Question

Disclaimer: I am an Xcode / iPhone SDK Noob.

I am trying to establish a client-side TCP/IP connection to an existing server. Upon connection, I expect to receive some data about the server (version, etc.).

When my connection is made, the NSStreamEventOpenCompleted event fires, so I know the connection is made. Next the NSStreamEventHasBytesAvailable event fires and I am executing the following code. The value 71 (int) is stored in len, which I believe is correct. However, the line

[data appendBytes:&buffer length:len]; 

is crashing (I think). There is no actual error thrown but I do see __TERMINATING_DUE_TO_UNCAUGHT_EXCEPTION__ even though I have clearly added error catching:

case NSStreamEventHasBytesAvailable:     {         NSMutableData *data=[[NSMutableData alloc] init];          uint8_t *buffer[1024];         unsigned int len=0;          len=[(NSInputStream *)stream  read:buffer maxLength:1024];         if(len>0){               @try{                 [data appendBytes:&buffer length:len];             }             @catch(NSException *ex){                 NSLog(@'Fail: %@', ex);              }             [statusLabel setText:[data stringValue]];             //[bytesRead setIntValue:[bytesRead intValue]+len];         }else{             NSLog(@'No Buffer');         }         break ;     } 

Answer 1

declare your buffer as:

uint8_t buffer[1024]; 

and do the append as:

[data appendBytes:buffer length:len];