C/C++ EXEs and DLLs created by Visual Studio 2008 don't run on Windows 4.0 (ie, NT4 and Win9x)

Louis Solomon / SteelBytes

Written 22/Apr/08

Revised 23/Apr/08 typo's and comment about link.exe/editbin.exe, and the 'quick notes'

Added Link 25/Aug/08 My command line tool that patches compiled code ExeVersion

Added Link 27/Aug/08 other related work LegacyExtender

Here is the result of my exploring this problem ... YMMV :-)

Part 1 (NT4 and Win9x): the required OS version flags in the .exe header are set to 5.0. Can you use Link.exe's or EditBin.exe's /SUBSYSTEM switch to fix this? No, as they don't let you set a value less then 5.0 on both the OS and SubSystem fields (using older version of EditBin from some older version of VS/VC/SDK apparently works). Solution is to patch 'em back to 4.0, here is some code that will do that

HANDLE hfile = CreateFile(argv[1],GENERIC_READ|GENERIC_WRITE,0,0,OPEN_EXISTING,0,NULL);

if (hfile!=INVALID_HANDLE_VALUE)

{

HANDLE hmapping = CreateFileMapping(hfile,0,PAGE_READWRITE,0,0,0);

if (hmapping)

{

BYTE *file_base = (BYTE *)MapViewOfFileEx(hmapping,FILE_MAP_ALL_ACCESS,0,0,0,0);

if (file_base)

{

IMAGE_OPTIONAL_HEADER *ioh = (IMAGE_OPTIONAL_HEADER *)(file_base + ((IMAGE_DOS_HEADER *)file_base)->e_lfanew + 4 + sizeof(IMAGE_FILE_HEADER));

ioh->MajorOperatingSystemVersion = 4;

ioh->MinorOperatingSystemVersion = 0;

ioh->MajorSubsystemVersion = 4;

ioh->MinorSubsystemVersion = 0;

UnmapViewOfFile(file_base);

}

CloseHandle(hmapping);

}

CloseHandle(hfile);

}

Part 2 (Win9x): the CRT uses the Unicode / Widechar version of GetModuleHandle() in it's internal _crt_waiting_on_module_handle(). Here is a replacement that doesn't

extern "C" __declspec(noinline) HMODULE __cdecl _crt_waiting_on_module_handle(LPCWSTR szModuleName)

{

#define INCR_WAIT                          1000

#define _MAX_WAIT_MALLOC_CRT 60000

    char szModuleNameA[MAX_PATH];

    WideCharToMultiByte(CP_ACP,0,szModuleName,-1,szModuleNameA,_countof(szModuleNameA),NULL,NULL);

    unsigned long nWaitTime = INCR_WAIT;

    HMODULE hMod = GetModuleHandleA(szModuleNameA);

Read more: louis.steelbytes.com

QR: 

Posted via email from Jasper-net