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POSmallSocket causing app to crash on iPhone
 

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  1. POSmallSocket causing app to crash on iPhone
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    <p>I am trying to use the SmallSockets library to create a TCP socket connection. Currently, I'm using a button to simply test my connection to a server from my iPhone. Here is what my code looks like:</p> <pre><code>-(IBAction)btnConnect:(id)sender { bool loopConnection = true; while(loopConnection == true) { Socket *socket; int port = 11005; NSString *host = @"199.5.83.63"; socket = [Socket socket]; @try { NSMutableData *data; [socket connectToHostName:host port:port]; [socket readData:data]; // [socket writeString:@"Hello World!"]; //** Connection was successful **// [socket retain]; // Must retain if want to use out of this action block. } @catch (NSException* exception) { NSString *errMsg = [NSString stringWithFormat:@"%@",[exception reason]]; NSLog(errMsg); socket = nil; } } } </code></pre> <p>When I press the button, my app freezes. It freezes on the following function (which is part of the SmallSockets library):</p> <pre><code>- (int)readData:(NSMutableData*)data // // Append any available data from the socket to the supplied buffer. // Returns number of bytes received. (May be 0) // { ssize_t count; // data must not be null ptr if ( data == NULL ) [NSException raise:SOCKET_EX_INVALID_BUFFER format:SOCKET_EX_INVALID_BUFFER]; // Socket must be created and connected if ( socketfd == SOCKET_INVALID_DESCRIPTOR ) [NSException raise:SOCKET_EX_BAD_SOCKET_DESCRIPTOR format:SOCKET_EX_BAD_SOCKET_DESCRIPTOR]; if ( !connected ) [NSException raise:SOCKET_EX_NOT_CONNECTED format:SOCKET_EX_NOT_CONNECTED]; // Request a read of as much as we can. Should return immediately if no data. count = recv(socketfd, readBuffer, readBufferSize, 0); if ( count &gt; 0 ) { // Got some data, append it to user's buffer [data appendBytes:readBuffer length:count]; } else if ( count == 0 ) { // Other side has disconnected, so close down our socket [self close]; } else if ( count &lt; 0 ) { // recv() returned an error. if ( errno == EAGAIN ) { // No data available to read (and socket is non-blocking) count = 0; } else [NSException raise:SOCKET_EX_RECV_FAILED format:SOCKET_EX_RECV_FAILED_F, strerror(errno)]; } return count; } </code></pre> <p>The app freezes on the line: [data appendBytes:readBuffer length:count]; and then it says on the same line: Thread 1:EXC_BAD_ACCESS (code=1, address=0x5d18c48b). All I see in the output is (lldb) in green letters. As soon as a client connects, the server sends a 4 byte packet to the client.</p> <p>If anyone could shed some light as to why my app is crashing here, I'd really appreciate it. I've been banging my head for a couple hours now trying to figure out what the issue is. </p> <p>Thanks!</p>
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    1. COis there a particular reason, why you use a library, that wasnt changed in 11 years? http://sourceforge.net/projects/smallsockets/files/
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    2. CONot really. It was suggested by somebody here on StackOverflow. I'm open to other suggestions, though. I'm just really new to iOS development and a complete newbie to network programming. Could you recommend any other libraries that are as user friendly (and preferably updated and workable)? Thanks!
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    3. COI am more than happy with [AsyncSocket](https://github.com/robbiehanson/CocoaAsyncSocket)
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      1. USvikingosegundo
 

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