FileExists Method
Checks if a file exists on the server.
Syntax
ftpclient.fileExists(remoteFile, [callback])
Callback
The 'callback' parameter specifies a function which will be called when the operation completes (or an error is encountered). If the 'callback' parameter is not specified, then the method will block and will not return until the operation completes (or an error is encountered).
The callback for this method is defined as:
function(err, data){ }
'err' is the error that occurred. If there was no error, then 'err' is 'null'.
'data' is the value returned by the method.
'err' has 2 properties which hold detailed information:
err.code err.message
Remarks
Use this method to check if RemoteFile exists in the current remote directory. This method attempts to detect file existence using SIZE and MLST commands first, and falls back to LIST command if they are not available.
Please note that this command only looks for the file in the current directory. To check for existence of a file in a different directory, change to it with ChangeDir command first, then call this method.