Function declarations

For functions programmed within a DLL to be accessible to other programs, they must be declared as external functions � that is, they must be declared with the keyword EXTERN. For example:

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4GL form sections

Note

Only the form.all section is relevant to dynamic forms. For dynamic forms, use the group sections instead.

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Function overloading

When DLLs are dynamically linked at runtime, instead of at compile time, function overloading is possible. This means that an external function contained in a loaded DLL can be replaced by overloading another DLL that contains a function with the same name and arguments.

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4GL group sections

With dynamic forms, the mapping of groups to forms is not fixed. Consequently, the only form sections that are relevant to dynamic forms are the form.all and form.1 sections. When dealing with dynamic forms, you use group sections instead of form sections

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Object information tool

To display information about an object, use the object information tool bic_info6.2. Note that maximum information is displayed when the object has been compiled with the debug option.

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4GL main table i/o sections

Note that main.table.io sections (except the read.view subsection) are ignored when the corresponding DAL hooks are programmed in a DAL script.

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Dynamic-link libraries

BaanERP Tools supports the use of dynamic-link libraries (DLLs). A DLL consists of a library of functions that are compiled, linked, and stored separately from the processes that use them. The functions are resources that can be shared by multiple programs that are running concurrently. Only one copy of the DLL needs to be present in memory. Each program that uses the DLL links to it at runtime, at the time it calls one of the DLL�s functions.

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program sections

Program sections have no subsections.
The following program sections are available:

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Scope of variables across DLLs

Global variables

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Symbolic constants

A symbolic constant is used in your program as a symbolic name, but at runtime it has a fixed value. The defined constants are:

       FALSE   The actual value is 0
       TRUE    The actual value is 1
       PI      The actual value is 3.141592653589793

Note that if FALSE and TRUE are used as boolean values (for example, as a result of expressions), they mean zero and not zero respectively.

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