How to obtain the elevation data value according to the row and column number，After obtaining the IDISPATCH type？
I don’t know why the elevation value I get is always wrong

LPDISPATCH lpDispatch = m_map.get_GetObject(layerHandle);
//hr = lpDispatch->QueryInterface(IID_IDispatch, (void **)&typeinfo);
UINT count;
lpDispatch->GetTypeInfoCount(&count);
DISPID dispid;
DISPID PropertyID[5] = { 0 };
BSTR PropName[5];
PropName[0] = SysAllocString(L"Value");
PropName[1] = SysAllocString(L"row");
PropName[2] = SysAllocString(L"col");

lpDispatch->GetIDsOfNames(IID_NULL, PropName, 3, LOCALE_SYSTEM_DEFAULT, PropertyID);

VARIANTARG v[3];

v[0].lVal = 1000;
v[1].lVal = 710;
v[2].pintVal= &h ;
DISPPARAMS params = {v,NULL,2,0};

VARIANT vResult;

HRESULT ok = lpDispatch->Invoke(PropertyID[0], IID_NULL, LOCALE_SYSTEM_DEFAULT, DISPATCH_PROPERTYGET, &params, &vResult, NULL, NULL);
if (SUCCEEDED(ok))
{
TRACE("%d"，vResult.iVal);
}