Pointers and Structures in BASIC+

DLL functions often pass parameters by reference and therefore require pointers to BASIC+ variable data.

Pointer/Structure	Description
Blank_Struct()	Builds a blank structure to pass to a DLL which will then fill in the structure's elements.
Build_Struct()	Assembles a binary structure out of BASIC+ variables.
Declare_FCNS routine	Compiles a .DLL definition record into BASIC+ callable functions.
Define_Struct routine	Starts the Structure Designer tool.
GetPointer()	Returns a pointer to the actual data of a BASIC+ variable. Refer to LockVariable, below.
GetValue()	De-references a pointer and copies the data to a BASIC+ variable of a specified type.
LockVariable statement	Locks a variable so its data does not move in memory.
Parse_Struct subroutine	Extracts elements from a structure into BASIC+ variables.
Struct_Flush subroutine	Flushes any cached structure definitions.
Struct_Len()	Returns the length in bytes of a structure based on the structure's definition.
Struct_To_Var()	Converts a binary structure to a dynamic array, placing each element from the structure into the corresponding field.
UnlockVariable statement	Unlocks a BASIC+ variable locked by LockVariable.
Var_To_Struct()	Converts an @fm-delimited variable into a structure placing, obtaining each structure element from the corresponding field in the variable.

For more information on DLLs, refer to Chapter 7: Calling DLLs from BASIC+.