(Swift 3,4,5...) HTTP POST and Stream Response to File

Demonstrates how to send an HTTP POST and stream the response body directly to a file.

Chilkat Downloads for the Swift Programming Language MAC OS X (Cocoa) Objective-C/Swift Libs iOS Objective-C/Swift Libs

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

    let rest = CkoRest()!

    let url = CkoUrl()!
    // This URL will emit a response that echos the query params (name and age)
    url.parseUrl("https://www.chilkatsoft.com/readPost.asp")

    // Connect to the web server
    var bAutoReconnect: Bool = true
    var success: Bool = rest.connect(url.host, port: url.port.intValue, tls: url.ssl, autoReconnect: bAutoReconnect)
    if success != true {
        print("\(rest.lastErrorText!)")
        return
    }

    rest.addQueryParam("name", value: "John")
    rest.addQueryParam("age", value: "33")

    //  Send the HTTP POST.
    success = rest.sendReqFormUrlEncoded("POST", uriPath: url.path)
    if success != true {
        print("\(rest.lastErrorText!)")
        return
    }

    // Read the response header.
    var responseStatusCode: Int = rest.readResponseHeader().intValue
    if responseStatusCode < 0 {
        print("\(rest.lastErrorText!)")
        return
    }

    print("Response status code = \(responseStatusCode)")

    // We expect a 200 response status if the file data is coming.
    // Otherwise, we'll get a string response body with an error message(or no response body).
    if responseStatusCode == 200 {

        let bodyStream = CkoStream()!

        // The stream's sink will be a file.
        bodyStream.sinkFile = "qa_output/out.txt"

        // Read the response body to the stream.  Given that we've
        // set the stream's sink to a file, it will stream directly
        // to the file.
        success = rest.readRespBodyStream(bodyStream, autoSetStreamCharset: true)
        if success != true {
            print("\(rest.lastErrorText!)")
            return
        }

        print("Successfully streamed the response to a file.")

    }
    else {
        var errResponse: String? = rest.readRespBodyString()
        if rest.lastMethodSuccess != true {
            print("\(rest.lastErrorText!)")
        }
        else {
            print("\(errResponse!)")
        }

    }


}