基于libcurl下载图片（url中可含中文）

最新推荐文章于 2023-05-29 15:17:12 发布

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最新推荐文章于 2023-05-29 15:17:12 发布

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本文介绍了一个使用cURL库从指定URL下载图片的C++程序示例。该程序通过curl_easy_init初始化cURL会话，并设置CURLOPT_URL选项来指定要下载的图片URL。此外，程序还使用了fwrite函数将图片数据写入文件。

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#include <curl/curl.h>
#include <curl/types.h>
#include <curl/easy.h>
/*
* windows may find it here-> http://www.confusedbycode.com/curl/.
*/

# This can use to download images according it's url.

# If you need thread-safe please confirm curl_global_init(CURL_GLOBAL_ALL);  at the beginning of main().

size_t write_data(void *ptr, size_t size, size_t nmemb, FILE *stream) {
    size_t written;
    written = fwrite(ptr, size, nmemb, stream);
    return written;
}

int download_pic(string uri, const string save_path) {
    CURL *curl;
    FILE *fp;
    CURLcode res;
    int last = uri.find_last_of("/") + 1;
    int nlen = uri.length() - last;
    string file_name = uri.substr(last, nlen);
    curl = curl_easy_init();
    if (curl) {
        fp = fopen(save_path.c_str(), "wb");
        char* encode_url = curl_easy_escape(curl, file_name.c_str(), 0);
        string e_url = encode_url;
        boost::algorithm::replace_first(uri, file_name, e_url);
        curl_easy_setopt(curl, CURLOPT_URL, uri.c_str());
        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_data);
        curl_easy_setopt(curl, CURLOPT_WRITEDATA, fp);
        res = curl_easy_perform(curl);
        curl_easy_cleanup(curl);
        curl_free(encode_url);
        fclose(fp);
    }
    return 0;
}