设置IE代理

#Region "改变代理"
Private Structure Struct_INTERNET_PROXY_INFO
Public dwAccessType As Integer
Public proxy As IntPtr
Public proxyBypass As IntPtr
End Structure

<Runtime.InteropServices.DllImport("wininet.dll", SetLastError:=True)> _
Private Shared Function InternetSetOption(ByVal hInternet As IntPtr, ByVal dwOption As Integer, ByVal lpBuffer As IntPtr, ByVal lpdwBufferLength As Integer) As Boolean
End Function

Public Shared Sub SetProxy(Optional ByVal strProxy As String = "221.130.7.227:80")
Const INTERNET_OPTION_PROXY As Integer = 38
Const INTERNET_OPEN_TYPE_PROXY As Integer = 3

Dim struct_IPI As Struct_INTERNET_PROXY_INFO

' Filling in structure
struct_IPI.dwAccessType = INTERNET_OPEN_TYPE_PROXY
struct_IPI.proxy = Marshal.StringToHGlobalAnsi(strProxy)
struct_IPI.proxyBypass = Marshal.StringToHGlobalAnsi("local")

' Allocating memory
Dim intptrStruct As IntPtr = Marshal.AllocCoTaskMem(Marshal.SizeOf(struct_IPI))

' Converting structure to IntPtr
Marshal.StructureToPtr(struct_IPI, intptrStruct, True)

Dim iReturn As Boolean = InternetSetOption(IntPtr.Zero, INTERNET_OPTION_PROXY, intptrStruct, Marshal.SizeOf(struct_IPI))
End Sub
#End Region