src/TortoiseOverlays/ShellExtClassFactory.cpp

   1 // TortoiseOverlays - an overlay handler for Tortoise clients
   2 // Copyright (C) 2007 - TortoiseSVN
   3 #include "stdafx.h"
   4 #include "ShellExt.h"
   5 #include "ShellExtClassFactory.h"
   6
   7
   8 CShellExtClassFactory::CShellExtClassFactory(FileState state)
   9 {
  10     m_StateToMake = state;
  11
  12     m_cRef = 0L;
  13
  14     g_cRefThisDll++;
  15 }
  16
  17 CShellExtClassFactory::~CShellExtClassFactory()
  18 {
  19     g_cRefThisDll--;
  20 }
  21
  22 STDMETHODIMP CShellExtClassFactory::QueryInterface(REFIID riid,
  23                                                    LPVOID FAR *ppv)
  24 {
  25     *ppv = NULL;
  26
  27     // Any interface on this object is the object pointer
  28
  29     if (IsEqualIID(riid, IID_IUnknown) || IsEqualIID(riid, IID_IClassFactory))
  30     {
  31         *ppv = (LPCLASSFACTORY)this;
  32
  33         AddRef();
  34
  35         return NOERROR;
  36     }
  37
  38     return E_NOINTERFACE;
  39 }
  40
  41 STDMETHODIMP_(ULONG) CShellExtClassFactory::AddRef()
  42 {
  43     return ++m_cRef;
  44 }
  45
  46 STDMETHODIMP_(ULONG) CShellExtClassFactory::Release()
  47 {
  48     if (--m_cRef)
  49         return m_cRef;
  50
  51     delete this;
  52
  53     return 0L;
  54 }
  55
  56 STDMETHODIMP CShellExtClassFactory::CreateInstance(LPUNKNOWN pUnkOuter,
  57                                                                                                    REFIID riid,
  58                                                                                                    LPVOID *ppvObj)
  59 {
  60     *ppvObj = NULL;
  61
  62     // Shell extensions typically don't support aggregation (inheritance)
  63
  64     if (pUnkOuter)
  65         return CLASS_E_NOAGGREGATION;
  66
  67     // Create the main shell extension object.  The shell will then call
  68     // QueryInterface with IID_IShellExtInit--this is how shell extensions are
  69     // initialized.
  70
  71     CShellExt* pShellExt = new CShellExt(m_StateToMake);  //Create the CShellExt object
  72
  73     if (NULL == pShellExt)
  74         return E_OUTOFMEMORY;
  75
  76     return pShellExt->QueryInterface(riid, ppvObj);
  77 }
  78
  79
  80 STDMETHODIMP CShellExtClassFactory::LockServer(BOOL /*fLock*/)
  81 {
  82     return E_NOTIMPL;
  83 }