Hooking with DLL a game hook

Question

My DLL

#include <windows.h>
#include <vector>
#include "Funkcje.h"

WNDPROC originalProc;
LRESULT CALLBACK myHookProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam);

BOOL WINAPI DllMain(
    HINSTANCE hinstDLL,
    DWORD fdwreason,
    LPVOID lpReversed)
{
    switch (fdwreason)
    {
    case DLL_PROCESS_ATTACH:
        WNDPROC originalProc = SetWindowLongPtr(getToplevelWindows()[1], GWLP_WNDPROC, (LONG_PTR)myHookProc);
        break;
    }

    return TRUE;
}

LRESULT CALLBACK myHookProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
    LRESULT originalResult = originalProc(hWnd, uMsg, wParam, lParam); // call original first
    if (uMsg == WM_PAINT)
    {
        PAINTSTRUCT ps;
        HDC hdc = GetDC(hWnd);
        TextOut(hdc, 150, 150, L"TEST", 4);
        ReleaseDC(hWnd, hdc);
    }
    return originalResult;
}

Funkcje.h http://pastebin.com/dc5t5H8s

I got a problem with (LONG_PTR)myHookProc My compilers says that error C2440: 'initializing' : cannot convert from 'LONG' to 'WNDPROC' I dont have any idea what i can do now. Without (LONG_PTR) my compiler says that he can't convert from 'LRESULT' to 'LONG'

Answer 1

Change the signature to:

LRESULT APIENTRY myHookProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)

And the call to:

WNDPROC originalProc = (WNDPROC)SetWindowLongPtr(getToplevelWindows()[1], GWLP_WNDPROC, (LONG_PTR)myHookProc);