libcurl提交表单上传文件

不多说了，curl的http上传文件代码示例，有需要的可以参考。

int http_post_file(const char *url, const char *user, const char *pwd, const char *filename)
{
assert(url != NULL);
assert(user != NULL);
assert(pwd != NULL);
assert(filename != NULL);

int ret = -1;
CURL *curl = NULL;
CURLcode code;
CURLFORMcode formCode;
int timeout = 15;

#define CHECK_FORM_ERROR(x)                                                /
if ((formCode = (x)) != CURL_FORMADD_OK)                            /
{                                                                    /
fprintf(stderr, "curl_formadd[%d] error./n", formCode);            /
goto out;                                                        /
}

#define CHECK_SETOPT_ERROR(x)                                            /
if ((code = (x)) != CURLE_OK)                                        /
{                                                                    /
fprintf(stderr, "curl_easy_setopt[%d] error./n", code);            /
goto all;                                                        /
}

struct curl_httppost *post=NULL;
struct curl_httppost *last=NULL;
struct curl_slist *headerlist=NULL;

CHECK_FORM_ERROR( curl_formadd(&post, &last, CURLFORM_COPYNAME, "user",
CURLFORM_COPYCONTENTS, user,
CURLFORM_END));

CHECK_FORM_ERROR( curl_formadd(&post, &last, CURLFORM_COPYNAME, "password",
CURLFORM_COPYCONTENTS, pwd,
CURLFORM_END));

CHECK_FORM_ERROR( curl_formadd(&post, &last, CURLFORM_COPYNAME, "file",
CURLFORM_FILE, filename,
CURLFORM_END));

CHECK_FORM_ERROR( curl_formadd(&post, &last,
CURLFORM_COPYNAME, "submit",
CURLFORM_COPYCONTENTS, "upload",
CURLFORM_END));

curl = curl_easy_init();
if(curl == NULL)
{
fprintf(stderr, "curl_easy_init() error./n");
goto out;
}

CHECK_SETOPT_ERROR(curl_easy_setopt(curl, CURLOPT_HEADER, 0));
CHECK_SETOPT_ERROR(curl_easy_setopt(curl, CURLOPT_URL, url));
CHECK_SETOPT_ERROR(curl_easy_setopt(curl, CURLOPT_HTTPPOST, post));
CHECK_SETOPT_ERROR(curl_easy_setopt(curl, CURLOPT_TIMEOUT, timeout));

code = curl_easy_perform(curl);
if(code != CURLE_OK)
{
fprintf(stderr, "curl_easy_perform[%d] error./n", code);
goto all;
}

ret = 0;

all:
curl_easy_cleanup(curl);
out:
curl_formfree(post);

return ret;
}