vb.net 2003 api 编程有关问题

vb.net 2003 api 编程问题
要实现的功能
1.将一个文件上传至FTP服务器上
2.查找FTP服务器当前目录下最旧的1个或几个文件
3.删除旧文件
查了好多资料   感觉用wininet.dll编写最简单了
不过我对API不怎么了解
谁能给个完整点的代码啊


------解决方案--------------------
给你段hook的代码吧，大了点，hoho，你学学api是怎么声明的，wininet.dll是个什么东东，不知道里面的声明


Imports System.Runtime.InteropServices

Public Class MyHook

'Hook键盘
Private Const WH_KEYBOARD As Integer = 2
'Hook返回值
Private hHook As Integer = 0
'定义引用变量防止CallbackOnCollectedDelegate错误的产生
Private HookProc As CallBack
'回调函数
Public Delegate Function CallBack(ByVal nCode As Integer, ByVal wParam As IntPtr, ByVal lParam As IntPtr) As Integer
'事件
Public Event KeyDown As System.Windows.Forms.KeyEventHandler
Public Event KeyUp As System.Windows.Forms.KeyEventHandler

'获取线程ID的API声明
<DllImport( "kernel32.dll ", CharSet:=CharSet.Auto, CallingConvention:=CallingConvention.StdCall)> _
Public Overloads Shared Function GetCurrentThreadId() As Integer
End Function

'设置Hook的API声明
<DllImport( "User32.dll ", CharSet:=CharSet.Auto, CallingConvention:=CallingConvention.StdCall)> _
Public Overloads Shared Function SetWindowsHookEx(ByVal idHook As Integer, ByVal HookProc As CallBack, ByVal hInstance As IntPtr, ByVal wParam As Integer) As Integer
End Function

'处理下一Hook的API声明
<DllImport( "User32.dll ", CharSet:=CharSet.Auto, CallingConvention:=CallingConvention.StdCall)> _
Public Overloads Shared Function CallNextHookEx(ByVal idHook As Integer, ByVal nCode As Integer, ByVal wParam As IntPtr, ByVal lParam As IntPtr) As Integer
End Function

'移除Hook的API声明
<DllImport( "User32.dll ", CharSet:=CharSet.Auto, CallingConvention:=CallingConvention.StdCall)> _
Public Overloads Shared Function UnhookWindowsHookEx(ByVal idHook As Integer) As Boolean
End Function

'安装Hook，类型键盘线程钩子，失败返回0，成功返回钩子句柄
Public Function SetHook() As Integer
HookProc = New CallBack(AddressOf KeyBoardProc)
hHook = SetWindowsHookEx(WH_KEYBOARD, HookProc, IntPtr.Zero, GetCurrentThreadId)
Return hHook
End Function

'钩子处理子程
Private Function KeyBoardProc(ByVal nCode As Integer, ByVal wParam As IntPtr, ByVal lParam As IntPtr) As Integer
If nCode = 0 Then
If lParam.ToInt32 > 0 Then
RaiseEvent KeyDown(Me, New Windows.Forms.KeyEventArgs(CType(wParam, Windows.Forms.Keys)))
End If
If lParam.ToInt32 < 0 Then
RaiseEvent KeyUp(Me, New Windows.Forms.KeyEventArgs(CType(wParam, Windows.Forms.Keys)))
End If
End If

Return CallNextHookEx(hHook, nCode, wParam, lParam)

End Function

'移除Hook，成功返回True，失败返回False
Public Function UnHook() As Boolean
Return UnhookWindowsHookEx(hHook)
End Function

End Class


------解决方案--------------------
studying
------解决方案--------------------
函数是完成功能的，首先你要知道wininet.dll是干什么的啊
------解决方案--------------------
确认ftp服务器是否允许下载
确认远程文件地址是否正确
确认ftp服务器是否支持ASCII模式
确认ie选项中被动模式是否勾选
确认是否有拦截软件（呵呵，没试过，谁知道有没有这么强功能的软件）
确认本地是否有创建文件的权限
确认本地文件名是否有问题，去掉d:\试一下
------解决方案--------------------