as the title I was wondering if there was a method to use different proxy on various WebBrowser simultaneously.
At first I tried to insert 5 WebBrowser and create 5 threads, and each performs this sub (which I found on the internet) to change proxy:
Public Structure Struct_INTERNET_PROXY_INFO
Public dwAccessType As Integer
Public proxy As IntPtr
Public proxyBypass As IntPtr
End Structure
Private Declare Auto Function InternetSetOption Lib "wininet.dll" (ByVal hInternet As IntPtr, ByVal dwOption As Integer, ByVal lpBuffer As IntPtr, ByVal lpdwBufferLength As Integer) As Boolean
Private Sub RefreshIESettings(ByVal strProxy As String)
Const INTERNET_OPTION_PROXY As Integer = 38
Const INTERNET_OPEN_TYPE_PROXY As Integer = 3
Dim s_IPI As Struct_INTERNET_PROXY_INFO
s_IPI.dwAccessType = INTERNET_OPEN_TYPE_PROXY
s_IPI.proxy = System.Runtime.InteropServices.Marshal.StringToHGlobalAnsi(strProxy)
s_IPI.proxyBypass = System.Runtime.InteropServices.Marshal.StringToHGlobalAnsi("Global")
Dim intptrStruct As IntPtr = System.Runtime.InteropServices.Marshal.AllocCoTaskMem(System.Runtime.InteropServices.Marshal.SizeOf(s_IPI))
System.Runtime.InteropServices.Marshal.StructureToPtr(s_IPI, intptrStruct, True)
InternetSetOption(IntPtr.Zero, INTERNET_OPTION_PROXY, intptrStruct, System.Runtime.InteropServices.Marshal.SizeOf(s_IPI))
End Sub
but it was a failure because the ip was found to be the same or in some cases were the same and 4 ip 1 different.
Related
hi i have a problem during navigate in webbrowser using private proxy
i can navigate with a public proxy with this script but i can't do this with proxy authentification (ip:port:user:pass)
''''''''''''''''''''''proxy'''''''''''''''''''''''
Friend Structure Struct_INTERNET_PROXY_INFO
Public dwAccessType As Integer
Public proxy As IntPtr
Public proxyBypass As IntPtr
End Structure
<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
Private Sub RefreshIESettings(ByVal strProxy As String)
Const INTERNET_OPTION_PROXY = 38
Const INTERNET_OPEN_TYPE_PROXY = 3
Dim struct_IPI As Struct_INTERNET_PROXY_INFO
struct_IPI.dwAccessType = INTERNET_OPEN_TYPE_PROXY
struct_IPI.proxy = Marshal.StringToHGlobalAnsi(strProxy)
struct_IPI.proxyBypass = Marshal.StringToHGlobalAnsi("local")
Dim intptrStruct = Marshal.AllocCoTaskMem(Marshal.SizeOf(struct_IPI))
Marshal.StructureToPtr(struct_IPI, intptrStruct, True)
Dim iReturn = InternetSetOption(IntPtr.Zero, INTERNET_OPTION_PROXY, intptrStruct, Marshal.SizeOf(struct_IPI))
End Sub
''''''''''''''''''''''End proxy'''''''''''''''''''''''*
any help please
It says marshal cannot be used, because it's protection level or the variable is been used before and it's been assigned to another value.
//code:
Imports System.Text.RegularExpressions
Imports System.Runtime.InteropServices
Public Class Form1
Dim int As Integer = 0
Public WithEvents Browser As WebBrowser
Public Declare Function GetAsyncKeyState Lib "user32.dll" (ByVal vKey As Int32) As UShort
#Region "Using Proxy"
<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
Public Sub UseProxy(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
Dim Marshal
struct_IPI.dwAccessType = INTERNET_OPEN_TYPE_PROXY
struct_IPI.proxy = Marshal.StringToHGlobalAnsi(strProxy)
struct_IPI.proxyBypass = Marshal.StringToHGlobalAnsi("local")
Dim intptrStruct As IntPtr = Marshal.AllocCoTaskMem(Marshal.SizeOf(struct_IPI))
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
#End Region
Marshal is a reserved word; you cannot give a variable this name. Remove the Dim Marshal statement.
I'm already using InternetSetOption and wininet to change the proxy settings for Internet Explorer which works since the webbrowser control uses it too, but how can I add it so that it can use authentication-required proxies (user:pass)?
