C++ Channel函数代码示例

CAMLprim value caml_ml_flush_partial(value vchannel)
{
  CAMLparam1 (vchannel);
  struct channel * channel = Channel(vchannel);
  int res;

  if (channel->fd == -1) CAMLreturn(Val_true);
  Lock(channel);
  res = caml_flush_partial(channel);
  Unlock(channel);
  CAMLreturn (Val_bool(res));
}

CAMLprim value caml_ml_output_partial(value vchannel, value buff, value start,
                                      value length)
{
  CAMLparam4 (vchannel, buff, start, length);
  struct channel * channel = Channel(vchannel);
  int res;

  Lock(channel);
  res = caml_putblock(channel, &Byte(buff, Long_val(start)), Long_val(length));
  Unlock(channel);
  CAMLreturn (Val_int(res));
}

void MainWindow::onAddChannelButtonPressed()
{
    if (m_session.isValid())
    {
        QString name = ui->channelNameEdit->text();
        QString description = ui->channelDescriptionEdit->text();
        QString url = ui->channelUrlEdit->text();

        m_applyChannelQuery->setQuery(Channel(name,description,url),m_session);
        m_applyChannelQuery->doRequest();
    }
}

int main(void)
  {
    int i, j;
    unsigned short CRC_Xmit;
    unsigned short CRC_Recv;
    int Detected_Count = 0;
    int Okay_Count     = 0;

    /* Initialize. */
    for (i = 0; i < 1024; i++) {
      Raw_Data[i] = (unsigned char)i;
    }
    CRC_Xmit = CRC_Clear();
    Initialize_Noise(1.0e-5);

    /* Compute the CRC checksum. */
    for (i = 0; i < 1024; i++) {
      CRC_Xmit = CRC_Update(CRC_Xmit, Raw_Data[i]);
    }
    CRC_Xmit = CRC_Finish(CRC_Xmit);

    /* Now loop many times sending the block of data through the channel. */
    for (i = 0; i < 1024; i++) {
      CRC_Recv = CRC_Clear();

      for (j = 0; j < 1024; j++) {
        CRC_Recv = CRC_Update(CRC_Recv, Channel(Raw_Data[j]));
      }
      CRC_Recv = CRC_Update(CRC_Recv, Channel((CRC_Xmit & 0xFF00) >> 8));
      CRC_Recv = CRC_Update(CRC_Recv, Channel(CRC_Xmit & 0x00FF));

      if (CRC_Recv != 0) Detected_Count++;
        else Okay_Count++;
    }

    printf("Blocks with detected errors: %d\n", Detected_Count);
    printf("Blocks okay: %d\n", Okay_Count);

    return 0;
  }

SensorDataSet SensorDB::ExecuteSQL_SelectFromSensorDataTable(std::string sqlcommand)
{
    SensorDataSet ds;
	ChannelList channelist;
    int channel_num;
    int datatype_id;
    int operator_id;
    int device_id;
    int position_id;
    int activity_id;
    int activitybeginframe_id;
    int activityendframe_id;
    double samplerate;
    QDateTime createtime;
    if(db.isOpen()){
        QSqlQuery query;
        QString sqlcmd = string2qstring(sqlcommand);
        if(query.exec(sqlcmd)){
                while(query.next()){
					datatype_id = query.value("DataTypeID").toInt();
                    activity_id = query.value("ActivityID").toInt();
                    device_id = query.value("DeviceID").toInt();
                    operator_id = query.value("OperatorID").toInt();
                    position_id = query.value("PositionID").toInt();
                    activitybeginframe_id = query.value("ActivityBeginFrameID").toInt();
                    activityendframe_id = query.value("ActivityEndFrameID").toInt();
                    samplerate = query.value("SampleRate").toDouble();
                    createtime = query.value("CreateTime").toDateTime();
					channel_num = query.value("TotalChannelNum").toInt();
					channelist.clear();
					for(int i=1;i<=channel_num;i++){
                        if(query.value(i).isNull()){
                            break;
                        }					
						string ch = "channel_"+int2string(i);						
						//qDebug() << query.value(string2qstring(ch.c_str())).toString();
						channelist.push_back(Channel(query.value(string2qstring(ch.c_str())).toString().toStdString()));
						//qDebug() << string2qstring((channelist[channelist.size()-1].ToString()));
					}
					ds.PushBackSensorData(SensorData(channelist,channel_num,datatype_id,operator_id,device_id,position_id,
                                         activity_id,activitybeginframe_id,activityendframe_id, samplerate,createtime));
                }
        }
        else{
            qDebug()<<query.lastError();
        }
    }
    else{
        qDebug()<<"DataBase is not opened";
    }
    return ds;
}

