DllStructSetData Issue

[xroot]

Can someone tell me what is going wrong, why "LoadMenuIndirect" can't return a menu handle when I use the

$SM structure but returns a menu handle when I use $SM2 structure.

I can not see the difference between the two structures, only the way I load them and the data

dump of each structure are equal.(see output)

Struct $SM Ptr=0x01AD025C Menu hWnd=0x00000000 LoadMenuIndirect=The operation completed successfully.

Struct $SM2 Ptr=0x01ACFD78 Menu hWnd=0x006D0369 LoadMenuIndirect=The operation completed successfully.

Struct $SM Data=0x000000009000460069006C006500000000009001410062006F007500740042006F007800000000000000000080009101450078006900740000000

Struct $SM2 Data=0x000000009000460069006C006500000000009001410062006F007500740042006F007800000000000000000080009101450078006900740000000

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#Include <WinAPI.au3>

Func Set_Menu($Type,$mTit,$MEM=128)
    If $Mflag Then
        Global $SM=DllStructCreate("byte["&$MEM&"]"),$pSM=DllStructGetPtr($SM)
        $Mflag=0
    EndIf
    $pSM+=$POS
    $POS=6
    DllStructSetData(DllStructCreate("byte[8]",$pSM),1,0)
    DllStructSetData(DllStructCreate("byte[4]",$pSM+4),1,$Type)
    DllStructSetData(DllStructCreate("wchar["&StringLen($mTit)&"]",$pSM+$POS),1,$mTit)
    $POS+=StringLen($mTit)*2+2
    Return
EndFunc

Func Set_Item($Type=0,$mID=0,$mTit="")
    $pSM+=$POS
    $POS=4
    DllStructSetData(DllStructCreate("byte[4]",$pSM),1,$Type)
    DllStructSetData(DllStructCreate("byte[4]",$pSM+2),1,$mID)
    DllStructSetData(DllStructCreate("wchar["&StringLen($mTit)&"]",$pSM+$POS),1,$mTit)
    $POS+=StringLen($mTit)*2+2
    Return
EndFunc

$xMenu="0x000000009000460069006C006500000000009001410062006F007500740042006F0078"& _
       "00000000000000000080009101450078006900740000000000000000"
Global $SM2=DllStructCreate("byte["&StringLen($xMenu)&"]"),$pSM2=DllStructGetPtr($SM2)
DllStructSetData($SM2,1,$xMenu)

Global $Mflag=1,$Pos=0

Set_Menu(144,"File")
Set_Item(0,400,"AboutBox")
Set_Item()  ;Seperator
Set_Item(128,401,"Exit")

$Menu=DllCall("user32.dll","hwnd","LoadMenuIndirectA","ptr",$pSM)
consolewrite("Struct $SM  Ptr="&$pSM&" Menu hWnd="&$Menu[0]&" LoadMenuIndirect="&_WinAPI_GetLastErrorMessage())
$Menu=DllCall("user32.dll","hwnd","LoadMenuIndirectA","ptr",$pSM2)
consolewrite("Struct $SM2 Ptr="&$pSM2&" Menu hWnd="&$Menu[0]&" LoadMenuIndirect="&_WinAPI_GetLastErrorMessage())
consolewrite("Struct $SM  Data="&DllStructGetData($SM,1)&@lf&"Struct $SM2 Data="&DllStructGetData($SM2,1))