Swift

Co:Z SFTP Binary File Download (from z/OS IBM Mainframe)

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Demonstrates how to download a binary file, such as a .zip, from a Co:Z SFTP server on a z/OS IBM Mainframe. Swift

func chilkatTest() {
    var success: Bool = false

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

    let sftp = CkoSFtp()!

    // Connect to the SSH server.  
    var hostname: String? = "sftp.example.com"
    var port: Int = 22
    success = sftp.connect(hostname: hostname, port: port)
    if success == false {
        print("\(sftp.lastErrorText!)")
        return
    }

    success = sftp.authenticatePw(login: "myLogin", password: "myPassword")
    if success == false {
        print("\(sftp.lastErrorText!)")
        return
    }

    success = sftp.initializeSftp()
    if success == false {
        print("\(sftp.lastErrorText!)")
        return
    }

    // To download a binary file from the Co:Z SFTP server, 
    // we must switch to binary mode in the following unconventional way.
    // We pretend to fetch a directory listing for "/+mode=binary"
    // This has the effect of putting the server in binary mode for transfers.
    var handle: String? = sftp.openDir(path: "/+mode=binary")
    if sftp.lastMethodSuccess == false {
        print("\(sftp.lastErrorText!)")
        return
    }

    // Download the "directory listing" (but it's not actually a directory listing, and we'll just discard it.)

    let dirListing = CkoSFtpDir()!
    success = sftp.readDirListing(handle: handle, dirObj: dirListing)
    if success == false {
        print("\(sftp.lastErrorText!)")
        return
    }

    // Close the directory handle:
    success = sftp.closeHandle(sftpHandle: handle)
    if success == false {
        print("\(sftp.lastErrorText!)")
        return
    }

    // Download the binary file:
    var localFilePath: String? = "c:/temp/test.zip"
    var remoteFilePath: String? = "test.zip"
    success = sftp.downloadFile(byName: remoteFilePath, localFilePath: localFilePath)
    if success == false {
        print("\(sftp.lastErrorText!)")
        return
    }

    print("Success.")

}