Source code of Windows XP (NT5)
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/////////////////////////////////////////////////////////////////////////////
// Binder.h : Declaration of CBinder - Provider binder for DS OLE DB Provider
//
#if (!defined(BUILD_FOR_NT40))
#ifndef __BINDER_H_
#define __BINDER_H_
/////////////////////////////////////////////////////////////////////////////
// CBinder
class ATL_NO_VTABLE CBinder :
INHERIT_TRACKING,
public CComObjectRootEx<CComMultiThreadModel>,
public CComCoClass<CBinder, &CLSID_ADSI_BINDER>,
public ISupportErrorInfo,
public IBindResource,
public IDBBinderProperties
{
public:
CBinder()
{
m_pUnkMarshaler = NULL;
m_pDataSource = NULL;
m_pSession = NULL;
m_pDBInitialize = NULL;
m_pOpenRowset = NULL;
}
DECLARE_GET_CONTROLLING_UNKNOWN()
BEGIN_COM_MAP(CBinder)
COM_INTERFACE_ENTRY(IBindResource)
COM_INTERFACE_ENTRY(IDBBinderProperties)
COM_INTERFACE_ENTRY(IDBProperties)
COM_INTERFACE_ENTRY_AGGREGATE(IID_IMarshal, m_pUnkMarshaler.p)
END_COM_MAP()
HRESULT FinalConstruct()
{
//Create Datasource object and get IDBInitialize interface.
HRESULT hr = CreateDataSource();
if (FAILED(hr))
RRETURN(hr);
//Create a session and get the IOpenRowset interface.
hr = CreateSession();
if (FAILED(hr))
RRETURN(hr);
//Now initialize binder properties
hr = InitializeProperties();
if (FAILED(hr))
RRETURN(hr);
//Create an instance of FTM (Free Threaded Marshaler).
//When aggregated, FTM makes it possible for this object
//to bypass standard marshaling (and use raw interface pointer)
//for intraprocess access and use standard marshaling
//for interprocess access.
//This FTM is aggregated above in the line:
//COM_INTERFACE_ENTRY_AGGREGATE(IID_IMarshal, m_pUnkMarshaler.p)
hr = CoCreateFreeThreadedMarshaler(
GetControllingUnknown(), &m_pUnkMarshaler.p);
RRETURN(hr);
}
void FinalRelease()
{
m_pUnkMarshaler.Release();
}
// ISupportsErrorInfo
STDMETHOD(InterfaceSupportsErrorInfo)(REFIID riid);
// IBindResource:
STDMETHODIMP Bind (
IUnknown * punkOuter,
LPCOLESTR pwszURL,
DBBINDURLFLAG dwBindFlags,
REFGUID rguid,
REFIID riid,
IAuthenticate * pAuthenticate,
DBIMPLICITSESSION * pImplSession,
DWORD * pdwBindStatus,
IUnknown ** ppUnk
);
// IDBBinderProperties : IDBProperties
STDMETHODIMP GetProperties(
ULONG cPropertyIDSets,
const DBPROPIDSET rgPropertyIDSets[ ],
ULONG *pcPropertySets,
DBPROPSET **prgPropertySets);
STDMETHODIMP GetPropertyInfo(
ULONG cPropertyIDSets,
const DBPROPIDSET rgPropertyIDSets[ ],
ULONG *pcPropertyInfoSets,
DBPROPINFOSET **prgPropertyInfoSets,
OLECHAR **ppDescBuffer);
STDMETHODIMP SetProperties(
ULONG cPropertySets,
DBPROPSET rgPropertySets[ ]);
STDMETHODIMP Reset( void);
public:
private:
//Internal methods
//Function for initializing Binder properties
HRESULT InitializeProperties();
//Function for getting Bind flags from initialization properties.
//This is used when IBindResource::Bind is called with dwBindFlags = 0
DWORD BindFlagsFromDbProps();
//Function to create a data source object - used only at construction time
HRESULT CreateDataSource();
//Function to create a session object - used only at construction time.
HRESULT CreateSession();
//Smart pointer to FTM.
CComPtr<IUnknown> m_pUnkMarshaler;
//Auto critical section.
auto_cs m_autocs;
//Implicitly created Data source object.
CDSOObject *m_pDataSource;
//pointer to DataSource's IDBInitialize interface.
auto_rel<IDBInitialize> m_pDBInitialize;
//Implicitly created Session object.
CSessionObject *m_pSession;
//pointer to Session's IOpenRowset interface.
auto_rel<IOpenRowset> m_pOpenRowset;
//object that manages properties for this binder instance.
CDBProperties m_dbProperties;
};
#endif //__BINDER_H_
#endif