C libcurl force "Content-Type“

Question

我有下面的C代码用libcurl上传一个文件到我的now服务器，几乎可以，唯一的问题我需要上传是"Content-Type: application/vnd.ms-excel“，但它得到"Content-Type: application/octet-stream"，尝试使用头文件，但现在幸运的是。在PHP中使用curl是很容易的，我只需要做curl_setopt($ch, CURLOPT_POSTFIELDS, array("importfile" => "@".$file_path . ";type=application/vnd.ms-excel"就可以了。有什么帮助吗？想法？

#include <stdio.h>
#include <string.h>
#include <curl/curl.h>

int main(int argc, char *argv[])
{
  CURL *curl;
  CURLcode res;

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

  curl_global_init(CURL_GLOBAL_ALL);

  curl_formadd(&formpost, &lastptr, CURLFORM_COPYNAME, "importfile", CURLFORM_FILE, "document.csv", CURLFORM_END);
  curl_formadd(&formpost, &lastptr, CURLFORM_COPYNAME, "action", CURLFORM_COPYCONTENTS, "upload", CURLFORM_END);

  curl = curl_easy_init();
  headerlist = curl_slist_append(headerlist, buf);
  if(curl) {
    curl_easy_setopt(curl, CURLOPT_URL, "http://www.myhost.com/upload/upload.php");
    if ( (argc == 2) && (!strcmp(argv[1], "noexpectheader")) )
      curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headerlist);
    curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);

    res = curl_easy_perform(curl);
    if(res != CURLE_OK)
      fprintf(stderr, "curl_easy_perform() failed: %s\n",
              curl_easy_strerror(res));

    curl_easy_cleanup(curl);

    curl_formfree(formpost);
    curl_slist_free_all (headerlist);
  }
  return 0;
}

尝试将标题添加为"Content-Type: application/vnd.ms-excel“，但不正确，我得到：

Content-Type: application/vnd.ms-excel

在标题中，但我需要：

------WebbbbFormBoundaryXaI1UTNwqAyKWvLT
Content-Disposition: form-data; name="importfile"; filename="document.csv"
Content-Type: application/vnd.ms-excel

相反，我得到的是：

------WebbbbFormBoundaryXaI1UTNwqAyKWvLT
Content-Disposition: form-data; name="importfile"; filename="document.csv"
Content-Type: application/octet-stream

感谢你们的帮助，答案是：

curl_formadd(&formpost, &lastptr, CURLFORM_COPYNAME, "importfile", CURLFORM_FILE, "document.csv", CURLFORM_CONTENTTYPE, "application/vnd.ms-excel", CURLFORM_END);

Answer 1

您正在寻找curl_formadd的选项CURLFORM_CONTENTTYPE。