Make an Emacs frame fullscreen (no caption or window borders) on Windows.

gistfile1.py

"""Make the Emacs window full-screen on Windows

At present, this will only adjust the first Emacs frame found. It could be modified to use
win32api.EnumWindows and win32api.GetClassName / win32api.GetWindowText in order to adjust all
Emacs frames.
"""

import argparse
import sys
import win32gui
import win32con


def set_borderless(hwnd, off=False):
    """Turn off / on titlebar and border"""

    borderless_style = (win32con.WS_BORDER | win32con.WS_THICKFRAME
                        | win32con.WS_CAPTION | win32con.WS_MAXIMIZE)
    current_style = win32gui.GetWindowLong(hwnd, win32con.GWL_STYLE)
    if off:
        style = current_style | borderless_style
    else:
        style = current_style & ~borderless_style

    win32gui.SetWindowLong(hwnd, win32con.GWL_STYLE, style)


def main():
    parser = argparse.ArgumentParser()
    parser.add_argument("--off", action="store_true", help="Turn off full-screen mode")
    args = parser.parse_args()
    
    # Find first Window with class of "Emacs"
    emacs_hwnd = win32gui.FindWindowEx(None, None, "Emacs", None)
    if not emacs_hwnd:
        print("No Emacs window found")
        return 1
    set_borderless(emacs_hwnd, args.off)


if __name__ == "__main__":
    sys.exit(main())