(C++) WebSocket Binance Trade Stream (subscribe and receive updates)

Subscribe to a binance trade stream and receive updates.

For more information, see https://binance-docs.github.io/apidocs/spot/en/#live-subscribing-unsubscribing-to-streams

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#include <CkWebSocket.h>
#include <CkRest.h>
#include <CkJsonObject.h>

void ChilkatSample(void)
    {
    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    CkWebSocket ws;

    // For brevity, this example does not check for errors when etablishing the WebSocket connection.
    // See Establish WebSocket Connection for more complete sample code for making the connection.

    CkRest rest;

    // Connect to wss://stream.binance.com:9443
    bool success = rest.Connect("stream.binance.com",9443,true,false);
    if (success == false) {
        std::cout << rest.lastErrorText() << "\r\n";
        return;
    }

    success = ws.UseConnection(rest);
    if (success == false) {
        std::cout << ws.lastErrorText() << "\r\n";
        return;
    }

    ws.AddClientHeaders();

    //  Raw streams are accessed at /ws/<streamName>
    const char *responseBody = rest.fullRequestNoBody("GET","/ws/btcusdt");
    if (rest.get_LastMethodSuccess() == false) {
        std::cout << rest.lastErrorText() << "\r\n";
        return;
    }

    success = ws.ValidateServerHandshake();
    if (success != true) {
        std::cout << ws.lastErrorText() << "\r\n";
        std::cout << responseBody << "\r\n";
        std::cout << rest.responseHeader() << "\r\n";
        return;
    }

    std::cout << responseBody << "\r\n";
    std::cout << rest.responseHeader() << "\r\n";

    // POST JSON to subscribe to a stream

    // {
    // "method": "SUBSCRIBE",
    // "params":
    // [
    // "btcusdt@aggTrade",
    // "btcusdt@depth"
    // ],
    // "id": 1
    // }

    CkJsonObject json;
    json.UpdateString("method","SUBSCRIBE");
    json.UpdateString("params[0]","btcusdt@aggTrade");
    json.UpdateString("params[1]","btcusdt@depth");
    json.UpdateInt("id",1);

    // Send a full message in a single frame
    bool finalFrame = true;
    success = ws.SendFrame(json.emit(),finalFrame);
    if (success != true) {
        std::cout << ws.lastErrorText() << "\r\n";
        return;
    }

    CkJsonObject jsonTradeData;
    jsonTradeData.put_EmitCompact(false);

    // Begin reading the trade stream response.
    // We'll just read the 1st 10 updates and then exit..
    bool receivedFinalFrame = false;
    int numTradesReceived = 0;
    while (numTradesReceived < 5) {

        success = ws.ReadFrame();
        if (success != true) {
            std::cout << "Failed to receive a frame" << "\r\n";
            std::cout << "ReadFrame fail reason = " << ws.get_ReadFrameFailReason() << "\r\n";
            std::cout << ws.lastErrorText() << "\r\n";
            return;
        }

        // The responses we desire are in Text frames, where the opcode = 1.
        if (ws.get_FrameOpcodeInt() == 1) {
            const char *receivedJson = ws.getFrameData();

            jsonTradeData.Load(receivedJson);
            std::cout << jsonTradeData.emit() << "\r\n";

            numTradesReceived = numTradesReceived + 1;
        }

    }

    // Close the websocket connection.
    success = ws.SendClose(true,1000,"Closing this websocket.");
    if (success != true) {
        std::cout << ws.lastErrorText() << "\r\n";
        return;
    }

    // Read the Close response.
    success = ws.ReadFrame();
    if (success != true) {
        std::cout << "ReadFrame fail reason = " << ws.get_ReadFrameFailReason() << "\r\n";
        std::cout << ws.lastErrorText() << "\r\n";
        return;
    }

    std::cout << "Success." << "\r\n";

    // The output of the above code is shown here:
    }