Dumpbin

lastmod 2019-12-11created 2018-11-217 edits

The Microsoft COFF Binary File Dumper (DUMPBIN.EXE) displays information about COFF (Common Object File Format) binary files. You can use DUMPBIN to examine COFF object files, standard libraries of COFF objects, executable files, and DLLs (dynamic-link libraries).

Example

Show symbols

/SYMBOLS | Microsoft Docs

This option displays the COFF symbol table. Symbol tables exist in all object files. A COFF symbol table appears in an image file only if it is linked with /DEBUG.

dumpbin /SYMBOLS openblas.lib

Export symbols

/EXPORTS | Microsoft Docs

This option displays all definitions exported from an executable file or DLL.

dumpbin /EXPORTS main.obj

32bit or 64bit

How to check if a binary is 32 or 64 bit on Windows?

The SDK tool dumpbin.exe with the /headers option includes this information, compare these two (I've added bold for the key information)

PS [64] E:\ #4> dumpbin /headers C:\Windows\system32\cmd.exe
Microsoft (R) COFF/PE Dumper Version 10.00.40219.01
Copyright (C) Microsoft Corporation.  All rights reserved.


Dump of file C:\Windows\system32\cmd.exe

PE signature found

File Type: EXECUTABLE IMAGE

FILE HEADER VALUES
            8664 machine (x64)
               6 number of sections
        4CE798E5 time date stamp Sat Nov 20 09:46:13 2010
               0 file pointer to symbol table
               0 number of symbols
              F0 size of optional header
              22 characteristics
                   Executable
                   Application can handle large (>2GB) addresses
[...]

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