IStiUSD::RawReadCommand method (stiusd.h)
A still image minidriver's IStiUSD::RawReadCommand method reads command information from a still image device.
Syntax
HRESULT RawReadCommand(
LPVOID lpBuffer,
LPDWORD lpdwNumberOfBytes,
LPOVERLAPPED lpOverlapped
);
Parameters
lpBuffer
Caller-supplied pointer to a buffer to receive data read from the device.
lpdwNumberOfBytes
Caller-supplied pointer to a DWORD. The caller loads the DWORD with the number of bytes in the buffer pointed to by lpBuffer. The driver must replace this value with the number of bytes actually read.
lpOverlapped
Optional, caller-supplied pointer to an OVERLAPPED structure (described in the Microsoft Windows SDK documentation).
Return value
If the operation succeeds, the method should return S_OK. Otherwise, it should return one of the STIERR-prefixed error codes defined in stierr.h.
Remarks
It is only necessary to implement IStiUSD::RawReadCommand if command and data information are read from a device by different methods. For other devices, IStiUSD::RawReadData can be used for both commands and data. If the call is not implemented, it must return STIERR_UNSUPPORTED.
Implementation of this method, along with the meaning of buffer contents, are vendor-defined.
Requirements
| Requirement | Value |
|---|---|
| Target Platform | Desktop |
| Header | stiusd.h (include Stiusd.h) |