有关IOCTL_CHANGER_MOVE_MEDIUM参数的问题

Question

Windows平台下，操作机械臂。

我用DeviceIoControl函数，选dwIoControlCode为IOCTL_CHANGER_MOVE_MEDIUM。

当中涉及到多个CHANGER_ELEMENT结构体，该结构体中又包含一个ELEMENT_TYPE结构体。
我想问下如何对这个ELEMENT_TYPE结构体初始化或者用什么方法能给这个结构体赋初始值？

Answer 1

Here is the elemenet type list:
typedef enum _ELEMENT_TYPE {
  AllElements,
  ChangerTransport,
  ChangerSlot,
  ChangerIEPort,
  ChangerDrive,
  ChangerDoor,
  ChangerKeypad
} ELEMENT_TYPE, *PELEMENT_TYPE;

How to set the element type up to the tape library setup.
For example, transport(robot) address is 0, 1, 2. You can pick up any one from 0 to 2.
  CHANGER_MOVE_MEDIUM ch_mm;

  ch_mm.Transport.ElementAddress = 0;
  ch_mm.Transport.ElementType = ChangerTransport;

The storage slot addresses are in the range of 1024h -- 3000h.
The Import/export slot addresses are from 301h -- 316h.

You want to move the cartridge from 301h to 1024h
  ch_mm.Source.ElementAddress = 0x301;
  ch_mm.Source.ElementType = ChangerIEPort;

  ch_mm.Destination.ElementAddress = 0x1024;
  ch_mm.Destination.ElementType = ChangerSlot;

So, your programer must have the library inventory data first so that you can determine the address is belonged to what element type.