implement wxHAVE_RAW_BITMAP

[wxWidgets.git] / include / wx / msw / private.h

diff --git a/include/wx/msw/private.h b/include/wx/msw/private.h
index 9d639f1fb81942b0515da3e778ba690f82d04f80..7f26ece1cb627dd44eb12289be577c3574cb19c1 100644 (file)
--- a/include/wx/msw/private.h
+++ b/include/wx/msw/private.h
@@ -362,13 +362,13 @@ private:
     DECLARE_NO_COPY_CLASS(ScreenHDC)
 };
 
-// the same as ScreenHDC but for memory DCs: creates the HDC in ctor and
-// destroys it in dtor
+// the same as ScreenHDC but for memory DCs: creates the HDC compatible with
+// the given one (screen by default) in ctor and destroys it in dtor
 class MemoryHDC
 {
 public:
-    MemoryHDC() { m_hdc = ::CreateCompatibleDC(NULL); }
-   ~MemoryHDC() { ::DeleteDC(m_hdc);                  }
+    MemoryHDC(HDC hdc = 0) { m_hdc = ::CreateCompatibleDC(hdc); }
+   ~MemoryHDC() { ::DeleteDC(m_hdc); }
 
     operator HDC() const { return m_hdc; }
 
@@ -395,7 +395,46 @@ private:
    HDC m_hdc;
    HGDIOBJ m_hgdiobj;
 
-    DECLARE_NO_COPY_CLASS(SelectInHDC)
+   DECLARE_NO_COPY_CLASS(SelectInHDC)
+};
+
+// when working with global pointers (which is unfortunately still necessary
+// sometimes, e.g. for clipboard) it is important to unlock them exactly as
+// many times as we lock them which just asks for using a "smart lock" class
+class GlobalPtr
+{
+public:
+    GlobalPtr(HGLOBAL hGlobal) : m_hGlobal(hGlobal)
+    {
+        m_ptr = ::GlobalLock(hGlobal);
+        if ( !m_ptr )
+        {
+            wxLogLastError(_T("GlobalLock"));
+        }
+    }
+
+    ~GlobalPtr()
+    {
+        if ( !::GlobalUnlock(m_hGlobal) )
+        {
+#ifdef __WXDEBUG__
+            // this might happen simply because the block became unlocked
+            DWORD dwLastError = ::GetLastError();
+            if ( dwLastError != NO_ERROR )
+            {
+                wxLogApiError(_T("GlobalUnlock"), dwLastError);
+            }
+#endif // __WXDEBUG__
+        }
+    }
+
+    operator void *() const { return m_ptr; }
+
+private:
+    HGLOBAL m_hGlobal;
+    void *m_ptr;
+
+    DECLARE_NO_COPY_CLASS(GlobalPtr)
 };
 
 // ---------------------------------------------------------------------------