Hi. I'm developing a program that instantiates a COM executable. In my machine the problem doesn't occur, but in the machine of a colleague we have this problem. The source code are the same, without any modification. We are using Visual C++ 6.0 SP5, Win2K and WinXP. The code below are the code that works in one machine and in another doesn't work.

    HRESULT                       hr;
    IUnknown                    * pXXXXX;
    IConnectionPointContainer   * pCPC;
    IConnectionPoint            * pCPIXXXXXEvents;

    // Call COM service to create an instance.
    pXXXXX          = NULL;
    pCPIXXXXXEvents = NULL;
    pCPC               = NULL;
    m_pIXXXXXEvents = new CIXXXXXEvents(this);
    m_bComError        = TRUE;

    hr = CoCreateInstance(CLSID_XXXXX, NULL, CLSCTX_LOCAL_SERVER, IID_IUnknown, (LPVOID*)&pXXXXX);
    if (FAILED(hr))
    {
        pXXXXX = NULL;
        OutputDebugString("Failed to create XXXXX COM object");
    }

    hr = pXXXXX->QueryInterface(IID_IXXXXX, (LPVOID*)&m_pIXXXXX);
    if (FAILED(hr))
    {
        m_pIXXXXX = NULL;
        OutputDebugString("Couldn't QueryInterface for m_pIXXXXX");
    }

    //Asking ConnectionPointContainer.
    hr = pXXXXX->QueryInterface(IID_IConnectionPointContainer, (LPVOID*)&pCPC);
    if(FAILED(hr))
    {
        OutputDebugString("Couldn't QueryInterface for pCPC");
    }

    //looking for ConnectionPoint into this.
    hr = pCPC->FindConnectionPoint(__uuidof(_IXXXXXEvents), &pCPIXXXXXEvents);
    if(FAILED(hr))
    {
        OutputDebugString("Couldn't FindConnectionPoint for pCPIXXXXXEvents");
    }

    //Registering my interfaces.
    hr = pCPIXXXXXEvents->Advise(m_pIXXXXXEvents, &ulAdviseSFN);
    if(FAILED(hr))
    {
        // the error occurs here. The hr is equal -2147220990 and the I can't be advised from
        // the executable to my program.:((
        OutputDebugString("Couldn't Advise for m_pIXXXXXEvents");
    }

Anyone has any idea of what is happening and a suggestion of how to solve it? Thanks Dennis

About the item 1, I will analyze further the method __declspec(thread) and try to use it. But in the 2nd item, you told me to rebuild DLL using the multi-threaded libraries. In Visual C++ 6, Project->Settings, C/C++ tab with Code Generation option selected, it has an combo box called "Use run-time library". The option selected there already is "Multithreaded DLL". There's another way to configure this? How it does? Dennis

I'm not using LoadLibrary method. I'm importing the .tlb of the DLL file and then linking to my program. To create a new instance of the DLL, im using the methods CoInitializeEx with the parameters 0 and COINIT_MULTITHREADED and then CoCreateInstance with the parameters CLSID_DLL, NULL, CLSCTX_ALL, IID_IUnknown, (LPVOID*)&pointer);

Hi. I'm developing a program with visual C++ that creates multiple threads and each thread creates a new instance of the same DLL (which I have the the code, but I didn't developed it). The problem I'm having is that when I create the first thread, the DLL is instantiated correctly but when I create the second thread and try to create a new instance of the dll, I didn't actually create a new instance, but just makes an instance of the DLL already instantiated, and so I overwrite some variables and stuffs like that. If, instead create two threads I execute the program twice, running at the same time, I can make new instances of the DLL. Why in this way I can make a new instance of the DLL and using threads I can't? How do I know if the DLL was created as a multithreaded DLL? And another question is if the DLL wasn't created a multithreade DLL, how can I change this? Dennis