messagehook.cpp

#define STRICT
#include <windows.h>

#define MY_NORTIFY_MOUSE (WM_APP + 100)
#define MY_NORTIFY_KEY (WM_APP + 101)

HINSTANCE hInstDLL;

#pragma data_seg(".sharedata")
HWND hWndtgt = NULL;
HHOOK hhook;
#pragma data_seg()


int WINAPI DllMain(HINSTANCE hInstance, DWORD dwNotification, LPVOID lpReserved) {
  UNREFERENCED_PARAMETER(hInstance);
  UNREFERENCED_PARAMETER(lpReserved);

  hInstDLL = hInstance;
  return TRUE;
}


LRESULT CALLBACK hookproc(INT hc, WPARAM wParam, LPARAM lParam) {
  if (hc >= 0) {
    if (hc == HC_ACTION) {
      PMSG pmesg = (PMSG)lParam;

      switch (pmesg->message) {
      case WM_LBUTTONDOWN:
        PostMessage(hWndtgt, MY_NORTIFY_MOUSE, pmesg->message, pmesg->lParam);
        break;

      case WM_KEYDOWN:
        PostMessage(hWndtgt, MY_NORTIFY_KEY, pmesg->message, pmesg->wParam);
        break;
      }
    }
  }
  return CallNextHookEx(hhook, hc, wParam, lParam);
}


int makehook(HWND hWnd) {
  hWndtgt = hWnd;

  hhook = SetWindowsHookEx(WH_GETMESSAGE, (HOOKPROC)hookproc, hInstDLL, 0);
  if (hhook == NULL) {
    return -1;
  }
  return 0;
}


void unhook(void) {
  if (hhook != NULL) {
    UnhookWindowsHookEx(hhook);
  }
}