AHK (AutoHotKey) 连接字符串和变量

我有这个代码用于向 Autocad 发送命令。它工作正常。

{
GetAcad() ;Creates global variable ACAD where Application Object is stored
CADdoc:= ACAD.activedocument
Layer:= "0"
CADdoc.SendCommand("_-LAYER _SET " %Layer% " `n`n") ;;Uses COM 
CADdoc.SendCommand("_CHPROP _LA " %Layer% " `n`n")  ;;Uses COM
sleep, 50
send, {Escape}
sleep, 50
send, {Escape}
return
}

尝试使用 Layer 参数创建函数

ACADChangeLayer("Layer_Name") ;This is how is the function called

ACADChangeLayer(Layer)
{
  GetAcad()
  global ACAD   ;because I global variable has given value outside this function
  ACAD.activedocument.SendCommand("_-LAYER _SET " %Layer% " `n`n")
  ACAD.activedocument.SendCommand("_CHPROP _LA " %Layer% " `n`n")
  sleep, 50
  send, {Escape}
  sleep, 50
  send, {Escape}
}

没有按预期工作，尝试找出原因...

ACADChangeLayer(Layer)
  {
    GetAcad()
    global ACAD
    msgbox, % acad.activedocument.name
    msgbox, %Layer%
    CommandSetActiveLayer:= ("_-LAYER _SET " %Layer% " `n`n")
    msgbox, %CommandSetActiveLayer%
    ...
  }

1. 第一个 MsgBox 显示正确的 DocumentName ( drawing1.dwg)

2. 第二个 MsgBoxu 显示正确的 LayerName（Layer_Name- 请参见上面的第二个代码块）

3. 第三个 MsgBox 只显示变量 ( "_-LAYER _SET ")之前的部分为什么？

谢谢你的建议。