C / C++ / MFC

Syouki_kou wrote:

when user click eject, it will get into my code

#include <DBT.H><br />
void		CFrame::WmDeviceChange(WPARAM w,LPARAM l)<br />
{<br />
	switch(w)<br />
	{<br />
		case DBT_CONFIGCHANGECANCELED:<br />
		break;<br />
		case DBT_CONFIGCHANGED:<br />
		break;<br />
		case DBT_DEVICEARRIVAL:<br />
		break;<br />
		case DBT_DEVICEQUERYREMOVE:<br />
		break;<br />
		case DBT_DEVICEQUERYREMOVEFAILED:<br />
		break;<br />
		case DBT_DEVICEREMOVECOMPLETE:<br />
			// here is the debug trap after the media has been removed<br />
			// no other event came up before or after eject the media<br />
		break;<br />
		case DBT_DEVICEREMOVEPENDING:<br />
		break;<br />
		case DBT_DEVICETYPESPECIFIC:<br />
		break;<br />
		case DBT_USERDEFINED:<br />
		break;<br />
		default:<br />
			TRACE("WmDeviceChange: 0x%04X\r\n",w);<br />
		break;<br />
	}<br />
}

<br />
LRESULT FAR PASCAL __WndProc(HWND h,int m,WPARAM w,LPARAM l)<br />
{<br />
  switch(m)<br />
  {<br />
    case WM_DEVICECHANGE:<br />
      // do your action here!<br />
    break;<br />
  }<br />
  return DefWindowProc(h,m,w,l);<br />
}<br />
<br />
void AnyFunction()<br />
{<br />
WNDCLASS	wc; memset(&wc,0,sizeof(wc));<br />
HWND		hwnd=0;<br />
wc.lpfnWndProc   = (WNDPROC)__WndProc; <br />
wc.hInstance     = GetModuleHandle(); <br />
wc.lpszClassName = "catchDeviceMsg";<br />
if(RegisterClass(&wc))<br />
  hwnd = CreateWindowEx(0,wc.lpszClassName,"",WS_OVERLAPPEDWINDOW,0,0,0,0,0,0,wc.hInstance,0); // invisible<br />
}