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/filename 5. 发送自己的Header struct 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);