Click here to Skip to main content
Click here to Skip to main content
Go to top

Streaming IPicture to Compound Document file

, 28 Oct 2001
Rate this:
Please Sign up or sign in to vote.
Serialization of IPicture object
<!-- Download Links --> <!-- Article image -->

Sample Image - PictureStream.jpg

<!-- Add the rest of your HTML here -->

Introduction

I really like the IPicture object. This COM object works very well. However, I met some problems when I was trying to use this object in the Document-View architecture. The main problem is implementation of serialization. I built two classes to resolve those problems. The first class called CPictureObj. This class is responsible for drawing picture. The second one is collection of picture objects. By using both of them it is easy to implement the following functionality:

  • Load one or more images into document (*.bmp, *.jpeg, *.ico,...)
  • Scaling images (Zoom In, Zoom Out)
  • Move images by cursor
  • Alignment
  • Save/Load images to/from compound document file.

Classes

class <code>CPictureObj  :	public CPictureHolder, public CObject
{
	DECLARE_SERIAL(CPictureObj);
public:
	CPictureObj();
	CPictureObj(const CRect position);
	virtual  ~CPictureObj();
	void RemoveAndDestroy();

	virtual  void Copy( CPictureObj &right);
	virtual  HRESULT WriteToStream(IStream* pStream);
	virtual  HRESULT ReadFromStream(IStream* pStream);
	
// Attributes
public:
	HorzAlign	GetHorzAlign( void ) const;
	void		SetHorzAlign( HorzAlign eHorzAlign );
	VertAlign	GetVertAlign( void ) const;
	void		SetVertAlign( VertAlign eVertAlign );
	BOOL		GetSelected( void ) const;
	void		SetSelected( BOOL bValue );
	void		SetVisible(BOOL bValue);
	BOOL		GetVisible();
	CRect		GetPosition();
	void		SetPosition(const CRect pos);
	CRect		GetStartRect();
	void		SetStartRect(const CRect pos);
	CString		GetPathName();
	void		SetPathName(const CString pathname);

	OLE_HANDLE	GetHandle();
	CSize		GetSize();			// in himetric
	CSize		GetSize(CDC*pDC);	// in pixel
	CSize		GetSize(CWnd*pWnd);	// in pixel
	BOOL		IsValidPicture();

// Operations
public:

	BOOL Load(LPCTSTR szFile);
	BOOL CreateFromFile(const CPoint pt);
	void ReleasePicture();
	void MoveTo(const CRect& position, CWnd* pView);

	// Drawing picture
	void Draw(CDC* pDC);
	void Draw(CDC* pDC, CRect& rcBounds);
	void Draw(CDC* pDC, const CRect& rcPosition, const CRect& rcBounds);
	void DrawTracker(CDC* pDC);
	void DrawTracker(CDC* pDC, const CRect& rect);
	void ZoomIn();
	void ZoomOut();

protected:

	void CalcZoom();
	void SetZoomToPosition();

protected:

	HorzAlign	m_eHorizAlign;
	VertAlign	m_eVertAlign;
	BOOL		m_bSelected;
	BOOL		m_bVisible;
	CRect		m_rcPosition;		// in pixels
	CRect		m_startRect;		// in pixels
	int		m_trackerStyle;
	int		m_zoomX,m_zoomY;

	// Not serialized
	CString		m_strPathName;

};

class  CPictureObjList : public CTypedPtrList {CObList, CPictureObj*}
{
public :
	~CPictureObjList();

	void RemoveAndDestroy();
	void DeselectAll();
	
	CSize ComputeMaxSize();			// in himetric
	CSize ComputeMaxSize(CDC* pDC);		// in pixel
	CSize ComputeMaxSize(CWnd* pWnd);	// in pixel
	CRect GetRect();			// in pixel

	CPictureObj* FindSelected();
	CPictureObj* ObjectAt(const CPoint& pt);
	bool Remove(CPictureObj* pObj);
	void Draw(CDC* pDC);

