How read text file on server? - ios

Question

I use this code to read a local text file, it's work!
class StreamReader {
let encoding : UInt
let chunkSize : Int
var fileHandle : NSFileHandle!
let buffer : NSMutableData!
let delimData : NSData!
var atEof : Bool = false
init?(path: String, delimiter: String = "\n", encoding : UInt = NSUTF8StringEncoding, chunkSize : Int = 4096) {
self.chunkSize = chunkSize
self.encoding = encoding
if let fileHandle = NSFileHandle(forReadingAtPath: path),
delimData = delimiter.dataUsingEncoding(encoding),
buffer = NSMutableData(capacity: chunkSize)
{
self.fileHandle = fileHandle
self.delimData = delimData
self.buffer = buffer
} else {
self.fileHandle = nil
self.delimData = nil
self.buffer = nil
return nil
}
}
deinit {
self.close()
}
/// Return next line, or nil on EOF.
func nextLine() -> String? {
precondition(fileHandle != nil, "Attempt to read from closed file")
if atEof {
return nil
}
// Read data chunks from file until a line delimiter is found:
var range = buffer.rangeOfData(delimData, options: nil, range: NSMakeRange(0, buffer.length))
while range.location == NSNotFound {
let tmpData = fileHandle.readDataOfLength(chunkSize)
if tmpData.length == 0 {
// EOF or read error.
atEof = true
if buffer.length > 0 {
// Buffer contains last line in file (not terminated by delimiter).
let line = NSString(data: buffer, encoding: encoding)
buffer.length = 0
return line as String?
}
// No more lines.
return nil
}
buffer.appendData(tmpData)
range = buffer.rangeOfData(delimData, options: nil, range: NSMakeRange(0, buffer.length))
}
// Convert complete line (excluding the delimiter) to a string:
let line = NSString(data: buffer.subdataWithRange(NSMakeRange(0, range.location)),
encoding: encoding)
// Remove line (and the delimiter) from the buffer:
buffer.replaceBytesInRange(NSMakeRange(0, range.location + range.length), withBytes: nil, length: 0)
return line as String?
}
/// Start reading from the beginning of file.
func rewind() -> Void {
fileHandle.seekToFileOffset(0)
buffer.length = 0
atEof = false
}
/// Close the underlying file. No reading must be done after calling this method.
func close() -> Void {
fileHandle?.closeFile()
fileHandle = nil
}
}
Usage
var path_up1 = "/Users/rrr/Desktop/up/1.txt"
if let aStreamReader = StreamReader(path: path_up1) {
while let line = aStreamReader.nextLine() {
println(line)
}
}
But I have to read a file on the server (ex: http://www.1111.com/1.txt).
Help me, plz!

Answer 1

You can read the file directly via NSURLConnection
let url = NSURL(string:"http://www.1111.com/1.txt")!
let request = NSURLRequest(URL: url)
NSURLConnection.sendAsynchronousRequest(request, queue: NSOperationQueue.currentQueue()) { (response, data, error) -> Void in
if error != nil {
println(error!)
} else {
if let textFile = NSString(data: data, encoding: NSUTF8StringEncoding) {
println(textFile)
}
}
}
The example assumes that the text file is UTF-8 encoded.
Or if you want to read the data sequentially implement the delegate methods of NSURLConnection and use init?(request:delegate:startImmediately:)