_inp, _inpw, _inpd

Article
06/05/2017

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Inputs, from a port, a byte (_inp), a word (_inpw), or a double word (_inpd).

Important

These functions are obsolete. Beginning in Visual Studio 2015, they are not available in the CRT.

Important

This API cannot be used in applications that execute in the Windows Runtime. For more information, see CRT functions not supported with /ZW.

Syntax

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

Parameters

port
I/O port number.

Return Value

The functions return the byte, word, or double word read from port. There is no error return.

Remarks

The _inp, _inpw, and _inpd functions read a byte, a word, and a double word, respectively, from the specified input port. The input value can be any unsigned short integer in the range 0 – 65,535.

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.

Requirements

Routine	Required header
`_inp`	<conio.h>
`_inpw`	<conio.h>
`_inpd`	<conio.h>

For more compatibility information, see Compatibility.

Libraries

All versions of the C run-time libraries.

.NET Framework Equivalent

Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples.

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