	// Streaming
	HRESULT WriteToStream(IStream* pStream);
	HRESULT ReadFromStream(IStream* pStream);
	BOOL	WriteToStorage(LPSTORAGE lpRootStg);
	BOOL	ReadFromStorage(LPSTORAGE lpRootStg);

};

Using the classes

For use streaming picture create your document object derived from COleDocument.

class CYourDoc : public COleDocument

Inside of the document object define a picture collection like here:

CPictureObjList	m_objects;

Now, you can insert picture by this simple method:

CPictureObj* pObj =  new CPictureObj;
pObj->CreateFromFile(CPoint(10,10));
m_objects.AddHead(pObj);

Also, you can load picture directly from the file:

CPictureObj* pObj =  new CPictureObj;
pObj->Load("MyFile.jpg");
m_objects.AddHead(pObj);

For scaling pictures you can use the ZoomIn, ZoomOut member functions:

CPictureObj* pObj = m_objects.FindSelected();
if(pObj)
{
    pObj->ZoomIn();
}

Moving the selected picture is easy:

   CPoint delta = point - c_last;
   CPictureObj* pSel = m_objects.FindSelected();
   if(pSel)
   {
	CRect position = pSel->GetPosition();
	position += delta;
	pSel->MoveTo(position, this);
   }

Drawing a collection of pictures is also easy:

GetDocument()->m_objects.Draw(pDC);

Implementation of picture serialization you can get from here:

void CYourDoc::Serialize(CArchive& ar)
{
	CWaitCursor wait;
	COleDocument::Serialize(ar);
	if (ar.IsStoring())
	{
		m_objects.WriteToStorage(m_lpRootStg); 
	}
	else
	{
		m_objects.ReadFromStorage(m_lpRootStg); 
		m_objects.DeselectAll();
	}
}

Good luck!

License

This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

A list of licenses authors might use can be found here

Share

About the Author

Eugene Khodakovsky
Software Developer (Senior)
United States United States
No Biography provided

Comments and Discussions

 
GeneralPrint Preview save as jpg Pinmembernaraimha23-Apr-07 19:20 
QuestionStoring a resource bitmap using IPicture PinmemberD. L. Sleeman10-Jan-07 20:51 
GeneralRotating an Image using IPicture PinmemberAlex Evans3-Jan-05 16:32 
GeneralSave As a File such as bmp,jpg,ico... Pinmemberyuanque24-Jul-03 15:25 
GeneralHandle To Bitamp from IPicture PinmemberProjectX25-Apr-02 0:27 
GeneralRe: Handle To Bitamp from IPicture PinmemberEugeneK25-Apr-02 2:31 
GeneralRe: Handle To Bitamp from IPicture PinmemberProjectX28-Apr-02 21:12 
Hi,
Thanks for the help. Smile | :) But my problem is different Frown | :( I am getting the IPicture* from a OLE document in which a bitmap is stored as a thumbnail (Preview).
So I get the IPicture* directly. Hence i can not use the method Load() as i am not reading a Bitmap, JPEG file directly. I just have IPicture*. Thru this i need to have the handle to bitmap.
 
There is a method get_Handle(). I tried that but it did not help as i am not sure whether it returns the HBITMAP (probably it does not!).
 
Can you please help.
 
Can you instantiate CPictureObj directory from the IPicture* ? modifying the ctor ?
 

Thanks once again.
 


GeneralRe: Handle To Bitamp from IPicture PinmemberAlex Hazanov10-Dec-02 4:45 
GeneralRe: Handle To Bitamp from IPicture Pinmembernetecho17-Mar-05 0:25 
Generaljpeg in memory dc PinmemberAnonymous16-Feb-02 3:09 
GeneralRe: jpeg in memory dc Pinmemberswinefeaster11-May-02 17:06 

General General    News News    Suggestion Suggestion    Question Question    Bug Bug    Answer Answer    Joke Joke    Rant Rant    Admin Admin   

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.

| Advertise | Privacy | Mobile
Web02 | 2.8.140916.1 | Last Updated 29 Oct 2001
Article Copyright 2001 by Eugene Khodakovsky
Everything else Copyright © CodeProject, 1999-2014
Terms of Service
Layout: fixed | fluid