MATLAB IMAGE ACQUISITION TOOLBOX - RELEASE NOTES Guide de l'utilisateur télécharger pdf (Page 62)

3 Providing Hardware Information

3-18

The demo adaptor provides an example, defining a class to hold additional format

information. This class, named DemoDeviceFormat, stores format information

such as width, height, and color space. The following example, taken from the demo

adaptor, shows how to instantiate an object of this derived class, assign values to

the data members of the class, and then store the object in the adaptor data of the

IDeviceFormat object.

DemoDeviceFormat* rgbFormatInfo = new DemoDeviceFormat();

rgbFormatInfo->setFormatWidth(demo::RGB_FORMAT_WIDTH);

rgbFormatInfo->setFormatHeight(demo::RGB_FORMAT_HEIGHT);

rgbFormatInfo->setFormatNumBands(demo::RGB_FORMAT_BANDS);

rgbFormatInfo->setFormatColorSpace(imaqkit::colorspaces::RGB);

deviceFormat->setAdaptorData(rgbFormatInfo);

Accessing Adaptor Data

To access the adaptor data stored in an IDeviceInfo or IDeviceFormat object, use the

getAdaptorData() member function of the object.

The following example, taken from the demo adaptor, shows how to retrieve the

adaptor data from the IDeviceFormat object. In the example, selectedFormat is a

DemoDeviceFormat object. Note that because the getAdaptorData() member function

returns a handle to the IMAQInterface class, you must cast the returned object to your

defined class.

dynamic_cast<DemoDeviceFormat*>(selectedFormat->getAdaptorData());

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MATLAB IMAGE ACQUISITION TOOLBOX - RELEASE NOTES Guide de l'utilisateur Page 62