Create import library from dll

to_lib.py

#
# to_lib.py
# Create import library from dll
# by seffx
# Jakarta, 2024
#
# DISCLAIMER:
# Use it on your own risk, this code is provided to PUBLIC DOMAIN, "AS IS".
#
# Usage note:
# ===========
# Run this python script inside Visual Studio Developer Command Prompt (x86 or x64)
# 
# https://learn.microsoft.com/en-us/visualstudio/ide/reference/command-prompt-powershell?view=vs-2022
#
import os
import sys

MACHINE='x86' # 32 bits
#MACHINE='x64' # 64 bits

if len(sys.argv) <= 1:
    print("Usage:")
    print(f"\t{sys.argv[0]} DLL_FILE.dll")
    print()
    exit()

if not os.path.isdir("defs"):    
    os.mkdir("defs")
    
for path in sys.argv[1:]:
    dllname = os.path.basename(path)
    name = os.path.splitext(dllname)[0]
    #print(path)
    print("* ", dllname)
    #print(name)
    os.system(f'dumpbin /NOLOGO /exports "{path}" > "defs\\{name}.exports"')
    os.system(f'undname "defs\\{name}.exports" > "defs\\{name}.exports_undecorated"')
    with open(f"defs\\{name}.exports","r") as f:
        line = None
        while True:
            line = f.readline()
            if not line:
                break
            line = line.strip()
            if line.startswith("ordinal"):
                line = f.readline()
                break
        if not line:
            break
        with open(f"defs\\{name}.def","w") as o:
            o.write(f"LIBRARY {name}\n")
            o.write("EXPORTS\n")
            while True:
                line = f.readline()
                line = line.strip()
                if line == "":
                    break
                v = line.split()
                o.write(f" {v[3]} @{v[0]}\n")
    os.system(f'lib /NOLOGO /def:"defs\\{name}.def" /out:"defs\\{name}.lib" /machine:{MACHINE}')