objective-c - libcURL 代码不工作，说我正在上传到没有文件名的服务器

Question

在使用 的 FTP uploader 上工作时，我遇到了一个奇怪的错误，这让我很困惑。我已经阅读了文档，但我真的很困惑。它连接到正确的服务器，因为在详细模式下显示输出，但随后它在控制台中出现以下错误而终止:

* Entry path is '/'
* Uploading to a URL without a file name!
* Closing connection #0
* URL using bad/illegal format or missing URL

代码如下:

int upload_music_file(const char* music_file, const char* short_music_file) {
strcpy(DESTINATION_MUSIC_FILE, music_file);
strcpy(REMOTE_MUSIC_FILE, short_music_file);

[musicFileField setStringValue:[NSString stringWithFormat:@"%s", DESTINATION_MUSIC_FILE]];
[curFileProgress setDoubleValue:0];

CURL *curl;
CURLcode res;
FILE *hd_src;
struct stat file_info;
curl_off_t fsize;

/* get the file size of the local file */
printf("Destination music file: %s\n", DESTINATION_MUSIC_FILE);
if(stat(DESTINATION_MUSIC_FILE, &file_info)) {
    printf("Couldn't open music file %s: %s\n", DESTINATION_MUSIC_FILE, strerror(errno));
    return 1;
}
fsize = (curl_off_t)file_info.st_size;

#ifdef DEBUG
printf("Local music file size: %" CURL_FORMAT_CURL_OFF_T " bytes.\n", fsize);
#endif

[curFileProgress setMaxValue:(double)fsize];

/* get a FILE* of the same file */
hd_src = fopen(DESTINATION_MUSIC_FILE, "rb");

/* In windows, this will init the winsock stuff */
curl_global_init(CURL_GLOBAL_ALL);

/* get a curl handle */
curl = curl_easy_init();
if(curl) {
    curl_easy_setopt(curl, CURLOPT_URL, "ftp://orangesquirrels.com/");
    curl_easy_setopt(curl, CURLOPT_VERBOSE, 1);
    printf("UPLD MUSK: Remote URL: %s\n", REMOTE_URL);

    /* we want to use our own read function */
    curl_easy_setopt(curl, CURLOPT_READFUNCTION, music_read_callback);

    /* enable uploading */
    curl_easy_setopt(curl, CURLOPT_UPLOAD, 1L);

    /* specify target */
    printf("Remote Music File: %s\n", REMOTE_MUSIC_FILE);
    fflush(stdout);
    //curl_easy_setopt(curl, CURLOPT_URL, REMOTE_MUSIC_FILE);

    /* pass in that last of FTP commands to run after the transfer */
    //curl_easy_setopt(curl, CURLOPT_POSTQUOTE, headerlist);

    /* now specify which file to upload */
    curl_easy_setopt(curl, CURLOPT_READDATA, hd_src);

    curl_easy_setopt(curl, CURLOPT_USERNAME, (char *)loginUser);

    curl_easy_setopt(curl, CURLOPT_PASSWORD, (char *)loginPassword);

    /* Set the size of the file to upload (optional).  If you give a *_LARGE
     option you MUST make sure that the type of the passed-in argument is a
     curl_off_t. If you use CURLOPT_INFILESIZE (without _LARGE) you must
     make sure that to pass in a type 'long' argument. */
    curl_easy_setopt(curl, CURLOPT_INFILESIZE_LARGE,
                     (curl_off_t)fsize);

    /* Now run off and do what you've been told! */
    res = curl_easy_perform(curl);
    /* Check for errors */
    if(res != CURLE_OK)
    {
        fprintf(stderr, "UPLD MUSK: curl_easy_perform() failed: %s\n", curl_easy_strerror(res));
        if (strcmp("Remote file not found", curl_easy_strerror(res)) != 0) // The file won't exist since we're creating it.
        {
            [SBErrorNotice performSelectorOnMainThread:@selector(showError:) withObject:[NSString stringWithUTF8String:curl_easy_strerror(res)] waitUntilDone:NO];
            //[SBErrorNotice showError:[NSString stringWithUTF8String:curl_easy_strerror(res)]];
            errorOccurred = true;
        }
    }

    /* always cleanup */
    curl_easy_cleanup(curl);
}

fclose(hd_src); /* close the local file */

curl_global_cleanup();
return 0;
}

这是完整的控制台输出(删除了用户名和密码):

Destination music file: /Users/user/Music/button-1.mp3
Local music file size: 10498 bytes.
UPLD MUSK: Remote URL: ftp://orangesquirrels.com
Remote Music File: button-1.mp3
* About to connect() to orangesquirrels.com port 21 (#0)
*   Trying 50.63.71.1...
* connected
* Connected to orangesquirrels.com (50.63.71.1) port 21 (#0)
< 220---------- Welcome to Pure-FTPd [privsep] [TLS] ----------
< 220-You are user number 9 of 500 allowed.
< 220-Local time is now 15:23. Server port: 21.
< 220-This is a private system - No anonymous login
< 220 You will be disconnected after 3 minutes of inactivity.
> USER -------
< 331 User ------- OK. Password required
> PASS -----------
< 230 OK. Current restricted directory is /
> PWD
< 257 "/" is your current location
* Entry path is '/'
* Uploading to a URL without a file name!
* Closing connection #0
* URL using bad/illegal format or missing URL
UPLD MUSK: curl_easy_perform() failed: URL using bad/illegal format or missing URL

如有任何帮助，我们将不胜感激。

Answer 1

设置 URL 时，还必须指定文件名。替换:

 curl_easy_setopt(curl, CURLOPT_URL, "ftp://orangesquirrels.com/");

与:

 curl_easy_setopt(curl, CURLOPT_URL, "ftp://orangesquirrels.com/myfile.txt");