VideoPortReadPortUchar function (video.h)
The VideoPortReadPortUchar function reads a byte from a mapped I/O port.
Syntax
VIDEOPORT_DEPRECATED VIDEOPORT_API UCHAR VideoPortReadPortUchar(
PUCHAR Port
);
Parameters
Port
Pointer to the port. The given Port must be in a mapped I/O-space range returned by VideoPortGetDeviceBase.
Return value
VideoPortReadPortUchar returns the byte read from the adapter.
Remarks
A miniport driver's HwVidInterrupt or HwVidSynchronizeExecutionCallback function can call VideoPortReadPortUchar.
Callers of VideoPortReadPortUchar can be running at any IRQL, provided that the memory pointed to by the Port parameter is resident, mapped device memory.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Available in Windows 2000 and later versions of the Windows operating systems. |
| Target Platform | Desktop |
| Header | video.h (include Video.h) |
| Library | Videoprt.lib |
| DLL | Videoprt.sys |
| IRQL | See Remarks section. |