C / C++ / MFC

panthal wrote:

if you know please tell me

#include "AtlImage.h"

CImage m_Image;
m_Image.Load("c:\\123.jpg");

BOOL CdddDlg::OnEraseBkgnd(CDC* pDC)
{

ppp.BitBlt(pDC->m_hDC,0,0);
return TRUE;
}

CImage m_Image;
m_Image.Load("c:\\1234.jpg");
m_Static.SetBitmap(m_Image.Detach());

xelontr wrote:

Where should i start?

   CDC m_dc,m_dc2;

   m_dc.CreateCompatibleDC(GetDC());
   m_dc2.CreateCompatibleDC(GetDC());

   HBITMAP hbit=CreateCompatibleBitmap(GetDC()->m_hDC,800,600);
   HBITMAP hbit2=CreateCompatibleBitmap(GetDC()->m_hDC,800,600);
   hbit=(HBITMAP)m_dc.SelectObject(hbit);
   hbit2=(HBITMAP)m_dc2.SelectObject(hbit2);

   hbit=(HBITMAP)LoadImage(NULL, _T("c:\\1234.bmp"), IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE);
   hbit=(HBITMAP)m_dc.SelectObject(hbit);
   m_dc.TextOut(0,0,_T("And is this your answer"),23);

m_dc2.BitBlt(300,300,200,200,&m_dc,0,0,SRCCOPY);
   hbit2=(HBITMAP)m_dc2.SelectObject(hbit);

   CImage m_Image;
   m_Image.Attach(hbit2);
   m_Image.Save(_T("e:\\test.bmp"));
   m_Image.Destroy();
   m_dc.DeleteDC();
   m_dc2.DeleteDC();
   DeleteObject(hbit);
   DeleteObject(hbit2);

    CDC m_dc,m_dc2;
    
    m_dc.CreateCompatibleDC(GetDC());
    m_dc2.CreateCompatibleDC(GetDC());

    HBITMAP hbit=CreateCompatibleBitmap(GetDC()->m_hDC,800,600);
    HBITMAP hbit2=CreateCompatibleBitmap(GetDC()->m_hDC,800,600);
    hbit=(HBITMAP)m_dc.SelectObject(hbit);
    <font color="Red">// hbit is m_dc's original bitmap
    // m_dc has compatible bitmap 1</font>
    hbit2=(HBITMAP)m_dc2.SelectObject(hbit2);
    <font color="Red">// hbit2 is m_dc2's original bitmap
    // m_dc2 has compatible bitmap 2</font>

    hbit=(HBITMAP)LoadImage(NULL, _T("e:\\8bit.bmp"), IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE);
    <font color="Red">// hbit is loaded bitmap (m_dc's original bitmap is lost)</font>
    hbit=(HBITMAP)m_dc.SelectObject(hbit);
    <font color="Red">// hbit is compatible bitmap 1
    // m_dc has loaded bitmap</font>
    m_dc.TextOut(0,0,_T("And is this your answer"),23);

    m_dc2.BitBlt(300,300,200,200,&m_dc,0,0,SRCCOPY);
    hbit2=(HBITMAP)m_dc2.SelectObject(hbit);
    <font color="Red">// hbit2 is compatible bitmap 2 (m_dc2's original bitmap is lost)
    // m_dc2 has compatible bitmap 1</font>

    CImage m_Image;
    m_Image.Attach(hbit2);
    m_Image.Save(_T("e:\\8bit_test.bmp"));
    m_Image.Destroy();
    <font color="Red">// compatible bitmap 2 destroyed</font>
    m_dc.DeleteDC();
    m_dc2.DeleteDC();
    DeleteObject(hbit);
    <font color="Red">// compatible bitmap 1 destroyed</font>
    DeleteObject(hbit2);
    <font color="Red">// hbit2 was already destroyed above so this line was useless</font>

    <font color="Red">// loaded bitmap is lost - leak</font>

Mark Salsbery
Microsoft MVP - Visual C++