Difference between revisions of "SDK Overview of Level 4"

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==SEE ALSO==
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==Level 4 Functions==
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[[DEFINE_CLASS()]], [[DEFINE_METHOD()]], [[DEFINE_PROPERTYGET()]], [[DEFINE_PROPERTYSET()]], [[DISPATCH_FACTORY()]], [[DISPATCH_METHOD()]], [[DISPATCH_PROPGET()]], [[DISPATCH_PROPSET()]], [[OBJECT_ASSIGN()]], [[OBJECT_DELETE()]], [[OBJECT_GETARG()]], [[OBJECT_GETARGC()]], [[OBJECT_GETDATA()]], [[OBJECT_GETOBJECT()]], [[OBJECT_GETPARAMETER()]], [[OBJECT_GETPROPERTY()]], [[OBJECT_GETTYPE()]], [[OBJECT_GETVALUE()]], [[OBJECT_NEW()]], [[OBJECT_RETERROR()]], [[OBJECT_RETPROPERTY()]], [[OBJECT_RETRESULT()]], [[OBJECT_SETARG()]], [[OBJECT_SETDATA()]], [[OBJECT_SETPROPERTY()]]
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{| class="wikitable"
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!Function level 4||Description
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|-
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|[[DEFINE_CLASS()]]||Define a class
 +
|-
 +
|[[DEFINE_PROPERTYGET()]]||Define a get property
 +
|-
 +
|[[DEFINE_PROPERTYSET()]]||Define a set property
 +
|-
 +
|[[DEFINE_METHOD()]]||Define a method
 +
|-
 +
|[[DISPATCH_FACTORY()]]||Dispatch a factory method
 +
|-
 +
|[[DISPATCH_PROPGET()]]||Dispatch a get property
 +
|-
 +
|[[DISPATCH_PROPSET()]]||Dispatch a set property
 +
|-
 +
|[[DISPATCH_METHOD()]]||Dispatch a method
 +
|-
 +
|[[OBJECT_ASSIGN()]]||Assign a new object
 +
|-
 +
|[[OBJECT_DELETE()]]||Delete an existing object
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|-
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|[[OBJECT_GETARG()]]||Get argument value
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|-
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|[[OBJECT_GETARGC()]]||Get the number of arguments
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|-
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|[[OBJECT_GETDATA()]]||Get object's data area
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|-
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|[[OBJECT_GETOBJECT()]]||Get an object
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|-
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|[[OBJECT_GETPARAMETER()]]||Get parameter value
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|-
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|[[OBJECT_GETPROPERTY()]]||Get property value
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|-
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|[[OBJECT_GETTYPE()]]||Get parameter type
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|-
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|[[OBJECT_GETVALUE()]]||Get value to set property to
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|-
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|[[OBJECT_NEW()]]||Create a new object
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|-
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|[[OBJECT_RETERROR()]]||Return error
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|-
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|[[OBJECT_RETPROPERTY()]]||Return property value
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|-
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|[[OBJECT_RETRESULT()]]||Return the value of a result
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|-
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|[[OBJECT_SETARG()]]||Set argument value
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|-
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|[[OBJECT_SETDATA()]]||Set object's data area
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|-
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|[[OBJECT_SETPROPERTY()]]||Set property value
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|-
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|}
  
  

Revision as of 12:54, 30 March 2009

Level 4 Functions

Function level 4 Description
DEFINE_CLASS() Define a class
DEFINE_PROPERTYGET() Define a get property
DEFINE_PROPERTYSET() Define a set property
DEFINE_METHOD() Define a method
DISPATCH_FACTORY() Dispatch a factory method
DISPATCH_PROPGET() Dispatch a get property
DISPATCH_PROPSET() Dispatch a set property
DISPATCH_METHOD() Dispatch a method
OBJECT_ASSIGN() Assign a new object
OBJECT_DELETE() Delete an existing object
OBJECT_GETARG() Get argument value
OBJECT_GETARGC() Get the number of arguments
OBJECT_GETDATA() Get object's data area
OBJECT_GETOBJECT() Get an object
OBJECT_GETPARAMETER() Get parameter value
OBJECT_GETPROPERTY() Get property value
OBJECT_GETTYPE() Get parameter type
OBJECT_GETVALUE() Get value to set property to
OBJECT_NEW() Create a new object
OBJECT_RETERROR() Return error
OBJECT_RETPROPERTY() Return property value
OBJECT_RETRESULT() Return the value of a result
OBJECT_SETARG() Set argument value
OBJECT_SETDATA() Set object's data area
OBJECT_SETPROPERTY() Set property value


Macros

Level 4 DEFINE_XXX macros are used for defining classes and their associated methods that can be instantiated from the Recital 4GL. The DISPATCH_XXX macros are used to dispatch method calls in an OBJARG format to the specified methods. The OBJECT_XXX macros are use to access and return values passed to and from the object.


OBJARG

The OBJARG format is stored in a string in the format "X:ASCII" where 'X' can be any one of the following:


TYPE DESCRIPTION
E Error
C Character
N Numeric
L Logical
D Date
T Datetime
Y Currency
O Object


OBJPTR

This macro is the pointer to an instantiated object defined by the class.


Object Data Structures

Public properties and methods need to be defined a structure for introspection called public_properties and public_methods. The structures are in an OBJARG format except for the last item which must be defined as an empty string. The string part of the OBJARG is defined as "Name;Type;Description", for example: 


static	char	*public_properties[] = {
	"C:CHARVALUE;C;Character property value",
	"C:NUMVALUE;N;Numeric property value",
	"C:LOGVALUE;L;Logical property value",
	"C:DATEVALUE;D;Date property value",
	"C:TIMEVALUE;T;DateTime property value",
	"C:CURRVALUE;Y;Currency property value",
	"C:OBJVALUE;O;Object property value", "",
};
 
static	char	*public_methods[] = {
	"C:DEFINE;L;Define settings in exception",
	"",
};


Return codes

The macros OBJECT_ERROR and OBJECT_SUCCESS are defined to be used to return the result of a method call.

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