MATLAB REAL-TIME WORKSHOP 7 - TARGET LANGUAGE COMPILER Manual do Utilizador descarregar pdf (Página 297)

100

101

Additional ActiveX Client Information

7-11

activex object called hPlot.) In particular, this example iterates through a

collection of

Plot interfaces, invokes the Redraw method for each interface, and

then releases each interface.

hCollection = get (hControl, 'Plots');

for i=1:get (hCollection, 'Count')

hPlot = invoke (hCollection, 'Item', i);

invoke (hPlot, 'Redraw');

release (hPlot);

end;

release (hCollection);

Converting Data

Since ActiveX defines a number of different data formats and types, you will

need to know how MATLAB converts data from

activex objects into variables

in the MATLAB workspace. Data from

activex objects must be converted:

•When a property value is retrieved

•When a value is returned from a method invocation

This chart shows how ActiveX data types are converted into variables in the

MATLAB workspace.

ActiveX Data Type MATLAB Variable

String

File Time

Error

Decimal Date

MATLAB String

Currency

Hresult

Int/Unsigned (2, 4, 8)

Bool

Scalar Double

Real (Single/Double

Null

NaN

Precision)

1 2 ... 292 293 294 295 296 297 298 299 300 301 302 ... 407 408

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