VC2010基于对话框使用GDI+显示图像

1.在项目属性中添加GDI+ 静态链接库：

   Project->Property->Linker->Input->Additional Dependencies 添加gdiplus.lib 使用。

2. 添加代码

   2.1 打开“解决方案资源管理器“，打开“stdafx.h”文件，在其中添加如下代码（添加到本文件的末尾）：

        #include "gdiplus.h"
        using namespace Gdiplus;       

// stdafx.h : include file for standard system include files,
// or project specific include files that are used frequently,
// but are changed infrequently

#pragma once

#ifndef _SECURE_ATL
#define _SECURE_ATL 1
#endif

#ifndef VC_EXTRALEAN
#define VC_EXTRALEAN            // Exclude rarely-used stuff from Windows headers
#endif

#include "targetver.h"

#define _ATL_CSTRING_EXPLICIT_CONSTRUCTORS      // some CString constructors will be explicit

// turns off MFC's hiding of some common and often safely ignored warning messages
#define _AFX_ALL_WARNINGS

#include <afxwin.h>         // MFC core and standard components
#include <afxext.h>         // MFC extensions


#include <afxdisp.h>        // MFC Automation classes



#ifndef _AFX_NO_OLE_SUPPORT
#include <afxdtctl.h>           // MFC support for Internet Explorer 4 Common Controls
#endif
#ifndef _AFX_NO_AFXCMN_SUPPORT
#include <afxcmn.h>             // MFC support for Windows Common Controls
#endif // _AFX_NO_AFXCMN_SUPPORT

#include <afxcontrolbars.h>     // MFC support for ribbons and control bars









#ifdef _UNICODE
#if defined _M_IX86
#pragma comment(linker,"/manifestdependency:\"type='win32' name='Microsoft.Windows.Common-Controls' version='6.0.0.0' processorArchitecture='x86' publicKeyToken='6595b64144ccf1df' language='*'\"")
#elif defined _M_X64
#pragma comment(linker,"/manifestdependency:\"type='win32' name='Microsoft.Windows.Common-Controls' version='6.0.0.0' processorArchitecture='amd64' publicKeyToken='6595b64144ccf1df' language='*'\"")
#else
#pragma comment(linker,"/manifestdependency:\"type='win32' name='Microsoft.Windows.Common-Controls' version='6.0.0.0' processorArchitecture='*' publicKeyToken='6595b64144ccf1df' language='*'\"")
#endif
#endif


#include "gdiplus.h"
using namespace Gdiplus;

2.2 打开“类视图”，选中应用程序类“C×××App”（×××是当前项目的名称），为其添加两个成员变量：
       GdiplusStartupInput m_GdiplusStartupInput;
       ULONG_PTR m_GdiplusToken;

       

// Gdipicture.h : main header file for the PROJECT_NAME application
//

#pragma once

#ifndef __AFXWIN_H__
    #error "include 'stdafx.h' before including this file for PCH"
#endif

#include "resource.h"        // main symbols


// CGdipictureApp:
// See Gdipicture.cpp for the implementation of this class
//

class CGdipictureApp : public CWinApp
{
public:
    CGdipictureApp();

// Overrides
public:
    virtual BOOL InitInstance();
    virtual BOOL ExitInstance();
    GdiplusStartupInput m_GdiplusStartupInput;
    ULONG_PTR m_GdiplusToken;
// Implementation

    DECLARE_MESSAGE_MAP()
};

extern CGdipictureApp theApp;

2.3 在C×××App类的InitInstance函数中添加如下代码：
      GdiplusStartup(&m_GdiplusToken,&m_GdiplusStartupInput,NULL);

     

// Gdipicture.cpp : Defines the class behaviors for the application.
//

#include "stdafx.h"
#include "Gdipicture.h"
#include "GdipictureDlg.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#endif


// CGdipictureApp

BEGIN_MESSAGE_MAP(CGdipictureApp, CWinApp)
    ON_COMMAND(ID_HELP, &CWinApp::OnHelp)
END_MESSAGE_MAP()


// CGdipictureApp construction

CGdipictureApp::CGdipictureApp()
{
    // support Restart Manager
    m_dwRestartManagerSupportFlags = AFX_RESTART_MANAGER_SUPPORT_RESTART;

    // TODO: add construction code here,
    // Place all significant initialization in InitInstance
}


