How to simulate the Spacebar keystroke in Python 3 on Windows?

  • Meaning to emulate? Send spacebar message to any window? Write the specific problem you want to solve - Flowneee
  • This is all done for the game, in the game the space gap is a shot, it is necessary that the program with certain intervals press it - Golovanenko Victor
  • That is, you need to send a message about the pressed space to another program, I understand correctly? - Flowneee

1 answer 1

In general, there are 2 ways. First: use the PyWin32 library. Second, directly use WinAPI functions from Windows libraries (User32.dll in this case). I chose the second path, since I did not have a PyWin32 library in pip in Python3.6.

from ctypes import * import sys is_64bit_arch = sys.maxsize > 2**32 # здесь определяется разрядность архитектуры # ниже я просто определили необходимые типы для удобства LONG_PTR = c_longlong if is_64bit_arch else c_long UINT_PTR = c_ulonglong if is_64bit_arch else c_uint UINT = c_uint HANDLE = c_void_p WPARAM = UINT_PTR LPARAM = LONG_PTR LRESULT = LONG_PTR HWND = HANDLE LPCSTR = c_char_p DWORD = c_ulong WORD = c_ushort SendMessage = windll.user32.SendMessageA FindWindow = windll.user32.FindWindowA MapVirtualKey = windll.user32.MapVirtualKeyA # непосредственно функция, которая принимает виртуальный код клавиши # https://msdn.microsoft.com/en-us/library/windows/desktop/dd375731(v=vs.85).aspx def press_key(key_vk, window_title): c_window_title = LPCSTR(window_title.encode('utf-8')) WM_KEYUP = UINT(0x0101) WM_KEYDOWN = UINT(0x0100) wParam = WPARAM(key_vk) key_sc = MapVirtualKey(key_vk, 0) lParam = LPARAM(0x1 | (key_sc << 16)) lParamDown = LPARAM(1 + (key_sc << 16) + (1 << 30)) lParamUp = LPARAM(1 + (3 << 30) + (key_sc << 16)) # находим хендл окна handle = FindWindow(LPCSTR(), c_window_title) # отправляем сообщение о нажатии клавиши SendMessage(handle, WM_KEYDOWN, wParam, lParamDown) # отправляем сообщение об отпускании клавиши return SendMessage(handle, WM_KEYUP, wParam, lParamUp) # пример вызова функции. Код 0x20 это пробел. Как видите, я отправлял # сообщение в плеер, и видео останавливалось и продолжалось :) press_key(0x20, "House of Cards S05E13 - VLC media player")

The actual documentation for the necessary functions can be found on MSDN: SendMessage , MapVirtualKey , FindWindow .