I'm using the wininet.dll FtpGetFile and FtpPutFile functions from
VBA, but they just return a boolean success-or-fail. Does anyone know
how to get more info about the transfer, e.g. why it failed or how
many bytes were transferred?

Phil Hibbs.

I've got this working now by separately querying the file size before
download or after upload. Here is my FTP module, mostly cribbed from
the interweb. FTP_Get_File and FTP_Put_File are my generic functions,
at the end. One minor concern I have is that I'm not calling any
function to close the file, but that shouldn't be a problem once the
connection is closed.

Option Explicit
'//
'// Dedicated to my Friend Colo
'// Some of the code from http://www.allapi.net
'// spec thanks to Joacim Andersson 29 July 2001
'// Amendments by Ivan F Moala 28 Sept 2002
'// Amendments by Phil Hibbs 2 Dec 2009
'//

Public Const FTP_TRANSFER_TYPE_UNKNOWN = &H0
Public Const FTP_TRANSFER_TYPE_ASCII = &H1
Public Const FTP_TRANSFER_TYPE_BINARY = &H2
Private Const INTERNET_SERVICE_FTP = 1
Private Const INTERNET_SERVICE_GOPHER = 2
Private Const INTERNET_SERVICE_HTTP = 3
Private Const INTERNET_FLAG_PASSIVE = &H8000000 '// used for FTP
connections
Private Const INTERNET_OPEN_TYPE_PRECONFIG = 0 '// use registry
configuration
Private Const INTERNET_OPEN_TYPE_DIRECT = 1 '// direct to net
Private Const INTERNET_OPEN_TYPE_PROXY = 3 '// via named
proxy
Private Const _
INTERNET_OPEN_TYPE_PRECONFIG_WITH_NO_AUTOPROXY = 4 '// prevent
using java/script/INS
Private Const MAX_PATH = 260

Private Const INTERNET_INVALID_PORT_NUMBER = 0 '// use the protocol-
specific default
Private Const INTERNET_DEFAULT_FTP_PORT = 21 '// default for FTP
servers
Private Const INTERNET_DEFAULT_GOPHER_PORT = 70 '// " "
gopher "
Private Const INTERNET_DEFAULT_HTTP_PORT = 80 '// " "
HTTP "
Private Const INTERNET_DEFAULT_HTTPS_PORT = 443 '// " "
HTTPS "
Private Const INTERNET_DEFAULT_SOCKS_PORT = 1080 '// default for SOCKS
firewall servers.

Private Const GENERIC_READ = &H80000000
Private Const MAXDWORD As Double = (2 ^ 32) - 1

Private Type FILETIME
dwLowDateTime As Long
dwHighDateTime As Long
End Type

Private Type WIN32_FIND_DATA
dwFileAttributes As Long
ftCreationTime As FILETIME
ftLastAccessTime As FILETIME
ftLastWriteTime As FILETIME
nFileSizeHigh As Long
nFileSizeLow As Long
dwReserved0 As Long
dwReserved1 As Long
cFileName As String * MAX_PATH
cAlternate As String * 14
End Type

Declare Function InternetCloseHandle Lib "wininet.dll" ( _
ByVal hInet As Long) As Integer

Declare Function InternetConnect Lib "wininet.dll" _
Alias "InternetConnectA" ( _
ByVal hInternetSession As Long, _
ByVal sServerName As String, _
ByVal nServerPort As Integer, _
ByVal sUserName As String, _
ByVal sPassword As String, _
ByVal lService As Long, _
ByVal lFlags As Long, _
ByVal lContext As Long) As Long

Declare Function InternetOpen Lib "wininet.dll" _
Alias "InternetOpenA" ( _
ByVal sAgent As String, _
ByVal lAccessType As Long, _
ByVal sProxyName As String, _
ByVal sProxyBypass As String, _
ByVal lFlags As Long) As Long

