operation (addition, subtraction, multiplication, or division). Use the syscall/js package to display the results to the user and add them to the DOM. Build the application and create binaries.

Build powerful and efficient desktop applications with Go

Introduction

Go is a general-purpose programming language known for its performance, Known for its concurrency support and powerful standard library. It is ideal for building desktop applications that require high throughput. This article will guide you through building a powerful and efficient desktop application using Go.

Practical Case: Calculator Application

As a practical case, we will build a simple calculator application. This app will allow the user to enter two numbers and select an operator (addition, subtraction, multiplication or division) to calculate the result.

Create Go project

Create a new Go project directory and import the necessary packages:

package main

import (
    "fmt"
    "os"
    "strconv"
)

func main() {
    // ...
}

Build the user interface

We will use the native Go language The syscall provided in the package builds the user interface of our application. This allows us to interact directly with the operating system's window system.

import (
    "syscall/js"
)

// 创建一个 HTML 输入元素
input := js.Global().Get("document").Call("createElement", "input")
input.Set("type", "number")
input.Set("id", "num1")

// 为输入元素添加事件监听器
input.Call("addEventListener", "input", js.FuncOf(func(js.Value, []js.Value) interface{} {
    // ...
    return nil
}))

Handling user input

Use the syscall/js package to easily handle user input.

// 获取输入元素
num1 := js.Global().Get("document").Call("getElementById", "num1").Get("value")

// 将输入转换为数字
num1f, err := strconv.ParseFloat(num1.String(), 64)
if err != nil {
    // 如果转换失败，则显示错误信息
    // ...
}

Perform the calculation

The calculation result is very simple.

switch op {
case "+":
    result = num1f + num2f
case "-":
    result = num1f - num2f
case "*":
    result = num1f * num2f
case "/":
    result = num1f / num2f
}

Display results

We use the syscall/js package to display the results to the user.

// 创建一个 HTML 元素来显示结果
resultElem := js.Global().Get("document").Call("createElement", "p")
resultElem.Set("innerText", fmt.Sprintf("结果：%.2f", result))

// 将结果元素添加到 DOM 中
js.Global().Get("document").Get("body").Call("appendChild", resultElem)

Build the application

After you have built the application following the above steps, you can use the go build command to build it into a binary file.

Conclusion

This tutorial demonstrates how to build a powerful and efficient desktop application using Go. By combining Go's performance, concurrency support, and the syscall/js package, you can create a responsive, low-resource application.

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