C# 为webBrowser设置代理

http://blog.163.com/weipeng_yyp/blog/static/122478198201132223442853/

 

为webBrowser设置代理：

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)//strProxy为代理IP:端口

{

const int INTERNET_OPTION_PROXY = 38;

const int INTERNET_OPEN_TYPE_PROXY = 3;

const int INTERNET_OPEN_TYPE_DIRECT = 1;

 

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));

if (string.IsNullOrEmpty(strProxy) || strProxy.Trim().Length == 0)

{

strProxy = string.Empty;

struct_IPI.dwAccessType = INTERNET_OPEN_TYPE_DIRECT;

 

}

// 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：RefreshIESettings("xxx.xxx.xxx.xxx:xx");

 

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完美方法：
/*完整解析

public class IEProxy

{

private const int INTERNET_OPTION_PROXY = 38;

private const int INTERNET_OPEN_TYPE_PROXY = 3;

private const int INTERNET_OPEN_TYPE_DIRECT = 1;

 

private string ProxyStr;

 

 

[DllImport("wininet.dll", SetLastError = true)]

 

private static extern bool InternetSetOption(IntPtr hInternet, int dwOption, IntPtr lpBuffer, int lpdwBufferLength);

 

public struct Struct_INTERNET_PROXY_INFO

{

public int dwAccessType;

public IntPtr proxy;

public IntPtr proxyBypass;

}

 

private bool InternetSetOption(string strProxy)

{

int bufferLength;

IntPtr intptrStruct;

Struct_INTERNET_PROXY_INFO struct_IPI;

 

if (string.IsNullOrEmpty(strProxy) || strProxy.Trim().Length == 0)

{

strProxy = string.Empty;

struct_IPI.dwAccessType = INTERNET_OPEN_TYPE_DIRECT;

 

}

else

{

struct_IPI.dwAccessType = INTERNET_OPEN_TYPE_PROXY;

}

struct_IPI.proxy = Marshal.StringToHGlobalAnsi(strProxy);

struct_IPI.proxyBypass = Marshal.StringToHGlobalAnsi("local");

bufferLength = Marshal.SizeOf(struct_IPI);

intptrStruct = Marshal.AllocCoTaskMem(bufferLength);

Marshal.StructureToPtr(struct_IPI, intptrStruct, true);

return InternetSetOption(IntPtr.Zero, INTERNET_OPTION_PROXY, intptrStruct, bufferLength);

 

}

public IEProxy(string strProxy)

{

this.ProxyStr = strProxy;

}

//设置代理
public bool RefreshIESettings()

{

return InternetSetOption(this.ProxyStr);

}

//取消代理
public bool DisableIEProxy()

{

return InternetSetOption(string.Empty);

}

}

 

*/