Simple windows modal dialog box using ctypes

windows_modal_dialog_box.py

import ctypes
  
# https://learn.microsoft.com/en-us/windows/win32/api/winuser/nf-winuser-messageboxa  
# Displays a modal dialog box that contains a system icon, a set of buttons, and 
# a brief application-specific message, such as status or error information. The
# message box returns an integer value that indicates which button the user clicked.

NULL = 0

# buttons
MB_ABORTRETRYIGNORE = 0x00000002
MB_CANCELTRYCONTINUE = 0x00000006
MB_HELP = 0x00004000
MB_OK = 0x00000000
MB_OKCANCEL = 0x00000001
MB_RETRYCANCEL = 0x00000005
MB_YESNO = 0x00000004
MB_YESNOCANCEL = 0x00000003

# icon  
MB_ICONEXCLAMATION = 0x00000030
MB_ICONWARNING = 0x00000030
MB_ICONINFORMATION = 0x00000040
MB_ICONASTERISK = 0x00000040
MB_ICONQUESTION = 0x00000020
MB_ICONSTOP = 0x00000010
MB_ICONERROR = 0x00000010
MB_ICONHAND = 0x00000010

# return values
IDABORT = 3
IDCANCEL = 2
IDCONTINUE = 11
IDIGNORE = 5
IDNO = 7
IDOK = 1
IDRETRY = 4
IDTRYAGAIN = 10
IDYES = 6


def main():
    title = "Modal Dialog Box Title"
    message = "Message to be displayed."
    result = ctypes.windll.user32.MessageBoxExW(None, message, title, MB_OKCANCEL | MB_ICONINFORMATION)
    if result == IDOK:
        print("OK clicked")
    elif result == IDCANCEL:
        print("CANCEL clicked")
    else:
        print(f"{result=}")

if __name__ == "__main__":
    main()