delphi - Why TRttiField.GetValue fails to fill result? -


i have complex nested record type. need monitor changes in values of it's fields after method call. used rtti (originally copied here):

procedure comparefields(const rec1, rec2: pointer; const recttypeinfo: trttitype;   const basename: string; const baseoffset: integer; const lines: tstrings); var   r1field, r2field: pointer;   myfield: trttifield;   state: string;   path: string; begin   if recttypeinfo.typekind = tkrecord   begin     myfield in recttypeinfo.getfields     begin       r1field := pointer(integer(rec1) + baseoffset + myfield.offset);       r2field := pointer(integer(rec2) + baseoffset + myfield.offset);       if comparemem(r1field, r2field, myfield.fieldtype.typesize)         state := '=='        else          state :=  '<>';       path := basename + '.' + myfield.name;        lines.add(format('%2s | %-20s | +%2d | %10s[%2d] | %22s | %22s', [state, path,         baseoffset + myfield.offset,         myfield.fieldtype.tostring,         myfield.fieldtype.typesize,         myfield.getvalue(r1field).tostring,         myfield.getvalue(r2field).tostring]));        if myfield.fieldtype.typekind = tkrecord         comparefields(rec1, rec2, myfield.fieldtype, path, baseoffset + myfield.offset, lines);     end;   end; end;

the comparemem part works fine , indicates fields have been changed. problem reporting values of tow record. myfield.getvalue(r1field).tostring times return random value , that's because myfield.getvalue(r1field) fill result random values. sample demonstrates problem:

type   tmyrec1 = record     f11: integer;     f12: boolean;     f13: double;   end;    tmyrec2 = record     f21, f22: tmyrec1;     f23: integer;     f24: tmyrec1;   end;  procedure tform1.button1click(sender: tobject); var   mycontext: trtticontext;   rec1, rec2: tmyrec2; begin   fillchar(rec1, sizeof(rec1), #0);   fillchar(rec2, sizeof(rec1), #0);    comparefields(@rec1, @rec2, mycontext.gettype(typeinfo(tmyrec2)), 'tmyrec2', 0,     memo1.lines);  end;

and result is:

== | tmyrec2.f21          | + 0 |    tmyrec1[16] |               (record) |               (record) == | tmyrec2.f21.f11      | + 0 |    integer[ 4] |                      0 |                      0 == | tmyrec2.f21.f12      | + 4 |    boolean[ 1] |                  false |                  false == | tmyrec2.f21.f13      | + 8 |     double[ 8] |                      0 |                      0 == | tmyrec2.f22          | +16 |    tmyrec1[16] |               (record) |               (record) == | tmyrec2.f22.f11      | +16 |    integer[ 4] |                      0 |                      0 == | tmyrec2.f22.f12      | +20 |    boolean[ 1] |                  false |                  false == | tmyrec2.f22.f13      | +24 |     double[ 8] |                      0 |                      0 == | tmyrec2.f23          | +32 |    integer[ 4] |               21013568 |                      0 <<-- == | tmyrec2.f24          | +40 |    tmyrec1[16] |               (record) |               (record) == | tmyrec2.f24.f11      | +40 |    integer[ 4] |                      0 |                      0 == | tmyrec2.f24.f12      | +44 |    boolean[ 1] |                  false |                  false == | tmyrec2.f24.f13      | +48 |     double[ 8] |  9.92338439963001e-303 |                      0 <<--

as can see tmyrec2.f23 , tmyrec2.f24.f13 seem have values other '0' after calling fillchar!


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