application如何与driver进行交互？

在windows和liunx下面的driver都是把device当做file来操作，在application里面直接调用open，write等函数就可以直接和driver交互数据，可是在Mac OS X是如何实现的呢？我在Mac OS X下面用I/O Kit开发了一个简单的PCI driver，我想请教一下，那么如何来安装我的driver，同时如何来和application交互数据呢？

大概得实现一个user client吧

yes.paranoid may be right .I use user clint to talk to my usb device.

macWin，你能不能把你的实现原理，给我讲讲，如果能把你的代码email给我，那就太好了。3x

你可以先参照苹果网站上的例子simpleuserclient,simpledataqueue

paranoid is right!
参照苹果网站上的例子simpleuserclient

paranoid,这两个例子实在是太好了。可是我有个问题：既然user client也是运行在kernel上，那么如何安装user client呢？是不是安装driver的时候也就已经安装上了user client呢？或者说user client就是driver的一部分？

You are right ! The user client is a part of driver . It will be loaded when driver loaded .

多谢macwin回答。
我还想问问你，你是否用过POSIX里的device file来实现过和driver交互过数据吗？就象在liunx下的driver一样？我觉得用user client来实现有点复杂，是不是？

You may be right . I am always looking for a simple way to
commute data between AP and Driver .And I known little about device file  .

苹果网站上有两个pdf是关于app和driver之间的通信的
AccessingHardware,WritingDeviceDriver
按照她的文档来讲，当前只有storage,serial,network devices可以通过使用device file这种形式的接口来通信。
而pci，文当中说There are no device interface for PIC and AGP devices.看来只能自力更生了。

多谢二位的回答，决定放分了！ :D :D :D

To paranoid : I am writting a utility to send vendor command (like scsi cmd format) to the U Disk on Mac OS X.
I use use client. But It runs not stable enough . I want to find a way like device file to send scsi command to the U disk . Do u have some idear about that ? Thanks .

简单的情形下可以使用setProperties，这样接口比较简单，不易出错。方法为在user client端实现setProperties函数,app中调用IOConnectSetCFProperties传递你的消息

To paranoid : I am writting a utility to send vendor command (like scsi cmd format) to the U Disk on Mac OS X.
I use use client. But It runs not stable enough . I want to find a way like device file to send scsi command to the U disk . Do u have some idear about that ? Thanks .