(Swift 2) Wait for Async Method to Complete

Demonstrates using the Wait method to wait for an asynchronous method to complete. This example will do an SFTP upload (over SSH) and will use the Async version of each method. Obviously, waiting for the async method to complete is the same as making a synchronous call, but an application wouldn't typically do this. An application might, for example, do other things as a background task is running, and then later wait for the task to complete.

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

func chilkatTest() {
    // All Chilkat classes can be unlocked at once at the beginning of a program
    // by calling UnlockBundle.  It requires a Bundle unlock code.
    let chilkatGlob = CkoGlobal()
    var success: Bool = chilkatGlob.UnlockBundle("Anything for 30-day trial.")
    if success != true {
        print("\(chilkatGlob.LastErrorText)")
        return
    }

    let sftp = CkoSFtp()

    // Set some timeouts, in milliseconds:
    sftp.ConnectTimeoutMs = 15000
    sftp.IdleTimeoutMs = 15000
    var waitMaxMs: Int = 30000

    // Connect to the SSH server.  
    // The standard SSH port = 22
    // The hostname may be a hostname or IP address.
    var port: Int = 22
    var hostname: String? = "www.my-ssh-server.com"

    var task: CkoTask? = sftp.ConnectAsync(hostname, port: port)
    if sftp.LastMethodSuccess == false {
        print("\(sftp.LastErrorText)")
        return
    }

    // Start the background task.
    success = task!.Run()
    if !success {
        print("\(task!.LastErrorText)")
    }

    // Wait for the connect task to finish.
    // The true/false returned by Wait applies to the Wait method call, not the task.
    success = task!.Wait(waitMaxMs)
    if !success || (task!.StatusInt.intValue != 7) || (task!.TaskSuccess != true) {
        if !success {
            // The task.LastErrorText applies to the Wait method call.
            print("\(task!.LastErrorText)")
        }
        else {
            // The ResultErrorText applies to the underlying task method call (i.e. the Connect)
            print("\(task!.Status)")
            print("\(task!.ResultErrorText)")
        }

        task = nil
        return
    }

    task = nil

    // Authenticate with the SSH server.  Chilkat SFTP supports
    // both password-based authenication as well as public-key
    // authentication.  This example uses password authenication.
    task = sftp.AuthenticatePwAsync("myLogin", password: "myPassword")
    // To keep the example short, we'll skip handling failures.
    // The failures would be handled in the same way as shown above.

    success = task!.Run()
    success = task!.Wait(waitMaxMs)
    task = nil

    // After authenticating, the SFTP subsystem must be initialized:
    task = sftp.InitializeSftpAsync()
    success = task!.Run()
    success = task!.Wait(waitMaxMs)
    task = nil

    // Upload from the local file to the SSH server.
    // Important -- the remote filepath is the 1st argument,
    // the local filepath is the 2nd argument;
    var remoteFilePath: String? = "hamlet.xml"
    var localFilePath: String? = "c:/temp/hamlet.xml"

    task = sftp.UploadFileByNameAsync(remoteFilePath, localFilePath: localFilePath)
    if sftp.LastMethodSuccess == false {
        print("\(sftp.LastErrorText)")
        return
    }

    success = task!.Run()
    success = task!.Wait(waitMaxMs)
    if !success || (task!.StatusInt.intValue != 7) || (task!.TaskSuccess != true) {
        if !success {
            // The task.LastErrorText applies to the Wait method call.
            print("\(task!.LastErrorText)")
        }
        else {
            // The ResultErrorText applies to the underlying task method call (i.e. the Connect)
            print("\(task!.Status)")
            print("\(task!.ResultErrorText)")
        }

        task = nil
        return
    }

    task = nil
    print("File uploaded.")

}