1，html中 通過 form-data方式的。 是走的代碼中的 handle_upload，上傳後文件按照原來的名字保存在根目錄。
2，html中 通過ajax方式上傳的 走的是 handle_upload_bk 裏面的部分，但是這個我沒法提取出來文件名。
3，還有就是走 handle_upload_bk 的時候，從 form-data上傳。 顯示也能上傳。 但是不知道走到哪裏的邏輯了。 走的handle_upload_bk 這個邏輯。
補充：在 handle_upload_bk 裏面 mp->file_name就可以獲取 文件名了。。 終於找到了
<!DOCTYPE html>
<html>
<head>
<title>AJAX Upload Example</title>
<script src="//code.jquery.com/jquery-1.9.1.js"></script>
<script type="text/javascript">
function updateProgress(evt) {
if (evt.lengthComputable) {
document.getElementById("output").textContent =
"Uploaded " + evt.loaded + " of " + evt.total + " bytes";
}
}
function uploadFile() {
var file_data = new FormData(document.getElementById('filename'));
$.ajax({
url: "/upload",
type: "POST",
data: file_data,
processData: false,
contentType: false,
cache: false,
xhr: function() {
myXhr = $.ajaxSettings.xhr();
if(myXhr.upload){
myXhr.upload.addEventListener('progress',updateProgress, false); // for handling the progress of the upload
}
return myXhr;
},
}).done(function(data) {
document.getElementById("output").textContent = "Result: " + data;
});
return false;
}
</script>
</head>
<body>
<h1>Upload file using standard form upload</h1>
<form method="POST" action="/upload" enctype="multipart/form-data">
<label>Select a file:</label><br>
<input type="file" name="file" />
<input type="submit" value="Upload" />
</form>
<h1>Upload file using Ajax - that also gives progress report</h1>
<form method="post" id="filename" name="filename" οnsubmit="return uploadFile();">
<label>Select a file:</label><br>
<input type="file" id="file" name="file" required />
<input type="submit" value="Upload" />
</form>
<br><br><div id="output"></div>
</body>
</html>
// Copyright (c) 2015 Cesanta Software Limited
// All rights reserved
#include "mongoose.h"
static const char *s_http_port = "8000";
static struct mg_serve_http_opts s_http_server_opts;
struct file_writer_data {
FILE *fp;
size_t bytes_written;
};
static void handle_upload_bk(struct mg_connection *nc, int ev, void *p) {
struct file_writer_data *data = (struct file_writer_data *) nc->user_data;
struct mg_http_multipart_part *mp = (struct mg_http_multipart_part *) p;
switch (ev) {
case MG_EV_HTTP_PART_BEGIN: {
if (data == NULL) {
data = calloc(1, sizeof(struct file_writer_data));
data->fp = tmpfile();
data->bytes_written = 0;
if (data->fp == NULL) {
mg_printf(nc, "%s",
"HTTP/1.1 500 Failed to open a file\r\n"
"Content-Length: 0\r\n\r\n");
nc->flags |= MG_F_SEND_AND_CLOSE;
free(data);
return;
}
nc->user_data = (void *)data;
}
break;
}
case MG_EV_HTTP_PART_DATA: {
if (fwrite(mp->data.p, 1, mp->data.len, data->fp) != mp->data.len) {
mg_printf(nc, "%s",
"HTTP/1.1 500 Failed to write to a file\r\n"
"Content-Length: 0\r\n\r\n");
nc->flags |= MG_F_SEND_AND_CLOSE;
return;
}
data->bytes_written += mp->data.len;
break;
}
case MG_EV_HTTP_PART_END: {
mg_printf(nc,
"HTTP/1.1 200 OK\r\n"
"Content-Type: text/plain\r\n"
"Connection: close\r\n\r\n"
"Written %ld of POST data to a temp file\n\n",
(long)ftell(data->fp));
nc->flags |= MG_F_SEND_AND_CLOSE;
fclose(data->fp);
free(data);
nc->user_data = NULL;
break;
}
}
}
struct mg_str cb(struct mg_connection *c, struct mg_str file_name) {
// Return the same filename. Do not actually do this except in test!
// fname is user-controlled and needs to be sanitized.
return file_name;
}
void handle_upload(struct mg_connection *c, int ev, void *ev_data) {
switch (ev) {
case MG_EV_HTTP_PART_BEGIN:
case MG_EV_HTTP_PART_DATA:
case MG_EV_HTTP_PART_END:
case MG_EV_HTTP_MULTIPART_REQUEST_END:
mg_file_upload_handler(c, ev, ev_data, cb);
break;
}
}
static void ev_handler(struct mg_connection *nc, int ev, void *p) {
if (ev == MG_EV_HTTP_REQUEST) {
mg_serve_http(nc, (struct http_message *) p, s_http_server_opts);
}
}
int main(void) {
struct mg_mgr mgr;
struct mg_connection *nc;
mg_mgr_init(&mgr, NULL);
printf("Starting web server on port %s\n", s_http_port);
nc = mg_bind(&mgr, s_http_port, ev_handler);
if (nc == NULL) {
printf("Failed to create listener\n");
return 1;
}
// Set up HTTP server parameters
mg_set_protocol_http_websocket(nc);
s_http_server_opts.document_root = "."; // Serve current directory
s_http_server_opts.enable_directory_listing = "yes";
mg_register_http_endpoint(nc, "/upload", handle_upload MG_UD_ARG(NULL));
for (;;) {
mg_mgr_poll(&mgr, 1000);
}
mg_mgr_free(&mgr);
return 0;
}