_outp、_outpw、_outpd_outp, _outpw, _outpd

按端口、字节 (_outp)、字 (_outpw) 或双字 (_outpd) 输出。Outputs, at a port, a byte (_outp), a word (_outpw), or a double word (_outpd).

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 _outp(  
unsigned short port,  
int databyte   
);  
unsigned short _outpw(  
unsigned short port,  
unsigned short dataword   
);  
unsigned long _outpd(  
unsigned short port,  
unsigned long dataword   
);  

参数Parameters

portport
端口号。Port number.

databyte、dataworddatabyte, dataword
输出值。Output values.

返回值Return Value

这些函数返回数据输出。The functions return the data output. 无错误返回。There is no error return.

备注Remarks

_outp_outpw_outpd 函数分别将字节、字和双字写入指定的输出端口。The _outp, _outpw, and _outpd functions write a byte, a word, and a double word, respectively, to the specified output port. port 参数可为 0 - 65,535 范围内的任何无符号整数。databyte 可为 0 - 255 范围内的任何整数;dataword 可分别为整数、无符号短整数和无符号长整数范围内的任何值。The port argument can be any unsigned integer in the range 0 - 65,535; databyte can be any integer in the range 0 - 255; and dataword can be any value in the range of an integer, an unsigned short integer, and an unsigned long integer, respectively.

由于这些函数可直接写入到 I/O 端口,因此它们无法用于 Windows NT、Windows 2000、Windows XP 和 Windows Server 2003 中的用户代码。Because these functions write directly to an I/O port, they cannot be used in user code in Windows NT, Windows 2000, Windows XP, and Windows Server 2003. 有关在这些操作系统中使用 I/O 端口的信息,请在 MSDN 上搜索“Win32 中的串行通信”。For information about using I/O ports in these operating systems, search for "Serial Communications in Win32" at MSDN.

要求Requirements

例程Routine 必需的标头Required header
_outp <conio.h><conio.h>
_outpw <conio.h><conio.h>
_outpd <conio.h><conio.h>

有关兼容性的详细信息,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.

另请参阅See Also

控制台和端口 I/O Console and Port I/O
_inp、_inpw、_inpd_inp, _inpw, _inpd