如何更改 WebBrowser 的代理？答案

【问题标题】：How to change the proxy of the WebBrowser?如何更改 WebBrowser 的代理？
【发布时间】：2012-08-14 14:19:16
【问题描述】：

我所说的 webbrowser 是指在 VB 中创建的对象，而不是 chrome 或 IE。如何更改浏览器用于浏览页面的代理？

【问题讨论】：

【解决方案1】：

我在互联网上用 C# 找到了你的问题的解决方案，所以这是我可以推荐的 VB 版本。只需确保导入 System.Runtime.InteropServices。

<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 Structure Struct_INTERNET_PROXY_INFO
                        Public dwAccessType As Integer
                        Public proxy As IntPtr
                        Public proxyBypass As IntPtr
                End Structure

                Private Sub RefreshIESettings(ByVal strProxy As String)
                        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, System.Runtime.InteropServices.Marshal.SizeOf(struct_IPI))
     End Sub

【讨论】：