一、客户端文件上传
libcurl上传文件有两种方式：
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；
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 */
附上开发中写的程序代码
1 int UploadFile(char *file_name, char *dir_name, char *save_name)View Code
2 {
3 char buff[128];
4 CURL *curl;
5
6 CURLM *multi_handle;
7 int still_running;
8
9 struct curl_httppost *formpost=NULL;
10 struct curl_httppost *lastptr=NULL;
11 struct curl_slist *headerlist=NULL;
12 static const char buf[] = "Expect:";
13
14 sprintf(buff, "%s%s%s%s", dir_name, "-", save_name, ".jpg");
15 /* Fill in the file upload field. This makes libcurl load data from
16 the given file name when curl_easy_perform() is called. */
17 curl_formadd(&formpost,
18 &lastptr,
19 CURLFORM_COPYNAME, "file",
20 CURLFORM_FILE, file_name,
21 CURLFORM_CONTENTTYPE, "Image/jpeg",
22 CURLFORM_FILENAME, buff,
23 CURLFORM_END);
24
25 /* Fill in the filename field */
26 curl_formadd(&formpost,
27 &lastptr,
28 CURLFORM_COPYNAME, "filename",
29 CURLFORM_COPYCONTENTS, save_name,
30 CURLFORM_END);
31
32 /* Fill in the submit field too, even if this is rarely needed */
33 curl_formadd(&formpost,
34 &lastptr,
35 CURLFORM_COPYNAME, "directory",
36 CURLFORM_COPYCONTENTS, dir_name,
37 CURLFORM_END);
38
39 curl = curl_easy_init();
40 multi_handle = curl_multi_init();
41
42 /* initalize custom header list (stating that Expect: 100-continue is not
43 wanted */
44 headerlist = curl_slist_append(headerlist, buf);
45 if(curl && multi_handle) {
46
47 /* what URL that receives this POST */
48 curl_easy_setopt(curl, CURLOPT_URL, "https://app.sopings.com/lock/control/_UploadFile.php");
49 curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
50
51 curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headerlist);
52 curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);
53
54 if (1) {
55 curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0);
56 curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0);
57 }
58
59 curl_multi_add_handle(multi_handle, curl);
60
61 curl_multi_perform(multi_handle, &still_running);
62
63 do {
64 struct timeval timeout;
65 int rc; /* select() return code */
66
67 fd_set fdread;
68 fd_set fdwrite;
69 fd_set fdexcep;
70 int maxfd = -1;
71
72 long curl_timeo = -1;
73
74 FD_ZERO(&fdread);
75 FD_ZERO(&fdwrite);
76 FD_ZERO(&fdexcep);
77
78 /* set a suitable timeout to play around with */
79 timeout.tv_sec = 1;
80 timeout.tv_usec = 0;
81
82 curl_multi_timeout(multi_handle, &curl_timeo);
83 if(curl_timeo >= 0) {
84 timeout.tv_sec = curl_timeo / 1000;
85 if(timeout.tv_sec > 1)
86 timeout.tv_sec = 1;
87 else
88 timeout.tv_usec = (curl_timeo % 1000) * 1000;
89 }
90
91 /* get file descriptors from the transfers */
92 curl_multi_fdset(multi_handle, &fdread, &fdwrite, &fdexcep, &maxfd);
93
94 /* In a real-world program you OF COURSE check the return code of the
95 function calls. On success, the value of maxfd is guaranteed to be
96 greater or equal than -1. We call select(maxfd + 1, ...), specially in
97 case of (maxfd == -1), we call select(0, ...), which is basically equal
98 to sleep. */
99
100 rc = select(maxfd+1, &fdread, &fdwrite, &fdexcep, &timeout);
101
102 switch(rc) {
103 case -1:
104 /* select error */
105 break;
106 case 0:
107 default:
108 /* timeout or readable/writable sockets */
109 printf("perform!\n");
110 curl_multi_perform(multi_handle, &still_running);
111 printf("running: %d!\n", still_running);
112 break;
113 }
114 } while(still_running);
115
116 curl_multi_cleanup(multi_handle);
117
118 /* always cleanup */
119 curl_easy_cleanup(curl);
120
121 /* then cleanup the formpost chain */
122 curl_formfree(formpost);
123
124 /* free slist */
125 curl_slist_free_all (headerlist);
126 }
127 return 0;
128 }
服务器端的接收代码（PHP）
<?phpView Code
require_once (__DIR__."/../libs/Error.php");
include_once (__DIR__."/../db/Db.php");
/**
* 上传文件
* @author 戴栋根
* @version 1.0
* @created 16-三月-2016
*/
if ((($_FILES["file"]["type"] == "Image/png")
|| ($_FILES["file"]["type"] == "Image/jpeg")
|| ($_FILES["file"]["type"] == "Image/pjpeg"))
&& ($_FILES["file"]["size"] < 10000000))
{
if ($_FILES["file"]["error"] > 0)
{
echo Error::getRetString(10021);
}
else
{
echo "Upload: " . $_FILES["file"]["name"] . "<br />";
echo "Type: " . $_FILES["file"]["type"] . "<br />";
echo "Size: " . ($_FILES["file"]["size"] / 1024) . " Kb<br />";
echo "Temp file: " . $_FILES["file"]["tmp_name"] . "<br />";
if (!file_exists($_FILES["directory"]["type"]))
{
mkdir ($_FILES["directory"]["type"]);
}
if (file_exists($_FILES["directory"]["type"]."/" . $_FILES["filename"]["type"]))
{
echo $_FILES["file"]["name"] . " already exists. ";
}
else
{
move_uploaded_file($_FILES["file"]["tmp_name"],
$_FILES["directory"]["type"]."/" . $_FILES["filename"]["type"]);
echo "Stored in: " . $_FILES["directory"]["type"]."/" . $_FILES["filename"]["type"];
}
}
}
else
{
echo Error::getRetString(10007);
}
?>