设置系统代理

Question

我在哪里可以找到用于设置系统代理的Visual Basic .NET方法。

我想设置代理服务器上的检查。然后将系统代理设置为该代理服务器。

我似乎无法找到任何有关这样做的信息。

Answer 1

Did you check​​3210？

它涵盖了更改应用程序的全局代理以及更改系统设置。

Answer 2

以下类将设置系统代理。我没有写我自己，并且不能为我的生活记得在那里我发现它：

Imports System 
Imports System.Runtime.InteropServices 


Public Class IEProxy 

Public Enum Options 

    INTERNET_PER_CONN_FLAGS = 1 

    INTERNET_PER_CONN_PROXY_SERVER = 2 

    INTERNET_PER_CONN_PROXY_BYPASS = 3 

    INTERNET_PER_CONN_AUTOCONFIG_URL = 4 

    INTERNET_PER_CONN_AUTODISCOVERY_FLAGS = 5 

    INTERNET_OPTION_REFRESH = 37 

    INTERNET_OPTION_PER_CONNECTION_OPTION = 75 

    INTERNET_OPTION_SETTINGS_CHANGED = 39 

    PROXY_TYPE_PROXY = &H2 

    PROXY_TYPE_DIRECT = &H1 

End Enum 


<StructLayout(LayoutKind.Sequential)> _ 
Private Class FILETIME 

    Public dwLowDateTime As Integer 

    Public dwHighDateTime As Integer 

End Class 


<StructLayout(LayoutKind.Explicit, Size:=12)> _ 
Private Structure INTERNET_PER_CONN_OPTION 

    <FieldOffset(0)> Dim dwOption As Integer 

    <FieldOffset(4)> Dim dwValue As Integer 

    <FieldOffset(4)> Dim pszValue As IntPtr 

    <FieldOffset(4)> Dim ftValue As IntPtr 


    Public Function GetBytes() As Byte() 

     Dim b(12) As Byte 

     BitConverter.GetBytes(dwOption).CopyTo(b, 0) 

     Select Case dwOption 

      Case (Options.INTERNET_PER_CONN_FLAGS) 

       BitConverter.GetBytes(dwValue).CopyTo(b, 4) 

      Case (Options.INTERNET_PER_CONN_PROXY_BYPASS) 

       BitConverter.GetBytes(pszValue.ToInt32()).CopyTo(b, 4) 

      Case (Options.INTERNET_PER_CONN_PROXY_SERVER) 

       BitConverter.GetBytes(pszValue.ToInt32()).CopyTo(b, 4) 

     End Select 

     Return (b) 

    End Function 

End Structure 


<StructLayout(LayoutKind.Sequential, CharSet:=CharSet.Auto)> _ 
Private Class INTERNET_PER_CONN_OPTION_LIST 

    Public dwSize As Integer 

    Public pszConnection As String 

    Public dwOptionCount As Integer 

    Public dwOptionError As Integer 

    Public pOptions As IntPtr 

End Class 

<StructLayout(LayoutKind.Sequential)> _ 
Private Class INTERNET_PROXY_INFO 

    Public dwAccessType As Integer 

    Public lpszProxy As IntPtr 

    Public lpszProxyBypass As IntPtr 

End Class 


Private Const ERROR_INSUFFICIENT_BUFFER = 122 

Private Const INTERNET_OPTION_PROXY = 38 

Private Const INTERNET_OPEN_TYPE_DIRECT = 1 


<DllImport("wininet.dll")> _ 
Private Shared Function InternetSetOption(ByVal hInternet As IntPtr, _ 
       ByVal dwOption As Integer, _ 
       ByVal lpBuffer As INTERNET_PER_CONN_OPTION_LIST, _ 
       ByVal dwBufferLength As Integer) As Boolean 

End Function 


<DllImport("kernel32.dll")> _ 
Private Shared Function GetLastError() As Integer 

End Function 


Public Function SetProxy(ByVal proxy_full_addr As String) As Boolean 

    Dim bReturn As Boolean 

    Dim list As New INTERNET_PER_CONN_OPTION_LIST 

    Dim dwBufSize As Integer = Marshal.SizeOf(list) 

