使用WebBrowser控件设置和取消代理的问题。

[tudouding]

我用下面的方法实现了设置代理，但是用什么方法能够取消所设置的代理呢？

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);

public void RefreshIESettings(string strProxy)
{

const int INTERNET_OPTION_PROXY = 38;
const int INTERNET_OPEN_TYPE_PROXY = 3;

Struct_INTERNET_PROXY_INFO struct_IPI;


struct_IPI.dwAccessType = INTERNET_OPEN_TYPE_PROXY;
struct_IPI.proxy = Marshal.StringToHGlobalAnsi(strProxy);
struct_IPI.proxyBypass = Marshal.StringToHGlobalAnsi("local");

IntPtr intptrStruct = Marshal.AllocCoTaskMem(Marshal.SizeOf(struct_IPI));

Marshal.StructureToPtr(struct_IPI, intptrStruct, true);

bool iReturn = InternetSetOption(IntPtr.Zero, INTERNET_OPTION_PROXY, intptrStruct, Marshal.SizeOf(struct_IPI));


}

private void button5_Click(object sender, EventArgs e)
{
RefreshIESettings(this.getIPStr());
string url = "http://www.google.cn";
webBrowser1.Navigate(url,null,null,null);
}


高分求WebBrowser取消代理的方法。

[蒋晟]

> Как для TWebBrowser пpогpаммно по несколько pаз менять адpес и поpт
> пpокси-сеpвеpа во вpемя соединения ???
> Чеpез NMHTTP тоже никак не получается.


var
dreserved:dword;
x:dword;
p : INTERNET_PROXY_INFO;
begin
/
p.dwAccessType := ........;
p.lpszProxyBypass := .....;
p.lpszProxy := ......;
x := sizeof(p);
dreserved := 0;
if UrlMkSetSessionOption({INTERNET_OPTION_REFRESH}
INTERNET_OPTION_PROXY,@p,x,dreserved)<>S_Ok
then begin
....
end;

[netstray]

帮你顶一下

[liherun]

学习，没有用过这个控件

[宝_爸]

下面的代码来自http://www.codeproject.com/KB/IP/changeproxy1.aspx
虽然是C++的，但是你能看到如何使用InternetSetOption 取消代理。

BOOL DisableConnectionProxy(LPCTSTR conn_name)
{
    //conn_name: active connection name. 
    INTERNET_PER_CONN_OPTION_LIST list;
    BOOL    bReturn;
    DWORD   dwBufSize = sizeof(list);
    // Fill out list struct.
    list.dwSize = sizeof(list);
    // NULL == LAN, otherwise connectoid name.
    list.pszConnection = conn_name;
    // Set three options.
    list.dwOptionCount = 1;
    list.pOptions = new INTERNET_PER_CONN_OPTION[list.dwOptionCount];
    // Make sure the memory was allocated.
    if(NULL == list.pOptions)
    {
        // Return FALSE if the memory wasn't allocated.
        OutputDebugString("failed to allocat memory in DisableConnectionProxy()");
        return FALSE;
    }
    // Set flags.
    list.pOptions[0].dwOption = INTERNET_PER_CONN_FLAGS;
    list.pOptions[0].Value.dwValue = PROXY_TYPE_DIRECT  ;
    // Set the options on the connection.
    bReturn = InternetSetOption(NULL,
        INTERNET_OPTION_PER_CONNECTION_OPTION, &list, dwBufSize);
    // Free the allocated memory.
    delete [] list.pOptions;
    InternetSetOption(NULL, INTERNET_OPTION_SETTINGS_CHANGED, NULL, 0);
    InternetSetOption(NULL, INTERNET_OPTION_REFRESH , NULL, 0);
    return bReturn;
}

[tudouding]

2楼和4楼的代码看不懂呀，能注释一下吗？？

[zhyale]

顶 。
同样的问题，希望有C#的实现。

[zhyale]

在 RefreshIESetting 里面添加：
const int INTERNET_OPEN_TYPE_DIRECT = 1;

struct_IPI.dwAccessType 的赋值修改为：
if (String.IsNullOrEmpty(strProxy)) struct_IPI.dwAccessType = INTERNET_OPEN_TYPE_DIRECT;
else struct_IPI.dwAccessType = INTERNET_OPEN_TYPE_PROXY;
其它不用修改，只要strProxy为空（""），即取消Proxy 。

已测试通过。