Simulating a click in the game window

Question

The problem is that I already have a working program that sends a click to an inactive window that is not on TOPLEVEL, but it does not work with all windows. And I cannot understand what is the reason for this behavior. When I filter messages with spy ++, they are exactly the same as with a real mouse click, but in the end the game does not respond.

Initially, I coded it in python, but in the end it didn't work out for me and I decided to try C ++, despite the fact that I have no experience. Here's what I managed to put together in C ++.

#include <stdio.h>
#include <cstdlib>
#include <windows.h>
#include <winuser.h>
#include <conio.h>

LPCTSTR WindowName = L"Raid: Shadow Legends";
HWND hMU = FindWindow(NULL, WindowName);
int main() {
    if (hMU)
    {
        int x = 16; //selected values based on the readings of spy ++
        int y = 266; //
        WINDOWPOS wp = { hMU, NULL, 0, 0, 0, 0, SWP_NOSIZE | SWP_NOMOVE };
        
        SendMessage(hMU, WM_SETCURSOR, (WPARAM)hMU, MAKELPARAM(HTCLIENT, WM_MOUSEMOVE));
        SendMessage(hMU, WM_MOUSEACTIVATE, (WPARAM)hMU, MAKELPARAM(HTCLIENT, WM_LBUTTONDOWN));
        SendMessage(hMU, WM_WINDOWPOSCHANGING, 0, (LPARAM)& wp);
        SendMessage(hMU, WM_NCPAINT, 1, 0);
        SendMessage(hMU, WM_WINDOWPOSCHANGED, 0, (LPARAM)& wp);
        SendMessage(hMU, WM_ACTIVATEAPP, 1, 0);
        SendMessage(hMU, WM_NCACTIVATE, 1, 0);
        SendMessage(hMU, WM_ACTIVATE, WA_CLICKACTIVE, 0);
        SendMessage(hMU, WM_SETFOCUS, 0, 0);
        SendMessage(hMU, WM_SETCURSOR, (WPARAM)hMU, MAKELPARAM(HTCLIENT, WM_LBUTTONDOWN));
        PostMessage(hMU, WM_LBUTTONDOWN, MK_LBUTTON, MAKELPARAM(x, y));
        PostMessage(hMU, WM_LBUTTONUP, MK_LBUTTON, MAKELPARAM(x, y));
        SendMessage(hMU, WM_CAPTURECHANGED, 0, 0);
    }
}

The code is probably redundant or even bad, but I don't pay attention to it. I followed the path of exact copying of messages on mouse click. Sorry for this. I will accept any help. Also a Python solution would be nice.

@Sam Varshavchik It is possible. Interestingly, this same game completely accepts my code with simulated keystrokes, but it does not work with simulated mouse clicks. — D3-one 6, Jul 21 '20 at 21:52
There is more to simulating input than just sending window messages (and FYI, some of those messages need to be *posted* with `PostMessage()`, not *sent* with `SendMessage()`). The correct way to simulate input is with `SendInput()`, but that won't work if the coordinates of the simulated input are covered up by another window. Does the game's window react to UIAutomation instead? — Remy Lebeau, Jul 21 '20 at 22:19

score 0 · Answer 1 · answered Jul 22 '20 at 02:36

0

I recommend you to use SendInput to send the corresponding message to the game window.

You can refer to:How to simulate mouse click in a Directx game.

You can position the focus to the corresponding window by using AttachThreadInput, SetForegroundWindow SetActiveWindow and SetFocus.

Then send the specified message through SendInput.

answered Jul 22 '20 at 02:36

Zeus

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[AttachThreadInput is like taking two threads and pooling their money into a joint bank account, where both parties need to be present in order to withdraw any money](https://devblogs.microsoft.com/oldnewthing/20130619-00/?p=4043). [I warned you: The dangers of attaching input queues](https://devblogs.microsoft.com/oldnewthing/20080801-00/?p=21393). [Sharing an input queue takes what used to be asynchronous and makes it synchronous, like focus changes](https://devblogs.microsoft.com/oldnewthing/20130607-00/?p=4143). – IInspectable Jul 22 '20 at 05:41
yes, but I need the window to remain in the same position, that is, so that it does not appear in front – D3-one 6 Jul 22 '20 at 15:36
@D3-one6 I think the games uses DirectInput so you can't use SendMessage to send mouse events or keyboard events to it.So you can refer to https://stackoverflow.com/questions/24735029/directx-game-hook – Zeus Jul 23 '20 at 02:30

Simulating a click in the game window

1 Answers1