WebBrowser 的代理伺服器 ( Proxy ) 設定

上次介紹過，如何使用 WebClient 設定 Proxy，這次要教大家如何使用 WebBrowser 控制項設定 Proxy，複製以下程式碼 (記得 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));
}

接著在視窗讀取 ( Form1_Load ) 時，要如此呼叫

private void Form1_Load(object sender, EventArgs e)
{
    RefreshIESettings("216.59.17.116:8080");
    webBrowser1.Navigate("http://www.google.com.tw/");
}

執行後，如果要驗證是否為代理伺服器進入 http://www.google.com.tw/，就可在搜尋引擎上鍵入 "What is my ip"，找到 http://www.whatismyip.com/，點擊進去，就會看到自己目前的 ip，而我這範例執行後，畫面如下如此一來設定完成，收工。

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