C / C++ / MFC

FILETIME start, end;
SYSTEMTIME st;

GetSystemTime(&st);
SystemTimeToFileTime(&st, &start);
    // Do some processing here....
GetSystemTime(&st);
SystemTimeToFileTime(&st, &end);
ULARGE_INTEGER time_start = *(ULARGE_INTEGER*)&start;
ULARGE_INTEGER time_end   = *(ULARGE_INTEGER*)&end;

__int64 i64time_start    = *(__int64 *)&time_start;
__int64 i64time_end      = *(__int64 *)&time_end;
__int64 i64time_diff_ns  = i64time_end - i64time_start; // in 100 nano seconds
__int64 i64time_diff_ms  = i64time_diff_ns / 10 / 1000; // in milli seconds
__int64 i64time_diff_sec = i64time_diff_ms / 1000;      // in seconds

char strdest_diff_ms[32];
char strdest_diff_sec[32];
_i64toa(i64time_diff_sec, strdest_diff_sec, 10);
_i64toa(i64time_diff_ms - i64time_diff_sec * 1000, strdest_diff_ms, 10);
char buffer[200];
char msg[] = "Time difference is %s.%s second(s).";
sprintf(buffer, msg, strdest_diff_sec, strdest_diff_ms);
::MessageBox(NULL, buffer, "Time Run Results", MB_ICONASTERISK |
               MB_ICONINFORMATION);

HWND hWndBrowser = ::GetAncestor(m_hWnd, GA_ROOT);
char szBuf[4096];
IShellBrowser *pISB = (IShellBrowser*)SendMessage(hWndBrowser, WM_USER+7, 0, NULL);
if (pISB)
{
	IShellView *pISV = NULL;
	if (SUCCEEDED(pISB->QueryActiveShellView(&pISV)))
	{
		IDataObject *pIDO;
		HDROP hDrop;
		UINT      uNumFiles;
		char szFile[MAX_PATH];
		pISV->GetItemObject(SVGIO_SELECTION, IID_IDataObject, (void**)&pIDO);
		FORMATETC etc = { CF_HDROP, NULL, DVASPECT_CONTENT, -1, TYMED_HGLOBAL };
		STGMEDIUM stg = { TYMED_HGLOBAL };

		if ( FAILED( pIDO->GetData ( &etc, &stg )))
				return E_INVALIDARG;
		hDrop = (HDROP) GlobalLock ( stg.hGlobal );
		if ( !hDrop )
		{
			ReleaseStgMedium ( &stg );
			return E_INVALIDARG;
		}
		uNumFiles = DragQueryFile ( hDrop, 0xFFFFFFFF, NULL, 0 );
		szBuf[0] = '\0';
		for (UINT uFile = 0; uFile < uNumFiles; uFile++)
		{
			if (!DragQueryFile( hDrop, uFile, szFile, MAX_PATH ))
				continue;
			wsprintf(szBuf, "%s\n%s", szBuf, szFile);
		}

		MessageBox(lpcmi->hwnd, szBuf, "Selected Files", MB_OK);


		GlobalUnlock ( stg.hGlobal );
		ReleaseStgMedium ( &stg );

		pIDO->Release();
		pISV->Release();
	}
}