Arrays of Dynstructs
As noted above in Declare a DYNSTRUCT Variable, the dynstruct type currently only supports mapped scalar variables; no arrays, mapped or dimx. However, as also noted, you can work around this limitation by copying freely between dynstructs and arrays of traditional structures or X variables. In this example, we retrieve instances of ST_TEST structures—defined in the example Define a Dynstruct from a String—from a function, copying each to an array of type X that was previously dimensioned to match the size of ST_TEST. Then we reverse the operation, copying elements out of the array back into the scalar dynstruct variable to print the members.
map1 dsdef$,s,0 ! string to hold definition source
map1 fields,i,2 ! # fields (signed to allow error codes)
map1 stsize,b,4 ! size of the structure
map1 errmsg$,s,100 ! error messages
map1 ds, DYNSTRUCT ! var to contain the dynstruct ST_TEST
! assume dsdef$ string already built to define ST_TEST (see first example)
! now define it and get the size
fields = Fn'Dynst'Define(dsdef$,stsize,"ST_TEST",errmsg$)
if fields > 0 then
dimx testarray(0), X, stsize, auto_extend ! array to match dynstruct size
do while <some condition>
ds = Fn’Get’Structure’Data$("ST_TEST") ! get data into the ds from somewhere
i += 1
testarray(i) = ds ! copy it into our unformatted array
loop
! now reverse process, copying from the X array to our ds var
do while i > 0
ds = testarray(i)
? ds.sku
? ds.price.retail
? ds.notes(1)
? ds.@fname
! etc
Loop
Endif
