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# ftp_nb_get

(no version information, might be only in CVS)

ftp_nb_get -- Retrieves a file from the FTP server and writes it to a local file (non-blocking)

## Description

bool ftp_nb_get ( resource ftp_stream, string local_file, string remote_file, int mode [, int resumepos])

ftp_nb_get() retrieves `remote_file` from the FTP server, and saves it to `local_file` locally. The transfer `mode` specified must be either `FTP_ASCII` or `FTP_BINARY`. The difference between this function and the ftp_get() is that this function retrieves the file asynchronously, so your program can perform other operations while the file is being downloaded.

Returns `TRUE` on success or `FALSE` on error.

例 1ftp_nb_get() example

    // Initate the download
    $ret = ftp_nb_get($my_connection, "test", "README", FTP_BINARY);
    while ($ret == FTP_MOREDATA) {

       // Do whatever you want
       echo ".";

       // Continue downloading...
       $ret = ftp_nb_continue ($my_connection);
    }
    if ($ret != FTP_FINISHED) {
       echo "There was an error downloading the file...";
       exit(1);
    }

例 2Resuming a download with ftp_nb_get()

    // Initate
    $ret = ftp_nb_get ($my_connection, "test", "README", FTP_BINARY,
                          filesize("test"));
    // OR: $ret = ftp_nb_get ($my_connection, "test", "README",
    //                           FTP_BINARY, FTP_AUTORESUME);
    while ($ret == FTP_MOREDATA) {

       // Do whatever you want
       echo ".";

       // Continue downloading...
       $ret = ftp_nb_continue ($my_connection);
    }
    if ($ret != FTP_FINISHED) {
       echo "There was an error downloading the file...";
       exit(1);
    }

例 3 Resuming a download at position 100 to a new file with ftp_nb_get()

    // Disable Autoseek
    ftp_set_option ($my_connection, FTP_AUTOSEEK, FALSE);

    // Initiate
    $ret = ftp_nb_get ($my_connection, "newfile", "README", FTP_BINARY, 100);
    while ($ret == FTP_MOREDATA) {

       ...

       // Continue downloading...
       $ret = ftp_nb_continue ($my_connection);
    }

In the example above, `"newfile"` is 100 bytes smaller than `"README"` on the FTP server because we started reading at offset 100. If we have not have disabled `FTP_AUTOSEEK`, the first 100 bytes of newfile will be `'\0'`.

See also ftp_nb_fget(), ftp_nb_continue(), ftp_get() and ftp_fget().

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