Question

I have a block of code that works great in 32bit, and I’m trying to make it work in 64bit as well. When running the process, the sizeof(structure) seems to be returning invalid options, and the structure isn’t being populated properly for 64bit. What do I need to do to make this function in 64bit?

from ctypes import *
from ctypes.wintypes import *
import sys


# const variable
# Establish rights and basic options needed for all process declartion / iteration
TH32CS_SNAPPROCESS = 2
STANDARD_RIGHTS_REQUIRED = 0x000F0000
SYNCHRONIZE = 0x00100000
PROCESS_ALL_ACCESS = (STANDARD_RIGHTS_REQUIRED | SYNCHRONIZE | 0xFFF)
TH32CS_SNAPMODULE = 0x00000008
TH32CS_SNAPTHREAD = 0x00000004

#class MODULEENTRY32(Structure):
#    _fields_ = [ ( 'dwSize' , DWORD ) , 
#                ( 'th32ModuleID' , DWORD ),
#                ( 'th32ProcessID' , DWORD ),
#                ( 'GlblcntUsage' , DWORD ),
#                ( 'ProccntUsage' , DWORD ) ,
#                ( 'modBaseAddr' , LONG ) ,
#                ( 'modBaseSize' , DWORD ) , 
#                ( 'hModule' , HMODULE ) ,
#                ( 'szModule' , c_char * 256 ),
#                ( 'szExePath' , c_char * 260 ) ]


class MODULEENTRY32(Structure):
    _fields_ = [ ( 'dwSize' , c_long ) , 
                ( 'th32ModuleID' , c_long ),
                ( 'th32ProcessID' , c_long ),
                ( 'GlblcntUsage' , c_long ),
                ( 'ProccntUsage' , c_long ) ,
                ( 'modBaseAddr' , c_long ) ,
                ( 'modBaseSize' , c_long ) , 
                ( 'hModule' , c_void_p ) ,
                ( 'szModule' , c_char * 256 ),
                ( 'szExePath' , c_char * 260 ) ]


CreateToolhelp32Snapshot= windll.kernel32.CreateToolhelp32Snapshot
Process32First = windll.kernel32.Process32First
Process32Next = windll.kernel32.Process32Next
Module32First = windll.kernel32.Module32First
Module32Next = windll.kernel32.Module32Next
GetLastError = windll.kernel32.GetLastError
OpenProcess = windll.kernel32.OpenProcess
GetPriorityClass = windll.kernel32.GetPriorityClass
CloseHandle = windll.kernel32.CloseHandle


try:
    ProcessID=22052
    hModuleSnap = DWORD
    me32 = MODULEENTRY32()
    me32.dwSize = sizeof( MODULEENTRY32 )
    #me32.dwSize = 5000
    hModuleSnap = CreateToolhelp32Snapshot( TH32CS_SNAPMODULE, ProcessID )
    ret = Module32First( hModuleSnap, pointer(me32) )
    if ret == 0 :
        print 'ListProcessModules() Error on Module32First[%d]' % GetLastError()
        CloseHandle( hModuleSnap )
    global PROGMainBase
    PROGMainBase=False
    while ret :
        print me32.dwSize
        print me32.th32ModuleID
        print me32.th32ProcessID
        print me32.GlblcntUsage
        print me32.ProccntUsage
        print me32.modBaseAddr
        print me32.modBaseSize
        print me32.hModule
        print me32.szModule
        print me32.szExePath
        ret = Module32Next( hModuleSnap , pointer(me32) )
    CloseHandle( hModuleSnap )



except:
    print "Error in ListProcessModules"

Answer 1

Try using the correct definition:

class MODULEENTRY32(Structure):
    _fields_ = [( 'dwSize' , DWORD ) , 
                ( 'th32ModuleID' , DWORD ),
                ( 'th32ProcessID' , DWORD ),
                ( 'GlblcntUsage' , DWORD ),
                ( 'ProccntUsage' , DWORD ) ,
                ( 'modBaseAddr' , POINTER(BYTE) ) ,
                ( 'modBaseSize' , DWORD ) , 
                ( 'hModule' , HMODULE ) ,
                ( 'szModule' , c_char * 256 ),
                ( 'szExePath' , c_char * 260 ) ]