MATLAB IMAGE ACQUISITION TOOLBOX - RELEASE NOTES Guide de l'utilisateur télécharger pdf (Page 52)

3 Providing Hardware Information

3-8

Specifying Device and Format Information

Every adaptor must include a getAvailHW() function. In this function, you provide

the toolbox with information about the device (or devices) that are currently connected

to the user's system. An adaptor can represent one particular device, multiple devices

supported by a particular vendor, or a class of devices. For example, the toolbox includes

an adaptor for Matrox devices that supports many different framegrabbers provided by

that vendor.

When a user calls the imaqhwinfo function to find out which devices are available on

their system, the toolbox engine calls your adaptor's getAvailHW() function to get this

information. When you implement this function, you determine the names, device IDs,

and format names that the toolbox displays to users.

This section includes the following topics

• “Using Objects to Store Device and Format Information” on page 3-8

• “Suggested Algorithm” on page 3-9

• “Storing Device Information” on page 3-11

• “Storing Format Information” on page 3-12

• “Storing Adaptor Data” on page 3-17

Using Objects to Store Device and Format Information

The adaptor kit provides three classes to store device and format information:

Adaptor Kit Object Purpose

IHardwareInfo Overall container class for hardware information

IDeviceInfo Container for information about a particular device

IDeviceFormat Container for information about the formats supported by

a particular device

When the toolbox engine calls your adaptor's getAvailHW() function, it passes your

adaptor a handle to an IHardwareInfo object.

For each device you want to make available through your adaptor, you must create an

IDeviceInfo object and then store the object in the IHardwareInfo object. For each

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MATLAB IMAGE ACQUISITION TOOLBOX - RELEASE NOTES Guide de l'utilisateur Page 52