输入流读取时缺少字符串数据

Question

我尝试使用inputStream.read方法接收数据消息缺少某些字符。我的消息太长了。例如，如果我的消息是30000字符，则输出字符串是2000个字符。缺少1000个字符。

var buffer = [UInt8](repeating:0, count:bufferSize)
    var output:String = ""
    while(inputStream!.hasBytesAvailable){
        let bytesRead:Int = inputStream!.read(&buffer, maxLength: buffer.count)
        if bytesRead > 0 {
            var outputString:String=(NSString(bytes:buffer, length:bytesRead, encoding:String.Encoding.utf8.rawValue) as? String)!
            if(output != "" ){
                if(output.hasPrefix("ping")){  }else{
                    output = output + outputString
                }
            }else{
                    output=outputString
            }
        }else{
            print("# Error Reading")
            connect()
            login()
        }
        usleep(100000)
    }