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Applying Observer Pattern in C++ Applications

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8 Jan 2001 158.4K   2.1K   109  
This article explains how to avoid object dependencies using the Observer Pattern with a simple example.
//Microsoft Developer Studio generated resource script.
//
#include "resource.h"

#define APSTUDIO_READONLY_SYMBOLS
/////////////////////////////////////////////////////////////////////////////
//
// Generated from the TEXTINCLUDE 2 resource.
//
#include "afxres.h"

/////////////////////////////////////////////////////////////////////////////
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/////////////////////////////////////////////////////////////////////////////
// English (U.S.) resources

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1 TEXTINCLUDE DISCARDABLE 
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2 TEXTINCLUDE DISCARDABLE 
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3 TEXTINCLUDE DISCARDABLE 
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    "#define _AFX_NO_SPLITTER_RESOURCES\r\n"
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    "LANGUAGE 9, 1\r\n"
    "#pragma code_page(1252)\r\n"
    "#endif\r\n"
    "#include ""res\\Observer.rc2""  // non-Microsoft Visual C++ edited resources\r\n"
    "#include ""afxres.rc""         // Standard components\r\n"
    "#endif\0"
END

#endif    // APSTUDIO_INVOKED


/////////////////////////////////////////////////////////////////////////////
//
// Icon
//

// Icon with lowest ID value placed first to ensure application icon
// remains consistent on all systems.
IDR_MAINFRAME           ICON    DISCARDABLE     "res\\Observer.ico"

/////////////////////////////////////////////////////////////////////////////
//
// Dialog
//

IDD_ABOUTBOX DIALOG DISCARDABLE  0, 0, 217, 55
STYLE DS_MODALFRAME | WS_POPUP | WS_CAPTION | WS_SYSMENU
CAPTION "About Observer"
FONT 8, "MS Sans Serif"
BEGIN
    ICON            IDR_MAINFRAME,IDC_STATIC,11,17,20,20
    LTEXT           "Observer Version 1.0",IDC_STATIC,40,10,119,8,
                    SS_NOPREFIX
    LTEXT           "Copyright (C) 1999",IDC_STATIC,40,25,119,8
    DEFPUSHBUTTON   "OK",IDOK,178,7,32,14,WS_GROUP
END

IDD_MAIN_DIALOG DIALOGEX 0, 0, 150, 122
STYLE DS_MODALFRAME | WS_POPUP | WS_VISIBLE | WS_CAPTION | WS_SYSMENU
EXSTYLE WS_EX_APPWINDOW
CAPTION "SMS Fitness Center - Stair Master"
FONT 8, "MS Sans Serif"
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                    WS_TABSTOP
    DEFPUSHBUTTON   "Start",IDOK,20,96,50,14
    PUSHBUTTON      "Cancel",IDCANCEL,78,96,50,14
    LTEXT           "Age",IDC_STATIC,9,16,14,8
    LTEXT           "Duration (1-60 minutes)",IDC_STATIC,9,34,47,19
    LTEXT           "Program",IDC_STATIC,9,59,27,8
    LTEXT           "Level (1-12)",IDC_STATIC,9,80,38,8
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CAPTION "SMS Fitness Center - Stair Master"
FONT 8, "MS Sans Serif"
BEGIN
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    PUSHBUTTON      "Stop",IDSTOP,145,166,50,14
    PUSHBUTTON      "Close",IDCANCEL,205,166,50,14
END


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VS_VERSION_INFO VERSIONINFO
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#ifdef _DEBUG
 FILEFLAGS 0x1L
#else
 FILEFLAGS 0x0L
#endif
 FILEOS 0x4L
 FILETYPE 0x1L
 FILESUBTYPE 0x0L
BEGIN
    BLOCK "StringFileInfo"
    BEGIN
        BLOCK "040904B0"
        BEGIN
            VALUE "CompanyName", "\0"
            VALUE "FileDescription", "Observer MFC Application\0"
            VALUE "FileVersion", "1, 0, 0, 1\0"
            VALUE "InternalName", "Observer\0"
            VALUE "LegalCopyright", "Copyright (C) 1999\0"
            VALUE "LegalTrademarks", "\0"
            VALUE "OriginalFilename", "Observer.EXE\0"
            VALUE "ProductName", "Observer Application\0"
            VALUE "ProductVersion", "1, 0, 0, 1\0"
        END
    END
    BLOCK "VarFileInfo"
    BEGIN
        VALUE "Translation", 0x409, 1200
    END
END

#endif    // !_MAC


/////////////////////////////////////////////////////////////////////////////
//
// DESIGNINFO
//

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BEGIN
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        LEFTMARGIN, 7
        RIGHTMARGIN, 143
        TOPMARGIN, 7
        BOTTOMMARGIN, 115
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    IDD_STAIRMASTER, DIALOG
    BEGIN
        LEFTMARGIN, 7
        RIGHTMARGIN, 333
        TOPMARGIN, 7
        BOTTOMMARGIN, 178
    END
END
#endif    // APSTUDIO_INVOKED


/////////////////////////////////////////////////////////////////////////////
//
// String Table
//

STRINGTABLE DISCARDABLE 
BEGIN
    IDS_ABOUTBOX            "&About Observer..."
END

#endif    // English (U.S.) resources
/////////////////////////////////////////////////////////////////////////////



#ifndef APSTUDIO_INVOKED
/////////////////////////////////////////////////////////////////////////////
//
// Generated from the TEXTINCLUDE 3 resource.
//
#define _AFX_NO_SPLITTER_RESOURCES
#define _AFX_NO_OLE_RESOURCES
#define _AFX_NO_TRACKER_RESOURCES
#define _AFX_NO_PROPERTY_RESOURCES

#if !defined(AFX_RESOURCE_DLL) || defined(AFX_TARG_ENU)
#ifdef _WIN32
LANGUAGE 9, 1
#pragma code_page(1252)
#endif
#include "res\Observer.rc2"  // non-Microsoft Visual C++ edited resources
#include "afxres.rc"         // Standard components
#endif
/////////////////////////////////////////////////////////////////////////////
#endif    // not APSTUDIO_INVOKED

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Written By
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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