ReadRegister

Description

Reads a quadlet from the selected 1394 register of the current camera.


Syntax

[VB]
Value=objActiveDcam.ReadRegister( Reg )

[C/C++]
HRESULT ReadRegister( long Reg, long* pValue );


Data Types [VB]

Reg: Long
Return value: Long


Parameters [C/C++]

Reg [in]

The 32-bit offset of the register into the 1394 base address FFFF 0000 0000 h or the offset of the register into the Camera Control and Status Register FFFF F0F0 0000 h.

pValue [out,retval]

Pointer to the registers's 32-bit value

Return Values

S_OK

Success

E_FAIL

Failure.

Examples

This C++ example reads the value of the temperature inquiry register using the absolute register offset:

value=ActiveDcam.ReadRegister(0xF0F0052C);

This VB example reads the value of the temperature inquiry register using the relative register offset:

value=ActiveDcam.ReadRegister(&H52C)

Remarks

Addresses starting with F (least four significant bits are on) will be treated as 32-bit offsets to the 1394 base adress FFFF 0000 0000 h. Other addresses will be treated as offsets into the Camera Control and Status register, which usually starts with FFFF F0F0 0000 h.

For more information on the DCAM command registers refer to "IIDC 1394-based Digital Camera Specification, Version 1.31" published by the 1394 Trade Association.