shared source/wpf/src/host/shimimpl/activationcontext.hxx

   1 #pragma once
   2
   3 // Wrapper for a Fusion Activation Context (ACTCTX)
   4 class ActivationContext
   5 {
   6     ActivationContext(const ActivationContext&);
   7     void operator =(const ActivationContext&);
   8 public:
   9     ActivationContext() :
  10         m_hActCtx(INVALID_HANDLE_VALUE),
  11         m_actCtxCookie(0),
  12         m_fAutoDeactivate(true)
  13     {
  14     }
  15
  16     ~ActivationContext()
  17     {
  18         if(m_hActCtx != INVALID_HANDLE_VALUE)
  19         {
  20             // If we don't deactivate the context, we can't release it either.
  21             if(m_fAutoDeactivate)
  22             {
  23                 DeActivate();
  24                 ReleaseActCtx(m_hActCtx);
  25             }
  26         }
  27     }
  28
  29     bool Create(LPCWSTR manifestModulePath)
  30     {
  31         if (m_hActCtx != INVALID_HANDLE_VALUE || !manifestModulePath || !*manifestModulePath)
  32         {
  33             ASSERT(false);
  34             return false;
  35         }
  36
  37         ACTCTXW actctx = { sizeof(actctx) };
  38         actctx.lpSource = manifestModulePath;
  39         actctx.lpResourceName = MAKEINTRESOURCEW(2);
  40         actctx.dwFlags = ACTCTX_FLAG_RESOURCE_NAME_VALID;
  41
  42         m_hActCtx = CreateActCtxW(&actctx);
  43         return m_hActCtx != INVALID_HANDLE_VALUE;
  44     }
  45
  46     bool Activate(bool autoDeactivate = true)
  47     {
  48         if(m_hActCtx == INVALID_HANDLE_VALUE)
  49         {
  50             ASSERT(false);
  51             return false;
  52         }
  53         m_fAutoDeactivate = autoDeactivate;
  54         return ActivateActCtx(m_hActCtx, &m_actCtxCookie) != false;
  55     }
  56
  57     bool DeActivate()
  58     {
  59         if(m_hActCtx == INVALID_HANDLE_VALUE || m_actCtxCookie == 0)
  60         {
  61             ASSERT(false);
  62             return false;
  63         }
  64         ULONG_PTR cookie = m_actCtxCookie;
  65         m_actCtxCookie = 0;
  66         return DeactivateActCtx( 0, cookie) != false;
  67     }
  68
  69 private:
  70     HANDLE m_hActCtx;
  71     ULONG_PTR m_actCtxCookie;
  72     bool m_fAutoDeactivate;
  73 };