Declare Function FtpSetCurrentDirectory Lib "wininet.dll" _
Alias "FtpSetCurrentDirectoryA" ( _
ByVal hFtpSession As Long, _
ByVal lpszDirectory As String) As Boolean

Declare Function FtpGetCurrentDirectory Lib "wininet.dll" _
Alias "FtpGetCurrentDirectoryA" ( _
ByVal hFtpSession As Long, _
ByVal lpszCurrentDirectory As String, _
lpdwCurrentDirectory As Long) As Long

Declare Function FtpCreateDirectory Lib "wininet.dll" _
Alias "FtpCreateDirectoryA" ( _
ByVal hFtpSession As Long, _
ByVal lpszDirectory As String) As Boolean

Declare Function FtpRemoveDirectory Lib "wininet.dll" _
Alias "FtpRemoveDirectoryA" ( _
ByVal hFtpSession As Long, _
ByVal lpszDirectory As String) As Boolean

Declare Function FtpDeleteFile Lib "wininet.dll" _
Alias "FtpDeleteFileA" ( _
ByVal hFtpSession As Long, _
ByVal lpszFileName As String) As Boolean

Declare Function FtpRenameFile Lib "wininet.dll" _
Alias "FtpRenameFileA" ( _
ByVal hFtpSession As Long, _
ByVal lpszExisting As String, _
ByVal lpszNew As String) As Boolean

Declare Function FtpGetFile Lib "wininet.dll" _
Alias "FtpGetFileA" ( _
ByVal hConnect As Long, _
ByVal lpszRemoteFile As String, _
ByVal lpszNewFile As String, _
ByVal fFailIfExists As Long, _
ByVal dwFlagsAndAttributes As Long, _
ByVal dwFlags As Long, _
ByRef dwContext As Long) As Boolean

Declare Function FtpGetFileSize Lib "wininet.dll" ( _
ByVal hFile As Long, _
ByRef FileSizeHigh As Long) As Long

'Declare Function FtpGetFileSize Lib "wininet.dll" _
' Alias "FtpGetFileSizeA" ( _
' ByVal hFile As Long, _
' ByRef lpdwFileSizeHigh As Long) As Long

Declare Function FtpOpenFile Lib "wininet.dll" _
Alias "FtpOpenFileA" ( _
ByVal hConnect As Long, _
ByVal lpszFileName As String, _
ByVal dwAccess As Long, _
ByVal dwFlags As Long, _
ByRef dwContext As Long) As Long

Declare Function FtpPutFile Lib "wininet.dll" _
Alias "FtpPutFileA" ( _
ByVal hConnect As Long, _
ByVal lpszLocalFile As String, _
ByVal lpszNewRemoteFile As String, _
ByVal dwFlags As Long, _
ByVal dwContext As Long) As Boolean

Declare Function InternetGetLastResponseInfo Lib "wininet.dll" _
Alias "InternetGetLastResponseInfoA" ( _
lpdwError As Long, _
ByVal lpszBuffer As String, _
lpdwBufferLength As Long) As Boolean

Declare Function FtpFindFirstFile Lib "wininet.dll" _
Alias "FtpFindFirstFileA" ( _
ByVal hFtpSession As Long, _
ByVal lpszSearchFile As String, _
lpFindFileData As WIN32_FIND_DATA, _
ByVal dwFlags As Long, _
ByVal dwContent As Long) As Long

Declare Function InternetFindNextFile Lib "wininet.dll" _
Alias "InternetFindNextFileA" ( _
ByVal hFind As Long, _
lpvFindData As WIN32_FIND_DATA) As Long

Private Const PassiveConnection As Boolean = True
Private Const ERROR_NO_MORE_FILES = 18&

