handle = CreateFile(port.c_str(), GENERIC_READ|GENERIC_WRITE, 0, 0, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0);
if(handle==INVALID_HANDLE_VALUE)
handle = CreateFile(port.c_str(), GENERIC_READ|GENERIC_WRITE, 0, 0, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0);
if(handle==INVALID_HANDLE_VALUE)