Calling nlst or dir function on FTPConnection causes the program to silently exit

[souravdatta]

I am not entirely sure whether this issue is with the library or the Windows 7 64bit system I am using. I am new to Haskell and was trying to write a rudimentary ftp app for my own use. The test case is:

module FtpTest
        where

import Network.FTP.Client
import Network.FTP.Client.Parser

display :: Maybe String -> IO ()
display (Just path) = putStrLn path
display Nothing = putStrLn "No path!"

ftpTest :: String -> String -> String -> IO Network.FTP.Client.Parser.FTPResult
ftpTest host usr pass = do
    enableFTPDebugging
    h <- easyConnectFTP host
    login h usr (Just pass) Nothing
    (pwd, _) <- pwd h
    display pwd
    putStrLn "Going to list dir"
    fs <- dir h Nothing
    putStrLn "Done"
    quit h

When running the ftpTest function, I get the current directory and "Going to list dir" printed. But then the program exits silently. I have also tried nlst function but the behaviour is same.

The log below shows output with enableFTPDebugging.

*FtpTest> ftpTest "" "" "" Loading package array-0.5.0.0 ... linking ... done. Loading package deepseq-1.3.0.2 ... linking ... done. Loading package bytestring-0.10.4.0 ... linking ... done. Loading package Win32-2.3.0.2 ... linking ... done. Loading package transformers-0.3.0.0 ... linking ... done. Loading package old-locale-1.0.0.6 ... linking ... done. Loading package time-1.4.2 ... linking ... done. Loading package containers-0.5.5.1 ... linking ... done. Loading package mtl-2.1.3.1 ... linking ... done. Loading package regex-base-0.93.2 ... linking ... done. Loading package regex-posix-0.95.2 ... linking ... : warning: isal um from msvcrt is linked instead of __imp_isalnum : warning: isalnum from msvcrt is linked instead of __imp_isalnum : warning: isalnum from msvcrt is linked instead of __imp_isalnum : warning: isalnum from msvcrt is linked instead of __imp_isalnum : warning: isalnum from msvcrt is linked instead of __imp_isalnum : warning: isalnum from msvcrt is linked instead of __imp_isalnum : warning: isalnum from msvcrt is linked instead of __imp_isalnum : warning: isalnum from msvcrt is linked instead of __imp_isalnum : warning: isalnum from msvcrt is linked instead of __imp_isalnum : warning: isalnum from msvcrt is linked instead of __imp_isalnum : warning: isalnum from msvcrt is linked instead of __imp_isalnum : warning: isalnum from msvcrt is linked instead of __imp_isalnum : warning: isupper from msvcrt is linked instead of __imp_isupper : warning: toupper from msvcrt is linked instead of __imp_toupper : warning: tolower from msvcrt is linked instead of __imp_tolower : warning: isalpha from msvcrt is linked instead of __imp_isalpha : warning: isalpha from msvcrt is linked instead of __imp_isalpha : warning: isalpha from msvcrt is linked instead of __imp_isalpha : warning: iscntrl from msvcrt is linked instead of __imp_iscntrl : warning: isupper from msvcrt is linked instead of __imp_isupper : warning: isgraph from msvcrt is linked instead of __imp_isgraph : warning: isprint from msvcrt is linked instead of __imp_isprint : warning: ispunct from msvcrt is linked instead of __imp_ispunct : warning: isalnum from msvcrt is linked instead of __imp_isalnum : warning: isalpha from msvcrt is linked instead of __imp_isalpha done. Loading package regex-compat-0.95.1 ... linking ... done. Loading package text-1.1.0.0 ... linking ... done. Loading package parsec-3.1.5 ... linking ... done. Loading package old-time-1.1.0.2 ... linking ... done. Loading package network-2.4.2.3 ... linking ... : warning: inet_nt a from ws2_32 is linked instead of __imp_inet_ntoa : warning: getnameinfo from ws2_32 is linked instead of __imp_getn meinfo : warning: getaddrinfo from ws2_32 is linked instead of __imp_geta drinfo : warning: freeaddrinfo from ws2_32 is linked instead of __imp_fre addrinfo : warning: accept from ws2_32 is linked instead of __imp_accept : warning: WSACleanup from ws2_32 is linked instead of __imp_WSACl anup : warning: WSAStartup from ws2_32 is linked instead of __imp_WSASt rtup : warning: WSACleanup from ws2_32 is linked instead of __imp_WSACl anup done. Loading package filepath-1.3.0.2 ... linking ... done. Loading package directory-1.2.1.0 ... linking ... done. Loading package HUnit-1.2.5.2 ... linking ... done. Loading package process-1.2.0.0 ... linking ... done. Loading package hslogger-1.2.8 ... linking ... done. Loading package random-1.0.1.1 ... linking ... done. Loading package MissingH-1.3.0.1 ... linking ... done. Loading package ftphs-1.0.9.1 ... linking ... done. FTP received: 220 (vsFTPd 2.0.5) FTP sent: USER FTP received: 331 Please specify the password. FTP sent: PASS FTP received: 230 Login successful. FTP sent: PWD FTP received: 257 "/home/uname" /home/uname Going to list dir FTP sent: TYPE A FTP received: 200 Switching to ASCII mode. FTP sent: PASV FTP received: 227 Entering Passive Mode (10,240,106,18,41,229)

System information:

OS - Windows 7 64 bit Haskell - Fresh installation of Haskell platform downloaded from the distribution site. ftphs - installed using Cabal.

[souravdatta]

Also, I have tested this on a Mac and Ubuntu box, connecting to the same FTP server and that worked, so the problem is Windows specific.

[wochinge]

I have the same issue. Apparently the libs are not usable for windows.