C / C++ / MFC

class CSingleton
{
public:
  static CSingleton * getInstance() {
    if (!_singleton) _singleton = new CSingleton;
    return _singleton;
  }

protected:
  CSingleton() { }
  ~CSingleton() { }

private:
  static CSingleton *  _singleton;
};

CSingleton* CSingleton ::_singleton = NULL;

template < typename T >
class CSingleton
{
public:
  static CSingleton * getInstance() {
    if (!_singleton) _singleton = new CSingleton;
    return _singleton;
  }

  // Access to the pointer, but NOT the singleton itself
  const T* operator->() { return m_ptr; };  

protected:
  CSingleton() { m_ptr = new T; }
  ~CSingleton() { if (m_ptr) delete m_ptr; }

private:
  static CSingleton *  _singleton;
  T * m_ptr;
};

LPCTSTR imgpathname = ...;

CImage img;
img.Load(imgpathname);

CClientDC dc(this);
img.Draw(dc, 0, 0);

Mark Salsbery
Microsoft MVP - Visual C++

CImageDlg::CImageDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CImageDlg::IDD, pParent)
{
	m_StrTitle = _T("Image for ");
	m_hBmp = NULL; /*HBITMAP*/
}

CImageDlg::~CImageDlg()
{
}

void CImageDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
}


BEGIN_MESSAGE_MAP(CImageDlg, CDialog)
	ON_WM_PAINT()
END_MESSAGE_MAP()


// CImageDlg message handlers


void CImageDlg::OnPaint()
{
	CPaintDC dc(this); // device context for painting
	RECT rect = {0};
	GetClientRect(&rect);
	if (m_hBmp != NULL)
	{
		....
		BitBlt(dc.GetSafeHdc(), 0, 0, 100, 100, memDC, 0,0, SRCCOPY);
	}
}

void CImageDlg::SetTitle(CString str)
{
	m_StrTitle += str;
}

void CImageDlg::SetBitmap(HBITMAP hBmp)
{
	m_hBmp = hBmp;
}

BOOL CImageDlg::OnInitDialog()
{
	CDialog::OnInitDialog();

	SetWindowText(m_StrTitle);
	
	if (m_hBmp == NULL)
	{
		TCHAR szFile[260] = {0};
		OPENFILENAME openfilename = {0};
		wchar_t wcsMyPicturesPath[1024] = {0};
		SHGetFolderPath( NULL, CSIDL_MYPICTURES, NULL, 0, wcsMyPicturesPath );
		ZeroMemory(&openfilename, sizeof(openfilename));
		openfilename.lStructSize = sizeof(OPENFILENAME);
		openfilename.hwndOwner = this->m_hWnd;
		openfilename.lpstrFile = szFile;
		openfilename.lpstrFile[0] = _T('\0');
		openfilename.nMaxFile = sizeof(szFile);
		
		TCHAR szFltr[200] = {0};
		lstrcat(szFltr, _T("*.JPG;*.JPEG;*.BMP;*.PNG;\0"));
		openfilename.lpstrFilter =  szFltr;

		openfilename.nFilterIndex = 0;
		openfilename.lpstrFileTitle = NULL;
		openfilename.nMaxFileTitle =   0;
		openfilename.lpstrInitialDir = wcsMyPicturesPath;
		openfilename.lpstrTitle = NULL;
		openfilename.Flags = OFN_FILEMUSTEXIST|OFN_PATHMUSTEXIST;
		
		if(GetOpenFileName(&openfilename) == TRUE) 
		{	
			using namespace Gdiplus;
						
			Gdiplus::Image *img = Image::FromFile(openfilename.lpstrFile);
			Gdiplus::Image *thumbImg = img->GetThumbnailImage(100, 100);
			m_hBmp = (HBITMAP)thumbImg;
		}
		else
		{
			return -1;
		}
	}
	return TRUE;  // return TRUE unless you set the focus to a control
	// EXCEPTION: OCX Property Pages should return FALSE
}

void CImageDlg::OnPaint()
{
	CPaintDC dc(this); // device context for painting
	RECT rect = {0};
	GetClientRect(&rect);
	if (m_hBmp != NULL)
	{
		CDC memDC;
		MemDC.CreateCompatibleDC(&dc);
		HBITMAP OrigBmp = ::SelectObject(memDC, m_hBmp);
		BITMAP BInfo;
		::GetObject(m_hBmp, sizeof(BInfo), &BInfo);
		::BitBlt(dc.GetSafeHdc(), 0, 0, BInfo.bmWidth, BInfo.bmHeight, memDC, 0,0, SRCCOPY);
		::SelectObject(memDC, OrigBmp);
	}
}

Anjali Patil wrote:

i want to divide status bar control panes into 3 equal parts,how can i do this?

You need to google first, if you have "It's urgent please" mentioned in your question.
_AnShUmAn_

Greg Ellis wrote:

Next, I had to find a way to customize the existing scrollbars or else make my own. So, I tried to subclass the CScrollbar class; whenever I tried to use the GetScollbarCtrl() function from the CListCtrl, it returned null. Obviously, the scrollbars are not real. Unfortunately, this means I had to hide the existing scrollbars and create my own (a lot more work than just skinning the existing ones).

I began to try to hide the scrollbars of the CListCtrl and then somehow create my own. I found a solution for hiding the scrollbars in a CListCtrl on the CodeGuru message boards from Filbert Fox. This worked great, so my next task was to create my own scrollbars.

I chose to derive a class from CStatic and create the scrollbar from scratch using bitmaps. It took a while and a lot of tweaking, but I got the custom scrollbar created and working including the wheel mouse, arrow keys, and pageup/pagedown keys.