关于图象显示的问题

void CDSplitView::OnDraw(CDC* pDC)

{

	CDSplitDoc* pDoc = GetDocument();

	ASSERT_VALID(pDoc);

	if (!pDoc)

		return;

        if (!state)

                return;



	// TODO: add draw code for native data here

	if( strFilename != "" )

	{

		BITMAP bmpProperties;



		// Create a bitmap handle using the name of the file

		HBITMAP bmpHandle = (HBITMAP)LoadImage(NULL,

			                               strFilename,

					               IMAGE_BITMAP,

					               0,

						       0,

						       LR_LOADFROMFILE);



		CBitmap bmpPicture;

		CDC mdcPicture;



	// Convert the Win32 bitmap handle into an MFC bitmap object

		CBitmap *bmpFromHandle = bmpPicture.FromHandle(bmpHandle);

		bmpPicture.Attach(bmpHandle);



	// Call the Win32 GetObject() function to get the properties

		// of the bitmap and store them in a BITMAP structure

		::GetObject(bmpPicture,

			    sizeof(bmpProperties),

			    &bmpProperties);



		// Create a compatible device context

		mdcPicture.CreateCompatibleDC(pDC);

		// Select the bitmap into the device context

		CBitmap * bmpPrevious = 

				mdcPicture.SelectObject(bmpFromHandle);



		// Using the dimensions store in the BITMAP object,

		// display the picture

		pDC->BitBlt(0, 0,

			    bmpProperties.bmWidth, bmpProperties.bmHeight,

			    &mdcPicture, 0, 0, SRCCOPY);



		// Get the dimensions of the new picture

		SIZE sizeTotal;

		sizeTotal.cx = bmpProperties.bmWidth;

		sizeTotal.cy = bmpProperties.bmHeight;

		// Change the scrolling area/dimensions of the view

		SetScrollSizes(MM_TEXT, sizeTotal);



		// Restore the bitmap

		pDC->SelectObject(bmpPrevious);

		// Delete the Win32 bitmap handle

		DeleteObject(bmpHandle);

	}

}