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Kotlin Native调用C curl

news 2025/8/7 10:11:40

官方中文文档

https://kotlin.liying-cn.net/native-app-with-c-and-libcurl.html

实验环境：macOS - IDEA

一、安装 libcurl

brew install curl

配置环境变量：

echo 'export LDFLAGS="-L/usr/local/opt/curl/lib"' >> ~/.zshrc
echo 'export CPPFLAGS="-I/usr/local/opt/curl/include"' >> ~/.zshrc

使配置生效：

source ~/.zshrc

二、克隆仓库

git clone https://github.com/Kotlin/kmp-native-wizard

三、新建 libcurl.def 文件

1. 在 src 文件夹下，选择 File | New | Directory 创建新目录。

2. 将新目录命名为 nativeInterop/cinterop，这是 libcurl 头文件的默认位置。如果你选择了不同的位置，也可以在 build.gradle.kts 文件中做相应修改。

3. 进入新建的子文件夹，使用 File | New | File 创建一个名为 libcurl.def 的文件，并将其内容更新为以下代码：

headers = curl/curl.h
headerFilter = curl/*compilerOpts.linux = -I/usr/include -I/usr/include/x86_64-linux-gnu
linkerOpts.osx = -L/opt/local/lib -L/usr/local/opt/curl/lib -lcurl
linkerOpts.linux = -L/usr/lib/x86_64-linux-gnu -lcurl

四、修改 build.gradle.kts 文件

plugins {alias(libs.plugins.kotlinMultiplatform)alias(libs.plugins.kotlinxSerialization)
}group = "me.user"
version = "1.0-SNAPSHOT"repositories {mavenCentral()
}kotlin {val hostOs = System.getProperty("os.name")val isArm64 = System.getProperty("os.arch") == "aarch64"val isMingwX64 = hostOs.startsWith("Windows")val nativeTarget = when {hostOs == "Mac OS X" && isArm64 -> macosArm64("native")hostOs == "Mac OS X" && !isArm64 -> macosX64("native")hostOs == "Linux" && isArm64 -> linuxArm64("native")hostOs == "Linux" && !isArm64 -> linuxX64("native")isMingwX64 -> mingwX64("native")else -> throw GradleException("Host OS is not supported in Kotlin/Native.")}nativeTarget.apply {compilations.getByName("main") {cinterops {val libcurl by creating {definitionFile.set(project.file("src/nativeInterop/cinterop/libcurl.def"))packageName("libcurl")compilerOpts("-I/usr/local/opt/curl/include")  // 设置头文件路径includeDirs.allHeaders("/usr/local/opt/curl/include")  // 包含头文件目录linkerOpts("-L/usr/local/opt/curl/lib")  // 设置库文件路径}}}binaries {executable {entryPoint = "main"}}}sourceSets {nativeMain.dependencies {implementation(libs.kotlinxSerializationJson)}}
}

五、用 IDEA 打开这个项目的 main.kt 修改内容为

import kotlinx.cinterop.*
import libcurl.*@OptIn(ExperimentalForeignApi::class)
fun main(args: Array) {val curl = curl_easy_init()if (curl != null) {curl_easy_setopt(curl, CURLOPT_URL, "https://www.anyuer.club")curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L)val res = curl_easy_perform(curl)if (res != CURLE_OK) {println("curl_easy_perform() failed ${curl_easy_strerror(res)?.toKString()}")}curl_easy_cleanup(curl)}
}

这段代码等价于用 C 语言编写的代码，原理是通过调用 curl 库：

#include <stdio.h>
#include <curl/curl.h>int main(void)
{CURL *curl;CURLcode res;curl = curl_easy_init();if(curl) {curl_easy_setopt(curl, CURLOPT_URL, "https://www.anyuer.club");curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L);res = curl_easy_perform(curl);if(res != CURLE_OK)fprintf(stderr, "curl_easy_perform() failed: %s\n", curl_easy_strerror(res));curl_easy_cleanup(curl);}return 0;
}