libcurl上传文件

libcurl参数很多，一不小心就容易遇到问题。曾经就遇到过一个很蛋疼的问题：libcurl断点下载>>

这里主要汇总一下，libcurl上传的二种方式：

1、直接上传文件，类似form表单<input type=”file” />，<form enctype=”multipart/form-data”…；

2、上传二进制流；

至于设定自定义头，都是使用一样的方法

struct curl_slist *headers=NULL;
headers = curl_slist_append(headers, "Content-Type: text/xml");
headers = curl_slist_append(headers, "Accept: text/html, */*;q=0.01");
//...

//set headers
curl_easy_setopt(easyhandle, CURLOPT_HTTPHEADER, headers);


//last free the header list
curl_slist_free_all(headers); /* free the header list */

前往官网查看CURLOPT_HTTPHEADER>>

直接上传文件：

struct curl_httppost *formpost = NULL;
struct curl_httppost *lastptr = NULL;
 
curl_formadd(&formpost, &lastptr,
    CURLFORM_COPYNAME, "uploadfile",
    CURLFORM_FILE, "/",//imagepath
    CURLFORM_CONTENTTYPE, "Image/jpeg",
    CURLFORM_END);
 
curl_formadd(&formpost, &lastptr,
    CURLFORM_COPYNAME, "filename",
    CURLFORM_COPYCONTENTS, "test.jpg",
    CURLFORM_END);
 
curl_easy_setopt(m_curl,CURLOPT_HTTPPOST,formpost);
  
//last free post
curl_formfree(formpost);

如果上传其它文件类型，那就在curl_formadd中附加CURLFORM_CONTENTTYPE参数（Content-Type/Mime-Type）

二进制流上传：

//referer http://curl.haxx.se/mail/lib-2003-08/0190.html
curl_formadd(&post, &last, 
             CURLFORM_COPYNAME, "file", 
             CURLFORM_BUFFER, "unnamed.png", 
             CURLFORM_BUFFERPTR, memblock,     
             CURLFORM_BUFFERLENGTH, memblock_length, 
             CURLFORM_CONTENTTYPE, "image/png",
             CURLFORM_END); 

 
‘file' is the name of this part, 'unnamed.png' is the name set in the file name field.