c++ - DAO code for Microsoft access works in Visual Studio 2008 but not in Visual Studio 2012 -

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i have following line of code in example project downloaded , opened in visual studio 2008

_bstr_t bstrconnect = "path mdb file";  int _tmain(int argc, _tchar* argv[]){ hresult hr = coinitialize(null); if (failed(hr)) {     cout<<dam<<": failed coinitialize() com."<<endl;     return hr; }  dao::_dbengine* pengine = null;  hr = cocreateinstance(     __uuidof(dao::dbengine),     null,     clsctx_all,     iid_idispatch,     (lpvoid*)&pengine); if (succeeded(hr) && pengine) {     try     {         dao::databaseptr pdbptr = null;         pdbptr = pengine->opendatabase(bstrconnect);

this code works. put similar code in visual studio 2012 project

_bstr_t bstrconnect = "path mdb file";  int _tmain(int argc, _tchar* argv[]) { hresult hr = coinitializeex(null, coinit_multithreaded); if (failed(hr)) {     cout<<"failed coinitialize() com."<<endl;     cout << _com_error(hr).errormessage() << endl;     return hr; }  dao::_dbengine* pengine = null;  hr = cocreateinstance(     __uuidof(dao::dbengine),     null,     clsctx_all,     iid_idispatch,     (lpvoid*)&pengine);  if (succeeded(hr) && pengine) {     try     {         dao::databaseptr pdbptr = null;         pdbptr = pengine->opendatabase(bstrconnect);

in 2012 version system.accessviolationexception when call pengine->opendatabase. there need change in 2012 code? had coinitialize in 2012 version kept returning error until switched coinitializeex.


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