关于C#做的COM服务 问题

[jxw3000]

我用C#做了个进程外服务器实现了一个接口
[Guid("39c13a4d-011e-11d0-9675-0020afd8adb3")]
[InterfaceTypeAttribute(ComInterfaceType.InterfaceIsIUnknown)]
ITest
{
void fuc0( ref System.Guid riid, [MarshalAs(UnmanagedType.Interface)]out object ppvObject);
void fuc1(ref System.Guid riid, [MarshalAs(UnmanagedType.IUnknown)]out object ppUnk);
void fuc2();
}
public CTest:ITest
{
void fuc0( ref System.Guid riid,out object ppvObject)
{
ppvObject = this;
}
void fuc1(ref System.Guid riid,out object ppUnk)
{
IntPtr pSite = IntPtr.Zero;
IntPtr pUnk = Marshal.GetIUnknownForObject(this);
Marshal.QueryInterface(pUnk, ref riid, out pSite);
Marshal.Release(pUnk);
Marshal.Release(pUnk);
ppUnk = pSite;
或者 用下面的实现
ppUnk= this;
}
void fuc2()
{
MessageBox.Show("fuc2 ok");
}

用C++调用
ITest：IUnknown
{
HRESULT fuc0(REFIID riid, LPVOID* ppvObject);
HRESULT fuc1(REFIID riid, LPUNKNOWN *ppUnk);
HRESULT fuc2();
}

在用实际运行期间 fuc0 的riid参数是 IDD_ITest ,返回结果正确，
fuc1的的riid参数是 IDD_IUnknown，返回结果是0xc0000005,ppUnk == NULL;
fuc2结果正确。
做了很多试验，发现如果参数是LPUNKNOWN *ppUnk 都回出错

[jxw3000]

晕啊

[jxw3000]

哦，还有个现象，如果注册为进程内COM，一切都运行正常

[shalen520]

Marshal.Release(pUnk);
Marshal.Release(pUnk);

不知道为什么要减引用计数呢,而且还是两次?

[jxw3000]

因为
IntPtr pUnk = Marshal.GetIUnknownForObject(this);
Marshal.QueryInterface(pUnk, ref riid, out pSite);
都增加了计数

[jxw3000]

哎，怎么没人理我啊