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I have compiled below code but cannot execute the "PPP.exe".

'.exe' file exists same directory with '.py' file.

Why cannot working(or "open") this code?? Please let me know.

import ctypes
ctypes.windll.shell32.ShellExecuteA(0, 'open', "PPP.exe",  None, None, 1)
Jung-soo Lee
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1 Answers1

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Use ShellExecuteW. Your strings are Unicode strings and are passed as wchar_t* to C.

Alternatively, use byte strings with ShellExecuteA, e.g. b'open' and b'PPP.exe'.

If you fully define the arguments and return type (always recommended), then ctypes will type-check for you and return an error if the type is incorrect:

import ctypes as ct
from ctypes import wintypes as w

SW_SHOWNORMAL = 1

shell32 = ct.WinDLL('shell32')
shell32.ShellExecuteA.argtypes = w.HWND, w.LPCSTR, w.LPCSTR, w.LPCSTR, w.LPCSTR, w.INT
shell32.ShellExecuteA.restype = w.HINSTANCE
shell32.ShellExecuteW.argtypes = w.HWND, w.LPCWSTR, w.LPCWSTR, w.LPCWSTR, w.LPCWSTR, w.INT
shell32.ShellExecuteW.restype = w.HINSTANCE

# works
shell32.ShellExecuteA(None, b'open', b'cmd.exe', None, None, SW_SHOWNORMAL)

# works
shell32.ShellExecuteW(None, 'open', 'cmd.exe', None, None, SW_SHOWNORMAL)

# ctypes.ArgumentError: argument 2: <class 'TypeError'>: wrong type
shell32.ShellExecuteA(None, 'open', 'cmd.exe', None, None, SW_SHOWNORMAL)

# ctypes.ArgumentError: argument 2: <class 'TypeError'>: wrong type
shell32.ShellExecuteW(None, b'open', b'cmd.exe', None, None, SW_SHOWNORMAL)
Mark Tolonen
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  • wow.. Exactly, because of VScode encdoding. I tried to "".encode('cp949'). I should have checked return code! Thank you so much :) – Jung-soo Lee Dec 21 '22 at 07:50