exchange.GetTicker

获取当前设置的交易对、合约代码对应的{@struct/Ticker Ticker}结构，即行情数据。GetTicker()函数是交易所对象{@var/EXCHANGE exchange}的成员函数，exchange对象的成员函数（方法）的用途只和exchange相关，文档之后不再赘述。

{@struct/Ticker Ticker} / 空值


exchange.GetTicker()
exchange.GetTicker(symbol)

参数```symbol```用于指定请求的{@struct/Ticker Ticker}数据对应的合约代码。不传该参数时默认请求当前设置的合约代码的行情数据。

symbol
false
string

```javascript
function main(){
    // 鉴于测试代码，不使用商品期货策略一般架构，这里仅仅判断exchange.IO("status")函数，判断连接期货公司前置机成功后立即执行测试代码。股票证券无需使用exchange.IO("status")判断连接状态
    while(!exchange.IO("status")) {
        Sleep(1000)
    }
    Log(exchange.SetContractType("rb888"))

    var ticker = exchange.GetTicker()
    Log("Symbol:", ticker.Symbol, "High:", ticker.High, "Low:", ticker.Low, "Sell:", ticker.Sell, "Buy:", ticker.Buy, "Last:", ticker.Last, "Open:", ticker.Open, "Volume:", ticker.Volume)
}

def main():
    while not exchange.IO("status"):
        Sleep(1000)
    Log(exchange.SetContractType("rb888"))

    ticker = exchange.GetTicker()
    Log("Symbol:", ticker["Symbol"], "High:", ticker["High"], "Low:", ticker["Low"], "Sell:", ticker["Sell"], "Buy:", ticker["Buy"], "Last:", ticker["Last"], "Open:", ticker.Open, "Volume:", ticker["Volume"])

void main() {
    while(exchange.IO("status") == 0) {
        Sleep(1000);
    }
    Log(exchange.SetContractType("rb888"));

    auto ticker = exchange.GetTicker();
    Log("Symbol:", ticker.Symbol, "High:", ticker.High, "Low:", ticker.Low, "Sell:", ticker.Sell, "Buy:", ticker.Buy, "Last:", ticker.Last, "Open:", ticker.Open, "Volume:", ticker.Volume);
}

测试exchange.GetTicker()函数：

回测系统中exchange.GetTicker()函数返回的Ticker数据，其中High、Low为模拟值，取自当时盘口的卖一、买一。

商品期货策略实盘中如果没有行情推送过来时，exchange.GetTicker()函数会阻塞，等待行情推送。exchange.GetDepth()、exchange.GetTrades()、exchange.GetRecords()同理。如果不希望阻塞可以使用切换行情模式：

• exchange.IO(“mode”, 0) 立即返回模式，如果当前还没有接收到交易所最新的行情数据推送，就立即返回旧的行情数据，如果有新的数据就返回新的数据。
• exchange.IO(“mode”, 1) 缓存模式（默认模式），如果当前还没有收到交易所最新的行情数据（同上一次接口获取的数据比较），就等待接收然后再返回，如果调用该函数之前收到了最新的行情数据，就立即返回最新的数据。
• exchange.IO(“mode”, 2) 强制更新模式，进入等待一直到接收到交易所下一次的最新推送数据后返回。

实盘时（非回测）exchange.GetTicker()函数的返回值中Info属性储存接口调用时返回的原始数据。

• 商品期货 返回商品期货CTP协议/易盛协议接口应答数据，以CTP协议为例：

  
  {
    "BidPrice4": 1.7976931348623157e+308,
    "AskVolume4": 0,
    "AskVolume5": 0,
    "Turnover": 26229625880,
    "OpenInterest": 1364847,                  // 持仓量
    "ClosePrice": 1.7976931348623157e+308,
    "LowerLimitPrice": 3473,
    "BidPrice3": 1.7976931348623157e+308,
    "ExchangeID": "",
    "BidPrice2": 1.7976931348623157e+308,
    "BidPrice5": 1.7976931348623157e+308,
    "AveragePrice": 37323.89130239898,
    "BidVolume4": 0,
    "BidVolume5": 0,
    "ExchangeInstID": "",
    "LowestPrice": 3715,
    "Volume": 702757,
    "BidVolume3": 0,
    "AskPrice3": 1.7976931348623157e+308,
    "AskVolume3": 0,
    "ActionDay": "20200714",
    "PreClosePrice": 3739,
    "SettlementPrice": 1.7976931348623157e+308,
    "UpdateTime": "13:40:01",
    "BidPrice1": 3727,
    "AskPrice2": 1.7976931348623157e+308,
    "UpperLimitPrice": 3996,
    "CurrDelta": 1.7976931348623157e+308,
    "UpdateMillisec": 500,
    "AskVolume1": 154,
    "BidVolume2": 0,
    "PreOpenInterest": 1372843,
    "PreDelta": 0,
    "AskPrice1": 3728,
    "AskVolume2": 0,
    "TradingDay": "20200714",
    "InstrumentID": "rb2010",
    "LastPrice": 3727,
    "HighestPrice": 3749,
    "BidVolume1": 444,
    "PreSettlementPrice": 3735,
    "OpenPrice": 3740,
    "AskPrice4": 1.7976931348623157e+308,
    "AskPrice5": 1.7976931348623157e+308
  }
  

{@fun/Market/exchange.GetDepth exchange.GetDepth}, {@fun/Market/exchange.GetTrades exchange.GetTrades}, {@fun/Market/exchange.GetRecords exchange.GetRecords}