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         : m_StateToMake(state)
  26         , m_cRef(0L)
  27 {
  28         InterlockedIncrement(&g_cRefThisDll);
  29 }
  30
  31 CShellExtClassFactory::~CShellExtClassFactory()
  32 {
  33         InterlockedDecrement(&g_cRefThisDll);
  34 }
  35
  36 STDMETHODIMP CShellExtClassFactory::QueryInterface(REFIID riid,
  37                                                                                                    LPVOID FAR *ppv)
  38 {
  39         if (!ppv)
  40                 return E_POINTER;
  41
  42         *ppv = nullptr;
  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 = static_cast<LPCLASSFACTORY>(this);
  49                 AddRef();
  50                 return S_OK;
  51         }
  52
  53         return E_NOINTERFACE;
  54 }
  55
  56 STDMETHODIMP_(ULONG) CShellExtClassFactory::AddRef()
  57 {
  58         git_libgit2_init();
  59         return InterlockedIncrement(&m_cRef);
  60 }
  61
  62 STDMETHODIMP_(ULONG) CShellExtClassFactory::Release()
  63 {
  64         if (InterlockedDecrement(&m_cRef))
  65                 return m_cRef;
  66
  67         delete this;
  68
  69         git_libgit2_shutdown();
  70
  71         return 0L;
  72 }
  73
  74 STDMETHODIMP CShellExtClassFactory::CreateInstance(LPUNKNOWN pUnkOuter,
  75                                                                                                    REFIID riid,
  76                                                                                                    LPVOID *ppvObj)
  77 {
  78         if (!ppvObj)
  79                 return E_POINTER;
  80
  81         *ppvObj = nullptr;
  82
  83         // Shell extensions typically don't support aggregation (inheritance)
  84
  85         if (pUnkOuter)
  86                 return CLASS_E_NOAGGREGATION;
  87
  88         // Create the main shell extension object.  The shell will then call
  89         // QueryInterface with IID_IShellExtInit--this is how shell extensions are
  90         // initialized.
  91
  92         CShellExt* pShellExt = new (std::nothrow) CShellExt(m_StateToMake);  //Create the CShellExt object
  93
  94         if (!pShellExt)
  95                 return E_OUTOFMEMORY;
  96
  97         const HRESULT hr = pShellExt->QueryInterface(riid, ppvObj);
  98         if(FAILED(hr))
  99                 delete pShellExt;
 100         return hr;
 101 }
 102
 103 STDMETHODIMP CShellExtClassFactory::LockServer(BOOL /*fLock*/)
 104 {
 105         return E_NOTIMPL;
 106 }