C++ istream::flags方法代码示例

//=============================================================================
static string get_line_ (istream& in)
{
    string line;
    
    ios_base::fmtflags ff (in.flags());
    in.setf (ios_base::skipws);
    getline (in, line); 
    in.flags (ff);
    
    return line;
}

	bool SubRip::readFromStream(istream& is)
	{
		if ( !valid ) { clear(); }
		unsigned int sa, sb, sc, sd; //start times
		unsigned int ea, eb, ec, ed; //end times
		unsigned int num;
		bool go = true;
		auto flags = is.flags();
		char c, c1, c2;
		char cl[6];
		do {
			is >> skipws >> num >> sa;
			c = is.get(); if (c!=':') { valid = false; break; }
			is >> sb;
			c = is.get(); if (c!=':') { valid = false; break; }
			is >> sc;
			c = is.get(); if (c!=',') { valid = false; break; }
			is >> sd;
			is.get(cl, 6); if (strcmp(cl, " --> ")!=0) { valid = false; break; }
			is >> ea;
			c = is.get(); if (c!=':') { valid = false; break; }
			is >> eb;
			c = is.get(); if (c!=':') { valid = false; break; }
			is >> ec;
			c = is.get(); if (c!=',') { valid = false; break; }
			is >> ed;
			c1 = is.get(); c2 = is.get(); if ( c1!='\r' || c2!='\n') { valid = false; break; }
			is >> noskipws;
			string aggr;
			bool stop = false;
			while (!stop) {
				string temp;
				getline(is, temp, '\n'); temp.append("\n");
				if (temp.length() == 1) {
					go = false;
					break;
				}
				if (temp.length()==2) {
					stop = true;
				}
				aggr.append(temp);
			}

			int sTime = aggregateTimes(sa, sb, sc, sd);
			int eTime = aggregateTimes(ea, eb, ec, ed);
			
			nodes.push_back(make_pair(make_pair(sTime, eTime), aggr));
		} while (go);
		is.flags(flags);

		return valid;
	}

FeatureVectorListPtr  FeatureFileIO::LoadFile (const KKStr&      _fileName,
                                               FileDescConstPtr  _fileDesc,
                                               MLClassList&      _classes, 
                                               istream&          _in,
                                               OptionUInt32      _maxCount,    // Maximum # images to load.
                                               VolConstBool&     _cancelFlag,
                                               bool&             _changesMade,
                                               KKStr&            _errorMessage,
                                               RunLog&           _log
                                              )
{
  _errorMessage = "Driver '" + DriverName () + "' does not implemenet  'LoadFile'  method.";
  _log.Level (10) << endl
      << "FeatureFileIO::LoadFile   ***ERROR***   " << _errorMessage << endl
      << "    _fileName   : " << _fileName << endl
      << "    _fileDesc   : " << _fileDesc->NumOfFields () << endl
      << "    _classes    : " << _classes.ToCommaDelimitedStr () << endl
      << "    _in.flags   : " << _in.flags () << endl
      << "    _maxCount   : " << _maxCount << endl
      << "    _cancelFlag : " << _cancelFlag << endl
      << "    _changesMade: " << _changesMade << endl
      << endl;

  _errorMessage = "ROBERTS read functionality not implemented.";
  return NULL;
}

FileDescConstPtr  FeatureFileIO::GetFileDesc (const KKStr&    _fileName,
                                              istream&        _in,
                                              MLClassListPtr  _classes,
                                              kkint32&        _estSize,
                                              KKStr&          _errorMessage,
                                              RunLog&         _log
                                             )
{
  _errorMessage = "Driver '" + DriverName () + "' does not implemenet  'GetFileDesc'  method.";
  _log.Level (10) << endl 
      << "FeatureFileIO::GetFileDesc   ***ERROR***    " << _errorMessage << endl
      << "    _fileName: " << _fileName << endl
      << "    _in.flags: " << _in.flags () << endl
      << "    _classes : " << _classes->ToCommaDelimitedStr () << endl
      << "    _estSize : " << _estSize << endl
      << endl;
  _errorMessage = "ROBERTS read_estSize, functionality not implemented.";
  return NULL; 
}

int
__gmp_istream_set_base (istream &i, char &c, bool &zero, bool &showbase)
{
  int base;

  zero = showbase = false;
  switch (i.flags() & ios::basefield)
    {
    case ios::dec:
      base = 10;
      break;
    case ios::hex:
      base = 16;
      break;
    case ios::oct:
      base = 8;
      break;
    default:
      showbase = true; // look for initial "0" or "0x" or "0X"
      if (c == '0')
	{
	  if (! i.get(c))
	    c = 0; // reset or we might loop indefinitely

	  if (c == 'x' || c == 'X')
	    {
	      base = 16;
	      i.get(c);
	    }
	  else
	    {
	      base = 8;
	      zero = true; // if no other digit is read, the "0" counts
	    }
	}
      else
	base = 10;
      break;
    }

  return base;
}

short _Ipfx(istream& Is_, int noskip)
{
  if (Is_.good())
  {
    if (Is_.tie() != 0)
      Is_.tie()->flush();

    if (!noskip && Is_.flags() & ios::skipws)
    {
      int ch;
      while (isspace(ch = Is_.rdbuf()->sbumpc()))
	;
      if (ch != EOF)
	Is_.rdbuf()->sputbackc(ch);
    }

    if (Is_.good())
      return  1;
  }

  Is_.clear(ios::failbit);
  return 0;
}