    Dim opts(3) As INTERNET_PER_CONN_OPTION 

    Dim opt_size As Integer = Marshal.SizeOf(opts(0)) 


    list.dwSize = dwBufSize 

    list.pszConnection = ControlChars.NullChar 

    list.dwOptionCount = 3 


    'set flags 

    opts(0).dwOption = Options.INTERNET_PER_CONN_FLAGS 

    opts(0).dwValue = Options.PROXY_TYPE_DIRECT Or Options.PROXY_TYPE_PROXY 


    'set proxyname 

    opts(1).dwOption = Options.INTERNET_PER_CONN_PROXY_SERVER 

    opts(1).pszValue = Marshal.StringToHGlobalAnsi(proxy_full_addr) 


    'set override 

    opts(2).dwOption = Options.INTERNET_PER_CONN_PROXY_BYPASS 

    opts(2).pszValue = Marshal.StringToHGlobalAnsi("local") 


    Dim b(3 * opt_size) As Byte 

    opts(0).GetBytes().CopyTo(b, 0) 

    opts(1).GetBytes().CopyTo(b, opt_size) 

    opts(2).GetBytes().CopyTo(b, 2 * opt_size) 


    Dim ptr As IntPtr = Marshal.AllocCoTaskMem(3 * opt_size) 

    Marshal.Copy(b, 0, ptr, 3 * opt_size) 


    list.pOptions = ptr 

    'Set the options on the connection 

    bReturn = InternetSetOption(IntPtr.Zero, Options.INTERNET_OPTION_PER_CONNECTION_OPTION, list, dwBufSize) 

    If Not bReturn Then 

     Debug.WriteLine(GetLastError) 

    End If 


    'Notify existing Internet Explorer instances that the settings have changed 

    bReturn = InternetSetOption(IntPtr.Zero, Options.INTERNET_OPTION_SETTINGS_CHANGED, Nothing, 0) 

    If Not bReturn Then 

     Debug.WriteLine(GetLastError) 

    End If 


    'Flush the current IE proxy setting 

    bReturn = InternetSetOption(IntPtr.Zero, Options.INTERNET_OPTION_REFRESH, Nothing, 0) 

    If Not bReturn Then 

     Debug.WriteLine(GetLastError) 

    End If 


    Marshal.FreeHGlobal(opts(1).pszValue) 

    Marshal.FreeHGlobal(opts(2).pszValue) 

    Marshal.FreeCoTaskMem(ptr) 

    Return (bReturn) 

End Function 


Public Function DisableProxy() As Boolean 

    Dim bReturn As Boolean 

    Dim list As New INTERNET_PER_CONN_OPTION_LIST 

    Dim dwBufSize As Integer = Marshal.SizeOf(list) 

    Dim opts(0) As INTERNET_PER_CONN_OPTION 

    Dim opt_size As Integer = Marshal.SizeOf(opts(0)) 


    list.dwSize = dwBufSize 

    list.pszConnection = ControlChars.NullChar 

    list.dwOptionCount = 1 


    opts(0).dwOption = Options.INTERNET_PER_CONN_FLAGS 

    opts(0).dwValue = Options.PROXY_TYPE_DIRECT 


    Dim b(opt_size) As Byte 

    opts(0).GetBytes().CopyTo(b, 0) 


    Dim ptr As IntPtr = Marshal.AllocCoTaskMem(opt_size) 

    Marshal.Copy(b, 0, ptr, opt_size) 


    list.pOptions = ptr 

    'Set the options on the connection 

    bReturn = InternetSetOption(IntPtr.Zero, Options.INTERNET_OPTION_PER_CONNECTION_OPTION, list, dwBufSize) 

    If Not bReturn Then 

     Debug.WriteLine(GetLastError) 

    End If 


    'Notify existing Internet Explorer instances that the settings have changed 

    bReturn = InternetSetOption(IntPtr.Zero, Options.INTERNET_OPTION_SETTINGS_CHANGED, Nothing, 0) 

    If Not bReturn Then 

     Debug.WriteLine(GetLastError) 

    End If 


    'Flush the current IE proxy setting 

    bReturn = InternetSetOption(IntPtr.Zero, Options.INTERNET_OPTION_REFRESH, Nothing, 0) 

    If Not bReturn Then 

     Debug.WriteLine(GetLastError) 

    End If 


    Marshal.FreeCoTaskMem(ptr) 

    Return (bReturn) 

End Function 


End Class 

使用：

Dim sProxy As New IEProxy 
'set 
sProxy.SetProxy("123.2.2.123:8080") 'Returns True if successful 
'disable 
sProxy.DisableProxy 'Returns True if successful