/// <summary>
/// Invokes <c>InternetSetStatusCallback</c>, handling error conditions. Returns the wrapper for the delegate, which is actually passed to <c>InternetSetStatusCallback</c>.
/// </summary>
/// <param name="internet">The internet handle.</param>
/// <param name="callback">The internet status callback delegate, used to report progress.</param>
/// <returns>The wrapper created for <paramref name="callback"/>, which is actually passed to the unmanaged <c>InternetSetStatusCallback</c> function.</returns>
public static object InternetSetStatusCallback(SafeInternetHandle internet, InternetHandle.InternetCallback callback)
{
// Note: this will only work for synchronous callbacks! Asynchronous callbacks are not yet supported.
InternetStatusCallback ret = CreateInternetStatusCallback(callback);
if (DoInternetSetStatusCallback(internet, ret) == INTERNET_INVALID_STATUS_CALLBACK)
{
throw GetLastInternetException();
}
return(ret);
}
/// <summary>
/// Creates a wrapper for the provided internet status callback delegate.
/// </summary>
/// <param name="callback">The user-provided internet status callback delegate.</param>
/// <returns>The wrapped internet status callback delegate.</returns>
private static InternetStatusCallback CreateInternetStatusCallback(InternetHandle.InternetCallback callback)
{
if (callback == null)
{
return(null);
}
return((hInternet, dwContext, dwInternetStatus, lpvStatusInformation, dwStatusInformationLength) =>
{
InternetCallbackEventArgs args;
switch (dwInternetStatus)
{
default:
case InternetCallbackEventArgs.StatusCode.ClosingConnection:
case InternetCallbackEventArgs.StatusCode.ConnectionClosed:
case InternetCallbackEventArgs.StatusCode.DetectingProxy:
case InternetCallbackEventArgs.StatusCode.HandleClosing:
case InternetCallbackEventArgs.StatusCode.IntermediateResponse:
case InternetCallbackEventArgs.StatusCode.P3PHeader:
case InternetCallbackEventArgs.StatusCode.ReceivingResponse:
case InternetCallbackEventArgs.StatusCode.SendingRequest:
args = new InternetCallbackEventArgs
{
Code = dwInternetStatus,
RawData = lpvStatusInformation,
};
break;
case InternetCallbackEventArgs.StatusCode.ConnectedToServer:
case InternetCallbackEventArgs.StatusCode.ConnectingToServer:
SocketAddress socketAddress = new SocketAddress((AddressFamily)BitConverter.ToUInt16(lpvStatusInformation, 0), 16);
lpvStatusInformation.Select((x, i) => socketAddress[i] = x).Run();
args = new InternetCallbackEventArgs.Socket
{
Code = dwInternetStatus,
RawData = lpvStatusInformation,
EndPoint = new IPEndPoint(0, 0).Create(socketAddress),
};
break;
case InternetCallbackEventArgs.StatusCode.CookieHistory:
args = new InternetCallbackEventArgs.CookieHistory
{
Code = dwInternetStatus,
RawData = lpvStatusInformation,
Accepted = BitConverter.ToUInt32(lpvStatusInformation, 0) != 0,
Leashed = BitConverter.ToUInt32(lpvStatusInformation, 4) != 0,
Downgraded = BitConverter.ToUInt32(lpvStatusInformation, 8) != 0,
Rejected = BitConverter.ToUInt32(lpvStatusInformation, 12) != 0,
};
break;
case InternetCallbackEventArgs.StatusCode.CookieReceived:
case InternetCallbackEventArgs.StatusCode.CookieSent:
case InternetCallbackEventArgs.StatusCode.RequestSent:
case InternetCallbackEventArgs.StatusCode.ResponseReceived:
case InternetCallbackEventArgs.StatusCode.StateChange:
args = new InternetCallbackEventArgs.Number
{
Code = dwInternetStatus,
RawData = lpvStatusInformation,
Value = BitConverter.ToInt32(lpvStatusInformation, 0),
};
break;
case InternetCallbackEventArgs.StatusCode.HandleCreated:
case InternetCallbackEventArgs.StatusCode.RequestComplete:
IntPtr ptr = IntPtr.Size == 4 ? (IntPtr)BitConverter.ToUInt32(lpvStatusInformation, 0) : (IntPtr)BitConverter.ToUInt64(lpvStatusInformation, 0);
args = new InternetCallbackEventArgs.AsyncResult
{
Code = dwInternetStatus,
RawData = lpvStatusInformation,
Result = IntPtr.Size == 4 ? (IntPtr)Marshal.ReadInt32(ptr) : (IntPtr)Marshal.ReadInt64(ptr),
Error = IntPtr.Size == 4 ? Marshal.ReadInt32(ptr, 4) : Marshal.ReadInt32(ptr, 8),
};
break;
case InternetCallbackEventArgs.StatusCode.ResolvingName:
case InternetCallbackEventArgs.StatusCode.NameResolved:
case InternetCallbackEventArgs.StatusCode.Redirect:
args = new InternetCallbackEventArgs.String
{
Code = dwInternetStatus,
RawData = lpvStatusInformation,
Value = Encoding.Unicode.GetString(lpvStatusInformation),
};
break;
}
callback(args);
});
}