exchange.GetTickers

```exchange.GetTickers()```函数请求数据成功时返回{@struct/Ticker Ticker}结构数组，请求数据失败时返回空值。              
{@struct/Ticker Ticker}数组、空值

exchange.GetTickers()

```javascript
/*backtest
start: 2024-07-01 00:00:00
end: 2024-07-07 00:00:00
period: 1m
basePeriod: 1m
exchanges: [{"eid":"Futures_CTP","currency":"FUTURES"}]
*/

function main() {
    var arrSymbol = ["rb2501", "MA888", "i2501", "p2501", "TA501"]
    var tbl = {type: "table", title: "test tickers", cols: ["Symbol", "Buy", "Sell", "Open", "Last", "High", "Low", "Volume", "Time", "OpenInterest"], rows: []}
    for (var i = 0; i < 10; i++) {
        if (exchange.IO("status")) {
            for (var symbol of arrSymbol) {
                exchange.SetContractType(symbol)
            }
            
            var tickers = exchange.GetTickers()
            for (var ticker of tickers) {                            
                tbl.rows.push([ticker.Symbol, ticker.Buy, ticker.Sell, ticker.Open, ticker.Last, ticker.High, ticker.Low, ticker.Volume, ticker.Time, ticker.OpenInterest])
            }
            
            LogStatus(_D(), "\n", "`" + JSON.stringify(tbl) + "`")
            return   
        }
        
        Sleep(1000)
    }
}

'''backtest
start: 2024-07-01 00:00:00
end: 2024-07-07 00:00:00
period: 1m
basePeriod: 1m
exchanges: [{"eid":"Futures_CTP","currency":"FUTURES"}]
'''

import json

def main():
    arrSymbol = ["rb2501", "MA888", "i2501", "p2501", "TA501"]
    tbl = {"type": "table", "title": "test tickers", "cols": ["Symbol", "Buy", "Sell", "Open", "Last", "High", "Low", "Volume", "Time", "OpenInterest"], "rows": []}
    for i in range(10):
        if exchange.IO("status"):
            for symbol in arrSymbol:
                exchange.SetContractType(symbol)
            
            tickers = exchange.GetTickers()
            for ticker in tickers:
                tbl["rows"].append([ticker["Symbol"], ticker["Buy"], ticker["Sell"], ticker["Open"], ticker["Last"], ticker["High"], ticker["Low"], ticker["Volume"], ticker["Time"], ticker["OpenInterest"]])
            
            LogStatus(_D(), "\n", "`" + json.dumps(tbl) + "`")
            return
        
        Sleep(1000)

/*backtest
start: 2024-07-01 00:00:00
end: 2024-07-07 00:00:00
period: 1m
basePeriod: 1m
exchanges: [{"eid":"Futures_CTP","currency":"FUTURES"}]
*/

void main() {
    auto arrSymbol = {"rb2501", "MA888", "i2501", "p2501", "TA501"};
    json tbl = R"({
        "type": "table", 
        "title": "test tickers", 
        "cols": ["Symbol", "Buy", "Sell", "Open", "Last", "High", "Low", "Volume", "Time", "OpenInterest"],
        "rows": []
    })"_json;
    for (int i = 0; i < 10; i++) {
        if (exchange.IO("status") == 1) {
            for (const auto& symbol : arrSymbol) {
                exchange.SetContractType(symbol);
            }
            auto tickers = exchange.GetTickers();
            for (auto& ticker : tickers) {
                json arrJson = {ticker.Symbol, ticker.Buy, ticker.Sell, ticker.Open, ticker.Last, ticker.High, ticker.Low, ticker.Volume, ticker.Time, ticker.OpenInterest};
                tbl["rows"].push_back(arrJson);
            }
            
            LogStatus(_D(), "\n", "`" + tbl.dump() + "`");
            return; 
        }
        
        Sleep(1000);
    }
}

在回测系统中调用exchange.GetTickers()函数，只返回已经订阅过的合约的聚合行情数据。

• exchange.GetTickers()函数支持实盘、回测系统。
• exchange.GetTickers()函数只返回已订阅过的品种的相关数据。

{@struct/Ticker Ticker}, {@fun/Market/exchange.GetTicker exchange.GetTicker}