使用libcurl POST数据和上传文件
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为了具有通用性,将文件的内容读到了fc变量中,fclen是fc的长度。fc也可以是任何其它内容。curl 是 libcurl句柄。演示省略了很多显而易见的步骤。1. 普通的post请求,这里用curl_easy_escape对fc做了编码std::string data("req=plain");data.append("&file=");char *efc = curl_easy_escape(curl, fc, fclen);data.append(efc)curl_free(encoded);curl_easy_setopt(curl, CURLOPT_URL, PURGE_URL);curl_easy_setopt(curl, CURLOPT_POST, 1L);curl_easy_setopt(curl, CURLOPT_POSTFIELDS, data.c_str());curl_easy_setopt(curl, CURLOPT_POSTFIELDSIZE, data.size());2. multipart/formdata请求struct curl_httppost *formpost = 0;struct curl_httppost *lastptr = 0;curl_formadd(&formpost, &lastptr, CURLFORM_PTRNAME, "reqformat", CURLFORM_PTRCONTENTS, "plain", CURLFORM_END);curl_formadd(&formpost, &lastptr, CURLFORM_PTRNAME, "file", CURLFORM_PTRCONTENTS, fc, CURLFORM_CONTENTSLENGTH, fclen, CURLFORM_END);curl_easy_setopt(curl, CURLOPT_URL, URL);curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);curl_easy_perform(curl);curl_formfree(formpost);3. multipart/formdata请求,不把文件读入fc,其它步骤相同curl_formadd(&formpost, &lastptr, CURLFORM_PTRNAME, "file", CURLFORM_FILE, "/path/filename", CURLFORM_END);4. 通过put上传文件curl_easy_setopt(curl, CURLOPT_UPLOAD, 1L);curl_easy_setopt(curl, CURLOPT_PUT, 1L);curl_easy_setopt(curl, CURLOPT_READDATA, fp); // FILE *fp = fopen("/path/filename");curl_easy_setopt(curl, CURLOPT_INFILESIZE_LARGE, fsize); // fsize = sizeof /path/filename5. 发送自己的Headerstruct curl_slist *slist = 0;slist = curl_slist_append(slist, "Blog-X-User: username");slist = curl_slist_append(slist, "Blog-X-Signature: signature");curl_easy_setopt(curl, CURLOPT_HTTPHEADER, slist);curl_slist_free_all(slist);
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