Implementation of the 'yield' operator [HELP]

I try to implement the python/c# yield operator in asm, but failed. Yield is multiple returning a value. [EDIT: Almost succeded]

Code:

format pe console 5.0
entry start

include 'C:\Program Files\FASM\include\win32a.inc'

fmt           db '%i',10,13,0
buff          rb 128

; print ints()
;
; sub ints()
; for i = 1 to 5
;     yield i
; next i
; end sub

macro yield val {
       mov    eax, val ; eax = current yield return value
       pushad          ; save all registers
       push   @f       ; [esp-4] = pointer to next opcode          [1]
       push   @b       ; [esp-0] = pointer to next yield operation [2]
       ret
@@:  ; [1]
       popad           ; load all registers
}


start:
       call   ints
@@: ; [2]
       invoke wsprintf,buff,fmt,eax
       add    esp, 4*3

       invoke WriteFile,7,buff,eax,0,0
       ret             ; continue the code in yield, jumps to [esp-0] [1]

       invoke ExitProcess,0

;proc intmul
;       push   ebp
;       mov    ebp, esp
;
;       call   ints
;       imul   eax, 5
;       yield  eax
;
;       mov    esp, ebp
;       pop    ebp
;       ret
;endp

proc ints
       push   ebp
       mov    ebp, esp

       mov    ecx, 1
@next:
       yield  ecx

       add    ecx, 1
       cmp    ecx, 5
       jng    @next

       invoke ExitProcess,0

       mov    esp, ebp
       pop    ebp
       ret
endp













section '.idata' import data readable

library kernel32,'KERNEL32.DLL',\
        user32,  'USER32.DLL'

include 'c:\program files\fasm\include/api/kernel32.inc'
include 'c:\program files\fasm\include/api/user32.inc'