C++ Bitmap::GetHICON方法代码示例

STDMETHODIMP CTaskbar7::SetTabsIcon(BSTR icon)
{
	// Remove icon if icon path is empty
	if (CComBSTR(icon) == CComBSTR(""))
	{
		if (m_isWindows7)
			SetClassLong(m_hwnd, GCL_HICON, NULL);

		return S_OK;
	}

	USES_CONVERSION;
	Bitmap* bitmap = NULL;
	HRESULT hr = LoadImageFromFile(OLE2W(icon), &bitmap);

	// return a proper error
	if (!SUCCEEDED(hr))
		return hr;

	// Do nothing on XP & Vista
	if (!m_isWindows7) {
		delete bitmap;
		return S_OK;
	}

	HICON hIcon;
	bitmap->GetHICON(&hIcon);
	SetClassLong(m_hwnd, GCL_HICON, (LONG)hIcon);

	// Cleanup the HICON & Bitmap
	DestroyIcon(hIcon);
	delete bitmap;

	return S_OK;
}

// 读取图标(从内存中加载)
BOOL LoadIconFromMem(BYTE* pByte, DWORD dwSize, HICON &hIcon)
{
	// 根据文件大小分配HGLOBAL内存
	HGLOBAL hGlobal = GlobalAlloc( GMEM_MOVEABLE | GMEM_NODISCARD, dwSize );
	if ( !hGlobal )
	{
		TRACE( _T( "Load (file): Error allocating memory\n" ) );
		return FALSE;
	};

	char *pData = reinterpret_cast<char*>(GlobalLock(hGlobal));
	if ( !pData )
	{
		TRACE( _T( "Load (file): Error locking memory\n" ) );
		GlobalFree( hGlobal );
		return FALSE;
	};

	// 将文件内容读到HGLOBAL内存中
	memcpy(pData, pByte, dwSize);
	GlobalUnlock( hGlobal );

	// 利用hGlobal内存中的数据创建stream
	IStream *pStream = NULL;
	if ( CreateStreamOnHGlobal( hGlobal, TRUE, &pStream ) != S_OK )
	{
		return FALSE;
	}

	Bitmap* pBitmap = Gdiplus::Bitmap::FromStream(pStream);

	// 要加上这一句，否则由GlobalAlloc得来的hGlobal内存没有被释放，导致内存泄露，由于
	// CreateStreamOnHGlobal第二个参数被设置为TRUE，所以调用pStream->Release()会自动
	// 将hGlobal内存（参见msdn对CreateStreamOnHGlobal的说明）
	pStream->Release();

	HBITMAP hBitmap = NULL;
	Status status = pBitmap->GetLastStatus();
	if(Ok == status)
	{
		status = pBitmap->GetHICON(&hIcon);
		delete pBitmap;

		if(Ok == status)
		{
			return TRUE;
		}
	}

	return FALSE;
}

/*************************************
* Overlay
*************************************/
STDMETHODIMP CTaskbar7::SetOverlayIcon(BSTR path, BSTR description)
{
	if (!m_pTaskbarList || m_parentHwnd == NULL)
		return S_OK;

	USES_CONVERSION;
	wstring image(OLE2W(path));
	wstring desc(OLE2W(description));

	// if no path is given, we remove the overlay
	if (image.empty())
	{
		if (m_isWindows7)
			return m_pTaskbarList->SetOverlayIcon(m_parentHwnd, NULL, L"");

		return S_OK;
	}

	Bitmap* bitmap = NULL;
	HRESULT hr = LoadImageFromFile(image, &bitmap);

	if (!SUCCEEDED(hr))
		return hr;

	// Do nothing on XP & Vista
	if (!m_isWindows7)
	{
		delete bitmap;
		return S_OK;
	}

	HICON pIcon;
	bitmap->GetHICON(&pIcon);

	// Sets the overlay icon
	hr = m_pTaskbarList->SetOverlayIcon(m_parentHwnd, pIcon, desc.c_str());

	DestroyIcon(pIcon);
	delete bitmap;

	return hr;
}

//----------------------------------------------------------------------------------------------------------------------
//  DO IMAGE LIST
//----------------------------------------------------------------------------------------------------------------------
void cListView :: do_image_list ( const cFigViewItemList * pList )
{
	mojo::cPtI IconSize = get_icon_size ();
	int iDimX = IconSize.x;
	int iDimY = IconSize.y;

	HIMAGELIST hIL = ImageList_Create ( iDimX, iDimY, LR_CREATEDIBSECTION | ILC_COLOR32, pList->qty(), 1 );

	//------------------------------------------
	//  LOAD DEFAULT IMAGES
	//------------------------------------------

	const int * aiBitmap = default_bitmap_ids ();

	for ( int i = 0; aiBitmap[i]; i++ )
	{
		HANDLE hBitmap = LoadImage ( g_hInstance, MAKEINTRESOURCE ( aiBitmap[i] ), IMAGE_BITMAP, 0, 0, LR_CREATEDIBSECTION );
		ImageList_Add ( hIL, (HBITMAP) hBitmap, NULL );
	}

	int iItemIndex = 0;
	for ( cFigViewItem * p = pList->pHead; p; p = p->pNext, iItemIndex++ )
	{
		bool bLoadedFromFile = false;
		int iImageIndex = 0;

		//-------------------------------
		// TRY TO LOAD IMAGE FROM FILE
		//-------------------------------

		if ( p->sIconPath.len() )
		{
			if ( ! file_exists ( p->sIconPath.cstr() ) )
			{
				mojo::put_ad_lib_memo ( mojo::cMemo::error, L"Image file not found", L"%s", p->sIconPath.cstr() );
				cStrW s;
				s.f ( L"Image file not found: %s", p->sIconPath.cstr() );
				LOG ( s.cstr() );
			}

			else
			{
				HICON hIcon;
				Bitmap bm ( p->sIconPath.cstr() );
				if ( ! ( Ok == bm.GetLastStatus() ) )
					LOG_V ( L"Bitmap constructor failed with %s.", p->sIconPath.cstr() );

				else
				{
					bm.GetHICON(&hIcon);
					if ( Ok !=  bm.GetLastStatus() )
						LOG_V ( L"Bitmap::GetHICON() failed with %s", p->sIconPath.cstr() );

					else
					{
						iImageIndex = ImageList_AddIcon( hIL, hIcon );
						bLoadedFromFile = true;
					}
				}

				if ( ! bLoadedFromFile)
					mojo::put_ad_lib_memo ( mojo::cMemo::error, L"Unable to display image file", L"%s", p->sIconPath.cstr() );
			}
		}

		if ( ! bLoadedFromFile )
		{
			iImageIndex = 0;;
		}
#if 0

		LVITEM lvi;
		ZeroMemory ( &lvi, sizeof(lvi) );
		lvi.mask = LVIF_IMAGE;
		lvi.iItem = iItemIndex;
		lvi.iImage = iImageIndex;
		ListView_SetItem ( hwnd, &lvi );
#endif
	}

	HIMAGELIST hResult = ListView_SetImageList ( hwnd, hIL, LVSIL_NORMAL ); 
	hResult;
}