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;

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

  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);


  • Good tip indeed! Man, You did it.

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

    Originally posted by: Jeff Zhang


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

    Originally posted by:

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  • Your email address will not be published.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

Top White Papers and Webcasts

  • Moving from an on-premises environment to Office 365 does not remove the need to plan for disruptions or reduce the business risk requirements for protecting email services. If anything, some risks increase with a move to the cloud. Read how to ease the transition every business faces if considering or already migrating to cloud email. This white paper discusses: Setting expectations when migrating to Office 365 Understanding the implications of relying solely on Exchange Online security Necessary archiving …

  • Lenovo recommends Windows 8 Pro. "I dropped my laptop getting out of the taxi." This probably sounds familiar to most IT professionals. If your employees are traveling, you know their devices are in for a rough go. Whether it's a trip to the conference room or a convention out of town, any time equipment leaves a user's desk it is at risk of being put into harm's way. Stay connected at all times, whether at the office or on the go, with agile, durable, and flexible devices like the Lenovo® …

Most Popular Programming Stories

More for Developers

RSS Feeds

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