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// Takes Gtk window handle and overrides WindowProc to listen on Hardware change messages
// Currently works on MSVC++ 2005 with Gtkmm and Gtk+
#include <gtk/gtk.h>
#include <gtkmm/main.h>
#include <gtkmm/label.h>
#include <gtkmm/window.h>
#include <gdk/gdkwin32.h>
#include <windows.h>
#include <dbt.h>

#include <iostream>

// Global -- Original Window Procedure
WNDPROC OldWinProc = NULL;

int DeviceArrival = 0;
int DeviceRemoval = 0;


// =================================================================================
// PROTOTYPE FUNCTIONS =============================================================
// =================================================================================

// Returns a Win32 HWND from the Gtk::Window
// requires <gtk/gtk.h>, <gtkmm/window.h>, <windows.h>, and <gdk/gdkwin32.h> headers
HWND gtkmm_win32_get_handle(Gtk::Window *Window);

int override_window_procedure(HWND & hWnd);

// New Window Procedure
LRESULT CALLBACK NewWndProc(HWND hwnd,
    UINT uMsg,
    WPARAM wParam,
    LPARAM lParam
);

// =================================================================================
// END PROTOTYPE FUNCTIONS =========================================================
// =================================================================================


int main(int argc, char *argv[])
{
   /*****************************************************************
   GtkWidget *window;
   gtk_init(&argc, &argv);

   window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
   gtk_window_set_title(GTK_WINDOW(window), "HWND TEST");
   gtk_widget_show_all(window);

   HWND hWnd = (HWND) gdk_win32_drawable_get_handle(window->window);
   if(!override_window_procedure(hWnd) )
   {
      std::cout << "override failed\n";
      std::cout << "GetLastError(): " << GetLastError() << "\n";
   }

   gtk_main();
   ******************************************************************/


   Gtk::Main kit(argc, argv);

   Gtk::Window *window = new Gtk::Window();

   window->set_title("Hello World");
   window->show_all();

   HWND hWnd = gtkmm_win32_get_handle(window);
   if(!override_window_procedure(hWnd) )
   {
      std::cout << "override failed\n";
      std::cout << "GetLastError(): " << GetLastError() << "\n";
      exit(-1);
   }

   Gtk::Main::run(*window);

   return 0;
}


// =================================================================================


LRESULT CALLBACK NewWndProc(HWND hwnd,
    UINT uMsg,
    WPARAM wParam,
    LPARAM lParam
)
{
   if (uMsg == WM_DEVICECHANGE)
   {

      switch (wParam)
      {
      case DBT_DEVICEARRIVAL: std::cout << "Device New: " << ++DeviceArrival << "\n";
         break;
      case DBT_DEVICEREMOVECOMPLETE: std::cout << "Device Gone: " << ++DeviceRemoval << "\n";
         break;
      };

   }
   return CallWindowProc(OldWinProc,hwnd,uMsg,wParam,lParam);
}


inline HWND gtkmm_win32_get_handle(Gtk::Window * Window)
{
   // window must be visible to grab gobj()
   if (!Window->is_visible())
      Window->show_all();

   return static_cast<HWND>(gdk_win32_drawable_get_handle(Window->get_window()->gobj()) );
}


int override_window_procedure(HWND & hWnd)
{
    OldWinProc = (WNDPROC)GetWindowLong(hWnd,GWL_WNDPROC);
   if(!OldWinProc) return (int)OldWinProc;
    return SetWindowLong(hWnd,GWL_WNDPROC,(LONG)(WNDPROC)NewWndProc);
}

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nShowCmd)
{
   return main(__argc, __argv);
}