VB向VC++的COM中传递数组的有关问题

VB向VC++的COM中传递数组的问题
//VB向COM传递数组
//这段代码的意思是，传进来的数组元素是BSTR类型的，得到每个元素，组成一个新的BSTR串，在返回给SetArr方法

C/C++ code

STDMETHODIMP CArr::SetArr(VARIANT *pIn, VARIANT *pRet){    AFX_MANAGE_STATE(AfxGetStaticModuleState())    SAFEARRAY *psa=*(pIn->pparray);//获取从外部传递进来的数组，要用pparray，区别在于此    CComBSTR tmp;    long lBound,uBound;    SafeArrayGetLBound(psa,1,&lBound);    SafeArrayGetUBound(psa,1,&uBound);    for(long i=lBound;i<=uBound;i++)    {        VARIANT var;        SafeArrayGetElement(psa,&i,&var);        if(tmp.Length()==0)tmp.AppendBSTR(var.bstrVal);        else        {            tmp.AppendBSTR(SysAllocString(L","));            tmp.AppendBSTR(var.bstrVal);        }    }    pRet->vt=VT_BSTR;    pRet->bstrVal=tmp.Copy();    return S_OK;}

在ASP中调用没有问题：

<%
'向COM中传递数组
dim newArr(6)
newArr(0)="1111111"
newArr(1)="2222222"
newArr(2)="3333333"
newArr(3)="4444444"
newArr(4)="5555555"
newArr(5)="6666666"
newArr(6)="7777777"

str=obj.setArr(newArr)
response.write str
%>

可在VB中死活不行：

VB code

Private Sub Command1_Click()Set obj = CreateObject("TestVar.Arr")Dim arr(0 To 3) As Stringarr(0) = CStr("aaa")arr(1) = CStr("bbb")arr(2) = CStr("ccc")Dim var As Variant'var = obj.SetArr(arr)'var = obj.SetArr(VarPtr(arr(0)))var = obj.SetArr(arr(0))MsgBox CStr(var)End Sub

是我哪里弄错了呢？
非常感谢


[解决办法]
Dim arr(0 To 3) As String
试试改为
Dim arr(0 To 3) As Variant
[解决办法]
试试这样：

Private Sub Command1_Click()

Set obj = CreateObject("TestVar.Arr")

Dim arr As Variant
arr =array(CStr("aaa"),CStr("bbb"),CStr("ccc"))

var = obj.SetArr(arr)

'MsgBox CStr(var)
End Sub



[解决办法]
试试这个:

VB code

Private Sub Command1_Click()    Dim obj    Set obj = CreateObject("TestCom.Test")        Dim arr(0 To 3) As Variant    arr(0) = "aaa"    arr(1) = "bbb"    arr(2) = "ccc"        Dim var As Variant    var = obj.SetArr(arr)    'var = obj.SetArr(VarPtr(arr(0)))    'var = obj.SetArr(arr(0))        MsgBox CStr(var)End Sub
[解决办法]
VB code
Dim arr() As StringRedim arr(0 to 2)arr(0) = CStr("aaa")arr(1) = CStr("bbb")arr(2) = CStr("ccc")Dim var As Variantvar = obj.SetArr(arr) 

 

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