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  • Your email address will not be published.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: July 30, 2014 @ 11:00 a.m. ET / 8:00 a.m. PT You may already know about some of the benefits of Bluemix, IBM's open platform for developing and deploying mobile and web applications. Check out this upcoming eSeminar that focuses on building an Android application using the MobileData service, with a walk-through of the real process and workflow used to build and link the MobileData service within your application. Join IBM's subject matter experts as they show you the way to build a base …

  • Is your sales and operations planning helping or hurting your bottom line? Here are 5 useful tips from the experts at Quintiq to guide you to a better S&OP strategy.

Most Popular Programming Stories

More for Developers

Latest Developer Headlines

RSS Feeds