sending key to inactive window

[fear-x]

im a newbie with c++ today and im trying to make a dll to send key to inactive window but i tryed calling it and nothing gets sent dont know if i call it right or not .

DLL:

#include "main.h"
#include <windows.h>

// a sample exported function
int DLL_EXPORT SendMessage(int x = 0){
    //HWND Client = FindWindow(0, "D3D Window");
    HWND hwnd = FindWindow("D3D Window", NULL);


  //  SendInput(hwnd, '2');
    SendMessage(hwnd, WM_KEYDOWN, VK_F4, 0);
    Sleep(300);
    SendMessage(hwnd, WM_KEYUP, VK_F4, 0);
    return x;

  //  PostMessage(hwnd, WM_KEYDOWN, 0x43, 0);
 //     PostMessage(hwnd, WM_CHAR, (WPARAM)'C', 0);
 //     PostMessage(hwnd, WM_KEYUP, 0x43, 0);

//      cout << "pressed" << endl;
	MessageBox(0, "Join us at Inferno Dev!", "DLL Message", MB_OK | MB_ICONINFORMATION);
    return x;
}

BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
{
    switch (fdwReason)
    {
        case DLL_PROCESS_ATTACH:
            // attach to process
            // return FALSE to fail DLL load
            break;

        case DLL_PROCESS_DETACH:
            // detach from process
            break;

        case DLL_THREAD_ATTACH:
            // attach to thread
            break;

        case DLL_THREAD_DETACH:
            // detach from thread
            break;
    }
    return TRUE; // successful
}

AutoIt DLL CALL:

DllCall("test.dll", "none", 'SendMessage')

please help me how can i make the dll send a key to inactive window
tryed googling tutorials of c++ but nothing at all o.o

[XxharCs]

when u make a dll then u dont need the FindWindow function because, when you inject ur dll then dll "is" in the process..

switch (fdwReason)
    {
        case DLL_PROCESS_ATTACH:
            // attach to process
            // return FALSE to fail DLL load
            break;

are u creating the thread, if i may ask ??

doing something like this in the DLL_PROCESS_ATTACH:

CreateThread(0, 0, &BotThread , 0, 0, 0);

are u injecting the dll at all or what ?

AutoIt DLL CALL:
Code:

DllCall("test.dll", "none", 'SendMessage')

i mean yeah, you call the dll, but do you inject it ?

and try the SendInput function

if i missunderstood something, then correct me..

[fear-x]

ow i didnt know i must inject it

well how do i attach it to another process? so it would send keys to the game whilst inactive.

and apreciate your help.

[Dr. Coxxy]

you misunderstood everything.
he compiled it as dll and loaded it into his autoit project to use the exported function.

you dont need to inject it.

[XxharCs]

make an injector^^
or use some injectors that already exists, for example WinInject

Edit: Yeah Coxxy but he still need to load it from there in the process he want to or ?..

[fear-x]

i just want the dll to send specific key in each function in that dll :P posible?

[Dr. Coxxy]

he doesnt want to inject anything he just makes a library and exports the sendmessage function to use it in his autoit3 project.

@fear-x google, i have no clue about autoit, but afaik you can call the winapi directly.
so you won't need the dll.

[fear-x]

well with autoit it wont work thats the thing xtrap is blocking it

so i thought dll would do the trick...

[Dr. Coxxy]

very unlikely to work.

[fear-x]

anyway to make it work? even without dll ? :s i can make simple send to work or in c++ its keybd_event() but not to inactive window :/

[tnd0]

Sendkey (=SendMessage) doesnt work. A window has a message queue in which it peeks for messages, but it does not receive messages while inactive, to save CPU time. Plus, if your window is a game, it probably uses directinput which doesnt check the message queue anyway.

On a side-note; your signature is telling everyone that you have no idea of computer science.

[fear-x]

lol? my sig tells u wat? ;d

[Dr. Coxxy]

autoit is the death keyword for coding

EDIT:

Originally Posted by tnd0

Sendkey (=SendMessage) doesnt work. A window has a message queue in which it peeks for messages, but it does not receive messages while inactive, to save CPU time.

this is just wrong.
windows wont send normal windows messages anymore, but the messagepump is still active even if the window has not the focus.
if you place a message in the messagequeue via send/postmessage windows will reactivate the messagepump and the window will proceed the message.
but most likely the game/the anticheat has a check wether the window is ontop / the input is emulated.
or the game simply uses directinput.

[fear-x]

well the game has D3D Window and i know that D3D Windows are pain in the *** to work with

[tnd0]

if you place a message in the messagequeue via send/postmessage windows will reactivate the messagepump and the window will proceed the message.

yes, windows will do that. however, on a custom message loop you dont necessarily check any messages (if you suspend your window thread or check in a peekmessage loop for example).