在iOS中通过GCDAsyncsocket读取xml文件

Question

I am stuck on a very basic concept here. I have been using GCDAsyncsocket for my project. It's request response kind of a client wherein i get a xml file from a server(Java based) over socket, i read this file save it in App's document directory, parse the request tags send to someone else, get the response to corresponding request and write it to a xml file appending responses after each respective request and sending it back to the server.

I tried reading the file but i am getting the data in bytes i suppose, i am unable to decode that data to appropriate format Can someone help me on how i can read a xml file over socket(GCDAsyncsocket) and save it to my app documents directory

Here is the basic code that i have been using:- - (IBAction)connect:(id)sender {

NSString *hostAddress = self.serverTextfield.text;
uint16_t port = PORT;

_delegateQueue = dispatch_queue_create("com.a.cs.delegateQueue", NULL);
asyncSocket = [[GCDAsyncSocket alloc] initWithDelegate:self delegateQueue:_delegateQueue];

DDLogInfo(@"Connecting to %@ on port %hu...", hostAddress, port);

NSError *error = nil;
if (![asyncSocket connectToHost:hostAddress onPort:port error:&error])
{
    DDLogError(@"Oops Error Connecting.. %@",error);
    self.notificationTextView.text = @"Oops Error Connecting";
} else {
    DDLogVerbose(@"Connected");
    self.notificationTextView.text = @"Connected";
}
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
NSString *uniqueID = [defaults objectForKey:@"UUID"];

NSLog(@"%@",uniqueID);

 NSUInteger len = [uniqueID lengthOfBytesUsingEncoding:NSUTF8StringEncoding];
 Byte buffer[2];
 buffer[0] = (0xff & (len >>8));
 buffer[1] = (0xff & (len));

 NSMutableData *outData = [NSMutableData dataWithCapacity:2];
 [outData appendBytes:buffer length:2];
 [outData appendData:[uniqueID dataUsingEncoding:NSUTF8StringEncoding]];

NSLog(@"%@",outData);
[asyncSocket writeData:outData  withTimeout:-1 tag:0];
[asyncSocket readDataWithTimeout:-1 tag:0];

}

This is my action method which gets invoked on a button click named "Connect". I write out some data send it to server and start reading data and in the delegate didReadData i do the manipulation of the data i received from the server and again call
[sock readDataWithTimeout:-1 tag:0]; so that it continuously listens for the read data...

Now instead of the string data that i am getting from the server i am expecting a XML file which my server would be sending me.. How do i read this file and manipulate it?? Also how can i send a file to the server back which i saved in my Application's Document directory.. Any help would be appreciated..

Answer 1

The first thing I would look at, if you haven't already, is the SimpleHTTPClient project that GCDAsyncSocket included in the download. The XML doctype is the payload inside the HTTP packets, so it's an appropriate project to model yours after.

That said, are you sure your code is sending to your server what the server is expecting? It is expecting nothing more than a UTF8 string UUID? It isn't expecting that UUID to be wrapped in XML? Does the server log incoming connection requests in a way you can see that it is getting what it expects and is actually returning to you XML?