how can I get a scanner data (stocks) from a preset one?

[salouri]

I need to select the stock dynamically from a previously set scanner on TWS. I can't find information on how to do this using this package. Is it a not implemented feature, or am I missing where to find it??
Either way, any help would be appreciated.

Thank you

[rylorin]

Hello,
May be I misunderstood but if you subscribe to getMarketScanner you will get results as MarketScannerUpdate which contains all contract (stock) information. Isn't it what you need?
Regards

[salouri]

Thanks for the response. Can you please refer me to where I can find examples on how to do this? I looked at the documentation and could find one function ib.reqScannerSubscription but still don't get exactly how to use it (e.g. what is the request id or tickerId? and where to get it from? same thing about other parameters)

[salouri]

Here is a further elaboration: the best thing I could come up with is the following:

/* eslint-disable @typescript-eslint/no-explicit-any */
// ScannerOperations.ts

import {IBApi } from '@stoqey/ib';
import { Instrument, ScannerSubscription, LocationCode, ScanCode} from '@stoqey/ib';

export class ScannerOperations {
  private ib: IBApi;

  constructor(ib: IBApi) {
    this.ib = ib;
  }

  async fetchTopStocks(
    scannerName: string,
    topStocksCount: number
  ): Promise<string[]> {
    const scannerParams: ScannerSubscription = {
      instrument: Instrument.STK,
      locationCode: LocationCode.STK_US_MAJOR,
      scanCode: ScanCode.ALL_SYMBOLS_ASC,
      numberOfRows: topStocksCount,
    };
    const scannerData = this.ib.reqScannerSubscription(0, scannerParams);
    return this.extractTopStocks(scannerData, topStocksCount);
  }

  private extractTopStocks(scannerData: any, topStocksCount: number): string[] {
    const sortedStocks = scannerData.sort(
      (a: any, b: any) => b.someMetric - a.someMetric
    );
    return sortedStocks.slice(0, topStocksCount).map((stock: any) => stock.symbol);
  }
}

But the ib.reqScannerSubscription function only reads from TWS predefined scanners. I have created a CUSOM scanner called LowFloatStocks but I don't know where to use it in above code (if everything else is correct)