src/TortoiseShell/ShellExtClassFactory.cpp

   1 // TortoiseGit - a Windows shell extension for easy version control
   2
   3 // Copyright (C) 2003-2006, 2009-2011 - TortoiseSVN
   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
  24 CShellExtClassFactory::CShellExtClassFactory(FileState state)
  25 {
  26         m_StateToMake = state;
  27
  28         m_cRef = 0L;
  29
  30         InterlockedIncrement(&g_cRefThisDll);
  31 }
  32
  33 CShellExtClassFactory::~CShellExtClassFactory()
  34 {
  35         InterlockedDecrement(&g_cRefThisDll);
  36 }
  37
  38 STDMETHODIMP CShellExtClassFactory::QueryInterface(REFIID riid,
  39                                                                                                    LPVOID FAR *ppv)
  40 {
  41         if(ppv == 0)
  42                 return E_POINTER;
  43
  44         *ppv = NULL;
  45
  46         // Any interface on this object is the object pointer
  47
  48         if (IsEqualIID(riid, IID_IUnknown) || IsEqualIID(riid, IID_IClassFactory))
  49         {
  50                 *ppv = static_cast<LPCLASSFACTORY>(this);
  51                 AddRef();
  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         if(ppvObj == 0)
  78                 return E_POINTER;
  79
  80         *ppvObj = NULL;
  81
  82         // Shell extensions typically don't support aggregation (inheritance)
  83
  84         if (pUnkOuter)
  85                 return CLASS_E_NOAGGREGATION;
  86
  87         // Create the main shell extension object.  The shell will then call
  88         // QueryInterface with IID_IShellExtInit--this is how shell extensions are
  89         // initialized.
  90
  91         CShellExt* pShellExt = new (std::nothrow) CShellExt(m_StateToMake);  //Create the CShellExt object
  92
  93         if (NULL == pShellExt)
  94                 return E_OUTOFMEMORY;
  95
  96         const HRESULT hr = pShellExt->QueryInterface(riid, ppvObj);
  97         if(FAILED(hr))
  98                 delete pShellExt;
  99         return hr;
 100 }
 101
 102 STDMETHODIMP CShellExtClassFactory::LockServer(BOOL /*fLock*/)
 103 {
 104         return E_NOTIMPL;
 105 }