/* converts a Caml channel to a C FILE* stream */
static FILE * stream_of_channel(value chan, const char * mode) {
    int des;
    FILE * res ;
    struct channel *c_chan = Channel(chan) ;
    if(c_chan==NULL)
        return NULL;
    des = dup(c_chan->fd) ;
    res = fdopen(des, mode) ;
    if (des < 0 || res == NULL) {
        caml_failwith("failed to duplicate caml channel");
    }
    return res ;
}

CAMLprim value caml_ml_input_int(value vchannel)
{
  CAMLparam1 (vchannel);
  struct channel * channel = Channel(vchannel);
  intnat i;

  Lock(channel);
  i = caml_getword(channel);
  Unlock(channel);
#ifdef ARCH_SIXTYFOUR
  i = (i << 32) >> 32;          /* Force sign extension */
#endif
  CAMLreturn (Val_long(i));
}

 void OutgoingResourceLimiter::ForwardMessage(string_t type, uint160 hash)
 {
     if (type == "tx")
         return ForwardTransaction(hash);
     string_t channel = Channel(type);
     with_msg_as_instance_of_(type, hash,
         if (channel == "trade")
             flexnode.tradehandler.BroadcastMessage(msg);
         else if (channel == "relay")
             flexnode.relayhandler.BroadcastMessage(msg);
         else if (channel == "deposit")
             flexnode.deposit_handler.BroadcastMessage(msg);
         )
 }

// returns a status message regarding the successful or unsuccesful
//    creation of a channel
std::string IRCCommandHandler::createChannel() {
  // CREATECHANNEL channelname username
  std::string channel {arguments[0]};
  std::string user    {arguments[1]};

  std::string result;
  if (channels.count(channel) || channel == "server") {
    result = "Error: Channel '"+channel+"' already exists";
  }
  else {
    channels.emplace(channel, Channel(channel));
    channels.at(channel).addUser(user);
    result = "Successfully created channel '"+channel+"'";
  }
  return result;
}

boost::system::error_code RtspService::createChannel(uint32_t uiChannelId, const std::string& sChannelName, const AudioChannelDescriptor& audioDescriptor)
{
  VLOG(2) << "createChannel: " << uiChannelId;
  boost::mutex::scoped_lock l(m_channelLock);
  ChannelMap_t::iterator it = m_mChannels.find(uiChannelId);
  if (it != m_mChannels.end())
  {
    return boost::system::error_code(boost::system::errc::file_exists, boost::system::get_generic_category());
  }
  else
  {
    m_qChannelsToBeAdded.push_back(Channel(uiChannelId, sChannelName, audioDescriptor));
    return boost::system::error_code();
  }
  return boost::system::error_code();
}

    string SimulateRead(const SequencingParameters& p,
                        const std::string& tpl,
                        RandomNumberGenerator& rng)
    {
        std::string read;
        read.reserve(tpl.length() * 2);

        int pos = 0;
        while (pos < (int)tpl.length())
        {
            char base = tpl[pos];
            char prevBase = pos > 0 ? tpl[pos-1] : 'N';
            int channel = Channel(base);

