Usage of DLL Custum Data Structure (VBS)

The following code generates an Err when a string is affected to the structure field called tTmpParam.sKeyword. May you tell me the correct syntax to use in order to handle this tTmpParam.sKeyword field?

Thank you in advance.

Dim typeParamId2

typeParamId2 = DLL.DefineType("typeParam2",_

                                vt_lpstr, "sKeyword",_  

                                vt_lpstr, "sValue",_

                                vt_i4, "ivalue")

Sub AfficheParam

    '---------------------------------------------------------------------------------------- 

    On Error Resume Next

    '----------------------------------------------------------------------------------------

    Dim tTmpParam, tempstr

    Set tTmpParam = DLL.New("typeParam2")

    Set tempstr = DLL.New("LPSTR",256)

    Set tTmpParam.sKeyword = DLL.New("LPSTR",256)

    tTmpParam.ivalue = 15

    MsgBox Cstr(tTmpParam.ivalue)

    tempstr.Text = "MessageTempStr"

    MsgBox tempstr.Text

    tTmpParam.sKeyword.Text = "MessagesKeyword"

    MsgBox tTmpParam.sKeyword.Text



    MsgBox "Error  : " & Err & Err.Description

End Sub