HELP: how to load satellite DLL for a DLL

This is a discussion on HELP: how to load satellite DLL for a DLL within the Windows Programming forums, part of the Platform Specific Boards category; I have a Visual C++ workspace that has 2 projects (1 exe & 1 DLL). I used Serge Wautier's tutorial ...

  1. #1
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    Mar 2009
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    HELP: how to load satellite DLL for a DLL

    I have a Visual C++ workspace that has 2 projects (1 exe & 1 DLL).

    I used Serge Wautier's tutorial ( Resource DLLs and Language Selection Menu - CodeProject ) to create (multi-language) resource DLLs (satellite DLLs) branching off the exe.

    Now I have a collection of strings in the DLL that are shared in other projects. I created a satellite DLL for that DLL but can't figure out how to load it on-demand just like the exe's satellite DLL.

    He used:
    Code:
    HINSTANCE hDll = LoadLibrary(szFilename);
    Code:
    AfxSetResourceHandle(hDll);
    Code:
    void CLanguageSupport::UnloadResourceDll()
    {
    if (m_hDll!=NULL)
    {
    SetResourceHandle(AfxGetApp()->m_hInstance); // Restores the EXE as the resource container.
    FreeLibrary(m_hDll);
    m_hDll= NULL;
    }
    }
    etc etc for the unloading/loading satellite DLLs for the exe.
    but how to do the same for the DLL?

  2. #2
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    Mar 2009
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    12
    I think I got it working:

    From VC2005 there's a function called AddResourceInstance() to chain DLLs. However am still using VC6 so this function doesn't exist.

    So I just copied some code from a DLL project. The DLL main file contains these lines:

    Code:
    static AFX_EXTENSION_MODULE NEAR extensionDLL = { NULL, NULL };
    DllMain(HINSTANCE hInstance, DWORD dwReason, LPVOID lpReserved)
    {
        AfxInitExtensionModule(extensionDLL, hInstance);
        new CDynLinkLibrary(extensionDLL);
    }

    This dynamically loads the DLL. If we put some of this code into the EXE project like so:


    Code:
    HINSTANCE hDll2 = LoadLibrary(szFilename2);
    AfxInitExtensionModule(extensionDLL,hDll2);
    new CDynLinkLibrary(extensionDLL);
    After the AfxSetResourceHandle(hDll); //setting satellite DLL overriding EXE resources

    Originally, the EXE would be the resource container, but AfxSetResourceHandle(satelliteDLL) will set loaded DLL as default resource container, overriding the EXE like.

    We use the above extension DLL to chain (add-on) another resource DLL.

    The only issues now is freeing the library/memory..

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