在C语言中连接天气API,通常需要使用网络库(如libcurl)来发送HTTP请求,以下是一个简单的示例,展示了如何使用libcurl库从OpenWeatherMap API获取天气信息。
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1、确保已经安装了libcurl库,在Ubuntu系统中,可以使用以下命令安装:
sudo aptget install libcurl4openssldev
2、创建一个名为weather.c
的C文件,并添加以下代码:
#include <stdio.h> #include <stdlib.h> #include <string.h> #include <curl/curl.h> // 回调函数,用于处理接收到的数据 size_t write_callback(char *ptr, size_t size, size_t nmemb, void *userdata) { size_t realsize = size * nmemb; char *buffer = (char *)userdata; memcpy(buffer, ptr, realsize); buffer[realsize] = ' '; return realsize; } int main() { CURL *curl; CURLcode res; char url[] = "https://api.openweathermap.org/data/2.5/weather?q=北京&appid=your_api_key"; // 替换为你的API密钥 char buffer[1024]; curl_global_init(CURL_GLOBAL_DEFAULT); curl = curl_easy_init(); if(curl) { curl_easy_setopt(curl, CURLOPT_URL, url); curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_callback); curl_easy_setopt(curl, CURLOPT_WRITEDATA, buffer); res = curl_easy_perform(curl); if(res != CURLE_OK) { fprintf(stderr, "curl_easy_perform() failed: %s ", curl_easy_strerror(res)); } else { printf("Weather information: %s ", buffer); } curl_easy_cleanup(curl); } curl_global_cleanup(); return 0; }
3、将your_api_key
替换为你在OpenWeatherMap网站上注册的API密钥,如果没有API密钥,请先注册一个,注意,免费计划每天有限制的请求次数。
4、编译并运行程序:
gcc weather.c o weather lcurl ./weather
程序将输出类似以下格式的天气信息:
Weather information: {"coord":{"lon":116.4074,"lat":39.9042},"weather":[{"id":803,"main":"Clouds","description":"broken clouds","icon":"04d"}],"base":"stations","main":{"temp":293.15,"pressure":1012,"humidity":81,"temp_min":291.15,"temp_max":295.15},"visibility":16093,"wind":{"speed":1.1,"deg":300},"clouds":{"all":75},"dt":1629459200,"sys":{"type":2,"id":2019686,"country":"CN","sunrise":1629422743,"sunset":1629478177},"timezone":86400,"id":101010100,"name":"Beijing","cod":200}
这个示例展示了如何使用libcurl库从OpenWeatherMap API获取天气信息,你可以根据需要修改代码,以连接到其他天气API或获取其他类型的数据。
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