MATLAB IMAGE ACQUISITION TOOLBOX - RELEASE NOTES Uživatelská příručka stáhnout pdf (Strana 127)

Implementing Get and Set Support for Device-Specific Properties

6-15

Defining a Set Listener Class

Create a set listener class, deriving it from the abstract class IPropPostSetListener,

as shown in the following example. (The name of the class includes the word Post

because the toolbox notifies listeners after it updates the property value stored in the

container.)

In this example, the constructor accepts a handle to an IAdaptor object. Because the

toolbox establishes listeners on a per-instance basis, passing this handle can be helpful,

but it is not a requirement.

The IPropPostSetListener class defines one virtual function: the notify() member

function. In this function, you define how your adaptor responds when a user changes the

value of a property. For more information, see “Creating the notify() Function for Your

Class” on page 6-16.

#include "mwadaptorimaq.h"

#include "MyDeviceImaq.h" // For this example

class MyDevicePropSetListener : public IPropPostSetListener

{

public:

// Constructor/Destructor

MyDevicePropSetListener(MyDeviceAdaptor* parent):

_parent(parent) {}

virtual ~MyDevicePropSetListener() {};

virtual void notify(imaqkit::IEnginePropInfo* propertyInfo,

void* newValue);

private:

// Declare handle to parent as member data

MyDeviceAdaptor* _parent;

// Property Information object.

imaqkit::IPropInfo* _propInfo;

// The new value for integer properties.

int _lastIntValue;

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MATLAB IMAGE ACQUISITION TOOLBOX - RELEASE NOTES Uživatelská příručka Strana 127