CODEWITHSUNDEEP
iosxcodemidicoremidi
Youngin
Youngin

Reputation: 261

MIDINetworkConnection causing crashing errors

I am experiencing frequent crashing that I believe is related to this method of checking the number of MIDINetwork Sessions. 

- (NSString*) describeConnections {
    NSMutableArray* connections = [NSMutableArray arrayWithCapacity:1000];
    for (MIDINetworkConnection* connection in [[MIDINetworkSession defaultSession] connections]) {
        [connections addObject:[[connection host] name]];
    }

    if ([connections count] > 0) {
        return [connections componentsJoinedByString:@", "];
    }
    else
        return @"(Not connected)";
}

When the app crashes it stops on the line 

for (MIDINetworkConnection* connection in [[MIDINetworkSession defaultSession] connections])

The error I am getting is 

Thread 1: EXC_BAD_ACCESS(code=EXC_1386_GPFLT)

In the debugger it shows

_impl   _MIDINetworkConnectionImpl *    NULL

I have tried to prevent the crashing by checking if MIDINetworkSession is NULL before looping through the connections but that hasn't worked. Occasionally when xcode crashes it will stop at 

int main(int argc, char *argv[])
{
    @autoreleasepool {
        int retVal = UIApplicationMain(argc, argv, nil, nil);
        return retVal;
    }
}

Can anyone offer a guess as to what's happening?

Upvotes: 0

Views: 172

Answers (1)

Feng Lin
Feng Lin

Reputation: 593

It seems that connections contain NULL, in some case the system dealloc the connections.But in the set, it cannot use the NULL to be elements, so you should check the connections or use the try catch to get the exception.

Upvotes: 1

Related Questions