Read the REST Response Body into BinData

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Demonstrates Rest.ReadRespBd, which reads the response body as raw bytes into a BinData, replacing its previous contents.

The file paths are relative to the application's current working directory. Absolute paths may also be used. Supply the paths appropriate to your own environment.

func chilkatTest() {
    var success: Bool = false

    let rest = CkoRest()!
    var bTls: Bool = true
    var bAutoReconnect: Bool = true
    success = rest.connect(hostname: "example.com", port: 443, tls: bTls, autoReconnect: bAutoReconnect)
    if success == false {
        print("\(rest.lastErrorText!)")
        return
    }

    //  The file paths are relative to the application's current working directory.  Absolute paths
    //  may also be used.  Supply the paths appropriate to your own environment.

    success = rest.sendReqNoBody(httpVerb: "GET", uriPath: "/api/images/1")
    if success == false {
        print("\(rest.lastErrorText!)")
        return
    }

    var statusCode: Int = rest.readResponseHeader().intValue
    if statusCode < 0 {
        print("\(rest.lastErrorText!)")
        return
    }

    //  Check for the expected success status code.  If the response is not 200, the body is likely
    //  error text formatted as JSON, XML, or HTML rather than the expected binary content.  In that case
    //  read the body as text, report it, and return.
    if statusCode != 200 {
        let sbError = CkoStringBuilder()!
        success = rest.readRespSb(responseBody: sbError)
        if success == false {
            print("\(rest.lastErrorText!)")
            return
        }

        print("Request failed with status code \(statusCode)")
        print("\(sbError.getAsString()!)")
        return
    }

    //  The status code is 200.  Read the response body as raw bytes into a BinData.
    let bdResponse = CkoBinData()!
    success = rest.readRespBd(responseBody: bdResponse)
    if success == false {
        print("\(rest.lastErrorText!)")
        return
    }

    var bSaved: Bool = bdResponse.writeFile(path: "qa_output/image.png")
    if bSaved != true {
        print("Failed to save the response body.")
        return
    }

    print("Received \(bdResponse.numBytes.intValue) bytes.")

}