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js获取Com组件的字符串数组

2010-05-12 13:06 176 查看

1. COM相关接口函数实现, 接口getStepArray

typedef struct tagStepInfo{
int iDigit;
CComBSTR bstrText;
}SETPINFO;

STDMETHODIMP CXXX::getStepArray(VARIANT *pVariant)
{
// TODO: Add your implementation code here
SETPINFO stSInfo;
PackStep(pVariant, stSInfo);

return S_OK;
}
//打包SETPINFO到Variant变量;
HRESULT CXXXXX::PackStep(VARIANT *pVariant, SETPINFO stSInfo)
{
long i = 0;
HRESULT hr = S_OK;
SAFEARRAY* pArray = NULL;
VARIANT var;

pArray = SafeArrayCreateVector(VT_VARIANT, 0, 2);
if (pArray == NULL){
return -1;
}

VariantInit(&var);
var.vt = VT_I4;
var.lVal = stSInfo.iDigit;
//转换为BSTR字符串类型
::VariantChangeType(&var, &var, 0, VT_BSTR);
hr = SafeArrayPutElement(pArray, &i, &var);
if (FAILED(hr)){
SafeArrayDestroy( pArray );
return -1;
}
++i;

var.bstrVal = stSInfo.bstrText.Copy();
hr = SafeArrayPutElement(pArray, &i, &var);
if (FAILED(hr)){
SafeArrayDestroy( pArray );
return -1;
}
++i;

VariantInit(pVariant);
VariantClear(&var);
pVariant ->vt = VT_ARRAY | VT_VARIANT;
pVariant ->parray = pArray;

return 0;
}

2. html代码实现, 采用javascript调用COM接口获取到数组为VBArray,需要将其转换为JSArray

<html>
<body>
<script language=javascript>
if (document.AtlComId){
var vbArray = document.AtlComId.getStepArray();
var jsArray = vbArray.toArray();
alert(jsArray);
}
</script>
<object classid="clsid:XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX" id="AtlComId"
width="100" height="100">
</object>
</body>
<html>

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