pkit pkit - 5 months ago 27
Python Question

Determine if an executable (or library) is 32 -or 64-bits (on Windows)

I am trying to find out if a given executable (or library) is compiled for 32-bits or 64-bits from Python. I am running Vista 64-bits and would like to determine if a certain application in a directory is compiled for 32-bits or 64-bits.

Is there a simple way to do this using only the standard Python libraries (currently using 2.5.4)?


The Windows API for this is GetBinaryType. You can call this from Python using pywin32:

import win32file
if type==win32file.SCS_32BIT_BINARY:
    print "32 bit"
# And so on

If you want to do this without pywin32, you'll have to read the PE header yourself. Here's an example in C#, and here's a quick port to Python:

import struct


f=open("c:\windows\explorer.exe", "rb")
if s!="MZ":
    print "Not an EXE file"
    header_offset=struct.unpack("<L", s)[0]
    machine=struct.unpack("<H", s)[0]

    if machine==IMAGE_FILE_MACHINE_I386:
        print "IA-32 (32-bit x86)"
    elif machine==IMAGE_FILE_MACHINE_IA64:
        print "IA-64 (Itanium)"
    elif machine==IMAGE_FILE_MACHINE_AMD64:
        print "AMD64 (64-bit x86)"
        print "Unknown architecture"