I'd like to write a test script or program that asserts that all DLL files in a given directory are of a particular build type.
I would use this as a sanity check at the end of a build process on an SDK to make sure that the 64-bit version hasn't somehow got some 32-bit DLL files in it and vice versa.
Is there an easy way to look at a DLL file and determine its type?
The solution should work on both xp32 and xp64.
A crude way would be to call dumpbin with the headers option from the Visual Studio tools on each DLL and look for the appropriate output:
dumpbin /headers my32bit.dll
PE signature found
File Type: DLL
FILE HEADER VALUES
14C machine (x86)
1 number of sections
45499E0A time date stamp Thu Nov 02 03:28:10 2006
0 file pointer to symbol table
0 number of symbols
E0 size of optional header
2102 characteristics
Executable
32 bit word machine
DLL
OPTIONAL HEADER VALUES
10B magic # (PE32)
You can see a couple clues in that output that it is a 32 bit DLL, including the 14C value that Paul mentions. Should be easy to look for in a script.
I have written a very simple tool that does exactly that - it's called PE Deconstructor.
Simply fire it up and load your DLL file:
In the example above, the loaded DLL is 32-bit.
You can download it here (I only have the 64-bit version compiled ATM):
https://files.quickmediasolutions.com/exe/pedeconstructor_0.1_amd64.exe
An older 32-bit version is available here:
https://dl.dropbox.com/u/31080052/pedeconstructor.zip