使用Windows V2凭据提供程序进行钻石继承

Question

以下情况：

我有一个工作的V1 CP，它实现了IConnectableCredentialProviderCredential接口。这种依赖关系对于访问我需要的IQueryContinueWithStatus接口是必要的。

class CCredential : public IConnectableCredentialProviderCredential
{
    [...]

IConnectableCredentialProviderCredential实现了ICredentialProviderCredential。

COM IUknown查询方法使用以下代码片段完成：

IFACEMETHODIMP QueryInterface(__in REFIID riid, __deref_out void** ppv)
{
    static const QITAB qitOnlyCredUI[] =
    {
        QITABENT(CCredential, ICredentialProviderCredential),
        { 0 },
    };

    static const QITAB qitFull[] =
    {
        QITABENT(CCredential, ICredentialProviderCredential), // IID_ICredentialProviderCredential
        QITABENT(CCredential, IConnectableCredentialProviderCredential), // IID_IConnectableCredentialProviderCredential            
        { 0 },
    };

[...]

现在，我希望将提供程序迁移为V2 CP，并实现ICredentialProviderCredential2接口，但要与IQueryContinueWithStatus接口保持兼容。另外，删除QITABENT(CCredential, ICredentialProviderCredential)是没有选择的，因为在请求CredUI (不支持IQueryContinueWithStatus )的情况下，qitOnlyCredUI是必需的。

class CCredential : public IConnectableCredentialProviderCredential,
                    public ICredentialProviderCredential2,
                    public ICredentialProviderCredentialWithFieldOptions
{
    [...]

ICredentialProviderCredential2实现了ICredentialProviderCredential。

实现COM QueryInterface方法如下：

IFACEMETHODIMP QueryInterface(__in REFIID riid, __deref_out void** ppv)
{
    static const QITAB qitOnlyCredUI[] =
    {
        QITABENT(CCredential, ICredentialProviderCredential),
        { 0 },
    };

    static const QITAB qitFull[] =
    {
        QITABENT(CCredential, ICredentialProviderCredential), // IID_ICredentialProviderCredential
        QITABENT(CCredential, ICredentialProviderCredential2), // IID_ICredentialProviderCredential2
        QITABENT(CCredential, IConnectableCredentialProviderCredential), // IID_IConnectableCredentialProviderCredential            
        QITABENT(CCredential, ICredentialProviderCredentialWithFieldOptions), //IID_ICredentialProviderCredentialWithFieldOptions
        { 0 },
    };

这就是钻石问题的起点，因为ICredentialProviderCredential2和IConnectableCredentialProviderCredential都实现了ICredentialProviderCredential。

试图编译肯定会导致编译器抱怨ICredentialProviderCredential基类的定义不明确。

有什么办法可以做到吗？

Answer 1

您需要为您的情况使用QITABENTMULTI()宏。它被记录在shlwapi.h中。我不知道它为什么不在MSDN上。