            //
            // Tabulate the different possible move probabilities, then choose one
            //
            bool canMerge =  base == prevBase;
            vector<double> errorProbs = ErrorProbs(p, channel, canMerge);
            int choice = rng.RandomChoice(errorProbs);

            if (choice == (int) errorProbs.size() - 1) {  // Match
                read.push_back(base);
                pos++;

            } else if (choice < 4) {                     // Insert
                vector<double> insertProbs = vector<double>(errorProbs.begin(),
                                                            errorProbs.begin() + 4);
                int eChannel = rng.RandomChoice(insertProbs);
                char eBase = "TGAC"[eChannel];
                read.push_back(eBase);

            } else if (choice == 4) {                   // Dark
                pos++;

            } else if (choice == 5) {                   // Miscall
                read.push_back(rng.RandomBase());
                pos++;

            } else {                                   // Merge
                assert (canMerge);
                pos++;
            }
        }

        return read;
    }

CAMLprim value win_filedescr_of_channel(value vchan)
{
  CAMLparam1(vchan);
  CAMLlocal1(fd);
  struct channel * chan;
  HANDLE h;

  chan = Channel(vchan);
  if (chan->fd == -1) uerror("descr_of_channel", Nothing);
  h = (HANDLE) _get_osfhandle(chan->fd);
  if (chan->flags & CHANNEL_FLAG_FROM_SOCKET)
    fd = win_alloc_socket((SOCKET) h);
  else
    fd = win_alloc_handle(h);
  CRT_fd_val(fd) = chan->fd;
  CAMLreturn(fd);
}

void TransportStreamFilter::SetStatus(bool On) {
    cFilter::SetStatus(On);
#if VDRVERSNUM <= 10327
#error "Unfortunately, VDR versions up to 1.3.27 contain a bug that prevents this code from working properly. Please use VDR version 1.3.28 or later."
#endif
    //printf("TransportStreamFilter::SetStatus , status is %d, On is %d\n", status, On);
    TransportStreamID currentTs=TransportStream(Channel()).GetTransportStreamID();
    if (On) {
        switch (status) {
        case TransportStreamUnknown:
            ts=currentTs;
            status=Active;
            AddFilterData();
            break;
        case Active:
            break; // should not happen
        case Inactive:
        case OnOtherTransportStream:
            if (currentTs == ts) {
                status=Active;
                AddFilterData();
            } else {
                status=OnOtherTransportStream;
                OtherTransportStream(currentTs);
            }
            break;
        case Deactivated:
            break;
        }
    } else {
        switch (status) {
        case TransportStreamUnknown:
            break;
        case Active:
            status=Inactive;
            RemoveFilterData();
            break;
        case Inactive:
        case OnOtherTransportStream:
            break;
        case Deactivated:
            break;
        }
    }
    //printf("TransportStreamFilter::SetStatus, leaving, status is %d\n", status);
}

CAMLprim value caml_ml_output(value vchannel, value buff, value start,
                              value length)
{
  CAMLparam4 (vchannel, buff, start, length);
  struct channel * channel = Channel(vchannel);
  intnat pos = Long_val(start);
  intnat len = Long_val(length);

  Lock(channel);
    while (len > 0) {
      int written = caml_putblock(channel, &Byte(buff, pos), len);
      pos += written;
      len -= written;
    }
  Unlock(channel);
  CAMLreturn (Val_unit);
}

Channel Channel::downsampleEnergy(unsigned factor) const
{
	if(factor>0)
	{
		unsigned newSize=data.size()/factor;
		std::vector<float> target=std::vector<float>(newSize);
		float acc;
		for(unsigned i=0,j=0;j<newSize;j++)
		{
			acc=0;
			for(unsigned k=0;k<factor && i<data.size();k++)
				acc+=sqr(data[i++]);
			target[j]=sqrt(acc/factor);
		}
		return Channel(rate/factor,target);
	} else
		return *this;
}