python
    
    
def main():
    while not exchange.IO("status"):
        Sleep(1000)
    exchange.SetMaxBarLen(50)
    Log(exchange.SetContractType("rb888"))

    r = exchange.GetRecords()
    Log(len(r), r)

    rust
    
    
fn main() {
    // 由于是测试代码，未采用商品期货策略的通用架构，此处仅通过exchange.IO("status")函数判断成功连接期货公司前置机后立即执行测试代码。股票证券策略无需使用exchange.IO("status")判断连接状态
    while exchange.IO("status").unwrap_or_default() != "true" {
        Sleep(1000);
    }
    exchange.SetMaxBarLen(50);
    Log!(exchange.SetContractType("rb888"));

    let records = exchange.GetRecords(None, None, None).unwrap();
    Log!(records.len(), records);
}

    c++
    
    
void main() {
    while(exchange.IO("status") == 0) {
        Sleep(1000);
    }
    exchange.SetMaxBarLen(50);
    Log(exchange.SetContractType("rb888"));

    auto r = exchange.GetRecords();
    Log(r.size(), r[0]);
}