Invalid Pointer When Using Ado In A Dll

Hello, I am working on a dll that is being loaded by browsers. I have to check if the hostname of a requested page is in a database containing sites that have to be blocked. I am using the following code to connect to the db:


Code Block


BOOL check(WCHAR *wszHost)
{
BOOL ret = FALSE;
_ConnectionPtr pConn = NULL;
_CommandPtr pCmd = NULL;
_RecordsetPtr pRs = NULL;
try
{
pConn.CreateInstance(__uuidof(Connection));
pCmd.CreateInstance(__uuidof(Command));
pRs.CreateInstance (__uuidof (Recordset));
pConn->Open(_bstr_t(L"Provider=MSDASQL.1;Data Source="C:\Deny.mdb"), _bstr_t(L""), _bstr_t(L""), adOpenUnspecified);
pCmd->ActiveConnection = pConn;
pCmd->CommandType = adCmdText;
wcscpy_s(query, 2*_MAX_PATH, L"SELECT site FROM Allow WHERE site='");
wcscat_s(query, 2*_MAX_PATH, wszHost);
wcscat_s(query, 2*_MAX_PATH, L"'");
pCmd->CommandText = (_bstr_t)query;
pRs->CursorLocation = adUseClient;
pRs->Open((IDispatch*)pCmd, vtMissing, adOpenStatic, adLockReadOnly, adCmdText);
if(pRs->RecordCount > 0)
ret = TRUE;
}
catch(_com_error error)
{
dbgprint(" Description = %s
", (char*) error.Description());
dbgprint(" Source = %s
", (char*) error.Source());
dbgprint(" Code = %08lx
", error.Error());
dbgprint(" Code meaning = %s
", error.ErrorMessage());
return FALSE;
}
catch(...)
{
dbgprint(" Unhandled error!");
return FALSE;
}
}

Hel

The strange thing is that this code is running fine with Internet Explorer but when the dll is loaded by Firefox pConn->Open() fails with Invalid pointer error. Any suggestions will be greatly appreciated. Thank you.Martin