// The one and only CGdipictureApp object

CGdipictureApp theApp;


// CGdipictureApp initialization

BOOL CGdipictureApp::InitInstance()
{
    // InitCommonControlsEx() is required on Windows XP if an application
    // manifest specifies use of ComCtl32.dll version 6 or later to enable
    // visual styles.  Otherwise, any window creation will fail.
    INITCOMMONCONTROLSEX InitCtrls;
    InitCtrls.dwSize = sizeof(InitCtrls);
    // Set this to include all the common control classes you want to use
    // in your application.
    InitCtrls.dwICC = ICC_WIN95_CLASSES;
    InitCommonControlsEx(&InitCtrls);

    GdiplusStartup(&m_GdiplusToken,&m_GdiplusStartupInput,NULL); 

    CWinApp::InitInstance();


    AfxEnableControlContainer();

    // Create the shell manager, in case the dialog contains
    // any shell tree view or shell list view controls.
    CShellManager *pShellManager = new CShellManager;

    // Standard initialization
    // If you are not using these features and wish to reduce the size
    // of your final executable, you should remove from the following
    // the specific initialization routines you do not need
    // Change the registry key under which our settings are stored
    // TODO: You should modify this string to be something appropriate
    // such as the name of your company or organization
    SetRegistryKey(_T("Local AppWizard-Generated Applications"));

    CGdipictureDlg dlg;
    m_pMainWnd = &dlg;
    INT_PTR nResponse = dlg.DoModal();
    if (nResponse == IDOK)
    {
        // TODO: Place code here to handle when the dialog is
        //  dismissed with OK
    }
    else if (nResponse == IDCANCEL)
    {
        // TODO: Place code here to handle when the dialog is
        //  dismissed with Cancel
    }

    // Delete the shell manager created above.
    if (pShellManager != NULL)
    {
        delete pShellManager;
    }

    

    // Since the dialog has been closed, return FALSE so that we exit the
    //  application, rather than start the application's message pump.
    return FALSE;
}

BOOL CGdipictureApp::ExitInstance()
{
    GdiplusShutdown(m_GdiplusToken);  
    return CWinApp::ExitInstance();  
}

2.4 重写C×××App类的ExitInstance函数，并添加如下代码：
      BOOL CGdipictureApp::ExitInstance()
     {
          GdiplusShutdown(m_GdiplusToken); 
           return CWinApp::ExitInstance(); 
      }

3.显示图像的函数

   

void CGdipictureDlg::DrawImg(CString c_path)  
{  
    Invalidate();//擦除上一次的图像  
    UpdateWindow();  
    int width,height;  
    float rate;//等比例缩小的比例参数  
    CDC* pDC=GetDC();  
    Graphics graph(pDC->GetSafeHdc());  
    //Image* image=Image::FromFile(c_path.AllocSysString());//c_path为图像的路径  
    Image* image=Image::FromFile(c_path);
    width=image->GetWidth();  
    height=image->GetHeight();  
    CRect rect;  
    GetClientRect(rect);  
    rate=(float)width/(float)height;//宽度和高度的比例  
    if(height>rect.Height())  
    {  

        graph.DrawImage(image,0,0,(int)(rate*rect.Height()),rect.Height());  
        ReleaseDC(pDC);  
    }  
    else  
    {  
        graph.DrawImage(image,0,0);  
        ReleaseDC(pDC);  
    }  

}  

 

// GdipictureDlg.cpp : implementation file
//

#include "stdafx.h"
#include "Gdipicture.h"
#include "GdipictureDlg.h"
#include "afxdialogex.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#endif


// CAboutDlg dialog used for App About

class CAboutDlg : public CDialogEx
{
public:
    CAboutDlg();

// Dialog Data
    enum { IDD = IDD_ABOUTBOX };

    protected:
    virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV support

// Implementation
protected:
    DECLARE_MESSAGE_MAP()
};

CAboutDlg::CAboutDlg() : CDialogEx(CAboutDlg::IDD)
{
}

void CAboutDlg::DoDataExchange(CDataExchange* pDX)
{
    CDialogEx::DoDataExchange(pDX);
}

BEGIN_MESSAGE_MAP(CAboutDlg, CDialogEx)
END_MESSAGE_MAP()


