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Bridge Pattern - Bridging the gap between Interface and Implementation

, 8 Jan 2001
This article discusses the Bridge Pattern, what it is, why and when it is needed.
bridge.zip
Bridge.clw
Bridge.mak
Bridge.mdp
res
BridgeDoc.ico
Bridge.ico
Bridge.dsp
Bridge.opt
Bridge.dsw
Bridge.bmp
// Bridge.cpp : Defines the class behaviors for the application.
//

#include "stdafx.h"
#include "Bridge.h"

#include "MainFrm.h"
#include "BridgeDoc.h"
#include "BridgeView.h"

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

/////////////////////////////////////////////////////////////////////////////
// CBridgeApp

BEGIN_MESSAGE_MAP(CBridgeApp, CWinApp)
	//{{AFX_MSG_MAP(CBridgeApp)
	ON_COMMAND(ID_APP_ABOUT, OnAppAbout)
		// NOTE - the ClassWizard will add and remove mapping macros here.
		//    DO NOT EDIT what you see in these blocks of generated code!
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CBridgeApp construction

CBridgeApp::CBridgeApp()
{
	// TODO: add construction code here,
	// Place all significant initialization in InitInstance
}

/////////////////////////////////////////////////////////////////////////////
// The one and only CBridgeApp object

CBridgeApp theApp;

/////////////////////////////////////////////////////////////////////////////
// CBridgeApp initialization

BOOL CBridgeApp::InitInstance()
{
	// 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.

	LoadStdProfileSettings();  // Load standard INI file options (including MRU)

	// Register the application's document templates.  Document templates
	//  serve as the connection between documents, frame windows and views.

	CSingleDocTemplate* pDocTemplate;
	pDocTemplate = new CSingleDocTemplate(
		IDR_MAINFRAME,
		RUNTIME_CLASS(CBridgeDoc),
		RUNTIME_CLASS(CMainFrame),       // main SDI frame window
		RUNTIME_CLASS(CBridgeView));
	AddDocTemplate(pDocTemplate);

	// Parse command line for standard shell commands, DDE, file open
	CCommandLineInfo cmdInfo;
	ParseCommandLine(cmdInfo);

	// Dispatch commands specified on the command line
	if (!ProcessShellCommand(cmdInfo))
		return FALSE;

#ifdef _MAC
	// Enable drag/drop open.  We don't call this in Win32, since a
	//  document file extension wasn't chosen while running AppWizard.
	m_pMainWnd->DragAcceptFiles();
#endif

	return TRUE;
}

/////////////////////////////////////////////////////////////////////////////
// CAboutDlg dialog used for App About

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

// Dialog Data
	//{{AFX_DATA(CAboutDlg)
	enum { IDD = IDD_ABOUTBOX };
	//}}AFX_DATA

	// ClassWizard generated virtual function overrides
	//{{AFX_VIRTUAL(CAboutDlg)
	protected:
	virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV support
	//}}AFX_VIRTUAL

// Implementation
protected:
	//{{AFX_MSG(CAboutDlg)
		// No message handlers
	//}}AFX_MSG
	DECLARE_MESSAGE_MAP()
};

CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD)
{
	//{{AFX_DATA_INIT(CAboutDlg)
	//}}AFX_DATA_INIT
}

void CAboutDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CAboutDlg)
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)
	//{{AFX_MSG_MAP(CAboutDlg)
		// No message handlers
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

// App command to run the dialog
void CBridgeApp::OnAppAbout()
{
	CAboutDlg aboutDlg;
	aboutDlg.DoModal();
}

/////////////////////////////////////////////////////////////////////////////
// CBridgeApp commands

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About the Author

T. Kulathu Sarma

Switzerland Switzerland
Kulathu Sarma is working as a Technology Manager for GoldAvenue, a company based in Geneva, Switzerland and responsible for supporting e-business initiatives of GoldAvenue in B2B and B2C Sectors. He has been programming in C/C++ for 9 years and actively working on Patterns for the past 5 years.

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