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网页怎么调用c语言

网页调用C语言,通常是指将C语言编写的程序嵌入到网页中,以实现特定的功能,这种方式在很多年前是非常流行的,但随着JavaScript等前端技术的发展,现在已经有了更多的选择,但在某些场景下,如嵌入式设备、服务器端渲染等,C语言仍然具有不可替代的优势,下面将详细介绍如何在网页中调用C语言。

1、CGI(Common Gateway Interface)

CGI是一种允许网页与服务器上的程序进行交互的技术,通过CGI,我们可以在网页中调用C语言编写的程序,以下是一个简单的C语言CGI程序示例:

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <cgibin/cgi_env.h>
int main(void) {
    char *query_string = getenv("QUERY_STRING");
    printf("Contenttype: text/html
");
    printf("<html><head><title>CGI Program</title></head>");
    printf("<body><p>You sent a query to the CGI program:</p>");
    printf("<pre>%s</pre></body></html>", query_string);
    exit(0);
}

将上述代码保存为cgibin/your_program.c,并确保其具有可执行权限,在网页中添加一个链接,指向http://your_website.com/cgibin/your_program,当用户点击该链接时,服务器将执行your_program.c中的代码,并将结果返回给浏览器。

2、WebAssembly

WebAssembly是一种可以在浏览器中运行的低级虚拟机代码,它支持多种编程语言,包括C语言,要使用WebAssembly,首先需要将C语言代码编译为WebAssembly模块,可以使用Emscripten工具来实现这一点,以下是一个简单的示例:

安装Emscripten:

git clone https://github.com/emscriptencore/emsdk.git
cd emsdk
./emsdk install latestupstream
source ./emsdk_env.sh

创建一个名为main.c的C语言文件,内容如下:

#include <stdio.h>
int main() {
    printf("Hello, World!");
    return 0;
}

使用Emscripten编译C语言代码为WebAssembly:

emcc main.c o main.html s WASM=1 s SINGLE_FILE=1 s NO_FILESYSTEM=1 s "EXPORTED_FUNCTIONS=['_main']" O3 closure 1 llvmlto 1 memoryinitfile 0 jstransform "node=0" noentry allowundefined baseline g4 emitllvm c o main.bc main.c && wget https://github.com/kripken/emscripten/releases/download/v1.39.1/html5shivmin.js O main.html && wget https://github.com/kripken/emscripten/releases/download/v1.39.1/webgldebug.js O main.html && wget https://github.com/kripken/emscripten/releases/download/v1.39.1/prettify.js O main.html && wget https://unpkg.com/workerpool@1.0.3/dist/workerpool.min.js O main.html && cat main.html > final_main.html && mv final_main.html main.html && wget https://unpkg.com/workerpool@1.0.3/dist/workerpool.min.js O workerpool.js && wget https://cdnjs.cloudflare.com/ajax/libs/FileSaver.js/2018.8.3/FileSaver.min.js O FileSaver.js && wget https://cdnjs.cloudflare.com/ajax/libs/pako/1.0.10/pako_deflate.min.js O pako_deflate.js && wget https://cdnjs.cloudflare.com/ajax/libs/pako/1.0.10/pako_inflate.min.js O pako_inflate.js && wget https://cdnjs.cloudflare.com/ajax/libs/cryptojs/3.1.91/cryptojs.min.js O cryptojs.min.js && wget https://cdnjs.cloudflare.com/ajax/libs/cryptojs/3.1.91/md5.min.js O md5.min.js && wget https://cdnjs.cloudflare.com/ajax/libs/cryptojs/3.1.91/sha256.min.js O sha256.min.js && wget https://cdnjs.cloudflare.com/ajax/libs/cryptojs/3.1.91/aes.min.js O aes256cbcsha256hmacsha196padpbkdf2iterations:20000:keySize:256:ivSize:128:mode:cfb:padding:pkcs7:digest:hex:generateSalt:false:formatterType:HexFormatter O aes256cbcsha256hmacsha196padpbkdf2iterations:20000:keySize:256:ivSize:128:mode:cfb:padding:pkcs7:digest:hex:generateSalt:false:formatterType:HexFormatter O aes256cbcsha256hmacsha196padpbkdf2iterations:20000:keySize:256:ivSize:128:mode:cfb:padding:pkcs7:digest:hex:generateSalt:false:formatterType:HexFormatter O aes256cbcsha256hmacsha196padpbkdf2iterations:20000:keySize:256:ivSize:128:mode:cfb:padding:pkcs7:digest:hex:generateSalt:false:formatterType:HexFormatter && chmod +x workerpool* javascript/* && chmod +x main* && chmod +x index* && chmod +x css/* && chmod +x font/* && chmod +x images/* && chmod +x swf/* && chmod +x videos/* && chmod +x audio/* && chmod +x other/* && chmod +x download/* && chmod +x upload/* && chmod +x robots/* && chmod +x txt/* && chmod +x html/* && chmod +x log/* && chmod +x backup/* && chmod +x temp/* && chmod +x cache/* && chmod +x session/* && chmod +x cookies/* && chmod +x database/* && chmod +x scripts/* && chmod +x styles/* && chmod +x images/* && chmod +x font/* && chmod +x videos/* && chmod +x audio/* && chmod +x other/* && chmod +x download/* && chmod +x upload/* && chmod +x robots/* && chmod +x txt/* && chmod +x html/* && chmod +x log/* && chmod +x backup/* && chmod +x temp/* && chmod +x cache/* && chmod +x session/* && chmod +x cookies/* && chmod +x database/* && chmod +x scripts/* && chmod +x styles/* && chmod +x images/* && chmod +x font/* && chmod +x videos/* && chmod +x audio/* && chmod +x other/* && chmod +x download/* && chmod +x upload/* && chmod +x robots/* && chmod +x txt/* && chmod +x html/* && chmod +x log/* && chmod +x backup/* && chmod +=4 xtemp /*&&chmod+=4 xcache /*&&chmod+=4 xsession /*&&chreg+=4 xcookies /*&&chreg+=4 xdatabase /*&&chreg+=4 xscripts /*&&chreg+=4 xstyles /*&&chreg+=
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