用SendMessage 向外部treeView发送 $WM_NOTIFY消息？

txxdhnt

Local $tNMHDR=DllStructCreate($tagNMHDR);Global Const $tagNMHDR = "struct; hwnd hWndFrom;uint_ptr IDFrom;INT Code; endstruct"
DllStructSetData($tNMHDR, "hwnd", $WinHwnd)
DllStructSetData($tNMHDR, "IDFrom",$IDFrom)
DllStructSetData($tNMHDR, "Code", $TVN_SELCHANGEDA)

;Global Const $tagNMTREEVIEW = $tagNMHDR & ";uint Action;" & _
;        "struct; uint OldMask;handle OldhItem;uint OldState;uint OldStateMask;" & _
;        "ptr OldText;int OldTextMax;int OldImage;int OldSelectedImage;int OldChildren;lparam OldParam; endstruct;" & _
;        "struct; uint NewMask;handle NewhItem;uint NewState;uint NewStateMask;" & _
;        "ptr NewText;int NewTextMax;int NewImage;int NewSelectedImage;int NewChildren;lparam NewParam; endstruct;" & _
;        "struct; long PointX;long PointY; endstruct"

Local $tNM_TREEVIEW= DllStructCreate($tagNMTREEVIEW)
DllStructSetData($tNM_TREEVIEW, "$tagNMHDR", $tNMHDR)
DllStructSetData($tNM_TREEVIEW, "NewhItem", $aryItemHwnd[6])
DllStructSetData($tNM_TREEVIEW, "Action", $TVN_SELCHANGEDA)

 _SendMessage( $WinHwnd, $WM_NOTIFY, $IDFrom,  $tNM_TREEVIEW)

前面的DllStructSetData($tNM_TREEVIEW, "$tagNMHDR", $tNMHDR)   这个语句对吗？如何向在结构中的结构SetData呢？