How to use your own DllMain in MFC Dll's

Environment:VC 6.0

If you want to write your own DllMain in a MFC Dll then you have to do some real cool stuff because MFC internally calls its DllMain. If you try to write your own DllMain, you get a linker error saying "DllMain already defined". To resolve this issue you have to copy "DllModul.cpp" from MFC source directory to your project directory and include it in your own project.

The code for this follows:
//////////////////////////////////////////////
// export DllMain for the DLL
 
extern "C"
BOOL WINAPI DllMain(HINSTANCE hInstance, 
                    DWORD dwReason, 
                    LPVOID /*lpReserved*/)
{
  //.................
  // Add your own initialisation Here
  if (dwReason == DLL_PROCESS_ATTACH)
  {
    BOOL bResult = FALSE;
 
#ifdef _AFXDLL
    // wire up resources from core DLL
    AfxCoreInitModule();
#endif
    ...
    ... 
    ...
    return TRUE;
}


Comments

  • good but why?

    Posted by flyingxu on 11/08/2007 02:35am

    I wrote a blog about why you shoud add that file:
    http://www.codediscuss.com/mfc/dllmain-in-mfc-dll/

    Reply
  • good - _-)b

    Posted by Legacy on 05/10/2003 12:00am

    Originally posted by: yo

    greate solved my problem

    Reply
  • Does VC++/C++ is supported by JNI?

    Posted by Legacy on 09/06/2002 12:00am

    Originally posted by: Padmashree Desai

    Dear Sir/Madam
    
    

    In our project we need to find RAM & HDD capacity using mobile agent concept. But JAVA gives only virtual m/c capacity. So we need to use JNI. We need to write a C++ or VC++ program for this API. Please tell me whether I should go for C++/VC++. & how?


    Thanking you,

    Padmashree.

    Reply
  • How do i capture clients scree using VC++ programming at the server end

    Posted by Legacy on 02/07/2002 12:00am

    Originally posted by: Rambhavan Verma

    Dear sir,
    this is rambhavan verma here.
    Please try to give me some suggestions/solutions on the above mentioned page title.
    I have to do one project on the above mentioned topic.If you can help me then try to send me some code or any suggestions on the respective topic.
    Thanking you,
    Rambhavan Verma.

    Reply
  • You don't need a DllMain anyway

    Posted by Legacy on 02/01/2002 12:00am

    Originally posted by: bug_crusher

    A Regular MFC dll doesn't even need a DllMain function. Its only needed for ISAPI dlls and MFC Extension Dlls. For a regular MFC dll, you are better off by leaving it alone and not writing your own. There is no reason to do this nonsense at all. I hope someone reads TN033 before they take this bad advice.

    • Imagine ...

      Posted by HaLbMiLcH on 03/19/2004 08:28pm

      of actions necessary at process attach time AND the need of using MFC classes in that DLL. A basic win32 dll can't resolve this use case.

      Reply
    Reply
Leave a Comment
  • Your email address will not be published. All fields are required.

Top White Papers and Webcasts

  • Organizations are increasingly gravitating toward mobile-first application development as they assess the need to revamp their application portfolios to support touch computing and mobility. Consumerization has brought higher expectations for application usability along with the mobile devices themselves. Enterprises are increasingly shifting their new application acquisitions and development efforts toward mobile platforms. With this backdrop, it is natural to expect application platform vendors to invest in …

  • Cloud computing isn't new, but it's still a hot topic in technology circles. Moving to the cloud has done great things for many businesses. When it comes to handling a basic business necessity, cloud computing has brought many improvements to overall business continuity. Using the cloud for DR makes a lot of sense for many, but it's not exactly the most simple concept. Read this eBook to find answers to all the key questions IT professionals have about cloud-based disaster recovery, and helpful info around the …

Most Popular Programming Stories

More for Developers

RSS Feeds

Thanks for your registration, follow us on our social networks to keep up-to-date