webbrowser代理c#代碼實現

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微軟webbrowser控制項也就是IE外掛程式，他的所有功能就像IE類似，當然設定也是一樣的，下面介紹下webbrowser如何設定代理，可不要用這個對抗廣告聯盟哦

You can change the proxy with InternetSetOption method from the wininet.dll, here is a example to set the proxy:

using System.Runtime.InteropServices;

Public struct Struct_INTERNET_PROXY_INFO 
{ 
public int dwAccessType; 
public IntPtr proxy; 
public IntPtr proxyBypass; 
}; 
[DllImport("wininet.dll", SetLastError = true)] 
private static extern bool InternetSetOption(IntPtr hInternet, int dwOption, IntPtr lpBuffer, int lpdwBufferLength); 
private void RefreshIESettings(string strProxy) 
{ 
const int INTERNET_OPTION_PROXY = 38; 
const int INTERNET_OPEN_TYPE_PROXY = 3; 
Struct_INTERNET_PROXY_INFO struct_IPI; 
// Filling in structure 
struct_IPI.dwAccessType = INTERNET_OPEN_TYPE_PROXY; 
struct_IPI.proxy = Marshal.StringToHGlobalAnsi(strProxy); 
struct_IPI.proxyBypass = Marshal.StringToHGlobalAnsi("local"); 
// Allocating memory 
IntPtr intptrStruct = Marshal.AllocCoTaskMem(Marshal.SizeOf(struct_IPI)); 
// Converting structure to IntPtr 
Marshal.StructureToPtr(struct_IPI, intptrStruct, true); 
bool iReturn = InternetSetOption(IntPtr.Zero, INTERNET_OPTION_PROXY, intptrStruct, Marshal.SizeOf(struct_IPI)); 
} 
private void SomeFunc() 
{ 
RefreshIESettings("192.168.1.200:1010"); 
System.Object nullObject = 0; 
string strTemp = String.Empty; 
System.Object nullObjStr = strTemp; 
axWebBrowser1.Navigate("http://willstay.tripod.com", ref nullObject, ref nullObjStr, ref nullObjStr, ref nullObjStr); 
}

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昨 天做的投票機遇到個新問題，昨天開始那個投票開始現在ip地址，每個地址只能投5票/天。如果每次更改ie的串連為Proxy 伺服器，那也麻煩死了，如 果改用webclient，那昨天的2個多小時就白費了，上網一通狂收還真找到了辦法，這下好辦了，建了一個proxy.txt文檔，裡面放上從網上收到 的Proxy 伺服器，然後程式讀到一個listbox裡面，每次需要更換ip的時候只要單擊一次，就可以還一個地址重新投票了。 
附上proxy.cs 

using System.Runtime.InteropServices;//需要添加這個引用 
public struct Struct_INTERNET_PROXY_INFO 
{ 
public int dwAccessType; 
public IntPtr proxy; 
public IntPtr proxyBypass; 
}; 
[DllImport("wininet.dll", SetLastError = true)] 
private static extern bool InternetSetOption(IntPtr hInternet, int dwOption, IntPtr lpBuffer, int lpdwBufferLength); 
public void RefreshIESettings(string strProxy) 
{ 
const int INTERNET_OPTION_PROXY = 38; 
const int INTERNET_OPEN_TYPE_PROXY = 3; 
Struct_INTERNET_PROXY_INFO struct_IPI; 
// Filling in structure 
struct_IPI.dwAccessType = INTERNET_OPEN_TYPE_PROXY; 
struct_IPI.proxy = Marshal.StringToHGlobalAnsi(strProxy); 
struct_IPI.proxyBypass = Marshal.StringToHGlobalAnsi(”local”); 
// Allocating memory 
IntPtr intptrStruct = Marshal.AllocCoTaskMem(Marshal.SizeOf(struct_IPI)); 
// Converting structure to IntPtr 
Marshal.StructureToPtr(struct_IPI, intptrStruct, true); 
bool iReturn = InternetSetOption(IntPtr.Zero, INTERNET_OPTION_PROXY, intptrStruct, Marshal.SizeOf(struct_IPI)); 
}

使用的時候，調用RefreshIESettings 
py.proxy py1 = new proxy(); 
py1.RefreshIESettings(”221.4.155.51:3128″); 

webBrowser1.Navigate(”http://www.hfxsy.cn”, null, null, null);