type
TRow = seq[string]
TRows = seq[TRow]
proc dbGetRowsCb(arr: pointer; colCount: int32; values, columns:
cstringArray): int32 {.cdecl.} =
var cols:TRow
for i in 0..<colCount:
cols.add($values[i])
var arr = cast[ptr TRows](arr)
arr[].add(cols)
return 0
proc dbGetRows*(q:string): TRows =
var err:cstring=""
var arr: TRows
discard db.exec(q, dbGetRowsCb, result.addr, err)
if err != "":
echo err
free err
Run
In the dbGetRowsCb proc if i change the lines
var arr = cast[ptr TRows](arr)
arr[].add(cols)
Run
to
var arr = cast[ptr TRows](arr)[]
arr.add(cols)
Run
The sequence returned by dbGetRows is empty. Why??? Is it because the original
sequence, once dereferenced, is copied to "var arr", hence "cols" is not added
to it but to a copy which is deleted once the proc returns?
