How to build a single-page web application using C++?-C++-php.cn

How to build a single-page web application using C++?

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Release： 2024-06-01 16:08:02

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Building SPA using C++ involves: 1. Installing Emscripten and configuring the compiler; 2. Running the build script to compile the code; 3. Creating an HTML interface containing the WASM module; 4. Deploying the SPA to the web server.

How to build a single-page web application using C++?

Building a single-page web application using C++

A single-page web application (SPA) is a dynamic and interactive A web application that renders content on the client side after loading a single HTML page. C++ is primarily used for creating backend applications, but it can also run in a web browser via WebAssembly (WASM).

Steps

Install Emscripten: Emscripten is a compiler toolchain that compiles C++ code to WASM. Install Emscripten and set environment variables.
Configure the build system: Use CMake or other build systems to create build scripts. Set Emscripten compiler as target.
Run the build: Run the build script to compile the C++ code into WASM and HTML files.
Create HTML file: The HTML file should load the WASM module and provide the interface. For example:

<!DOCTYPE html>
<html>
<body>
  <div id="output"></div>
  <script>
    // 加载WASM模块
    let instance = null;
    (async () => {
      instance = await WebAssembly.instantiateStreaming(fetch('app.wasm'));
    })();
  
    // 调用WASM函数
    const result = instance.exports.computeFibonacci(10);
  
    // 将结果显示在界面上
    document.getElementById('output').innerHTML = result;
  </script>
</body>
</html>

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Deploy SPA: Deploy the HTML file and WASM module to the web server.

Practical case

Consider a SPA that calculates the Fibonacci sequence. The following C++ code can be used:

// 计算斐波那契数列
long long int fib(int n) {
  if (n <= 1) {
    return n;
  } else {
    return fib(n - 1) + fib(n - 2);
  }
}

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Compile this code via Emscripten and create a SPA using the above HTML file. When this SPA is loaded, the user can enter a number and the SPA will calculate and display the corresponding Fibonacci number using the WASM function.

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