Classes..

Former Member — Tue, 11 Mar 2008 04:48:48 GMT

How to find the Importing and exporting Parameters For a

Events, methods etc of a class in OOPS??

Thx,

Shashi.

Re: Classes..

Former Member — Tue, 11 Mar 2008 05:00:04 GMT

Hi Shashi,

Simple way is press where-used-list for that class ....

Re: Classes..

Former Member — Tue, 11 Mar 2008 05:07:17 GMT

Go to se24 , select the method / event & click on parameters button..

You can find the colomn 'TYPE' in which importing or exporting is written..

Re: Classes..

Former Member — Tue, 11 Mar 2008 05:13:01 GMT

Hi,

this u can do either from the se24 by using the class name.

or from the abap editor press the pattern button(CTRL+F6) in the application tool bar.there select the radio button call method and give all the requirements and then press enter.

rgds,

bharat.

Re: Classes..

Former Member — Tue, 11 Mar 2008 05:28:54 GMT

Hi,

This section contains explains how to work with methods in ABAP Objects. For precise details of the relevant ABAP statements, refer to the corresponding keyword documentation in the ABAP Editor. The example shows how to declare, implement, and call methods.

Declaring Methods

You can declare methods in the declaration part of a class or in an interface. To declare instance methods, use the following statement:

METHODS <meth> IMPORTING.. [VALUE(]<ii>[)] TYPE type [OPTIONAL]..

EXPORTING.. [VALUE(]<ei>[)] TYPE type [OPTIONAL]..

CHANGING.. [VALUE(]<ci>[)] TYPE type [OPTIONAL]..

RETURNING VALUE(<r>)

EXCEPTIONS.. <ei>..

and the appropriate additions.

To declare static methods, use the following statement:

CLASS-METHODS <meth>...

Both statements have the same syntax.

When you declare a method, you also define its parameter interface using the additions IMPORTING, EXPORTING, CHANGING, and RETURNING. The additions define the input, output, and input/output parameters, and the return code. They also define the attributes of the interface parameters, namely whether a parameter is to be passed by reference or value (VALUE), its type (TYPE), and whether it is optional (OPTIONAL, DEFAULT). Unlike in function modules, the default way of passing a parameter in a method is by reference. To pass a parameter by value, you must do so explicitly using the VALUE addition. The return value (RETURNING parameter) must always be passed explicitly as a value. This is suitable for methods that return a single output value. If you use it, you cannot use EXPORTING or CHANGING parameters.

As in function modules, you can use exception parameters (EXCEPTIONS) to allow the user to react to error situations when the method is executed.

Implementing Methods

You must implement all of the methods in a class in the implementation part of the class in a

METHOD <meth>.

...

ENDMETHOD.

block. When you implement the method, you do not have to specify any interface parameters, since these are defined in the method declaration. The interface parameters of a method behave like local variables within the method implementation. You can define additional local variables within a method using the DATA statement.

As in function modules, you can use the RAISE <exception> and MESSAGE RAISING statements to handle error situations.

When you implement a static method, remember that it can only work with the static attributes of your class. Instance methods can work with both static and instance attributes.

Calling Methods

To call a method, use the following statement:

CALL METHOD <meth> EXPORTING... <ii> =.<f i>...

IMPORTING... <ei> =.<g i>...

CHANGING ... <ci> =.<f i>...

RECEIVING r = h

EXCEPTIONS... <ei> = rc i...

The way in which you address the method <method> depends on the method itself and from where you are calling it. Within the implementation part of a class, you can call the methods of the same class directly using their name <meth>.

CALL METHOD <meth>...

Outside the class, the visibility of the method depends on whether you can call it at all. Visible instance methods can be called from outside the class using

CALL METHOD <ref>-><meth>...

where <ref> is a reference variable whose value points to an instance of the class. Visible instance methods can be called from outside the class using

CALL METHOD <class>=><meth>...

where <class> is the name of the relevant class.

When you call a method, you must pass all non-optional input parameters using the EXPORTING or CHANGING addition in the CALL METHOD statement. You can (but do not have to) import the output parameters into your program using the IMPORTING or RECEIVING addition. Equally, you can (but do not have to) handle any exceptions triggered by the exceptions using the EXCEPTIONS addition. However, this is recommended.

You pass and receive values to and from methods in the same way as with function modules, that is, with the syntax:

... <Formal parameter> = <Actual parameter>

after the corresponding addition. The interface parameters (formal parameters) are always on the left-hand side of the equals sign. The actual parameters are always on the right. The equals sign is not an assignment operator in this context; it merely serves to assign program variables to the interface parameters of the method.

If the interface of a method consists only of a single IMPORTING parameter, you can use the following shortened form of the method call:

CALL METHOD <method>( f).

The actual parameter <f> is passed to the input parameters of the method.

If the interface of a method consists only of IMPORTING parameters, you can use the following shortened form of the method call:

CALL METHOD <method>(....<ii> =.<f i>...).

Each actual parameter <f i > is passed to the corresponding formal parameter <i i >.

Event Handler Methods

Event handler methods are special methods that cannot all be called using the CALL METHOD statement. Instead, they are triggered using events. You define a method as an event handler method using the addition

... FOR EVENT <evt> OF <cif>...

in the METHODS or CLASS-METHODS statement.

The following special rules apply to the interface of an event handler method:

The interface may only consist of IMPORTING parameters.

Each IMPORTING parameter must be an EXPORTING parameter of the event <evt>.

The attributes of the parameters are defined in the declaration of the event <evt> (EVENTS statement) and are adopted by the event handler method.

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