_inp, _inpw, _inpd
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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.