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To gain more control over your code, make coding easier and less vulnerable to errors, and make IntelliSense functionality available for visual objects, class references, ActiveX controls, COM servers, and user-defined code elements, use strong typing. OLEPUBLIC type libraries also use strong typing.
 Note: |
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| Visual FoxPro is not a strongly typed language and does not require that you declare variables with a specific data types. Visual FoxPro does not enforce strong typing at design time or run time. |
For more information, see IntelliSense Support in Visual FoxPro.
To implement strong typing
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For objects, method parameters, and values, use the AS clause in the DEFINE CLASS command.
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For parameter and variable declarations, use the AS clause in following commands:
When you use the AS clause in code, IntelliSense displays a drop-down list of available types, including types from the following sources:
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Visual FoxPro object base classes.
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Visual FoxPro data types.
The following example uses the AS clause in the DEFINE CLASS command to implement strong typing for the custom OLEPUBLIC class and the method MyMethod:
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DEFINE CLASS MyClass1 AS Custom OLEPUBLIC
FUNCTION MyMethod (MyParam1 AS integer, MyParam2 AS string) AS integer
RETURN MyParam1
ENDFUNCTION
ENDDEFINE | |
The following example uses the AS clause in the LOCAL, PUBLIC, LPARAMETERS, PARAMETERS, and FUNCTION commands to implement strong typing:
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LOCAL oExcel AS "excel.application"
oExcel = CREATEOBJECT("excel.application")
oExcel. && Displays a list of members.
PUBLIC ARRAY MyArray[2] AS _form OF ffc\_base
LPARAMETERS MyParam1 AS String OF _Base.vcx
PARAMETERS MyParam1 AS Custom OF MyBase.vcx
FUNCTION MyFunction AS Custom | |