Question

i’m trying to send/receive data over wifi to an iphone/ipodtouch app from a C# tcpip server. for this i used cocoaAsyncSocket from the google project. If i push a button and i send a request from ipod to server it returns the requested data(song title for example)..i want to know every second what song is playng…so from C# server i send at intervals of 1 second messages to my app. In my app in an timer with the interval of 1 second i call the asyncSocket read readDataWithTimeout method. My problem is that after 8-9 seconds that method is not called anymore. The connection to the server is still active and the C# server still sends data..

what i want to do is the following thing:
-> winamp plays a song
-> C# server asks winamp what songs is he playing and sends the song title to my app.
-> iphone app receives the data and displays it

i don’t know why the readDataWithTimeout method is not called anymore after a short period of time..Maybe because the short time between messages sent by the C# server?

Thank you,
Sorin

Answer 1

i made it work..after a little more reading… so to read data when it arrives with AsyncSocket on unknown intervals i used the fallowing code(i don’t know if is the best solution but it works for what i wanted):

- (void) readDataFromSocket
{
        [socket readDataWithTimeout:-1 tag:0];
}

- (void)onSocket:(AsyncSocket *)sock didReadData:(NSData *)data withTag:(long)tag
{
    NSData *strData = [data subdataWithRange:NSMakeRange(0, [data length])];
    NSString *msg = [[[NSString alloc] initWithData:strData encoding:NSUTF8StringEncoding] autorelease];
    if(msg)
    {
        if([msg isEqualToString:@"something"])
        {
            Do stuff
        }
        else
        {
            Do something else
            }
        }
    }
    else
    {
        NSLog(@"Error converting received data into UTF-8 String");
    }
    [socket readDataWithTimeout:-1 tag:0];
}

i call once in my application the readDataFromSocket method that calls the sockets [socket readDataWithTimeout:-1 tag:0] method. It should be called only once in the app because in the method – (void)onSocket:(AsyncSocket *)sock didReadData:(NSData *)data withTag:(long)tag method in the last line i call again the [socket readDataWithTimeout:-1 tag:0]; which tells the socket to listen on the socket. When data arrives the socket will read it.

hope it helps someone..