Tip: Detecting a HMODULE/HINSTANCE Handle Within the Module You're Running In

Environment: VC++, DLLs

Most DLL developers have faced the challenge of detecting a HMODULE/HINSTANCE handle within the module you're running in. It may be a difficult task if you wrote the DLL without a DLLMain() function or you are unaware of its name. For example:

Your DLL was built without ATL/MFC, so the DLLMain() function exists, but it's hidden from you code and you cannot access the hinstDLL parameter. You do not know the DLL's real file name because it could be renamed by everyone, so GetModuleHandle() is not for you.

This small code can help you solve this problem:

#if _MSC_VER >= 1300    // for VC 7.0
  // from ATL 7.0 sources
  #ifndef _delayimp_h
  extern "C" IMAGE_DOS_HEADER __ImageBase;
  #endif
#endif

HMODULE GetCurrentModule()
{
#if _MSC_VER < 1300    // earlier than .NET compiler (VC 6.0)

  // Here's a trick that will get you the handle of the module
  // you're running in without any a-priori knowledge:
  // http://www.dotnet247.com/247reference/msgs/13/65259.aspx

  MEMORY_BASIC_INFORMATION mbi;
  static int dummy;
  VirtualQuery( &dummy, &mbi, sizeof(mbi) );

  return reinterpret_cast<HMODULE>(mbi.AllocationBase);

#else    // VC 7.0

  // from ATL 7.0 sources

  return reinterpret_cast<HMODULE>(&__ImageBase);
#endif
}


Comments

  • Good tip indeed! Man, You did it.

    Posted by Legacy on 07/23/2003 12:00am

    Originally posted by: Jeff Zhang

    applaude!

    Reply
  • Posted by Legacy on 07/21/2003 12:00am

    Originally posted by:

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  • Your email address will not be published.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

Top White Papers and Webcasts

  • Live Event Date: December 11, 2014 @ 1:00 p.m. ET / 10:00 a.m. PT Market pressures to move more quickly and develop innovative applications are forcing organizations to rethink how they develop and release applications. The combination of public clouds and physical back-end infrastructures are a means to get applications out faster. However, these hybrid solutions complicate DevOps adoption, with application delivery pipelines that span across complex hybrid cloud and non-cloud environments. Check out this …

  • Hundreds of millions of users have adopted public cloud storage solutions to satisfy their Private Online File Sharing and Collaboration (OFS) needs. With new headlines on cloud privacy issues appearing almost daily, the need to explore private alternatives has never been stronger. Join ESG Senior Analyst Terri McClure and Connected Data in this on-demand webinar to take a look at the business drivers behind OFS adoption, how organizations can benefit from on-premise deployments, and emerging private OFS …

Most Popular Programming Stories

More for Developers

RSS Feeds