Scripting Guide - SAS

Appendix B Messages 777
Dynamic Link Libraries (DLLs)
access_mode is an optional keyword that specifies how the argument is passed. input specifies that
the argument is passed by value. output specifies that the argument is passed by address with the
initial value undefined. update specifies that the argument is passed by reference and the value of the
JSL variable is set as the initial value. The default value is input.
array is an optional keyword. It is valid only if the Type is specified as Double and the access_mode
is specified as either input or update. Specifies that the exported function expects an array of
doubles.
Convention(calling_convention) An optional keyword that specifies the calling convention:
STDCALL or PASCAL, or CDECL. The default value is STDCALL. STDCALL and PASCAL are equivalent.
MaxArgs(n) An optional integer that specifies the maximum number of arguments that can be
supplied.
MinArgs(n) An optional integer that specifies the minimum number of arguments that can be
supplied.
Returns(type) Optional. Specifies the data type that the function returns: Int8, UInt8, Int16,
UInt16, Int32, UInt32, Int64, UInt64, Float, Double, AnsiString, UnicodeString,
Struct, IntPtr, UIntPtr, or ObjPtr.
StackOrder(order) Optional keyword that specifies the order in which arguments are to be placed
on the stack when calling the function. Valid values are L2R (left-to-right) and R2L (right-to-left).
The default value is R2L.
StackPop(pop) Optional keyword that specifies how the exported function expects the stack to be
cleared after the function returns. Valid values are CALLER and CALLEE. The default value is CALLEE.
StructArg(Arg(...), , ..., , ,
) Optional and can appear multiple times. If an exported DLL function requires
that a structure argument be passed in as a parameter, use StructArg to declare the structure
members. The parameters to StructArg are Arg arguments using the same syntax as above for Arg
arguments to DeclareFunction (one for each structure member), an access_mode indicator and a
pack_mode indicator.
access_mode is an optional keyword that indicates whether the struct argument should be passed by
value (input) or by reference (update).
pack_mode is an optional integer that determines how the structure is packed. Valid values are 1, 2,
4, 8, and 16. The default value is 8.
"description" is an optional, quoted string that contains a description of the structure for
reference.
dll object