PARALLEL_PNP_INFORMATION structure (parallel.h)
The PARALLEL_PNP_INFORMATION structure specifies information about the capabilities of a parallel port.
Syntax
typedef struct _PARALLEL_PNP_INFORMATION {
PHYSICAL_ADDRESS OriginalEcpController;
PUCHAR EcpController;
ULONG SpanOfEcpController;
ULONG PortNumber;
ULONG HardwareCapabilities;
PPARALLEL_SET_CHIP_MODE TrySetChipMode;
PPARALLEL_CLEAR_CHIP_MODE ClearChipMode;
ULONG FifoDepth;
ULONG FifoWidth;
PHYSICAL_ADDRESS EppControllerPhysicalAddress;
ULONG SpanOfEppController;
ULONG Ieee1284_3DeviceCount;
PPARALLEL_TRY_SELECT_ROUTINE TrySelectDevice;
PPARALLEL_DESELECT_ROUTINE DeselectDevice;
PVOID Context;
ULONG CurrentMode;
PWSTR PortName;
} PARALLEL_PNP_INFORMATION, *PPARALLEL_PNP_INFORMATION;
Members
OriginalEcpController
Specifies the base physical address that the system-supplied function driver for parallel ports uses to control the ECP operation of the parallel port.
EcpController
Pointer to the I/O port resource that is used to control the port in ECP mode.
SpanOfEcpController
Specifies the size, in bytes, of the I/O port resource.
PortNumber
Not used.
HardwareCapabilities
Specifies the hardware capabilities of the parallel port. The following capabilities can be set using a bitwise OR of the following constants:
PPT_1284_3_PRESENT
PPT_BYTE_PRESENT
PPT_ECP_PRESENT
PPT_EPP_32_PRESENT
PPT_EPP_PRESENT
PT_NO_HARDWARE_PRESENT
TrySetChipMode
Pointer to the system-supplied PPARALLEL_SET_CHIP_MODE callback that a kernel-mode driver can use to change the operating mode of the parallel port.
ClearChipMode
Pointer to the system-supplied PPARALLEL_CLEAR_CHIP_MODE callback that a kernel-mode driver can use to clear the operating mode of the parallel port.
FifoDepth
Specifies the size, in words, of the hardware first in/first out (FIFO) buffer. The FIFO word size, in bits, is the value of FifoWidth.
FifoWidth
Specifies the FIFO word size, in bits, which is the number of bits handled in parallel.
EppControllerPhysicalAddress
Not used.
SpanOfEppController
Not used.
Ieee1284_3DeviceCount
Specifies the number of daisy-chain devices currently attached to a parallel port. In Microsoft Windows XP, from zero to two devices can be simultaneously connected to a parallel port. In Windows 2000, from zero to four devices can be simultaneously connected to a parallel port.
TrySelectDevice
Pointer to the system-supplied PPARALLEL_TRY_SELECT_ROUTINE callback that a kernel-mode driver can use to attempt to select an IEEE 1284.3 device.
DeselectDevice
Pointer to the system-supplied PPARALLEL_DESELECT_ROUTINE callback that a kernel-mode driver can use to deselect an IEEE 1284.3 device.
Context
Pointer to the device extension of a parallel port's functional device object (FDO).
CurrentMode
The current operating mode of the parallel port.
PortName
The symbolic link name of the parallel port.
Remarks
For more information, see Obtaining Information About a ParallelPort.
Requirements
| Requirement | Value |
|---|---|
| Header | parallel.h (include Parallel.h) |
See also
IOCTL_INTERNAL_GET_PARALLEL_PORT_INFO
IOCTL_INTERNAL_GET_MORE_PARALLEL_PORT_INFO