Converting ASM to Pascal

[Colin]

I guess the assembler does some checking for stack alignment to prevent problems with other 64-bit libs, this is an issue with the assembler unless it has an override option, maybe try

[32BIT]
push edi
push .. etc

as for the other code, does basicstring return a pchar/pointer? if so try

basicstring(resvalue)^ := ''

better still:

var
  p: PAnsiChar;

p := basicstring(resvalue);
args.outVal.n.sbuf := p;
p^ := ''