IOS開發-NSString 導致程序exec_bad_access可能的原因

我的問題是給sceneid分配了一個autorelease object,其是隻要加上retain那句話就不會被NSAutoreleasePool釋放了，debug時sceneid也會顯示summary unavailable，OK了。

具體可以參考stackoverflow的原帖NSString makes my app crash… maybe，話說我是準備提問時，在建議的相似的問題裏找到的，很好用的功能，呵呵。

- (void)onSocket:(AsyncSocket *)sock didReadData:(NSData *)data withTag:(long)tag {
	
    
    NSString *aStr = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];  
    NSLog(@"Hava received datas is :%@",[aStr substringToIndex:1]);  
    NSString *fisrtChar=[aStr substringToIndex:1];
    if([fisrtChar isEqualToString:@"1"])
    {
        NSLog(@"Get Scene id %@",[aStr substringFromIndex:2]);
        //獲取
        SceneId= [[NSString alloc] init];
        SceneId=[aStr substringFromIndex:2];
        //移除最後的終止符
        SceneId=[SceneId substringToIndex:[SceneId length]-1];
        [SceneId retain];
        NSString *cmds=[NSString stringWithFormat:@"2 %@*CAMERA1*DATA GET",SceneId];
        NSLog(@"cmd we use is %@",cmds);
        [self SendCommand:cmds ReturnValueType:1];
    }
    else if([fisrtChar isEqualToString:@"2"])
    {
        NSString *cmds=[NSString stringWithFormat:@"2 %@*CAMERA1*DATA GET",SceneId];
        NSLog(@"cmd we use is %@",cmds);
        
        NSLog(@"Get camera data %@",[aStr substringFromIndex:2]);
        NSString *temp=[aStr substringFromIndex:2];
        temp=[temp substringToIndex:[temp length]-1];
      
       [cameraData removeAllObjects];
        cameraData=[[NSMutableArray alloc] init];
        //cameraData= [NSMutableArray arrayWithObjects: @"one", @"two", @"three", @"four", nil];
        
        [cameraData addObjectsFromArray:[temp componentsSeparatedByString:@" "]];
       // NSLog(@"array length %@",cameraData);
        for(int i= 0; i< [cameraData count]; i++){
           NSLog(@"aaa %@" ,[cameraData objectAtIndex:i]);
        }
        //[temp release];
        
    }
    self.tb_result.text = aStr;  
    [aStr release];  
    [client readDataWithTimeout:-1 tag:0];  
   

}