simpleext.cpp

Windows Shell扩展编程完全指南

// SimpleExt.cpp : Implementation of DLL Exports.

// Note: Proxy/Stub Information
//      To build a separate proxy/stub DLL, 
//      run nmake -f SimpleExtps.mk in the project directory.

#include "stdafx.h"
#include "resource.h"
#include <initguid.h>
#include "SimpleExt.h"

#include "SimpleExt_i.c"
#include "SimpleShlExt.h"

CComModule _Module;

BEGIN_OBJECT_MAP(ObjectMap)
OBJECT_ENTRY(CLSID_SimpleShlExt, CSimpleShlExt)
END_OBJECT_MAP()

/////////////////////////////////////////////////////////////////////////////
// DLL Entry Point

extern "C"
BOOL WINAPI DllMain(HINSTANCE hInstance, DWORD dwReason, LPVOID /*lpReserved*/)
{
    if (dwReason == DLL_PROCESS_ATTACH)
    {
        _Module.Init(ObjectMap, hInstance, &LIBID_SIMPLEEXTLib);
        DisableThreadLibraryCalls(hInstance);
    }
    else if (dwReason == DLL_PROCESS_DETACH)
        _Module.Term();
    return TRUE;    // ok
}

/////////////////////////////////////////////////////////////////////////////
// Used to determine whether the DLL can be unloaded by OLE

STDAPI DllCanUnloadNow()
{
    return (_Module.GetLockCount()==0) ? S_OK : S_FALSE;
}

/////////////////////////////////////////////////////////////////////////////
// Returns a class factory to create an object of the requested type

STDAPI DllGetClassObject(REFCLSID rclsid, REFIID riid, LPVOID* ppv)
{
    return _Module.GetClassObject(rclsid, riid, ppv);
}

/////////////////////////////////////////////////////////////////////////////
// DllRegisterServer - Adds entries to the system registry

STDAPI DllRegisterServer()
{
    // If we're on NT, add ourselves to the list of approved shell extensions.

    // Note that you should *NEVER* use the overload of CRegKey::SetValue with
    // 4 parameters.  It lets you set a value in one call, without having to 
    // call CRegKey::Open() first.  However, that version of SetValue() has a
    // bug in that it requests KEY_ALL_ACCESS to the key.  That will fail if the
    // user is not an administrator.  (The code should request KEY_WRITE, which
    // is all that's necessary.)

    if ( 0 == (GetVersion() & 0x80000000UL) )
        {
        CRegKey reg;
        LONG    lRet;

        lRet = reg.Open ( HKEY_LOCAL_MACHINE,
                          _T("Software\\Microsoft\\Windows\\CurrentVersion\\Shell Extensions\\Approved"),
                          KEY_SET_VALUE );

        if ( ERROR_SUCCESS != lRet )
            return E_ACCESSDENIED;

        lRet = reg.SetValue ( _T("SimpleShlExt extension"), 
                              _T("{5E2121EE-0300-11D4-8D3B-444553540000}") );

        if ( ERROR_SUCCESS != lRet )
            return E_ACCESSDENIED;
        }

    // registers object, typelib and all interfaces in typelib
    return _Module.RegisterServer(FALSE);
}

/////////////////////////////////////////////////////////////////////////////
// DllUnregisterServer - Removes entries from the system registry

STDAPI DllUnregisterServer()
{
    // If we're on NT, remove ourselves from the list of approved shell extensions.
    // Note that if we get an error along the way, I don't bail out since I want
    // to do the normal ATL unregistration stuff too.

    if ( 0 == (GetVersion() & 0x80000000UL) )
        {
        CRegKey reg;
        LONG    lRet;

        lRet = reg.Open ( HKEY_LOCAL_MACHINE,
                          _T("Software\\Microsoft\\Windows\\CurrentVersion\\Shell Extensions\\Approved"),
                          KEY_SET_VALUE );

        if ( ERROR_SUCCESS == lRet )
            {
            lRet = reg.DeleteValue ( _T("{5E2121EE-0300-11D4-8D3B-444553540000}") );
            }
        }

    return _Module.UnregisterServer(FALSE);
}