Here's my code:
Public Structure Struct_INTERNET_PROXY_INFO
Public dwAccessType As Integer
Public proxy As IntPtr
Public proxyBypass As IntPtr
End Structure
Private Sub setProxy(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
struct_IPI.dwAccessType = INTERNET_OPEN_TYPE_PROXY
struct_IPI.proxy = Marshal.StringToHGlobalAnsi(strProxy)
struct_IPI.proxyBypass = Marshal.StringToHGlobalAnsi("local")
Dim intptrStruct As IntPtr = Marshal.AllocCoTaskMem(Marshal.SizeOf(struct_IPI))
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
Private Declare Auto Function InternetSetOption Lib "wininet.dll" (ByVal hInternet As IntPtr, ByVal dwOption As Integer, ByVal lpBuffer As IntPtr, ByVal lpdwBufferLength As Integer) As Boolean
And this is what I use whenever I want to change the proxy:
setProxy("ip:port")
So how can I add support for authentication?
My code using proxy works but when the proxy is invalid or restricted my program directly uses my IP address, i used a web browser that directly checks my ip, is there any way that i could set an exception whenever the proxy i used is invalid or restricted?
here is my working code:
Imports System.Runtime.InteropServices
#Region "Using Proxy"
<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 UseProxy(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
struct_IPI.dwAccessType = INTERNET_OPEN_TYPE_PROXY
struct_IPI.proxy = Marshal.StringToHGlobalAnsi(strProxy)
struct_IPI.proxyBypass = Marshal.StringToHGlobalAnsi("local")
Dim intptrStruct As IntPtr = Marshal.AllocCoTaskMem(Marshal.SizeOf(struct_IPI))
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
#End Region
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
UseProxy(ProxyText.Text)
WebBrowser1.Navigate("ipchicken.com")
End Sub
Try the solution below:
Another Stackoverflow Answer
I believe if you bind the address to that specific ip it wont work , if the ip is invalid or not working, and wont use your systems default.
OK, this problem has been bugging me for a long time.
I have the code for the service which communicates a string to the client via PostMessage:
Public Sub SendToClient(msgs As String, types As Integer, hwnd As Long)
postMessage(hwnd, 0, Nothing, msgs)
End Sub
Then I have the client that receives the string:
Protected Overrides Sub WndProc(ByRef m As System.Windows.Forms.Message)
If (m.Msg = 0) Then
Dim a as string
a = Marshal.PtrToStringAuto(m.LParam)
end if
MyBase.WndProc(m)
End Sub
However, the client sends an error, or some jumble of binary data or even just a blank string sometimes. By the way, the m.LParam is a number.
Can someone tell me what is the right way to send/receive strings via postmessage.
I do it like this:
Public Sub SendMessageToApp(ByVal NombreVentana As String, ByVal Mensaje As String, ByVal sender As Form)
Dim hWnd As IntPtr
Dim mCopyData As COPYDATASTRUCT
hWnd = CType(FindWindow(Nothing, NombreVentana), IntPtr)
Dim message As New System.Text.StringBuilder
If (CInt(hWnd) <> 0) Then
message.Append(Mensaje)
Dim pCopyData As IntPtr = Marshal.AllocHGlobal(message.Length() + 40)
mCopyData.lpData = Marshal.StringToHGlobalAnsi(message.ToString)
mCopyData.cbData = message.Length
mCopyData.dwData = CType(_messageID, IntPtr)
Marshal.StructureToPtr(mCopyData, pCopyData, False)
SendMessage(hWnd, WM_COPYDATA, CInt(sender.Handle), pCopyData)
Marshal.FreeHGlobal(mCopyData.lpData)
Marshal.FreeHGlobal(pCopyData)
End If
End Sub
Receiver window:
Declarations and definitions:
Const WM_COPYDATA As Integer = 74
Const SIG_LENGTH As Integer = 36
Const MAX_COPY_LENGTH As Integer = 128
Const SigConnect As String = "F7B82657-BD18-4ee6-B182-78721293821C"
Dim CDCount As Integer
Private Declare Function FindWindow Lib "user32" Alias "FindWindowA" _
(ByVal lpClassName As String, ByVal lpWindowName As String) As Integer
Private Declare Function SendMessage Lib "user32" Alias "SendMessageA" _
(ByVal hwnd As IntPtr, ByVal wMsg As Integer, ByVal wParam As Integer, _
ByVal lParam As IntPtr) As Integer
Dim hWndSender As Integer
Private Const _messageID As Integer = 10
'Estructura obligatoria para poder utilizar el API CopyData
<StructLayout(LayoutKind.Sequential)> _
Private Structure COPYDATASTRUCT
Public dwData As IntPtr
Public cbData As Integer
Public lpData As IntPtr
End Structure
Protected Overrides Sub WndProc(ByRef m As System.Windows.Forms.Message)
If m.Msg = WM_COPYDATA Then
Dim Estructura As COPYDATASTRUCT
Dim tipo As Type = Estructura.GetType
Dim message As String
Estructura = CType(m.GetLParam(GetType(COPYDATASTRUCT)), COPYDATASTRUCT)
'Here you get the message
message = Marshal.PtrToStringAnsi(Estructura.lpData, Estructura.cbData)
End If