WinHttpGetProxyForUrl

[Malin]

Hi,

I'm developing an application which needs to get hold of the client's
proxysettings. In one case they are using a .pac-script.

With the following code, I manage to find the right proxy and everything
works just fine, but when I try to use the auto_detect options, (as can
be seen as comments) it returns error: 12180.

What I want to know is where is it looking for the .pac-script?

Thanks for all the help I can get!! /Malin

[DllImport("winh ttp.dll", SetLastError=tr ue, CharSet=CharSet .Unicode)]
private static extern bool WinHttpGetProxy ForUrl(
IntPtr http,
string url,
ref WINHTTP_AUTOPRO XY_OPTIONS options,
ref WINHTTP_PROXY_I NFO info);

[DllImport("winh ttp.dll", SetLastError=tr ue, CharSet=CharSet .Unicode)]
private static extern IntPtr WinHttpOpen(
string lpszAgent,
[MarshalAs(Unman agedType.U4)]
int dwAccessType,
IntPtr lpszProxy,
IntPtr lpszProxyBypass ,
[MarshalAs(Unman agedType.U4)]
int dwFlags);

[DllImport("winh ttp.dll", SetLastError=tr ue, CharSet=CharSet .Unicode)]
public static extern bool WinHttpCloseHan dle(
IntPtr hInternet);

[StructLayout(La youtKind.Sequen tial, CharSet=CharSet .Unicode)]
private struct WINHTTP_AUTOPRO XY_OPTIONS
{
[MarshalAs(Unman agedType.U4)]
public int dwFlags;
[MarshalAs(Unman agedType.U4)]
public int dwAutoDetectFla gs;
public string lpszAutoConfigU rl;
private IntPtr lpvReserved;
[MarshalAs(Unman agedType.U4)]
private int dwReserved;
public bool fAutoLoginIfCha llenged;
}

[StructLayout(La youtKind.Sequen tial, CharSet=CharSet .Unicode)]
private struct WINHTTP_PROXY_I NFO
{
[MarshalAs(Unman agedType.U4)]
private int dwAccessType;
public string lpszProxy;
private string lpszProxyBypass ;
}

private static WINHTTP_AUTOPRO XY_OPTIONS autoProxyOption s;
private static WINHTTP_PROXY_I NFO proxyInfo;
private static IntPtr sessionHandle;
private const int WINHTTP_AUTOPRO XY_AUTO_DETECT = 0x00000001;
private const int WINHTTP_AUTO_DE TECT_TYPE_DHCP = 0x00000001;
private const int WINHTTP_AUTO_DE TECT_TYPE_DNS_A = 0x00000002;
private const int WINHTTP_AUTOPRO XY_CONFIG_URL = 0x00000002;
private const int WINHTTP_ACCESS_ TYPE_NO_PROXY = 1;
private static IntPtr WINHTTP_NO_PROX Y_NAME = IntPtr.Zero;
private static IntPtr WINHTTP_NO_PROX Y_BYPASS = IntPtr.Zero;

public static string getDynamicProxy (string url)
{
bool valid = false;
string proxySetting = "";
autoProxyOption s = new WINHTTP_AUTOPRO XY_OPTIONS();
proxyInfo = new WINHTTP_PROXY_I NFO();
autoProxyOption s.dwFlags =
WINHTTP_AUTOPRO XY_CONFIG_URL;//WINHTTP_AUTOPRO XY_AUTO_DETECT;
autoProxyOption s.dwAutoDetectF lags = 0;
//(WINHTTP_AUTO_D ETECT_TYPE_DHCP |WINHTTP_AUTO_D ETECT_TYPE_DNS_ A);
autoProxyOption s.lpszAutoConfi gUrl = "http://localhost/proxy/proxy.pac";
autoProxyOption s.fAutoLoginIfC hallenged = true;
sessionHandle = WinHttpOpen("d& b On-line",
WINHTTP_ACCESS_ TYPE_NO_PROXY,
WINHTTP_NO_PROX Y_NAME,
WINHTTP_NO_PROX Y_BYPASS,
0);
valid = WinHttpGetProxy ForUrl(sessionH andle,url,ref autoProxyOption s,ref
proxyInfo);
System.Console. WriteLine("vali d : "+valid+", errorCode:
"+Marshal.GetLa stWin32Error()) ;
WinHttpCloseHan dle(sessionHand le);
if(valid)
proxySetting = proxyInfo.lpszP roxy;
return proxySetting;
}


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