Add an option to use PostMessage for minimized keystrokes

[Francesco149]

Some games will register keystrokes from PostMessage which sends a keystroke only to a certain window, even if it's hidden or minimized. This could avoid using a VM to stream certain games. I used to use this to make MMO bots to keep using your PC even while you're botting.

c++ example:

HWND wnd = FindWindow(0, "VisualBoyAdvance");
UINT key = 0x31; // 1 key
PostMessage(wnd, WM_KEYDOWN, key, MapVirtualKey(key, 0) << 16);
Sleep(150);
PostMessage(wnd, WM_KEYUP, key, MapVirtualKey(key, 0) << 16);

[tcsnyder]

here is code a simple text entry system that will let you use the keyboard. I don't have time to integrate it into the git, but here is my sample.

import win32con
import win32api
import win32gui

def enumHandler(hwnd, lParam):
    if win32gui.IsWindowVisible(hwnd):
        if 'testwindowinfo' in win32gui.GetWindowText(hwnd):
            for c in "Hello World\n":
                win32api.PostMessage(
                                    hwnd, 
                                    win32con.WM_CHAR, 
                                    ord(c), 
                                    0)             

win32gui.EnumWindows(enumHandler, None)

This finds a window with the name 'testwindowinfo' in it and posts 'Hello World' to it

[ynohtna92]

Why does it only work for certain games and not all? Is it an emulator limitation or a game issue?

That being said I will add this into my fork.

[Francesco149]

I think it depends on how the game handles the input. For example, it doesn't work for VisualBoyAdvance (which also seems to have system-wide input, as it will register input from other windows even when minimized), but it works on MapleStory. I think it only works on games or engines that use the win32 message loop to handle input but I'm not entirely sure.

[ynohtna92]

Your solution @tcsnyder in your fork produces errors.

      win32gui.EnumWindows(self.enumHandler, winlist)
    TypeError: enumHandler() takes exactly 2 arguments (3 given)

[ynohtna92]

@Francesco149 @tcsnyder I have posted my solution but it doesn't seem to register a post message.

[Francesco149]

It only works with games that use the Win32 message queue to process keystrokes. So far I've only used it on bots for MapleStory.