Question

如果我这样做

curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);
curl_easy_setopt(curl, CURLOPT_POSTFIELDS, post_params);

服务器将看不到多部分，但如果我注实第二行

curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);
//curl_easy_setopt(curl, CURLOPT_POSTFIELDS, post_params);

它会的。

这里有什么问题？

UPD：所以，现在问题是，是否可以将值放到参数上，以便该值在服务器端的POST参数数组中？我正在尝试

    headers = curl_slist_append(headers, "Content-Disposition: form-data");

    //action=upload
    curl_formadd(&formpost,
        &lastptr,
        CURLFORM_COPYNAME, "action",
        CURLFORM_COPYCONTENTS, "upload",
        CURLFORM_CONTENTHEADER, headers,
        CURLFORM_CONTENTTYPE, "Content-Type: multipart/form-data",
        CURLFORM_END);

但那不起作用！

提前谢谢！

Answer 1

我最终遵循以下示例代码：http://curl.haxx.se/libcurl/c/multi-post.html

这是一个基于curl示例链接的示例代码，最终对我有用：

... 
CURL *curl;
curl_mime *form;

curl = curl_easy_init();

/*  Set the headers for the request. */
scoped_curl_slist headers;
headers.list = NULL;
string session_header = "Authorization: Bearer " + token;
headers.list = curl_slist_append(headers.list, session_header.c_str());
headers.list = curl_slist_append(headers.list, "cache-control: no-cache");
headers.list = curl_slist_append(headers.list, "Content-Type: multipart/form-data");
curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers.list);

curl_easy_setopt(curl, CURLOPT_URL, "your_url.com");

/* Create the form */
form = curl_mime_init(curl);

/* Fill in the file upload field */
curl_mimepart *field = curl_mime_addpart(form);
curl_mime_name(field, "upload");
curl_mime_filedata(field, "C:/file_name.txt");

/* Fill in the filename field */
field = curl_mime_addpart(form);
curl_mime_name(field, "name");
curl_mime_data(field, "file_name.txt", CURL_ZERO_TERMINATED);
curl_easy_setopt(curl, CURLOPT_MIMEPOST, form);

CURLcode result = curl_easy_perform(curl);
...
curl_mime_free(form);
curl_easy_cleanup(curl);
curl_slist_free_all(headers);

Answer 2

这里是官方网站的例子。如何制作多部分请求。 http://curl.haxx.se/libcurl/c/multi-post.html

curl：使用multipart with post params

2 个答案: