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异步可插拔协议

interop com c#

HS. · 技术社区 · 16 年前

this 作为参考,我正在尝试创建一个异步可插拔协议,它只对我的应用程序暂时可用(而不是在系统范围内注册)。我正在使用 CoInternetGetSession 然后打电话 RegisterNameSpace 注册中间空间 我收到一个AccessViolation异常: Attempting to read or write protected memory

知道发生了什么吗?

[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);

    }

这个 CreateInstance PluggableProtocolFactory中的方法从未被调用(一个断点永远不会被击中)因此在这个断点内发生了其他事情 注册中间空间

我试着以管理员和普通用户的身份运行。两种情况下都有相同的错误。

2 回复 | 直到 16 年前

Tony The Lion 16 年前

HS. 16 年前

好的,我发现了:IInternetSession接口的声明是错误的:

这是一个更好的,我从 monoblog :

[ComVisible(true), Guid("79eac9e7-baf9-11ce-8c82-00aa004ba90b"),InterfaceTypeAttribute(ComInterfaceType.InterfaceIsIUnknown)]
public interface IInternetSession
{
    [PreserveSig]
    int RegisterNameSpace(
        [In] IClassFactory classFactory,
        [In] ref Guid rclsid,
        [In, MarshalAs(UnmanagedType.LPWStr)] string pwzProtocol,
        [In]
            int cPatterns,
        [In, MarshalAs(UnmanagedType.LPWStr)]
            string ppwzPatterns,
        [In] int dwReserved);

    [PreserveSig]
    int UnregisterNameSpace(
        [In] IClassFactory classFactory,
        [In, MarshalAs(UnmanagedType.LPWStr)] string pszProtocol);

    int Bogus1();

    int Bogus2();

    int Bogus3();

    int Bogus4();

    int Bogus5();
}