src/TortoiseShell/ShellExtClassFactory.cpp

   1 // TortoiseGit - a Windows shell extension for easy version control
   2
   3 // Copyright (C) 2003-2006 - Stefan Kueng
   4
   5 // This program is free software; you can redistribute it and/or
   6 // modify it under the terms of the GNU General Public License
   7 // as published by the Free Software Foundation; either version 2
   8 // of the License, or (at your option) any later version.
   9
  10 // This program is distributed in the hope that it will be useful,
  11 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 // GNU General Public License for more details.
  14
  15 // You should have received a copy of the GNU General Public License
  16 // along with this program; if not, write to the Free Software Foundation,
  17 // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18 //
  19 #include "stdafx.h"
  20 #include "ShellExt.h"
  21 #include "ShellExtClassFactory.h"
  22
  23 extern std::set<CShellExt *> g_exts;
  24
  25 CShellExtClassFactory::CShellExtClassFactory(FileState state)
  26 {
  27         m_StateToMake = state;
  28
  29         m_cRef = 0L;
  30
  31         g_cRefThisDll++;
  32 }
  33
  34 CShellExtClassFactory::~CShellExtClassFactory()
  35 {
  36         g_cRefThisDll--;
  37 }
  38
  39 STDMETHODIMP CShellExtClassFactory::QueryInterface(REFIID riid,
  40                                                                                                         LPVOID FAR *ppv)
  41 {
  42         *ppv = NULL;
  43
  44         // Any interface on this object is the object pointer
  45
  46         if (IsEqualIID(riid, IID_IUnknown) || IsEqualIID(riid, IID_IClassFactory))
  47         {
  48                 *ppv = (LPCLASSFACTORY)this;
  49
  50                 AddRef();
  51
  52                 return S_OK;
  53         }
  54
  55         return E_NOINTERFACE;
  56 }
  57
  58 STDMETHODIMP_(ULONG) CShellExtClassFactory::AddRef()
  59 {
  60         return ++m_cRef;
  61 }
  62
  63 STDMETHODIMP_(ULONG) CShellExtClassFactory::Release()
  64 {
  65         if (--m_cRef)
  66                 return m_cRef;
  67
  68         delete this;
  69
  70         return 0L;
  71 }
  72
  73 STDMETHODIMP CShellExtClassFactory::CreateInstance(LPUNKNOWN pUnkOuter,
  74                                                                                                         REFIID riid,
  75                                                                                                         LPVOID *ppvObj)
  76 {
  77         *ppvObj = NULL;
  78
  79         // Shell extensions typically don't support aggregation (inheritance)
  80
  81         if (pUnkOuter)
  82                 return CLASS_E_NOAGGREGATION;
  83
  84         // Create the main shell extension object.  The shell will then call
  85         // QueryInterface with IID_IShellExtInit--this is how shell extensions are
  86         // initialized.
  87
  88         CShellExt* pShellExt = new CShellExt(m_StateToMake);  //Create the CShellExt object
  89
  90         if (NULL == pShellExt)
  91                 return E_OUTOFMEMORY;
  92
  93         return pShellExt->QueryInterface(riid, ppvObj);
  94 }
  95
  96 STDMETHODIMP CShellExtClassFactory::LockServer(BOOL /*fLock*/)
  97 {
  98         return E_NOTIMPL;
  99 }