libcurl库的简介（二）

最新推荐文章于 2025-04-30 09:52:29 发布

转载最新推荐文章于 2025-04-30 09:52:29 发布 · 97 阅读

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CC 4.0 BY-SA版权

原文链接：http://www.cnblogs.com/Toney-01-22/p/9935191.html

本文详细介绍了一个使用libcurl库实现文件上传的实例代码。通过构造HTTP POST请求，该实例展示了如何将本地文件以二进制形式上传到服务器，包括设置请求头、构造表单数据等关键步骤。

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下面是使用libcurl库实现文件上传的一个实例：

void CDataProcess::sendFileToServer(void)
{
    string netIp = strNetUrl + "SaveFile";

    for (int i = 0; i < taskZipVector.size(); ++i)
    {
        string strFileName = taskZipVector[i];
        string strFilePath = strAppPath + "\\Task\\"+  strFileName + ".zip";
    
        CURL *curl = NULL;
        string readFile = "";

        struct curl_httppost *formpost=NULL;
        struct curl_httppost *lastptr=NULL;
        struct curl_slist *headerlist=NULL;
        static const char buf[] = "Expect:";

        if(-1 == _access(strFilePath.c_str(),0))
        {
            return ;
        }
        curl_global_init(CURL_GLOBAL_ALL);
        curl_formadd(&formpost,
                     &lastptr,
                     CURLFORM_COPYNAME, "fileContent",
                     CURLFORM_FILE, strFilePath.c_str(),
                     CURLFORM_END);


        curl_formadd(&formpost,
                     &lastptr,
                     CURLFORM_COPYNAME, "filename",
                     CURLFORM_COPYCONTENTS, strFileName.c_str(),
                     CURLFORM_END);

        curl_formadd(&formpost,
                     &lastptr,
                     CURLFORM_COPYNAME, "submit",
                     CURLFORM_COPYCONTENTS, "send",
                     CURLFORM_END);
                 
        curl = curl_easy_init();
        headerlist = curl_slist_append(headerlist, buf);
        curl_easy_setopt(curl, CURLOPT_URL, netIp.c_str());

        curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
        curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headerlist);
        curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);
    
        CURLcode res = curl_easy_perform(curl);
        if (res != CURLE_OK) 
        {
             //CFuncs::WriteLogInfo(SLT_ERROR, "finshUpdate() curl_easy_perform() failed: %s\n", curl_easy_strerror(res));
             return ;
        }

        isSendedFlag = 1;    //设置已传送文件标志
        curl_easy_cleanup(curl);
        curl_formfree(formpost);
        curl_slist_free_all (headerlist);
    }
}

struct curl_httppost {
　　struct curl_httppost *next; /* next entry in the list */
　　char *name; /* pointer to allocated name */
　　long namelength; /* length of name length */
　　char *contents; /* pointer to allocated data contents */
　　long contentslength; /* length of contents field, see also
　　CURL_HTTPPOST_LARGE */
　　char *buffer; /* pointer to allocated buffer contents */
　　long bufferlength; /* length of buffer field */
　　char *contenttype; /* Content-Type */
　　struct curl_slist *contentheader; /* list of extra headers for this form */
　　struct curl_httppost *more; /* if one field name has more than one
　　file, this link should link to following
　　files */
　　long flags; /* as defined below */

　　/* specified content is a file name */
　　#define CURL_HTTPPOST_FILENAME (1<<0)
　　/* specified content is a file name */
　　#define CURL_HTTPPOST_READFILE (1<<1)
　　/* name is only stored pointer do not free in formfree */
　　#define CURL_HTTPPOST_PTRNAME (1<<2)
　　/* contents is only stored pointer do not free in formfree */
　　#define CURL_HTTPPOST_PTRCONTENTS (1<<3)
　　/* upload file from buffer */
　　#define CURL_HTTPPOST_BUFFER (1<<4)
　　/* upload file from pointer contents */
　　#define CURL_HTTPPOST_PTRBUFFER (1<<5)
　　/* upload file contents by using the regular read callback to get the data and
　　pass the given pointer as custom pointer */
　　#define CURL_HTTPPOST_CALLBACK (1<<6)
　　/* use size in 'contentlen', added in 7.46.0 */
　　#define CURL_HTTPPOST_LARGE (1<<7)

　　char *showfilename; /* The file name to show. If not set, the
　　actual file name will be used (if this
　　is a file part) */
　　void *userp; /* custom pointer used for
　　HTTPPOST_CALLBACK posts */
　　curl_off_t contentlen; /* alternative length of contents
　　field. Used if CURL_HTTPPOST_LARGE is
　　set. Added in 7.46.0 */
};

struct curl_slist {
　　char *data;
　　struct curl_slist *next;
};

CURL_EXTERN CURLFORMcode curl_formadd(struct curl_httppost **httppost, struct curl_httppost **last_post,.);

转载于:https://www.cnblogs.com/Toney-01-22/p/9935191.html