gpioctl.h这是什么玩艺？

[keyayi]

     

// gpioctl.h    Include file for Generic Port I/O Example Driver
//
// Define the IOCTL codes we will use.  The IOCTL code contains a command
// identifier, plus other information about the device, the type of access
// with which the file must have been opened, and the type of buffering.
//
// Robert B. Nelson (Microsoft)     March 1, 1993

// Device type           -- in the "User Defined" range."
#define GPD_TYPE 40000

// The IOCTL function codes from 0x800 to 0xFFF are for customer use.

#define IOCTL_GPD_READ_PORT_UCHAR \
    CTL_CODE( GPD_TYPE, 0x900, METHOD_BUFFERED, FILE_READ_ACCESS )

#define IOCTL_GPD_READ_PORT_USHORT \
    CTL_CODE( GPD_TYPE, 0x901, METHOD_BUFFERED, FILE_READ_ACCESS )

#define IOCTL_GPD_READ_PORT_ULONG \
    CTL_CODE( GPD_TYPE, 0x902, METHOD_BUFFERED, FILE_READ_ACCESS )

#define IOCTL_GPD_WRITE_PORT_UCHAR \
    CTL_CODE(GPD_TYPE,  0x910, METHOD_BUFFERED, FILE_WRITE_ACCESS)

#define IOCTL_GPD_WRITE_PORT_USHORT \
    CTL_CODE(GPD_TYPE,  0x911, METHOD_BUFFERED, FILE_WRITE_ACCESS)

#define IOCTL_GPD_WRITE_PORT_ULONG \
    CTL_CODE(GPD_TYPE,  0x912, METHOD_BUFFERED, FILE_WRITE_ACCESS)

union DATABUFFER{
        ULONG   LongData;
        USHORT  ShortData;
        UCHAR   CharData;
};

typedef struct  _GENPORT_WRITE_INPUT {
    ULONG   PortNumber;     // Port # to write to
    union   {               // Data to be output to port
        ULONG   LongData;
        USHORT  ShortData;
        UCHAR   CharData;
    };
}   GENPORT_WRITE_INPUT;

我看很多代码都有， 听说是驱动给提供的头文件，怎么都一样？，谁来说说这文件的来龙去脉？

 



 

[dirdirdir3]

应该就是读写IO(端口)的东西吧

[keyayi]

那怎么都一样啊，很多程序都这样的。而且头文件的名字也不变。

[dirdirdir3]

IO端口读写本来就是读和写,不同的程序只是端口号不同而已............

[dirdirdir3]

就好像不同的程序访问文件都通过CreateFile来一样,不同的是文件名和参数.......

[会思考的草]

Generic Port I/O Example Driver 所使用的IOCTL值。