一个老外的VBS连接ORACLE数据库资料

I have a VB app that connects successfully to a 10g database using the following code:
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,lr$Z)mF0Private m_Connection As Object51Testing软件测试网nVO lQY
sConnectionString = "PROVIDER=OraOLEDB.Oracle.1;USER ID=QUESTAPP;PASSWORD=xxxxx;DATA SOURCE=XOQLTEST;"51Testing软件测试网Z#K8L(YLa-H
...
%hO(h^f6J:N'O0Set m_Connection = CreateObject("ADODB.Connection")
(pn J@{C_0m_Connection.Open sConnectionString
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However I also have a c++ app that connects in an extremely familiar way but fails with the error 'Provider cannot be found' see code:
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{Q7d)Si"_0b_tConnectionString = _bstr_t("PROVIDER=OraOLEDB.Oracle.1;USER ID=QUESTAPP;PASSWORD=xxxxx;DATA SOURCE=XOQLTEST;");51Testing软件测试网/nwGD"R"F
...51Testing软件测试网-P&i']8W'c `
_ConnectionPtr spConnection;51Testing软件测试网#{"z"A8m%wv.Y
HRESULT hr = spConnection.CreateInstance(__uuidof( Connection ));
*?2nX [xv7sZ0spConnection->PutCursorLocation(adUseClient);51Testing软件测试网n!Q$v1p.PQ"W
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spConnection->Open(b_tConnectionString, L"", L"", adConnectUnspecified);
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E4z*c%e3G8h V0Anyone know why this would be the case? I am running both apps on the machine that hosts the database.