hello everyone.

i have created a com+ made by C#.

The COM+ is singleton.
   [InterfaceType(ComInterfaceType.InterfaceIsDual)]
   [Guid("9b7384f1-7fd3-444f-acd9-0551ae878caf")]
   public interface IOpenInterface
   {
       bool K_SetEventId(string strSourceId, string strEventId);
       int test();
   }

   [JustInTimeActivation]
   [ObjectPooling(Enabled = true, MinPoolSize = 1, MaxPoolSize = 1,
   CreationTimeout = 5000)]
   [Guid("6d1bcaf4-1d35-44c5-b7cb-7431550ee9c0")]
   [ProgId("EasyEda.OpenInterface")]
   [ComVisible(true)]
   public sealed class IOpenComponent : ServicedComponent, IOpenInterface
   {

       public IOpenComponent() { }

       public int test()
       {
           System.Diagnostics.Debugger.Break();
           return 10;
       }
       public bool K_SetEventId(string strSourceId, string strEventId)
       {
           System.Diagnostics.Debugger.Break();
           return CEdaInterface.edaInstance.K_SetEventId(strSourceId,
strEventId);
       }
 }

i called the test function from dll made by c++.

it's ok.

but i called the other function from dll made by c++.

but a error was happened.

    CoInitialize(NULL);
    HRESULT hr = CoCreateInstance(CLSID_IOpenComponent ,
              NULL, CLSCTX_LOCAL_SERVER,
              IID_IOpenInterface ,
reinterpret_cast<void**>(&gIOpenInterface));
    if(FAILED(hr))
    {
        OutputDebugString("The Interface failed");
        return FALSE;
    }
    printf("%d\n", gIOpenInterface->test());==> it's ok.
    _bstr_t bstr = ::SysAllocString(L"TEST");
    gIOpenInterface->K_SetEventId(bstr, bstr);==> The error was happened.

i tried to solve this problem many times..but i can't...

anyone help me solve this problem.

best regards.