VideoPortReadPortBufferUchar function (video.h)
The VideoPortReadPortBufferUchar function reads a number of bytes from a mapped I/O port and writes them into a buffer.
Syntax
VIDEOPORT_DEPRECATED VIDEOPORT_API VOID VideoPortReadPortBufferUchar(
PUCHAR Port,
[out] PUCHAR Buffer,
ULONG Count
);
Parameters
Port
Pointer to the I/O port. The given Port must be in a mapped I/O-space range returned by VideoPortGetDeviceBase.
[out] Buffer
Pointer to a buffer into which the UCHAR values are written.
Count
Specifies the number of bytes to be written to the buffer.
Return value
None
Remarks
The buffer must be large enough to contain at least the specified number of bytes.
A miniport driver's HwVidInterrupt or HwVidSynchronizeExecutionCallback function can call VideoPortReadPortBufferUchar.
Callers of VideoPortReadPortBufferUchar can be running at any IRQL, provided that the memory pointed to by the Buffer parameter is resident and that 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. |