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how to know the any DLL is 32 bit or 64 bit
Updated 9-Mar-21 0:34am

Have a look on this, Similar discussion on Stackoverflow.[^]

P.S: First try in google(this will more options to you), put some effort on that & if you face any difficulties or errors, come to CP and post it here.
Good answer, my 5.
TweakBird 24-Mar-11 13:58pm
Thank you
Sandeep Mewara 24-Mar-11 5:19am
Good answer. My 5!
Here's a C++ MFC console application that writes out the header information. You can check the machine type (IMAGE_FILE_HEADER Machine member) or the IMAGE_FILE_32BIT_MACHINE flag in the Characteristics. See WinNT.h for more info.

#include "stdafx.h"

int _tmain(int argc, TCHAR* argv[], TCHAR* envp[])
  int nRetCode = 0;
  int nrd;


  // initialize MFC and print and error on failure
  if (!AfxWinInit(::GetModuleHandle(NULL), NULL, ::GetCommandLine(), 0))
    // TODO: change error code to suit your needs
    _tprintf(_T("Fatal Error: MFC initialization failed\n"));
    nRetCode = 1;
    return 1;
  if (argc != 2) {
    _ftprintf(stderr, _T("Usage: %s filename\n"), argv[0]);
    return 1;
  // Try to open the file
  CFile ckf;
  CFileException ex;
  DWORD flags = CFile::modeRead | CFile::shareDenyNone;

  if (!ckf.Open(argv[1], flags, &ex)) {
    TCHAR szError[1024];
    ex.GetErrorMessage(szError, 1024);
    _tprintf_s(_T("Couldn't open file: %1024s"), szError);
    return 2;

  // The following is adapted from:
  // Seek to beginning of file
  ckf.Seek(0, CFile::begin);

  // Read DOS header
  int nbytes = sizeof(IMAGE_DOS_HEADER);
  nrd = ckf.Read(&idh, nbytes);

  // The idh.e_lfanew member is the offset to the NT_HEADERS structure
  ckf.Seek(idh.e_lfanew, CFile::begin);

  // Read NT headers
  nbytes = sizeof(IMAGE_NT_HEADERS);
  nrd = ckf.Read(&inth, nbytes);

  ifh = inth.FileHeader;

  _ftprintf(stdout, _T("File machine type: "));
  switch (ifh.Machine) {
     case IMAGE_FILE_MACHINE_I386:
       _ftprintf(stdout, _T("I386\n"));
       _ftprintf(stdout, _T("IA64\n"));
       _ftprintf(stdout, _T("AMD64\n"));
       _ftprintf(stdout, _T("Unknown (%d = %X)\n"), ifh.Machine, ifh.Machine);

  // Write characteristics (see WinNT.h)
  _ftprintf(stdout, _T("Characteristics:\n"));
  _ftprintf(stdout, _T("RELOCS_STRIPPED Relocation info stripped from file: %c\n"),
    (ifh.Characteristics & IMAGE_FILE_RELOCS_STRIPPED ? _T('Y') : _T('N')));
  _ftprintf(stdout, _T("EXECUTABLE_IMAGE File is executable  (i.e. no unresolved externel references): %c\n"),
    (ifh.Characteristics & IMAGE_FILE_EXECUTABLE_IMAGE ? _T('Y') : _T('N')));
  _ftprintf(stdout, _T("LINE_NUMS_STRIPPED Line nunbers stripped from file: %c\n"),
    (ifh.Characteristics & IMAGE_FILE_LINE_NUMS_STRIPPED ? _T('Y') : _T('N')));
  _ftprintf(stdout, _T("LOCAL_SYMS_STRIPPED Local symbols stripped from file: %c\n"),
    (ifh.Characteristics & IMAGE_FILE_LOCAL_SYMS_STRIPPED ? _T('Y') : _T('N')));
  _ftprintf(stdout, _T("AGGRESIVE_WS_TRIM Agressively trim working set: %c\n"),
    (ifh.Characteristics & IMAGE_FILE_AGGRESIVE_WS_TRIM ? _T('Y') : _T('N')));
  _ftprintf(stdout, _T("LARGE_ADDRESS_AWARE App can handle >2gb addresses: %c\n"),
    (ifh.Characteristics & IMAGE_FILE_LARGE_ADDRESS_AWARE ? _T('Y') : _T('N')));
  _ftprintf(stdout, _T("BYTES_REVERSED_LO Bytes of machine word are reversed: %c\n"),
    (ifh.Characteristics & IMAGE_FILE_BYTES_REVERSED_LO ? _T('Y') : _T('N')));
  _ftprintf(stdout, _T("32BIT_MACHINE 32 bit word machine: %c\n"),
    (ifh.Characteristics & IMAGE_FILE_32BIT_MACHINE ? _T('Y') : _T('N')));
  _ftprintf(stdout, _T("DEBUG_STRIPPED Debugging info stripped from file in .DBG file: %c\n"),
    (ifh.Characteristics & IMAGE_FILE_DEBUG_STRIPPED ? _T('Y') : _T('N')));
  _ftprintf(stdout, _T("REMOVABLE_RUN_FROM_SWAP If Image is on removable media, copy and run from the swap file: %c\n"),
    (ifh.Characteristics & IMAGE_FILE_REMOVABLE_RUN_FROM_SWAP ? _T('Y') : _T('N')));
  _ftprintf(stdout, _T("NET_RUN_FROM_SWAP If Image is on Net, copy and run from the swap file: %c\n"),
    (ifh.Characteristics & IMAGE_FILE_NET_RUN_FROM_SWAP ? _T('Y') : _T('N')));
  _ftprintf(stdout, _T("SYSTEM System File: %c\n"),
    (ifh.Characteristics & IMAGE_FILE_SYSTEM ? _T('Y') : _T('N')));
  _ftprintf(stdout, _T("DLL File is a DLL: %c\n"),
    (ifh.Characteristics & IMAGE_FILE_DLL ? _T('Y') : _T('N')));
  _ftprintf(stdout, _T("UP_SYSTEM_ONLY File should only be run on a UP machine: %c\n"),
    (ifh.Characteristics & IMAGE_FILE_UP_SYSTEM_ONLY ? _T('Y') : _T('N')));
  _ftprintf(stdout, _T("BYTES_REVERSED_HI Bytes of machine word are reversed: %c\n"),
    (ifh.Characteristics & IMAGE_FILE_BYTES_REVERSED_HI ? _T('Y') : _T('N')));


  return nRetCode;
CHill60 9-Mar-21 7:03am
You posted this same "solution" yesterday. I suspect it was deleted for being "off topic" - which is likely to happen to this one too. The question is tagged as "C#" and "ASP.NET" - You are posting C/MFC solutions - that is off-topic for this (10 year old) question. If you are that desperate to get this code out there then write a Tip - see Submit a new Article[^]
johmat 9-Mar-21 9:19am
Sorry about that - when I checked this morning and didn't see the article I thought something had gone wrong with the original post. I won't post it again. That said, just because it's tagged C# doesn't mean other language solutions aren't helpful. I was just trying to help after my own searching for a solution was insufficient. But whatever.
CHill60 9-Mar-21 10:05am
That's why I'm suggesting you might want to write a Tip about it. I get your point about things in other languages often being useful, but the QA forum is more about asking a question then getting an answer. We do have some trigger-happy members too!
I think it's great that you are trying to help others - please don't let me put you off!

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