summaryrefslogtreecommitdiffstats
path: root/vcl/win/dtrans/DTransHelper.hxx
diff options
context:
space:
mode:
Diffstat (limited to 'vcl/win/dtrans/DTransHelper.hxx')
-rw-r--r--vcl/win/dtrans/DTransHelper.hxx167
1 files changed, 167 insertions, 0 deletions
diff --git a/vcl/win/dtrans/DTransHelper.hxx b/vcl/win/dtrans/DTransHelper.hxx
new file mode 100644
index 000000000..d8ab3349c
--- /dev/null
+++ b/vcl/win/dtrans/DTransHelper.hxx
@@ -0,0 +1,167 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed
+ * with this work for additional information regarding copyright
+ * ownership. The ASF licenses this file to you under the Apache
+ * License, Version 2.0 (the "License"); you may not use this file
+ * except in compliance with the License. You may obtain a copy of
+ * the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#pragma once
+
+#if !defined WIN32_LEAN_AND_MEAN
+# define WIN32_LEAN_AND_MEAN
+#endif
+#include <windows.h>
+#include <objidl.h>
+#include "WinClip.hxx"
+
+#define AUTO_INIT true
+
+// a helper class to manage a global memory area, the clients can write
+// into the global memory area and extract the handle to the global mem
+// note: not thread-safe
+
+class CStgTransferHelper
+{
+public:
+ // will be thrown in case of failures
+ class CStgTransferException
+ {
+ public:
+ HRESULT m_hr;
+ explicit CStgTransferException( HRESULT hr ) : m_hr( hr ) {};
+ };
+
+public:
+ CStgTransferHelper(
+ bool bAutoInit = false,
+ HGLOBAL hGlob = nullptr,
+ bool bDelStgOnRelease = false );
+
+ ~CStgTransferHelper( );
+
+ void write( const void* lpData, ULONG cb, ULONG* cbWritten = nullptr );
+ void read( LPVOID pv, ULONG cb, ULONG* pcbRead = nullptr );
+
+ HGLOBAL getHGlobal( ) const;
+ void getIStream( LPSTREAM* ppStream );
+
+ void init(
+ SIZE_T newSize,
+ sal_uInt32 uiFlags = GHND,
+ bool bDelStgOnRelease = false );
+
+ void init(
+ HGLOBAL hGlob,
+ bool bDelStgOnRelease = false );
+
+ // returns the size of the managed memory
+ sal_uInt32 memSize( CLIPFORMAT cf = CF_INVALID ) const;
+
+ // free the global memory and necessary
+ // release the internal stream pointer
+ void cleanup( );
+
+private:
+ LPSTREAM m_lpStream;
+ bool m_bDelStgOnRelease;
+
+private:
+ CStgTransferHelper( const CStgTransferHelper& );
+ CStgTransferHelper& operator=( const CStgTransferHelper& );
+};
+
+// something like an auto-pointer - allows access to the memory belonging
+// to a HGLOBAL and automatically unlocks a global memory at destruction
+// time
+
+class CRawHGlobalPtr
+{
+public:
+
+ // ctor
+
+ explicit CRawHGlobalPtr( HGLOBAL hGlob ) :
+ m_hGlob( hGlob ),
+ m_bIsLocked( false ),
+ m_pGlobMem( nullptr )
+ {
+ }
+
+ // ctor
+
+ explicit CRawHGlobalPtr( const CStgTransferHelper& theHGlobalHelper ) :
+ m_hGlob( theHGlobalHelper.getHGlobal( ) ),
+ m_bIsLocked( false ),
+ m_pGlobMem( nullptr )
+ {
+ }
+
+ // dtor
+
+ ~CRawHGlobalPtr( )
+ {
+ if ( m_bIsLocked )
+ GlobalUnlock( m_hGlob );
+ }
+
+ // lock the global memory (initializes a
+ // pointer to this memory)
+
+ BOOL Lock( )
+ {
+ if ( !m_bIsLocked && ( nullptr != m_hGlob ) )
+ {
+ m_pGlobMem = GlobalLock( m_hGlob );
+ m_bIsLocked = ( nullptr != m_pGlobMem );
+ }
+
+ return m_bIsLocked;
+ }
+
+ // unlock the global memory (invalidates the
+ // pointer to this memory)
+
+ BOOL Unlock( )
+ {
+ GlobalUnlock( m_hGlob );
+ m_bIsLocked = false;
+ m_pGlobMem = nullptr;
+
+ return ( NO_ERROR == GetLastError( ) );
+ }
+
+ // locks the global memory and returns a
+ // pointer to this memory
+
+ LPVOID GetMemPtr( )
+ {
+ Lock( );
+ return m_pGlobMem;
+ }
+
+ // size of mem we point to
+
+ int MemSize( ) const
+ {
+ return GlobalSize( m_hGlob );
+ }
+
+private:
+ HGLOBAL m_hGlob;
+ bool m_bIsLocked;
+ LPVOID m_pGlobMem;
+};
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */