_inp, _inpw, _inpd
Inputs a byte (_inp), a word (_inpw), or a double word (_inpd) from a port.
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. For information about using I/O ports in these operating systems, use the Win32 Communications API.
Requirements
Routine |
Required header |
|---|---|
_inp |
<conio.h> |
_inpw |
<conio.h> |
_inpd |
<conio.h> |
For more compatibility information, see Compatibility in the Introduction.
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.