c# - 异步可插拔协议(protocol)

使用this作为参考，我试图创建一个异步可插入协议，该协议仅对我的应用临时可用（并且未在系统范围内注册）。我正在使用CoInternetGetSession，然后调用RegisterNameSpace来完成。但是，当我调用RegisterNameSpace时，出现AccessViolation异常：Attempting to read or write protected memory。

知道发生了什么吗？

我的代码如下所示：

[ComImport]
[InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
[Guid("00000001-0000-0000-C000-000000000046")]
[ComVisible(true)]
public interface IClassFactory
{
    void CreateInstance(IntPtr pUnkOuter, ref Guid riid, out IntPtr ppvObject);
    void LockServer(bool fLock);
}

/* Custom class to act as a class factory that create's an instance of the protocol */
[Guid("0b9c4422-2b6e-4c2d-91b0-9016053ab1b1")]
[ComVisible(true),ClassInterface(ClassInterfaceType.AutoDispatch)]
public class PluggableProtocolFactory : IClassFactory
{
    public Type AppType;
    public PluggableProtocolFactory(Type t)
    {
        this.AppType = t;
    }
    public void CreateInstance(IntPtr pUnkOuter, ref Guid riid, out IntPtr ppvObject)
    {
        riid = ProtocolSupport.GetGuid(this.AppType);
        IInternetProtocol p = Activator.CreateInstance(this.AppType) as IInternetProtocol;
        ppvObject = Marshal.GetComInterfaceForObject(p, typeof(IInternetProtocol));
    }

    public void LockServer(bool fLock)
    {
        var b = fLock;
    }

}

[ComVisible(true)]
[ComImport]
[InterfaceType(ComInterfaceType.InterfaceIsIDispatch)]
[Guid("79eac9e7-baf9-11ce-8c82-00aa004ba90b")]
public interface IInternetSession
{
    void CreateBinding(); // Not Implemented
    void GetCache(); // Not Implemented
    void GetSessionOption(); // Not Implemented
    void RegisterMimeFilter([MarshalAs(UnmanagedType.Interface)] IClassFactory pCF, ref Guid rclsid, [MarshalAs(UnmanagedType.LPWStr)] string pwzType);
    void RegisterNameSpace([MarshalAs(UnmanagedType.Interface)] IClassFactory pCF, ref Guid rclsid, [MarshalAs(UnmanagedType.LPWStr)] string pwzProtocol,
                           UInt32 cPatterns, [MarshalAs(UnmanagedType.LPArray,ArraySubType=UnmanagedType.LPWStr)] string[] ppwzPatterns, UInt32 dwReserved);
    void SetCache(); // Not Implemented
    void SetSessionOption(); // Not Implemented
    void UnregisterMimeFilter(IClassFactory pCF, [MarshalAs(UnmanagedType.LPWStr)] string pwzType);
    void UnregisterNameSpace(IClassFactory pCF, [MarshalAs(UnmanagedType.LPWStr)] string pwzProtocol);
}

[ComVisible(false)] public interface IComRegister
{
    void Register(Type t);
    void Unregister(Type t);
}

[ComVisible(false), AttributeUsage(AttributeTargets.Class, AllowMultiple=true) ]
public class AsyncProtocolAttribute : Attribute, IComRegister
{
    public string Name;
    public string Description;

    [DllImport("urlmon.dll",PreserveSig=false)]
    public static extern int CoInternetGetSession(UInt32 dwSessionMode /* = 0 */, ref IInternetSession ppIInternetSession, UInt32 dwReserved /* = 0 */);

    public void Register(Type t)
    {
        IInternetSession session = null;
        CoInternetGetSession(0, ref session, 0);
        Guid g = new Guid("79EAC9E4-BAF9-11CE-8C82-00AA004BA90B");
        session.RegisterNameSpace(new PluggableProtocolFactory(t), ref g, this.Name, 0, null, 0);

    }

PluggableProtocolFactory中的CreateInstance方法永远不会被调用。 （一个断点永远不会被命中），所以RegisterNameSpace方法内部发生了其他事情。

我尝试以管理员和普通用户身份运行。两种情况下都存在相同的错误。

最佳答案

您在RegisterNameSpace方法中而不是CreateInstance方法中调用PluggableProtocolFactory的构造函数。我认为这就是您的问题所在，永远不会创建IInternetProtocol实例来传递给您的方法。