请各位兄弟，版主，大家帮帮忙，谢谢了，有关操作FTP的API的问题。

52juanjuan 2004-09-27 03:27:10

我用的API操作FTP的时候，打开Interenet正常，为什么连接不上呢，用户名正确，密码正确，端口是21，服务是1，IP地址也正确。
API函数声明如下：
Public 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

'连接FTP操作
Public Declare Function InternetConnect Lib "wininet.dll" Alias "InternetConnectA" (ByVal hInternetSession As Long, ByVal sServerName As String, ByVal nServerPort As Long, ByVal sUsername As String, ByVal sPassword As String, ByVal lService As Long, _
ByVal lFlags As Long, ByVal lContext As Long) As Long

Public Function OpenInternet() As Boolean

hOpen = InternetOpen("ftpIn2english", INTERNET_OPEN_TYPE_PERCONFIG, vbNullString, vbNullString, 0&)
If hOpen = 0 Then
MsgBox "打开网络失败，网络不通"
OpenInternet = False
Else
OpenInternet = True
End If

End Function

Public Function OpenConnection() As Long
Dim temp As Long

If hConnection <> 0 Then
InternetCloseHandle hConnection
End If

temp = InternetConnect(hOpen, "ftpIn2english", 0, "fibona", "fibonaxiong", 1, 1, 0)

'hConnection = InternetConnect(hOpen, "202.205.174.12", 0, "fibona", "fibonaxiong", 1, 0, 0)
If temp <> 0 Then
OpenConnection = temp
Else
ErrorOut Err.LastDllError, "internet Connection"
OpenConnection = 0
Exit Function
End If

End Function

为什么temp的值是0，就是连不上主机呀，返回信息也没有，请各位指点一下。谢谢了

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dongge2000 2004-10-02

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Const FTP_TRANSFER_TYPE_UNKNOWN = &H0
Const FTP_TRANSFER_TYPE_ASCII = &H1
Const FTP_TRANSFER_TYPE_BINARY = &H2
Const INTERNET_DEFAULT_FTP_PORT = 21 ' default for FTP servers
Const INTERNET_SERVICE_FTP = 1
Const INTERNET_FLAG_PASSIVE = &H8000000 ' used for FTP connections
Const INTERNET_OPEN_TYPE_PRECONFIG = 0 ' use registry configuration
Const INTERNET_OPEN_TYPE_DIRECT = 1 ' direct to net
Const INTERNET_OPEN_TYPE_PROXY = 3 ' via named proxy
Const INTERNET_OPEN_TYPE_PRECONFIG_WITH_NO_AUTOPROXY = 4 ' prevent using java/script/INS
Const MAX_PATH = 260
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
Private Declare Function InternetCloseHandle Lib "wininet" (ByRef hInet As Long) As Long
Private 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
Private 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
Private Declare Function FtpSetCurrentDirectory Lib "wininet.dll" Alias "FtpSetCurrentDirectoryA" (ByVal hFtpSession As Long, ByVal lpszDirectory As String) As Boolean
Private Declare Function FtpGetCurrentDirectory Lib "wininet.dll" Alias "FtpGetCurrentDirectoryA" (ByVal hFtpSession As Long, ByVal lpszCurrentDirectory As String, lpdwCurrentDirectory As Long) As Long
Private Declare Function FtpCreateDirectory Lib "wininet.dll" Alias "FtpCreateDirectoryA" (ByVal hFtpSession As Long, ByVal lpszDirectory As String) As Boolean
Private Declare Function FtpRemoveDirectory Lib "wininet.dll" Alias "FtpRemoveDirectoryA" (ByVal hFtpSession As Long, ByVal lpszDirectory As String) As Boolean
Private Declare Function FtpDeleteFile Lib "wininet.dll" Alias "FtpDeleteFileA" (ByVal hFtpSession As Long, ByVal lpszFileName As String) As Boolean
Private Declare Function FtpRenameFile Lib "wininet.dll" Alias "FtpRenameFileA" (ByVal hFtpSession As Long, ByVal lpszExisting As String, ByVal lpszNew As String) As Boolean
Private 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
Private 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
Private Declare Function InternetGetLastResponseInfo Lib "wininet.dll" Alias "InternetGetLastResponseInfoA" (lpdwError As Long, ByVal lpszBuffer As String, lpdwBufferLength As Long) As Boolean
Private 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
Private Declare Function InternetFindNextFile Lib "wininet.dll" Alias "InternetFindNextFileA" (ByVal hFind As Long, lpvFindData As WIN32_FIND_DATA) As Long
Const PassiveConnection As Boolean = True
Private Sub Form_Load()
Dim hConnection As Long, hOpen As Long, sOrgPath As String
'open an internet connection
hOpen = InternetOpen("API-Guide sample program", INTERNET_OPEN_TYPE_PRECONFIG, vbNullString, vbNullString, 0)
'connect to the FTP server
hConnection = InternetConnect(hOpen, "your ftp server", INTERNET_DEFAULT_FTP_PORT, "your login", "your password", INTERNET_SERVICE_FTP, IIf(PassiveConnection, INTERNET_FLAG_PASSIVE, 0), 0)
'create a buffer to store the original directory
sOrgPath = String(MAX_PATH, 0)
'get the directory
FtpGetCurrentDirectory hConnection, sOrgPath, Len(sOrgPath)
'create a new directory 'testing'
FtpCreateDirectory hConnection, "testing"
'set the current directory to 'root/testing'
FtpSetCurrentDirectory hConnection, "testing"
'upload the file 'test.htm'
FtpPutFile hConnection, "C:\test.htm", "test.htm", FTP_TRANSFER_TYPE_UNKNOWN, 0
'rename 'test.htm' to 'apiguide.htm'
FtpRenameFile hConnection, "test.htm", "apiguide.htm"
'enumerate the file list from the current directory ('root/testing')
EnumFiles hConnection
'retrieve the file from the FTP server
FtpGetFile hConnection, "apiguide.htm", "c:\apiguide.htm", False, 0, FTP_TRANSFER_TYPE_UNKNOWN, 0
'delete the file from the FTP server
FtpDeleteFile hConnection, "apiguide.htm"
'set the current directory back to the root
FtpSetCurrentDirectory hConnection, sOrgPath
'remove the direcrtory 'testing'
FtpRemoveDirectory hConnection, "testing"
'close the FTP connection
InternetCloseHandle hConnection
'close the internet connection
InternetCloseHandle hOpen
End Sub
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
Me.Print 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
Me.Print 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

52juanjuan 2004-10-02