在dialog上显示bitmap

// ex_23Dlg.cpp : implementation file
//

#include "stdafx.h"
#include "ex_23.h"
#include "ex_23Dlg.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CEx_23Dlg dialog

CEx_23Dlg::CEx_23Dlg(CWnd* pParent /*=NULL*/)
    : CDialog(CEx_23Dlg::IDD, pParent)
{
    //{{AFX_DATA_INIT(CEx_23Dlg)
        // NOTE: the ClassWizard will add member initialization here
    //}}AFX_DATA_INIT
    // Note that LoadIcon does not require a subsequent DestroyIcon in Win32
    m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CEx_23Dlg::DoDataExchange(CDataExchange* pDX)
{
    CDialog::DoDataExchange(pDX);
    //{{AFX_DATA_MAP(CEx_23Dlg)
        // NOTE: the ClassWizard will add DDX and DDV calls here
    //}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CEx_23Dlg, CDialog)
    //{{AFX_MSG_MAP(CEx_23Dlg)
    ON_WM_PAINT()
    ON_WM_QUERYDRAGICON()
    //}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CEx_23Dlg message handlers

BOOL CEx_23Dlg::OnInitDialog()
{
    CDialog::OnInitDialog();

    // Set the icon for this dialog.  The framework does this automatically
    //  when the application's main window is not a dialog
    SetIcon(m_hIcon, TRUE);            // Set big icon
    SetIcon(m_hIcon, FALSE);        // Set small icon
    
    // TODO: Add extra initialization here
    
    return TRUE;  // return TRUE  unless you set the focus to a control
}

// If you add a minimize button to your dialog, you will need the code below
//  to draw the icon.  For MFC applications using the document/view model,
//  this is automatically done for you by the framework.

void CEx_23Dlg::OnPaint() 
{
    if (IsIconic())
    {
        CPaintDC dc(this); // device context for painting

        SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);

        // Center icon in client rectangle
        int cxIcon = GetSystemMetrics(SM_CXICON);
        int cyIcon = GetSystemMetrics(SM_CYICON);
        CRect rect;
        GetClientRect(&rect);
        int x = (rect.Width() - cxIcon + 1) / 2;
        int y = (rect.Height() - cyIcon + 1) / 2;

        // Draw the icon
        dc.DrawIcon(x, y, m_hIcon);

    }
    else
    {
////////////////////////////////////////////////////////画bitmap上去
        CPaintDC dc(this);
        CBitmap BackBMP;
        BackBMP.LoadBitmap(IDB_BITMAP1);
        BITMAP bm;
        BackBMP.GetBitmap(&bm);
        CDC ImageDC;
        ImageDC.CreateCompatibleDC(&dc);
        CBitmap *pOldImageBMP=ImageDC.SelectObject(&BackBMP);
        dc.StretchBlt(0,0,bm.bmWidth,bm.bmHeight,&ImageDC,0,0,bm.bmWidth,bm.bmHeight,SRCCOPY);//绘制底图
        ImageDC.SelectObject(pOldImageBMP);
////////////////////////////////////////////////////////END
        CDialog::OnPaint();
    }
}

// The system calls this to obtain the cursor to display while the user drags
//  the minimized window.
HCURSOR CEx_23Dlg::OnQueryDragIcon()
{
    return (HCURSOR) m_hIcon;
}

 

显示结果：