tailieunhanh - more iphone 3 development phần 6

Nó cũng có nghĩa là bạn cần phải có hai thiết bị được cung cấp cho phát triển, nhưng lưu ý rằng bạn không muốn kết nối cả hai thiết bị vào máy tính của bạn cùng một lúc. Điều này có thể gây ra một số vấn đề, vì không có cách nào để chỉ định mà một trong những sử dụng để gỡ lỗi. | CHAPTER 8 Peer-to-Peer Over Bluetooth Using GameKit 269 It also means that you need to have two devices provisioned for development but note that you do not want to connect both devices to your computer at the same time. This can cause some problems since there s no way to specify which one to use for debugging. Therefore you need to build and run on one device quit unplug that device and then plug in the other device and do the same thing. Once you ve done that you will have the application on both devices. You can run it on both devices or you can launch it from Xcode on one device so you can debug and read the console feedback. NOTE Detailed instructions for installing applications on a device are available at http .com iphone in the developer portal which is available only to paid iPhone SDK members. You should be aware that debugging or even running from Xcode without debugging will slow down the program running on the connected iPhone and this can have an affect on network communications. Underneath the hood all of the data transmissions back and forth between the two devices check for acknowledgments and have a timeout period. If they don t receive a response in a certain amount of time they will disconnect. So if you set a breakpoint chances are that you will break the connection between the two devices when it reaches the breakpoint. This can make figuring out problems in your GameKit application tedious. You often will need to use alternatives to breakpoints like NSLog or breakpoint actions so you don t break the network connection between the devices. We ll talk more about debugging in Chapter 15. Game On Another long chapter under your belt and you should now have a pretty firm understanding of GameKit networking. You ve seen how to use the peer picker to let your user select another iPhone or iPod touch to which to connect. You ve seen how to send data by archiving objects and you ve gotten a little taste of the complexity that is .