// CGdipictureDlg dialog




CGdipictureDlg::CGdipictureDlg(CWnd* pParent /*=NULL*/)
    : CDialogEx(CGdipictureDlg::IDD, pParent)
{
    m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CGdipictureDlg::DoDataExchange(CDataExchange* pDX)
{
    CDialogEx::DoDataExchange(pDX);
}

BEGIN_MESSAGE_MAP(CGdipictureDlg, CDialogEx)
    ON_WM_SYSCOMMAND()
    ON_WM_PAINT()
    ON_WM_QUERYDRAGICON()
    ON_BN_CLICKED(IDC_BUTTON1, &CGdipictureDlg::OnBnClickedButton1)
    ON_BN_CLICKED(IDC_BUTTON2, &CGdipictureDlg::OnBnClickedButton2)
END_MESSAGE_MAP()


// CGdipictureDlg message handlers

BOOL CGdipictureDlg::OnInitDialog()
{
    CDialogEx::OnInitDialog();

    // Add "About..." menu item to system menu.

    // IDM_ABOUTBOX must be in the system command range.
    ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);
    ASSERT(IDM_ABOUTBOX < 0xF000);

    CMenu* pSysMenu = GetSystemMenu(FALSE);
    if (pSysMenu != NULL)
    {
        BOOL bNameValid;
        CString strAboutMenu;
        bNameValid = strAboutMenu.LoadString(IDS_ABOUTBOX);
        ASSERT(bNameValid);
        if (!strAboutMenu.IsEmpty())
        {
            pSysMenu->AppendMenu(MF_SEPARATOR);
            pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);
        }
    }

    // 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
}

void CGdipictureDlg::OnSysCommand(UINT nID, LPARAM lParam)
{
    if ((nID & 0xFFF0) == IDM_ABOUTBOX)
    {
        CAboutDlg dlgAbout;
        dlgAbout.DoModal();
    }
    else
    {
        CDialogEx::OnSysCommand(nID, lParam);
    }
}

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

        SendMessage(WM_ICONERASEBKGND, reinterpret_cast<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
    {
        CDialogEx::OnPaint();
    }
}

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



void CGdipictureDlg::OnBnClickedButton1()
{
    // TODO: Add your control notification handler code here
DrawImg(_T("E:\\MyCode\\MyOpenCVHelper\\Image\\lena.png"));
}
void CGdipictureDlg::DrawImg(CString c_path)  
{  
    Invalidate();//擦除上一次的图像  
    UpdateWindow();  
    int width,height;  
    float rate;//等比例缩小的比例参数  
    CDC* pDC=GetDC();  
    Graphics graph(pDC->GetSafeHdc());  
    //Image* image=Image::FromFile(c_path.AllocSysString());//c_path为图像的路径  
    Image* image=Image::FromFile(c_path);
    width=image->GetWidth();  
    height=image->GetHeight();  
    CRect rect;  
    GetClientRect(rect);  
    rate=(float)width/(float)height;//宽度和高度的比例  
    if(height>rect.Height())  
    {  

        graph.DrawImage(image,0,0,(int)(rate*rect.Height()),rect.Height());  
        ReleaseDC(pDC);  
    }  
    else  
    {  
        graph.DrawImage(image,0,0);  
        ReleaseDC(pDC);  
    }  

}  


void CGdipictureDlg::OnBnClickedButton2()
{
    // TODO: Add your control notification handler code here

    //// Create two images.
    //Image* image1 = Image::FromFile( _T("E:\\MyCode\\MyOpenCVHelper\\Image\\HappyFish.jpg") );
    //Image* image2 = Image::FromFile( _T("E:\\MyCode\\MyOpenCVHelper\\Image\\HappyFish.jpg") );

    //// Get a PropertyItem from image1.
    //PropertyItem* propItem = image1->GetPropertyItem( 20624 );

    //// Change the ID of the PropertyItem.
    //propItem->Id = 20625;

    //// Set the PropertyItem for image2.
    //image2->SetPropertyItem( propItem );

    //// Draw the image.
    //e->Graphics->DrawImage( image2, 20.0F, 20.0F );


}

通过上述方法我们可以显示任何一种格式的图像，并且可以等比例调整图像的大小，保证图像不变形。

  

  参考原文：http://blog.csdn.net/tanghuachun/article/details/6603725