Public Sub EnumFiles(hConnection As Long)
Dim pData As WIN32_FIND_DATA, hFind As Long, lRet As Long
'// set the graphics mode to persistent
'Me.AutoRedraw = True
'// create a buffer
pData.cFileName = String(MAX_PATH, 0)
'// find the first file
hFind = FtpFindFirstFile(hConnection, "*.*", pData, 0, 0)
'// if there's no file, then exit sub
If hFind = 0 Then Exit Sub
'// show the filename
MsgBox Left(pData.cFileName, InStr(1, pData.cFileName, _
String(1, 0), vbBinaryCompare) - 1)
Do
'// create a buffer
pData.cFileName = String(MAX_PATH, 0)
'// find the next file
lRet = InternetFindNextFile(hFind, pData)
'// if there's no next file, exit do
If lRet = 0 Then Exit Do
'// show the filename
MsgBox Left(pData.cFileName, InStr(1, pData.cFileName, _
String(1, 0), vbBinaryCompare) - 1)
Loop
'// close the search handle
InternetCloseHandle hFind
End Sub

Sub ShowError()
Dim lErr As Long, sErr As String, lenBuf As Long
'// get the required buffer size
InternetGetLastResponseInfo lErr, sErr, lenBuf
'// create a buffer
sErr = String(lenBuf, 0)
'// retrieve the last respons info
InternetGetLastResponseInfo lErr, sErr, lenBuf
'// show the last response info
MsgBox "Error " & CStr(lErr) & ": " & sErr, vbOKOnly + vbCritical
End Sub

Function FTP_Put_File(Server As String, _
Logon As String, _
Password As String, _
Source As String, _
Target As String, _
Mode As Long) _
As Long
Dim hConnection As Long, hOpen As Long, hFile As Long, sOrgPath
As String
Dim lLowSize As Long, lHighSize As Long, lSize As Long
'// open an internet connection
hOpen = InternetOpen("Excel Spreadsheet Source Management", _
INTERNET_OPEN_TYPE_PRECONFIG, _
vbNullString, _
vbNullString, _
0)
'// connect to the FTP server
hConnection = InternetConnect(hOpen, _
Server, _
INTERNET_DEFAULT_FTP_PORT, _
Logon, _
Password, _
INTERNET_SERVICE_FTP, _
IIf(PassiveConnection,
INTERNET_FLAG_PASSIVE, 0), _
0)
'// upload the file
FTP_Put_File = FtpPutFile(hConnection, Source, Target, Mode, 0)
If FTP_Put_File Then
'// check the file size
hFile = FtpOpenFile(hConnection, Target, GENERIC_READ, Mode,
0)
lLowSize = FtpGetFileSize(hFile, lHighSize)
lSize = lLowSize
FTP_Put_File = lSize
Else
FTP_Put_File = -1
End If
'// close the FTP connection
InternetCloseHandle hConnection
'// close the internet connection
InternetCloseHandle hOpen
End Function

Function FTP_Get_File(Server As String, _
Logon As String, _
Password As String, _
Source As String, _
Target As String, _
Mode As Long) _
As Long
Dim hConnection As Long, hOpen As Long, hFile As Long, sOrgPath
As String
Dim lLowSize As Long, lHighSize As Long, lSize As Long
'// open an internet connection
hOpen = InternetOpen("Excel Spreadsheet Source Management", _
INTERNET_OPEN_TYPE_PRECONFIG, _
vbNullString, _
vbNullString, _
0)
'// connect to the FTP server
hConnection = InternetConnect(hOpen, _
Server, _
INTERNET_DEFAULT_FTP_PORT, _
Logon, _
Password, _
INTERNET_SERVICE_FTP, _
IIf(PassiveConnection,
INTERNET_FLAG_PASSIVE, 0), _
0)
'// check the file size
hFile = FtpOpenFile(hConnection, Source, GENERIC_READ, Mode, 0)
lLowSize = FtpGetFileSize(hFile, lHighSize)
lSize = lLowSize
'// upload the file
FTP_Get_File = FtpGetFile(hConnection, Source, Target, Mode, 0)
'// close the FTP connection
InternetCloseHandle hConnection
'// close the internet connection
InternetCloseHandle hOpen
If FTP_Get_File Then
FTP_Get_File = lSize
Else
FTP_Get_File = -1
End If
End Function