(Swift 3,4,5...) File Existence Check

Testing to see if a file exists on the FTP server. The GetSizeByName method is a convenient way to check if a file exists. It will return -1 if the file does not exist, otherwise it returns the size of the file in bytes.

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 ftp = CkoFtp2()!

    ftp.hostname = "ftp.example.com"
    ftp.username = "username"
    ftp.password = "password"

    // Connect and login to the FTP server.
    var success: Bool = ftp.connect()
    if success != true {
        print("\(ftp.lastErrorText!)")
        return
    }

    // Set the current remote directory to where the file is located:
    success = ftp.changeRemoteDir("something")
    if success != true {
        print("\(ftp.lastErrorText!)")
        return
    }

    // Test to see if the file exists by getting the file size by name. 
    // If a -1 is returned, the file does not exist.
    var fileSize: Int = ftp.getSizeByName("test123.txt").intValue
    if fileSize < 0 {
        print("file does not exist")
    }
    else {
        print("file exists and is \(fileSize) bytes in size")
    }

    success = ftp.disconnect()

}