_inp、_inpw、_inpd_inp, _inpw, _inpd

从某个端口输入一个字节 (_inp)、一个字 (_inpw) 或一个双字 (_inpd)。Inputs, from a port, a byte (_inp), a word (_inpw), or a double word (_inpd).

重要

这些函数已过时。These functions are obsolete. 从 Visual Studio 2015 开始,CRT 中不再提供这些函数。Beginning in Visual Studio 2015, they are not available in the CRT.

重要

此 API 不能用于在 Windows 运行时中执行的应用程序。This API cannot be used in applications that execute in the Windows Runtime. 有关详细信息,请参阅 /ZW 不支持的 CRT 函数For more information, see CRT functions not supported with /ZW.

语法Syntax

int _inp(   
   unsigned short port   
);  
unsigned short _inpw(   
   unsigned short port   
);  
unsigned long _inpd(   
   unsigned short port   
);  

参数Parameters

port
I/O 端口号。I/O port number.

返回值Return Value

这些函数返回从 port中读取的字节、字或双字。The functions return the byte, word, or double word read from port. 无错误返回。There is no error return.

备注Remarks

_inp_inpw_inpd 函数分别从指定的输入端口读取一个字节、一个字和一个双字。The _inp, _inpw, and _inpd functions read a byte, a word, and a double word, respectively, from the specified input port. 输入值可以是 0 - 65,535 范围内的任何无符号短整数。The input value can be any unsigned short integer in the range 0 - 65,535.

由于这些函数直接从 I/O 端口读取内容,因此它们可能无法在 Windows NT、Windows 2000、Windows XP 和 Windows Server 2003 的用户代码中使用。Because these functions read directly from an I/O port, they might not be used in user code in Windows NT, Windows 2000, Windows XP, and Windows Server 2003.

惠?Requirements

例程所返回的值Routine 必需的标头Required header
_inp <conio.h><conio.h>
_inpw <conio.h><conio.h>
_inpd <conio.h><conio.h>

有关更多兼容性信息,请参阅 兼容性For more compatibility information, see Compatibility.

Libraries

C 运行时库的所有版本。All versions of the C run-time libraries.

请参阅See Also

控制台和端口 I/O Console and Port I/O
_outp、_outpw、_outpd_outp, _outpw, _outpd